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

External Cooling Loop Cryogenic Carbon Capture (CCC-ECL) process flow diagram

  1. The flue gas is dried.
  2. The flue gas is cooled in a proprietary desublimating heat exchanger.
  3. 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.
  4. The CO2 is pressurized to 70–80 bar.
  5. The cold products, supplemented by an external cooling loop, cool the incoming flue gas. The solid CO2 melts during this step.
  6. The warm, liquid CO2 is pressurized to the final delivery pressure: normally 150 bar.

Demonstrations

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

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.

View all demonstrations