承压蒸汽锅炉烟管开裂原因  

Causes of smoke pipe cracking of pressure steam boiler

作　　者：李朝辉 盖跃华 LI Zhaohui;GAI Yuehua(Shenzhen Survey&Appraisal Agency of Quality&Technical Supervision,Shenzhen 518000,China)

机构地区：[1]深圳市质量技术监督评价事务所,深圳518000

出　　处：《理化检验（物理分册）》2022年第6期54-57,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某承压蒸汽锅炉检修时发现其烟管端头处出现大量裂纹,采用宏观观察、扫描电镜分析,以及热力计算和结构设计校核对烟管开裂原因进行了分析。结果表明:烟管端头部位温度过高导致热疲劳开裂;锅炉结构存在严重的设计问题,锅炉炉胆长度太短,燃烧器与炉膛实际结构不匹配,造成回燃室和烟管端头位置温度过高。A large number of cracks appeared at the end of the flue pipe of a pressurized steam boiler.The reasons for the cracking of the flue pipe were analyzed by macroscopic observation,scanning electron microscopy analysis,thermal calculation and structural design check.The results show that the high temperature at the end of the flue tube led to thermal fatigue cracking.There were serious design problems in the boiler structure.The length of the boiler furnace was too short,and the burner did not match the actual structure of the furnace,resulting in high temperature at the end of the combustion chamber and the flue pipe.

关 键 词：烟管 热力计算 结构设计校核 疲劳裂纹 

分 类 号：TK228[动力工程及工程热物理—动力机械及工程]