Investigation of corrosion and protection on the external surface of desulfurization equipment for the coal-fired power plant

XU Song1; FENG Bing1; HE Shan-jun2

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Investigation of corrosion and protection on the external surface of desulfurization equipment for the coal-fired power plant

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- Investigation of corrosion and protection on the external surface of desulfurization equipment for the coal-fired power plant
- Vol. 32, Issue 6, Pages: 27-29+32(2012)
- 作者机构：
  
  1. 湖南省电力公司科学研究院
  2. 大唐耒阳发电厂
- 作者简介：
- 基金信息：
- DOI：
  CLC： X773
- Published：2012
- 稿件说明：
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[1]徐松,冯兵,贺善君.火电厂脱硫烟道腐蚀原因调查与防护技术分析[J].湖南电力,2012,32(06):27-29+32.

XU Song1, FENG Bing1, HE Shan-jun2. Investigation of corrosion and protection on the external surface of desulfurization equipment for the coal-fired power plant[J]. 2012, 32(6): 27-29+32.
[1]徐松,冯兵,贺善君.火电厂脱硫烟道腐蚀原因调查与防护技术分析[J].湖南电力,2012,32(06):27-29+32. DOI：

XU Song1, FENG Bing1, HE Shan-jun2. Investigation of corrosion and protection on the external surface of desulfurization equipment for the coal-fired power plant[J]. 2012, 32(6): 27-29+32. DOI：

摘要

通过对腐蚀产物进行能谱（EDS）和X射线衍射（XRD）分析

结合实际运行状况的调查

确定脱硫烟道外部腐蚀原因是脱硫烟道气密性不严

泄漏的SO2气体在雨水或者潮湿大气作用下与镀锌金属发生腐蚀反应

讨论相关腐蚀机理

论证牺牲阳极保护法不可行性

并提出采用耐酸涂料的防护对策。

Abstract

According to the analysis of energy dispersive spectra（EDS）

X-ray diffraction（XRD） and the investigation of actual operating condition

it is determined that the reason of corrosion on the external surface of desulfurization equipment is leakage of SO2 from flue gas ducts.The interaction of SO2 and rain or wet atmosphere accelerats the corrosion of Zn coating.The related mechanism of corrosion is discussed and the method of sacrificial anode is demonstrated not feasible.The protection countermeasure of acid-resistant coating is suggested.

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Jiangxi Electric Power Design Institute

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