某燃气炉过热器管破裂原因分析  

CAUSE ANALYSIS OF SUPERHEATER TUBE RUPTURE FOR ONE GAS FURNACE

作　　者：杨建菊[1] 冯砚厅[1] 张晓昱[1] 罗立建 

机构地区：[1]河北省电力研究院,河北石家庄050021 [2]华电石家庄热电有限公司,河北石家庄050022

出　　处：《热力发电》2010年第6期76-78,96,共4页Thermal Power Generation

摘　　要：对某电厂1台燃气供热炉停炉再起用后过热器管破裂试样进行宏观、理化、电子显微能谱分析。结果表明,孔洞、微裂纹及晶界腐蚀氧化物是导致材料脆化破裂的主因。同时指出,过热器管下弯头破裂主要是材料本身存在微观损伤和停炉保养造成了氧腐蚀所致,这两方面因素加剧了锅炉在运行后的应力腐蚀,最终形成脆性破裂。The macroscopic analysis,physico-chemical analysis,electron microscopic analysis,and energy spectroscopic analysis have been carried out for specimens of the superheater tube ruptured during the time of start-up after shutdown of one gas furnace used to supply heat in one power plant,results shows that the openings,microfissures,and oxides of grain boundary corrosion are main causes leading to brittle rupture of materials.At the same time,it has been pointed out that the rupture of lower elbow bend on the superheater is mainly due to micro-damage existing in the material proper and oxygen corrosion resulted from conservation after shutdown.The factor in two said aspects intensifies stress corrosion after putting the boiler into operation,and finally resulting in brittle rupture.

关 键 词：燃气炉 过热器管 12CR1MOV 孔洞 微裂纹 氧腐蚀 应力腐蚀 脆性破裂 

分 类 号：TK223.32[动力工程及工程热物理—动力机械及工程]