In-plant experimental study on desulfurized flue gas corrosion

Peiyuan PAN; Heng CHEN; Jian JIAO; Zhiyuan LIANG; Qinxin ZHAO

doi:10.11949/j.issn.0438-1157.20180328

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In-plant experimental study on desulfurized flue gas corrosion

Surface and interface engineering | 更新时间：2020-06-24

- In-plant experimental study on desulfurized flue gas corrosion
- CIESC Journal Vol. 70, Issue 1, Pages: 161-169(2019)
- 作者机构：
  
  西安交通大学能源与动力工程学院热流科学与工程教育部重点实验室，陕西西安 710049
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180328
  CLC： TK 16
- Received：27 March 2018，
  
  Revised：2018-06-12，
  
  Published：05 January 2019
- 稿件说明：
移动端阅览
潘佩媛, 陈衡, 焦健, 梁志远, 赵钦新. 湿法脱硫后烟气腐蚀现场实验研究[J]. 化工学报, 2019, 70(1): 161-169

PAN Peiyuan, CHEN Heng, JIAO Jian, LIANG Zhiyuan, ZHAO Qinxin. In-plant experimental study on desulfurized flue gas corrosion[J]. CIESC Journal, 2019, 70(1): 161-169
潘佩媛, 陈衡, 焦健, 梁志远, 赵钦新. 湿法脱硫后烟气腐蚀现场实验研究[J]. 化工学报, 2019, 70(1): 161-169 DOI： 10.11949/j.issn.0438-1157.20180328.

PAN Peiyuan, CHEN Heng, JIAO Jian, LIANG Zhiyuan, ZHAO Qinxin. In-plant experimental study on desulfurized flue gas corrosion[J]. CIESC Journal, 2019, 70(1): 161-169 DOI： 10.11949/j.issn.0438-1157.20180328.

摘要

基于提升排放烟羽高度以及排烟脱白的需求，必须对燃煤锅炉烟气湿法脱硫后的湿烟气进行妥当处理。但湿法脱硫后的湿烟气腐蚀性很强，将对下游设备造成严重腐蚀。本文在91 MW层燃供热锅炉湿法脱硫系统后烟道进行了现场腐蚀实验，测试和评估了5种钢材的耐腐蚀能力。实验结果表明，钢材的表面温度对腐蚀过程具有关键影响。随着表面温度的升高，钢材的腐蚀程度首先因为表面沉积物中氯离子浓度升高而加剧，然后因电解质的匮乏而减轻。

Abstract

Based on the need to increase the height of the exhaust plume and the whitening of the flue gas

the wet flue gas after the wet desulfurization of the flue gas of the coal-fired boiler must be properly disposed. However

the wet flue gas after wet desulfurization is very corrosive and will cause serious corrosion to downstream equipment. In this paper

in-plant corrosion tests were conducted in the flue after the wet desulphurization system in a 91 MW coal-fired travelling grate heating boiler. Five common corrosion-resistant steels including ND steel

304 L

316 L

2205 and 2507 were tested and then evaluated. According to the results

surface temperature of the steel was the key factor in corrosion process. As the surface temperature increased

corrosion of the steels was first exacerbated due to the increase in Cl

concentration in the deposits and then mitigated due to the lack of the electrolyte.

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Keywords

references

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