Solvent Screening and Feasible Study of Retrofitting CO2 Capture System for Natural Gas Combined Cycle Power Plant

Abstract The feasible study for retrofitting CCS to the natural gas combined cycle (NGCC) was carried out by Toshiba and China Huadian Engineering Co. (CHEC). The 390MW Banshan NGCC power plant owned by China Huadian Corporation (CHD) in Hangzhou China was selected as a model plant. The CO 2 concentration in the flue gas is about 4 vol. %, which is lower than that of coal fired power plant. Amine solvents for the NGCC were selected after investigating a vapor liquid equilibrium (VLE) in laboratory. CO 2 recovery energy for capturing CO 2 for amine solvents were investigated using Toshiba's Mikawa CO 2 capture pilot plant located in Fukuoka Japan, which has the ability to control the concentration of CO 2 in live flue gas from coal fired power plant before feeding the flue gas into the absorber tower. The recovery energy under 4 vol. % CO 2 , 3.0GJ/t-CO 2 with 70% capture efficiency was determined for calculation the influence of the steam extraction on the overall steam cycle in power plant. In addition, the estimation of construction and operation cost were executed. It was found that total cost of CO 2 capture for full capture is 570 RMB /t-CO 2 and that of partially capture case is 879 RMB/t-CO 2 .