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一、前言 常规燃气轮机联合循环,在燃气初温高于1260℃时,系统效率已超过50％。余热锅炉节点温差限制了系统效率的进一步提高,所以出现了底部循环使用氨水混合物工质的联合循环,利用氨水混合物在饱和区等压变温的特点,提高系统效率。 如果采用超临界蒸汽底部循环,可避免常规节点温差限制,但高温高压蒸汽膨胀到排汽背压时的湿度会过大而不能直接应用,需采用再热循环或汽水分离,从而减弱了回收余
I. Introduction Conventional gas turbine combined cycle, when the gas initial temperature is higher than 1260 ℃, the system efficiency has exceeded 50%. The temperature difference of the waste heat boiler limits the further improvement of the system efficiency. Therefore, the combined cycle of using the ammonia-water mixture at the bottom occurs and the ammonia-water mixture is used to increase the isothermal pressure in the saturated zone to improve the system efficiency. If the bottom of the supercritical steam cycle, to avoid the conventional node temperature limit, but the high temperature and high pressure steam expansion to the exhaust back pressure when the humidity will be too large to be directly applied, the need to reheat cycle or steam separation, thereby reducing the recovery of more than