压力容器2025，Vol.42Issue(1)：69-77,9.DOI:10.3969/j.issn.1001-4837.2025.01.009
硫回收单元酸性水汽提塔腐蚀与防护探讨
Discussion on corrosion and protection of sour water stripper in the sulphur recovery unit
摘要
Abstract
Facing the problem of frequent corrosion perforation leaks occurred in the sour water stripper of a company's sulphur recovery unit during operation,a detailed inspection was carried out during the overhaul.It was found that the inner surface of the stripper was covered by a layer of blue corrosion products,and in addition to the tower wall,serious corrosion had occurred in the components such as the drop tube,anti-punching plate and tower disc.The macro-morphological,micro-structural and physical composition analysis of the failed sample were carried out.The results show that the corroded surface is strewn with corrosion pits with streamlined contours,and several small holes with a diameter of about 0.5 mm are found.A large number of non-metallic elements are detected on the corroded surface,with more than 30%of nitrogen element.The main composition of the corrosion products is Fe4[Fe(CN)6]3 and FeS.The type of corrosion occurring in the stripper is electrochemical corrosion and flow-accelerated corrosion.The electrochemical corrosion caused by H2S,HCN,HCOOH and other components in the feed is an important causative factor for failure of the stripper.The high velocity gas-liquid two phase flow is a decisive factor for failure due to the violent erosion of the overflow surface.Measures such as reducing the operating load of the stripper,strengthening the stability of the feed and upgrading the materials of key parts can reduce the corrosion risk of the stripper and ensure the safe and smooth operation of the plant.关键词
酸性水汽提塔/泄漏/腐蚀分析/腐蚀防护Key words
sour water stripper/leakage/corrosion analysis/corrosion protection分类
机械制造引用本文复制引用
苏国庆,李彦,张建文,张志军..硫回收单元酸性水汽提塔腐蚀与防护探讨[J].压力容器,2025,42(1):69-77,9.基金项目
国家重点研发计划项目(2021YFB3301100) （2021YFB3301100）
北京化工大学交叉学科项目(XK2023-07) （XK2023-07）
