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Double-layer stirring paddle combination device

A technology of combining device and stirring paddle, which is applied to mixers, mixers, transportation and packaging with rotary stirring devices, etc. Not applicable to problems such as active organisms, to achieve the effects of shortening mixing time, improving liquid-solid suspension, and improving circulation capacity

Inactive Publication Date: 2012-02-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] "Combined impeller" (Chinese patent, authorized announcement number CN 201500517U) is mainly used in multi-phase systems with high solid content, viscous system and low gas holdup. Too much force is not suitable for reaction systems with active organisms (such as biometallurgy); "combined surface aeration stirring paddle" (Chinese patent, patent number ZL 00102745.X) is only suitable for gas-liquid systems, not for Mixing operation with solid phase suspension

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] For the liquid-solid two-phase system, tap water is used as the liquid phase and quartz sand is used as the solid phase (density 2650kg / m 3 , particle size range 75-150μm). The liquid level in the tank is 532mm high, the diameter of the stirring paddles is 127mm, the height of the lower paddle from the bottom is 127mm, and the distance from the upper paddle to the liquid surface is 60mm.

[0017] The critical off-bottom suspension is a very important dispersion state in the liquid-solid mixing operation. At this time, the effective contact area between the solid phase and the liquid phase reaches the maximum value, and the corresponding speed is called the critical off-bottom suspension speed (N js ), N js It can be used to measure the ability of the stirring paddle to suspend solids. The following table provides the critical off-bottom suspension rotational speed N of the combination stirring paddle of the present invention and the combination of traditional double R...

Embodiment 2

[0021] For the gas-liquid two-phase system, in the stirred tank device with the structure as described in Example 1, tap water is used as the liquid phase, air is used as the gas phase, and the annular gas distributor is passed in from the bottom of the stirring paddle, and the ventilation rate is 0.2m 3 / h.

[0022] The following table shows the different rotational speeds (s -1 ) power consumption per unit volume (kW / m 3 ). It can be seen that the stirring paddle combination device of the present invention has obvious improvement in power consumption under the gas-liquid two-phase condition, and the power consumption per unit volume under the same rotating speed condition is about 60.0% to 77.93% of the traditional double-layer Rushton paddle combination .

[0023] Table 2. Comparison of power consumption per unit volume for different impeller combinations

[0024]

Embodiment 3

[0026] The mixing time is an important parameter to characterize the mixing performance of the stirred tank reactor. In this embodiment, in a stirred tank with a structure such as that of Example 1, the conductometric method was used to measure the temperature of the single liquid phase system at different stirring speeds (s -1 ) macroscopic mixing time (s) under the condition. Concrete implementation is as follows: with saturated NaCl solution (250g / L) as tracer, add in the liquid level place of stirring tank, conductance electrode is placed on the other side near the bottom of the tank, for measuring the change of local conductivity with time, The output signal of the conductivity electrode is amplified and converted by the computer for data acquisition and processing. Since the output signal of the conductivity meter always fluctuates to a certain extent, it is generally considered that the difference between the output signal of the conductivity meter and the average valu...

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Abstract

The invention relates to a double-layer stirring paddle combination device comprising a stirring shaft, wherein an offset paddle and a centripetal paddle are sequentially installed at the stirring shaft from top to bottom. Compared with a traditional combined stirring paddle, the double-layer stirring paddle combination device is characterized in that the upper part of the stirring shaft is provided with the offset paddle, paddle blades are vertically and evenly distributed above and below a disk in a staggered way, and vanes are installed on the disk along a radial direction; and the lower part of the stirring shaft is provided with the centripetal paddle, and paddle blades are pitched at 20 to 70 degrees towards a rotating direction in comparison with the radial direction of the disk. The combined paddle is beneficial to lowering the stirring energy consumption, reducing the mixing time and increasing the axial circulation capability, thereby improving liquid-solid suspension.

Description

technical field [0001] The invention belongs to the mixing and stirring device in the fields of petrochemical industry, hydrometallurgy, environmental protection and biochemical pharmacy, and is especially suitable for the dispersion, mixing and chemical reaction process of gas-liquid, liquid-solid, gas-liquid-solid and other multiphase systems. Background technique [0002] Industrial mixing operation selects the corresponding mixing device according to the needs of different systems. Generally speaking, for the mixing process of gas-liquid system, it is necessary to choose a radial flow paddle with strong shear capacity (such as Rushton stirring paddle), which has a strong gas dispersion ability, which is beneficial to the circulation of liquid and the breakup of bubbles. For the mixing of liquid-solid systems, it is necessary to choose axial-flow propellers with strong axial circulation capabilities (such as inclined blade propellers, propellers), which are conducive to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F7/26B01J19/18B01F27/93
Inventor 杨超冯鑫王涛毛在砂李向阳程景才范平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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