苯-甲苯-二甲苯物系热偶精馏过程节能效果的模拟优化  

Simulation and optimization of energy efficiency for thermally coupled distillation process in benzene-toluene-xylene system

作　　者：李瑞端[1] 张薇 戴传波[1] 杨莹[1] 杨家军[1] 

机构地区：[1]吉林化工学院,吉林吉林132022 [2]吉林石化工程学校,吉林吉林132022

出　　处：《现代化工》2017年第7期184-186,共3页Modern Chemical Industry

基　　金：国家自然科学基金项目(20776059)

摘　　要：以苯-甲苯-二甲苯精馏的MESH方程组为基础,用proⅡ模拟软件模拟,考察苯-甲苯-二甲苯物系组成对节能率的影响,并找出产品纯度对连接流股流量变化的灵敏度,在L/V'为1.5时,塔顶、塔中、塔釜产品均达到最佳条件,在保证L/V'最优前提下,以年费用即操作费用与设备折旧费用之和最小为目标函数,调节回流比及理论板数,优化苯-甲苯-二甲苯分离工艺,得出最优设计方案。结果表明,经优化设计的苯-甲苯-二甲苯物系的热偶精馏工艺比最好的普通精馏工艺节约能耗近40%。Based on MESH equation set of benzene-toluene-xylene distillation,stimulation is carried out by proⅡsoftware to evaluate the effects of benzene-toluene-xylene composition on the energy efficiency and to find out the sensitivity of product purity to the changes of flow rate of cycle streams. When the value of L/V＇ is 1. 5,purities of products at column top,mid-column and column bottom are all at their best. The optimal design scheme is obtained through adjusting reflux ratio and theoretical plate number,and optimizing the separation process of benzene-toluenexylene by aiming at minimum of annual operation cost and equipment depreciation in the premise of optimal L/V＇. The results show that energy consumption of the optimized thermally coupled distillation process for benzene-toluene-xylene system is nearly 40% of that of common distillation process.

关 键 词：甲苯 二甲苯 热偶精馏 模拟 设计 

分 类 号：TQ028[化学工程]