制氢装置酸性水汽提塔壁开裂的原因
Cracking Reason of Acid Water Stripping Tower in Hydrogen Production Unit
摘 要
通过系统分析某炼化企业制氢装置酸性水汽提塔开裂部位断口的宏观/微观形貌、受力状况、材质化学成分、金相组织及断口特征,结合汽提塔内部工况条件、介质组成,以及外部保温材料类型及污染物含量,确定制氢汽提塔开裂失效原因是外壁保温结构滞留水分,造成保温材料中的可溶性氯化物在S30408不锈钢表面不断浓缩,同时在拉应力的共同作用下,导致塔壁从外部发生了氯化物应力腐蚀开裂。建议从优化保温结构设计和保温材料选型,采取防腐涂层保护措施,以及加强施工质量管理等方面,对以上腐蚀开裂问题进行有效控制。
氯离子
保温层
应力腐蚀开裂
S30408 stainless steel
Cl-
insulation layer
stress corrosion cracking
Abstract
The cracking part of acidic water stripping tower in hydrogen production unit of a refining enterprise was systematically analyzed by macro/micro morphology, stress condition, material chemical composition, metallographic structure and fracture characteristics. At the same time, the working conditions inside the stripping tower, the composition of the medium, the types of external insulation materials and the content of pollutants were combined to the above. The results showed that the cracking of stripping tower was due to the water retention in the outer wall insulation, which led to a continuous concentration of soluble chloride in the insulation material on the surface of S30408 stainless steel. Meanwhile, the stainless steel suffered chloride stress corrosion cracking from the outside of the tower. It is suggested to optimize the insulation structure design and insulation material selection, strengthen construction management of insulation structure, and apply anti-corrosion coating to avoid the corrosion and cracking.
中图分类号 TG175 DOI 10.11973/fsyfh-202301019
所属栏目 失效分析
基金项目 中石化集团公司科技开发项目(CLY19117)
收稿日期 2020/11/16
修改稿日期
网络出版日期
作者单位点击查看
引用该论文: LI Xiaowei,SONG Yanda,WANG Xuefeng,ZHANG Xiaojian,DUAN Yongfeng. Cracking Reason of Acid Water Stripping Tower in Hydrogen Production Unit[J]. Corrosion & Protection, 2023, 44(1): 102
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