硫黄回收装置末级硫冷凝器失效分析  

Failure Analysis of Final Sulfur Condenser in Sulfur Recovery Unit

作　　者：杨春天 郭志军 马一鸣 尹依娜 汪沈阳 张杰 YANG Chuntian;GUO Zhijun;MA Yiming;YIN Yina;WANG Shenyang;ZHANG Jie(Shanghai Lanbin Petrochemical Equipment Co.,Ltd.,Shanghai 201518,China;Machinery Industry Shanghai Lanya Petrochemical Equipment Testing Co.,Ltd.,Shanghai 201518,China;Research Institute of Petroleum Engineering Technology,SINOPEC Zhongyuan Oilfield Company,Puyang 457000,China)

机构地区：[1]上海蓝滨石化设备有限责任公司,上海201518 [2]机械工业上海蓝亚石化设备检测所有限公司,上海201518 [3]中国石油化工股份有限公司中原油田分公司石油工程技术研究院,河南濮阳457000

出　　处：《石油化工腐蚀与防护》2021年第2期48-52,共5页Corrosion & Protection In Petrochemical Industry

基　　金：国家科技重大专项子课题(2016ZX05017-006)。

摘　　要：针对末级硫冷凝器的失效泄漏问题,在管板、换热管和管头焊缝等不同部位取样,采用多种手段进行检测分析。根据宏观检查、剖面分析、金相组织分析和腐蚀产物分析等结果进行判断,设备失效泄漏主要是由换热管管头焊缝腐蚀穿孔所造成的。由于管头存在大量的焊接缺陷,在硫酸露点腐蚀和应力腐蚀的共同作用下,加速管头腐蚀穿孔,管头焊缝出现泄漏。建议对管头结构进行优化设计,开展管头焊接工艺研究,提高管头的焊接质量。Failure and leakage analysis was made on the samples taken from tube sheet,heat exchanger tube and tube head weld in final sulfur condenser.According to the results of macroscopic examination,profile analysis,metallographic structure analysis and corrosion product analysis,it was concluded that the equipment failure and leakage was mainly caused by weld corrosion perforation of heat exchange tube head.Due to a large number of welding defects in the tube head,under the combined action of sulfuric acid dew point corrosion and stress corrosion,the corrosion perforation of the tube head was accelerated,which leaded to the leakage of the tube head weld.Suggestions were offered on tube head,such as optimizing the structure,performing research on the welding process,improving the welding quality.

关 键 词：末级硫冷凝器 失效分析 焊缝泄漏 管头结构 腐蚀 

分 类 号：TQ125.11[化学工程—无机化工]