300MW机组锅炉屏式过热器爆管原因分析  

Pipe Explosion Reason Analysis of 300 MW unit Boiler Superheater

作　　者：杨占君[1] 苗兴[1] 袁芳[1] 

机构地区：[1]国家电网甘肃省电力公司电力科学研究院,兰州730050

出　　处：《中国特种设备安全》2014年第5期41-43,共3页China Special Equipment Safety

摘　　要：某电厂300MW机组锅炉在投产运行仅仅13260小时便发生了屏式过热器爆管事故,经初步分析该不锈钢管弯管是由于固溶化处理不当,在残余应力、热应力及氯离子等共同作用下,在奥氏体晶界薄弱处产生晶间腐蚀微裂纹,继而不断发展并最终造成爆管事故的发生。建议加强原材料验收检验及规范锅炉运行操作规程,以最大限度减少此类事故的发生。A tube burst accident of superheater is happened on a 300MW unit boiler of a power plant, which was only 13260 hours in operation. The reason of this accident is the combined action of the residual stress, thermal stress and chloride ion, which leads to intergranular corrosion of micro cracks in the weak point of the austenite grain boundary because of the improper solid solution treatment. The micro cracks will increase and cause Pipe burst accident finally. To minimize such kind of accident, the suggestion of strengthening the raw material acceptance test and specification of boiler operation rules is given.

关 键 词：锅炉 屏式过热器 爆管 奥氏体 应力 腐蚀 

分 类 号：X928.3[环境科学与工程—安全科学]