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Numerical simulation method for electrodialysis mass transfer process

A mass transfer process and numerical simulation technology, applied in chemical process analysis/design, etc., can solve problems such as difficult monitoring, and achieve the effect of improving universality, high degree of agreement with reality, and directional optimization

Active Publication Date: 2020-01-03
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a numerical simulation method of electrodialysis mass transfer process, the method is based on the properties of ion exchange membrane and material solution, with membrane and compartment as calculation unit to carry out the numerical analysis of electrodialysis separation process material transfer, to solve It is difficult to monitor various complex phenomena and parameter changes in the experiment during the electrodialysis process, and it has the advantages of simple modeling and fast calculation and solution.

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  • Numerical simulation method for electrodialysis mass transfer process
  • Numerical simulation method for electrodialysis mass transfer process
  • Numerical simulation method for electrodialysis mass transfer process

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Embodiment 1

[0029] A numerical simulation method of an electrodialysis mass transfer process provided by an embodiment of the present invention specifically includes the following steps:

[0030] S1. Select the Nernst-Planck transfer equation It is used to describe the mass transfer flux in the electrodialysis process, and then related to the electric neutrality equation ∑z j c i = 0, Faraday's law Nernst-Einstein relation u i =D i / (RT) Simultaneously establish a mathematical model, where J i is the ion molar flux, D i is the diffusion coefficient, c i is the ion concentration, z i is the charge number, u i Is the ion migration number, Φ is the potential, the vector u is the fluid velocity, I is the current density, and F is the Faraday constant (96485C / mol).

[0031] S2. Select the secondary current distribution and tertiary current distribution physical fields in the electrochemical module in the Comsol software; specifically, define the model body, boundaries, fluid velocit...

Embodiment 2

[0037] The detailed description and concrete steps of Embodiment 2 of the present invention are as follows:

[0038] S1. Select the Nernst-Planck transfer equation It is used to describe the mass transfer flux in the electrodialysis process, and then related to the electric neutrality equation ∑z j ci = 0, Faraday's law Nernst-Einstein relation u i =D i / (KT) Simultaneously establish a mathematical model, where J i is the ion molar flux, D i is the diffusion coefficient, c i is the ion concentration, z i is the charge number, u i Is the ion migration number, Φ is the potential, the vector u is the fluid velocity, I is the current density, and F is the Faraday constant (96485C / mol).

[0039] S2. Select the secondary current distribution and tertiary current distribution physical fields in the electrochemical module in the Comsol software; specifically, define the model body, boundaries, fluid velocity variables in the compartment, and ion diffusion coefficients in the...

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Abstract

The invention discloses a numerical simulation method for an electrodialysis mass transfer process. The method comprises the following steps: taking an ion exchange membrane and a compartment as calculation units to carry out numerical analysis of mass transfer under the action of an electric field; establishing a mass transfer model equation by utilizing secondary current distribution and tertiary current distribution theories according to the characteristics of a membrane; and carrying out numerical solution on the model equation by adopting a finite element method. Since it is difficult tomonitor various complex phenomena and parameter changes in the electrodialysis process by means of an experiment alone, the invention provides the numerical simulation method for the electrodialysis mass transfer process, and the numerical simulation method is beneficial to research of parameter change rules and prediction of electrodialysis behaviors. The simulation method is simple in geometricmodel, short in calculation time and visual in parameter change, and can be applied to analog simulation of processes of seawater / brackish water desalination and material separation and the like.

Description

technical field [0001] The invention belongs to the technical field of numerical simulation of water treatment problems, and relates to a numerical simulation method of an electrodialysis mass transfer process. Background technique [0002] Electrodialysis is a material separation process that uses ion exchange membranes to separate ions from solutions and other uncharged components driven by an electric field. This technology has the advantages of simple pretreatment, strong adaptability, low energy consumption, and low environmental pollution. , Has been widely used in the separation and purification process of chemical, biological and other water treatment fields. The separation effect and current efficiency of electrodialysis mainly depend on the design of electrodialysis equipment and the setting of process parameters. However, because the electrodialysis process includes complex phenomena such as fluid flow behavior, concentration polarization, material transfer, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C20/10
CPCG16C20/10Y02A20/124
Inventor 祝海涛吴雅琴张高旗杨波李淑娜李想
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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