Evaluated Results for Pilot Testing of CO2 Capture By Piperazine Regeneratec By the Advanced Flash Stripper

CO₂ capture from coal-fired flue gas was demonstrated with 5m piperazine (30 wt %) regenerated by the Advanced Flash Stripper in 2018 for more than 2000 hours in a 26-inch absorber at the National Carbon Capture Center. 90 to 99% CO₂ removal was achieved with a heat duty of 2.1 to 2.3 GJ/tonne CO₂ removed. The stripper was operating at 6 bar with a sump temperature of 150^oC. The absorber used two 6-meter beds of structured packing with solvent intercooling between the beds. Amine oxidation was less than 0.2 kg/tonne CO₂. Amine aerosol emissions were managed to be less than 1 ppm with 2 ppm of SO₃ by operating with a warm lean feed and with a two-stage water wash. Carbon steel was frequently protected by a FeCO₃ film, both carbon steel and stainless steel experienced unacceptable corrosion at the hot rich condition at 150^oC.