A Steady State Solute Concentration Distribution Model for Continuous Countercurrent Two-Phase Mass Transfer Process

Abstract

The invention discloses a steady-state solid-liquid two-phase solute concentration distribution model in a continuous reverse flow mass transfer process. The volume flow of a solid phase in a model independent variable is changed; Volume flow rate of liquid phase, the retention time of the solid phase in the continuous reverse flow mass transfer space is reserved, the coefficient of an equation set and the intermediate parameter of a matrix equation are obtained again, and a solute concentration distribution matrix meeting the expected requirement, the volume flow of the solid phase corresponding to the distribution matrix, the volume flow of the liquid phase and the retention time of the solid phase in the continuous reverse flow mass transfer space are obtained; The model utilizes a CFDmodel to obtain a flow field matrix. performing finite element redivision on the continuous countercurrent reaction process on the basis; meanwhile, solid-liquid two-phase diffusion mass transfer andconvection mass transfer are considered, a solid-phase, liquid-phase and boundary solute conservation equation set is established, compared with a mass transfer process directly defined in a CFD original program, calculation resources are greatly saved, the calculation efficiency of concentration field distribution is improved, and the method is more convenient to write into hardware to carry outlow-cost operation.

Description

technical field [0001] The invention relates to the solid-liquid two-phase mass transfer in the field of chemical industry, in particular to a model for calculating the solute concentration distribution in the continuous countercurrent extraction process. Background technique [0002] For industrial solid-liquid two-phase mass transfer processes such as adsorption, desorption, leaching, decolorization, etc., especially for natural product extraction processes in food processing, most of the main equipment has been converted from batch reactors to continuous countercurrent reactors. Compared with the former, the latter has the advantages of high mass transfer efficiency, high two-phase utilization rate, and continuous production. However, since the concentration inside the continuous countercurrent reactor changes with time and position, it is difficult to directly achieve the purpose of changing the quality of the unit product by adjusting the operating parameters, so the co...

AI Technical Summary

Problems solved by technology

However, just because the CFD model is based on the finite element calculation model of fluid dynamics, it has a large amount of calculation, complex calculation, consumes more calculation resources, and is coupled to other physical fields such as mass transfer at the same degree of finite element division. After the field, heat transfer field, etc., the calculation difficulty will be more difficult, and it is difficult to realize in industrial practical applications. Therefore, it is urgent to develop a model with a small amount of calculation, low calculation cost, and accurate calculation of the concentration distribution of the reactor. , quantitatively guide the setting of working conditions and equipment manufacturing

Images