Application of chemical looping air separation for MILD oxy-combustion in the supercritical power plant with CO2 capture

Chemical looping air separation (CLAS) is a novel and promising technology for oxygen production. This paper presents the application of CLAS to the supercritical power plant for MILD oxy-combustion. Compared with the reference conventional supercritical power plant, the power generation efficiency of the CLAS integrated MILD oxy-combustion plant is only reduced by about similar to 1.37% points at the baseline case. CO2 compression process imposes additional similar to 3.97% points efficiency penalty, which is inevitable to all of the CO2 capture technologies. The net power efficiency of the CLAS integrated MILD oxy-combustion plant is similar to 37.37%. Even though a higher reduction reactor temperature could boost the power efficiency and a higher oxidization reactor temperature reversely decreases the power efficiency, the influence of reactor temperature is marginal. The performance of CLAS integrated MILD oxy-combustion plant is not sensitive to excess CO2 and O-2 ratio. Different oxygen carriers have different suitable operating region, but possess similar power efficiency. The carbon capture rate of the CLAS integrated MILD oxy-combustion plant is up to similar to 100%, resulting in a virtually carbon-free fossil power plant.