JPS5921648B2 - Granulation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for agglomerating fine particles suspended in a liquid by adding an adhesive to the liquid and swirling the liquid.

Conventionally, there is a device of this type as shown in cross section in FIG. 1a.

This is a system in which one or several impellers 1 are mounted on a shaft 2 and rotated within a cylindrical container 3.

A liquid containing fine particles to which a binder has been added is sucked into the granulator 4, rotated by a blade wheel, subjected to a granulation action, granulated to an appropriate particle size, and sent out from a discharge port 5.

FIG. 1 shows a front view of the impeller 1.

However, this shape has the disadvantage that the required power per processing amount is large, and there are two main reasons for this.

(1) In the part where the impeller diameter is small, granulation does not occur and the liquid is simply stirred, resulting in unnecessary energy dissipation.

(2) The impellers in the second and subsequent stages do not effectively contribute to granulation and only consume energy for stirring.

The present invention compensates for the above-mentioned drawbacks and provides a device with higher efficiency and simpler structure.

Furthermore, the present invention also includes a mechanism for controlling product particle size, which is not found in conventional granulators.

The present invention provides a centrifugal pump consisting of a suction part, a pump part, and a discharge passage, and between the pump part and the discharge passage, a rotating cylinder connected to an impeller of the pump part and a granulating part made of a cylindrical casing concentric therewith are provided. This is shown in Fig. 2 as a cross section passing through the axis.

9 is the suction part of the centrifugal pump, 6 is the shaft, 7 is the impeller, 7a
7b is the impeller main plate, 7b is the impeller side plate, and 8 is the casing, which constitute the pump section.

12 is a discharge path.

In the granulation part, a cylinder 10 having the same diameter and concentricity is attached to the impeller main plate 7a of the pump part on the side opposite to the impeller blades.

The end of the cylinder 10 opposite to the impeller main plate 7a is connected to the shaft 6.
It is connected to the discharge side disk 10a attached to the discharge side disk 10a.

A cylindrical casing 8a concentric with the cylinder 10 is attached to the impeller casing 8 in the discharge passage 9.

In this way, a granulation chamber 11, which is also an axial passage for liquid, is formed between the rotating cylinder 10 and the casing 8a.

When the liquid in which the fine particles are suspended is added with heavy oil as a binder, for example, when the fine particles are coal, and the liquid is passed through the pumping action of this apparatus, the mixed liquid swirls in the granulation chamber 11, and the fine particles are transferred to the granulation chamber 11. While being pressed against the inner wall of the nucleus, it is transferred, and during that time it aggregates around the nucleus and a granulation action takes place.

At this point, the swirling component given to the liquid by the impeller is lost due to friction with the casing wall, but this is caused by the rotation of the rotating cylinder 10.
Replenished by

However, if the swirling component is still insufficient, the wing 13 may be attached to the rotating cylinder 10 as shown in FIG. 3a, thereby supplementing the swirling component.

FIG. 3 shows the blade 13 in the AA force direction of FIG. 3a.

If a classification plate 14 is attached to the rotary cylinder 10 at the end of the active particle chamber 11 as shown in FIG. 4a, the particle size of the granulated particles can be sorted.

FIG. 4 shows the shape of the classification plate 14 in the direction of arrow BB in FIG.

At the end of the granulation chamber, particles with larger diameters are moved toward the outer diameter side due to centrifugal force, and therefore pass through the gap between the classification plate 14 and the inner wall of the casing.

On the other hand, particles with a small diameter pass through the inner diameter side, collide with the classification plate 14, and are returned to the granulation chamber 11, where they are subjected to the granulation action again.

In other words, the classification plate 14 functions to sort the particle size and to increase the residence time of the particles in the granulator.

The classification action of granulated particles can also be performed with a structure as shown in FIG.

This is the arrangement of the two cylindrical granulation chambers 11 of the discharge passages 15, 16 which are arranged in parallel and stacked in the axial direction.

A boundary 17 between these two discharge passages 15 and 16 forms a tongue at the end of the granulation chamber 11, and there performs a classification action on the particles.

That is, particles with a large diameter flow into the discharge passage 15 on the outside of the boundary 17 where the liquid gathers on the side with a large turning radius, and the remaining small-diameter particles flow into the discharge passage 16 on the inside.

From the above description, the present invention has the following advantages over the conventional type shown in FIG.

(b) There are no unnecessary energy dissipating parts, and the power required per processing amount is reduced.

(2) Pelletization time is shortened because sufficient swirl is provided within the granulation chamber.

(3) By doubling the discharge path, the particle size of the product can be selected.

Further, this device can be assembled in a cascade to achieve sufficient granulation.

(4) The particle size can also be selected by incorporating a classification plate.

[Brief explanation of drawings]

FIG. 1a is a partially sectional side view of a conventional granulating device, and FIG. 1b is a front view of the same impeller. FIG. 2 shows a granulation device equipped with a granulation chamber according to the present invention. Figure 3a is a granulation device in which blades are attached to a rotating cylinder to give swirl to the flow of agglomerated particles in a granulation chamber, and Figure 3b is a view taken along the line AA in Figure A. Figure 4 a shows a granulation device with a classification plate placed at the end of the granulation chamber, b
This is a view taken along the BB arrow in figure a. FIG. 5 shows a granulation device in which two discharge passages are arranged in parallel and stacked in the radial direction of a rotating cylinder at the end of the granulation chamber. Note that, except for FIGS. 1A and 1B, 3B, and 4S, all are vertical sectional views of the upper half passing through the axis of the rotating cylinder. 1...Blade wheel, 2...Coaxial, total...
・Cylindrical container, 4... Granulator inlet, 5...
... Granulator discharge port, 6 ... Rotating cylindrical shaft, 7 ...
... Impeller, 7a ... Impeller main plate, 8
...Casing, 8a ... Casing concentric with the rotating cylinder, 9 ... Granulation raw material inlet, 10
...Rotating cylinder, 11 ... Granulation chamber, 12
... Particle discharge path, 13 ... Wings, 14.
... Classifying plate, 15, 16 ... Discharge path, 1
7... Boundary between two discharge paths.

Claims (1)

[Claims] 1. A cylinder of the same diameter is attached to the impeller main plate of a centrifugal pump, and the casing of this part is also a cylinder concentric with the rotating cylinder, and the shaft formed between these two cylinders is attached. A granulation device with parallel passages connected to the discharge passage. 2 A cylinder of the same diameter is attached to the impeller main plate of the centrifugal pump concentrically with the main plate of the centrifugal pump, the casing of this part is also a cylinder concentric with the rotating cylinder, and a blade is attached on the rotating cylinder to give swirl to the flow. A granulation device that connects a passage parallel to the axis between two cylinders to a discharge passage. 3 A cylinder concentric with the main plate of the impeller of the centrifugal pump is attached, and the casing of this part is also a cylinder concentric with the rotating cylinder, and the end of the passage parallel to the axis created between these two cylinders is attached to the top of the rotating cylinder. This is a granulation device in which a classification plate is installed in the granulator and this passage is connected to the discharge passage. 4. A cylinder of the same diameter is attached to the main plate of the impeller of the centrifugal pump, and the casing of this part is also installed as a cylinder concentric with the rotating cylinder. A granulation device in which multiple discharge passages are stacked and arranged in parallel in the radial direction of the rotating cylinder.