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

Authors: 
Chen, E., University of Texas at Austin
Rochelle, G. T., The University of Texas at Austin
Gao, T., University of Texas at Austin
Wu, Y., The University of Texas at Austin
Akinpelumi, K., The University of Texas at Austin
Fischer, K., The University of Texas at Austin
Liu, C. T., The University of Texas at Austin
Farmer, K., AECOM process technologies
Sexton, A., Trimeric Corporation
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 150oC. 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 150oC.