Study on the performance of coal-fired power plant integrated with Ca-looping CO2 capture system with recarbonation process

Abstract

This paper studies the performance of a coal-fired power plant integrated with Ca-looping CO2 capture system with recarbonation process. The Ca-looping CO2 capture system with/without the recarbonation process are simulated using the ASPEN PLUS™ software and integrated in a coal-fired power plant with the net system efficiency of 41.57%. Simulation results of the two systems are compared, and a sensitivity analysis of the key parameters is taken. The results show that, when the CO2 capture rate is 85%, the net system efficiency of the coal-fired power plant integrated with the traditional Ca-looping CO2 capture system without recarbonation process is 30.66%. The efficiency penalty is 10.91% compared with that of the benchmark coal-fired power plant without CO2 capture. While the net efficiency of the coal-fired power plant integrated with the Ca-looping CO2 capture system with recarbonation process is 34.3% and the efficiency penalty is only 7.27%. The analysis results show that reducing the amounts of both calcium sorbents and the fresh sorbent supplement in cycles can further improve the efficiency of the overall system. The achievements from this paper will provide the valuable reference for the CO2 capture from the coal-fired power plant with lower energy consumption.