汽轮机是大型火力发电站的主要原动机,它是动力工业的主力。其工作的可靠性,决定了电网的可靠性,从而对国民经济各部门起着极其重要的作用。因此,必须保证汽轮机可靠地按预定的要求进行工作。以往汽轮机部件所发生的事故,大体有如下几种情况: (1)运行时间太长,超过了部件预定的正常寿命,导致部件不能正常工作或报废; (2)设计不合理,造成局部应力太大,或由于材料、加工、装配缺陷兼之应力较 Turbine is the main prime mover of a large thermal power plant, which is the main force in the power industry. The reliability of its work determines the reliability of the power grid and thus plays an extremely important role in all sectors of the national economy. Therefore, it must be ensured that the steam turbine works reliably according to the predetermined requirements. In the past, the accidents occurred in turbine components were as follows: (1) The operating time was too long and exceeded the normal life expectancy of components, resulting in the components not working or scrapped; (2) The unreasonable design resulted in local stress too Large, or due to the material, processing, assembly defects and both stress