汽轮机高中压转子弯曲原因分析

Analysis on bending reasons of high and medium pressure rotors of steam turbine

介绍了机组启动及高中压转子弯曲事故发生的过程,在现场对振动进行了测试,对某发电公司#14汽轮机高中压转子弯曲原因进行了分析。高中压转子弯曲事故的初步原因判定为高中压转子机械力学性能不稳定,机组长期运行导致局部动/静间隙减小,汽封系统蒸汽温度与压力控制不合理,跳机后违反《防止电力生产重大事故的二十五项重点要求》的规定等。

The processes of unit starting-up and the high and medium pressure rotors bending accident were introduced.The vibration was measured on the site.The reasons of the bending accident of high and medium pressure rotors of turbine No.14 in a power generation company were analyzed.According to the preliminary judgment,the reasons of the bending accident of high and medium pressure rotors are that the mechanical properties of the high and medium pressure rotors are unstable,the local dynamic/static clearance is decreased due to long term operation of the unit,the control of the steam temperature and pressure in the steam sealing system is irrational,the rolling decision after tripping is incorrect,that is to roll the turbine as soon as the turbine shut down and do not turn the turbine sufficiently to release the bending caused by the heat stress,which is against the rule of the file '25 Key Requirements to Prevent Serious Accident in Power Production',and so on.