Method for judging multiphase mixing uniformity based on statistics and ergodic theory

A multi-phase mixing and homogeneity technology, applied in the field of chemical engineering, can solve the problems of complex devices, high requirements for stirring medium, and few applications, and achieve the effect of reducing economic losses

Inactive Publication Date: 2010-09-08
KUNMING UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

In recent years, with the development of science and technology, laser Doppler velocimeter LDV, computational fluid dynamics CFD simulation technology and electron tomography technology have been widely used, which has promoted the rapid development of fluid mixing technology. There are many methods for mixing effects, mainly including conductivity method, thermocouple method, optical method, decolorization method, etc. Among them, the conductivity method is widely used in the mixing and mixing of low-viscosity fluids, but it has high requirements for the stirring medium. The medium is deionized water; the thermocouple method will cause damage to the flow field; the general optical method is rarely used due to the complexity of the device; therefore highly subjective

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  • Method for judging multiphase mixing uniformity based on statistics and ergodic theory
  • Method for judging multiphase mixing uniformity based on statistics and ergodic theory
  • Method for judging multiphase mixing uniformity based on statistics and ergodic theory

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: A food processing factory uses mechanical stirring to carry out the operation of mixing materials, such as figure 1 The shown device has 8 sensors installed symmetrically on both sides of the mixing equipment, which are used to collect continuous images of the vertical section inside the mixing equipment. By judging the uniform mixing time of different quality materials at different mixing speeds, the different quality materials can be targeted. The material can choose the best stirring speed, that is, to make the mixing tank reach a uniform state in the shortest time, which is conducive to improving the efficiency of food processing.

[0027] The implementation steps are as follows: 1. Add a spherical material with a density different from that of the material as a tracer particle in the stirring device. 2. use figure 1 The electron tomography system shown in the figure collects continuous patterns of the vertical section and records the tomographic pattern...

Embodiment 2

[0028] Embodiment 2: A certain iron and steel plant uses the mode of mechanical agitation to carry out the operation of desulfurization, uses such as figure 1 The device shown has 8 sensors installed symmetrically on both sides of the mixing equipment, which are used to collect continuous images of the vertical section inside the mixing equipment. By judging the uniform mixing time of different quality materials at different mixing speeds, the The material can choose the best stirring speed, that is to make the stirring tank reach a uniform state in the shortest time, which is conducive to improving the desulfurization efficiency. The specific implementation steps are as follows: 1. Add a spherical material with a density different from that of the material as a tracer particle in the stirring device, and the particle does not melt inside the material. 2. use figure 1 The electron tomography system shown in the figure collects continuous patterns of the vertical section and r...

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Abstract

The invention discloses a method for judging multiphase mixing uniformity based on statistics and ergodic theory, specifically comprising the following steps: (1) placing a tracer particle in an agitation tank as a study object in the mixing process; (2) obtaining continuous real-time agitation patterns of a fault by utilizing electrical process tomography; (3) meshing the obtained continuous real-time agitation patterns of the fault in the multiphase mixing process according to the size of the fault plane; (4) computing how many times the tracer particle passes through each of 1-n regions within certain time by applying statistics and computing the probability P that the tracer particle passes through each region according to the total number of times of passing through 1-n regions; and (5) obtaining the state of uniform multiphase mixing after t by virtue of the ergodic theory of mixing. The method is simple and convenient and the invention provides a reliable and practical method for judging mixing uniformity in chemical and metallurgical agitators and theoretically guiding design of the agitation reactor.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a method for judging the mixing uniformity of all multiphase mixing processes in the fields of metallurgy and chemical industry. Background technique [0002] Stirring is one of the most common operations in chemical and metallurgical processes. From the 1960s to the 1980s, fluid mixing technology developed rapidly. The focus of its research is mainly on the use of conventional stirring paddles in heterogeneous systems such as low-viscosity and high-viscosity non-Newtonian homogeneous systems, solid-liquid suspension and gas-liquid dispersion. Experimental research is carried out on macroscopic quantities such as stirring power consumption and mixing time. Although there are a lot of design experience and correlation methods that can be used to analyze and predict mixed systems, it is still not sure to directly scale up the stirred reactor from the laboratory scale ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F7/20B01F27/906
Inventor 朱道飞王华徐建新王仕博孙辉
Owner KUNMING UNIV OF SCI & TECH
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