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针对现役引进型机组高温蠕变现象难于正确评估的情况,提出了根据机组历次大修记录的变形数据和有限元计算相结合的方法得到材料蠕变参数.采用该方法对某电厂600 MW机组T11级隔板的高温蠕变变形问题进行了分析研究,并应用商用软件对隔板在继续运行中的变形和应力情况作出了预测和评估.结果表明:隔板最大应力产生的位置在隔板外环叶片的出汽侧,靠近中分面边缘叶根、叶片的出汽边处,其值为160 MPa.按每年连续运行8 000 h计算,隔板的使用寿命约为30年,与制造商提供的设计寿命一致,得出了机组在一个大修期内不必立即更换隔板的结论,节约了维修费用,为汽轮机或燃气轮机高温部件的蠕变寿命的评估提供了一种实用方法.
Aiming at the difficult situation of high temperature creep phenomenon of active imported units, the creep parameters of materials are proposed based on the combination of deformation data and finite element calculation of previous overhaul records of the unit.This method is applied to the T11 The high temperature creep deformation of the separator was analyzed and studied, and the commercial software was used to predict and evaluate the deformation and stress of the separator in the continuous operation.The results show that the position where the maximum stress of the separator is generated is located outside the diaphragm outer ring The exit side of the blade, near the root edge of the middle part face and the exit side of the blade, has a value of 160 MPa. The calculated service life of the bulkhead is about 30 years, calculated on an annual basis of 8 000 h. The conclusion is that the unit does not have to be replaced immediately in an overhaul period, which saves the maintenance cost and provides a practical method for evaluating the creep life of high temperature components of steam turbine or gas turbine.