集超临界水煤气化和CO_(2)捕集的CO_(2)/H_(2)O动力循环性能

Study on CO_(2)/H_(2)O Power Cycle Integrating with Supercritical Water Coal Gasification and CO_(2) Capture

基于超临界水煤气化技术,提出并研究了以超临界水煤气化合成气/O_(2)燃烧产物加循环H_(2)O为循环工质,集高效发电、CO_(2)捕集、移峰储能、低污染物排放等特点的燃气蒸汽混合工质动力循环(GSMC-C循环)。利用数值模拟的方法,研究了关键参数对于循环性能的影响。气化炉中的超临界水和热量均由系统内部提供,液氧的冷能用于实现CO_(2)的液化捕集。在超高压透平进口参数和冷凝参数分别为30 MPa/650℃、30 kPa/30℃,ASU的单位制氧功耗为0.245 kW·h/kg,CO_(2)全捕集参数为4 MPa/5℃的情况下,GSMC-C循环的净效率和毛效率分别为41.34%和48.06%。

Based on supercritical water coal gasification technology,a gas and steam hybrid working medium power cycle(GSMC-C cycle)with supercritical water gasification syngas/O_(2)combustion products plus circulating H_(2)O as the circulating working medium integrating was proposed and studied,which with the feature of high efficiency,CO_(2)capture,peak shift energy storage,and low pollutant discharge.The effects of key parameters on cycle performance were studied by numerical simulation.The supercritical water and heat in the gasifier were provided by the system,and the cooling energy of liquid oxygen was used to realize the liquefaction and capture of CO_(2).The results show that the net efficiency and gross efficiency of GSMC-C cycle are 41.34%and 48.06%respectively when the inlet parameters and condensation parameters of ultra-high pressure turbine are 30 MPa/650℃and 30 kPa/30℃,the unit oxygen production power consumption of ASU is 0.245 kW·h/kg,and the total CO_(2)capture parameters are 4 MPa/5℃.