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Multifunctional improved disc-turbine stirring device

A disc turbine stirring and multi-functional technology, applied in the direction of mixer with rotating stirring device, transportation and packaging, dissolution, etc., can solve the problem of increasing energy consumption and so on

Inactive Publication Date: 2013-03-27
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

A single radial flow paddle or axial flow paddle is difficult to meet the dispersive mixing requirements of this type of process. In experimental research and industrial practice, a combination of double or even more layers of paddles is often used to complete the dispersive mixing requirements of these processes. This undoubtedly increases the energy consumption
[0003] In the research and development of new impellers, most domestic patents and researches focus on the improvement of the shape of the blades and the invention of the accessories of the agitating device, all of which are for the strengthening of the single function of the impeller (radial or axial flow), such as a glass-lined Hydrofoil type axial flow stirring paddle (Chinese patent, application number 03231827.8), a kind of stirring paddle (Chinese patent, application number 200620064206.1) and combined surface aeration stirring paddle (Chinese patent, application number 00102745.X), do not have at present Relevant patents and reports of stirring paddles that can better complete multiple functions (bubble or droplet crushing and transport, gas dispersion and solid suspension) at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] For the single-phase system, the single-phase macro-mixing characteristics of the improved disc turbine stirring device were measured in a cylindrical flat-bottomed stirring tank with baffles using deionized pure water as the medium. The experimental device is attached Figure 4 As shown, the size of the experimental device is that the inner diameter of the stirring tank is T=380mm, and there are 4 baffles evenly distributed in the stirring tank, and the width of the baffles is b=T / 10. When the liquid level in the stirring tank is at rest, the height is H=T, and the diameter of the stirring paddle is D=T / 3. The height of the stirring paddle from the bottom of the stirring tank is C=T / 3. The stirring speed is N=100-500 rpm. The mixing time of the improved disk turbine, standard RDT disk turbine and pitched blade disk turbine at different speeds were measured by conductometric method.

[0020] Install the conductivity electrode in the side hole at the bottom of the sti...

Embodiment 2

[0023] In the stirring tank shown in Example 1, tap water is used as the liquid phase, and air is introduced through a gas distributor at a ventilation rate of 5-50 L / min and a stirring speed of 100-500 rpm. steady state dropwise addition of Na 2 SO 3 Methods The gas-liquid volume mass transfer coefficients of three agitators including improved disk turbine, standard RDT disk turbine and pitched-blade disk turbine were determined. Steady drop Na 2 SO 3 method, by pre-adding a certain amount of CoSO 4 In the gas-liquid stirring tank with stable operation of the catalyst, a certain concentration of Na is continuously fed at a fixed flow rate (peristaltic pump control). 2 SO 3 solution, Na 2 SO 3 Reacts with dissolved oxygen in the water phase, when Na 2 SO 3 The oxidation rate and Na 2 SO 3 When the feeding amount reaches dynamic equilibrium, the dissolved oxygen concentration in the water phase will reach a certain value. According to the corresponding formula, the g...

Embodiment 3

[0026] In the stirring tank shown in Example 1, tap water is used for the liquid phase, and the installation position of the stirring paddle is moved to the position of h=30mm below the liquid surface, the diameter of the paddle D=T / 2, and the steady state described in Embodiment 2 is adopted. drop Na 2 SO 3 Methods The gas-liquid volume mass transfer coefficients of three agitators including improved disk turbine, standard RDT disk turbine and pitched-blade disk turbine were determined. The stirring speed is 100-500 rpm.

[0027] Experimental results such as Figure 7 As shown, the gas-liquid volume mass transfer coefficients of the three agitators are ranked as follows: improved disc impeller > standard RDT disc impeller > inclined blade disc impeller. The research on the surface aeration mechanism points out that the surface aeration process is divided into two steps: the gas is sucked from the liquid surface through the vigorous stirring of the surface aeration paddle; ...

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Abstract

The invention relates to a multifunctional improved disc-turbine stirring device comprising a stirring tank, a stirring shaft, and an improved disc-turbine stirring paddle arranged on the shaft. A ratio of a paddle diameter D and a tank diameter T can be calculated according to that D=T / 4-T / 2. 4-12 vertical baffles are uniformly arranged on a tank wall peripheral direction, wherein the width b of the baffle equals T / 12-T / 10. Compared with a standard or a pitched-blade disc-turbine, the device provided by the invention is characterized in that 4-12 rectangular paddle blades are arranged on a disc and are vertically and obliquely uniformly staggered on the disc surface. An included angle of the obliquely blades and the disc is 15-75 DEG. The paddle blade height is T / 15-T / 10, and a paddle blade width is T / 8-T / 4. The multifunctional improved disc-turbine stirring paddle provided by the invention has both advantages of the standard and pitched-blade disc-turbine paddles, and overcome the defects of the two. Relatively high macro-mixing capacity is provided, and relatively high shearing force is provided. The device can be better applied in a multi-phase stirring process requiring both mixing and fluid shearing.

Description

technical field [0001] The invention belongs to a multiphase mixing and stirring device in the fields of chemical industry, hydrometallurgy, environmental protection, biochemical pharmacy, petrochemical industry and the like. This kind of mixer is suitable for multi-phase mixing process, especially the process that requires both mixing ability and fluid shear, such as surface aeration process and gas-liquid-solid three-phase mixing process. Background technique [0002] The impellers used in industry are divided into two types according to the flow pattern they form: one is the radial flow impeller (such as Rushton impeller, referred to as RDT impeller), which can generate relatively large shear force and can Good breaking of bubbles and droplets, suitable for gas-liquid and liquid-liquid two-phase mixing process; the other type is axial flow impeller (such as pusher propeller), which has stronger axial circulation capacity and lower The power criterion has been widely used...

Claims

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Application Information

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IPC IPC(8): B01F7/26B01F27/93
CPCB01F27/1111
Inventor 李向阳杨超毛在砂邓刚程景才张广积
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI