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Micro-interface enhanced reactor bubble scale structure-activity regulation and control model building method

A model modeling and reactor technology, which is applied in the direction of instruments, special data processing applications, electrical digital data processing, etc., can solve the problems of reactor design without guiding significance, large errors, energy consumption of microbubble equipment and high manufacturing costs

Active Publication Date: 2018-01-09
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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
[0013] 1. where n i represents the number of bubbles, d i Represents the diameter of the bubbles; the disadvantage of this algorithm is that it is necessary to know the diameters and numbers of all the bubbles in the system, which cannot be done at present, and this formula does not include the structural parameters, operating parameters and physical parameters of the reactor. The design of the device has no guiding significance, and it is not a structure-activity regulation model in the true sense;
[0014] 2.d 32 =αd max , the proportional coefficient α in this formula is estimated by experience, and it can only be used for some specific systems, and the error is large
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 enhanced reactor bubble scale structure-activity regulation and control model building method
  • Micro-interface enhanced reactor bubble scale structure-activity regulation and control model building method
  • Micro-interface enhanced reactor bubble scale structure-activity regulation and control model building method

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Embodiment 1

[0165] This embodiment specifically illustrates the modeling method of the bubble scale model of the present invention.

[0166] The method of the present invention comprises:

[0167] (1) The maximum bubble diameter d of the micro-interface strengthened reactor max and the minimum bubble diameter d min is the independent variable, the average Sauter diameter of bubbles d 32 As the dependent variable, establish d max 、d min and d 32 The relationship between them; the specific steps are as follows:

[0168] Let x, m, and n be the mean and standard deviation of the bubble particle size and the geometric natural logarithm of the bubble particle size in the gas-liquid system of the reactor, respectively, and obtain the probability density function of the bubble particle size x:

[0169]

[0170] Bubble Sauter average diameter d when the bubble particle size satisfies this distribution 32 for:

[0171] d 32 =exp(m+2.5n 2 ) (2)

[0172] The bubble size x is log-normall...

Embodiment 2

[0278] 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 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.

[0279] The bubble-scale structure-effect control model constructed according to Example 1 is as follows:

[0280]

[0281] d min =11.4(μ L / ρ L ) 0.75 ε -0.25 (twenty one)

[0282] d max =0.75(σ L / ρ L ) 0.6 ε -0.4 (twenty four)

[0283]

[0284]

[0285]

[0286]

[0287] In the formula, Q L is the liquid circulation volume flow rate in the reactor; L mix is the length of the bubble crushing zone; D 1 is the diameter of the bubble breaking tube; λ ...

Embodiment 3

[0288] The model selected in embodiment 3 mainly considers L mix less than L b The situation, because the opposite situation is not common, more extreme. The structural parameters of the reactor also need to satisfy: λ 1 =0.1~0.5、K 1 =0.5,L b =13D 1 ;

[0289] For carbon dioxide and water system, when the operating conditions are: Q L =2000L / h(5.56×10 -4 m 3 / s), gas flow Q G =0.2Q L , T=298K, P G0 =1atm; and the physical parameters of the liquid phase in this system are: ρ L =1000kg / m 3 , μ L =8.9×10 -4 Pa s, σ L =7.197×10 -4 N / m; diameter of reactor bubble breaker tube D 1 =0.02m; E 0 Indicates the energy input by the system, that is, the rated power on the nameplate of the circulating pump, take E 0 = 1000W.

[0290] According to the operating conditions and the above model, the average diameter of bubble Sauter can be calculated d 32 =0.426mm, while the average diameter of bubbles obtained under traditional process conditions is about 1mm. It can be s...

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Abstract

The invention relates to a micro-interface enhanced reactor bubble scale structure-activity regulation and control model building method. The diameter dmax of the largest bubble of a micro-interface enhanced reactor and the diameter dmin of the smallest bubble of the micro-interface enhanced reactor serve as independent variables, the average diameter d32 of the bubble Sauter serve as a dependentvariable, and a numerical relationship is built; based on the Kolmogorov-Hinze theory, the relationship between the diameter dmax of the largest bubble of the micro-interface enhanced reactor, the diameter dmin of the smallest bubble and the parameters of the reactor is built. According to the method, the reactor bubble scale is associated with the structural parameter, the operation parameter andthe physical property parameter of the reactor by using specific numerical relationship, the numerical relationship has the guiding significance for the design of the reactor and can be applied to avariety of reactors, the versatility is good, by means of a bubble scale regulation and control model built through the method, by adjusting the structural parameter and the operation parameter of thereactor, and the maximization of energy efficiency and material efficiency in the reaction process can be achieved, or under the condition that reaction targets, energy consumption and material consumption are given, 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 bubble-scale structure-effect control model of a micro-interface strengthening reactor. 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 Sauter ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
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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