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本报告简述了叶片断裂的共同特征。对事故的原因提出了看法:叶片原静频较低,运转后静频下降,动频系数B值达不到设计值,以及叶片装配工艺上某些较为明显的缺陷等方面的因素可能是叶片断裂的主要原因,而叶片事故往往还和电厂某些不合理的运行方式及工况,例如周波偏低、汽温偏低、蒸汽品质不好使通流部分结垢严重而不相应地减负荷等因素有关。
This report outlines the common features of leaf fracture. The reasons for the accident are put forward: the original blade low static frequency after running down static frequency coefficient B value does not reach the design value, as well as the blade assembly process some of the more obvious defects and other factors may be leaves The main reason for the breakage is that the blade accident often also relates to some unreasonable operation modes and working conditions of the power plant such as low cycle frequency, low steam temperature and poor steam quality, which cause serious scale fouling in the flow passage without corresponding load reduction And other factors.