Abstract

Improving the efficiency of mass-exchange between liquid and steam in rectification columns of cyclic action

Highlights

  • The purpose of the work was to determine the optimal time of residence of the liquid on the plates, the grade of extraction and concentration ratio of volatile impurities of alcohol and the specific consumption of heating steam in rectification columns of cyclic action

  • The maximum extraction of volatile impurities was being achieved in a rectification column, equipped with flaky plates containing turnaround sections connected to drive mechanisms, the action of which is occurred according to a given algorithm

  • The innovative technology of cyclic rectification allows to increase the grade of extraction and the concentration ratio of volatile impurities of alcohol by 25–38% and reduce energy consumption by 40% compared with the known ones

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Summary

Introduction

The purpose of the work was to determine the optimal time of residence of the liquid on the plates, the grade of extraction and concentration ratio of volatile impurities of alcohol and the specific consumption of heating steam in rectification columns of cyclic action. Implementation of controlled cycles of liquid retention on the plates allows to prolong the time of its contact with steam, to create conditions in order to achieve a phase state close to equilibrium and to bring the efficiency of each real plate closer to the theoretical one (Buliy et al, 2019). This significantly reduces the specific consumption of heating steam, decreases the volume of alcohol-containing waste and minimizes the cost of equipment (Kiss, 2015). Despite the obtained positive results in reducing energy costs, the known methods and apparatuses of cyclic operation have not found wide practical application due to the lack of mass exchange in the steam period (Lita et al, 2012), the steam pressure dependence of pouring devices’ operation (Toftegard et al, 2016), the fluctuations of the steam pressure in the collector, the inability to stabilize the hydrodynamic mode of plates (Flodman et al, 2012), the mixing of liquid on adjacent plates during its pouring, the low apparatuses’ steam and liquid throughput capacity, and the complexity of constructive solutions (Bastian et al, 2018)

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