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

作　　者：黄刚华 陈世明[4] 江晶晶[1,2,3] 杨爽 彭银华[6] 蒋军锋 HUANG Ganghua;CHEN Shiming;JIANG Jingjing;YANG Shuang;PENG Yinhua;JIANG Junfeng(Research Institute of Natural Gas Technology,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan,China;National Energy R&D Center of High Sulfur Gas Exploitation,Chengdu,Sichuan,China;High Sulfur Gas Exploitation Pilot Test Center,CNPC,Chengdu,Sichuan,China;PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan,China;Natural Gas Purification Plant General,PetroChina Southwest Oil&Gasfield Company,Chongqing,China;Central Sichuan Oil and Gas District,PetroChina Southwest Oil&Gasfield Company,Nanchong,Sichuan,China)

机构地区：[1]中国石油西南油气田公司天然气研究院 [2]国家能源高含硫气藏开采研发中心 [3]中国石油天然气集团公司高含硫气藏开采先导试验基地 [4]中国石油西南油气田公司 [5]中国石油西南油气田公司天然气净化总厂 [6]中国石油西南油气田公司川中油气矿

出　　处：《石油与天然气化工》2024年第3期8-13,共6页Chemical engineering of oil & gas

基　　金：中国石油集团公司重大科技专项课题“CCUS注采工艺、产出气循环利用及高效防腐关键技术研究”(2021ZZ01-04)。

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。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 S31254 

分 类 号：X74[环境科学与工程—环境工程]