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Technologies
Three capture technologies and four geologic storage mechanisms are envisaged. These are described and illustrated below:
Capture Technologies
Post-Combustion Scrubbing
Considered the first step towards large-scale capture, CO2 is removed from exhaust gas after combustion. This technology can be retrofitted to existing
equipment.
Pre-Combustion Decarbonization (Hydrogen)
Natural Gas is converted to hydrogen and CO2 in a reformer. The CO2 is compressed for storage and the hydrogen is mixed with air for combustion, emitting only nitrogen and water.
Oxyfuel
Oxygen is separated from air and then burned with hydrocarbons to produce an exhaust with a high concentration of CO2 for storage.
Geologic Storage
The schematic diagram below illustrates options for geologic storage. Note that some options provide additional energy.
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