超高压锅炉再热器集箱及疏水孔内壁裂纹形成原因  

Causes of cracks on inner wall of header and drain hole of reheater of ultra-high pressure boiler

作　　者：张赞赞 潘智 陈超 李勇军 林庆宇 覃健彬 ZHANG Zanzan;PAN Zhi;CHEN Chao;LI Yongjun;LIN Qingyu;QIN Jianbin(Guangxi Special Equipment Inspection and Research Institute,Nanning 530219,China)

机构地区：[1]广西壮族自治区特种设备检验研究院,南宁530219

出　　处：《理化检验（物理分册）》2022年第6期70-74,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：利用宏观观察、化学成分分析、扫描电镜分析、显微硬度测试及有限元模拟等方法,对某超高压锅炉再热器集箱及疏水孔内壁裂纹的形成原因进行研究。结果表明:机组运行状态不稳定、疏水管设置不合理导致再热器疏水回流是集箱内部产生裂纹的主要原因。最后提出了改进措施,对保障机组的安全运行具有一定的指导意义。Macroscopic observation,chemical composition analysis,scanning electron microscopy analysis,microhardness test and finite element simulation were used to study the causes of cracks on the inner wall of the header and drain hole of a super high pressure boiler reheater.The results show that the main reason for the cracks in the header was the hydrophobic reflux of the reheater caused by the unstable operation state of the unit and the unreasonable setting of the drain pipe.Finally,improvement measures were proposed,which had certain guiding significance for ensuring the safe operation of the unit.

关 键 词：再热器集箱 疏水孔 裂纹热疲劳 有限元 

分 类 号：TM621.2[电气工程—电力系统及自动化]