THERMAL SCIENCE

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Maria Doichinova

,

Christo Boyadjiev

A NEW APPROACH FOR THE COLUMN APPARATUSES MODELING IN CHEMICAL AND POWER ENGINEERING

ABSTRACT
The column apparatuses are main devices for solution of technological and ecological problems in chemical and power engineering. A new approach of the column apparatuses modeling on the base of the physical approximations of the mechanics of continua, using two steps models: convection-diffusion type of model (for qualitative analysis) and average concentration model (for quantitative analysis), is presented. The convection-diffusion type of models describe chemical and mass transfer processes in column apparatuses in the cases of one, two ore three phases systems, where the solid phase is reagent, catalytic or packed bad. A qualitative analysis of these models, using generalized (dimensionless) variables, where the characteristic (inherent) scales are the maximal or average values of the variables, is presented. The using of the convection-diffusion type of models for quantitative analysis of the processes in column apparatuses is not possible because the velocity function in the convection-diffusion equation is unknown. The problem can be avoided if the average values of the velocity and concentration over the cross-sectional area of the column are used. The average concentration models permit to analyze the effect of the radial nonuniformities of the velocity and the concentration on the process efficiency in the column and to solve the scale-up problem. The convection-diffusion type of models are presented as a base for to be created convection and diffusion type of models.
KEYWORDS
column apparatuses modeling, velocity radial non-uniformity, convection–diffusion type of model, convection type of model, diffusion type of model, average concentration model
PAPER SUBMITTED: 2013-04-09
PAPER REVISED: 2014-10-20
PAPER ACCEPTED: 2014-11-03
PUBLISHED ONLINE: 2014-11-08
DOI REFERENCE: https://doi.org/10.2298/TSCI130409121D
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE Issue 5, PAGES [1747 - 1759]
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A new approach for the column apparatuses modeling in chemical and power engineering

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence