【摘要】 本文将用于二元系精馏塔的分段及整体模拟的两个动态模型应用到分离苯-甲苯-乙苯混合物具有48块实际板的一个大型精馏塔上,回流比分别变化士5％,±10％;再沸器热负荷分别变化±2.5％,±5％;进料流率变化土5％;轻关键组份苯在进料中的浓度从0.5变为0.45;同时重关键组份甲苯的浓度从0.4变为0.45。采用加权残差法处理微分方程组,然后解出当精馏塔最终趋于稳态时的组成及其他有关参数。计算结果表明,当计算机所耗时间节省60％时,在绝大多数情况下,全塔液相组成均方根误差小于4×10^-3,结果是令人满意的。更多还原

【Abstract】 Two dynamic models, one of which was used to simulate the transient behavior in binary distillation columns and another for rectifying and stripping section separately, are applied to a ternary mixture, benzene-toluene-ethylben-zene, in a large column with 48 trays. Changing the relux ratio by ±5% and ±10%,reboiler duty by ±2.5% and ±5%, the feed flowrate by ±5% and the concentration of benzene, light key component, in the feed stream from 0.5 to 0.45, while the concentration of toluene, heavy key component, changes from 0.4 to 0.45, and using the method of weighted residuals to treat the set of differential equations, the compositions and other variables in the column are solved when the column reaches steady-state operation. The computational results are satisfactory since the RMS errors of liquii compositions in the column are less than 4×10-3 for most conditions and the computer time is reduced by 60%.更多还原