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H_2S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,H_2S等气体的体积分数较高,易引起高温腐蚀。
Aiming at the problem of corrosion occurred in the cold ash hopper area of a 600 MW coal-fired boiler after low NOx 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 bum 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. This work is supported by the Science and Technology Project of Guohua Power Corporation in 2016 （No. 20160801）.
出处
《中国电力》
CSCD
北大核心
2017年第10期110-115,共6页
Electric Power
基金
国华电力公司科技项目2016(20160801)~~
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
coal-fired power plant
boiler
high temperature corrosion
low nitrogen combustion retrofitting
numerical simulation
optimization and adjustment
