换热器不锈钢换热管束开裂原因分析  

Analysis of Cracking Reasons of Stainless Steel Heat Exchanger Bundles in Heat Exchangers

作　　者：糜亮[1] 陈骏[1] 潘安霞 Mi Liang;Chen Jun;Pan Anxia(Special Equipment Safety Supervision Inspection Institute of Jiangsu Province,Yangzhou 225002;Crrc Qishuyan Institute Co.,Ltd,Changzhou 213025)

机构地区：[1]江苏省特种设备安全监督检验研究院扬州分院,扬州225002 [2]中车戚墅堰机车车辆工艺研究所有限公司,常州213025

出　　处：《中国特种设备安全》2020年第3期57-61,共5页China Special Equipment Safety

摘　　要：一台换热器换热管束发生了开裂泄漏.采取全面检验的方式,通过宏观检查、化学成分分析、断口微观形貌和能谱分析、金相分析等方法,对换热管开裂原因进行了分析.结果表明:该换热管开裂为氯化物应力腐蚀开裂.壳程介质循环冷却水中CI元素含量是应力腐蚀开裂的主要因素,结构缺陷、敏感的工作温度区间、水中溶解氧和含S杂质导致了应力腐蚀的快速发展.A heat exchanger tube bundle cracked and leaked.Adopting the comprehensive inspection method,the cracking property and reasons of the heat exchange tubes were analyzed,by means of macro analysis,chemical composition analysis,fracture analysis,energy spectrum analysis,metallographic analysis and so on.The results show that the cracking of the heat exchanger tube is chloride stress corrosion cracking,and the content of chloride ion in shell-side medium circulating cooling water is the main factor of stress corrosion cracking.Structural defects,sensitive working temperature range,dissolved oxygen and S-containing impurities in water lead to the rapid development of stress corrosion.

关 键 词：不锈钢换热管 应力腐蚀 氯化物 

分 类 号：X933.4[环境科学与工程—安全科学]