尾气处理装置烟气加热器腐蚀失效原因分析
Cause analysis of corrosion failure in flue gas heater of tail gas treatment unit
黄刚华 1陈世明 2江晶晶 1杨爽 3彭银华 4蒋军锋3
作者信息
- 1. 中国石油西南油气田公司天然气研究院;国家能源高含硫气藏开采研发中心;中国石油天然气集团公司高含硫气藏开采先导试验基地
- 2. 中国石油西南油气田公司
- 3. 中国石油西南油气田公司天然气净化总厂
- 4. 中国石油西南油气田公司川中油气矿
- 折叠
摘要
目的 分析某天然气净化厂康索夫(Cansolv)尾气处理装置烟气加热器出现严重腐蚀失效的原因.方法 分析了烟气加热器管束的腐蚀环境,开展了材料理化性能、腐蚀产物成分及微观形貌等失效原因分析.结果 失效管束的理化性能符合要求,管束泄漏处呈坑状和蜂窝状,部分沟槽尖端有裂纹,且深入基体,呈现应力腐蚀的特征.结论 烟气加热器在高温、高酸液含量的环境下发生了电化学腐蚀和应力腐蚀,导致管束出现腐蚀泄漏.
Abstract
Objective The aim is to analyze the causes of serious corrosion failure of flue gas heater in Cansolv tail gas treatment unit of a natural gas purification plant.Methods The corrosion environment of the flue gas heater tube bundle was analyzed,and the failure reasons,such as the physical and chemical properties of the material,the composition of the corrosion products and the micro-morphology were analyzed.Results The physical and chemical properties of the failed tube bundle met the requirements.The leakage area of the tube bundle was pit-shaped and honeycomb-shaped,and some groove tips had cracks that penetrate deep into the substrate,exhibiting stress corrosion characteristics.Conclusions The electrochemical corrosion and stress corrosion occurred in the flue gas heater under high temperature and high acid content,resulting in corrosion leakage of the tube bundle.
关键词
Cansolv/尾气处理/腐蚀/烟气加热器/不锈钢/S31254Key words
Cansolv/tail gas treatment/corrosion/flue gas heater/stainless steel/S31254引用本文复制引用
基金项目
中国石油科技重大专项(2021ZZ01-04)
出版年
2024
国家科技期刊平台
NSTL
万方数据