JP2004141702A - Fluidized bed granulation and drying apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluidized bed granulation and drying apparatus constituted so as to have a structure reducing a dead angle and simplifying the attachment and detachment of a bag filter. <P>SOLUTION: Bag filters are respectively arranged in a plurality of bag filter chambers so as to partition an upper case by a partition wall, and a tube seal for covering the bag filters as a whole is arranged between a frame covering the bag filters as a whole and the upper case. The space between the upper case and the frame is held to an airtight state by sending compressed air into the tube seal. A plurality of the bag filters are made liftable and lowerable at the same time along with the frame by one lift device. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fluidized-bed granulating and drying apparatus comprising: a lower case connected to an intake device and having a ventilation plate to form a fluidized bed; and a lower case connected to an exhaust device and having a bag filter. It is about.
[0002]
[Prior art]
As is well known, a fluidized bed granulating and drying apparatus feeds air into a lower case connected to an air suction device, and fluidizes powder, for example, into a fixed perforated plate or a rotary perforated plate by the air. To form a fluidized bed and perform granulation. In addition, a bag filter is disposed in the upper case, and further connected to an exhaust device. Then, the powder and the gas are separated by the bag filter, and the gas is sent out of the granulation drying device by the exhaust device.
[0003]
In such a fluidized-bed granulating and drying apparatus, an apparatus in which a bag filter for separating a powder and an air flow can be operated without stopping fluidization of the powder is known (Patent Document 1). reference).
[Patent Document 1] As is well known in Japanese Patent Publication No. 1-25322, a fluidized bed granulating and drying apparatus performs granulation by fluidizing powder by an air current.
[0004]
In this apparatus, in order to promote mixing of the powders and to promote and adjust the reaction between the gas and the powders, it is preferable that there is no drift of the gas flow.
[0005]
In addition, if the gas flow is stopped before the desired mixing or reaction of the powder is completed, the mixing or the reaction becomes uneven, and the bag filter that separates the powder and the air flow stops the fluidization of the powder. It is desirable to be operated without any problems.
[0006]
Therefore, conventionally, as in the apparatus described in the above-mentioned document 1, a fluidized-bed granulating and drying apparatus has a bag filter arranged in each chamber partitioned by a partition wall which divides a container into a plurality of containers. In this configuration, a mechanism for removing powder from the chamber is provided for each chamber partitioned by a partition.
[0007]
A conventional fluidized bed granulating and drying apparatus having such a configuration is, for example, as shown in FIGS.
[0008]
FIGS. 6 and 7 show a configuration of an upper case portion in which an upper bag filter and the like are arranged in a conventional fluidized bed granulation and drying apparatus. Among these figures, FIG. 6 is a diagram showing the configuration of the upper case portion, and FIG. 7 is a diagram showing a state where the bag filter is lowered.
[0009]
FIG. 6A is a cross-sectional view of the upper case, and FIG. 6B is a diagram illustrating the configuration of the entire upper case. In these figures, 21 is an upper case, 22 is a partition partitioning the upper case to form a plurality of bag filter chambers 23, 24 is a bag filter arranged in the bag filter chamber 23, 25 is a bag filter frame, 26 is a tube seal, Reference numeral 27 denotes a removing device, reference numeral 28 denotes a bag filter support portion, reference numeral 29 denotes a cylinder, reference numeral 30 denotes an elevating device, and reference numeral 31 denotes an elevating wire cable. Here, the tube seal 26 is for maintaining the airtightness of the upper and lower portions of the bag filter, and is made of rubber. The inner portion of the bag filter chamber 23 (the inner surface of the upper case 21 and the inner surface of the partition wall 22) is inflated by sending compressed air therein. ). Therefore, it is necessary to increase the radius of curvature of the surface where the inner wall of the bag filter chamber 23 contacts the tube seal 26. A blind spot space 34 is formed between the outside of the surface 33 where the radius of curvature needs to be large and the inside of the bag filter chamber 23, and this space 34 is formed from the lower end to the upper end of the partition wall 22 of the bag filter chamber 23. The blind spot space 34 is extremely large. In addition, 35 is a connection part to a discharge device.
[0010]
In the apparatus shown in FIG. 6, for example, if the diameter of the bag filter chamber is 800 mm and the filtration area of the bag filter is 30,000 cm ² , the diameter of one bag filter 23 is 120 mm, and the distance between the bag filters is Is kept constant. In this case, one of the effective opening areas partitioned by the partition wall of the bag filter frame is 1530 cm ² , is 750 mm in height, and has five bag filters. The horizontal cross-sectional area of the five bag filters affecting the filtration rate is 565 cm ² .
[0011]
Further, a plurality of bag filters 24 are arranged in a bag filter chamber 23 partitioned by a partition wall 22 for dividing the upper case 21 into a plurality of parts, and also maintain airtightness with a frame 25 in which the bag filter 24 is mounted. , It is necessary to provide a mechanism for attaching and detaching the bag filter 24 and the frame 25 and the like for each of the bag filter chambers 23 partitioned by the partition wall 22, so that the structure is complicated. Work is inconvenient.
[0012]
Further, in this conventional example, lifting devices 30 are provided on the left and right of FIG. That is, a lifting device 30 is provided for each of the right and left bag filter chambers 23 partitioned by the partition wall 22 in FIG. 6, and the lifting and lowering of the bag filter 24 is separately performed by the lifting wire cables 31 of the lifting devices 30.
[0013]
In the conventional removing device 27, the powder adhering to the bag filter 24 is removed by the air cylinder 29.
[0014]
FIG. 7 shows a state in which the bag filter 24 is lowered by operating the elevating device 30 in the conventional fluidized-bed granulating and drying apparatus shown in FIG.
[0015]
As shown in FIG. 7, the bag filter 24 is lowered to remove or attach the bag filter.
[0016]
As shown in the figure, the conventional granulating and drying apparatus requires the bag filters 24 to be separately lowered and removed for each bag filter chamber, and similarly to be separately raised and installed at a predetermined position. However, there are drawbacks such as a long working time.
[0017]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention provides a fluidized bed granulating and drying apparatus having a small blind spot and a simple structure for mounting and removing a bag filter.
[0018]
[Means for Solving the Problems]
The fluidized bed granulating and drying apparatus of the present invention is connected to an intake device and includes a lower case that includes a rotary perforated plate or a fixed perforated plate to form a fluidized bed, and is connected to an exhaust device and includes a partition. An upper case having a plurality of partitioned bag filter chambers and a bag filter arranged in the bag filter chamber, and a frame covering the bag filter as a whole, wherein all the bag filters are provided between the frame and the upper case. A covering tube seal is provided, and airtightness is maintained by sending compressed air into the tube seal.
[0019]
Thereby, the fluidized bed granulating and drying apparatus of the present invention can reduce the drift of the airflow with a small blind spot.
[0020]
Further, the fluidized bed granulating and drying apparatus of the present invention is characterized in that it comprises an elevating device for vertically moving all the bag filters as a whole.
[0021]
Accordingly, all the bag filters can be moved up and down integrally, so that the structure is simple and the removal of the bag filters for washing or the like becomes easy.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a fluidized bed granulation and drying apparatus of the present invention will be described with reference to the drawings.
[0023]
1 and 2 are views showing the overall configuration of a fluidized bed granulation and drying apparatus of the present invention, and FIG. 2 is a view of FIG. 1 viewed from the right side. FIG. 3 is a sectional view of an upper case in which the above-mentioned bag filter of the fluidized-bed granulating and drying apparatus of the present invention is disposed.
[0024]
In FIG. 1, reference numeral 1 denotes an apparatus of the present invention, 2 denotes a lower case of a fluidized bed provided with a fixed or rotating ventilation plate or the like, 3 denotes a connection pipe connected to an intake device in the lower case, and 5 denotes an expansion chamber. 10 is an upper case, 11 is a partition, 12 is a bag filter chamber formed by the upper case 10 and the partition 11, 13 is a bag filter arranged in the bag filter chamber 12, 14 is a bag filter frame, Reference numeral 15 denotes a tube seal, 16 denotes a removing device, 16a denotes a support portion, 16b denotes an air cylinder, 17 denotes a lifting device, and 18 denotes a lifting wire cable. Reference numeral 19 denotes a connection pipe connected to the exhaust device.
[0025]
FIG. 4 is an enlarged view of a portion where the bag filter is arranged in the apparatus of the present invention. 4, (A) is a diagram showing a configuration of a bag filter portion, (B) is a diagram showing a configuration of an upper case, and (C) and (D) are (A) and (B) viewed from the lateral direction, respectively. Only a part is shown in the drawing.
[0026]
As shown in FIG. 4, a tube seal 15 is arranged between the ring-shaped bag filter frame 14 and the lower part of the bag filter chamber 12 irrespective of the partition 11. Thereby, the airtightness of the upper and lower portions of the bag filter 13 is increased by injecting compressed air into the rubber tube seal 15 so that the tube seal 15 is inflated to expand the inner wall of the bag filter chamber 12 (the inner surface of the upper case 10 and the partition 11). Surface).
[0027]
With the above-described configuration, the fluidized bed granulating and drying apparatus of the present invention provides a blind spot space 21 formed from the lower end to the upper end of the partition 11 of the bag filter chamber 12 so that the bag filter chamber 12 and the partition 11 are separated. It can be said that there is no blind spot even if only the crossing portion is taken into consideration for cleaning.
[0028]
For example, in the fluidized bed granulating and drying apparatus of the present invention, when the diameter of the bag filter chamber 12 is 800 mm and the filtration area of the bag filter is 30,000 cm ² , the diameter per bag filter is 120 mm. Assuming that the distance between the bag filters is kept constant, the effective opening area of one of the bag filter frames divided by the partition walls 11 is 1930 cm ² , and the bag filter frame is provided with seven bag filters 13 having a height of 500 mm. Therefore, the horizontal cross-sectional area of the seven bag filters that affect the filtration rate is 791 cm ² .
[0029]
As described above, the fluidized bed granulating and drying apparatus of the present invention has a larger effective opening area and the like than the conventional fluidized bed granulating and drying apparatus shown in FIGS. The amount of rising powder is small, and the pressure loss of the bag filter is small. Also, the updraft does not cause drift.
[0030]
FIG. 5 shows a state in which the bag filter arranged in the upper case of the fluidized bed granulating and drying apparatus according to the embodiment of the present invention has been lowered. In FIG. 5, (A) shows a portion such as a bag filter chamber, and (B) shows an elevating device.
[0031]
In the fluidized bed granulating and drying apparatus of the present invention, as shown in FIG. 5, each of the bag filter chambers 12 partitioned by the partition walls 11 is provided with a lifting wire cable 18a, 18b,. The elevating wire cable 18 is configured by being united at the upper part, and is attached to the elevating device 17.
[0032]
Thereby, when the lifting device 17 is operated, the wires 18a, 18b,... Which are put together can be extended simultaneously, and all of the plurality of bag filters can be integrally lowered.
[0033]
Therefore, it is easy to disassemble and assemble the bag filter when cleaning it.
[0034]
【The invention's effect】
INDUSTRIAL APPLICABILITY The fluidized bed granulating and drying apparatus of the present invention has almost no blind spot space in the bag filter chamber, and thus can effectively utilize all the space in the bag filter chamber. Further, since there is no blind spot space, there is no drift in the upward airflow, and since the horizontal cross-sectional area of the bag filter is large, the filtration speed is low. As a result, the amount of rising powder is small and the pressure loss of the bag filter is small. Further, the height of the bag filter is as low as 750 mm to 500 mm, and the height of the device can be reduced. Further, it is possible to operate a plurality of bag filters integrally, the operation is simple, the disassembly and the assembly are easy, and the production cost can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a view showing the configuration of a fluidized bed granulation and drying apparatus of the present invention. FIG. 2 is a view of the apparatus shown in FIG. 1 as viewed from the lateral direction. FIG. FIG. 4 is a view showing a configuration of an upper case of the apparatus shown in FIG. 1; FIG. 5 is a view showing a state in which a bag filter of the apparatus shown in FIG. 1 is lowered; FIG. FIG. 7 is a view showing a configuration of an upper case of the apparatus. FIG. 7 is a view showing a state in which a bag filter of the apparatus shown in FIG. 6 is lowered.
DESCRIPTION OF SYMBOLS 1 Granulation drying device 2 Lower case 3 Connection pipe 10 connected to an intake device 10 Upper case 11 Partition wall 12 Bag filter chamber 13 Bag filter 14 Bag filter frame 15 Tube seal 16 Removing device 17 Elevating device 18 Elevating wire cable 19 For exhaust device Connection pipe to connect

Claims (2)

The lower case is connected to the intake device and forms a fluidized bed having a ventilation plate inside, and the upper case is connected to the exhaust device and has a bag filter that separates powder and airflow of the internal fluidized bed. A bag filter chamber divided by a partition that divides the upper case into a plurality of devices, and a frame that covers all the bag filter chambers as a whole, between the frame and the upper case. A fluidized bed granulating and drying apparatus characterized in that the apparatus has a tube seal covering all the bag filters, and keeps airtight by sending compressed air to the tube seal. The fluidized-bed granulating and drying apparatus according to claim 1, further comprising an elevating device that simultaneously moves up and down each bag filter in each of the bag filter chambers.

Images