减压塔底1#泵出口阀后偏心异径接头穿孔原因分析  

Perforation Analysis of Rear Eccentric Reducing Joint for Outlet Valve of Decompression Tower Bottom Pump

作　　者：郑孝军[1,2] 刘会军 ZHENG Xiaojun;LIU Huijun(Liaoyang Petrochmical Company,Petro China Company Limited,Liaoyang 111003,China;Laborature for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]中国石油天然气股份有限公司辽阳石化分公司,辽阳111003 [2]中国科学院金属研究所金属腐蚀与防护实验室,沈阳110016

出　　处：《腐蚀科学与防护技术》2019年第6期631-636,共6页Corrosion Science and Protection Technology

摘　　要：针对某炼油厂减压塔底1#泵出口阀后偏心异径接头穿孔泄漏事故,采用化学分析、金相、扫描电镜、能谱等技术对该偏心异径接头的化学成分、金相组织、穿孔部位接头内壁腐蚀破坏状态进行了检验分析。结果表明,渣油中硫元素引起的高温腐蚀与渣油流体的冲刷是造成该偏心异径接头管壁腐蚀减薄、直至穿孔的主要原因。Aiming at the leakage accident caused by perforation of rear eccentric reducing joint for the outlet valve of decompression tower bottom pump No.1 in an oil refinery,the chemical composition,microstructure and corrosion damage of the inner wall of the joint in the vicinity of the perforation site have been examined by means of chemical analysis,metallographic microscope,SEM and EDX.The results show that the synergistic action of the high temperature corrosion caused by sulfur in residual oil and the erosion of the residual oil fluid gives rise to the wall thickness reduction and finally the perforation of the eccentric reducing joint.

关 键 词：减压塔 渣油 偏心异径接头 1Cr5Mo钢 冲刷腐蚀 

分 类 号：TG172.5[金属学及工艺—金属表面处理]