循环流化床锅炉过热器爆管诊断分析  

Analysis of superheater tube burst of CFB boiler

作　　者：刘景新[1] 刘乃江[2] 赵斌[2] 刘红星[1] 魏明业[1] 屈婷婷[2] 

机构地区：[1]唐山市特种设备监督检验所,河北唐山063000 [2]河北联合大学,河北唐山063009

出　　处：《节能》2013年第2期66-69,3,共4页Energy Conservation

基　　金：河北省质量技术监督局科研项目(项目编号:2011ZD17)

摘　　要：叙述锅炉过热器爆管的诊断方法,并以某电厂1#CFB锅炉低温过热器管弯头爆裂为例,经对爆管宏观检查,确定过热器弯管裂纹产生原因为热疲劳裂纹。并对过热器弯管进行金相、化学成分和应力分析,其主要原因是材质问题,导致机械性能下降,在烟气冲刷作用下过热器弯管明显减薄,最终在蠕变变形和弯曲残余应力共同作用下导致过热器管弯头开裂。Boiler tube failure is a kind of technical problems that obsess power production chronically.It has engineering practical significance to research on how to prevent the boiler tube failure.In this paper,first is analysised the faculty's diagnostic method of superheater tube bursting of boiler and take the elbow explosion of the low temperature superheater of 1# CFB boiler in a power plant for example.We make sure that the elbow cracks of superheater dues to the thermal fatigue cracks initiatively by the way of examing the bursting tube's macroscopic examination.Further,the metallographical,chemical composition and stress of the superheater tube elbow is analysised,indicating that the main reason of tube bursting is the material do not accord with the standard,leading mechanical properties decrease,and the superheater tube elbow reduce thin obviously under the flue gas scour.The superheater tube elbow cracking is leaded by the combined action of creep strain and bending residual stress finally.

关 键 词：CFB锅炉 过热器 热疲劳 材质 有限元 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]