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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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燃用生物质锅炉末级过热器管腐蚀原因分析
, PP. 98-100
Keywords: 锅炉,过热器,腐蚀,tp347h,碱金属,生物质,氯离子
Abstract:
某台燃用生物质锅炉在累计运行4000h后，末级过热器管(材质为tp347h)外壁发生了较严重的腐蚀，对腐蚀部位进行显微组织、能谱成分及x射线衍射分析。结果表明，末级过热器管存在均匀腐蚀及晶界腐蚀；腐蚀层主要含cl、k离子而cr含量相对较低；晶界腐蚀产物主要为cr和fe的氧化物，其中cr含量较高。分析认为生物质中的氯离子是导致管外壁快速腐蚀的主要原因，而碱金属与fe等其它元素形成的低熔点共晶体促进了腐蚀过程。对此，提出去除燃料中的部分k和cl，将生物质与煤混燃等措施。
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