定量比较双反应段和外部环流反应精馏塔的性能

Quantitative comparison of performance of RDC-TRS and RDC-TBER

虽然单反应段外部环流反应精馏塔(RDC-TBER)相较于双反应段反应精馏塔(RDC-TRS)能够提高塔内部的物质耦合和能量耦合,从而达到节能的目的,但这种优越性有可能会随着进料和操作条件的改变而发生变化。文中针对一类具有最不利相对挥发度排序的四元理想可逆放热反应A+BC+D,基于化学平衡常数、相对挥发度和产物纯度这3个参数,以年总成本(TAC)为目标函数,分析比较了不同进料和操作条件下RDC-TBER和RDCTRS的稳态性能。由结果可知,在不同的进料和操作条件下,RDC-TBER较RDC-TRS均具有更小的TAC,证明了RDC-TBER具有更好的适应性。

Although the reactive distillation column with a top-bottom external recycle （RDC-TBER） had stronger internal mass and energy integration than the reactive distillation column with two reactive sections （RDC-TRS） , and attained the goal of energy-saving. This advantage was likely to be changed when the feeding and operating conditions changed. The hypothetical ideal exothermic reversible reaction A ＋ B →←C ＋ D with the most unfavorable ranking of relative volatilities was studied based on the chemical equilibrium constants, relative volatility and product purity. The total annual cost（TAC） as objective function was analyzed, and the steady-state performance between RDC-TBER and RDC-TRS was compared under different feeding and operating conditions. The results show that the RDC-TBER has less TAC than the RDC-TRS under different feeding and operating conditions, which proves that the RDC-TBER has better applicability