At present,the chemical looping combustion of coal comprises of the following three steps:coal pyrolysis,coal char gasification,and the reaction of coal pyrolysis and gasification products with oxygen carrier.The entire combustion conversion process is limited by the slower coal coke gasification process,which lead to a decrease in combustion efficiency and CO2 capture efficiency.Because of the oxygen carrier used in chemical looping oxygen uncoupling combustion with the ability to absorb and release oxygen,coal coke directly react with the gaseous oxygen released by the oxygen carrier,avoiding the slower coal coke gasification process and significantly improving the fuel conversion rate.This paper builds a 600 MW chemical linked oxygen decoupling coal-fired power generation system using CuO/Cu2O as oxygen carrier using Aspen Plus software.Based on the simulation results of the system,energy,exergy,and exergy cost analyses were conducted separately.The results show that the net heat efficiency of the chemical looping oxygen uncoupling coal-fired power generation system is 37.66％;The component with the highest internal exergy loss in the system is the combustion reactor,which accounts for 44.23％of the total internal exergy loss in the subsystem.When only the power generation is used as a product,the efficiency of the chemical looping oxygen uncoupling coal-fired power generation system is 36.27％.If high concentration CO2 is also used as a product,the efficiency of the system is 40.47％.In the chemical looping oxygen uncoupling coal-fired power generation system,the component with the largest unit exergy cost is the seventh feedwater heater,followed by the fifth LP turbine,condenser,the first HP turbine and air preheater.
chemical looping oxygen uncoupling coal-fired power generation systemAspen Plussystem simulationexergy analysesexergy cost analyses
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