Carbon Capture and Storage (CCS) technology seeks to reduce emissions from fossil fuel power plants or industrial processes by sequestering CO2. CCS technology has already proven useful for enhanced oil recovery processes as well as for storing CO2 underground in geological formations such as saline aquifers or depleted reservoirs.
However, adding CCS to any power plant increases its costs, so this must be offset with another power source at a more reasonable price.
Gas-separation technology
Carbon capture and storage (CCS) is an innovative pollution control technique used to control CO2 emissions from power plants and industrial facilities, as well as to remove historic emissions from the atmosphere. CCS plays an essential role in meeting international targets to limit climate change.
Gas separation involves many technologies. To select one that best meets your needs, take into account: 1) feed-gas composition and parameters, desired output purity levels, facility costs such as investment and maintenance fees as well as potential economic experience as well as operating flexibility.
Solvent systems utilizing liquid solvents to bind carbon dioxide are among the oldest technologies. Used for decades in oil and gas operations to remove impurities, solvent systems are cost-intensive to heat, cool and move around; energy required to heat cool or move around these solvents adds additional costs to any system. Adsorption-based methods use sorbents which physically or chemically absorb CO2, while cryogenic separation uses high pressure/low temperature techniques to separate gas molecules according to their boiling points – these two are more cost-effective alternatives than using solvent systems alone.
Compressed gas
Carbon capture and storage technologies can help power plants reduce CO2 emissions or remove existing CO2 from the atmosphere, thus helping achieve global climate goals.
At Mines, research on carbon capture and use system (CCUS) encompasses geologic storage of captured CO2, capture from coal gasification processes as well as other energy intensive processes like ethanol and fertilizer production; convert CO2 to commodity chemicals or fuels such as transporting and burning it at conventional coal-fired power generation plants; as well as using CO2 as an enhanced oil recovery (EOR) fluid during drilling operations.
Compressed and liquefied gases stored at 29 psi or higher present numerous hazards if they leak or tip over, according to the University’s Compressed and Liquefied Gases Safety Guidelines [docx]. Researchers should consult these guidelines when working with such cylinders as mechanical failure of valves or regulators can lead to catastrophic release of pressure within them resulting in serious injuries and damages to personnel.
Chillers
Carbon capture and storage (CCS) is an essential technology in combatting greenhouse gases and climate change. CCS can be applied to coal, natural gas or other fossil fuel power plants; however it should be considered complementary with efforts to transition towards cleaner energy sources while increasing energy efficiency.
Heat exchangers play an essential part in CO2 capture. Used both before and after combustion capture, they help control the temperature of flue gas or exhaust and cool off CO2 before it can be separated from gases.
Cooling systems that use natural refrigerants such as CO2 are ideal for this application. Budzar Green’s line of natural refrigerant chillers – including its CO2-chillers – offer reliability, accuracy and dependability in an energy-saving package with minimal footprint. Featuring industrial quality components for maximum service life and superior performance while being eco-friendly.
Injection
CCUS technology is used widely across power plants, cement plants and steel factories, but can also be applied in natural gas processing, fertiliser production, oil refining and enhanced oil recovery (EOR).
CO2 captured from emissions is then transported, typically via pipeline, to a geological storage site for injection underground. Here it may be injected at high pressure into suitable rock formations such as depleted oil and gas reservoirs or saline aquifers in order to keep it out of the atmosphere and prevent its return into it.
CO2 can also be “mineralised”, by chemically reacting it with calcium or magnesium to form stable carbonates that can then be stored underground. While more expensive than geological storage methods, this approach has been considered by several large projects both in Iceland and beyond.
Storage of CO2 underground involves various physical and geophysical mechanisms, including structural trapping in porous rock layers or injection into dense layers of impermeable seal rocks. Monitoring technologies are also in place during injection processes to observe CO2 behavior and ensure it is safely captured, transported and stored underground.