JPH0243535B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a granulation/coating device, which is characterized by the structure of a bag filter used in, for example, granulation and coating using a fluidized bed. It is something.

[Prior art]

For example, in a granulating apparatus that performs granulation using a fluidized bed, a bag filter is provided above the granulation tank to remove powder and granules that fly up with exhaust gas.

On the other hand, in a granulation tank, there is a risk of an explosion due to static electricity caused by friction between the flowing powder and granules in the tank, as well as high-temperature air flow and the filling organic solvent gas. In order to reduce the danger of explosions in this granulation tank, in order to reduce the risk of blast waves during explosions, granulation is carried out to guide the blast waves during explosions upwards where they are less dangerous. Some tanks have an explosion vent in the ceiling that can be easily opened by the blast wave in the event of an explosion.

However, as mentioned above, in the case of fluidized bed granulation,
It is necessary to place a bag filter at the top of the granulation tank. For this reason, even if an explosion dissipation port is provided at the top of the granulation layer, when an explosion occurs, it cannot be sufficiently effective due to the baggage filter.

Efforts have been made to eliminate this drawback, such as supporting the bag filter with a membrane that is easily torn, but none of them have been sufficiently effective.

The bag filter is also equipped with an air supply pipe (jet pipe), and by supplying high-pressure air to this and blowing the air out of the outlet, powder and granules adhering to the bag filter are dropped. I try to force myself to do so. Therefore, it was inconvenient to clean the bag filter, air supply pipe, and ventilate pipe. Furthermore, this air supply pipe also has the disadvantage of becoming a nuisance in the event of an explosion as described above.

[Structure of the invention]

In the granulation/coating device of the present invention, the bag filter provided in the upper part of the granulation tank is formed of a flat bag-like object, and these are arranged horizontally at regular intervals. The gap is constructed so that gaps are formed at regular intervals from the bottom to the top.

Furthermore, the granulation/coating apparatus of the present invention is configured such that the air supply pipe is disposed separately from the bag filter.

〔Example〕

Next, an embodiment of the granulation/coating apparatus of the present invention will be described in detail based on the drawings.

FIG. 1 is a sectional view of the granulation/coating apparatus of the present invention, and FIG. 2 is a sectional view taken along the line -- in FIG.
In these figures, 1 is a granulation tank, 2 is an aeration rotary plate having a large number of ventilation holes, 3 is a stirring blade, 4 is a rotating shaft that supports the aeration rotary plate 2 and the stirring blade 3, and 5 is a rotary shaft 4. 6 is a drive motor for rotating the rotary shaft 4 via a pulley or belt, thereby rotating the ventilation rotary plate 2 and stirring blades 3; 7 is a blower pipe; 8 is a raw material storage Supply pipe, 9
10 is a granule discharge port, and 10 is an explosion diffusion port covered with a thin film such as metal foil that can be easily torn when slightly strong pressure is applied. In addition to those shown in the figure, spray nozzles for coating, etc. are arranged, and granulation by rolling by rotating the ventilation rotary plate 2,
Stirring and granulation using the stirring blades 3, supplying air from the air pipe 7 with the ventilation rotating plate 2 stopped, and rotating the rotating plate 2.
This is a multifunctional structure that allows various operations such as granulation using a fluidized bed by blowing air through the ventilation holes, drying by supplying hot air from the blower pipe 7, and coating, all using the same device. The grain and coating equipment is illustrated. However, the structure of the part of the granulating device that performs granulation and coating is not limited to that of this embodiment, and may be any device that performs granulation using a general fluidized bed.

In FIGS. 1 and 2, reference numeral 11 denotes a bag filter, which has a plurality of bag filters arranged horizontally as shown in FIG. That is, as shown in FIG. 3, this bag filter 11 includes a support plate 12 having a rectangular shape and having ventilation holes 12a;
The frame body is made up of a substantially U-shaped support frame 13 attached to the support plate 12 and a large number of spring-like members 14 stretched between the support plate 12 and the support frame 13. It has a structure in which a thin bag-like object 15 is covered and fixed. A plurality of bag filters 11 having such a structure are arranged horizontally at regular intervals as shown in the upper part of the granulation tank 1. Reference numeral 18 denotes a ventilate tube attached near the ventilation hole 12a of the bag filter 11.

The bag filter 11 may be attached to the granulation tank by any means that can exhaust the air inside the granulation tank through the elastic holes 12a of the mounting plate 12 of the bag filter 11. In this embodiment, vertically elongated holes 1b are formed in the wall surface 1a of the granulation tank 1 at regular intervals by the number of bag filters 11 to be installed.
The bag filters 11 are inserted into the holes 1b from the direction shown in FIG. 3, respectively. After inserting all the bug filters 11 into the holes 1b, attach the mounting plate 12 located outside the wall surface 1a of the granulation tank 1 to the fixing plate 1.
6, and then screw the fixing plate 16 to the wall of the granulation tank 1. Incidentally, before inserting the bag filters 11 into the holes 1b, they may be fixed to the fixing plate 16 at regular intervals, and then the bag filters 11 may be inserted into the holes 1b as one body.

17 is an air supply pipe for cleaning the bag filter arranged in the exhaust tank 20; air outlet 1;
7a is installed so as to face the ventilation hole 12a of the mounting plate 12 of each bag filter 11. Therefore, this air supply pipe is installed separately from the bag filter 11 and the ventilate pipe 18. The high-pressure air thus sent to the air supply pipe is blown out from each outlet 17a and blown into the bag filter 11 through the vent hole 12a of the mounting plate 12 through the ventilator tube 18. By blowing air into the bag filter 11, the bag filter 1
This is to remove powder particles adhering to the outer surface of the bag-like object 15.

In the granulation/coating device of this embodiment, if air is sent from the blast pipe 7 with the rotation of the ventilation rotating plate 2 stopped, for example, the air will be blown up through the ventilation holes of the ventilation rotating plate 2. This allows granulation to occur in a fluidized bed. This ventilation rotating plate 2
The air that has passed through the ventilation hole rises inside the granulation tank 1, passes through the bag-like object 15 of the bag filter 11, enters the interior thereof, passes through the ventilation hole 12a of the mounting plate 12, and exits to the exhaust chamber 20 and exits to the exhaust pipe. 21. At this time, the powder and granules that have risen with the air flow are removed by the bag filter 11.

As described above, the bag filters 11 are installed horizontally at regular intervals and attached to the wall surface of the granulation tank 1. Therefore, there is a certain gap between each baggage filter, and from the bottom to the top,
In other words, voids continue to exist from the part where granulation is performed to the ceiling. Therefore, when an explosion occurs in the granulation layer, the blast wave etc. easily blows through the gaps between the bag filters and escapes to the outside of the tank through the explosion radiation hole 10, which is made of thin metal foil or other easily tearable structure. It will blow through.

In this case, since the air supply pipe 17 is arranged separately from the bag filter 11 and the ventilate pipe 18, it is not necessary to arrange the air supply pipe 17 in the exhaust chamber outside the granulation tank as in this embodiment. is also possible. Therefore, this air supply pipe 17
However, in the event of an explosion, the blast wave does not interfere with the blow-through, and it is easy to blow through to the outside of the tank, which is preferable for preventing accidents in the event of an explosion. Also, it is easy to clean the bag filter and air supply pipe.

In this embodiment, a thin membrane that is easily torn is used as the explosion diffusion hole, but the structure is not limited to this and may include a diffusion door or lid that can be easily opened.

In this embodiment, the granulation section (the section where granulation, coating, etc. are performed) of the granulation tank and the bag filter section in which the bag filter is installed are separable. That is, as shown in FIGS. 4 and 5, the granulating section 31 and the bag filter section 32
are housed in separate cases, and these are connected at parts 31a and 32a, respectively, and fixed with a tightening member 33 to maintain airtightness. It is something. The connection between the granulation section 31 and the bag filter section 32 may be sealed with a tube as shown in FIG. 6 to maintain airtightness when the connection is made.
That is, by arranging the tube 35 as shown in the figure at the connection part of the bag filter section 32 and blowing air into it, the tube 35 is closed as shown in FIG. 6B.
5 is inflated and sealed. When separating, remove the air and return to the state shown in Figure 6A. Further, the bag filter section 32 is rotatably attached to the exhaust chamber 20. That is, the bag filter section 32 is rotatably supported by the support member 22 with respect to the exhaust chamber 20. Therefore, if the tightening member 33 connecting the granulation section 31 and the bag filter section 32 is released and the bag filter section 32 is rotated in the direction of the arrow in FIG. As shown in FIG. 5, the bag filter section 32 is opened. Conversely, if the bag filter section 32 is rotated in the opposite direction to the arrow and tightened with the tightening member 33, the result shown in FIG.
The state shown in FIG. 2 is reached. At this time, the ventilation hole 12a of the mounting plate 12 of each baggage filter 11 attached laterally to the baggage filter section 32 is arranged so that the ventilation hole 12a of the mounting plate 12 faces the opening 23 of the exhaust chamber 20.
Air supply pipe 1 arranged near opening 23 of
The air outlet 17a of No. 7 has the air vent 12a.
will now face each other.

In this embodiment, the granulating section 31 and the bag filter section 32 are separable, so the inside of the granulating section 31 can be cleaned by rotating and opening the bag filter section 32. . In addition, with the bag filter section open, each part such as the stirring blade 3 and ventilation rotary plate 2 is removed to perform cleaning, repair, or replacement of the parts.

Furthermore, with the bag filter section 32 open, the bag filter 11 is pulled out from the bag filter attachment hole 1b of the granulation tank 1 to perform cleaning, repair, etc. of the bag filter.

〔Effect of the invention〕

In the granulation/coating device of the present invention, the bag filter is a flat bag-like object which is arranged horizontally at regular intervals.
There are gaps between each bag filter that extend from the bottom to the top and are spaced at regular intervals, which is extremely effective in preventing accidents in the event of an explosion.

In conventional granulation equipment in which the baggage filter is supported from above, the baggage filter in the granulation tank is high above the baggage filter, making the entire device large in size, but in the present invention, the baggage filter is supported in the horizontal direction. Therefore, the device is compact without making the bag filter higher. In addition, since it can be directly supported on the side wall of the granulation tank, there is no need to install a support frame inside the granulation tank and support the bag filter as in the conventional case, and the support structure is simplified. This makes installation and removal easier. In particular, if the granulation tank can be opened in parts as in the apparatus of the embodiment, it will be easier to attach and remove the bag filter, which will be extremely convenient for cleaning and repairing the bag filter. Furthermore, if the air supply pipe is separated from the baggage filter, it will be more effective in preventing accidents in the event of an explosion, and the baggage filter and air supply pipe can be easily installed and removed, making it easier to clean these parts. becomes even easier.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the granulation/coating device of the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 1,
Fig. 3 is an exploded perspective view of the bag filter mounting structure in the above embodiment, Figs. 4 and 5 are views showing the bag filter section of the granulation tank in the above embodiment in an open state, and Fig. 6 is a granulation tank in the above embodiment. It is a figure which shows an example of the means for sealing between the granulation part and bag filter part of a granulation tank. 1... Granulation tank, 2... Ventilation rotating plate, 3... Stirring blade, 10... Explosion diffusion hole, 11... Buzz filter, 12... Mounting plate, 12a... Ventilation hole, 1
5... Bag-shaped object, 17... Air supply pipe, 20...
...Exhaust chamber.

Claims (1)

[Claims] 1. A plurality of bag filters each consisting of a substantially flat bag-shaped object arranged in the upper bag filter part of the granulation tank and installed so that the ventilation holes thereof are located on the side wall surface of the granulation tank, and a granulation tank. and an air supply pipe in which an air outlet is arranged to face the ventilation hole of the baggage filter in an exhaust chamber arranged in a row, and each baggage filter is fixed so as to form an air in the vertical direction. A granulating/coating apparatus, characterized in that a bag filter is arranged at intervals and is detachably or movably disposed together with the bag filter section with respect to the exhaust chamber and the air supply pipe.