侧线精馏塔高效分离二甲醚-甲醇-水的稳态模拟与动态控制研究

Steady-state simulation and dynamic control for efficient separation of dimethyl ether-methanol-water in sidestream distillation column

利用Aspen Plus模拟软件对二甲醚-甲醇-水分离过程中的侧线精馏塔进行稳态研究,在设计规定下对侧线精馏塔的设计与操作参数进行确定与优化,最终获得侧线精馏塔的理论板数为52块,最佳进料位置为第32块塔板,侧线出料位置为第12块塔板,回流比为41,灵敏板为第3块塔板。通过Aspen Dynamics考察了进料流量扰动(±5%)和进料组成扰动(±5%)的工况下,侧线精馏塔采出的产品纯度、灵敏板温度、采出量、再沸器热负荷等参数均可达到平衡,恢复至设定值,模拟结果说明侧线精馏塔的控制方案有效可行。

The steady state of sidestream distillation column in separation of dimethyl ether-methanol-water is studied by using Aspen Plus simulation software. Given design specifications,the design and operation parameters for sidestream distillation column are determined and optimized. The optimal results for sidestream distillation column are obtained as follows： the number of theoretical plates is 52,the optimal feed position is on the 32 rd plate,the sidestream withdrawing position is on the 12 th plate,the reflux ratio is 41 and the sensitive plate is the 3 rd plate.Under the operation conditions that both the feed flow disturbance and the feed composition disturbance are ±5%,it is investigated by Aspen Dynamics that the product purity,the temperature of sensitive plate,the withdrawing amount of product,the heat load of reboiler and other parameters all can be balanced to return back to the set value.The simulation results illustrate that the control program for sidestream distillation column is effective and feasible.