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System and method for judging critical suspension rotating speed of stirring paddle in solid-liquid two-phase stirring kettle

A technology for judging systems and stirring paddles, applied in chemical instruments and methods, mixer accessories, devices using electric/magnetic methods, etc., can solve problems such as large deviations, inability to directly observe, and affect the judgment of suspension states, etc., to achieve good results adaptive effect

Pending Publication Date: 2022-03-25
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requires the reaction tank to be a transparent container, and the result has a natural defect of strong subjectivity
In addition, for the suspension system with high particle concentration, it often presents an opaque state, which affects the judgment of the suspension state
In industrial production, most of the stirred tanks are opaque and cannot be directly observed. The judgment of the critical suspension speed using empirical formulas is generally restricted by various factors such as paddle type, size, height from the bottom, and particle diameter distribution. The actual situation is quite different

Method used

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  • System and method for judging critical suspension rotating speed of stirring paddle in solid-liquid two-phase stirring kettle
  • System and method for judging critical suspension rotating speed of stirring paddle in solid-liquid two-phase stirring kettle
  • System and method for judging critical suspension rotating speed of stirring paddle in solid-liquid two-phase stirring kettle

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A system for judging the critical suspension speed of a stirring paddle in a solid-liquid two-phase stirred tank, such as figure 1 As shown, the stirring tank 1 is included, the stirring tank 1 is provided with a stirring paddle 11, the stirring paddle 11 is connected with the motor 12, the motor 12 is connected with the speed controller 2, and the side wall of the stirring tank 1 and the stirring paddle 11 is horizontally flush. A group of electrodes 3, a second group of electrodes 7 is arranged in the middle of the bottom of the stirred tank 1, the first group of electrodes 3 is composed of two first excitation electrodes 31 and two first measurement electrodes 32, the second group of electrodes 7 are composed of two second excitation electrodes 71 and two second measurement electrodes 72, the first excitation electrodes 31 and the second excitation electrodes 71 are connected to the constant current source 4, the first measurement electrodes 32 and the second measurem...

Embodiment 2

[0026] A method for judging the critical suspension speed of the stirring paddle adopts the critical suspension speed determination system of the paddle in the solid-liquid two-phase stirred tank of embodiment 1, comprising the following steps:

[0027] ① if figure 1 As shown, the first group of electrodes 3 is installed on the side wall of the stirring tank 1 and the stirring paddle 11 is horizontally flush, and the second group of electrodes 7 is installed in the middle of the bottom of the stirring tank 1. The stirring paddle 11 is adjusted by the motor and the speed controller rotating speed; the first group of electrodes 3 is composed of two first excitation electrodes 31 and two first measurement electrodes 32, and the second group of electrodes 7 is composed of two second excitation electrodes 71 and two second measurement electrodes 72 composition; the height of the stirred tank used is 0.6m, the diameter is 0.4m, the liquid level is 0.4m, the liquid medium is tap wate...

Embodiment 3

[0033] A method for judging the critical suspension speed of the stirring paddle adopts the critical suspension speed determination system of the paddle in the solid-liquid two-phase stirred tank of embodiment 1, comprising the following steps:

[0034] ① if figure 1 As shown, the first group of electrodes 3 is installed on the side wall of the stirring tank 1 and the stirring paddle 11 is horizontally flush, and the second group of electrodes 7 is installed in the middle of the bottom of the stirring tank 1. The stirring paddle 11 is adjusted by the motor and the speed controller rotating speed; the first group of electrodes 3 is composed of two first excitation electrodes 31 and two first measurement electrodes 32, and the second group of electrodes 7 is composed of two second excitation electrodes 71 and two second measurement electrodes 72 composition;

[0035] The height of the stirred tank is 0.6m, the diameter of the stirred tank is 0.4m, the height of the liquid level...

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Abstract

The invention discloses a system and a method for judging the critical suspension rotating speed of a stirring paddle in a solid-liquid two-phase stirring kettle, and belongs to the technical field of critical rotating speed judgment. By establishing the relation between the voltage of the measuring electrode and the solid-liquid suspension state, the problems of high subjectivity and large deviation caused by the fact that the critical suspension rotating speed is observed and judged by depending on an empirical formula and human eyes at present are solved, and the system and the method for judging the critical suspension rotating speed of the stirring paddle in the solid-liquid two-phase stirring kettle have good adaptability and are suitable for popularization and application. The method is a quantitative critical suspension rotating speed judgment method, the electrode voltage ratio serving as a judgment standard is only related to the spatial density of solid particles in a liquid phase, and the method can be adopted for wide viscosity and solid content ranges of the solid phase and the liquid phase.

Description

technical field [0001] The invention relates to the technical field of critical rotational speed determination, in particular to a critical suspension rotational speed determination system and determination method for stirring paddles in a solid-liquid two-phase stirred tank. Background technique [0002] Critical suspension means that all solid particles in the reaction kettle just reach complete suspension from the bottom during the reaction, and the corresponding agitator speed is the critical suspension speed. The determination of the critical suspension speed is of great significance to the solid-liquid two-phase agitation. When the critical suspension speed is not reached, solid particles will be deposited, and there are many dead zones in the stirring tank, which will affect the mass transfer effect. When the stirring speed exceeds the critical suspension speed, if the speed continues to increase, the power consumption will increase greatly. The durability of the pad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/44B01F35/221B01F35/213B01F27/90
CPCG01P3/44
Inventor 王达彤徐婷王灏卢福军郭鹏周长海杨旭岳涛
Owner QINGDAO UNIV OF SCI & TECH