Simulation of Multicomponent Separation Processes in Steady and Unsteady State Operations

多组分分离过程（如蒸馏和气体吸收）的计算机辅助设计（CAD）和仿真通常是在使用平衡级概念对系统建模的基础上进行的。每个塔内级的方程与代表再沸器和/或冷凝器的方程同时求解，并规定了产率、最小/最高允许温度和压力、蒸汽和液体流速等约束条件。PI计划通过对工业设施中的瞬态条件进行建模，并包括对任意连接的多列的处理，从而扩展CAD能力，使其包括更现实的情况。具体研究计划包括：(1)基于基本质量和能量平衡的瞬态多组分分离过程建模；(2)在设计时考虑托盘液压（包括渗水和夹带）；(3)用数值方法求解得到的动力学方程，并与已发表的实验数据进行比较。结果应有助于开发启动和控制策略的各种柱，包括低持有填料柱，这是特别感兴趣的工业。

Computer aided design (CAD) and simulation of multicomponent separation processes such as distillation and gas absorption have been usually done based on modelling the system using the equilibrium stage concept. The equations for each interior stage of a column are solved simultaneously with those representing the reboiler and/or condenser, with the constraints specified on yield, minimun/maximum permissible temperatures and pressures, vapor and liquid flow rates, etc. The PI plans to increase CAD capability by extending it to include the more realistic situations that exist in industrial facilities by modelling transient conditions as well as including treatment of arbitrarily linked multiple columns. The specific research planned consists of (1) modelling transient multicomponent separation processes based on fundamental mass and energy balances; (2) incorporating tray hydraulics (including weeping and entrainment) in the design considerations; and (3) solving the resulting dynamic equations by numerical methods and comparing the results with published experimental data. The results should help in the development of start-up and control strategies for columns of all kinds including low hold up packed columns which are of special interest to industry.