Simulation of Multicomponent Separation Processes in Steady and Unsteady State Operations

多部件计算机辅助设计与仿真 分离过程如蒸馏和气体吸收已经 通常基于使用平衡阶段对系统进行建模来完成 概念. 求解了塔内各级的方程组 与代表再沸器和/或冷凝器的那些同时， 在规定的产量、最小/最大允许产量限制条件下， 温度和压力、蒸气和液体流速等。PI 计划通过扩展计算机辅助设计能力， 通过模拟工业设施中存在的现实情况 瞬态条件以及包括任意 链接多个列。 计划的具体研究包括：（1）瞬态建模 基于基本质量的多组分分离方法， 能量平衡;（2）结合塔盘水力学（包括漏液 和夹带）的设计考虑;（3）解决 所得的动力学方程的数值方法和比较， 结果与已发表的实验数据一致。 结果应该有助于 开发所有色谱柱的启动和控制策略， 包括低持液量填料塔， 对工业的兴趣。

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.