氨合成废热锅炉换热管应力腐蚀开裂分析  

Stress Corrosion Cracking Analysis of Heat Exchange Tubes in the Heat-recovery Boiler for Ammonia Synthesis

作　　者：徐书根[1] 王威强[1] 张强[1] 李梦丽[1] 宋明大[1] 

机构地区：[1]山东大学机械工程学院

出　　处：《压力容器》2008年第3期41-45,共5页Pressure Vessel Technology

基　　金：山东省2006年科学技术发展计划资助项目(2006GG3210006)

摘　　要：为了调查氨合成废热锅炉管束泄漏的原因,对失效的不锈钢换热管中裂纹宏观形貌、金相组织、管材化学成分和腐蚀产物成分,以及换热管运行环境进行了综合分析。结果表明,换热管开裂的性质为高温水中Cl-引起的不锈钢应力腐蚀,并提出了相应的预防措施。The comprehensive failure analysis was taken to investigate the leakage initiation of heat exchange tubers in the heat - recovery boiler for ammonia synthesis. The micro appearance of cracks in tubes, metallographic structure, chemical composition of the tube material and the corrosion products were analyzed. The operation conditions of the heat exchange tube were also illuminated. The results shows that the stress corrosion cracking（SCC） ,which induced by the Cl^- in high temperature water in the boiler, resulted in the leakage of tubes. The prevention method was proposed for this equipment.

关 键 词：应力腐蚀开裂 不锈钢换热管 1CRL8NI9TI 废热锅炉 

分 类 号：TK224.9[动力工程及工程热物理—动力机械及工程] TQ113.2[化学工程—无机化工]