压力容器2025，Vol.42Issue(3)：71-78,8.DOI:10.3969/j.issn.1001-4837.2025.03.009
低温甲醇洗装置换热器腐蚀泄漏原因分析
Analysis of corrosion and leakage causes in heat exchangers of low-temperature methanol washing units
摘要
Abstract
To analyze the corrosion and leakage causes in heat exchangers of low-temperature methanol washing unit,scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS)and X-ray diffraction(XRD)were used to examine the microstructure,elemental distribution,and phase composition of the failed tubes.X-ray fluorescence(XRF)was employed to determine the elemental content of sludge in the header.Additionally,corrosion simulation experiments were conducted to characterize the corrosive effects of sulfur-rich methanol on the heat exchanger material.Results showed that multiple corrosion perforations(maximum diameter:2.5 mm)existed in the failed tubes,with perforation walls nearly perpendicular and no abnormal thinning observed in surrounding areas.The corrosion products primarily consisted of iron-sulfur compounds,and significant sulfur-containing components were detected in the sludge.High temperature markedly accelerated material corrosion,with a corrosion rate reaching 0.138 mm/a at 80℃.During operation,partial desorption of H2S from sulfur-rich methanol formed an H2S-H2O electrochemical corrosion environment,leading to uniform thinning of the tubes.Under-deposit corrosion caused by sludge adhesion was identified as the primary cause of perforation.Measures such as adding corrosion and scale inhibitors and upgrading the heat exchanger material can mitigate corrosion risks and extend equipment service life.The research can provide theoretical basis and engineering reference for corrosion prevention and control of low-temperature methanol washing unit and heat exchanger selection.关键词
换热器/泄漏/腐蚀分析/H2S腐蚀/垢下腐蚀Key words
heat exchanger/leakage/corrosion analysis/H2S corrosion/under-deposit corrosion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..低温甲醇洗装置换热器腐蚀泄漏原因分析[J].压力容器,2025,42(3):71-78,8.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）
