催化裂化烟气湿法脱硫装置的腐蚀问题及防护对策  

Corrosion Problems and Protective Measures of FCC Wet Flue Gas Desulfurization Device

作　　者：许兰飞 刘希武 崔新安 XU Lanfei;LIU Xiwu;CUI Xinan(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洛阳技术研发中心,洛阳471003

出　　处：《腐蚀与防护》2021年第1期73-78,共6页Corrosion & Protection

基　　金：中国石化集团科技开发项目(315018)。

摘　　要：近年来,中国石化多家炼化企业的催化裂化烟气湿法脱硫装置出现了严重的腐蚀问题,为减轻设备腐蚀、保证装置安全稳定长周期运行,对多套催化裂化烟气湿法脱硫装置进行腐蚀调查,针对不同腐蚀区域设备、塔器及内构件的实际腐蚀问题进行了系统分析,结合装置现场腐蚀挂片和实验室腐蚀评价研究,从材料选择、工艺和施工质量控制三方面提出防护对策。结果表明:催化裂化烟气湿法脱硫装置存在五个不同的腐蚀环境,需根据不同区域的腐蚀特性,选择合适的防腐蚀材料;湿法脱硫系统设备易发生腐蚀的部位主要为塔器、烟囱、塔内构件和泵叶轮等。The catalytic cracking flue gas wet desulfurization units of several Sinopec′s petrochemical enterprises experienced serious corrosion problems in recent years.In order to reduce equipment corrosion and make it operate long term and properly,the corrosion of several sets of catalytic cracking flue gas wet desulfurization equipment was investigated,and the actual corrosion problems of equipment,towers and internal components in different corrosion areas were systematically analyzed.Combined with the results of the on site corrosion coupon testing and laboratory corrosion evaluation research,protective countermeasures were proposed from three aspects:material selection,process and construction quality control.The results show that there were five different corrosive environments in the FCC wet flue gas desulfurization device,and it was necessary to select suitable anti-corrosion materials according to the corrosion characteristics of different areas.The corrosion-prone parts of wet desulfurization system equipment were mainly towers,chimneys,tower internals and pump impellers.

关 键 词：催化裂化 湿法脱硫 腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]