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Modelling method for phase contact area structure-activity adjusting and controlling model for micro-interface enhanced reactor

A model modeling, reactor technology, applied in chemical instruments and methods, chemical methods for reacting liquids and gaseous media, and reactions of liquids and gases under foam/aerosol/bubble, etc., can solve the problem of microbubble equipment Problems such as high energy consumption and manufacturing cost, and difficulty in universal application

Active Publication Date: 2017-11-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the energy consumption and manufacturing cost of the equipment for generating microbubbles are too high
[0007] (2) There are no micro-bubble system characteristics based on the continuous liquid phase and high turbulence at home and abroad. Systematic micro-interface mass transfer enhancement theory, micro-bubble testing and characterization methods, and micro-interface enhanced reactor structure-effect control theory have not been proposed. and related mathematical models
There are many such models, and their drawbacks are: the obtained correlations are obtained under specific conditions (including specific reactor structures, stirring methods, gas-liquid physical properties, operating conditions, measurement methods, etc.), which are difficult to apply universally
However, for the micro-interface strengthening reactor, the work in this area is still blank in the world.

Method used

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  • Modelling method for phase contact area structure-activity adjusting and controlling model for micro-interface enhanced reactor
  • Modelling method for phase contact area structure-activity adjusting and controlling model for micro-interface enhanced reactor
  • Modelling method for phase contact area structure-activity adjusting and controlling model for micro-interface enhanced reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0322] This example illustrates the modeling method of the phase interface area structure-effect control model of the present invention.

[0323] The phase boundary area a is one of the key characteristic parameters of the gas-liquid reaction system. The mathematical modeling of a should be objectively aimed at the system with a certain discrete distribution of the particle size of the bubbles (droplets). A large number of experiments and theoretical studies have shown that the particle size of the bubbles (a certain liquid droplet) in the heterogeneous reactor is distributed in a discrete logarithmic normal distribution. Therefore, this paper assumes that this distribution generally exists in various heterogeneous reactors, and there are m types of bubble sizes.

[0324] For the convenience of mathematical processing, it is assumed that the particle size of the bubbles in the system is continuously distributed, and thus the continuous function form of a is obtained, and then ...

Embodiment 2

[0552] This embodiment takesfigure 1 The reactor shown is taken as an example to illustrate the application of the model constructed by the modeling method described in Example 1 in the carbon dioxide and water system reactor. figure 1 The structure of the reactor can be the structure of the existing micro-interface strengthening reactor, and only the method of the present invention is used for parameter design, and the structure of the reactor is not described in detail in the present invention.

[0553] The structure-effect control model of phase interface area is constructed as follows:

[0554]

[0555]

[0556]

[0557]

[0558]

[0559]

[0560]

[0561] d min =11.4(μ L / ρ L ) 0.75 ε -0.25 (67)

[0562] d max =0.75(σ L / ρ L ) 0.6 ε -0.4 (70)

[0563]

[0564]

[0565]

[0566] In the formula, d 32 is the average Sauter diameter of bubbles in the reactor, m; d min 、d max are the largest and smallest bubble diameters in the rea...

Embodiment 3

[0580] This embodiment takes figure 1 The reactor shown is taken as an example to illustrate the application of the model constructed by the modeling method described in Example 1 in the air-water system reactor, compared with the bubble phase interface area a produced by the existing device.

[0581] Table 3 and Table 4 are the comparison of each parameter under different particle sizes of the same system:

[0582] Table 3 Parameters calculated by the model formula under different particle sizes

[0583]

[0584] Table 4 Three kinds of resistance (air film, liquid film, intrinsic) calculated by the model formula under different particle sizes

[0585]

[0586] As shown in Table 3 and Table 4, under the same conditions, the diameter of bubbles produced by MIR is only 0.1mm, which is 1 / 10 of the original, compared with the bubbles produced by traditional reactors with a minimum diameter of 1mm. The product increases by about 467 times, the macroscopic reaction rate incr...

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Abstract

The invention relates to a modelling method for a phase contact area structure-activity adjusting and controlling model for a micro-interface enhanced reactor. A general expression of a gas-liquid interface area of a micro-interface enhanced reactor, a general expression of the gas content of the micro-interface enhanced reactor and an expression of the rising speed of air bubbles in a gas-liquid system of the micro-interface enhanced reactor are established in sequence; a structure-activity adjusting and controlling model of the phase contact area of the micro-interface enhanced reactor is acquired; the blank of prior art is filled up. According to the method provided by the invention, the reaction efficiency (energy efficiency and physical efficiency) of an ultrafine gas-liquid particle reaction system, physical and chemical characteristics of the system, micro-interface characteristics, mass transfer characteristics and a reactor structure are associated according to a mathematical method, so that the maximization target of the energy efficiency and the physical efficiency in a reacting process can be achieved by adjusting structural parameters and operation parameters; or under a specified reaction target (task) and energy consumption and physical consumption, a high-efficiency reactor structure is designed.

Description

technical field [0001] The invention belongs to the technical fields of chemical manufacturing, reactors and modeling, and in particular relates to a modeling method for a micro-interface strengthening reactor phase interface area structure-effect control model. Background technique [0002] Heterogeneous reactions such as oxidation, hydrogenation, and chlorination widely exist in chemical production processes, and their macroscopic reaction rates are generally restricted by mass transfer processes. The mass transfer rate of the gas-liquid reaction is mainly affected by the liquid side (or gas side) mass transfer coefficient and the gas-liquid interfacial area a. Previous studies have shown that a has a greater influence on the volumetric mass transfer coefficient and is easy to control. Therefore, increasing a is considered to be a particularly effective way to improve the reaction efficiency of gas-liquid reaction systems controlled by mass transfer. [0003] Bubble Saut...

Claims

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Application Information

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IPC IPC(8): B01J10/00G06F17/50
CPCB01J10/002B01J2219/0025B01J2219/00243G06F30/20
Inventor 张志炳田洪舟周政张锋李磊王丹亮李夏冰王广辉
Owner NANJING UNIV
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