JPS61165577A - Continuous fluidized-bed granulating drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a floor plate in a continuous fluidized bed granulation dryer, and particularly to a bed plate formed with a large number of slit-shaped nozzles oriented in the same swirling direction. The present invention is further characterized in that the floor plate is rotatable.

(Prior art) A continuous fluidized bed granulation dryer granulates the powder by making the powder into a fluidized state on a fluidized bed5, and then spraying a binder solution thereon to agglomerate the powder and dry. It is. In this equipment, the powder and granules are granulated in a floating state in the hot airflow blown up from below without receiving almost any external force during the granulation process, so the granules have relatively large variations in particle size and are irregularly shaped. It becomes porous.

Therefore, when trying to obtain heavy, uniformly sized spherical particles of pharmaceuticals, foods, industrial chemicals, etc., it is necessary to rotate the floor plate or provide a rotor disk on the floor plate and rotate it. This will create a swirling flow in the tank, which will apply centrifugal force to the powder and granules, increasing the rubbing action and rolling action between the powder and granules and between the powder and the tank wall. An attempt was made to do so.

However, in the former method of rotating the floorboard (for example, Japanese Patent Publication No. 59-21651), the particles blown upward by the wind are suspended, so contact with the floorboard is not very good, and the rotation speed of the particles is determined by the rotational speed of the floorboard. much slower than . Therefore, although rolling and rubbing action occurs between the powder and the tank wall and between each other, making it heavier and spheroidized, this action hardly occurs between the powder and the floor plate. Therefore, its effectiveness is low. Another problem with the conventional method is that powder and granules leak from the gap between a part of the rotor and the tube wall due to turbulence when the machine is stationary or during operation, which is a major problem in terms of product quality and sanitary properties. . or,
The latter method of rotating the rotor disc (for example,
4-62978), the rotor disk is placed on a perforated floor plate, and the rotor also has holes, but most of the hot air blown up from the floor plate passes through the gap between the floor plate and the rotor, and the rotor disk is placed on a perforated floor plate. As a result, the function of the floor plate, which is the essence of a continuous fluidized bed granulation dryer, is greatly impaired, making it impossible to obtain uniform granules.

(Means for solving the problems) The present invention solves the above-mentioned conventional drawbacks,
The floor plate has a large number of slits formed in the same rotating direction, and is rotatable around the center of the disc, and by adjusting the rotation speed, a rolling motion is created between the floor plate and the powder. The particle size regulating effect is enhanced by this.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

In the figure, reference numeral 1 is a fluidized chamber which is the main body of the dryer, and 2 is a fluidized bed. A blower 3 is connected below the fluidized bed 2, and hot air sent from the blower 3 is passed through the fluidized bed 2 into the fluidized chamber 1. It seems to be gushing into the air. A duct 4 is attached to the upper end of the flow chamber 1, and an exhaust fan 5 is connected to the exhaust duct 4. Exhaust gas enters the exhaust fan 5 through the exhaust duct 4 and is discharged into the atmosphere. Reference numeral 6 denotes an input conveyor for inputting powder or granular material to be dried into the machine, and reference numeral 7 denotes an outlet for taking out the dried material outside the machine. As shown in FIG. 3, the fluidized bed 2 is formed by a floor plate in which a large number of slit-shaped nozzles 9 are opened in a donut-shaped area around the central part and in the same swirling direction. is also connected to a drive motor 10 to rotate at an appropriate speed. Further, below the fluidized bed 2, a donut-shaped perforated plate 8 is attached to the tube wall.

This perforated plate 8 is used to prevent powder particles from falling from a slight gap between the outer peripheral edge of the fluidized bed 2 and the tube wall, and to prevent this from occurring. Although the diameter of the fluidized bed 2 depends on the angle of repose of the powder, it is formed smaller than the diameter of the fluidized bed 2, so that the two are slightly overlapped.

To further explain the fumarole 9, for example, as shown in FIG.
1 and the fan-shaped valley-fold fins 12 are opened at equal radial intervals and in the same turning direction,
The downwardly inclined surface on one side of the mountain-folded fins 11 and the upwardly inclined surface on the other side of the valley-folded fins 12 are overlapped with each other with an appropriate interval, and this becomes the blowhole 9. To explain another example of a blowhole, as shown in Fig. 4, the hot air blowing up is press-formed to have directionality, and by making the direction of the hole tangential, the hot air blowing up has a swirling property. A method may also be taken to have it.

(Function) When granulating powder using the continuous fluidized bed granulation dryer configured as described above, hot air is blown out from the blowhole 9 and the floor plate is rotated. Now, the hot air jet speed is b
, the rotation speed of the floor plate in the opposite direction is V, then the powder in the tank is subjected to a rolling action whose relative speed to the rotation of the bed is approximately b+v. By blowing out the necessary amount of hot air according to the physical properties of the powder and granules and the amount of input, and adjusting the rotation speed of the bed plate appropriately, it is possible to create a fluidized bed between the powder and granules, between the powder and the floor, or clearly with a rotating slit. The effect of increasing weight due to rotation is observed.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view showing the main parts of the same, Fig. 3 is a partially exploded perspective view showing an example of a fluidized bed, and Fig. 4 is a fluidized bed. FIG. 5 is a plan view showing another example, FIG. 5 is a longitudinal cross-sectional view showing the essential parts of the same, and FIG. 6 is a correlation diagram between particle uniformity and water content. 1; fluidization chamber 2; fluidized bed 3; blower 4; dust 5; wandering fan 6; input conveyor 7; outlet 8; porous plate 9; blowhole 10; drive motor 11;
Fin 12; Fin Fig. 1 ↑ Fig. 2 Fig. 3 Fig. 4 Fig. 5 λ

Claims (1)

[Scope of Claims] 1. A large number of slit-shaped nozzles are opened in a donut-shaped area around the bed plate constituting the fluidized bed in the same swirling direction, excluding the central part, and are rotatable. A continuous fluidized bed granulation dryer characterized by being connected to a motor and rotating at an appropriate speed. 2. The continuous fluidized bed granulation dryer according to claim 1, characterized in that a donut-shaped perforated plate having an inner diameter at least smaller than the outer diameter of the floor plate is attached to the tube wall below the floor plate.