换热器应力腐蚀开裂失效分析  

Failure Analysis of Stress Corrosion Cracking of CO_(2) 2Heat Exchanger

作　　者：杨志刚 YANG Zhigang(The Boiler&Pressure Vessel Safety Inspection Institute of Henan Province,Zhengzhou 450016,China)

机构地区：[1]河南省锅炉压力容器检验技术科学研究院,河南郑州450016

出　　处：《盐科学与化工》2023年第9期35-38,共4页Journal of Salt Science and Chemical Industry

摘　　要：换热器在化工生产中应用十分广泛,发生应力腐蚀开裂是换热器损坏的一个重要原因。某化工厂的一台CO_(2)换热器在检验时,发现管程出口侧有多根换热管发生严重开裂。为查明开裂原因,对换热管进行了取样分析,采取化学成分分析、金相分析、扫描电镜分析和能谱分析等多种方法对试样进行了检测。基于裂纹的宏观形貌和试样的理化检测结果分析,得出换热管开裂的原因是换热管贴胀变形部位在湿硫化氢和氯化物环境下发生应力腐蚀开裂。为保证设备可靠运行,给出了相应的建议。Heat exchangers are widely used in chemical production.Stress corrosion cracking is an important reason for heat exchanger damage.During the inspection of a CO_(2) heat exchanger in a chemical plant,it was found that several heat exchange tubes at the outlet side of the tube pass were seriously cracked.In order to find out the cause of cracking,the author sampled and analyzed the heat exchange tube,and tested the sample by chemical composition analysis,metallographic analysis,scanning electron microscope analysis and energy spectrum analysis.Based on the macroscopic morphology of the crack and the analysis of the physical and chemical test results of the sample,the author concluded that the reason for the heat exchange tube cracking was that the stress corrosion cracking occurred at the expansion deformation part of the heat exchange tube in the wet hydrogen sulfide and chloride environment.In order to ensure the reliable operation of the equipment,corresponding suggestions were putted forward.

关 键 词：换热器 穿晶裂纹 湿硫化氢 氯化物 应力腐蚀开裂 

分 类 号：TQ050.9[化学工程]