催化裂化装置解吸塔底重沸器管裂纹失效的研究  

Research on Cracking Failure of Reboiler Tube at Bottom of Desorption Tower in RFCC Unit

作　　者：解慧敏 朱尧 韩英杰[1] 徐晓晨 XIE Hui-min;ZHU Yao;HAN Ying-jie;XV Xiao-chen(CNPC Fushun Petrochemical Company Refinery No.2,Fushun Liaoning 113004,China)

机构地区：[1]中国石油抚顺石化公司石油二厂,辽宁抚顺113004

出　　处：《当代化工》2022年第11期2687-2690,共4页Contemporary Chemical Industry

摘　　要：介绍170万t·a^(-1)重油催化裂化装置解吸塔底重沸器E-312管裂纹失效情况,通过制造文件查询、材质分析、压扁试验、弯曲试验、断口除锈前后的宏观腐蚀形貌观察、金相检验、扫描电镜、腐蚀产物能谱分析及腐蚀物来源等方面研究了催化装置解吸塔底重沸器腐蚀泄漏的原因。结果表明:管束发生开裂起源于外壁,其主要由于解吸塔底脱乙烷汽油中硫化物和氯应力腐蚀开裂造成,提出了针对性的材质升级和避免湿硫化氢环境腐蚀的整改措施,可为同类装置安全长周期生产防范腐蚀发生提供借鉴。The cracking failure of pipe of reboiler E-312 at bottom of desorption tower in 1.7 Mt·a^(-1) heavy oil catalytic cracking unit was introduced. The causes of corrosion leakage of the reboiler at the bottom of desorption tower in catalytic unit were studied from the aspects of macroscopic corrosion morphology observation, metallographic examination, scanning electron microscope, energy spectrum analysis of corrosion products and source of corrosion products before and after removal of rust. The results showed that the cracking of the tube bundle originated from the outer wall, which was mainly caused by the sulfide and chlorine stress corrosion cracking in the deethanized gasoline at the bottom of the desorption tower. The targeted material upgrading and rectification measures to avoid the corrosion in wet hydrogen sulfide environment were put forward. The paper can provide some reference for the safe and long-term production of similar units to prevent corrosion.

关 键 词：催化裂化 换热器 重沸器 腐蚀 

分 类 号：TE624[石油与天然气工程—油气加工工程]