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Long-paddle short-blade composite stirrer

A short blade and agitator technology, applied in mixers, mixers, mixing methods and other directions with a rotary stirring device, can solve the problems of uneven gas distribution and insufficient gas absorption, and achieve simple structure and improved gas-liquid transmission. Quality efficiency, the effect of a wide range of applications

Active Publication Date: 2014-05-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Purpose of the invention: The purpose of the present invention is to provide a long paddle and short blade composite stirrer with surface air suction function for gas-liquid stirring, so as to solve the problems of insufficient gas absorption and uneven gas distribution of traditional stirrers, and realize Rapid mixing between fluids, especially for the reaction process of rising liquid level can achieve satisfactory stirring effect, the present invention is also applicable to the stirring of gas external circulation reactor

Method used

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  • Long-paddle short-blade composite stirrer
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  • Long-paddle short-blade composite stirrer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Compound agitator with long paddles and short blades, see figure 2 , including fixed plate 1, long paddle 2, connecting plate 3 and short blade 4, the top of long paddle 2 is fixed on the bottom of fixed plate 1 through nuts, the bottom end is fixed on the top of connecting plate 3, and short blade 4 is fixed on the bottom of connecting plate 3 bottom. The connection plate 3 is a group of concentric rings, and the group of rings and the short blades 4 are fixed to each other by welding or other methods.

[0043] In this embodiment, the number of long paddles 2 is three, and the long paddles 2 are cuboids whose horizontal section is a rectangle of 16×8mm. On the outermost ring of connection plate 3, see image 3 ; The height of the long paddle is 850mm; the short blade 4 is a flat plate, its length and height are 80mm and 60mm respectively, and the thickness is 3mm, there are 6 pieces in total, see Figure 4 .

[0044] The working principle of the composite agitator w...

Embodiment 2

[0049] Adopt the compound agitator with long paddle and short blade of the same structure and size as Example 1, only adjust the angle β between the long side of the rectangle and the radial direction by 45°, as Figure 5 As shown, the rest of the operating conditions remained unchanged.

[0050] When the stirring speed is N=200rpm, the above-mentioned long and short paddle composite stirrer is used:

[0051] When H / D T =1, the power consumption per unit volume P / V=3.3kW / m 3 , volumetric mass transfer coefficient k L a=0.132s -1 ;

[0052] When H / D T =2, power consumption per unit volume P / V=4.8kW / m 3 , volumetric mass transfer coefficient k L a=0.120s -1 .

[0053] The above results show that whether it is clockwise or counterclockwise, the power consumption per unit volume P / V is slightly smaller than that of the mass transfer coefficient k under the same conditions. L The a value is also slightly smaller than the measured value of the long paddle and short blade c...

Embodiment 3

[0055] Adopt the long paddle short blade composite agitator of the same structure and size as embodiment 1, only the long paddle 3 is evenly distributed on the inner ring of the connection plate, as Figure 6 Shown, all the other operating conditions also keep consistent with embodiment 1.

[0056] When the stirring speed is N=200rpm, the above-mentioned long and short paddle composite stirrer is used:

[0057] When H / D T =1, the power consumption per unit volume is 3.8kW / m 3 , volumetric mass transfer coefficient 0.121s -1 ;

[0058] When H / D T =2, the power consumption per unit volume is 5.6kW / m 3 , volumetric mass transfer coefficient 0.086s -1 .

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Abstract

The invention discloses a long-paddle short-blade composite stirrer. The long-paddle short-blade composite stirrer comprises a fixed plate (1), a group of long paddles (2), a connection plate (3) and a group of short blades (4), wherein upper ends of the long paddles (2) are fixed on the fixed plate (1); lower ends of the long paddles are fixed on the top of the connection plate (3); the short blades (4) are fixed at the bottom of the connection plate (3). The stirrer is simple in structure, has surface self-inspiration function and is capable of greatly improving gas-liquid mass transfer efficiency, has good operation flexibility, is applicable to mixing process of liquid with different viscosities or gas-liquid and gas-liquid-solid multiphase dispersion process and also applicable to single-phase mixing process or multiphase dispersion process with continuous change of liquid level.

Description

technical field [0001] The present invention relates to a novel composite agitator with long paddles and short blades. Specifically, the agitator involved in the present invention can realize mixing of homogeneous systems (such as liquid-liquid mixing), heterogeneous systems, and The dispersion process (such as the dispersion of gas in liquid, the dispersion of two immiscible liquids, or the efficient mixing and dispersion of gas-liquid-solid three-phase system), belongs to the field of industrial fluid mixing, multiphase dispersion, and reaction equipment. Background technique [0002] Gas-liquid dispersion and reaction problems are often encountered in chemical and pharmaceutical industries, such as liquid-phase catalytic hydrogenation of nitroaromatics, fatty nitriles, alkenes and alkynes, alkylation reactions, carbonylation reactions, oxidation reactions etc.; their common feature is that the reaction rate is controlled by gas / liquid mass transfer, and gas / liquid mass tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F7/20B01F3/04B01J10/00B01F27/906B01F27/93
CPCB01F27/0721B01F27/0725B01F27/0727B01F27/13B01F27/192
Inventor 骆培成吴华吴俊邰芸翠罗小雨
Owner SOUTHEAST UNIV
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