Reason analysis on deformation and tube burst of high temperature reheater for a supercritical boiler

XIAO Guohua; FENG Linjie; TIAN Xiao; CAO Jianfeng; YANG Baixun

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Reason analysis on deformation and tube burst of high temperature reheater for a supercritical boiler

更新时间：2025-09-28

- Reason analysis on deformation and tube burst of high temperature reheater for a supercritical boiler
- Thermal Power Generation Vol. 42, Issue 10, Pages: 111-115(2013)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 华能平凉电厂
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK223.32
- Published：2013
- 稿件说明：
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XIAO Guohua, FENG Linjie, TIAN Xiao, et al. Reason analysis on deformation and tube burst of high temperature reheater for a supercritical boiler[J]. Thermal power generation, 2013, 42(10): 111-115.
DOI：

XIAO Guohua, FENG Linjie, TIAN Xiao, et al. Reason analysis on deformation and tube burst of high temperature reheater for a supercritical boiler[J]. Thermal power generation, 2013, 42(10): 111-115. DOI：

摘要

针对某超临界机组锅炉高温再热器T91前屏爆管及出口TP347H直管变形的问题

通过对其进行宏观形貌、化学成分、金相组织、硬度、室温和高温拉伸性能等分析。结果表明:前屏爆管为焊接时采用规范的线能量较高、焊后热处理不当、焊接结构设计不合理导致母材与吊板衔接的角焊缝出现裂纹所致

管系结构设计引起的管屏应力也起到了一定的促进作用;高温再热器出口直管段变形与管屏拘束和TP347H材料高温强度较低有关。

Abstract

Tube burst and straight tube deformation occurred on T91 steel pipes in front plane and TP347H steel pipes at outlet of the high temperature reheater in a power plant

respectively.Thus

several tests were conducted to find out the reasons

such as field investigation

macro-morphology observation

chemical composition analysis

metallographic observation

hardness tests

room-temperature and high temperature tensile tests.The results showed that the tube burst was due to crack in fillet weld where the hanger plate was connected to the base material.The crack was induced by high hardness of fillet weld of the hanger plate

high welding criterion

improper welding structure design and PWHT process.Moreover

it was also promoted by tube panel stress related to the tube system structure design.The curvature of the straight tube at outlet of the high-temperature reheater was related to the tube panel constraint and low high-temperature strength of TP347H steel.

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