合成氨装置脱氧器/酸气气提器材料的失效原因分析
Failure Cause Analyses on the Material of Deaerator/Surgas Stripper in Synthetic Ammonia Installation
摘 要
某化肥厂合成氨装置中的脱氧器/酸气气提器筒体泄露.对该筒体材料的成分、显微组织、腐蚀状况、裂纹及断口进行了分析.结果表明,该筒体材质为316L不锈钢,失效的原因是Cl-在筒体内局部富集发生点蚀,进而引发材料的应力腐蚀开裂.此外筒体内的酸性介质H2S、CO2、HCOOH和CO、O2等加速了应力腐蚀裂纹的扩展.鉴于本工艺条件,建议对设备材料进行升级.
点蚀
应力腐蚀
austenitic stainless steel
leakage
pitting
stress corrosion
Abstract
For the leakage accident in the cylindrical shell′s material of the deaerator/sourgas stripper in the synthetic ammonia equipmeut,the chemical composition,microstructure,corrosion condition,crack and fracture of the cylindrical shell′s material were analyzed.The results show that the material of the cylindrical shell is 316L stainless steel,and the failure of the material was due to stress corrosion cracking which was induced by the regional enrichment of Cl- in the cylindrical shell to cause pitting consequently.Besides,the acid media,such as H2S,CO2,HCOOH and CO,O2 in the cylindrical shell had accelerated the propagation of stress corrosion cracking.A corresponding improvement measure of using duplex stainless steel is suggested.
中图分类号 TG174.9
所属栏目 腐蚀失效分析
基金项目
收稿日期 2009/9/7
修改稿日期 2009/9/25
网络出版日期
作者单位点击查看
联系人作者金光熙(jgx1964@163.com)
备注金光熙,教授.
引用该论文: LU Wei,JIN Guang-xi,XU Dan,XU Guang-yuan,WU Yan-shi. Failure Cause Analyses on the Material of Deaerator/Surgas Stripper in Synthetic Ammonia Installation[J]. Corrosion & Protection, 2010, 31(7): 570～573
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参考文献
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【4】罗纯东.奥氏体不锈钢锅炉体应力腐蚀开裂失效分析[J].石油化工设备,2007,36(1):99-100.
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