围绕芳烃生产过程节能降耗需求，采用Aspen模拟平台建立了二甲苯精馏单元、吸附分离单元、异构化单元机理模型，并以此为基础进行模拟仿真，提出了从二甲苯精馏塔侧线采出OX的工艺改进方案。在工业操作条件下，考察了二甲苯精馏塔不同塔板位置对侧线OX最大抽出量的影响规律，并获得最优采出位置和采出量；结合实际工业对象，分析了侧线抽出方案对吸附分离和异构化单元能耗的联动效应，并对芳烃全流程生产的经济性进行测算。结果表明，侧线抽出可直接减少13.25 t/h的大循环量，显著降低吸附分离单元能耗，同时也重新配置了精馏单元芳烃资源，降低了精馏单元内部能耗，为芳烃生产节能降耗提供了有益思路。

To save energy and cut down consumption in aromatics production process,Aspen simulation platform is utilized to establish mechanism models for the xylene distillation,adsorption separation and isomerization units in aromatics production process.Based on these models,simulation is performed and a process improvement scheme to extract o-xylene from the side-stream of xylene distillation tower is proposed.Under the industrial conditions,the influence rules of different tray positions for side-stream extracting on the maximum extraction amount of o-xylene are investigated,and the optimal extraction position and the maximum extraction amount are obtained.Combined with the actual industrial object,the effect of side-stream extraction scheme on energy consumption of both adsorption separation and isomerization units are analyzed,and the plant-wide economy of aromatics production process is calculated out.It is indicated that the side-stream extracting can directly reduce 13.25 t/h of the circulation,which significantly reduces the energy consumption in the adsorption separation unit.Simultaneously,the redistribution of aromatics resources can also reduce the internal energy consumption of distillation unit.These results provide a useful idea to save energy for aromatic production.

杨明磊(1985-),男,博士,副研究员,研究方向为系统工程,mlyang@ecust.edu.cn