The calculating the characteristics of vapor-liquid feed at the mobile control of rectification processes
Journal Title: Комп’ютерне моделювання: аналіз, управління, оптимізація - Year 2017, Vol 1, Issue 1
Abstract
The paper presents mathematical and algorithmic bases for calculating the static characteristics of the multicomponent rectification process, taking into account the mobile control actions of different intensity. Since mobile control consists in switching or redistributing the feed flow between the contact devices of the column, the intensity of such an impact is determined by the characteristics of the raw material entering on separation. The problem of calculating the phase composition of the feed flow, the proportion and enthalpies of each phase, the total enthalpy of feed based on the measurement information on temperature, consumption, the composition of the feed and the pressure in the feeding line is solved. The solution algorithm contains two iteration cycles. The outer cycle is designed to calculate the fraction of the liquid phase in the feed, the internal one allows to determine the compositions of the vapor and liquid phases using the phase equilibrium model. In calculating the enthalpy of the liquid phase, the activity coefficients of the components are used, which ensures the applicability of the algorithm in the modeling of azeotropic mixtures. The choice of qualitative initial approximations of the unknown quantities is theoretically justified, which makes it possible to abandon the laborious methods of iterative calculations in favor of the fixed-point iteration method. The results of simulation performed using the presented algorithm on examples of rectification columns for separating a binary methanol-water mixture and a ten-component mixture of methyl tert-butyl ether (MTBE) products prove that the use of the feed temperature as the intensity of the mobile effect on the rectification process provides the necessary heat load of the column.
Authors and Affiliations
А. Р. Шейкус, И. Л. Левчук, В. Я. Тришкин
Keywords
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