External Cooling Loop
In the External Cooling Loop (CCC-ECL) process, the flue gas is regeneratively cooled so that 99% of the incoming carbon dioxide freezes into solid dry ice. The dry ice is melted and delivered at pipeline conditions, requiring no gas compression.
External Cooling Loop Cryogenic Carbon Capture (CCC-ECL) process flow diagram
- The flue gas is dried.
- The flue gas is cooled in a proprietary desublimating heat exchanger.
- During the cooling, up to 99% of the CO2 forms a solid and is separated. Pollutants such as mercury, SO2, NO2, Hg, and HCl are also removed at this point.
- The CO2 is pressurized to 70–80 bar.
- The cold products, supplemented by an external cooling loop, cool the incoming flue gas. The solid CO2 melts during this step.
- The warm, liquid CO2 is pressurized to the final delivery pressure: normally 150 bar.
SES has demonstrated the CCC-ECL technology on the bench and small pilot scales on several different fuels including Powder River Basin Coal, natural gas, and a mixture of coal and biomass.
CCC-ECL small pilot demonstration unit
Solid CO2, captured from simulated flue gas, is extruded out of a screw press in the CCC-ECL small pilot demonstration.
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