TYPES OF CCS
Post-combustion capture is commonly used in existing power plants and factories, scrubbing CO₂ out of flue gas after fuel is burned with chemical solvents like amines.
Pre-combustion capture is used in industrial processes like hydrogen production. Fuel is partially oxidised to create syngas and CO₂ is removed before then hydrogen is used for power or heat.
Oxy-fuel combustion sees fuel burned in nearly pure oxygen instead of air, producing a waste stream of almost pure CO₂ and water vapor.
Direct air capture( DAC) is a technology that pulls CO₂ from ambient air using giant fans and chemical solvents.
Geological storage injects CO₂ into deep underground rock formations like saline aquifers or depleted oil and gas reservoirs. At depths of 1 km or more, pressure keeps the CO₂ in a supercritical state where it behaves like a liquid.