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超临界循环流化床锅炉末级过热器爆管原因分析 预览

Cause Analysis on Tube Explosion of Finishing Superheater in a Supercritical Circulating Fluidized Bed Boiler
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摘要 通过宏观检查、化学成分分析、金相检验、力学性能试验、断口分析及能谱分析等方法,对某超临界循环流化床锅炉末级过热器爆管原因进行了分析。结果表明:爆管类型为应力腐蚀开裂,应力是导致爆管的主要因素,主要来自管屏整体在运行过程中由于受热不均匀而产生的热胀应力和角焊缝的焊接残余应力。最后提出了相应的预防措施。 By means of macroscopic inspection,chemical composition analysis,metallographic examination,mechanical property test,fracture analysis and energy spectrum analysis,the causes for the tube explosion of the finishing superheater in a supercritical circulating fluidized bed boiler were analyzed.The results show that the type of the tube explosion was stress corrosion cracking,and the stress which mainly came from the thermal expansion stress due to the thermal unbalance during operation and the welding residual stress of the fillet weld,was the main factor for the tube explosion.Finally,relevant preventive measures were put forward.
作者 庄文斌 张国良 秦永亮 郑坊平 ZHUANG Wenbin;ZHANG Guoliang;QIN Yongliang;ZHENG Fangping(Shenhua Guoneng Ningxia Coal and Electricity Co.,Ltd.,Lingwu 750041,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710032,China)
出处 《理化检验:物理分册》 CAS 2019年第2期120-124,共5页 Physical Testing and Chemical Analysis Part A:Physical Testing
关键词 末级过热器 爆管 应力腐蚀开裂 热胀应力 焊接残余应力 finishing superheater tube explosion stress corrosion cracking thermal expansion stress welding residual stress
作者简介 庄文斌(1983-),男,助理工程师,学士,主要从事电厂金属部件的监督管理工作;通信作者,郑坊平(1980-),男,高级工程师,硕士,主要从事电厂金属监督检验工作,19484014@qq.com
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