氯离子对316L在FCC烟气氨法脱硫环境中腐蚀的影响研究  

Impact research of chloride ions on 316L corrosion in FCC flue gas ammonia desulfurization environment

作　　者：张若曦 刘旭霞 任重 刘希武 ZHANG Ruoxi;LIU Xuxia;REN Zhong;LIU Xiwu(SINOPEC Engineering Group Luoyang R&D Center of Technology,Luoyang 471003,China)

机构地区：[1]中石化炼化工程(集团)股份有限公司洛阳技术研发中心,河南洛阳471003

出　　处：《石油化工腐蚀与防护》2024年第4期20-25,共6页Corrosion & Protection In Petrochemical Industry

基　　金：中石化科技开发项目“FCC烟气脱硫脱硝远程诊断技术开发”(20115A150)。

摘　　要：催化裂化烟气氨法脱硫装置吸收塔浓缩段、吸收段和氧化段中存在氯离子浓度高的腐蚀介质,会导致较为严重的腐蚀问题,影响装置的长周期运行。该文采用电化学和浸泡试验的方法,考察了316L不锈钢在模拟工况下的耐缝隙腐蚀、点蚀和均匀腐蚀性能,确定了316L不锈钢在该环境下的氯离子浓度适用范围。研究结果表明:对于吸收段和氧化段(不超过60℃)与浓缩段(不超过65℃),氯离子质量分数标准边界为11000μg/g,极限边界为14000μg/g。There are corrosive medium with high-concentration chloride ions in concentration section,absorption section and oxidation section of absorption tower in FCC flue gas ammonia desulfurization unit.The existence of chloride ions may cause serious corrosion problems and affect long-term operation of the unit.The methods of electrochemistry and immersion test were applied to investigate chink corrosion resistance,pitting corrosion and uniform corrosion of 316L under simulated working condition.Applicable range of chloride ion concentration for 316L was determined.The studies indicated that for absorption section,oxidation section(≤60℃),and concentration section(≤65℃),the standard boundary for chloride ion concentration is 11000μg/g,and its limit boundary is 14000μg/g.

关 键 词：烟气脱硫 316L不锈钢 氯离子腐蚀 硫酸铵腐蚀 

分 类 号：TE986[石油与天然气工程—石油机械设备]