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Combined paddle stirring device

A stirring device and combined paddle technology, which is applied in the field of combined paddle stirring devices, can solve the problems of poor axial and radial mixing ability, increase axial displacement, increase mixing rate, and solve problems of poor axial mixing ability Effect

Active Publication Date: 2018-07-31
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a combined paddle stirring device to solve the problem of poor axial and radial mixing ability of the existing combined paddle stirring device

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0038] Be that 240mm, height be in the flat-bottomed cylindrical stirring tank 1 of 400mm in groove diameter, investigate the combined paddle stirring device provided by the present invention (as figure 1 Shown) and double-deck Rushton paddle stirring device in the prior art (as Figure 4 Shown) power consumption per unit volume. Four baffle plates 2 are installed vertically and evenly on the inner wall of the stirring tank 1, and the width of the baffle plates 2 is 24mm. The tap water liquid level height in the tank is 288mm, the bottom height of the lower Rushton paddles 7 is 60mm, and the paddle pitch of the upper and lower Rushton paddles 7 is 140mm.

[0039] see figure 1 , the upper paddle is a slanted paddle 5 with two blades pressed down by 45°, the paddle diameter of the slanted paddle 5 is 94mm, and the blade width is 24mm; 94mm, wherein: the width of the inclined folding paddle 61 and the vertical folding paddle 62 is 12mm, and the angle between the inclined foldi...

Embodiment 2

[0044] For the liquid-solid two-phase system, the structure and size of the stirring tank 1 of the present embodiment are the same as those in Embodiment 1, the liquid phase still selects tap water, and the solid phase is glass beads with a particle diameter of 2.0 ± 0.1 mm (density 2.817g / cm 3 ), the range of solid phase volume fraction is 0.1%~5%, investigate respectively the combined paddle stirring device provided by the present invention, the double-layer pitched paddle stirring device in the prior art (such as image 3 Shown) and the corresponding critical off-bottom suspension stirring speed of solid particles in the double-layer Rushton paddle stirring device in the prior art under different solid holdups. see figure 2, the upper and lower floor paddles are the oblique blade paddle 5 that the two blades press down 45°, and the paddle diameter of the oblique blade paddle 5 is 94mm, and the blade width is 24mm. The critical off-bottom suspension stirring speed is the m...

Embodiment 3

[0048] The structure and size of the stirring tank 1 of the present embodiment are the same as in the second embodiment, and the mixing time of the single-phase liquid phase system of the combined paddle stirring device provided by the present invention and the double-layer pitched blade stirring device in the prior art is measured by the conductivity method . The sodium chloride solution with a concentration of 15% is used as a tracer, and it is added to the vicinity of the liquid surface of the stirring tank 1 in an instant, and at the same time, the data acquisition card is used to convert the conductivity value of the monitoring point measured by the conductivity meter into an electrical signal, and the signal is recorded by the computer Variation curve over time. In the experiment, the monitoring point and the feeding point are located on the same plane, but on both sides of the stirring shaft 4. The mixing time characterizes the mixing efficiency of the reactor scale in...

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Abstract

The invention belongs to the technical field of stirring equipment, and discloses a combined paddle stirring device. The combined paddle stirring device comprises a stirring tank and a stirring shaft,wherein the stirring shaft is vertically disposed inside the stirring tank, the stirring shaft is provided with an inclined blade paddle and at least one folded blade paddle, and the inclined blade paddle is arranged above the folded blade paddles; each folded blade paddle includes an inclined folded blade paddle body and a vertical folded blade paddle which is connected with the corresponding inclined folded blade paddle. The inclined blade paddle is combined with the folded blade paddles, radial and axial driving forces on fluid are generated by using the inclined blade paddle, and interaction between the inclined part and vertical part of each folded blade paddle is combined, so that the axial discharge capacity of the stirring paddles is increased, suspension of particles off the bottom is driven effectively, the mixing rate of materials in the stirring device is improved, the mixing time is shortened, surface aeration and power consumption are reduced, and the problem of poor mixing ability in axial and radial directions of an existing combined paddle stirring device is solved.

Description

technical field [0001] The invention relates to the technical field of stirring equipment, in particular to a combined paddle stirring device. Background technique [0002] With the enlargement of the industrial scale, the aspect ratio of the stirring device is often greater than 1, and the combined paddle can often obtain better mixing effect than the single-layer paddle. For combined paddles, the cooperation between the impellers of each layer directly determines the internal flow pattern, stirring power consumption and mixing rate of the stirring device, so there are higher requirements for the design of the stirring paddles. [0003] The patent of "Combined Surface Aeration Stirring Paddle" (CN00102745.X) combines self-suspended circular baffles and surface aeration paddles, but it is only suitable for the dispersion and mixing process of gas-liquid systems with small liquid level depths, not applicable Suspension of particles in solid-liquid systems. The patent (CN201...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F7/18B01F7/00
CPCB01F27/074B01F27/112B01F27/90
Inventor 段晓霞冯鑫杨超陈杰毛在砂谢明辉
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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