600 MW锅炉低氮燃烧器改造炉膛高温腐蚀分析

doi:10.11930/j.issn.1004-9649.201702103

中国电力 ›› 2017, Vol. 50 ›› Issue (10): 110-115.DOI: 10.11930/j.issn.1004-9649.201702103

600 MW锅炉低氮燃烧器改造炉膛高温腐蚀分析

贺桂林, 张晓宇

神华国华（北京）电力研究院有限公司,北京 100025

收稿日期:2017-02-27 出版日期:2017-10-25 发布日期:2017-10-30
作者简介:贺桂林（1963—）,男,山西运城人,高级工程师,从事火电厂锅炉运行调整和节能减排方面的技术管理。E-mail: 16051413@shenhua.cc
基金资助:
国华电力公司科技项目2016（20160801）

Analysis on High Temperature Corrosion of a 600 MW Boiler Furnace After Low NO_x Combustor Retrofitting

HE Guilin, ZHANG Xiaoyu

ShenhuaGuohua (Beijing) Electric Power Research Institute Co., Ltd., Beijing 100025, China

Received:2017-02-27 Online:2017-10-25 Published:2017-10-30
Supported by:
This work is supported by the Science and Technology Project of Guohua Power Corporation in 2016 (No. 20160801).

摘要/Abstract

摘要： 针对国内某600 MW锅炉低氮燃烧器改造后冷灰斗区域出现腐蚀的问题,采用试验和数值模拟深入分析了炉膛产生高温腐蚀的原因。试验分析发现,改造后H₂S和CO体积分数在炉膛主燃区、还原区有较大升高。数值模拟分析了流场和温度场,给出了高温区产生的原因：由于托底风量减小,导致A层煤粉组织燃烧恶化,易出现煤粉下沉,在炉膛下部区域燃烧形成高温区;同时,炉膛下部区域缺氧,H₂S等气体的体积分数较高,易引起高温腐蚀。

关键词: 燃煤电厂, 锅炉, 高温腐蚀, 低氮改造, 数值模拟, 优化调整

Abstract: Aiming at the problem of corrosion occurred in the cold ash hopper area of a 600 MW coal-fired boiler after low NO_x combustor retrofitting, the cause analysis is conducted in this paper by adopting testing and numerical simulation. The test results show that the volume fractions of H₂S and CO have bigger promotion at the primary and reducing zones of the furnace after retrofitting. The temperature field and flow field are analyzed through numerical simulation and the causes of high temperature occurrence are concluded as follows. Due to the palm air volume decreasing, the combustion deteriorates in the burners of Layer A, and the pulverized coal tends to deposit and burn at the bottom of the furnace. Therefore, the high temperature zone is formed. At the same time, lack of oxygen at the bottom of the furnace, and the high volume fraction of gases such as H₂S, make it easy to cause high temperature corrosion.

Key words: coal-fired power plant, boiler, high temperature corrosion, low nitrogen combustion retrofitting, numerical simulation, optimization and adjustment

中图分类号:

TM715
TK-9

贺桂林, 张晓宇. 600 MW锅炉低氮燃烧器改造炉膛高温腐蚀分析[J]. 中国电力, 2017, 50(10): 110-115.

HE Guilin, ZHANG Xiaoyu. Analysis on High Temperature Corrosion of a 600 MW Boiler Furnace After Low NO_x Combustor Retrofitting[J]. Electric Power, 2017, 50(10): 110-115.

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https://www.electricpower.com.cn/CN/Y2017/V50/I10/110

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600 MW锅炉低氮燃烧器改造炉膛高温腐蚀分析

Analysis on High Temperature Corrosion of a 600 MW Boiler Furnace After Low NO_x Combustor Retrofitting

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600 MW锅炉低氮燃烧器改造炉膛高温腐蚀分析

Analysis on High Temperature Corrosion of a 600 MW Boiler Furnace After Low NOx Combustor Retrofitting

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Analysis on High Temperature Corrosion of a 600 MW Boiler Furnace After Low NO_x Combustor Retrofitting