JPH0615031B2 - Powder processing equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fluidizing method in which air is blown into the container from the bottom of the container to bring the powder into a fluidized state, forming a so-called fluidized bed, and damp powder is dried. TECHNICAL FIELD The present invention relates to a powder processing apparatus for performing processing such as layer drying, fluidized bed granulation for spraying a binding solution to powder to produce particles, or fluidized bed coating for spraying a coating liquid on particles to form a film on the surface of particles. It is a thing.

This device can be widely used in the fields of processing such as medicines, agricultural chemicals, foods, ceramics and other chemical products.

Problems to be Solved by the Invention Conventionally, air is blown from the bottom surface of a cylindrical container to keep powder in a fluidized state, so-called fluidized bed is formed, and then wet powder is dried. BACKGROUND ART Fluidized bed granulation in which a binding solution is sprayed onto powder to form particles, and fluidized bed coating in which a coating solution is sprayed to coat particles are also widely used.

By the way, in the processing by these fluidized beds,
There were three problems.

The first problem is that in the conventional device, the contact effect between air and powder is not always good, and it is difficult to uniformly supply the spray liquid to the powder to wet or coat it. thing.

The second problem is that, in fluidized bed granulation, the deposition of powder by the liquid is suspected, so the bulk specific gravity is smaller than in other granulation operations such as stirring granulation.

The third problem is that there is a problem related to GMP, such as the retention of fine powder in the air introduction part or the drop.

These problems will be sequentially described.

That is, in the commonly used form of fluidized bed, air having a cavity velocity of 1-5 m / sec is blown through a wire net or a punching plate provided substantially in the center of the bottom of the cylindrical container to uniformly powder the powder. Another method is to operate while making the fluid flow, and the other is to install a guide tube in the center of the cylindrical container and blow air into the guide tube at a speed higher than the terminal speed of the powder so that the air is flowing upward in the guide tube. Coat or dry the powder with, and after solid-gas separation in the upper part of the guide tube, lower the outside of the guide tube of the cylindrical container, and at the bottom of the container, again in the guide tube by the air flow from below the guide tube. There is a method in which the machining operation is performed while raising the temperature and forming a circulating flow.

However, in the former method, there is air blowout,
The contact efficiency between air and powder is not always good,
There is a drawback that the movement of the powder is irregular and it is difficult to perform processing uniformly on the entire powder. Further, in the latter method, since a circulating flow is formed, the entire powder can be uniformly processed, but in the guide tube, the spatial density of the powder is small and the air and the powder are in parallel. Since it is a flow, it has a drawback that contact efficiency between powder and air and heat exchange efficiency are poor. Further, since the ratio of the portion to be processed to the total volume is small, there is a drawback that the volumetric efficiency of the device is poor.

Next, in fluidized bed granulation, as an attempt to increase the bulk specific gravity, a stirring blade or a rotary plate is provided at the bottom of the fluidized bed. That is, in Japanese Examined Patent Publication No. 8735/1986, a rotating plate that horizontally rotates at the bottom of a fluidized bed container and an unraveling blade are provided on the rotating plate.
In -164635, the bulk specific gravity is increased by applying mechanical force to the aggregated particles generated in the fluidized bed by the rotating plate, which is also formed by overlapping the ring-shaped plates, and the inclined blades provided on the rotating plate. Although it has been devised and fulfills its purpose for the time being, all of these have complicated mechanisms and it is difficult to wash and dry after operation, and the following problems regarding GMP remain.

Next, I will touch on the GMP problem. Many of the devices used in the past use a method in which the bottom surface of the container is reticulated, a punching plate, or a slit is used to introduce air therethrough, or as shown in Japanese Patent Publication No. 61-7326. An intake port is provided at the center of the bottom surface, and a circular top plate larger than the intake port is mounted on the intake port. Such a method has a drawback that the powder falls to a small amount below the bottom surface of the container.

Further, in order to reduce the fall of the powder, measures have been taken to make the mesh fine, or to provide a top plate on the bottom of the container as close as possible to the bottom of the container on the holes or slits. However, in the method of making the mesh fine, it takes time to completely remove the powder clogging the mesh. Therefore, various problems remain in industries such as medicines and foods, in which so-called GMP is coordinated, and in industries in which cross-contamination is a problem because varieties are frequently switched.

Further, when the top plate is covered with punching, slits or ventilation holes, the top plate should be attached so as to be extremely close to the bottom of the container in order to completely prevent the powder from falling, and JP-A-58-236. As described in Japanese Patent Publication No. 58-11377 and Japanese Utility Model Publication No. 58-11377, the shaft of the air introduced into the container for the purpose of preventing the powder from entering the air passage communicating with the shaft sealing portion. In the method of disposing a shaft seal made of a flexible material between the sealing portion and the outlet of this air into the container body,
It is possible to avoid falling and intrusion of powder,
On the other hand, the top plate and the shaft seal exert a blocking function against the air flow that flows out into the container main body, so that
In addition, it hinders smooth outflow of air. When such an apparatus is used for fluidized bed drying, fluidized granulation, stirred fluidized granulation, fluidized coating, etc., it is difficult to introduce the required amount of air, and the drying conditions for the treated powder pair introduced in the container are Becomes non-uniform and causes deterioration of quality in the finally obtained product due to poor flow of fluid. Further, in order to introduce the amount of air necessary for the flow into the container in such a method, there is a drawback that a high-pressure and large horsepower air supply source is required.

That is, in all of the conventional devices, when trying to prevent the powder being processed from dropping from the container, the introduction part of the air for flow becomes complicated and it is difficult to clean the introduction part of the air. Or, the air passage resistance at the air introduction part becomes large,
There is a problem that it is difficult to introduce a large amount of air into the container.

The object of the present invention is that the contact efficiency between air and powder is good, the powder can be uniformly processed and processed, and particles having a large bulk specific gravity can be formed in the granulation operation. It is to provide an efficient device that does not have

Means for Solving Problems The present invention has been completed as a result of various studies in order to solve the above problems. That is, in a powder processing apparatus that blows air from the bottom of a cylindrical container containing powder to make the powder in a fluidized state, perform processing such as granulation and coating, or dry wet powder. , A hollow frustoconical body having a sloping wall which is hollow and which is closed at the upper side and which is rotatably supported and which is provided at substantially the center of the cylindrical container and which is closed downward And a member that forms an air flow path communicating with an air supply source outside the system below it, and blocks the passage of powder in a truncated cone shape in the middle of the flow path (wire mesh or sintered metal, etc.) And a lower end of the inclined wall of the hollow headed conical body through which air introduced through the member is passed between the hollow headed conical body and a member for preventing passage of the powder of the frustoconical truncated cone shape. Through the gap between the bottom of the cylindrical container and the cylindrical container in the centrifugal direction. There is provided a powder treating apparatus characterized by writing.

EXAMPLES The present invention will be described below based on examples shown in the drawings.

FIG. 1 is a schematic vertical cross-sectional view showing a first specific example of the powder processing apparatus according to the present invention, in which (1) is a cylindrical container and (1a) is the cylindrical container ( 1) A bottom plate provided on the bottom of the bottom plate (1a), and a member (2a) for preventing passage of powder in the shape of a truncated cone, such as a wire mesh or a sintered metal plate, is detachably provided at the center of the bottom plate (1a). . (3) is a hollow strut that is erected upright through the central portion of the member (2a) that blocks the passage of the above frustoconical powder, and a bearing (4) is placed on this strut (3). The pivot shaft (5) is rotatably supported. (6) is a hollow frusto-conical body fixed to the upper end of the pivot (5), and the top of the hollow frusto-conical body (6) is a top plate (6).
It has a shape with a splayed sloping wall (6b) closed in a), and the tip of the sloping wall (6b) is horizontal. The inclined wall (6b) is preferably a curved surface whose inclination gradually decreases in the radial direction. The upper surface of the bottom plate (1a) of the cylindrical container (1) is completely covered by the hollow truncated cone (6), and the inside (6b) of the hollow truncated cone (6) is outside the system. The air flow path (7) communicating with the air supply source (not shown) is communicated with the above-mentioned frustoconical powder blocking member (2a). The air introduced through the member (2a) for preventing the passage of the powder is diffused in the air between the bottom end (6c) of the hollow truncated cone (6) and the bottom plate (1a) of the cylindrical container (1). Gap (8)
It is blown into the cylindrical container (1) at a flow rate of 5 to 30 m / sec in the centrifugal direction.

The powder put into the cylindrical container (1) slides down while rolling in the centrifugal direction along with the rotation of the hollow truncated cone (6), and the bottom end of the hollow truncated cone (6) falls. When it reaches (bc), it rides on the air flow blown out from the air diffusion gap (8) and floats upward in a spiral shape while being dispersed by the air. Then, the powder that has risen appropriately falls in the central portion of the cylindrical container (1), and with the rotation of the hollow truncated cap (6) again, the circulating flow of sliding down while rolling in the centrifugal direction is repeated. Granulation or coating is carried out by adding a liquid by a spray nozzle or the like at an appropriate point of this circulating flow.

In this way, the powder forms a circulating flow, so that each particle is uniformly wetted by the liquid, subjected to a rolling motion by the hollow frustoconical body (6) and then dried in dispersion, in a regular manner. Since it is recycled, uniform processing without spots is possible.

Further, since air is concentrated around the peripheral portion of the cylindrical container (1) which is centrifugally flowing and has a large height of the powder layer, the contact efficiency between the powder and the air is good. Also, the powder is a hollow conical body (6).
Since it is used for rolling operation, the bulk specific gravity increases due to an appropriate consolidation effect.

Also, an air diffusion gap (8) between the bottom end (6c) of the hollow conical body (6) and the upper surface of the bottom plate (1a) of the cylindrical container (1).
By the air flow with a flow velocity of 5-30 m / sec in the more centrifugal direction,
Almost no penetration of the powder under the treatment under the hollow truncated cone (6) is observed.

In the upper part of the cylindrical container (1), a spray nozzle (9) for a granulating liquid or a coating liquid, a
A back filter (10) for solid-gas separation and an exhaust port (11) are attached.

It is unfortunate that the member (2a) for preventing the passage of the powder in FIG. 1 has a truncated cone shape, and the hollow truncated cone (6) is unfortunately used.
The powder that has entered below is also a cylindrical container (1) due to the truncated cone (2a) of the slanted wall (2a) of the member (2a) that blocks the passage of powder.
By a high-speed air flow between the hollow truncated cone (6) and the inclined wall (2b) of the member (2a) that blocks the passage of the powder. , Completely prevent invasion of powder into the shaft seal portion (5a) of the rotatably supported pivot shaft (5). That is, it has the effect of preventing problems that occur in GMP.

FIG. 2 shows an embodiment in which the agitating blade (12) is attached to the hollow truncated cone (6). In the embodiment shown in FIG. 1, a fluidized bed is formed by aeration of the peripheral portion of the cylindrical container (1), a circulating flow is formed by rotation of the hollow truncated cone (6), and an addition for rolling operation is performed. It was shown that the ideal powder treatment can be performed by using the stirring blade (12) in the granulation operation to increase the amount of added liquid to obtain particles with a large bulk specific gravity. Crushing, and
The rolling operation is performed. If you want to obtain more uniform particle size distribution, use the fixed blade (13) on the wall (1b) of the cylindrical container (1).
Should be provided.

FIG. 3 shows an embodiment of the device equipped with means for assisting the air flow between the slanted wall (2b) of the member (2a) blocking the passage of powder and the hollow frustoconical body (6). Then, radial or spiral blades (14) (15) functioning as an outflow promoting member for the air flow are fixed to the inner wall surface of the inclined wall (6b) of the hollow truncated cone (6). This feather (14) (1
5) functions as a pumping member for the air flow similar to the known rotary blades of a blower, and passes through a member (2a) that prevents the passage of powder from the air flow path (7) and a hollow truncated cone (6). The extrusion pressure is positively applied to the air flow entering the inside (6d) of the chamber to promote convective circulation of the air flow supplied into the cylindrical container (1) from the air diffusion gap (8).

FIG. 4 shows a squirt nozzle (16) that opens inside the hollow truncated cone (6) on the inclined wall (6b) of the hollow truncated cone (6).
Shows that they are arranged in an integral structure. There are two types of fumaroles (16a) and (16
b) is drilled. The first fumarole (16a) is bored on the outer wall of the fumarolic nozzle (16) facing the inner wall (1b) of the cylindrical container (1), and the airflow ejected from the fumarole (16a) Cylindrical container (1) with annular curved surface (1
c) and the adhesion of the powder to the inner wall surface (1b) b are prevented. The second fumarole (16b) is bored so as to face the bottom plate (1b) of the cylindrical container (1), and has a function of blowing up the powder that tends to stay in the bottom plate (1a), and a fumarolic nozzle. It has a function of preventing particles from being caught between the (16) and the bottom plate (1a). Furthermore, the air blown into the cylindrical container (1) from these air jet nozzles (16) forms an ideal fluidized bed by synergistic action with the air blown into the cylindrical container (1) from the air diffusion gap (8). Helps to form.
The ratio of the amount of air blown into the cylindrical container (1) from the air diffusion gap (8) to the amount of air blown into the cylindrical container (1) from the air jet nozzle (16) is higher or lower than that of the air truncated cone (6). To adjust.

FIG. 5 shows a baffle (17) provided on the upper surface of a hollow truncated cone (6) as a circulating flow promoting member instead of the stirring blade (12) of FIG. This is useful when the disintegration action in the embodiment is unnecessary or has a bad result.

As is clear from the above description, according to the powder processing apparatus of the present invention, the rotating hollow truncated cone, which is provided in the center of the cylindrical container, and the bottom end portion of the hollow truncated cone and the cylindrical shape. An ideal tumbling flow state due to the circulating flow can be realized by the cooperative action with the air flow flowing out from the air diffusion gap with the bottom of the container, and uniform treatment can be performed on each particle forming the powder layer. .

Further, the air is supplied from a vent whose upper portion is completely covered with an air frustoconical body, and the air flow path is provided with a member for preventing passage of powder having a truncated cone shape. The powder does not flow out of the system at all in combination with the action of the high-speed air flow flowing out of the air diffusion gap.

As described above, since the simple and sufficient function is satisfied, the cleaning after the treatment can be easily and completely performed.

EFFECTS OF THE INVENTION The present invention provides a device having a simple structure and effectively forming a tumbling fluidized phase in fields where GMP has recently become extremely important, such as pharmaceuticals, foods and agricultural chemicals. As a result, it greatly contributes to the development of the industry.

[Brief description of drawings]

1 to 4 are schematic longitudinal sectional views of a powder processing apparatus according to the present invention, and FIG. 5 is a plan view of another embodiment. (1) ... Cylindrical container, (1a) ... Bottom of cylindrical container, (1b) ... Inner wall surface of cylindrical container, (2a) ... Member for preventing passage of powder in a truncated cone shape , (3) …… Post, (4) …… Bearing, (5) …… Axis, (6) …… Hollow truncated cone, (7) …… Air flow path, (8) …… Air diffusion gap , (9) …… Spray nozzle, (10) …… Back filter, (11) …… Exhaust port, (12) …… Stirring blade, (13) …… Fixed blade, (14) (15) …… Blade , (16) …… Fume nozzle, (17) …… Baffle.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI technical display location F26B 3/08 9140-3L (72) Inventor Hiroshi Sakamoto 1-6, Tsubohoncho, Nishi-ku, Osaka-shi, Osaka No. 6 Fuji Industrial Co., Ltd. (72) Inventor Katsuhiro Inoue 1-6-6 Tsubuhoncho, Nishi-ku, Osaka City Osaka Prefecture No. 6 Fuji Industry Co., Ltd. (72) Inventor Yoshiyuki Asaba 1-6, Tsubuhonmachi, Nishi-ku, Osaka City, Osaka Prefecture No. 6 Fuji Industrial Co., Ltd. (72) Inventor Kenichi Kasuya 1-6-6 Tsubuhoncho, Nishi-ku, Osaka City, Osaka Prefecture

Claims (1)

[Claims] Claims: 1. A powder in which air is blown from the bottom of a cylindrical container containing the powder to make the powder in a fluidized state and to be subjected to treatments such as granulation and coating, or to dry wet powder. In the processing apparatus, a hollow frustoconical body having a hollow, upwardly closed, downwardly sloping inclined wall is provided on a rotatably supported pivot provided at substantially the center of the cylindrical container. An air flow path that is fixedly attached and communicates with an air supply source outside the system is formed at the bottom of the flow path, and a member that blocks the passage of powder in the shape of a truncated cone is provided in the middle of the flow path. The air blown through the hollow headed cone and a member that blocks the passage of powder in the shape of a truncated cone, and the gap between the lower end of the hollow headed cone and the bottom surface of the cylindrical container. Powder treatment characterized by being blown into the cylindrical container in a centrifugal direction from the Location.