乙烯裂解炉原料预热盘管段腐蚀泄漏原因分析  

CAUSE ANALYSIS OF CORROSION LEAKAGE IN PREHEATING COIL SECTION OF ETHY-LENE CRACKING FURNACE

作　　者：代广平 赵爱利 Dai Guangping;Zhao Aili(Shenghong Refining and Chemical(Lianyungang)Co.,Ltd.,Lian-yungang,Jiangsu,22200)

机构地区：[1]盛虹炼化(连云港)有限公司,江苏连云港222000

出　　处：《石油化工设备技术》2024年第6期60-66,I0004,共8页Petrochemical Equipment Technology

摘　　要：裂解原料预热管段与预热盘管的连接段采用异种钢焊接,生产过程中,轻烃介质裂解炉先后发生腐蚀泄漏。为了找出管道腐蚀失效泄漏原因、彻底解决问题,通过宏观检查、化学成分分析、硬度检测和微观电镜扫描,同时结合腐蚀产物成分,对发生泄漏的管段进行了失效分析。分析认为,生产过程中该管段由于工况变化形成的异种钢电偶腐蚀是造成腐蚀泄漏的根本原因。针对上述原因,提出了相应的解决办法,并采用这些方法对其中3台裂解炉进行了改进。目前,3台裂解炉运行效果良好,未再发现腐蚀泄漏问题。Dissimilar steel is used to weld the connection between the preheating pipe segment of cracking raw materials and the preheating coil.In the production process,corrosion leakage occurs successively in the cracking furnace for light hydrocarbon medium.In order to find out the causes of pipeline corrosion failure and leakage and to solve the problem completely,the failure analysis of the pipeline section where leakage occurs is carried out through macroscopic inspection,chemical composition analysis,hardness test and microscopic electron microscope scanning combining with the composition of corrosion products.According to the analysis,the galvanic corrosion of dissimilar steel formed in this pipe section due to changes in working conditions during the production process was the root cause of the corrosion leakage.Aiming at the above causes,corresponding solutions were proposed and these methods were adopted to improve three of the cracking furnaces.At present,the three cracking furnaces are operating well and no further corrosion leakage have been detected.

关 键 词：裂解炉 对流段 腐蚀 泄漏 

分 类 号：TQ221.211[化学工程—有机化工] TQ050.9