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.
出处
《热力发电》
CAS
北大核心
2010年第6期76-78,96,共4页
Thermal Power Generation
