Cause analysis and countermeasures for blade fracture of static blade adjustable axial flow induced draft fan

LI Yongle; LUO Guibing; YANG Hui

doi:10.19666/j.rlfd.202006212

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Cause analysis and countermeasures for blade fracture of static blade adjustable axial flow induced draft fan

更新时间：2025-09-28

- Cause analysis and countermeasures for blade fracture of static blade adjustable axial flow induced draft fan
- Thermal Power Generation Vol. 50, Issue 4, Pages: 114-119(2021)
- 作者机构：
  
  1. 北方联合电力有限责任公司包头第三热电厂
  2. 西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202006212
  CLC： TM621.2
- Published：2021
- 稿件说明：
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LI Yongle, LUO Guibing, YANG Hui. Cause analysis and countermeasures for blade fracture of static blade adjustable axial flow induced draft fan[J]. Thermal power generation, 2021, 50(4): 114-119.
DOI：

LI Yongle, LUO Guibing, YANG Hui. Cause analysis and countermeasures for blade fracture of static blade adjustable axial flow induced draft fan[J]. Thermal power generation, 2021, 50(4): 114-119. DOI： 10.19666/j.rlfd.202006212.

摘要

某600 MW机组静叶可调轴流式引风机采用小汽轮机驱动

运行中发生叶片断裂问题

断裂面启裂位置为叶轮与调频环焊接位置。通过分析风机运行参数及断裂叶片理化检测结果发现

风机叶轮与调频环焊缝处存在疲劳导致叶片断裂。为解决叶轮与调频环处焊缝开裂问题

对叶轮进气侧调频环位置及结构进行优化改进

新调频环焊接在叶片根部

并更改为口圈结构;为避开新调频环位置改变后叶片的固有频率

通过叶片测频工作测试引风机叶片在设计转速范围内叶片通过频率发生共振的转速约为752、1 098 r/min

引风机实际运行转速应与共振转速保持一定的避开率。

Abstract

The static blade adjustable axial flow induced draft fan of a 600 MW unit is driven by a low-power steam turbine. One of its blades fractured during the operation. The cracking source was the weld between the impeller and the frequency-modulation hoop. The operating parameters and physicochemical analysis indicated that the blade fracture was caused by fatigue. To solve the above problem

the intake-side frequency-modulation hoop was designed to ring of port

and the frequency-modulation hoop was welded at the roots of blades. Moreover

the measured value showed that blade resonance occurred during normal operation when the rotate speed of was about 752 r/min and 1 098 r/min. So the speed of the induced draft fan during operation should avoid the resonance speed.

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