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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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对冲燃烧锅炉水冷壁高温硫腐蚀分析及防治
, PP. 104-108
Keywords: 超临界,600mw机组,锅炉,对冲燃烧,水冷壁,高温硫腐蚀,贴壁风,腐蚀性气体
Abstract:
在某超临界600mw机组对冲燃烧锅炉检修中发现,侧墙水冷壁存在严重的腐蚀现象。对该区域腐蚀进行检查和烟气氛围测试发现,腐蚀类型为高温还原性硫腐蚀,且侧墙中间区域腐蚀较为严重,其中侧墙壁面附近烟气中腐蚀性气体h2s的体积分数高达10-3以上。对此,设计了一套安装于燃烧区域侧墙水冷壁上的贴壁风系统,改造后a、b侧墙的h2s体积分数分别下降了83.20%和87.16%,a、b侧墙的o2体积分数分别提高了224.5%和155.3%。增加贴壁风系统可有效抑制侧墙还原性气氛的形成,从而控制了水冷壁的高温硫腐蚀。
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