Carbon capture and storage
Carbon capture and storage (CCS) (or carbon capture and sequestration or carbon control and sequestration) is the process of capturing waste carbon dioxide (CO2) from large point sources, such as fossil fuel power plants, transporting it to a storage site, and depositing it where it will not enter the atmosphere, normally an underground geological formation. The aim is to prevent the release of large quantities of CO2 into the atmosphere (from fossil fuel use in power generation and other industries). It is a potential means of mitigating the contribution of fossil fuel emissions to global warming and ocean acidification. Although CO2 has been injected into geological formations for several decades for various purposes, including enhanced oil recovery, the long term storage of CO2 is a relatively new concept. The first commercial example was the Weyburn-Midale Carbon Dioxide Project in 2000. Other examples include SaskPower's Boundary Dam and Mississippi Power's Kemper Project. 'CCS' can also be used to describe the scrubbing of CO2 from ambient air as a climate engineering technique.
An integrated pilot-scale CCS power plant was to begin operating in September 2008 in the eastern German power plant Schwarze Pumpe run by utility Vattenfall, to test the technological feasibility and economic efficiency. CCS applied to a modern conventional power plant could reduce CO2 emissions to the atmosphere by approximately 80–90% compared to a plant without CCS. The IPCC estimates that the economic potential of CCS could be between 10% and 55% of the total carbon mitigation effort until year 2100.
Carbon dioxide can be captured out of air or fossil fuel power plant flue gas using adsorption (or carbon scrubbing), membrane gas separation, or adsorption technologies. Amines are the leading carbon scrubbing technology. Capturing and compressing CO2 may increase the energy needs of a coal-fired CCS plant by 25–40%. These and other system costs are estimated to increase the cost per watt-hour energy produced by 21–91% for fossil fuel power plants. Applying the technology to existing plants would be more expensive, especially if they are far from a sequestration site. A 2005 industry report suggests that with successful research, development and deployment (RD&D), sequestered coal-based electricity generation in 2025 may cost less than unsequestered coal-based electricity generation today.
Storage of the CO2 is envisaged either in deep geological formations, or in the form of mineral carbonates. Deep ocean storage is not currently considered feasible due to the associated effect of ocean acidification. Geological formations are currently considered the most promising sequestration sites. The National Energy Technology Laboratory (NETL) reported that North America has enough storage capacity for more than 900 years worth of carbon dioxide at current production rates. A general problem is that long term predictions about submarine or underground storage security are very difficult and uncertain, and there is still the risk that CO2 might leak into the atmosphere.
Capturing CO2 is most effective at point sources, such as large fossil fuel or biomass energy facilities, industries with major CO2 emissions, natural gas processing, synthetic fuel plants and fossil fuel-based hydrogen production plants. Extracting CO2 from air is also possible, but not very practical because the CO2 is not concentrated.
Flue gas from the combustion of coal in oxygen has a large concentration of CO2, about 10-15% CO2 whereas natural gas power plant flue gas is about 5–10% CO2. Therefore, it is more energy and cost efficient to capture CO2 from coal-fired power plants. Impurities in CO2 streams, like sulfurs and water, could have a significant effect on their phase behaviour and could pose a significant threat of increased corrosion of pipeline and well materials. In instances where CO2 impurities exist, especially with air capture, a scrubbing separation process would be needed to initially clean the flue gas. According to the Wallula Energy Resource Center in Washington state, by gasifying coal, it is possible to capture approximately 65% of carbon dioxide embedded in it and sequester it in a solid form.
Broadly, three different configurations of technologies for capture exist: post-combustion, pre-combustion, and oxyfuel combustion:
- In post combustion capture, the CO2 is removed after combustion of the fossil fuel — this is the scheme that would be applied to fossil-fuel burning power plants. Here, carbon dioxide is captured from flue gases at power stations or other large point sources. The technology is well understood and is currently used in other industrial applications, although not at the same scale as might be required in a commercial scale power station. Post combustion capture is most popular in research because existing fossil fuel power plants can be retrofitted to include CCS technology in this configuration.
- The technology for pre-combustion is widely applied in fertilizer, chemical, gaseous fuel (H2, CH4), and power production. In these cases, the fossil fuel is partially oxidized, for instance in a gasifier. The resulting syngas (CO and H2) is shifted into CO2 and H2. The resulting CO2 can be captured from a relatively pure exhaust stream. The H2 can now be used as fuel; the carbon dioxide is removed before combustion takes place. There are several advantages and disadvantages when compared to conventional post combustion carbon dioxide capture. The CO2 is removed after combustion of fossil fuels, but before the flue gas is expanded to atmospheric pressure. This scheme is applied to new fossil fuel burning power plants, or to existing plants where re-powering is an option. The capture before expansion, i.e. from pressurized gas, is standard in almost all industrial CO2 capture processes, at the same scale as will be required for utility power plants.
- In oxy-fuel combustion the fuel is burned in oxygen instead of air. To limit the resulting flame temperatures to levels common during conventional combustion, cooled flue gas is recirculated and injected into the combustion chamber. The flue gas consists of mainly carbon dioxide and water vapour, the latter of which is condensed through cooling. The result is an almost pure carbon dioxide stream that can be transported to the sequestration site and stored. Power plant processes based on oxyfuel combustion are sometimes referred to as "zero emission" cycles, because the CO2 stored is not a fraction removed from the flue gas stream (as in the cases of pre- and post-combustion capture) but the flue gas stream itself. A certain fraction of the CO2 generated during combustion will inevitably end up in the condensed water. To warrant the label "zero emission" the water would thus have to be treated or disposed of appropriately. The technique is promising, but the initial air separation step demands a lot of energy.
CO2 separation technologiesEdit
Carbon dioxide can be separated out of air or flue gas with absorption, adsorption, or membrane gas separation technologies. Absorption, or carbon scrubbing, with amines is currently the dominant capture technology. Membrane and adsorption technologies are still in the developmental research stages, initiating primary pilot plants in the near future. Metal-Organic Frameworks (MOFs) are a novel class of materials that offer promise for carbon capture using adsorption technologies.
Carbon dioxide adsorbs to a MOF through physisorption or chemisorption based on the porosity and selectivity of the MOF leaving behind a Greenhouse gas poor gas stream that is more environmentally friendly. The carbon dioxide is then stripped off the MOF using temperature swing adsorption (TSA) or pressure swing adsorption (PSA) so the MOF can be reused. Adsorbents and absorbents require regeneration steps where the CO2 is removed from the sorbent or solution that collected it out of the flue gas in order for the sorbent or solution to be reused. Monoethanolamine (MEA) solutions, the leading amine for capturing CO2, have a heat capacity between 3-4 J/g K since they are mostly water. Higher heat capacities add to the energy penalty in the solvent regeneration step. Thus, to optimize a MOF for carbon capture, low heat capacities and heats of adsorption are desired. Additionally, high working capacity and high selectivity are desirable in order to capture as much CO2 as possible from the flue gas. However, there is an energy trade off with selectivity and energy expenditure. As the amount of CO2 captured increases, the energy, and therefore cost, required to regenerate increases. A large drawback of using MOFs for CCS is the limitations imposed by their chemical and thermal stability. Current research is looking to optimize MOF properties for CCS, but it has proven difficult to find these optimizations that also result in a stable MOF. Metal reservoirs are also a limiting factor to the potential success of MOFs.
Capture is attributed to about two thirds of the total cost of CCS, making it limit the wide-scale deployment of CCS technologies. To optimize a CO2 capture process would significantly increase the feasibility of CCS since the transport and storage steps of CCS are rather mature technologies.
An alternate method under development is chemical looping combustion (CLC). Chemical looping uses a metal oxide as a solid oxygen carrier. Metal oxide particles react with a solid, liquid or gaseous fuel in a fluidized bed combustor, producing solid metal particles and a mixture of carbon dioxide and water vapor. The water vapor is condensed, leaving pure carbon dioxide, which can then be sequestered. The solid metal particles are circulated to another fluidized bed where they react with air, producing heat and regenerating metal oxide particles that are recirculated to the fluidized bed combustor. A variant of chemical looping is calcium looping, which uses the alternating carbonation and then calcination of a calcium oxide based carrier as a means of capturing CO2.
Direct air captureEdit
Direct air capture refers to the process of removing CO2 directly from the ambient air (as opposed to from point sources). Combining direct air capture with carbon storage could act as a carbon dioxide removal technology and as such would constitute a form of climate engineering if deployed at large scale.
Among the specific chemical processes that are being explored, three stand out: causticization with alkali and alkali-earth hydroxides, carbonation, and organic−inorganic hybrid sorbents consisting of amines supported in porous adsorbents.
Given that CO2 in the atmosphere is highly diluted compared to point-source CO2 capture, capture costs are estimated to be higher. Once costs and incentives for climate change mitigation rise higher later this century, however, they might become attractive for dealing with emissions from diffuse sources such as automobiles and aircraft. Global Research Technologies demonstrated a pre-prototype of air capture technology in 2007.
After capture, the CO2 would have to be transported to suitable storage sites. This would most likely be done by pipeline, which is generally the cheapest form of transport. In 2008, there were approximately 5,800 km of CO2 pipelines in the United States, used to transport CO2 to oil production fields where it is then injected into older fields to extract oil. The injection of CO2 to produce oil is generally called enhanced oil recovery. In addition, there are several pilot programs in various stages to test the long-term storage of CO2 in non-oil producing geologic formations.
According to the Congressional Research Service, "There are important unanswered questions about pipeline network requirements, economic regulation, utility cost recovery, regulatory classification of CO2 itself, and pipeline safety. Furthermore, because CO2 pipelines for enhanced oil recovery are already in use today, policy decisions affecting CO2 pipelines take on an urgency that is unrecognized by many. Federal classification of CO2 as both a commodity (by the Bureau of Land Management) and as a pollutant (by the Environmental Protection Agency) could potentially create an immediate conflict which may need to be addressed not only for the sake of future CCS implementation, but also to ensure consistency of future CCS with CO2 pipeline operations today."
Ships could also be utilized for transport where pipelines are not feasible. These methods are currently used for transporting CO2 for other applications.
Various forms have been conceived for permanent storage of CO2. These forms include gaseous storage in various deep geological formations (including saline formations and exhausted gas fields), and solid storage by reaction of CO2 with metal oxides to produce stable carbonates.
Also known as geo-sequestration, this method involves injecting carbon dioxide, generally in supercritical form, directly into underground geological formations. Oil fields, gas fields, saline formations, unmineable coal seams, and saline-filled basalt formations have been suggested as storage sites. Various physical (e.g., highly impermeable caprock) and geochemical trapping mechanisms would prevent the CO2 from escaping to the surface.
CO2 is sometimes injected into declining oil fields to increase oil recovery. Approximately 30 to 50 million metric tonnes of CO2 are injected annually in the United States into declining oil fields. This option is attractive because the geology of hydrocarbon reservoirs is generally well understood and storage costs may be partly offset by the sale of additional oil that is recovered. Disadvantages of old oil fields are their geographic distribution and their limited capacity, as well as the fact that subsequent burning of the additional oil recovered will offset much or all of the reduction in CO2 emissions.
Unmineable coal seams can be used to store CO2 because the CO2 molecules attach to the surface of coal. The technical feasibility, however, depends on the permeability of the coal bed. In the process of absorption the coal releases previously absorbed methane, and the methane can be recovered (enhanced coal bed methane recovery). The sale of the methane can be used to offset a portion of the cost of the CO2 storage. Burning the resultant methane, however, would negate some of the benefit of sequestering the original CO2.
Saline formations contain highly mineralized brines, and have so far been considered of no benefit to humans. Saline aquifers have been used for storage of chemical waste in a few cases. The main advantage of saline aquifers is their large potential storage volume and their common occurrence. The major disadvantage of saline aquifers is that relatively little is known about them, especially compared to oil fields. To keep the cost of storage acceptable, the geophysical exploration may be limited, resulting in larger uncertainty about the aquifer structure. Unlike storage in oil fields or coal beds, no side product will offset the storage cost. Leakage of CO2 back into the atmosphere may be a problem in saline aquifer storage. Current research shows, however, that trapping mechanisms such as structural trapping, residual trapping, solubility trapping and mineral trapping could immobilize the CO2 underground and reduce the risk of leakage.
Enhanced oil recoveryEdit
Enhanced oil recovery (EOR) is a generic term for techniques used to increase the amount of crude oil that can be extracted from an oil field. In carbon capture and sequestration enhanced oil recovery (CCS EOR), carbon dioxide is injected into an oil field to recover oil that is often never recovered using more traditional methods.
Crude oil development and production in U.S. oil reservoirs can include up to three distinct phases: primary, secondary, and tertiary (or enhanced) recovery. During primary recovery only about 10 percent of a reservoir's original oil in place is typically produced. Secondary recovery techniques extend a field's productive life generally by injecting water or gas to displace oil and drive it to a production wellbore, resulting in the recovery of 20 to 40 percent of the original oil in place. However, with much of the easy-to-produce oil already recovered from U.S. oil fields, producers have attempted several tertiary, or enhanced oil recovery, techniques that offer prospects for ultimately producing 30 to 60 percent, or more, of the reservoir's original oil in place.
An example of a project that will use CCS EOR is the Kemper Project in Mississippi. Due to the Kemper Project's close proximity to oil fields, the carbon dioxide byproduct from producing electricity will be transported to the neighboring oil fields for enhanced oil recovery.
Framework Convention On Climate ChangeEdit
Held in 1992, the results from this climate convention are the most widely agreed upon for addressing the problem of climate change and the use of sinks of greenhouse gases. Ocean storage of CO2 has been pointed out a viable option of mitigating the levels of carbon dioxide in the atmosphere. However, the convention also states that there should be precautionary measures taken to mitigate any detriments to the environment. Therefore, with this convention, ocean storage may prove to be a way to store carbon dioxide efficiently, especially in places where it is cost effective such as Norway.
Taken place in 1972 with more than 70 members, the result of the London Convention is that it prohibits all ocean dumping without the direct approval of a national authority. In 1991, an addendum also prohibited the dumping of all radioactive and industrial waste, making it unclear and debated to today whether or not carbon dioxide falls under industrial waste. The London Convention also applies to sea-faring vessels such as ships, planes, and offshore drilling platforms. If these types of vessels want to dump carbon dioxide into the ocean, they must get permission from their respective national authority.
The 1996 Protocol to the London Convention went even further by prohibiting carbon dioxide storage that comes from sea-based storage. In 1997, the Joint Group of Experts on the Scientific Aspects of Marine environmental Protection stated that until there was 2/3 majority vote, any dumping of carbon dioxide from ships was in direct violation of the London Convention.
Also occurring in 1992, this convention was set up to protect the North East Atlantic Ocean. The convention was more certain in its results from the meeting. The first is that it prohibited carbon dioxide from going to a storage site through a petroleum platform and also prohibited transport by ship. It did however, allow transport of carbon dioxide through a pipeline from land to a site that did not require the use of a platform used for gas exploration.
In the past, it was suggested that CO2 could be stored in the oceans, but this would only exacerbate ocean acidification and has been made illegal under specific regulations. Ocean storage is no longer considered feasible.
In this process, CO2 is exothermically reacted with available metal oxides, which in turn produces stable carbonates (e.g. calcite, magnesite). This process occurs naturally over many years and is responsible for a great amount of surface limestone. The idea of using olivine has been promoted by the geochemist Prof. Schuiling. The reaction rate can be made faster, for example, with a catalyst or by reacting at higher temperatures and/or pressures, or by pre-treatment of the minerals, although this method can require additional energy. The IPCC estimates that a power plant equipped with CCS using mineral storage will need 60–180% more energy than a power plant without CCS.
The economics of mineral carbonation at scale are now being tested in a world-first pilot plant project based in Newcastle, Australia. New techniques for mineral activation and reaction have been developed the GreenMag Group and the University of Newcastle and funded by the New South Wales and Australian Governments to be operational by 2013.
In 2009 it was reported that scientists had mapped 6,000 square miles (16,000 km2) of rock formations in the U.S. that could be used to store 500 years' worth of U.S. carbon dioxide emissions. A study on mineral sequestration in the US states:
Carbon sequestration by reacting naturally occurring Mg and Ca containing minerals with CO2 to form carbonates has many unique advantages. Most notabl[e] is the fact that carbonates have a lower energy state than CO2, which is why mineral carbonation is thermodynamically favorable and occurs naturally (e.g., the weathering of rock over geologic time periods). Secondly, the raw materials such as magnesium based minerals are abundant. Finally, the produced carbonates are unarguably stable and thus re-release of CO2 into the atmosphere is not an issue. However, conventional carbonation pathways are slow under ambient temperatures and pressures. The significant challenge being addressed by this effort is to identify an industrially and environmentally viable carbonation route that will allow mineral sequestration to be implemented with acceptable economics.
|Earthen Oxide||Percent of Crust||Carbonate||Enthalpy change (kJ/mol)|
Ultramafic mine tailings are a readily available source of fine-grained metal oxides that can act as artificial carbon sinks to reduce net greenhouse gas emissions in the mining industry. Accelerating passive CO2 sequestration via mineral carbonation may be achieved through microbial processes that enhance mineral dissolution and carbonate precipitation.
The energy requirements of sequestration processes may be significant. In one paper, sequestration consumed 25 percent of the plant's rated 600-megawatt output capacity.
- After adding CO2 capture and compression, the capacity of the coal-fired power plant is reduced to 457 MW.
A major concern with CCS is whether leakage of stored CO2 will compromise CCS as a climate change mitigation option. For well-selected, designed and managed geological storage sites, IPCC estimates that risks are comparable to those associated with current hydrocarbon activity. However, this finding is contested due to a lack of experience in such long term storage. CO2 could be trapped for millions of years, and although some leakage occurs upwards through the soil, well selected storage sites are likely to retain over 99% of the injected CO2 over 1000 years. Leakage through the injection pipe is a greater risk.
Although the injection pipe is usually protected with non-return valves to prevent release on a power outage, there is still a risk that the pipe itself could tear and leak due to the pressure. The Berkel en Rodenrijs incident in December 2008 was an example, where a modest release of CO2 from a pipeline under a bridge resulted in the deaths of some ducks sheltering there. In order to measure accidental carbon releases more accurately and decrease the risk of fatalities through this type of leakage, the implementation of CO2 alert meters around the project perimeter has been proposed. Malfunction of a carbon dioxide industrial fire suppression system in a large warehouse released CO2 and 14 citizens collapsed on the nearby public road. A release of CO2 from a salt mine killed a person at distance of 300 meters.
In 1986 a large leakage of naturally sequestered CO2 rose from Lake Nyos in Cameroon and asphyxiated 1,700 people. While the carbon had been sequestered naturally, some point to the event as evidence for the potentially catastrophic effects of sequestering carbon artificially. The Lake Nyos disaster resulted from a volcanic event, which very suddenly released as much as a cubic kilometre of CO2 gas from a pool of naturally occurring CO2 under the lake in a deep narrow valley. The location of this pool of CO2 is not a place where man can inject or store CO2, and this pool was not known about nor monitored until after the occurrence of the natural disaster.
For ocean storage, the retention of CO2 would depend on the depth. The IPCC estimates 30–85% of the sequestered carbon dioxide would be retained after 500 years for depths 1000–3000 m. Mineral storage is not regarded as having any risks of leakage. The IPCC recommends that limits be set to the amount of leakage that can take place. This might rule out deep ocean storage as an option.
At the conditions of the deeper oceans, (about 400 bar or 40 MPa, 280 K) water–CO2(l) mixing is very low (where carbonate formation/acidification is the rate limiting step), but the formation of water-CO2 hydrates, a kind of solid water cage that surrounds the CO2, is favorable.
To further investigate the safety of CO2 sequestration, Norway's Sleipner gas field can be studied, as it is the oldest plant that stores CO2 on an industrial scale. According to an environmental assessment of the gas field which was conducted after ten years of operation, the author affirmed that geosequestration of CO2 was the most definite form of permanent geological storage of CO2:
Available geological information shows absence of major tectonic events after the deposition of the Utsira formation [saline reservoir]. This implies that the geological environment is tectonically stable and a site suitable for carbon dioxide storage. The solubility trapping [is] the most permanent and secure form of geological storage.
In March 2009 StatoilHydro issued a study showing the slow spread of CO2 in the formation after more than 10 years operation.
Phase I of the Weyburn-Midale Carbon Dioxide Project in Weyburn, Saskatchewan, Canada has determined that the likelihood of stored CO2 release is less than one percent in 5,000 years. A January 2011 report, however, claimed evidence of leakage in land above that project. This report was strongly refuted by the IEAGHG Weyburn-Midale CO2 Monitoring and Storage Project, which issued an eight-page analysis of the study, claiming that it showed no evidence of leakage from the reservoir.
The liability of potential leak(s) is one of the largest barriers to large-scale CCS. To assess and reduce such liability, the leakage of stored gasses, particularly carbon dioxide, into the atmosphere may be detected via atmospheric gas monitoring, and can be quantified directly via the eddy covariance flux measurements,
Monitoring geological sequestration sitesEdit
In order to detect carbon dioxide leaks and the effectiveness of geological sequestration sites, different monitoring techniques can be employed to verify that the sequestered carbon stays trapped below the surface in the intended reservoir. Leakage due to injection at improper locations or conditions could result in carbon dioxide being released back into the atmosphere. It is important to be able to detect leaks with enough warning to put a stop to it, and to be able to quantify the amount of carbon that has leaked for purposes such as cap and trade policies, evaluation of environmental impact of leaked carbon, as well as accounting for the total loss and cost of the process. To quantify the amount of carbon dioxide released, should a leak occur, or to closely watch stored CO2, there are several monitoring methods that can be done at both the surface and subsurface levels.
In subsurface monitoring, there are direct and indirect methods to determine the amount of CO2 in the reservoir. A direct method would be drilling deep enough to collect a fluid sample. This drilling can be difficult and expensive due to the physical properties of the rock. It also only provides data at a specific location. Indirect methods would be to send sound or electromagnetic waves down to the reservoir where it is then reflected back up to be interpreted. This approach is also expensive but it provides data over a much larger region; it does however lack precision. Both direct and indirect monitoring can be done intermittently or continuously.
Seismic monitoring is a type of indirect subsurface monitoring. It is done by creating vibrational waves either at the surface using a vibroseis truck, or inside a well using spinning eccentric mass. These vibrational waves then propagate through the geological layers and reflect back creating patterns that are read and interpreted by seismometers. It can identify migration pathways of the CO2 plume. Two examples of monitoring geological sequestration sites using seismic monitoring are the Sleipner sequestration project and the Frio CO2 Injection test. Although this method can confirm the presence of CO2 in a given region, it cannot determine the specifics of the environment or concentration of CO2.
Eddy covariance is a surface monitoring technique that measures the flux of CO2 from the ground's surface. It involves measuring CO2 concentrations as well as vertical wind velocities using an anemometer. This provides a measure of the total vertical flux of CO2. Eddy covariance towers could potentially detect leaks, however, the natural carbon cycle, such as photosynthesis and the respiration of plants, would have to be accounted for and a baseline CO2 cycle would have to be developed for the location of monitoring. An example of Eddy covariance techniques used to monitor carbon sequestration sites is the Shallow Release test. Another similar approach is utilizing accumulation chambers. These chambers are sealed to the ground with an inlet and outlet flow stream connected to a gas analyzer. This also measures the vertical flux of CO2. The disadvantage of accumulation chambers is its inability to monitor a large region which is necessary in detecting CO2 leaks over the entire sequestration site.
InSAR monitoring is another type of surface monitoring. It involves a satellite sending signals down to the Earth's surface where it is reflected back to the satellite's receiver. From this, the satellite is able to measure the distance to that point. In CCS, the injection of CO2 in deep sublayers of geological sites creates high pressures. These high pressured, fluid filled layers affect those above and below it resulting in a change of the surface landscape. In areas of stored CO2, the ground's surface often rises due to the high pressures originating in the deep subsurface layers. These changes in elevation of the Earth's surface corresponds to a change in the distance from the inSAR satellite which is then detectable and measurable.
Carbon capture and utilization (CCU)Edit
Carbon capture and use may offer a response to the global challenge of significantly reducing greenhouse gas emissions from major stationary (industrial) emitters in the near to medium term,. Given that it does not result in geological storage of carbon dioxide, it represents a different technological category from CCS. Technologies under development, such as Bio CCS Algal Synthesis, utilises pre-smokestack CO2 (such as from a coal-fired power station) as a useful feedstock input to the production of oil-rich algae in solar membranes to produce oil for plastics and transport fuel (including aviation fuel), and nutritious stock-feed for farm animal production. The CO2 and other captured greenhouse gases are injected into the membranes containing waste water and select strains of algae causing, together with sunlight or UV light, an oil rich biomass that doubles in mass every 24 hours.
The Bio CCS Algal Synthesis process is based on earth science photosynthesis: the technology is entirely retrofittable and collocated with the emitter, and the capital outlays may offer a return upon investment due to the high value commodities produced (oil for plastics, fuel and feed).
Bio CCS Algal Synthesis test facilities were being trialed at Australia's three largest coal-fired power stations (Tarong, Queensland; Eraring, NSW; Loy Yang, Victoria) using piped pre-emission smokestack CO2 (and other greenhouse gases) as feedstock to grow oil-rich algal biomass in enclosed membranes for the production of plastics, transport fuel and nutritious animal feed.
Another potentially useful way of dealing with industrial sources of CO2 is to convert it into hydrocarbons where it can be stored or reused as fuel or to make plastics. There are a number of projects investigating this possibility.
Carbon dioxide scrubbing variants exist based on potassium carbonate which can be used to create liquid fuels, though this process requires a great deal of energy input. Although the creation of fuel from atmospheric CO2 does not result in carbon dioxide removal as carbon dioxide is re-released when the fuel is burned. Therefore, synfuels do not represent a climate engineering technique. Nevertheless, they are potentially useful as net-zero-carbon fuel.
Single step methods: methanolEdit
Single step methods: hydrocarbonsEdit
At the department of Industrial Chemistry and Engineering of Materials at the University of Messina, Italy, there is a project to develop a system which works like a fuel-cell in reverse, whereby a catalyst is used that enables sunlight to split water into hydrogen ions and oxygen gas. The ions cross a membrane where they react with the CO2 to create hydrocarbons.
Two step methodsEdit
If CO2 is heated to 2400 °C, it splits into carbon monoxide (CO) and oxygen. The Fischer-Tropsch process can then be used to convert the CO into hydrocarbons. The required temperature can be achieved by using a chamber containing a mirror to focus sunlight on the gas. Rival teams are developing such chambers, at Solarec and at Sandia National Laboratories, both based in New Mexico. According to Sandia these chambers could provide enough fuel to power 100% of domestic vehicles using 5800 km2; unlike biofuels this would not take fertile land away from crops but would be land that is not being used for anything else. James May, the British TV presenter, visited a demonstration plant in a programme in his Big Ideas series.
Example CCS projectsEdit
As of September 2012, the Global CCS Institute identified 75 large-scale integrated projects in its 2012 Global Status of CCS report which is a net increase of one project since its 2011 Global Status of CCS report. 16 of these projects are in operation or in construction capturing around 36 million tonnes of CO2 per annum. For more information see Integrated CCS Projects on the Global CCS Institute's website. For information on EU projects see Zero Emissions Platform website. The eight large-scale integrated CCS projects currently in operation are:
In Salah is a fully operational onshore gas field with CO2 injection. CO2 is separated from produced gas and reinjected in the producing hydrocarbon reservoir zones. Since 2004, about 1 Mt/a of CO2 has been captured during natural gas extraction and injected into the Krechba geologic formation at a depth of 1,800m. The Krechba formation is expected to store 17Mt CO2 over the life of the project.
Injection suspended in 2011 due to concerns about the integrity of the seal.
Sleipner CO2 Injection — NorwayEdit
Sleipner is a fully operational offshore gas field with CO2 injection initiated in 1996. CO2 is separated from produced gas and reinjected in the Utsira saline aquifer (800–1000 m below ocean floor) above the hydrocarbon reservoir zones. This aquifer extends much further north from the Sleipner facility at its southern extreme. The large size of the reservoir accounts for why 600 billion tonnes of CO2 are expected to be stored, long after the Sleipner natural gas project has ended.
Snøhvit CO2 Injection — NorwayEdit
Snøhvit is a fully operational offshore gas field with CO2 injection. The LNG plant is located onshore. CO2 is necessarily separated to produce liquefied natural gas (LNG) and then CO2 is injected in a saline aquifer below the hydrocarbon reservoir zones offshore at a rate of 700,000 t/a into the Tubåen sandstone formation 2,600 m under the seabed for storage. This formation was closed April 2011, and injection started in the Stø-formation where produced gas is taken. Produced CO2 is increasing, therefore separation capacity may limit production before end 2015 when a new formation will be drilled for CO2-injection only. (Teknisk Ukeblad nr. 30, 2013, tu.no)
Great Plains Synfuel Plant and Weyburn-Midale Project — CanadaEdit
Weyburn-Midale is a coal gasification operation that produces synthetic natural gas and various petrochemicals from coal. This project captures about 2.8 Mt/a of CO2 from its coal gasification plant located in North Dakota, US, transported by pipeline 320 km across the Canada–US border and injects it into depleting oil fields in Saskatchewan where it is used for enhanced oil recovery (EOR).
Shute Creek Gas Processing Facility — USEdit
Around 7 million tonnes per annum of carbon dioxide are recovered from ExxonMobil's Shute Creek gas processing plant in Wyoming, and transported by pipeline to various oil fields for enhanced oil recovery. This project has been operational since 1986.
Enid Fertilizer — USEdit
The Enid Fertilizer plant sends 675,000 tonnes of CO2 to be used for EOR. The pipeline and wells are operated separately by Anadarko Petroleum.
Val Verde Natural Gas Plants — USEdit
CO2 from Mitchell, Gray Ranch, Puckett, and Turrell gas processing plants is transported via the Val Verde and CRC pipelines[where?] for EOR (incl. Sharon Ridge[clarification needed] EOR field).
Century Plant — USEdit
Occidental Petroleum, along with Sandridge Energy, is operating a West Texas hydrocarbon gas processing plant and related pipeline infrastructure that provides CO2 for use in EOR. With a total CO2 capture capacity of 8.5 Mt/a expected in 2012, the Century plant would be the largest single industrial source CO2 capture facility in North America.
Duke Energy East Bend Station — USEdit
Researchers at the Center for Applied Energy Research of the University of Kentucky are currently developing the algae-mediated conversion of coal-fired power plant flue gas to drop-in hydrocarbon fuels. Through their work, these researchers have proven that the carbon dioxide within flue gas from coal-fired power plants can be captured using algae, which can be subsequently harvested and utilized, e.g. as a feedstock for the production of drop-in hydrocarbon fuels.
Petra Nova — USEdit
The Petra Nova project is a billion dollar endeavour taken upon by NRG Energy and JP Nippon to retrofit their jointly owned W.A Parish coal-fired power plant with post-combustion carbon capture. The plant, which is located in Thompsons, Texas (just outside of Houston), entered commercial service in 1977, and carbon capture began operation on January 10, 2017. The plant generates 240 MW and 90% of the CO2 (or 1.4 million tonnes) is captured per year. The carbon dioxide captured (99% purity) from the power plant is compressed and piped about 82 miles to West Ranch Oil Field, Texas, where it will be used for enhanced oil recovery. The field has a capacity of 60 million barrels of oil and is expected to increase oil production by a factor of 506. This project is expected to run for at least another 20 years.
The federal government in the 2008 and 2009 budgets has invested approximately $1.4 billion in Carbon Capture and Storage development.
Alberta has committed $170 million in 2013/2014 – and a total of $1.3 billion over 15 years – to fund two large-scale CCS projects that will help reduce CO2 emissions from tar sands refining. In 2010 a grant agreement was signed with the Alberta Carbon Trunk Line. The second is the Quest Project. The Quest project uses amine absorption to capture CO2 from the Scotford Steam Methane Reformer units. Approximately 1.2 Mtonne CO2 per year is captured and transported through 64 km of onshore pipeline into a saline aquifer in the Cambrian Basal Sands.
Quest Carbon Capture and Storage ProjectEdit
Quest Carbon Capture and Storage Project captures and stores underground one million tonnes of CO2 emissions per year. The capture unit is located at the Scotford Upgrader in Alberta, Canada, where hydrogen is produced to upgrade bitumen from oil sands into synthetic crude oil.
The objective of the Weyburn-Midale Carbon Dioxide Project is to increase oil production and extend the oil field’s lifetime through Enhanced Oil Recovery (EOR) by injecting the captured CO2 from the Dakota Gasification Company's Great Plains Synfuels Plant in North Dakota and SaskPower’s coal-fired Boundary Dam Power Station in Saskatchewan, Canada into the Weyburn oilfields.
Spectra Energy's Fort Nelson Project is proposed but still needs to secure funding. The total project cost is estimated to be US $12.5 Million. The source of CO2 will be from the Fort Nelson Natural Gas Processing Plant and will be transported 15 km via an onshore pipeline to middle Devonian carbonate rock that is between 6500 and 7000 feet deep. The process will capture 2.2 Megatonne CO2 per year using an amine process in its pre-combustion capture. Injections and MVA Operations have already occurred (2014) and is projected to startup in 2018.
Led by the provincially owned utility, SaskPower, one of the world's first and largest full production carbon capture facilities is operating at the coal fired Boundary Dam Power Station. With an initial investment of $1.5 to $1.6 billion. Of the 90% of CO2 emissions captured, about a half of this will be sold and permanently sequestered in enhanced oil recovery. The remainder is released into the atmosphere during capturing, and processing in the oil field. The project started in May 2011 and became operational in October 2014. The post-combustion full flue gas capture process was to capture 1 million tonnes of CO2 a year. Since opening serious design issues were found in the carbon capture system, resulting in maintenance problems that led to operating only 40% of the time. In 2016 the contracts to sell CO2 were renegotiated to reflect the reduced sales.
The Alberta Saline Aquifer Project (ASAP), Husky Upgrader and Ethanol Plant pilot, Heartland Area Redwater Project (HARP), Wabamun Area Sequestration Project(WASP), and Aquistore.
Another Canadian initiative is the Integrated CO2 Network (ICO2N), a group of industry participants providing a framework for carbon capture and storage development in Canada. Other Canadian organizations related to CCS include CCS 101, Carbon Management Canada, IPAC CO2, and the Canadian Clean Power Coalition.
In the Netherlands, a 68-megawatt oxyfuel plant ("Zero Emission Power Plant") was being planned to be operational in 2009. This project was later canceled.
ROAD (Rotterdam Capture and Storage Demonstration project) is a joint project by E.ON Benelux and Electrabel Nederland / GDF SUEZ Group. Every year, starting in 2015 ROAD will capture around 1.1 million tonnes of CO2 at the new power plant on the Maasvlakte. This will be stored in depleted gas reservoirs under the North Sea. Pending financial approval, the plant hopes to be operational sometime after 2019. But due to uncertainty of the continuance of coal-fired power plant in the Netherlands, the ROAD project is cancelled
In Norway, the CO2 Technology Centre (TCM) at Mongstad began construction in 2009, and completed in 2012. It includes two capture technology plants (one advanced amine and one chilled ammonia), both capturing fluegas from two sources. This includes a gas-fired power plant and refinery cracker fluegas (similar to coal-fired power plant fluegas).
In addition to this, the Mongstad site was also planned to have a full-scale CCS demonstration plant. The project was delayed to 2014, 2018, and then indefinitely. The project cost rose to USD 985 million. Then in October 2011, Aker Solutions' wrote off its investment in Aker Clean Carbon, declaring the carbon sequestration market to be "dead".
In 2015 Norway was reviewing feasibility studies and hoping to have a full-scale carbon capture demonstration project by 2020.
In November 2008, the DOE awarded a $66.9 million eight-year grant to a research partnership headed by Montana State University to demonstrate that underground geologic formations "can store huge volumes of carbon dioxide economically, safely and permanently". Researchers under the Big Sky Regional Carbon Sequestration Project plan to inject up to one million tonnes of CO2 into sandstone beneath southwestern Wyoming.
In the United States, four different synthetic fuel projects are moving forward, which have publicly announced plans to incorporate carbon capture and storage:
- American Clean Coal Fuels, in their Illinois Clean Fuels (ICF) project, is developing a 30,000-barrel (4,800 m3) per day biomass and coal to liquids project in Oakland, Illinois, which will market the CO2 created at the plant for enhanced oil recovery applications. By combining sequestration and biomass feedstocks, the ICF project will achieve dramatic reductions in the life-cycle carbon footprint of the fuels they produce. If sufficient biomass is used, the plant should have the capability to go life-cycle carbon negative, meaning that effectively, for each gallon of their fuel that is used, carbon is pulled out of the air, and put into the ground.
- Baard Energy, in their Ohio River Clean Fuels project, is developing a 53,000 bbl/d (8,400 m3/d) coal and biomass to liquids project, which has announced plans to market the plant's CO2 for enhanced oil recovery.
- Rentech is developing a 29,600-barrel (4,710 m3) per day coal and biomass to liquids plant in Natchez, Mississippi, which will market the plant's CO2 for enhanced oil recovery. The first phase of the project is expected in 2011.
- DKRW Energy is developing a 15,000–20,000-barrel (2,400–3,200 m3) per day coal to liquids plant in Medicine Bow, Wyoming, which will market its plant's CO2 for enhanced oil recovery. The project is expected to begin operation in 2013.
In October 2009, the U.S. Department of Energy awarded grants to twelve Industrial Carbon Capture and Storage (ICCS) projects to conduct a Phase 1 feasibility study. The DOE plans to select 3 to 4 of those projects to proceed into Phase 2, design and construction, with operational startup to occur by 2015. Battelle Memorial Institute, Pacific Northwest Division, Boise, Inc., and Fluor Corporation are studying a CCS system for capture and storage of CO2 emissions associated with the pulp and paper production industry. The site of the study is the Boise White Paper L.L.C. paper mill located near the township of Wallula in Southeastern Washington State. The plant generates approximately 1.2 MMT of CO2 annually from a set of three recovery boilers that are mainly fired with black liquor, a recycled byproduct formed during the pulping of wood for paper-making. Fluor Corporation will design a customized version of their Econamine Plus carbon capture technology. The Fluor system also will be designed to remove residual quantities of remnant air pollutants from stack gases as part of the CO2 capture process. Battelle is leading preparation of an Environmental Information Volume (EIV) for the entire project, including geologic storage of the captured CO2 in deep flood basalt formations that exist in the greater region. The EIV will describe the necessary site characterization work, sequestration system infrastructure, and monitoring program to support permanent sequestration of the CO2 captured at the plant.[needs update]
In addition to individual carbon capture and sequestration projects, there are a number of U.S. programs designed to research, develop, and deploy CCS technologies on a broad scale. These include the National Energy Technology Laboratory's (NETL) Carbon Sequestration Program, regional carbon sequestration partnerships and the Carbon Sequestration Leadership Forum (CSLF).
In October 2007, the Bureau of Economic Geology at the University of Texas at Austin received a 10-year, $38 million subcontract to conduct the first intensively monitored long-term project in the United States studying the feasibility of injecting a large volume of CO2 for underground storage. The project is a research program of the Southeast Regional Carbon Sequestration Partnership (SECARB), funded by the National Energy Technology Laboratory of the U.S. Department of Energy (DOE).
The SECARB partnership will demonstrate CO2 injection rate and storage capacity in the Tuscaloosa-Woodbine geologic system that stretches from Texas to Florida. The region has the potential to store more than 200 billion tons[vague] of CO2 from major point sources in the region, equal to about 33 years of overall U.S. emissions at present rates. Beginning in fall 2007, the project will inject CO2 at the rate of one million tons[vague] per year, for up to 1.5 years, into brine up to 10,000 feet (3,000 m) below the land surface near the Cranfield oil field, which lays about 15 miles (24 km) east of Natchez, Mississippi. Experimental equipment will measure the ability of the subsurface to accept and retain CO2.
The $1.4 billion FutureGen power generation and carbon sequestration demonstration project, announced in 2003 by President George W. Bush, was cancelled in 2015, due to delays and inability to raise required private funding.
The Kemper Project, is a natural gas-fired power plant under construction in Kemper County, Mississippi, which was originally planned as a coal-fired plant. Mississippi Power, a subsidiary of Southern Company, began construction of the plant in 2010. The project was considered central to President Obama's Climate Plan. Had it become operational as a coal plant, the Kemper Project would have been a first-of-its-kind electricity plant to employ gasification and carbon capture technologies at this scale. The emission target was to reduce CO2 to the same level an equivalent natural gas plant would produce. However, in June 2017 the proponents - Southern Company and Mississippi Power - announced that they would only burn natural gas at the plant at this time.
The plant experienced project management problems. Construction was delayed and the scheduled opening was pushed back over two years, at a cost of $6.6 billion—three times original cost estimate. According to a Sierra Club analysis, Kemper is the most expensive power plant ever built for the watts of electricity it will generate.
Texas Clean Energy ProjectEdit
The Texas Clean Energy Project (TCEP) is a "NowGen" Integrated Gasification Combined Cycle (IGCC) facility that will incorporate carbon capture, utilization and storage (CCUS) technology in a first-of-its-kind commercial clean coal power plant. This project is expected to be operational in 2018. It will be the first US-based power plant to combine both IGCC and capture 90% of its emissions.
Big Brown Steam Electric StationEdit
Examples of carbon sequestration at an existing US coal plant can be found at utility company Luminant's pilot version at its Big Brown Steam Electric Station in Fairfield, Texas. This system is converting carbon from smokestacks into baking soda. Skyonic plans to circumvent storage problems of liquid CO2 by storing baking soda in mines, landfills, to be sold as industrial or food grade baking soda, Green Fuel Technologies is piloting and implementing algae based carbon capture, circumventing storage issues by then converting algae into fuel or feed, though this may lead to re-release of the carbon.
The government of the United Kingdom launched a first tender process for a CCS demonstration project in 2007. The project were to use post-combustion technology on coal-fired power generation at 300–400 megawatts or equivalent. The project aimed to be operational by 2014. The Government announced in June 2008 that four companies had pre-qualified for the competition: BP Alternative Energy International Limited, EON UK Plc, Peel Power Limited and Scottish Power Generation Limited. BP subsequently withdrew from the competition, claiming it could not find a power generator partner, and RWE npower sought a judicial review of the process after it did not qualify. This first CCS tender was cancelled in late 2011 when government could not reach agreement with the ScottishPower/Shell/National Grid consortium on terms and cost, for the project based on retrofitting the existing Longannet coal-fired power station in Scotland.
A second tender process was launched by government in 2012 as part of DECC's CCS Commercialisation Programme and two bidders, namely the Shell Peterhead gas-fired power station CCS project and the White Rose CCS project based upon a new oxy-fuel coal-fired unit at Drax power station were selected in 2013 to proceed to a funded front-end engineering and design phase. This second tender was cancelled in November 2015 following a government spending review at the time of the Chancellor's Autumn Statement.
Doosan Babcock has modified their Clean Combustion Test Facility (CCTF) in Renfrew, Scotland to create the largest Oxyfuel test facility currently in the world. Oxyfuel firing on pulverized coal with recycled flue gas demonstrates the operation of a full scale 40 MW burner for use in coal-fired boilers. Sponsors of the project include the UK Department for Business Enterprise and Regulatory Reform (BERR,) as well as a group of industrial sponsors and university partners comprising Scottish and Southern Energy (Prime Sponsor), E.ON UK PLC, Drax Power Limited, ScottishPower, EDF Energy, Dong Energy Generation, Air Products Plc (Sponsors), and Imperial College and University of Nottingham (University Partners).
In 2009 UK firm 2Co Energy was awarded planning permission for a £5bn power station and carbon-capture-and-storage project at Hatfield, near Doncaster and £164m of EU funding. Technology company Samsung agreed to take a 15% stake in the project. It is planned to construct a 60 km (37 mi) pipeline from Stainforth, near Hatfield in South Yorkshire to Barmston in the East Riding of Yorkshire. CO2 would then be stored in natural porous rock beneath the North Sea. National Grid believes the project has the potential to reduce CO2 emissions from power stations across Yorkshire and the Humber by up to 90% and both the proposed White Rose CCS project at Drax Power Station in North Yorkshire and the proposed Don Valley Power Project at Hatfield could benefit from the scheme.
In the Northeast of England, The Northeast of England Process Industry Cluster (NEPIC) of commodity chemical manufacturers are amongst the largest single point producers of carbon dioxide in the United Kingdom and they have created within NEPIC the Process Industry Carbon Capture and Storage Initiative (PICCSI) to study the possibility of a carbon capture and storage (CCS) solution being provided for the chemical and steel manufacturing industry on Teesside, as well as for any carbon based energy production. This CCS technology option is being considered as a result of climate change regulations and the carbon taxation that could become a prohibitive cost for such energy intensive industries.
In Beijing, as of 2009, one major power plant is capturing and re-selling a small fraction of its CO2 emissions. Technologies like CCS result in uncertainties that also need to be monitored. Interval fuzzy stochastic programming(IFSP) is used to deal with the multiple uncertainties that may arise in the research of CCS technology.Currently an IFSP for CCS is used in planning CCS in Bayingolin. The results reveal that CCs technology can help lower carbon dioxide emissions in a long term scale.
The German industrial area of Schwarze Pumpe, about 4 kilometres (2.5 mi) south of the city of Spremberg, is home to the world's first demonstration CCS coal plant, the Schwarze Pumpe power station. The mini pilot plant is run by an Alstom-built oxy-fuel boiler and is also equipped with a flue gas cleaning facility to remove fly ash and sulphur dioxide. The Swedish company Vattenfall AB invested some €70 million in the two-year project, which began operation September 9, 2008. The power plant, which is rated at 30 megawatts, is a pilot project to serve as a prototype for future full-scale power plants. 240 tonnes a day of CO2 are being trucked 350 kilometers (220 mi) where it will be injected into an empty gas field. Germany's BUND group called it a "fig leaf". For each tonne of coal burned, 3.6 tonnes of carbon dioxide is produced. The CCS program at Schwarze Pumpe ended in 2014 due to inviable costs and energy use.
In Jänschwalde, Germany, a plan is in the works for an Oxyfuel boiler, rated at 650 thermal MW (around 250 electric MW), which is about 20 times more than Vattenfall's 30 MW pilot plant under construction, and compares to today's largest Oxyfuel test rigs of 0.5 MW. Post-combustion capture technology will also be demonstrated at Jänschwalde.
The Federal Resources and Energy Minister Martin Ferguson opened the first geosequestration project in the southern hemisphere in April 2008. The demonstration plant is near Nirranda South in South Western Victoria. ( The project has moved to a second stage and is investigating carbon dioxide trapping in a saline aquifer 1500 meters below the surface. The Otway Project is a research and demonstration project, focused on comprehensive monitoring and verification.) The plant is owned by the Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC). CO2CRC is a non profit research collaboration supported by government and industry. The project has stored and monitored over 65,000 tonnes of carbon dioxide-rich gas which was extracted from a natural gas reservoir via a well, compressed and piped 2.25 km to a new well. There the gas has been injected into a depleted natural gas reservoir approximately two kilometers below the surface.
This plant does not propose to capture CO2 from coal-fired power generation, though two CO2CRC demonstration projects at a Victorian power station and research gasifier are demonstrating solvent, membrane, and adsorbent capture technologies from coal combustion. Currently, only small-scale projects are storing CO2 stripped from the products of combustion of coal burnt for electricity generation at coal-fired power stations. Work currently being carried out by the GreenMag Group and the University of Newcastle and funded by the New South Wales and Australian Governments and industry intends to have a working mineral carbonation pilot plant in operation by 2013.
Gorgon Carbon Dioxide Injection ProjectEdit
The Gorgon Carbon Dioxide Injection Project is part of the Gorgon Project, the world's largest natural gas project. The Gorgon Project, located on Barrow Island in Western Australia, includes a liquefied natural gas (LNG) plant, a domestic gas plant, and a Carbon Dioxide Injection Project.
The initial carbon dioxide injections are planned to take place by the end of 2017. Once launched, the Gorgon Carbon Dioxide Injection Project will be the world’s largest CO2 injection plant, with an ability to store up to 4 million tons of CO2 per year – approximately 120 million tons over the project’s lifetime, and 40 percent of total Gorgon Project emissions.
Limitations of CCS for power stationsEdit
Critics say large-scale CCS deployment is unproven and decades away from being commercialized. They say that it is risky and expensive and that a better option is renewable energy. Some environmental groups point out that CCS technology leaves behind dangerous waste material that has to be stored, just like nuclear power stations.
Another limitation of CCS is its energy penalty - the reduction in overall plant efficiency due to the carbon capturing process. It has been estimated that about 60% of the energy penalty originates from the capture process itself, 30% comes from compression of CO2, while the remaining 10% comes from electricity requirements for necessary pumps and fans. CCS technology is expected to use between 10 and 40 percent of the energy produced by a power station.,
Wide-scale adoption of CCS may erase efficiency gains in coal power plants of the last 50 years, and increase resource consumption by one third. Even taking the fuel penalty into account, however, overall levels of CO2 abatement would remain high at approximately 80–90%, compared to a plant without CCS. It is possible for CCS, when combined with biomass, to result in net negative emissions. Though, all of the currently (as of Feb 2011) operational BECCS (Bio-energy with carbon capture and storage) plants operate on point emissions other than power stations, such as biofuel refineries.
The use of CCS can reduce CO2 emissions from the stacks of coal power plants by 85–90% or more, but it has no effect on CO2 emissions due to the mining and transport of coal. It will actually "increase such emissions and of air pollutants per unit of net delivered power and will increase all ecological, land-use, air-pollution, and water-pollution impacts from coal mining, transport, and processing, because the CCS system requires 25% more energy, thus 25% more coal combustion, than does a system without CCS".
Another concern regards the permanence of storage schemes. Opponents to CCS claim that safe and permanent storage of CO2 cannot be guaranteed and that even very low leakage rates could undermine any climate mitigation effect. In 1986 a large leakage of naturally sequestered CO2 rose from Lake Nyos in Cameroon and asphyxiated 1,700 people. While the carbon had been sequestered naturally, some point to the event as evidence for the potentially catastrophic effects of sequestering carbon artificially.
On one hand, Greenpeace claims that CCS could lead to a doubling of coal plant costs. It is also claimed by opponents to CCS that money spent on CCS will divert investments away from other solutions to climate change. On the other hand, CCS is pointed out as economically attractive in comparison to other forms of low carbon electricity generation and seen by the IPCC and others as a critical component for meeting mitigation targets such as 450 ppm and 350 ppm.
Although the processes involved in CCS have been demonstrated in other industrial applications, no commercial scale projects which integrate these processes exist; the costs therefore are somewhat uncertain. Some recent credible estimates indicate that the cost of capturing and storing carbon dioxide is US$60 per ton, corresponding to an increase in electricity prices of about US 6c per kWh (based on typical coal-fired power plant emissions of 0.97 kg (2.13 lb) CO2 per kWh). This would double the typical US industrial electricity price (now at around 6c per kWh) and increase the typical retail residential electricity price by about 50% (assuming 100% of power is from coal, which may not necessarily be the case, as this varies from state to state). Similar (approximate) price increases would likely be expected in coal dependent countries such as Australia, because the capture technology and chemistry, as well as the transport and injection costs from such power plants would not, in an overall sense, vary significantly from country to country.
The reasons that CCS is expected to cause such power price increases are several. Firstly, the increased energy requirements of capturing and compressing CO2 significantly raises the operating costs of CCS-equipped power plants. In addition, there are added investment and capital costs. The process would increase the fuel requirement of a plant with CCS by about 25% for a coal-fired plant, and about 15% for a gas-fired plant. The cost of this extra fuel, as well as storage and other system costs, are estimated to increase the costs of energy from a power plant with CCS by 30–60%, depending on the specific circumstances. Pre-commercial CCS demonstration projects are likely to be more expensive than mature CCS technology; the total additional costs of an early large-scale CCS demonstration project are estimated to be €0.5-1.1 billion per project over the project lifetime. Other applications are possible. In the belief that use of sequestered carbon could be harnessed to offset the cost of capture and storage, Walker Architects published the first CO2 gas CAES application, proposing the use of sequestered CO2 for Energy Storage on October 24, 2008. To date the feasibility of such potential offsets to the cost have not been examined.
|Natural gas combined cycle||Pulverized coal||Integrated gasification combined cycle|
|Without capture (reference plant)||0.03–0.05||0.04–0.05||0.04–0.06|
|With capture and geological storage||0.04–0.08||0.06–0.10||0.06–0.09|
|(Cost of capture and geological storage)||0.01–0.03||0.02–0.05||0.02–0.03|
|With capture and Enhanced oil recovery||0.04–0.07||0.05–0.08||0.04–0.08|
|All costs refer to costs for energy from newly built, large-scale plants. Natural gas combined cycle costs are based on natural gas prices of US$2.80–4.40 per GJ (LHV based). Energy costs for PC and IGCC are based on bituminous coal costs of US$1.00–1.50 per GJ LHV. Note that the costs are very dependent on fuel prices (which change continuously), in addition to other factors such as capital costs. Also note that for EOR, the savings are greater for higher oil prices. Current gas and oil prices are substantially higher than the figures used here. All figures in the table are from Table 8.3a in [IPCC, 2005].|
The cost of CCS depends on the cost of capture and storage, which varies according to the method used. Geological storage in saline formations or depleted oil or gas fields typically cost US$0.50–8.00 per tonne of CO2 injected, plus an additional US$0.10–0.30 for monitoring costs. When storage is combined with enhanced oil recovery to extract extra oil from an oil field, however, the storage could yield net benefits of US$10–16 per tonne of CO2 injected (based on 2003 oil prices). This would likely negate some of the effect of the carbon capture when the oil was burnt as fuel. Even taking this into account, as the table above shows, the benefits do not outweigh the extra costs of capture.
Cost of electricity generated by different sources including those incorporating CCS technologies can be found in cost of electricity by source. If CO2 capture was part of a fuel cycle then the CO2 would have value rather than be a cost. The proposed Solar Fuel or methane cycle proposed by the Fraunhofer Society amongst others is an example. This "solar fuel" cycle uses the excess electrical renewable energy to create hydrogen via electrolysis of water. The hydrogen is then combined with CO2 to create synthetic natural gas SNG and stored in the gas network. See the latest Cost Report on the Cost of CO2 Capture produced by the Zero Emissions Platform
Governments around the world have provided a range of different types of funding support to CCS demonstration projects, including tax credits, allocations and grants. The funding is associated with both a desire to accelerate innovation activities for CCS as a low-carbon technology and the need for economic stimulus activities. As of 2011, approximately US$23.5bn has been made available to support large-scale CCS demonstration projects around the world.
Carbon capture and storage and the Kyoto ProtocolEdit
One way to finance future CCS projects could be through the Clean Development Mechanism of the Kyoto Protocol. At COP16 in 2010, The Subsidiary Body for Scientific and Technological Advice, at its thirty-third session, issued a draft document recommending the inclusion of Carbon dioxide capture and storage in geological formations in Clean Development Mechanism project activities. At COP17 in Durban, a final agreement was reached enabling CCS projects to receive support through the Clean Development Mechanism.
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The theoretical merit of CCS systems is the reduction of CO2 emissions by up to 90%, depending on plant type. Generally, environmental effects from use of CCS arise during power production, CO2 capture, transport, and storage. Issues relating to storage are discussed in those sections.
Additional energy is required for CO2 capture, and this means that substantially more fuel has to be used to produce the same amount of power, depending on the plant type. For new super-critical pulverized coal (PC) plants using current technology, the extra energy requirements range from 24 to 40%, while for natural gas combined cycle (NGCC) plants the range is 11–22% and for coal-based gasification combined cycle (IGCC) systems it is 14–25% [IPCC, 2005]. Obviously, fuel use and environmental problems arising from mining and extraction of coal or gas increase accordingly. Plants equipped with flue-gas desulfurization (FGD) systems for sulfur dioxide control require proportionally greater amounts of limestone, and systems equipped with selective catalytic reduction systems for nitrogen oxides produced during combustion require proportionally greater amounts of ammonia.
IPCC has provided estimates of air emissions from various CCS plant designs (see table below). While CO2 is drastically reduced though never completely captured, emissions of air pollutants increase significantly, generally due to the energy penalty of capture. Hence, the use of CCS entails a reduction in air quality. Type and amount of air pollutants still depends on technology. CO2 is captured with alkaline solvents catching the acidic CO2 at low temperatures in the absorber and releasing CO2 at higher temperatures in a desorber. Chilled Ammonia CCS Plants have inevitable ammonia emissions to air. "Functionalized Ammonia" emit less ammonia, but amines may form secondary amines and these will emit volatile nitrosamines by a side reaction with nitrogendioxide, which is present in any flue gas even after DeNOx. Nevertheless, there are advanced amines in testing with little to no vapor pressure to avoid these amine- and consecutive nitrosamine emissions. Nevertheless, all the capture plants amines have in common, that practically 100% of remaining sulfur dioxide from the plant is washed out of the flue gas, the same applies to dust/ash.
|Natural gas combined cycle||Pulverized coal||Integrated gasification combined cycle|
|CO2||0.43 (-89%)||1.07 (−87%)||0.97 (−88%)|
|NOX||0.11 (+22%)||0.77 (+31%)||0.1 (+11%)|
|SOX||—||0.001 (−99.7%)||0.33 (+17.9%)|
|Ammonia||0.002 (before: 0)||0.23 (+2200%)||—|
|Based on Table 3.5 in [IPCC, 2005]. Between brackets the increase or decrease compared to a similar plant without CCS.|
- Bio-energy with carbon capture and storage
- Biological pump
- Carbon capture and storage (timeline)
- Carbon cycle re-balancing
- Carbon dioxide removal
- Carbon sequestration
- Carbon sink
- Clean coal
- Comparisons of life-cycle greenhouse-gas emissions
- Eddy covariance
- Exhaust gas
- Flue-gas desulfurization
- Flue-gas emissions from fossil-fuel combustion
- Flue-gas stack
- Integrated Gasification Combined Cycle
- Landfill gas
- Limnic eruption
- Low-carbon economy
- Northeast of England Process Industry Cluster
- Solid sorbents for carbon capture
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