对冲燃烧锅炉防高温硫腐蚀改造的数值研究  

Retrofit of an Opposed Firing Boiler to Prevent High-temperature Sulfur Corrosion

作　　者：李春曦[1] 许涛[1] 李敏[2] 叶学民[1] 

机构地区：[1]华北电力大学动力工程系,河北保定071003 [2]国网河南省电力公司电力科学研究院,郑州450052

出　　处：《动力工程学报》2016年第11期853-861,共9页Journal of Chinese Society of Power Engineering

摘　　要：针对某600MW超临界对冲燃烧锅炉在低氮技术改造后侧墙壁面出现明显的还原性高温硫腐蚀现象,采用在侧墙添加贴壁风装置方案,并对添加贴壁风装置前后工况进行了全炉膛数值模拟,分析了侧墙壁面附近的烟气成分分布以及贴壁风对炉内燃烧和高温硫腐蚀的影响.结果表明:未添加贴壁风装置的原始工况下,壁面附近CO主要集中在侧墙中心,且O2体积分数较低,模拟所得还原性区域与实测腐蚀位置吻合良好;添加贴壁风装置后,侧墙CO体积分数明显下降,O2体积分数明显升高,壁面的还原性气氛得到有效改善,且此方案对炉内燃烧和污染物排放的影响较小.To solve the problem of high-temperature sulfur corrosion occurring on the side water wall of a 600 MW supercritical opposed firing boiler after low-NOx combustion retrofit, a device was added to ar- range near-wall air curtain to the side wall, after which numerical simulation of the furnace combustion was carried out to examine the distribution of flue gas components near the side wall before and after the addi- tion of near-wall air curtain, and to analyze the effects of near-wall air curtain on the in-furnace combustion and high-temperature sulfur corrosion. Results show that under the original condition without near water air curtain, CO is mainly concentrated in the middle area of water wall with lower concentration of O2, where the simulated region of reducing atmosphere is in good agreement with actual region of sulfur corro- sion observed in the boiler; in the case with near-wall air curtain, the CO concentration reduces significant- ly while the O2 concentration rises simultaneously in the area near the side wall, resulting in greatly im- proved reducing atmosphere in the area; the adoption of near-wall air curtain has negligible influence on the furnace combustion and pollutants emission.

关 键 词：对冲燃烧锅炉 水冷壁 高温硫腐蚀 贴壁风 数值模拟 

分 类 号：TK223[动力工程及工程热物理—动力机械及工程]