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Optimisation of an industrial scale ethanol dehydration plant: A case study

机译:优化产业规模乙醇脱水厂:案例研究

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An industrial scale hybrid ethanol dehydration system is modelled and optimised using MINLP. The system consists of a distillation column for approaching the ethanol/water azeotrope and a pervaporation unit producing pure ethanol. The optimal design and operating parameters including number of trays, feed location, reflux ratio, number of membrane sections in series and the number of membrane modules in each section are determined. Compared to an existing plant, 12 % savings in the total annual cost can be achived by applying 32 % more membrane surface, in consequence of a radical decrease in the reflux ratio (3.3 to 1.4) in the column, and by producing less concentrated alcohol in the distillate. Sensitivity of the total annual cost to the specified ethanol yield, overall membrane surface and membrane replacement cost is studied. Although our superstructure enables partial permeate recycling, total recycling of the permeate flow proved to be optimal in all the realistic cases.
机译:使用MINLP建模和优化工业规模杂交乙醇脱水系统。该系统由蒸馏塔组成,用于接近乙醇/水共沸物和产生纯乙醇的渗透蒸发单元。确定包括托盘数,进给位置,回流比,串联膜部分数和每个部分中的膜模块数量的最佳设计和操作参数。与现有植物相比,通过施加32%的膜表面可以通过施加32%的膜表面来实现12%的成本,从而柱子中的回流比(3.3至1.4)的根本性降低,并通过产生更少的浓缩醇在馏出物中。研究了指定乙醇产量的总年度成本,总膜表面和膜更换成本的敏感性。虽然我们的上部结构能够实现部分渗透再循环,但在所有现实情况下,渗透物流的总回收都证明是最佳的。

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