先进控制技术在芳烃装置上的应用

The Application of Advanced Process Control Technology in Aromatic Unit

洛阳石化芳烃装置利用先进控制软件,并以人工经验为基础,采用定制开发的手段实现先进控制需求。整个先进控制系统按流程分为预分馏单元先进控制子系统、抽提单元先进控制子系统、歧化单元先进控制子系统、二甲苯单元先进控制子系统、吸附分离单元先进控制子系统、异构化单元先进控制子系统等6个相互独立的子系统,各子系统可以根据工艺条件和需要,用各自的切换开关单独投运或切除。经过近5个月的连续运行,实现了装置的平稳控制,各精馏塔关键工艺指标均比未投运前有了较大改善,平均波动幅度减小30%以上,三苯收率达到60.21%,比未投运期间提高了2.49%。同时,提高了芳烃装置各单元的综合自动化水平,系统投运率达到90%以上,降低劳动强度。先进控制技术投用后,产品综合能耗降低了1.75%,每年产生经济效益650.2万元。

Based on human experience,Sinopec Luoyang Company′s aromatic unit uses advanced process control software and customized approaches to meet the needs for advanced control.The entire advanced process control system consists of six independent subsystems—the advanced control subsystem for the prefractionation unit,the advanced control subsystem for the extraction unit,the advanced control subsystem for the dismutation unit,the advanced control subsystem for the xylene unit,the advanced control subsystem for the absorption and separation unit and the advanced control subsystem for the isomerization unit.Each system can be put into use or cut off with the use of their own selector switch based on process conditions and needs.After nearly five months of continuous operation,the unit achieved stable process control and all key technical indices for rectifying towers improved greatly compared with those prior to the start of operation of the advanced process control system.The average amplitude of fluctuation decreased by over 30%.The yield of benzene,toluene and xylene reached 60.21%,2.49% higher than that prior to the operation of this advanced control system.At the same time,the system helps improve the overall level of automation of all units of the aromatic unit.The uptime rate of the system exceeds 90% and the labor intensity is lower.After the advanced process control technology was introduced,the overall energy consumption in producing products has dropped by 1.75% and the annual economic benefits from the use of this technology reach 6.502 million yuan.