换热管的泄漏原因分析  

Causes analysis for leakage of heat exchange tubes

作　　者：马瑞东 叶智 谢金鹏[2,3] 钟振前 赵睿[2,3] MA Ruidong;YE Zhi;XIE Jinpeng;ZHONG Zhenqian;ZHAO Rui(Huadian Shaanxi Energy Co.,Ltd.,Xi'an 710016,China;Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;NCS Testing Technology Co.,Ltd.,Beijing 100081,China)

机构地区：[1]华电陕西能源有限公司,陕西西安710016 [2]钢铁研究总院有限公司,北京100081 [3]钢研纳克检测技术股份有限公司,北京100081

出　　处：《物理测试》2024年第6期51-56,共6页Physics Examination and Testing

摘　　要：某精馏反歧化二级塔塔顶冷凝器在服役过程中换热器发现多根列管存在泄露。为了确定失效原因,防止此类失效事件再次发生,对列管的化学成分、力学性能、金相组织和微观形貌进行了分析,确定了泄露原因。结果表明,换热管发生严重的均匀腐蚀和局部点腐蚀穿孔,导致管道泄露,且腐蚀形貌具有微生物腐蚀特征。同时,换热管中存在大尺寸非金属夹杂物会促进管壁形成点蚀穿孔的进程。The leaking of some tubes in heat exchanger was observed in a secondary tower′s top condenser in one certain distillation deisobutanizer.In order to find out the failure cause and prevent the similar incidents from recurring,the chemical composition,mechanical properties,metallographic structure,and microscopic morphology of the tubes were analyzed to identify the reasons for leaking.The results showed that the heat exchanger tubes had a serious uniform corrosion and local point corrosion perforation,leading to the leaking of tubes.Moreover,the corrosion morphology had the characteristics of microbiological corrosion.Meanwhile,the large size nonmetallic inclusions in heat exchanger tubes accelerated the process of point corrosion perforation of tube wall.

关 键 词：换热器 10#钢 均匀腐蚀 

分 类 号：TQ051.5[化学工程]