Compressed Flue Gas
In the Compressed Flue Gas (CCC-CFG) process, the flue gas is moderately compressed, cooled, then expanded, to remove 99% of carbon dioxide with only minimal refrigeration required.
Compressed Flue Gas Cryogenic Carbon Capture (CCC-CFG) process flow diagram
- The flue gas is dried and compressed to 5–7 bar.
- The flue gas is cooled in a proprietary desublimating heat exchanger.
- During the cooling, up to 75% 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 gas is expanded and cooled in a turbine, causing more CO2 to solidify. At this point, 99% of the original CO2 has been captured.
- The captured CO2 is pressurized to 70–80 bar.
- The cold products are used to 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.
The first demonstration of CCC-CFG was a small pilot unit. This unit has been tested successfully at two on-site locations and has accumulated hundreds of hours of run time.
Interior of the small pilot unit showing the flue gas compressor
The CCC-CFG small pilot bubbling desublimating heat exchanger
View inside one of the heat exchangers in the CCC-CFG small pilot. The white smoky substance is solid CO2.
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