Dynamic strength analysis of the low pressure last stage blade under zero-output heating conditions of low pressure cylinder in a power plant

GU Weiwei; ZHANG Yonghai; YU Xiaobing; GAO Qing; GAO Dengpan; SONG Wenxi

doi:10.19666/j.rlfd.201801041

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Dynamic strength analysis of the low pressure last stage blade under zero-output heating conditions of low pressure cylinder in a power plant

更新时间：2025-09-28

- Dynamic strength analysis of the low pressure last stage blade under zero-output heating conditions of low pressure cylinder in a power plant
- Thermal Power Generation Vol. 47, Issue 5, Pages: 63-70(2018)
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201801041
  CLC： TK262
- Published Online：03 May 2018，
  
  Published：2018
- 稿件说明：
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GU Weiwei, ZHANG Yonghai, YU Xiaobing, et al. Dynamic strength analysis of the low pressure last stage blade under zero-output heating conditions of low pressure cylinder in a power plant[J]. Thermal power generation, 2018, 47(5): 63-70.
DOI：

GU Weiwei, ZHANG Yonghai, YU Xiaobing, et al. Dynamic strength analysis of the low pressure last stage blade under zero-output heating conditions of low pressure cylinder in a power plant[J]. Thermal power generation, 2018, 47(5): 63-70. DOI： 10.19666/j.rlfd.201801041.

摘要

汽轮机低压缸零出力供热工况下

低压缸的进汽流量急剧减小

会导致低压末级叶片运行工况严重偏离设计值而影响其安全性。本文采用有限元方法

建立了某电厂300 MW汽轮机低压末级叶片在汽流激振力下的振动方程

采用直接积分方法分别计算了叶片在设计工况和低压缸零出力供热工况下的动应力。结果表明:设计工况下叶片的最大动应力为5.973 MPa

位于叶顶区域;低压缸零出力供热工况下叶片的最大动应力为1.119 MPa

位于凸肩区域

该最大动应力小于设计工况

说明低压缸零出力供热工况下叶片的动强度满足制造厂设计要求。

Abstract

The steam input flow of low pressure cylinder under zero-output heating conditions is decreased sharply

which causes the last stage blade to seriously deviate from the design value and then affects its safety. Based on the finite element method

the vibration equation of the low pressure last stage blade of a 300 MW steam turbine under steam flow excitation force is established. The dynamic stresses of the blade under the design condition and zerooutput heating conditions of low pressure cylinder are calculated separately by direct integration method. The calculation results show that the maximum dynamic stress under the design condition is 5.973 MPa

which is located in the tip region of the blade. On the other hand

the maximum dynamic stress under zero-output heating conditions of low pressure cylinder is 1.119 MPa

which is located in the shoulder region. The dynamic stress under zerooutput heating conditions of low pressure cylinder is less than that under the design condition

indicating that the dynamic strength of the blade under zero-output heating conditions of low pressure cylinder meets the design requirements of the manufacturer.

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