Cause analysis and countermeasures of corrosion of flue gas reheater

ZHANG Guangcai; ZHANG Zhixiang; CHE Hongwei; LI Nan; XU Mingqi; LI Hao; HE Weiwei; HAN Jianping; XU Dangqi

doi:10.19666/j.rlfd.201708083

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Cause analysis and countermeasures of corrosion of flue gas reheater

Thermal Power Generation Vol. 47, Issue 4, Pages: 110-115(2018)

更新时间：2025-09-28

- Cause analysis and countermeasures of corrosion of flue gas reheater
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 华能国际电力股份有限公司玉环电厂
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201708083
  CLC： TK223
- Published Online：09 April 2018，
  
  Published：2018
- 稿件说明：
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ZHANG Guangcai, ZHANG Zhixiang, CHE Hongwei, et al. Cause analysis and countermeasures of corrosion of flue gas reheater[J]. Thermal Power Generation, 2018, 47(4): 110-115.
DOI：

ZHANG Guangcai, ZHANG Zhixiang, CHE Hongwei, et al. Cause analysis and countermeasures of corrosion of flue gas reheater[J]. Thermal Power Generation, 2018, 47(4): 110-115. DOI： 10.19666/j.rlfd.201708083.

摘要

针对某电厂烟气再热器的结构设计及腐蚀情况

对换热管和框架腐蚀产物进行了检测

并分析了烟气再热器的腐蚀原因

认为烟气中的雾滴质量浓度较高和Cl-离子质量浓度较高是造成ND钢和316L腐蚀的主要原因。对此

提出了在设计时采取烟道保温和缩短烟气流程来减少烟气冷凝水量

利用节水型湿式除尘器和蒸汽快热段减少进入烟气再热器的雾滴质量浓度

将烟气再热器的材质全部升级为双相不锈钢2205等措施

以提高烟气再热器的寿命。

Abstract

For the structural design and corrosion of the flue gas reheater in a power plant

the corrosion products of heat exchange tubes and frames are examined in this study.And then the corrosion causes of flue gas reheater are analyzed.The results show that high content of fog droplets and high content of Cl-in flue gas are the main causes of the flue gas reheater of corrosion of ND steel and 316 L stainless steel.Therefore

this study puts forward some measures to lengthen the life of flue gas reheater.For example

adopting thermal insulation and shortening the length of flue pipe in the design to reduce the amount of flue gas condensate

using water-saving wet dust collector and steam quick heater to reduce droplet content entering the flue gas reheater

and upgrading the material of flue gas reheater to duplex stainless steel 2205 and so on.

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