JP2001000817A - Filter and filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute both operations in parallel by executing filtering operation at whole filter space at ordinary time and also executing removing operation of the clogging of a filter at only the part filter space at back washing time by dividing the inside space of the filter in which gas passes into plural spaces. SOLUTION: The gas is conduced by a duct 3, purified by a purifying filter 4 and kept in a prescribed temp. by a heat exchanger 5, then supplied into a granulating cylinder 1 from a perforated plate 2 to fluidize powdery particles. A bonding soln. or a coating soln. is sprayed from a spray nozzle 6 to execute the granulation or coating of the powdery particles. Thereafter, the gas is passed through the filter 12 and discharged from a duct 8. At the time of blowing off the fine powder stuck to the filter 12, pulse air is jetted from a spray nozzle 10a at one side filter space A divided into two by a partition member 16 to back wash for example. At this time, the gas is passed through the other side filter space B to continue the filtering operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for separating fine particles such as powders and granules fluidized by a gas flow from a gas, and a filter device provided with a function for removing clogging of the filter. About.

[0002]

2. Description of the Related Art In an apparatus for handling fine substances such as powders and granules, for example, fine substances such as granules are fluidized and handled by a gas flow. For example, in the fields of pharmaceuticals, cosmetics, foods, etc., fluidized bed apparatuses are used in various processes such as granulation, coating, mixing, and drying of granules. It is being mobilized and handled.

[0003] The fluidized bed apparatus is provided with a filter for separating the gas used for fluidization from the fluidized granular material. The powder material fluidized by the gas flow is
It is separated by a filter medium such as a filter cloth constituting the filter, and only the gas is separated and discharged to the outside of the fluidized bed apparatus.

In the above-mentioned filter, usually, in order to prevent clogging of the filter medium, fine powder adhering to the filter medium is appropriately removed. By appropriately removing the fine powder, deterioration of the filter function of the fluidized bed apparatus is prevented.

FIG. 7 shows an apparatus disclosed in Japanese Patent Publication No. 5-85213 as a conventional example of a mechanism for removing fine powder. This device is a fluidized bed device for granulation used in the pharmaceutical field and the like.

[0006] In the case shown in FIG.
Are provided substantially upright. The bottom side of the granulation cylinder 1
It is closed by the perforated plate 2.

The gas for fluidizing the granular material is purified through a cleaning filter 4 in a duct 3, then heated or cooled to a desired temperature by a heat exchanger 5, and then passes through the perforated plate 2. And supplied into the granulation cylinder 1. The powder is fluidized by the gas flow.

[0008] A spray nozzle 6 is provided in the granulation cylinder 1, and the granulation or coating of the granular material is performed by the binding liquid or the coating liquid atomized by the spray nozzle 6.

A filter 7 is provided in the granulating cylinder 1,
The gas used for fluidization is separated from the granular material by the filter 7. In the case shown in FIG. 7, the filter 7 is constituted by bag filters 7a, 7b, 7c, and the separated gas is discharged to the outside air by the duct 8. Further, an explosion pressure releasing cover 9 is provided on the upper part of the granulation cylinder 1 for safety against explosion.

In the bag filters 7a, 7b, 7c,
In order to appropriately remove the clogging of the filter medium, fine powder attached to the filter medium is removed. Above each of the bag filters 7a, 7b, 7c, a pulse jet nozzle 10 is provided, and fine powder is removed by pulse air ejected in a direction opposite to the gas flow used for fluidization. This is called "backwashing".

In the apparatus shown in FIG. 7, a venturi tube 11 is provided on each of the bag filters 7a, 7b, 7c so that pulsed air can be effectively applied.

In order to remove fine powder with this configuration, for example, a clogging removal operation is performed by ejecting pulsed air toward the bag filter 7a. Other bag filters 7
Filter work is continued without stopping b and 7c. In FIG. 7, the flow of the pulse air is indicated by thick arrows,
The gas flow was indicated by thin arrows.

In Japanese Utility Model Laid-Open Publication No. 51-111271, a cleaning chamber above a filter is divided into a plurality of sections, dampers are provided for each section, and the dampers are alternately opened and closed. An apparatus for performing washing is disclosed.

Furthermore, Japanese Utility Model Publication No. 2-48028, Japanese Patent Publication No. 24532, and German Patent No. 265451.
Japanese Patent Application Publication No. 9A discloses an apparatus for dividing a filter chamber, providing a damper for each section, and alternately closing the sections to perform shaking.

[0015]

As described above, when removing fine powder in order to remove clogging of a filter, a conventional method may be used regardless of the pulse air method or the shaking method. In the filter system, the filter operation is stopped in the filter that performs the operation of removing fine powder.

When a plurality of filters are provided as in the above conventional example, only the filter for removing fine powder is stopped, and the others are operated as they are.
Assuming that only one filter is provided, when fine powder is removed by pulse air, the filter work is temporarily suspended and the flowing air is also stopped instantaneously, so the flow state is constantly unstable, A good fluidized bed cannot be maintained continuously. In the case where there is only one filter, it is impossible to remove by shaking without such a damper.

In the example shown in FIG. 8, in a fluidized bed apparatus having substantially the same configuration as that shown in FIG. 7, a flow damper 8a is provided in the duct 8 in order to enhance the effect of removing the filter when one filter 7 is provided. Then, the flow of the gas and the spraying from the spray nozzle 6 are stopped, and the pulse air is jetted from the pulse jet air nozzle 10. In this case, it is also possible to remove by shaking.

However, in such an operation method, the filter operation must be completely stopped every time the cleaning operation is performed, so that not only the operation efficiency of the fluidized bed apparatus is extremely poor, but also the flow is periodically stopped. The quality of the resulting product is also poor.
Therefore, a filter device having a single configuration provided with only one filter cannot obtain a good fluidized bed regardless of the operation method, and has a great disadvantage in both product quality and operation efficiency.

In a small-scale device, only one filter is provided. Even in such a case, it is necessary to develop a technique capable of removing the clogging of the filter without completely stopping the filter operation. Thought. In addition,
Even if a small-scale apparatus is provided with a plurality of filters, such a problem does not occur. However, in order to obtain the same filtration area, the installation area is increased with a plurality of filters, and the apparatus is not compact.

An object of the present invention is to enable a filter operation and a clogging operation to be performed in parallel in the same filter.

[0021]

SUMMARY OF THE INVENTION The present invention is directed to a gas separation filter for separating fine particles fluidized by a gas from the gas, wherein an internal space of the filter through which the gas passes is provided. Is divided into a plurality of filter spaces, usually in all the filter spaces of the plurality of filter spaces, a filter operation for separating the gas and the fines is performed, at the time of backwash, the selected filter The pulse air is jetted only in the space, and the clogging removal operation of the filter is performed.

[0022] The filter space may be divided by the gas-impermeable partition member. The filter may be configured as a cartridge type filter or a bag filter.

A filter device according to the present invention is a gas ejection nozzle for selecting a filter having any one of the above-mentioned structures and any one of a plurality of filter spaces of the filter, and ejecting pulsed air into the selected filter space. In the filter space selected from among a plurality of filter spaces in the same filter, the clogging removal operation is performed by removing the deposits on the filter by the pulse air, and in another filter space, It is characterized in that a filter operation for separating gas and the fine substance can be performed.

The above-mentioned filter device may be provided in a fluidized bed device such as a granulating device, a coating device, a mixing device, and a drying device for handling powder or granular material.

In the filter having the above structure, the inside is divided into a plurality of filter spaces, so that the pulse air is selectively provided in a part of the plurality of filter spaces independently of other filter spaces. Can be spouted.

For this reason, in the divided space where the pulse air is jetted, the clogging is removed by removing the fine powder, and the filtering operation of the gas and the fine material fluidized by this gas is performed in the other space. Can be continued in parallel.

In order to selectively eject pulsed air, gas ejection nozzles are provided for each of a plurality of filter spaces, and a gas ejection nozzle for ejecting pulsed air can be selected by opening and closing a valve. May be configured.

Alternatively, it is conceivable that at least one of the gas ejection nozzle and the filter is configured to be movable so that the gas ejection nozzle can be positioned in an arbitrary filter space of a plurality of filter spaces.

Alternatively, both the gas ejection nozzle and the filter are fixedly provided, and the nozzle direction of the gas ejection nozzle is swung, and a filter space for ejecting pulse air in the oscillation direction can be selected. Is also conceivable.

[0030] Examples of the fine substance include powder, powder, and the like, as well as dust and dust that are fluidized by gas.

With the filter having the above configuration, even if the fluidized bed apparatus is provided with only one filter, the fine powder can be removed without stopping the entire filter operation. Needless to say, the configuration in which a plurality of filter spaces of the present invention are provided for each filter of the fluidized bed apparatus provided with a plurality of filters can be applied.

That is, since the clogging removal operation and the filter operation can be performed in parallel by using the same filter, regardless of whether one or a plurality of filters are provided, a fluidized bed apparatus using such a filter can be used. The operation efficiency can be improved, and disadvantages due to the stoppage of the flow can be avoided.

When the internal space of the filter is divided into a plurality of filter spaces, for example, a partition member that does not allow gas to pass through may be provided in the internal space. When the filter is configured as a cartridge type filter, a partition member may be provided in the filter from the beginning and divided into a plurality of filter spaces.

Alternatively, instead of providing the partition member in the interior space of the filter in a fixed manner as described above, the partition member and the filter are configured separately from the beginning, and the filter may be mounted as necessary when the filter is mounted. Alternatively, a partition member may be detachably attached to the filter so that a plurality of filter spaces can be configured.

With this configuration, even if the service life of the filter medium and the partition member is different from each other, the members that do not reach the service time can be reused, and the supply members can be saved.

When dividing the inside of the filter,
It may be divided into two or more.
In particular, when the filter has a large filter space volume, the filter may be divided into three or more parts so that the clogging removal operation can be performed slightly.

The filter device having the above-described structure includes a granulating device for handling powder or granules, a coating device, a mixing device,
Not only can it be used in a fluidized bed apparatus such as a drying apparatus, but also can be applied to a vacuum cleaner, a cleaner, a dust collector, and the like that require a filter clogging removal operation in addition to the filter operation.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a filter and a filter device according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of an embodiment in which the present invention is applied to a granular material granulating apparatus. FIG.
(A) is a perspective view of a filter. (B) is sectional drawing which shows the internal structure of a filter. FIG. 3 is an exploded view showing a component configuration of the filter.

As shown in FIG. 1, the filter 12 is provided in the granulating cylinder 1 of a vertical fluidized bed apparatus. In the case shown in FIG. 1, the same reference numerals are used for portions having the same configuration as the fluidized bed apparatus shown in FIG. 7.

A substantially cylindrical granulating cylinder 1 is provided substantially upright, and the bottom side thereof is connected to a duct 3 via a porous plate 2. A cleaning filter 4 and a heat exchanger 5 are provided in the duct 3. The gas introduced into the duct 3 is purified by a cleaning filter 4, and the purified gas is heated or cooled by a heat exchanger 5 to a predetermined temperature. The gas at a predetermined temperature passes through the perforated plate 2 and enters the granulation cylinder 1 to fluidize the raw material powder.

A spray nozzle 6 is provided in the granulating cylinder 1 so that a binding liquid or a coating liquid can be sprayed into the granulating cylinder 1. The granules fluidized by the gas flow are granulated or coated by the sprayed binding liquid or coating liquid.

A filter 12 is provided above the spray nozzle 6 via a filter base 13. The filter pedestal 13 is formed in a substantially disk shape, and its peripheral portion is provided in contact with the inner surface of the granulation cylinder 1. As shown in FIG. 2, two substantially semi-circular openings 15a, 1
5b is provided.

The set screw 1 is located below the central partition 14.
The partition member 16 is fixedly attached at 4a. The partition member 16 is provided toward the lower side of the filter pedestal 13, and is a substantially rectangular plate that can divide the filter space in the cylindrical filter 12 attached to the filter pedestal 13 via the gasket 17 into two in the cylinder direction. It is formed in a shape. The partition member 16 may be formed, for example, on a stainless steel plate so as not to allow the gas used for fluidization to pass therethrough.

The filter 12 is formed in a substantially cylindrical shape with a filter material 12a, such as a filter cloth, formed into a pleated shape in order to increase the filtration area, and the both ends are sandwiched between a gasket 17 and an end cap 18. I have. The center of the end cab 18 is fixed to the lower end of the partition member 16 by a fixing screw 14b.
To stop the filter 12 on the filter base 13.
Can be detachably attached.

By mounting the filter 12 having the above structure on the filter pedestal 13, the internal space of the filter 12 is divided into two by a partition member 16 provided on the filter pedestal 13, and filter spaces A and B are formed. Above the two filter spaces A and B, pulse jet nozzles 10a and 10b for jetting pulse air are provided as gas jet nozzles.

Further, at the uppermost part of the granulating cylinder 1 provided with the filter 12 having the above-mentioned structure, an explosion pressure releasing cover 9 is provided for safety against explosion. When the inside of the granulation cylinder 1 is raised to an abnormal pressure due to the explosion, the explosion pressure diffusion lid 9 is naturally opened by the pressure, and the pressure in the granulation cylinder 1 can be returned to the normal pressure. I have.

The following describes a method of performing a filter operation for separating powder and granules from a gas using the fluidized bed apparatus having the above configuration and a fine powder removing operation for preventing clogging of the filter in parallel. I do.

The gas guided into the duct 3 is cleaned through a cleaning filter 4 provided in the duct 3, and the gas is set at a predetermined temperature through a heat exchanger 5. A gas set at a predetermined temperature is supplied into the granulation cylinder 1 through the perforated plate 2 to fluidize the powder.

The spraying or spraying of the binding liquid or the coating liquid from the spray nozzle 6 causes the granulation or coating of the granular material. Further, the gas used for fluidizing the granular material passes through the filter 12 and is discharged from the duct 8.

When gas passes through the filter 12,
The granular material is separated from the gas by the filter medium 12 a of the filter 12. If the separation operation by the filter 12 is continued as it is, the filter medium 12a is clogged by the fine powder of the granular material, and the filter efficiency of the fluidized bed apparatus is reduced. Therefore, in order to prevent the clogging which causes such a reduction in efficiency, fine powder is appropriately removed.

When removing the fine powder, as shown in FIG. 1, for example, pulse air is jetted into the filter space A from the spray nozzle 10a in the filter space A divided into two by the partition member 16. By the pulsed air, fine powder adhering to the side of the filter medium 12a constituting the filter space A is removed, and the clogging can be selectively removed only from the filter space A side of the filter 12.

On the other hand, the filter space B of the same filter 12
On the other hand, even if the fine powder removing operation by pulse air is performed in the filter space A, the filter operation may be continued by passing the gas used for fluidizing the granular material as before.

When the operation of removing the fine powder from the filter space A is completed, pulse air is blown into the filter space B from the spray nozzle 10b provided above the filter space B, and the fine powder is removed only by the filter space B. In the filter space A in which the fine powder removing operation has been completed, a filter operation for separating the powder and the granular material from the gas may be performed by passing the gas used for fluidization.

In this way, by using the filter 12 having the filter spaces A and B divided into two by the partition member 16, one of the filter spaces A and B can continue the filtering operation and the other can be used as the filter space. Can selectively remove fine powder for removing clogging. The efficiency of the filter operation can be improved and the fluidized bed can be stabilized as compared with the case where the filter operation is completely stopped and the fine powder removing operation is performed.

In the fluidized bed apparatus shown in FIG. 1, the spray nozzles 10a and 10b are arranged corresponding to the filter spaces A and B of the filter 12, respectively.
For example, the spray nozzle 10a is configured to be movable, and
Filter space A, B with only spray nozzles 10a
May be adapted to both.

Alternatively, a single spray nozzle 10a is provided in a fixed manner, and the filter 12 is set to, for example, a set screw 14a.
A movable type such as rotating around a central axis passing through a
The filter spaces A and B may be selectively moved below the spray nozzle 10a.

As shown in FIG. 3, the filter 12 described above is formed separately from the partition member 16 and the filter 12, and the filter 12 and the partition member 16 are combined to form the filter 12 inside the filter 12. Although one space is configured to be divided into filter spaces A and B, as shown in FIG. 4, a partition member 16 may be provided in the filter in advance, and the filter spaces A and B may be fixed and provided. .

In the case shown in FIG. 4, the filter material 12a formed in the form of a fold is formed in a cylindrical shape, stored in the outer tube 12b, and the partition member 16 is fixed and provided in advance in the filter material 12a. The spaces A and B are formed in a cartridge type filter 12 provided from the beginning.

The cartridge type filter 12 is
For example, it can be attached to a fluidized bed apparatus such as a flow coater 19 shown in FIG. A filter 1 is provided on the lower end 19b side of the two jet pipes 19a of the flow coater 19.
What is necessary is just to attach so that one end 12c side of 2 may be matched.

Further, as shown in FIG. 4, since the filter medium 12a is formed in the form of a fold, the filtering area can be increased as compared with the conventional configuration in which the filter medium 12a is not formed in the form of a fold.
The number of filters can be reduced. Although FIG. 5 shows a case where two cartridge type filters 12 are used, a case where one filter is sufficient may be considered in some cases.

As described above, by using the filter of the present invention, the number of filters can be reduced, such as by reducing the number of filters to one, without reducing the filter capacity of the fluidized bed apparatus. Since the number of filters is reduced, the time required for attachment / detachment related to filter replacement and the like, cleaning work and the like can be shortened, and labor can be reduced, and workability can be greatly improved.

In the above description, the case where the filter 12 is configured as a cartridge type has been described. However, as shown in FIG. 6, the filter 12 may be configured as a bag filter. In this case, a partition plate 21 may be provided inside the cylindrical retainer 20, and the interior of the retainer 20 may be divided into two filter spaces C and D.

At the upper end of each of the divided filter spaces C and D, a venturi tube 22 is provided. A bag filter is formed by covering the outside of the retainer 20 having such a configuration with a filter material 12a in a bag shape.

A pulse jet nozzle 23 is provided above the filter spaces C and D inside the retainer 20, for example, so that the position thereof can be changed. Alternatively, the pulse jet nozzle 23 may be moved to eject the pulse air. In the space where the pulsed air is not ejected, the filtering operation can be continued.

Alternatively, above the filter spaces C and D,
A pulse jet nozzle 23 may be provided for each, and pulse air may be selectively ejected.

The present invention is not limited to the above embodiment, and may be variously modified without departing from the gist thereof.

In the above description, the Venturi tube is not particularly provided in the case shown in FIG. 1, but may be provided with a Venturi tube.

In the above description, the nozzle for the pulse jet is configured to be movable, and of the divided filter spaces,
Although the configuration in which the pulse jet nozzle is moved above the filter space for removing fine powder has been described, the pulse jet nozzle is configured in a oscillating manner so that the jet direction of the pulse air is directed to the appropriately selected space. It may be.

In the above description, the case where the filter of the present invention is applied to a fluidized bed apparatus which treats powder or granular material by fluidizing with a gas has been described. The present invention can also be applied to filters such as dust devices, and filter devices.

In the above description, the case where the filter medium is formed in the form of folds so as to increase the filtration area has been mainly described.

Although the case where the filter space is divided into two by the partition member has been described, it may be divided into three or more. In particular, when the space inside the filter is large, 3
By dividing into a number more than the division, the clogging removal operation can be performed efficiently.

[0073]

According to the present invention, the clogging removing operation and the filtering operation can be performed in parallel with the same filter.

Therefore, for example, even when only one filter is provided, the clogging removing operation can be performed in parallel without stopping the filtering operation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of an embodiment of the present invention.

FIG. 2A is a perspective view of a filter, and FIG.
FIG. 4 is a cross-sectional view showing the inside of the filter of FIG.

FIG. 3 is an exploded view showing a component configuration of a filter.

FIG. 4A is a perspective view showing another configuration of the cartridge type filter, and FIG. 4B is a side view thereof.

FIG. 5A is a plan view of a flow coater,
(B) is a front view thereof. FIG. 5C is a side view showing a state in which the cartridge type filter shown in FIG. 4 is attached to a flow coater.

FIG. 6 is a sectional view showing a case where the configuration of the present invention is configured as a bag filter.

FIG. 7 is a sectional view showing a conventional configuration.

FIG. 8 is an explanatory diagram showing a procedure of a clogging removing operation when one filter is provided.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Granulation cylinder 2 Perforated plate 3 Duct 4 Filter 5 Heat exchanger 6 Spray nozzle 7 Filter 7a Bag filter 7b Bag filter 7c Bag filter 8 Duct 9 Explosion pressure release lid 10 Pulse jet nozzle 10a Pulse jet nozzle 10b Pulse jet nozzle DESCRIPTION OF SYMBOLS 11 Venturi tube 12 Filter 12a Filter material 12b Outer cylinder 12c One end 13 Filter pedestal 14 Center partition part 14a Set screw 14b Fixing screw 15a Filter space 15b Filter space 16 Partition member 17 Gasket 18 End cap 19 Flow coater 19a Jet pipe 19b Lower end 20 Retainer 21 Partition plate 22 Venturi tube 23 Pulse jet nozzle A, B, C, D Filter space

Claims (5)

[Claims] 1. A gas separation filter for separating a fine substance fluidized by a gas and the gas, wherein an internal space of the filter through which the gas passes is divided into a plurality of filter spaces. A filter operation for separating the gas and the fine substance is performed in all or any of the plurality of filter spaces, and the filter is clogged in another filter space where the filter operation is not performed. A filter, wherein a removal operation may be performed. 2. The filter according to claim 1, wherein the filter space is partitioned by the partition member that does not allow the gas to pass through. 3. The filter according to claim 1, wherein the filter is configured as a cartridge type filter or a bag filter. 4. The filter according to claim 1, wherein a gas is selected from among a plurality of filter spaces of the filter, and pulsed air is ejected into the selected filter space. An ejection nozzle, and in the filter space selected from among a plurality of filter spaces in the same filter, removes deposits on the filter by the pulse air in the selected filter space to perform a clogging removal operation. A filter device capable of performing a filter operation for separating the gas and the fine substance. 5. The filter device according to claim 4, wherein the filter device is provided in a fluidized bed device such as a granulating device, a coating device, a mixing device, and a drying device for handling powder or granular material. Filter device.