直序双塔精馏分离BTX过程的稳态模拟与动态控制研究

摘要

利用Aspen Plus模拟软件对BTX直接序列双塔精馏过程进行稳态研究,在设计规定下分别对苯塔和甲苯塔的操作参数进行确定和优化,确定了各塔的理论塔板数、最佳进料位置、回流比以及灵敏板温度.在稳态模拟设计数据的基础上,采用Aspen Dynamics考察了进料流量扰动(±10%)和进料组成扰动(±10%)的工况下,各项控制指标均可在较短响应时间内达到平衡,动态控制结构可以很好地应对工艺过程中进料流量和进料组分的扰动.%The direct sequence two column distillation BTX process based on Aspen Plus was studied.In design specification,the design and optimal parameters of benzene column and toluene column were determined and optimized,in which the theoretical number of stages,the optimum feed stage,the reflux ratio and the sensitive stage were determined. Based on the steady-state simulation of designed data,the feed flow disturbance(±10%)and feed composition disturbance(±10%)were investigated by Aspen Dynamics,and control index parameters could be balanced to return in a short time. The dynamic simulation showed that the control structure provided the effective control of product purity for disturbance of feed rate and composition.