JPH0464267B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is used to produce pharmaceuticals, foods, chemicals, etc., and is used to make powder or granules into a floating fluid state and perform granulation, coating, mixing, Or it relates to a fluidized bed granulation drying device used for drying.

[Conventional technology]

Flowing air is passed into the container through numerous holes formed at the bottom of the container, and the flowing air transforms the powder and granules contained inside the container into a suspended fluid state, thereby mixing the powder and granules. or dry it,
Alternatively, there is a conventionally known fluidized bed granulation drying apparatus that granulates or coats the powder while spraying a granulating or coating liquid onto the powder in the floating fluid state. There is.

As shown in FIG. 7, this type of fluidized bed granulation/drying apparatus consists of a hopper-shaped container 1 containing powder and granules;
A rubber packing 2 is provided around the flange of the lower end opening of the container 1, and two punching plates 3 are provided below the rubber packing 2 as necessary to close the lower end opening of the container 1. 4, a wire mesh 5 interposed between these punching plates 3 and 4, a rubber gasket 6 that supports the outer circumference of the lower punching plate 4 from below, a support member 7 that supports this rubber gasket 6 from below, etc. We are prepared.

In such a fluidized bed granulation/drying apparatus, when fluidized air passes from the bottom to the top of the punching plate 4, the powder and granules housed in the hopper-shaped container 1 become suspended and fluidized. As a result, the powder or granules are mixed or dried. In addition, when granulating or coating the above-mentioned powder or granules, a spray nozzle (not shown) is arranged at a position slightly above the upper end opening of the above-mentioned container 1, and a liquid for granulation or coating is supplied from this spray nozzle. is sprayed to granulate or coat the powder in a suspended fluid state.

In the above device, a wire mesh 5 is interposed between the punching plates 3 and 4 so as to close the opening at the lower end of the container 1, thereby directing the flowing air flowing upward to the punching plate 3. 4 and wire mesh 5 into the container 1, and is configured to prevent the powder and granular material in the container 1 from falling through the holes.

[Problem that the invention seeks to solve]

However, since the punching plates 3 and 4 are manufactured by punching a single plate, it is not possible to form holes with an extremely small diameter of, for example, about 0.1 mm. In this way, if the opening diameter of the punching plates 3 and 4 is large, the powder will fall through the hole, so in practice, the wire mesh 5 is used to form extremely small holes to remove the powder. This will prevent the granules from falling, but in this case, the wire mesh 5 is weak in strength and easily damaged, so if necessary, the wire mesh 5 is held by sandwiching the top and bottom with two punching plates 3 and 4. It is required to do so.

However, in a multi-layer structure in which a wire mesh 5 is interposed between two punching plates 3 and 4, the structure becomes complicated, and as long as the wire mesh 5 is used as described above, the durability is poor. 5. Requires periodic replacement. Furthermore, the complicated structure tends to cause foreign matter to get mixed in during cleaning, assembly, or use.

Further, the holes of the punching plates 3 and 4 described above are vertically formed as shown in FIG. 8, and the shape of the peripheral wall of the hole of the wire mesh 5 is also Although it is more rounded than the holes, it also has a lattice shape, and has a shape similar to the holes of the punching plates 3 and 4.

Therefore, the flowing air flowing upward from the bottom collides with the punching plates 3 and 4 and the wire mesh 5, making it difficult for the flowing air to enter through these holes, and the flowing air enters the container 1 through the holes. As a result of the smooth flow being inhibited and the flow rate becoming slow, it becomes difficult to obtain a uniform suspended fluid state of the powder and granules.

In addition, as described above, if the flowing air is difficult to enter the holes of the punching plates 3 and 4 and the wire mesh 5, the pressure inside the container 1 of the flowing air flowing through the holes is suppressed to a low level, and the flow rate is also reduced. This slows down the drying process, so if a wet material to be dried is stored, or when powder is moistened by a granulating or coating liquid sprayed onto the powder or granule when it is granulated or coated. When particles enter the holes of the punching plates 3 and 4 or the holes of the wire mesh 5, they tend to clog. If such clogging occurs, a uniform flow of fluidized air cannot be obtained, and therefore, even if the powder particles are in a floating fluid state, an uneven fluid state will result.

Such a non-uniform flow state of the powder or granule is called a phenomenon in which the powder or granule moves upward. This uneven lifting phenomenon of powder and granules occurs because the flow velocity of the fluidized air is not constant and uniform fluidization pressure cannot be obtained from the entire surface of the multilayer structure, and the fluidized air flows locally and strongly. It is. When the fluidizing air flows locally in this way, cavities are created at the locations where the fluidizing air flows, and the powder particles are forced to the outside of these cavities, resulting in an uneven fluid state.

For this reason, in the past, the actual situation was that the machine had to be stopped midway through the process to perform intermediate maintenance such as stirring the material to be dried.

If the above-mentioned uneven lifting phenomenon occurs, it becomes impossible to mix the powder or granules sufficiently or dry the granules in a short time, and when granulating or coating the powder, Also causes variations in particle size and coating.

In addition, if the hole shape is as described above,
The structure is complex, which not only causes foreign matter to get mixed in, but also slows down the flow velocity of the flowing air, and furthermore, the rectifying effect becomes uneven due to clogging of the holes, so in order to obtain a uniform flow, This method had many problems, including the inability to respond to fluctuations in the amount of powder and granular material charged.

[Means for solving problems]

In order to solve the above-mentioned problems, the fluidized bed granulation drying apparatus of the present invention is capable of granulating, coating, mixing, or drying powder and granules in a container by making them into a floating fluid state using fluidized gas. In the drying device, a large number of rectifying rods are arranged between the inner circumferential walls of the opening of the outer frame, the width of the lower surface is smaller than the width of the upper surface, and the cross-sectional shape is such that part or all of the side surfaces are inclined from the bottom to the top. The rectifier plates are installed parallel to each other with a gap large enough to prevent the powder from falling, and the rectifier plates formed in this way are arranged so as to close the opening at the lower end of the container. There is.

Each of the above-mentioned rectifying rods has an inverted triangular cross-sectional shape or a similar shape, and its upper surface is generally flat, and the gap between adjacent upper surface portions is within the range of 0.05 mm to 5 mm. and the aperture ratio of the current plate is set within the range of 5% to 50%.

[Effect]

With the above configuration, it is possible to set the gap between the upper surface portions of adjacent rectifier rods in the rectifier plate to an arbitrary interval of about 0.05 to 5 mm. This results in
By setting the gap between the upper surfaces of the rectifying rods to be narrower than the particle size of the granular material, it is possible to reliably prevent the granular material from falling through the gap between the rectifying rods.

Further, each of the current regulating rods of the above-mentioned current regulating plate has an extremely thin rod-like shape, so that it is strong and difficult to break. Therefore, it not only has excellent durability and does not require periodic replacement, but also eliminates the need to adopt a conventional multi-layer structure, which can suppress the contamination of foreign substances and reduce costs. becomes possible.

Furthermore, since each straightening rod in the straightening plate has the above-mentioned cross-sectional shape, the flowing gas passing upward is branched at the lower end of each straightening rod, and is guided by the side surface of the straightening rod, while being guided by the side surface of the adjacent upper surface. Since the fluid gas is sent into the container through the gap between the parts,
The straightening rod allows the flow to flow smoothly without much obstruction, resulting in a uniform suspended flow state of the powder and granules.

As a result, the wet powder or granule used when drying a wet material to be dried, or the granulation or coating liquid that is sprayed onto the powder or granule when granulating or coating the powder or granule. There is no longer any risk of wet powder particles entering the gaps between the adjacent upper surfaces of each rectifying rod and causing clogging, and the high flow rate and uniform blowing pressure of the flowing gas eliminates the risk of clogging. A stable floating fluid state of the powder and granules can be obtained, and the phenomenon of the powder and granules rising upward can be avoided.

As a result, it is possible to thoroughly mix the powder and granules and dry them in a short time without requiring intermediate care, and when granulating or coating the powder or granules, it is possible to A certain amount of product will be obtained.

Moreover, since the flow rate of the fluidized gas is faster and more uniform than in the past, it is possible to easily respond to fluctuations in the amount of powder and granules charged, and it is also possible to improve productivity.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

As shown in Fig. 1, the fluidized bed granulation drying device
It has a hopper-shaped container 10 that can contain powder and granules, and a continuous filter cylinder 11 that is concentric and has the same diameter is connected to the container 10. A filter 12 for collecting fine powder is provided in the chamber. An exhaust pipe 13 is connected to the top of the filter cylinder 11, and a blower 14 is provided on the exhaust pipe 13, and the air that has passed through the filter 12 and is filtered is discharged to the outside by the blower 14. It is configured as follows.

On the other hand, the hopper-shaped container 10 is connected to a passage wall 15 constituting a fluidizing air supply path through a fluidizing air rectifying means shown in FIG. 2, and the fluidizing air supply side of this passage wall 15 is equipped with a fluidizing air supply means 16 and a filter 1 at the air intake port.
A fluidizing air supply device 18 provided with 7 is connected. Note that the type of gas sent into the above device is not limited to the above-mentioned air, and may be a gas other than air. Further, the fluid air flowing upward into the container 10 is supplied to the blower 1
Flowing air may be generated by using the suction force of 4, or by generating pressurized air using the fluidizing air supply means 16 or the like.

When the above fluidized bed granulation/drying apparatus is used as a granulation machine or a coating machine, as shown in FIG. A spray device 22 is provided which sprays the powder and granules in a floating and fluid state within the container 10 using a spray nozzle 21 disposed slightly above the upper opening of the container 10.

Specifically, as shown in FIG.
A rectifying plate 26 is provided so as to be interposed between two rubber gaskets 24 and 25 provided around the flange of the lower end opening of the container 10 and to close the lower end opening of the container 10.

As shown in FIGS. 3 and 4, the baffle plates 26 are arranged in parallel at predetermined intervals (specifically, 25 mm intervals, for example) inside the ring-shaped outer frame 27. A large number of support rods 28... are arranged perpendicularly to these support rods 28..., and each support rod 28...
8... has a large number of rectifying rods 29 supported above, both ends of each of the supporting rods 28... and the rectifying rods 29... are installed between the inner circumferential walls of the opening of the outer frame 27, Fixed by welding or embedding. Note that when the rectifier plate 26 has a large diameter, a large number of support rods 28 are provided to support each rectifier rod 29 from below, as described above, but when the rectifier rod 26 is small, can be sufficiently ensured with only the rectifying rods 29, so the above-mentioned support rods 28 do not need to be provided.

The above-mentioned rectifying rods 29 are arranged parallel to each other at predetermined intervals. In addition, each rectifier rod 2
9... has a width of the lower surface portion 29b, that is, the lower surface width is smaller than the width of the upper surface portion 29a, that is, the width of the lower surface, and both side surfaces 29c, 29c have a cross-sectional shape that slopes from the lower end to the upper end. Specifically, as shown in FIG. 4, the cross section has an inverted triangular shape.

In addition, each rectifying rod 29 in the above-mentioned rectifying plate 26...
The cross-sectional shape is not limited to the inverted triangular cross-section shown in FIG. Bye. For example, as shown in FIG.
As shown in Figure b, the width of the lower surface 29b of the rectifying rod 29 is made slightly larger, and both side surfaces 29c and 29c are formed into gentle slopes from the lower end to the upper end. Slanted surfaces 29e and 29e from the midsection to the upper end of the rectifying rod 29
Even if it has a shape similar to such an inverted triangle, it can perform almost the same function.

Further, the upper surface portion 29a of the rectifying rod 29 has a generally flat surface shape to prevent powder from falling when it comes into contact with the upper surface portion 29a.
The upper surface portion 29a may have a similar shape to a flat surface, such as a slightly concave spherical surface or a slightly convex spherical surface.

Furthermore, the gap S between the adjacent upper surface portions 29a, 29a of each straightening rod 29 arranged in parallel is set to an interval between 0.05 mm and 5 mm to prevent powder particles from falling.
It is set according to the type of powder or granular material within the range of mm. Specifically, the width is set to be as small as, for example, about 0.1 mm, although it depends on the size of the powder particles.

Further, the upper surface width W of each rectifying rod 29 is, for example,
The height H of the rectifying rod 29 is set to 1.0 mm.
For example, it is set to 2.0 mm, but these setting values are not limited.

If the width W of the top surface of each straightening bar 29 is set to 1.0 mm, and the gap S between the top surfaces 29a and 29a of adjacent straightening bars 29 is set to 0.1 mm, the open area ratio of the straightening plate 26 will be approximately 9%. . The aperture ratio of the current plate 26 is set within a range of 5% to 50%, taking into consideration the size and type of particles of the granular material.

As described above, if the cross-sectional shape of each straightening rod 29 in the straightening plate 26 is an inverted triangle or a similar shape, the flowing air passing through the straightening plate 26 will be , each rectifying rod 29...
The rectifying rods 29...
The upper surface parts 29a, 29a of the rectifying rods 29, 29 that are adjacent to each other while being guided by the inclined side surfaces 29c of the
It is sent into the hopper-shaped container 10 through the gap S formed between them.

At this time, the flowing air is guided toward the gap S while being guided by each straightening rod 29...
The air blows up from this gap S efficiently at a high flow rate, and the air blows up from each gap S at a uniform pressure. Furthermore, since the gap S has a continuous shape, the above function becomes even more remarkable. Therefore, the upper surface portion 29a of each rectifying rod 29...
The powder and granules stored inside the hopper-shaped container 10 with a bottom surface are in a uniform and stable floating fluid state, and even when drying a wet material to be dried, or when the powder or granules are granulated. Even if it becomes wet due to the liquid 19 for use or coating, clogging is reliably avoided.

As a result, the powder and granules are reliably mixed in a uniform and stable floating fluid state without requiring intermediate care, and dried in a short time. By spraying the granulation or coating liquid 19 from the particles, it becomes possible to perform granulation with a substantially constant particle size or uniform coating.

Moreover, since the flow rate of the fluidized air is faster and more uniform than in the past, it is possible to easily respond to fluctuations in the amount of powder and granules charged, and it is also possible to improve productivity.

〔Effect of the invention〕

As described above, the fluidized bed granulation/drying device according to the present invention is a fluidized bed granulation/drying device that granulates, coats, mixes, or dries the powder or granules in a container in a suspended fluid state using a fluidized gas. Between the inner circumferential walls of the opening of the outer frame, there are a number of rectifying rods whose bottom width is smaller than the top width and whose cross-sections are sloped from the bottom to the top with part or all of both sides. The containers are constructed parallel to each other with a gap that prevents them from falling, and the rectifier plates formed in this manner are arranged so as to close the opening at the lower end of the container.

This makes it possible to arbitrarily set the gap between the upper surface portions of adjacent rectifier rods on the rectifier plate to an extremely small interval depending on the particle size of the powder or granular material in the container. Furthermore, each of the current regulating rods of the above-mentioned current regulating plate has a strong shape, so that it is difficult to be damaged. Therefore, it not only has excellent durability and does not require periodic replacement, but also eliminates the need to adopt a conventional multilayer structure, which can suppress the contamination of foreign substances and reduce costs. becomes possible.

In addition, since each straightening rod in the current plate has the above-mentioned cross-sectional shape, the flowing gas passing through this current plate is branched at the lower end of each straightening rod, and is guided by the side of the straightening plate to the adjacent one. The powder is sent into the container through the gap between the upper surfaces and flows smoothly at the feeding flow rate, thus ensuring a uniform floating and fluid state of the powder and granules.

Therefore, there is no risk that powder or granules moistened by the granulation or coating liquid will enter the gaps between the adjacent upper surfaces of each straightening rod and cause clogging, and the flow rate can be increased. By the uniform blowing up pressure of the fluidized gas, a uniform and stable suspended fluid state of the powder and granules can be obtained, and the phenomenon of the powder and granules rising upward can be avoided.

As a result, it is possible to thoroughly mix powder and granules and dry them in a short time without requiring intermediate care, and when granulating or coating powder or granules, it is always possible to A certain amount of product is obtained.

Furthermore, since the flow rate of the fluid gas is faster and more uniform than before, it can easily respond to fluctuations in the amount of powder and granules charged, which has excellent effects such as improving productivity. play.

[Brief explanation of the drawing]

1 to 6 show embodiments of the present invention, in which FIG. 1 is a schematic diagram of a fluidized bed granulation drying device, FIG. 2 is an enlarged vertical cross-sectional view of its main parts, and FIG. is a plan view of the current plate, FIG. 4 is an enlarged cutaway perspective view of the main parts of the current plate, FIGS. It is an explanatory view showing the flow of flowing air passing between each straightening rod. 7 and 8 show a conventional example, in which FIG. 7 is an exploded perspective view of essential parts of a fluidized bed granulation dryer, and FIG. 8 is an explanation showing the flow of fluidized air passing through a punching plate. It is a diagram. 10 is a container, 26 is a rectifying plate, 27 is an outer frame portion, 2
8 is a support rod, 29 is a rectifying rod, 29a is an upper surface of the rectifying rod, 29b is a lower surface of the rectifying rod, 29c is a side surface of the rectifying rod, and S is a gap.

Claims (1)

[Scope of Claims] 1. In a fluidized bed granulation/drying device that granulates, coats, mixes, or dries powder or granules in a container in a suspended fluid state with a fluidized gas, between an opening of an outer frame and an inner circumferential wall, A large number of straightening rods, each having a lower width smaller than the upper width and a cross-sectional shape in which part or all of both sides are sloped from the bottom to the top, are parallel to each other with a gap large enough to prevent powder from falling. A fluidized bed granulation/drying apparatus characterized in that the rectifying plates formed in this manner are installed in parallel with each other and are disposed so as to close a lower end opening of the container. 2. The fluidized bed granulation and drying apparatus according to claim 1, wherein each of the straightening rods has a cross-sectional shape of an inverted triangle or a shape similar to this. 3. The fluidized bed granulation and drying apparatus according to claim 1, wherein each of the straightening rods has an approximately flat upper surface. 4. The fluidized bed granulation/drying apparatus according to claim 1, wherein a gap between adjacent upper surface portions of each of the straightening rods arranged in parallel is set within a range of 0.05 mm to 5 mm. 5. The fluidized bed granulation and drying apparatus according to claim 1, wherein the aperture ratio of the baffle plate is set within a range of 5% to 50%.