一、前言最近随着电力需要的急速增加,出现了要求减少发电成本,提高发电机组容量的趋势,进入了建造单机容量为100万千瓦级的超大容量火电或核电汽轮机的时代。日本目前也在制造火电100万千瓦,核电117.5万千瓦级的汽轮机。三菱公司为了制造具有高可靠性、高性能的50周100万千瓦级的火电和核电汽轮机,与美国西屋公司共同研制了50周44时汽 I. INTRODUCTION Recently, with the rapid increase in power demand, there has been a trend toward reducing power generation costs and increasing the capacity of generating units, and has entered an era of building super-large-capacity thermal power plants or nuclear power turbines with a single unit capacity of 1 million kilowatts. Japan is currently also manufacturing steam turbines with 1 million kilowatts of thermal power and 1,175,000 kilowatts of nuclear power. Mitsubishi Corporation in order to create a high reliability, high performance 50 weeks 100 million kilowatts of thermal power and nuclear power turbines, with the Westinghouse co-developed 50 weeks 44 hours steam