660 MW超临界对冲火焰锅炉水冷壁高温腐蚀原因探究

doi:10.11930/j.issn.1004-9649.2017.05.007.06

中国电力 ›› 2017, Vol. 50 ›› Issue (5): 7-12.DOI: 10.11930/j.issn.1004-9649.2017.05.007.06

660 MW超临界对冲火焰锅炉水冷壁高温腐蚀原因探究

刘昕昶¹, 鄢晓忠¹, 敬佩¹, 李佩¹, 张艺漫¹, 吴爱军², 陈绍龙²

1. 长沙理工大学能源与动力工程学院,湖南长沙 410004;
2. 湖南宝庆煤电有限公司,湖南邵阳 422000

收稿日期:2017-03-06 出版日期:2017-05-20 发布日期:2017-05-26
作者简介:刘昕昶（1992—）,男,湖南衡阳人,硕士研究生,从事高效清洁燃烧与低污染物排放技术研究。E-mail:782583363@qq.com

Study on the Cause of High-Temperature Corrosion of Water Wall Tubes in a 660-MW Supercritical Opposed Firing Boiler

LIU Xinchang¹, YAN Xiaozhong¹, JING Pei¹, LI Pei¹, ZHANG Yiman¹, WU Aijun², CHEN Shaolong²

1. College of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410004, China;
2. Hunan Coal Electricity Company Limited, Shaoyang 422000, China

Received:2017-03-06 Online:2017-05-20 Published:2017-05-26

摘要/Abstract

摘要： 为了探究超临界对冲火焰锅炉高温腐蚀经常发生的原因及腐蚀机理,以某660 MW超临界对冲火焰锅炉为研究对象,通过燃煤特性分析、水冷壁的厚度测量、炉内水冷壁周围气氛条件测试,以及对腐蚀产物的SEM分析、EDS分析、XRD分析来研究引起水冷壁高温腐蚀的原因。研究结果表明：超临界对冲火焰锅炉水冷壁高温腐蚀主要发生在水冷壁两侧墙的各层燃烧器等高处的高温负荷区;炉内的高温腐蚀是不均匀的,主要是由煤燃烧产生的硫化物及燃烧所需氧与水冷壁高温氧化及高温硫化的作用造成;炉膛下部形成的还原性气氛条件,使H₂S浓度升高,该区域高温腐蚀更加严重。

关键词: 超临界锅炉, 高温腐蚀, SEM分析, EDS分析, XRD分析, 气氛条件, 腐蚀原因

Abstract: In order to explore the causes and the mechanism of frequent high-temperature corrosion in the supercritical opposed firing boilers, the cause analysis is carried out for a 600-MW boiler through the coal quality analysis, the waterwall thickness measurement, the waterwall surrounding atmosphere testing, and the corrosion products analysis by using SEM, EDS and XRD. The study results show that the waterwall high-temperature corrosion occurs mainly in the high-temperature load areas of the burners at all levels on both sides and spreads unevenly. The unevenness is attributed to the high-temperature sulfurization and oxidation caused by the sulfide and the oxygen in the combustion. In addition, the reducing atmosphere formed in the lower part of the furnace leads to the increase of the H₂S concentration making the high-temperature corrosion at this part worse.

Key words: supercritical boiler, high-temperature corrosion, SEM analysis, EDS analysis, XRD analysis, atmosphere condition, cause of corrosion

中图分类号:

TK223.23

刘昕昶, 鄢晓忠, 敬佩, 李佩, 张艺漫, 吴爱军, 陈绍龙. 660 MW超临界对冲火焰锅炉水冷壁高温腐蚀原因探究[J]. 中国电力, 2017, 50(5): 7-12.

LIU Xinchang, YAN Xiaozhong, JING Pei, LI Pei, ZHANG Yiman, WU Aijun, CHEN Shaolong. Study on the Cause of High-Temperature Corrosion of Water Wall Tubes in a 660-MW Supercritical Opposed Firing Boiler[J]. Electric Power, 2017, 50(5): 7-12.

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https://www.electricpower.com.cn/CN/Y2017/V50/I5/7

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660 MW超临界对冲火焰锅炉水冷壁高温腐蚀原因探究

Study on the Cause of High-Temperature Corrosion of Water Wall Tubes in a 660-MW Supercritical Opposed Firing Boiler

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660 MW超临界对冲火焰锅炉水冷壁高温腐蚀原因探究

Study on the Cause of High-Temperature Corrosion of Water Wall Tubes in a 660-MW Supercritical Opposed Firing Boiler

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