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一、概述近年来,大型汽轮机采用双层缸、新型喷嘴室和全周进汽启动的运行方式,使汽缸等静止部件的低周疲劳大为缓解,所以汽轮机转子成为决定机组寿命的关键部件。所谓转子的寿命,是指转子从投运开始直至产生第一条工程裂纹(有各种定义,一般是指约0.5mm长、0.15mm深的裂纹)转子材料所经受的交变热应力的大小和次数。随着我国用电结构的变化,电网日夜间的用电峰谷差逐渐增大,使得原来一直作为基本
I. Overview In recent years, large-scale steam turbines using dual-cylinder, a new type of nozzle chamber and the whole week into the steam start running mode, so that the cylinder and other stationary parts of the low cycle fatigue greatly alleviated, so the turbine rotor to determine the life of the key components. The so-called rotor life, refers to the rotor from the beginning until the first generation of engineering cracks (there are various definitions, generally refers to about 0.5mm long, 0.15mm deep crack) the amount of alternating thermal stress experienced by the rotor material And the number of times. With the change of the structure of electricity in our country, the difference between the peak and the valley of power grid day and night is gradually increasing,