Carbon Capture and Storage (CCS) is a technology which isolates and transports an ultra-pure stream of carbon dioxide produced from industrial sources, combining it with bioenergy sources or injecting it deep underground for permanent storage.
Compressed CO2 is then transported via pipeline, ship, train or truck for storage in deep geological formations such as depleted oil and gas reservoirs or saline aquifers.
What is Carbon Capture and Storage?
Carbon Capture and Storage (CCS) technology works by extracting CO2 emissions from power plants and industrial facilities before it enters the atmosphere, helping prevent it from contributing to climate change. Once captured, CCS stores it permanently underground where its presence will help limit future warming while keeping global temperatures within safe thresholds.
Current CCS projects employ either post-combustion or oxyfuel technologies for CO2 capture. With post-combustion CCS, chemical solvents separate CO2 from flue gas at fossil fuel power plants while with oxyfuel CCS coal is burned using pure oxygen instead of air which allows CO2 capture more easily.
Once carbon dioxide has been captured and processed, it is transported via pipeline or ship to its permanent storage site. Multiple CCS projects have already begun operation worldwide including:
How is Carbon Capture and Storage done?
Carbon capture and storage (CCS) involves the separation, treatment, transport, and long-term storage of relatively pure streams of CO2 produced during fossil fuel production.
CCS projects often take place at power plants, natural gas processing assets and synthetic fuel and hydrogen production plants. CO2 can also be captured directly from the air using less efficient methods like capture.
Captured CO2 is typically transported via pipelines. As significant energy is expended to compress it into liquid form for transportation, specialized pipelines designed for this purpose may be required for efficient transportation of CO2.
CO2 can then be safely pumped underground or used in products like concrete to store it permanently, while some organizations use carbon capture and storage (CCUS) as a method to offset emissions, becoming carbon neutral in this way. No matter how captured, carbon must not enter the atmosphere to contribute to climate change.
What are the Benefits of Carbon Capture and Storage?
Carbon capture and storage (CCS) captures greenhouse gas CO2, mitigating its contribution to global warming. A related process called carbon utilization and storage (CCSU) utilizes this captured CO2.
Capturing occurs at power plants or industrial facilities producing large volumes of emissions. Technologies include absorption, adsorption, chemical looping and membrane gas separation as well as CCS systems designed to use biofuels such as those producing ethanol for capture.
CO2 captured from capture sites is transported via pipeline and stored underground in depleted coalbeds, oil/gas reservoirs or deep saline formations for permanent storage or enhanced carbon dioxide recovery (ECOR). EOR allows enhanced oil recovery.
CCS could contribute approximately 20 percent of emissions reductions needed to reach net zero by 2050, according to energy consultant Wood Mackenzie. Unfortunately, however, its implementation can be costly; thus many polluters may only invest if forced by law or offered financial incentives to do so.
What are the Challenges of Carbon Capture and Storage?
Carbon Capture and Storage technology is costly, complicated, and has caused much debate within environmentalist circles as many believe that its implementation detracts from investments in alternative energy sources while perpetuating our dependence on fossil fuels.
CO2 from power plants can be stored safely underground. Two viable storage sites for CO2 capture include ocean environments (as carbonate minerals) or saline aquifers with enough pore space; such storage locations must undergo significant site characterization to ensure safe injection and storage of carbon dioxide.
Transport of captured CO2 presents another obstacle. Because it must be transported as a supercritical fluid under reservoir conditions, special pipelines must be built that maintain high pressure and low temperature levels – this is very costly to build and existing oil and gas pipelines cannot be used as storage solutions. Finally, CO2 storage requires policies to encourage investment and development such as carbon pricing policies or clean energy standards that reward companies producing electricity with CCS technology.