JPH0323302Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluidized granulation device equipped with a blow-off machine that blows off fine powder adhering to an inner peripheral wall.

[Prior art and its problems]

In the conventional fluidized granulation tank 1, the fluidized bed forming section 1
Cone part 1c located at the upper part of a, fine powder collection part 1
d is not particularly equipped with a device to remove fine powder adhering to its inner circumferential wall as shown in Fig. 7;
A hammer-type anti-stick device was provided.

In FIG. 7, F is a raw material powder supply port, A is a compressed air supply pipe that supplies compressed air to the binder supply pipe B, and 5 is a fluidized air blower 5, 6 that supplies air for forming a fluidized bed. There is a heater and 7 is an air receiver.

This means that in fluidized granulation, upper parts 1c and 1d
It was thought that the fine powder adhering to the granules did not particularly affect fluidized granulation, and it was used with intermittent hammering, etc., although it was unsatisfactory.

However, as a result of various experiments, the applicant has found that the fine powder adhering to the upper parts 1c and 1d also undergoes thermal denaturation due to the heat received, and that the composition of the granulated product is uneven, and that when a hammering device is used. Also, during hammering, a large amount of fine powder falls into the fluidized bed, causing an oxidized odor, and the particles become abnormally large, which significantly inhibits the fluidized granulation effect. Being there made a difference. Additionally, the hammering caused noise, which significantly worsened the working environment.

On the other hand, in the rolling granulation method, Japanese Patent Application Laid-Open No. 52-117292
A method is used to scrape off the powder adhering to the plate as shown in No.

However, if this scraping method is used in the fluidized granulation method, the following problems remain.

That is, in the rolling granulation method, mechanical force such as rolling or scraping is applied to the powder to compress the powder, causing the powder to aggregate and granulate. In this method, the product is dense, heavy, and spherical with a particle size of approximately 0.5 to 10 nm.

On the other hand, in the fluidized granulation method, the powder is aggregated and granulated by the moisture contained in the powder itself, so the granulated product has a low density, is soft, and has an irregular shape with a particle size of about 50 to 500 microns. Products produced by the fluidized granulation method are porous and therefore easily soluble in water, making them suitable for food and pharmaceutical products.

Therefore, if a scraping method is used in a fluidized granulation device similar to the rolling granulation method described above, the granulated product will remain attached to the wall in the form of a film.

Furthermore, in the fluidized granulation method, the fine powder is blown up by the fluidizing air, so that the fine powder adheres not only to the granulation part but also to the inner wall of the housing part of the bag filter for collecting the fine powder.

The above-mentioned scraping method cannot provide a mechanism for removing fine powder up to this housing portion.

Therefore, in the fluidized granulation method, the scraping method as described above cannot be used as is. Therefore, in the fluidized granulation method, it is necessary to use the intermittent hammering method as described above.

[Means for solving problems]

This invention solves the above problems by
c, 1d A rotary blow-off machine 3 that rotates along the inner circumferential wall and continuously blows off the attached fine powder is installed in a fluidized granulation tank 1 having a circular cross section or a similar shape. The rotating shaft 3a of this rotary blow-off machine 3 is adapted to the shape of the fluidized granulation tank 1, and its rotating shaft 3a passes through the center of the fluidized granulation part so as not to disturb the flow of the fluidized bed, and to prevent fine powder from falling. Since it is quantitative, the fluidized granulation effect is significantly improved compared to a granulation tank without a rotary blow-off machine 3. Furthermore, mechanically, no noise is generated.

[Effect]

Since the rotating shaft 3a of the rotary blow-off machine 3 passes through the center of the fluidized granulation section, a vortex flow with a negative pressure at the rotating shaft 3a is generated in the fluidized granulation section. Therefore, the fluid granulation action is performed around the rotating shaft 3a, and the rotating shaft 3a promotes the fluid granulation action without interfering with it.

[Description of Configuration] First, the batch type granulation apparatus having the first configuration shown in FIGS. 1 to 3 will be described.

1: A batch-type fluidized tank that forms a fluidized bed in a lower fluidized bed forming section 1a, in which warm air is blown from the bottom plate 1b to fluidize the raw powder placed on the bottom plate 1b.
1c is a cone portion.

2: Binder spray nozzle 3: Rotates around a rotating shaft 3a with a rotary blow-off machine, and blows out cleaning air from a blow-off hole 3c of a blow-off portion 3b facing the inner circumferential wall of the fluidized granulation tank 1.

4: Collect fine powder in the air sucked by the exhaust fan 8 using a filter bag.

5: A blower for forming the fluidized bed forming section 1a, in which air is heated by the heater 6 and ejected from the bottom plate 1b.

6: Heater as described above; 7: Air receiver at the bottom of the fluidized bed bottom plate 1b.

8: Exhaust fan that sucks air from the filter bag 4; 9: A blower that supplies cleaning air; 10: Raw material that protrudes from the fluidized bed forming part 1a of the rotating shaft 3a of the rotary blow-off machine 3 and adheres to its inner peripheral wall. This is a fluidized bed blowing machine that blows off powder. Therefore, it rotates together with the rotary blow-off machine 3.

11: This is an example of a seal portion of a through hole penetrating the bottom plate 1b of the rotary shaft 3a of the rotary blow-off machine 3. The rotary shaft 3a rotates in an air-sealed state by flowing air.

The effect will be explained below.

On the bottom plate 1b of the fluidized granulation tank 1, the raw material powder is fluidized by the air jetted from the air receiver 7, and a fluidized bed is formed.

A part of the fine powder rises within the fluidized granulation tank 1 from the fluidized bed forming section 1a and adheres to the inner circumferential wall thereof.

In the granulating device of the present invention, the air receiver 7 and the fluidized bed forming section 1a are connected to a rotary shaft 3 which is air-sealed.
The upper air blowing part 3b of the rotary blow-off machine 3 rotates along the inner circumferential wall of the fluidized granulation tank 1 around point a.

Then, the blowing air blown out from the air blowing hole 3c blows off the fine powder adhering to the inner circumferential wall of the fluidized granulation tank 1, and causes it to rise toward the filter bag 4 or fall toward the fluidized bed.

In addition, a fluidized bed blow-off machine 10 is similarly provided in the fluidized bed forming part 1a and protrudes from the rotating shaft 3a.
Blow off the fine powder adhering to the inner peripheral wall of a. However, the amount of cleaning air blown should be such that the flow of the fluidized bed is not disturbed. In addition, in the case of the batch type, fine powder adhering to the inner peripheral wall can be blown up to further increase the hardening of the granulation.

(Description of the second configuration) Next, a case where the device of the present invention is used in the continuous granulation device shown in FIGS. 5 and 6 will be described.

In the second configuration, the drawing numbers are 1 to 9.
, the names of the members are the same, but the fluidized bed part blow-off machine 10 in the first configuration does not exist, and instead, a stirrer 12 is provided in the fluidized bed forming part 1a, and the stirring blades 12a are It is rotated around the stirrer shaft 12b. This stirrer shaft 12b is moved by motor m2.

This stirring shaft 12 is the rotating shaft 3a of the rotary blow-off machine 3.
It is established by enclosing the

Further, the raw material powder is supplied from the raw material supply port F and taken out from the product take-out port 13.

Also, as shown in Fig. 6, the rotating shaft 3a of the rotary blow-off machine
and the agitator shaft 12b are air sealed by 14, and between the agitator shaft 12b and the bottom plate 1b by 14.
Air sealed by 5.

The operation of the second configuration will be explained below.

In FIG. 5, since the stirring blade 12a is attached to the fluidized bed forming section 1a, even if a humid fluidized bed is formed by continuously supplied raw material powder and continuous binder spray, it will not work normally. A fluidized bed is formed. In the case of the batch type, the binder is not continuously supplied, and drying and granulation are repeated, so that a fluidized bed can be formed relatively normally even without a stirrer.

Moreover, since the agitator shaft 12b, the bottom plate 1b, and the rotating shaft 3a are sealed by the seal mechanisms 14 and 15, the flow of the fluidized bed is not disturbed.

〔Example〕

Example 1 A batch machine with a height of 2.0 m and a maximum diameter of 1.0 m that forms 30 kg of average particles at a time and granulates 50 μm powder into 150 μm particles.If a conventional hammer blowing device is used, the device will adhere to the device heavily. Clumps (large 2-6mm lumps)
and an oxidized odor was generated.

A porous pipe with a blowout hole diameter of 3 mm and a pitch of 30 mm is installed on this, and the air volume is 6 m ³ /min and the pressure is 3000 mm Ag or
As a result of blowing with H ₂ O and rotating the wall surface at a rate of 3 times/min, a good granulated powder was obtained with no adhesion to the equipment, no lumps, and no oxidized odor.

Example 2 Height: 4.5 m, maximum diameter: 2.5 m. Hot air and primary liquid raw material are sprayed at the top, and hot air for granulation layer fluidization is introduced from the bottom of the granulation binder spray device at the middle part, and the granulated powder is continuously sprayed. The slit width is 1.0mm,
A 2mm slit pipe with a 150mm pitch at the slit stopping part was installed, and a device was installed that blows air at an air volume of 8m ³ /min and a pressure of 2500mmAg, rotating the wall surface twice per minute, and a stirring device that rotates around it. As a result, 250Kg/as a granulated powder with an average particle size of 150μm
A product of H could be obtained.

[Effect of idea]

(a) Cone section 1c at the top of the fluidized bed, fine powder recovery section 1d
Since the fine powder adhering to the surface is blown off, it eliminates the thermal denaturation of the adhering fine powder and the imbalance of the composition, which was the case in the past, and also solved the noise problem.

(b) In order to prevent the shape of the rotary blow-off machine 3 from disturbing the flow of the fluidized bed, the central part of the fluidized bed is attached to the rotating shaft 3a.
Since it is designed so that it penetrates, the fluidized granulation effect is not inhibited.

This is because when the rotating shaft 3a rotates, the fluidized bed forming section 1a generates negative pressure at the rotating shaft 3a, and the granulation action continues around the rotating shaft 3a. Therefore, the presence of the rotating shaft 3a and its rotation do not impede the granulation action at all.

(c) By using a rotary blow-off machine in the fluidized granulation method, the fine powder adhering to the inner wall of the tank is thermally denatured and falls along the inner wall without becoming attached, or it rises toward the filter bag 4. can. This is because the granulated product produced by the fluidized granulation method has a low density, is soft, has an irregular shape of about 50 to 500 microns, and is porous, so the fine powder used to form it is also a fine powder with similar properties.

Therefore, it can be sufficiently removed from the wall using an air blower.

In other words, the key point of the present invention is that an air blower system that does not interfere with fluidized granulation is selected for the fluidized granulation device.

[Brief explanation of the drawing]

(First embodiment) Fig. 1: Cross-sectional view of the device of the present invention, Fig. 2: Fig. 1 - sectional view, Fig. 3: Fig. 2 - sectional view, Fig. 4: An example of the air seal part. Cross-sectional view, (Second embodiment) Figure 5: Cross-sectional view of the second embodiment, Figure 6: Perspective view of the fluidized bed portion, (Conventional example) Figure 7: Cross-sectional view of the conventional device, 3 Figure 1...Fluidized granulation tank, 1a...Fluidized bed forming section, 1
b...Bottom plate, 1c...Cone part, 1d...Fine powder collection part, 2...Binder spray nozzle, 3...Rotary blow-off machine, 3a...Rotary shaft, 3b...Blow-off part,
3c... Air blowing hole, 4... Filter bag, 5... Fluid air blower, 6... Heater,
7...Air receiver, 8...Exhaust fan, 9...
Blower for cleaning air, 10...Fluidized bed blow-off machine,
11... Air seal part Figures 5-6 12... Stirrer, 12a... Stirring blade, 12b...
...Stirring rotation shaft, 13...Product outlet, m1...
Drive motor of rotary blow-off machine 3, m2... Drive motor of stirring rotating shaft 12b Fig. 7 F... Raw material powder supply port, A... Compressed air supply pipe, B... Binder supply pipe, P... Granulation Product outlet, N... Hammering device.

Claims (1)

[Claims for Utility Model Registration] In a granulating device in which a binder liquid is sprayed from the middle part of a fluidized granulation tank 1 having a circular cross section or a similar shape, and hot air is spouted from a bottom plate 1b to form a fluidized bed, After the rotating shaft 3a passes through the central part of the fluidized bed granulation part in an air-sealed state, it extends beyond the upper part of the fluidized bed to reach the inner circumferential wall of the fluidized granulation tank 1, and further rotates along the inner circumferential wall. A fluidized granulation device characterized in that it is equipped with a rotary blow-off machine 3 to blow off fine powder adhering to an inner peripheral wall. Utility model registration claim 1 comprising a rotary blow-off machine 3 having a fluidized bed part blow-off machine 10 protruding from the rotating shaft 3a of the fluidized bed part that reaches the inner circumferential wall of the granulation tank 1
Fluidized granulation device as described in section. A fluidized granulation device according to claim 1, which is equipped with an agitator 12 for agitating a fluidized bed portion.