Effect of tubes temperature difference on weld seam crack of header nozzle:stress analysis

MA Hong; ZOU Quanyi; WANG Guohua; WANG Yang; WANG Xingwu

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Effect of tubes temperature difference on weld seam crack of header nozzle:stress analysis

Thermal Power Generation Vol. 44, Issue 7, Pages: 97-100(2015)

更新时间：2025-09-28

- Effect of tubes temperature difference on weld seam crack of header nozzle:stress analysis
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 深圳市能源环保有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK229.929;TM619
- Published：2015
- 稿件说明：
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MA Hong, ZOU Quanyi, WANG Guohua, et al. Effect of tubes temperature difference on weld seam crack of header nozzle:stress analysis[J]. Thermal Power Generation, 2015, 44(7): 97-100.
DOI：

MA Hong, ZOU Quanyi, WANG Guohua, et al. Effect of tubes temperature difference on weld seam crack of header nozzle:stress analysis[J]. Thermal Power Generation, 2015, 44(7): 97-100. DOI：

摘要

针对某垃圾发电余热锅炉过热器管子与集箱连接角焊缝部位频繁开裂的问题

对上下集箱间平行直管的受热面结构及管间温差于管子与集箱连接角焊缝部位的热应力进行分析计算。结果表明

对于本算例

当管间温差大于42℃时

连接部位的一次应力+二次应力已超过相关标准的允许值。综合考虑焊缝形状、焊缝抗疲劳能力等因素

建议将管间温差控制在20℃以下。

Abstract

Weld seam cracking occurred frequently on a waste heat boiler's superheater header nozzle.Thus

the structure of heating surface of parallel straight tubes between the upper and lower headers was analyzed

and the structure thermal stress caused by temperature difference between the tubes was calculated.When the temperature difference between tubes is higher than 42 ℃

the primary plus secondary stress of connection parts has exceeded the related standards.Considering factors like the weld shape

weld fatigue resistance weakening and others

suggestion that the temperature difference between tubes should be controlled below 20 ℃ was put forward.

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