300MW对冲旋流煤粉锅炉高温腐蚀改造的数值模拟研究  

Numerical simulation study on high temperature corrosion reform scheme for 300MW opposed firing boiler

作　　者：袁伟中 刘瑞媚 陈锡炯 章洪涛[2] 关键 王智化[2] 杨卫娟[2] 

机构地区：[1]浙江浙能长兴发电有限公司,浙江长兴313100 [2]浙江大学能源清洁利用国家重点实验室,浙江杭州310027 [3]浙江浙能技术研究院有限公司,浙江杭州310003

出　　处：《能源工程》2016年第6期65-69,共5页Energy Engineering

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB214906)

摘　　要：为改善某300 MW对冲旋流煤粉锅炉出现的侧墙水冷壁高温腐蚀现象,提出了在炉膛前后墙靠侧墙处增设四层贴壁风的改造方案,通过使贴壁风斜吹至侧墙以改善侧墙壁面附近的还原性气氛。对原始工况和改造方案的炉膛热态燃烧进行了数值模拟研究,对比分析了两工况下温度、速度分布以及O_2、CO、H_2S、NO等组分分布。模拟结果显示,增加贴壁风对炉膛整体温度分布、速度分布、氮氧化物排放影响较小,但对侧墙贴壁处影响较大。增加贴壁风后,侧墙贴壁处温度明显下降,O_2浓度增加,CO浓度明显下降,H_2S浓度显著减少,有利于改善侧墙水冷壁烟侧的高温腐蚀现象。To solve high temperature corrosion problem of side walls in a 300MW opposed firing boiler, a scheme by adding four-storey near-wall air on both front and rear walls was presented. By deflecting the near-wall air towards the center of side wall, the reductive atmosphere near side walls was supposed to be weakened. With CFD method, the combustinn process under the conditions with and without near-wall air was simulated. Distributions of temperature, ve- locity and species including O2, CO, H2S under the two conditions were analyzed. The simulation results indicated that, by adding near-wall air, the general distributions of temperature, velocity and NO concentration in the whole furnace were hardly influenced, but distributions near the side walls were affected significantly. With near-wall air, O2 concentration near side walls was increased, while temperature, CO and H2S concentration were decreased significant- ly. Given that, it is beneficial to avoid the high temperature corrosion by introducing near-wall air.

关 键 词：对冲旋流锅炉 高温腐蚀 贴壁风 数值模拟 H2S浓度 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]