High-temperature corrosion analysis for a subcritical boiler after ultra low NO<sub>x</sub> emission transformation

LI Ruping; TONG Jialin; LYU Hongkun; YE Yunyun; LUO Shaohui

doi:10.19666/j.rlfd.201808154

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High-temperature corrosion analysis for a subcritical boiler after ultra low NO_x emission transformation

更新时间：2025-09-28

- High-temperature corrosion analysis for a subcritical boiler after ultra low NO_x emission transformation
- Thermal Power Generation Vol. 48, Issue 5, Pages: 102-108(2019)
- 作者机构：
  
  1. 国网浙江省电力有限公司电力科学研究院
  2. 浙江国华浙能发电有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201808154
  CLC： TK224.9
- Published Online：29 April 2019，
  
  Published：2019
- 稿件说明：
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LI Ruping, TONG Jialin, LYU Hongkun, et al. High-temperature corrosion analysis for a subcritical boiler after ultra low NO_x emission transformation[J]. Thermal power generation, 2019, 48(5): 102-108.
DOI：

LI Ruping, TONG Jialin, LYU Hongkun, et al. High-temperature corrosion analysis for a subcritical boiler after ultra low NO_x emission transformation[J]. Thermal power generation, 2019, 48(5): 102-108. DOI： 10.19666/j.rlfd.201808154.

摘要

某亚临界锅炉超低NO_x排放改造发生高温腐蚀情况

对其水冷壁贴壁气氛进行了测试

并采用模拟装置对腐蚀产物进行理化分析。结果表明:节点功能区、主燃烧区和燃尽区之间的还原区还原性气氛较强

2号角和4号角总体二次风量相对不足

这样增大了2个角附近区域的高温腐蚀;机组高-低负荷循环波动使高温腐蚀不断深入;若管材含有一定的Cr元素

可增强管材的抗腐蚀能力。在锅炉实际运行中

应改善二次风不均匀性

同时在腐蚀风险较高的区域合理应用含Cr元素管材。

Abstract

In order to eliminate the high-temperature corrosion on water wall of a subcritical boiler after ultra low NO_x emission transformation

the atmosphere around the water wall was tested

and simulation device was employed to carry out physical and chemical analysis for the corrosion products. The results show that

the reducing atmosphere was strong at the node function area and the reducing zone between the main combustion zone and the burning-out zone. The overall secondary air volume at No.2 and No.4 corner was relatively insufficient

which increased the high temperature corrosion in the area near the two angles. The high-and low-load cycle fluctuation of the unit caused continuous deepening of high-temperature corrosion. The corrosion resistance of the pipe can be enhanced if the pipe contains a certain Cr element. In actual operation of the boiler

the non-uniformity of secondary air should be improved

and the Cr-containing pipe shall be reasonably applied in the areas with higher corrosion risk.

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Related Author

WU Zhan-song21.Guangdong Electric Power Design Institute

YIN Jia-min1

WU Zhan-songKey Laboratory of Thermal Science and Power Engineering under Educatoinal Ministry

YIN Jia-min

WEI Feng-qun2 (1.Xi’an Thermal Power Research Institute Co Ltd

WANG Chun-chang1

ZUO Shuang-ji(Nei Monggol Industrial University

QIU Xian-tang1

Related Institution

Key Laboratory of Thermal Science and Power Engineering, Ministry of Education, Tsinghua University

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High-temperature corrosion analysis for a subcritical boiler after ultra low NOx emission transformation

DOI：10.19666/j.rlfd.201808154

摘要

Abstract

关键词

Keywords

references

High-temperature corrosion analysis for a subcritical boiler after ultra low NO_x emission transformation