JP2749002B2 - High viscosity liquid stirring tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirring tank for uniformly mixing and stirring high-viscosity liquids of various chemical substances, and in particular, to prevent high-viscosity substances from adhering to the inner wall of a container, and to stir in a horizontal direction and in a vertical direction. The present invention provides a stirring tank suitable for mixing and stirring a high-viscosity liquid that can sufficiently perform stirring.

[0002]

2. Description of the Related Art Stirring tanks used in the chemical industry include autoclaves, reactors, mixing tanks, kneaders, and the like, and the type of stirring blade attached to the rotating shaft varies depending on the state and combination of the contents. FIG. 5 shows an example of a conventional stirring blade. The paddle blade shown in FIG. 5 (a) is a typical blade having the simplest structure and a combination of two to eight vertical or inclined flat plates. Discharge performance is poor compared to other blades, and it is mainly used for stirring a homogeneous liquid phase system. The anchor blade shown in Fig. 5 (b) generally has a large blade span with respect to the tank diameter, and is suitable for high-viscosity liquid agitation and crystallization operations. This disadvantage may be exposed depending on the purpose of the stirring. Fig. 5 (c) shows a center disk type of turbine blades, in which a plurality of vertical plates are arranged at the end of a central horizontal disk. Suitable for liquid-solid stirring. Also, FIG.
(D) is for a ribbon wing (Fig. 5 (d) is a double ribbon wing). In the case of a high viscosity liquid of 20,000 to 5,000,000 cP (centipoise), the axial flow (vertical flow) is applied to other blades. It is better than that.

[0003]

Considering each blade of the conventional machine described above from the viewpoint of uniformly mixing and stirring a highly viscous and highly adherent liquid or slurry without adhering to the inner wall of the tank, paddles are considered. As described above, the wings have poor discharge performance, and when used for high-viscosity liquids, they are agitated only around the wings, and the liquid on the inner wall of the container does not move. Anchor blades agitate the liquid on the bottom and inner wall of the tank well, but have poor mixing up and down. Especially in the case of high viscosity liquids, the blades and the liquid rotate together and the mixing action is reduced. Of the turbine blades, flat blades have excellent shearing properties, but their discharge performance is not good.
Inclined wings show the opposite trend. Although ribbon wings are suitable for relatively high-viscosity liquids, they have the disadvantage that the structure is complicated, the production cost is high, and the cost is high. Therefore, there has been a demand for an agitation tank capable of performing uniform agitation by performing mixing in the vertical direction as well as in the horizontal direction without causing the high-viscosity liquid to adhere to the inner wall of the container.

[0004]

In order to solve the above-mentioned problems and to uniformly mix and stir a liquid having a high viscosity and a high adherence, the apparatus of the present invention employs a vertical cylindrical container according to the first invention. An agitating tank having a rotating shaft of a stirring blade which is suspended on a center line of a top of the container and which is connected to a variable speed motor and rotates, the anchor blade sweeping a lower inner peripheral surface of the container with the rotating shaft, and the container An inclined paddle blade is fixed along the inner peripheral surface of the intermediate portion, and a vertical plate is provided on the inner wall of the container. In the second invention, the anchor wing and the inclined paddle wing of the first invention are arranged orthogonally in a plan view.

[0005]

In the high-viscosity liquid stirring tank of the present invention, the interaction between the anchor blade and the anti-friction plate causes a planar overall mixing and a function of preventing the contents from adhering to the inner wall of the tank. The mixing function by moving the contents is combined, and as a result of the three-dimensional mixing and stirring of the tank contents being performed, mixing and stirring with less adhesion to the inner wall is realized.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 show an embodiment of the high-viscosity liquid stirring tank of the present invention. FIG. 1 is an overall vertical sectional view, FIG. 2 is a plan view, and FIG. 3 is an overall vertical sectional view seen from a direction orthogonal to FIG. ,
FIG. 4 is an overall vertical sectional view showing another embodiment.

In FIG. 1, a stirring tank 1 for processing a high-viscosity liquid is provided with a variable speed motor 3 at the center of the top of a substantially cylindrical upright container 2.
The rotating shaft 4 driven by the motor is suspended. At the lower end of the rotating shaft 4, an anchor wing 5 composed of an anchor-shaped curved vertical flat plate is fixed along the bottom of the container 2, and a flat plate sloping about 10 to 30 ° from the vertical at a position above the anchor wing 5. Are arranged near the outer periphery, and the stay 6a is a vertical flat plate.
And an inclined paddle blade connected to the rotation shaft is disposed. An L-shaped baffle plate (baffle) made of a vertical flat plate which is arranged so as not to interfere with the inclined paddle blade 6 and to surround the upper and inner sides of the blade of the inclined paddle blade 6 is provided immediately above the inclined paddle blade 6. A plate 8 protrudes from the inner wall of the container, and a vertical flat anti-friction plate 7 is also provided on the upper inner wall of the container. A supply pipe 10 for charging the contents is attached to the top of the container 2. 9 is a manhole. A flash valve 11 for discharging the contents is provided at the center of the bottom of the container.
Reference numerals 12 and 13 denote water-cooling jackets in the case where the mixing and stirring of the contents involves heat generation, so that cooling water can pass through.
In some cases, the contents are heated. In this case, hot water, steam, and a heat medium are introduced into the jacket. The anchor wings 5 and the inclined paddle wings 6 are arranged orthogonally on a plane as shown in FIG. 2, and the anti-friction plate 7 and the anti-friction plate 8 may be orthogonal as shown in FIG. Is also good. In another embodiment shown in FIG. 4, the upper end of the anchor wing 5 is further extended upward to reach the vicinity of the anti-friction plate 8.
A vertical flat connecting plate 5a may be provided to reinforce the extension of the anchor wing 5 and promote stirring of the central portion of the vessel. The rotation of the rotating shaft 4 may be a low speed in the case of a high-viscosity liquid, and usually uses a variable speed motor of 7.5 to 30 rpm, depending on the diameter of the tank. As the material of the container, for example, it is desirable to use a corrosion-resistant stainless steel plate (SUS316L).
It is not limited to this. The slit between the outer circumference of the anchor wing and the inner wall of the vessel has a tank diameter of about 2000 mm and is 100
If it is within about mm, desirably about 30 mm, even a highly viscous liquid of several thousand cP or more can sufficiently remove the adhesion layer.

Next, a description will be given of the stirring operation when the high-viscosity liquid stirring tank 1 of the present invention configured as described above is processed by storing a high-viscosity liquid or other substances in addition to the high-viscosity liquid. The high-viscosity liquid stored in the stirring tank 1 of the present invention is mixed and stirred as follows by the interaction of the anchor blades 5 and the inclined paddle blades 6 and the anti-friction plates 7 and 8 which rotate with the rotation of the rotating shaft 4. Be affected. That is, the rotation of the anchor wings 5 along the bottom of the container and the inner circumference of the lower portion causes the liquid around the inner wall to swirl in the rotational direction, so that the liquid near the inner wall is subjected to shearing force and is prevented from adhering to the inner wall. As a result of the swirling by the inclined paddle blades 6 and the application of a component force for upward movement, vertical circulation of the high-viscosity liquid in the container is promoted. In addition, the inclined paddle wings 6
When passing through the position where is attached, arrow B in FIG.
, The liquid that has moved in the circumferential direction of the container is moved in the radial direction of the container, so that mixing in the same plane is promoted. On the other hand, the evil plate 7
Are rotated as a whole by the rotation of the two wings 5,6.
The liquid near the outer circumference that rotates together with the abutment comes into contact with the anti-friction plate 7 and detours inward to generate a vortex, thereby promoting mixing in this portion. The present invention is suitable, for example, for a reaction tank using strong phosphoric acid.

As described above, the high-viscosity liquid in the container is mixed three-dimensionally by the combination of the whole mixing in the horizontal plane and the function of preventing the inner wall adhesion by the anchor blade 5 and the function of moving up and down by the inclined paddle blade 6. Sufficiently performed and adhesion to the inner wall of the container is prevented. In particular, when the heat generated when reacting by mixing and stirring two or more compounds is accompanied by property deterioration, adhesion to the inner wall is prevented as much as possible, and as a result, the water cooling effect of the water cooling jackets 12 and 13 provided on the outer wall is reduced. Is sufficiently improved and a product of stable quality can be obtained. Conversely, when heating is required, this jacket 1
Indirect heating by 2 and 13. In addition, when the anchor blades and the inclined paddle blades are arranged orthogonally, the stirring effect of the arrows A and B in FIG. 2 described above is performed alternately with time, so that the overall uniform mixing effect is further improved. Was confirmed.

[0010]

As described above, in the high-viscosity liquid stirring tank of the present invention, three-dimensional mixing of the liquid in the container is sufficiently performed, and a uniform liquid mixture is obtained. It has an excellent effect that even if the contents have strong physical properties, they adhere little to the inner wall of the container. Further, as a result, the heat exchange between the cooling (or heating) medium of the jacket and the contents of the tank is performed smoothly, so that an excellent product without deterioration in quality can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of a high-viscosity liquid stirring tank of the present invention.

FIG. 2 is a plan view showing an embodiment of a high-viscosity liquid stirring tank of the present invention.

FIG. 3 is an overall vertical sectional view showing an embodiment of a high-viscosity liquid stirring tank of the present invention.

FIG. 4 is an overall vertical sectional view showing another embodiment of the high-viscosity liquid stirring tank of the present invention.

FIG. 5 is a schematic vertical sectional view showing a conventional stirring tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-viscosity liquid stirring tank 2 Container 3 Variable speed motor 4 Rotating shaft 5 Anchor wing 6 Inclined paddle wing 7 Baffle plate 8 Baffle plate 9 Manhole 10 Supply pipe 11 Flash valve 12 Water cooling jacket 13 Water cooling jacket

Continuation of the front page (56) References JP-A-1-168271 (JP, A) JP-A-6-510699 (JP, A) JP-A-63-186293 (JP, U) JP-A-63-186296 (JP) , U) Japanese Utility Model Hei 1-99428 (JP, U) Japanese Utility Model Hei 2-1227 (JP, U) Japanese Utility Model Utility Model Hei 2-125728 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB Name) B01F 7/00-7/32

Claims (2)

(57) [Claims] Claims: 1. A vertical cylindrical container depending on the top center line.
In addition, in a stirring tank having a rotating shaft of a stirring blade connected to a variable speed motor and rotating, an anchor blade sweeping a lower inner peripheral surface of the container on the rotating shaft, and an inclined paddle along the inner peripheral surface of the intermediate portion of the container. A high-viscosity liquid agitation tank having fixed blades and protruding a baffle plate having a vertical surface on an inner wall of the intermediate portion of the container. 2. The high-viscosity liquid stirring tank according to claim 1, wherein the anchor blades and the inclined paddle blades are arranged orthogonally.