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Micro-interface enhancement reactor reaction rate structure-activity regulation and control model modeling method

A technology of reaction rate and model modeling, applied in the direction of adaptive control, instrument, general control system, etc., can solve the problems of high energy consumption and manufacturing cost of microbubble equipment

Active Publication Date: 2018-01-09
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
However, for the micro-interface strengthening reactor, the work in this area is still blank in the world.

Method used

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  • Micro-interface enhancement reactor reaction rate structure-activity regulation and control model modeling method

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Experimental program
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Embodiment 1

[0301] This embodiment specifically illustrates the technical solution of the modeling method of the present invention.

[0302] The method of the present invention specifically includes the following steps:

[0303] Obtain the process conditions of the micro-interface enhanced reactor reaction system, including catalyst, temperature, pressure, and material ratio; calculate the gas-liquid reaction rate;

[0304] Based on Levenspiel's theory, the reaction rate of a multiphase system is expressed by the following formula:

[0305]

[0306] In the above formula, r A Is the reaction rate of reactant A, mol(A) / m -3 (reactor)·s; H A Is the Henry's constant of reactant A, Pa·m 3 / mol; k G , K L , K S They are the mass transfer coefficients of gas side, liquid side and liquid-solid, m / s. a, a S Respectively the area of ​​the gas-liquid boundary, the area of ​​the liquid-solid boundary, m 2 / m 3 ;K A Is based on the reaction rate r A The first order intrinsic reaction rate constant, m 3 (A) / m ...

Embodiment 2

[0546] This embodiment is based on figure 1 The shown reactor is taken as an example to illustrate the application of the model constructed by the modeling method described in Example 1 in a carbon dioxide and water system reactor. figure 1 The structure of the reactor can be the structure of an existing reactor, and only the method of the present invention is used for parameter design, and the structure of the reactor is not repeated in the present invention.

[0547] The structure-activity control model of the reaction rate constructed according to Example 1 is as follows:

[0548]

[0549]

[0550]

[0551]

[0552]

[0553]

[0554] d min = 11.4(μ L / ρ L ) 0.75 ε -0.25 (72)

[0555] d max =0.75(σ L / ρ L ) 0.6 ε -0.4 (75)

[0556]

[0557]

[0558]

[0559]

[0560]

[0561]

[0562]

[0563]

[0564]

[0565]

[0566]

[0567] Where k G Is the gas mass transfer coefficient, mol / (Pa·m 3 ·S); k L Is the gas mass transfer coefficient, m / s; k A Is based on the reaction rate r A ...

Embodiment 3

[0573] This embodiment is based on figure 1 The reactor shown is an example to illustrate the application of the model constructed by the modeling method described in Example 1 in the air-water system reactor, and the reaction rate r in the reaction system of the existing device A Compared with the superiority.

[0574] Table 3 and Table 4 are the comparison of various parameters of the same system with different particle sizes:

[0575] Table 3 Parameters calculated by the model formula under different particle sizes

[0576]

[0577] Table 4 Three resistances (gas film, liquid film, intrinsic) calculated by the model formula under different particle sizes

[0578]

[0579] As shown in Table 3 and Table 4, under the same conditions, compared to the bubble produced by the traditional reactor with a minimum diameter of 1mm, the bubble produced by MIR is only 0.1mm in diameter, which is 1 / 10 of the original. It is about 4 times larger than the former, and the reaction resistance gradu...

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Abstract

The invention discloses a micro-interface enhancement reactor reaction rate structure-activity regulation and control model modeling method. Based on the Levenspiel theory, a reaction rate structure-activity model suitable for a micro-interface enhancement reactor is constructed. According to the invention, the reaction rate structure-activity regulation and control model constructed through the method can intuitively make out the effects of the bubble diameter, gas-liquid mass transfer coefficients, the mass transfer resistance and the like on the reaction rate; the bubble diameter of a reaction system, the reaction efficiency (energy efficiency and material efficiency), the physical and chemical properties of the system, micro-interface characteristics, mass transfer characteristics andthe reactor structure are correlated through a mathematic method; the energy efficiency and material efficiency of a reaction process are maximized by adjusting structural parameters and operating parameters; and alternatively, a reaction target (mission), energy consumption and material consumption are given, the efficient reactor structure is designed.

Description

Technical field [0001] The invention belongs to the technical fields of chemical manufacturing, reactors, and modeling, and specifically relates to a micro-interface strengthening reactor reaction rate structure-effect control model modeling method. Background technique [0002] Multiphase reactions such as oxidation, hydrogenation, and chlorination are widespread in the chemical production process, and the reaction rate is generally restricted by the mass transfer process. The mass transfer rate of the gas-liquid reaction is mainly affected by the mass transfer coefficient of the liquid side (or gas side) and the gas-liquid boundary area a. Studies have shown that a has a greater influence on the volumetric mass transfer coefficient and is easy to control. Therefore, increasing a is regarded as a particularly effective way to improve the reaction efficiency of a gas-liquid reaction system controlled by mass transfer. [0003] Sauter average bubble diameter d 32 It is one of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 张志炳田洪舟周政张锋李磊王丹亮李夏冰
Owner NANJING UNIV
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