余热锅炉型联合循环性能潜力分析与超临界底循环初探

ANALYSIS OF HRSG COMBINED CYCLE POTENTIAL PERFORMANCE AND APPROACH WITH BOTTOMING CYCLE

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。

The potential performance of HRSG combined cycle has been analysed based on total energy system concept. The relationship of system performance with heat transfer temperature difference, toppiag cycle temperature ratio aad flue temperature has been derived. Such sy-stems comprising regenerative gas turbine and organic supercritical bottoming eycle have been proposed and discussed.