随着以提高电厂效率为目标的蒸汽参数高温高压化,火力发电锅炉的受压部件存在壁厚增加的趋向。另一方面,近年来在核能发电比率增大的情况下,火力发电机组的负荷方式正在向深夜启停和大幅度快速变化的 With the high temperature and pressure of steam parameters aiming at improving power plant efficiency, there is a tendency for the wall thickness of the pressurized components of the thermal power generation boiler to increase. On the other hand, in recent years, when the nuclear power generation ratio has increased, the load pattern of the thermal power generating units is starting and stopping late at night and rapidly changing rapidly