Reason analysis for fracture occurred in axial induced draft fan blade of a 600 MW unit

GU Weiwei; ZHANG Yonghai; LI Yuan; YU Xiaobing; SHI Zhigang

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Reason analysis for fracture occurred in axial induced draft fan blade of a 600 MW unit

Thermal Power Generation Vol. 46, Issue 12, Pages: 129-132(2017)

更新时间：2025-09-28

- Reason analysis for fracture occurred in axial induced draft fan blade of a 600 MW unit
- 作者机构：
  
  1. 西安西热节能技术有限公司
  2. 西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621.7
- Published：2017
- 稿件说明：
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GU Weiwei, ZHANG Yonghai, LI Yuan, et al. Reason analysis for fracture occurred in axial induced draft fan blade of a 600 MW unit[J]. Thermal Power Generation, 2017, 46(12): 129-132.
DOI：

GU Weiwei, ZHANG Yonghai, LI Yuan, et al. Reason analysis for fracture occurred in axial induced draft fan blade of a 600 MW unit[J]. Thermal Power Generation, 2017, 46(12): 129-132. DOI：

摘要

某电厂600 MW机组轴流引风机叶片断裂

为此对故障现场及机组运行历史数据进行了调查分析

对断裂叶片的材料进行了理化检验和断口分析

并对叶片的离心应力和振动特性进行了有限元分析。结果表明:叶片断裂与基体材料的质量无直接关系;叶片静强度和振动特性满足设计标准;叶片断裂的主要原因是叶片涂层质量不良或工艺不当

导致叶片表面在投运前存在微裂纹或运行中产生微裂纹

在离心应力和气流动应力作用下发生了高周疲劳断裂。

Abstract

The blade of axial induced draft fan in a 600 MW unit fractured.To find out the reasons

particular investigations on blade fracture failure site

operation files and history data of the axial induced draft fan were performed.The physical and chemical tests and fracture analysis for the blade were implemented.The centrifugal stress and the vibration characteristics of the blade were analyzed using the finite element method.The results show that

the physical and chemical performance of the blade material satisfied the requirement

the static strength and vibration characteristics of the blade met the design standard

the major reason for the blade fracture was poor quality or improper process of the coating

which made micro cracks exist on the blade surface before or during the unit operation

thus high cycle fatigue fracture occurred under the action of centrifugal stress and flow stress.

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