丙烷脱氢装置产品气压缩机出口换热器管束腐蚀分析  

Analysis of Tube Bundle Corrosion in Heat Exchanger Outlet of Product Gas Compressor in Propane Dehydrogenation Unit

作　　者：刘晓成 郭海艳 陈义丰 叶道元 万亿青 张波杰 毕晓飞 邹继龙 赵伟宁 LIU Xiao-cheng;GUO Hai-yan;CHEN Yi-feng;YE Dao-yuan;WAN Yi-qing;ZHANG Bo-jie;BI Xiao-fei;ZOU Ji-long;ZHAO Wei-ning(Ningbo Kingfa Advanced Materials Co.,Ltd.,Ningbo,Zhejiang 315000,China;Sinopec Zhenhai Refining&Chemical Company,Ningbo,Zhejiang 315000,China)

机构地区：[1]宁波金发新材料有限公司,浙江宁波315000 [2]中国石油化工股份有限公司镇海炼化分公司,浙江宁波315000

出　　处：《浙江化工》2022年第7期30-36,共7页Zhejiang Chemical Industry

摘　　要：阐述丙烷脱氢装置产品气压缩机出口换热器管束腐蚀后对装置的影响,通过对换热器泄漏管束样品的宏观观察、化学分析、能谱、扫描电镜及运行工况分析,得出管束泄漏主要由产品气侧的化学腐蚀和氢腐蚀、循环水侧的缝隙腐蚀共同作用所致。针对研究结果优化运行条件:装置产品气侧降低反应器注硫量,监控产品气压缩机段间的氧含量,排查反应负压区的泄漏状况;循环水采用二氧化氯杀菌剂并降低循环水的pH值,减少缝隙腐蚀条件;采用牺牲阳极法减少基材电化学腐蚀;定期更换换热器管束,减小管束泄漏概率,维持装置长周期运行。In this paper,the influence of the corrosion of the tube bundle of the product gas compressor outlet of the propane dehydrogenation unit on the device is described.Through the macroscopic observation,chemical analysis,energy spectrum,scanning electron microscope and operating condition analysis of the leaking tube bundle samples of the heat exchanger,it is concluded that The tube bundle leakage is mainly caused by the combined action of chemical corrosion and hydrogen corrosion on the product gas side and crevice corrosion on the circulating water side.Optimize the operating conditions according to the research results:reduce the amount of sulfur injection in the reactor on the product gas side of the device,monitor the oxygen content between the product gas compressor sections,and check the leakage in the reaction negative pressure area.The circulating water uses chlorine dioxide bactericide and reduces the pH value of the circulating water to reduce crevice corrosion conditions.The electrochemical corrosion of the substrate is reduced by the sacrificial anode method.Regularly replace the heat exchanger tube bundles to reduce the probability of tube bundle leakage and maintain long-term operation of the device.

关 键 词：丙烷脱氢装置 换热器 管束腐蚀 氢腐蚀 硫化氢 缝隙腐蚀 泄漏 

分 类 号：TQ221.212[化学工程—有机化工]