摘要
芳烃抽提装置是芳烃分离常用工艺,受工艺条件和设备等多种因素影响,系统中溶剂劣化对生产设备腐蚀严重。金陵分公司II芳烃抽提装置频繁发生换热器、塔壁、溶剂管线等泄漏,迫使抽提单元多次非计划停工,影响了装置长周期运行。通过对环丁砜溶剂系统和腐蚀部位进行研究分析,找出导致快速腐蚀的根本原因,实施了严格控制抽提系统操作温度和真空度,加强监测进料氯含量,及时更换液相脱氯剂,定期用除盐水置换水洗水,增设溶剂在线净化设施等措施,有效减缓了环丁砜溶剂的降解速率,优化了设备管线的运行环境,使抽提装置腐蚀泄漏频次降至最低,延长了装置平稳运转周期。
Aromatics extraction unit is a common device in aromatics separation unit.Influenced by many factors such as process conditions and equipment,solvent deterioration in the system often leads to serious corrosion of production equipment.Leakages in heat exchanger,tower wall and solvent pipeline frequently occurred in aromatics extraction unit II in Jinling Petrochemical Company,which forced the extraction unit to shut down several times to deal with leaks,affecting the long-term operation and economic benefits of the unit.Based on the analysis of sulfolane solvent system and corrosive parts,the fundamental causes leading to rapid corrosion were found out from key leak points.Measures such as strictly controlling the operating temperature and vacuum degree of extraction system,strengthening the monitoring of chlorine content in feed,timely replacing liquid dechlorinating agent,periodically replacing water washing with desalted water and adding online purification facilities for solvent were put forward for this system.Targeted protective measures in process operation and maintenance management can effectively slow down the degradation rate of sulfolane solvents,optimize the operation environment of the equipment and pipelines,minimize the corrosion leakage frequency of extraction unit and prolong the stable operation period of the unit.
作者
宋彩芬
Song Caifen(Sinopec Jinling Company,Nanjing Jiangsu 210033,China)
出处
《石油石化绿色低碳》
2019年第6期36-39,共4页
Green Petroleum & Petrochemicals
关键词
芳烃抽提单元
腐蚀泄漏
措施
aromatics extraction unit
corrosion and leakage
measures
