Simulation optimization of oxygen-fuel combustion retrofitting of cement production system

CHEN Tao; WANG Yuting; ZHOU Yuegui

doi:10.13226/j.issn.1006-6772.23110602

Abstract：The dry process cement production equipment with a daily production capacity of 3,000 tonnes of clinker was taken as the research object,and Aspen Plus software was used to establish the corresponding production process model.The system energy efficiency of cement clinker production by using oxygen-fuel pulverised coal combustion was investigated,as well as the CO2 capture and integration of the system.The results show that a flue gas recirculation rate of 51％results in an oxygen-fuel atmosphere with the overall oxygen concentration of 26.4％with the temperature profile of the system closest to the air atmosphere at the same cement clinker input condition.The air separation device and CO2 purification and compression device required for oxygen-fuel combustion will lead to a decrease in the energy efficiency of the system,which is 18.9％lower than that of the traditional method,and the production of 1 tonne of cement clinker using this method costs 532.1 yuan.However,the CO2 capture cost of the system for cement clinker production using oxygen-fuel pulverised coal combustion technology is 227.3 yuan/t,which is 58％lower than that of the traditional post-combustion CO2 capture cost.Accordingly,the use of oxygen-fuel combustion technology for cement clinker production not only ensures the clinker yield and quality,but also has a significant carbon capture cost advantage as the CO2 capture cost is lower than that of post-combustion carbon capture technologies.