三组元全热耦合精馏过程的模拟计算

Simulation and calculation of the fully thermally coupled distillation columns for ternary mixture separation

本文利用Aspen软件对三组分进料全热耦合精馏的分离流程进行设计和模拟,建立了相应的具体计算步骤。首先利用三塔模型把热耦合精馏过程简化为3个单独的简单清晰分割塔,通过简捷法设计和模拟得到塔板数和回流比等初值后进行严格法模拟,得到热耦合精馏的数据和操作条件。然后采用Aspen软件中的RadFrac模型,将三塔模型的模拟初值代入全热耦合模块进行严格模拟。结果表明,采用全热耦合精馏分离C4三组分比传统精馏的直接序列和间接序列节能约为20%。

With the application of Aspen Plus software, a design and simulation were performed to the fully thermally coupled distillation columns for ternary C4 hydrocarbon mixture separation, and established the corresponding calculation steps. The design procedure was given： First fully thermally coupled distillation columns is simplified into three simple clear separation tower by using of three-tower model. In this step, the plate number and reflux ratio were obtained by simple method of design and simulation. After the initial value and operating conditions were obtaind, using RadFrac model of Aspen software to complete a rigorous simulation. As rigorous simulation was employed. The results show that the fully thermally coupled distillation columns can reduce about 20% energy consumption and capital investment comparing to conventional distillation consequences for separation of ternary-components C4 hydrocarbon mixture.