JPH0225654B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a method for mixing, drying, granulating, pelletizing, coating and/or crushing materials.
a tank having a substantially rotationally symmetrical shape, for example a conical shape, about at least a substantially vertical axis and connected to a gas supply for moving, in particular flowing, the material therein; and a tank arranged above the tank and having a circular ridge; The present invention relates to a fluidized bed apparatus having a vaulted ceiling with a rectifying plate that turns upward gas accompanied by material outward and downward, and a gas outlet pipe disposed above the rectifying plate.

(Prior Art) In a known fluidized bed device of this type (European Patent Publication No. 103900), the gap between the baffle plate and the gas outlet pipe arranged above the baffle plate is only partially utilized. Not yet. That is, a descending pipe is provided in the center of this gap, and this descending pipe extends from above through the baffle plate to the lower region of the tank.
Just pump in fresh gas.

(Problem to be solved by the invention) However, even if the outer diameter of the descending pipe is large, the area around the outer wall above the current plate is abandoned as an unused area, and in this area, the gas outlet pipe The gas flows at a very low velocity towards the
It tends to accumulate inward in the radial direction of the annular ridgeline on the upper surface of the current plate.

It is therefore an object of the present invention to obtain a fluidized bed apparatus in which such deposits can be avoided.

(Means for Solving the Problems) In order to achieve this object, the fluidized bed apparatus of the present invention has an annular filter disposed coaxially with the current plate and in close contact with the current plate, and radially outward of the filter. The present invention is characterized in that the current plate is formed in such a size that gas flows upward through the current plate only in the first direction, and a gas outflow pipe is connected to the inner space of the filter.

(Effect) According to this configuration, a small unused area above the current plate is also utilized, and the gas passes through the radially outer edge of the current plate or passes through the gas permeable edge area provided in advance on the current plate. The gas flowing upward is filtered out. Accumulation of dust and material particles in the radially inner region of the upper surface of the baffle plate is thus avoided. Since the flow velocity is higher in the radial direction outward of the ridgeline on the upper surface of the current plate, no significant accumulation occurs.
Furthermore, by providing the filter entirely or at least partially within the tank, the need for external filters is eliminated, resulting in an overall space-saving arrangement.

In a preferred embodiment of the invention, the baffle plate has a ridgeline, and the diameter of the bottom of the filter corresponds at least approximately to the diameter of the ridgeline of the baffle plate.

In order to close the filter, it is preferable to fix the filter between the current plate and the annular joint of the tank head mounting member.

Further, in a preferred embodiment of the invention, the filter has a bottom ring that flares radially outwardly from the upper constricted end and carries a seal on its underside.

Furthermore, in a preferred embodiment of the present invention, the filter that is in close contact with the current plate is surrounded by an annular outer filter on the outside as an inner filter, and the inner filter has a bottom ring that is closely arranged on the current plate. Both filters form a common annular ridgeline above, and the outer filter has a bottom ring that is closely disposed on the tank.

According to this configuration, the filter can be accommodated in the existing internal space, and even a filter with a large area can be accommodated.

In this case, both filters may be configured as self-retaining filters, which are held elastically only by the installation of the bottom ring on the baffle plate or the tank. This configuration makes the installation of the filter particularly simple.

Furthermore, in a preferred embodiment of the present invention, the inner filter similarly expands downward in a frusto-conical shape, and the bottom ring rests on the radially outer region of the annular ridgeline of the baffle plate. composition.

(Example) Next, an example of the present invention will be described with reference to the drawings.
The fluidized bed apparatus shown in FIG. 1 has a tank 10 which is rotationally symmetrical about a vertical axis A and is approximately spherical in the illustrated embodiment. The tank 10 is comprised of an upper part 12 and a lower part 14, both of which are made of glass and which are releasably closely connected to each other in the horizontal equatorial plane B--B of the sphere. The lower part 14 rests on a rotationally symmetrical support 16 . An annular path 18 is formed in this support portion 16, and this path is connected to the interior of the tank 10 by a continuous annular gap 20. Circular path 18
A conduit 22 is introduced tangentially into a portion of the gas supply, which conduit 22 is connected to a gas supply source.

Below the annular cavity 20, a plurality of nozzles 24 for liquid are arranged equidistantly spaced around the axis A, and an orifice for solid material is arranged at a short distance below the position of these nozzles. Place 26. The orifice 26 is connected to an annular chamber 28 into which a conduit 30 for solid material in powder form is tangentially introduced.

A pot-shaped portion 32 is connected to the support portion 16 inwardly in the radial direction below this orifice 26, and the pot-shaped portion 32
An annular chamber 28 is formed by fitting an outer wall 34 around a generally cylindrical wall 33 of the housing. Although the annular chamber 28 is only shown in the left half of FIG.
The outer wall 34 is the outer wall 3 as shown in the right half of FIG.
4' can also be used instead and brought into direct contact with the cylindrical wall 33 of the bowl-shaped part 32. In either case, the outer wall 34 or 34' is pushed up onto the bowl 32 from below and supported by a support ring 36, which is also mounted on the bowl 32 from below and fixed with screws.

The pot-shaped portion 32 is provided with a tubular connecting portion 38 that projects downward in the axial direction, and the connecting portion 38 is supported by a support tube 40 connected to a support arm 42 . This connecting part 3
A turning body 44 having a rotationally symmetrical shape is arranged at the center of the space 8, and the left side of FIG. A discharge state is shown when no gas is supplied, and in this discharge state the tank 10 can be emptied. A piston-cylinder arrangement 46 is arranged inside the connection for the movement of the deflecting body 44 between the positions which produce the two above-mentioned states.

The turning body 44 has a central portion 48 with a pointed tip;
This central portion projects upward in the axial direction at the lower end of the descending pipe 50 disposed in the axial direction. Descending tube 50
It is supported by a support 52 provided at the lower end of the pot-shaped portion 32, and a cylindrical wall of the pot-shaped portion forms an annular space 54 extending narrowly and narrowly.

A rectifying plate 58 is arranged around the upper end of the descending pipe 50 to which the gas inflow pipe 56 is connected.
8 is formed from a smooth thin plate to form an annular vault having a semicircular cross section. This dome has a circular ridgeline C, and the diameter of this ridgeline C is approximately half the inner diameter of the tank 10. The entire center of curvature of the cross-sectional shape of the dome draws a circle E, and this circle E is located on the equatorial plane of the tank 10, which is approximately spherical. The current plate 58 is closely connected to the upper end of the descending pipe 50 so that an annular gap 60 is formed between the current plate and the tank 10, and the cross-sectional shape of this gap 60 is smaller than the cross-sectional shape of the annular space 54. is also quite large.

A cylindrical filter 62 with a circular cross section is placed on the current plate 58 by means of a bottom ring 64 . This bottom ring 64 expands outward in a conical shape from the upper reduced top surface, and a ring-shaped seal 66 embedded in the bottom surface of the bottom ring covers the area of the ridge line C of the current plate 58. blockade.

Above the filter 62 is a wide ring-shaped seal 6
8 closes off a ring-shaped support surface 70, which is provided on a head mounting member 72 above the tank. The head mounting member 72 is provided with a gas outlet pipe 74 which can be connected by conventional means (not shown) to a device for purifying the escaped gas again.

The fluidized bed apparatus shown in FIG. 1 is started by introducing heated air through a descending pipe 50 into a tank 10 which is empty at the beginning of operation. This heated air is diverted by the turning body 44 which assumes the lowered position in the operating state, passes vertically upwards around the descending pipe 50 through the annular space 54, is deflected outwardly and downwardly by the current plate 58, and is deflected by the current plate 58. A toroidal spiral is produced in the lower region. This vortex is maintained by additional air, which is introduced into the interior of the tank 10 through the annular gap 20, with the introduced air flowing downwardly and inwardly.

A liquid or liquid mixture is introduced into the additional air flowing through the air gap 20 through a nozzle 24 for the liquid.
Further, a powdered solid or a powder mixture is injected through a powder nozzle 26 . A particulate composition is generated inside the air swirl, and this particulate composition moves upwardly on the rising airflow around the descending tube 50, and is moved radially outward and then downward by the baffle plate 58. convert to. The additional air flowing in through the annular gap 20 constitutes an air cushion, by means of which the particulate composition or other material to be processed by the tank 10 that falls uniformly downwards is returned again above the annular space 54. It begins to move upward in the axial direction. The used air flows upwardly through the annular gap 60, is filtered by the filter 62, and is discharged through the gas outlet pipe 74.

The fluidized bed apparatus described above can also be used for other applications. For example, the nucleating material or the treated particulate material can be introduced into the tank 10 in which it can be lacquered or ground.

FIG. 2 shows a second embodiment of the present invention, which differs from the embodiment shown in FIG.
The bowl-shaped portion 32, the descending pipe 50, and the gas inflow pipe 56 are omitted, and two annular voids 7 are provided as gas inflow ports in the radial direction inward of the annular void 20 in the support portion 16.
6, 78 are provided to directly connect the turning body 44 to the support 16.

The annular cavities 20 and 76 on the one hand, and the annular cavities 76 and 78 on the other hand, are separated from each other by an annular partition 80 or 82 provided in the support 16, which partitions 80, 82 within the annular channel 18. It is supported by struts 84 or 86. void 2
0.76 opens directly into the tank 10. void 78
is connected to an annular turning path 88, and this turning path 8
8 is formed between the turning body 44 and the side surface 90 of the partition made of a thin plate of special steel. The side surface 90 is fixed by bolts 92 parallel to the axis, and these bolts 92 are inserted into the turning body 44 from above.

The nozzle support 94 is inserted from below into the axial hole formed in the turning body 44, and the nozzle support 94
4 protrudes upwardly from the turning body 44 radially inwardly of the opening of the annular turning path 88 and is provided with an annular array of nozzles 24 for injecting liquid material. In the annular channel 18 of the support 16 a conduit 22 connected to a gas source opens, as in the embodiment shown in FIG. 1, and in contrast to the embodiment shown in FIG. 30 is also opened.

The current plate 58 has a shield 96 at its center, and this shield 96 is fixed by tie rods 98. This tie rod 98 tightens the current plate 58 and the filter 62 to the head mounting member 72 in a detachable manner.

A third embodiment is shown in FIG. 3, in which the filter 62 has a bottom ring 64 that is larger in diameter than that shown in FIGS.
The bottom ring 64 shown in FIG. 3 is placed on the current plate 58 radially outward of the annular ridge line C of the current plate 58. As shown in FIG. Outside the ridgeline of the current plate, the slope becomes steeper toward the outside, so powder or granules of material do not accumulate on the current plate 58. The filter 62 tapers conically upwardly from the bottom ring 64 to an annular ridge 100 located approximately at the level where the upper portion 12 of the tank 10 terminates.

The filter 62 is surrounded by an outer filter 102 as a radially inner filter, and the filter 62 is surrounded by an outer filter 102 as a radially inner filter.
The ridge portion 100 of the filter 102 is tightly connected to the filter 102. The outer filter 102 expands downward from the ridgeline portion 100 into a frustoconical shape, and has a cone angle larger than that of the inner filter 62. The outer filter 102 terminates in a bottom ring 104 whose diameter is substantially larger than the diameter of the bottom ring 64 and which fits tightly against the inner wall of the upper portion 12 of the tank.

The filters 62, 102 are made of elastic material and are fixed to each other between the baffle plate 58 and the upper part 12 of the tank like a disc spring arrangement, and are held together only by this fixation.

[Brief explanation of drawings]

1 to 3 are longitudinal sectional views of first, second and third embodiments of the fluidized bed apparatus of the present invention, respectively. 10...Tank, 12...Upper part, 14...
Lower part, 16... Support part, 18... Route, 2
0,60...Void, 22,30...Conduit, 24...
...Nozzle for liquid, 26... Orifice, 28...
... Chamber, 32 ... Bowl-shaped part, 36 ... Support ring, 3
8... Connection portion, 42... Support arm, 40... Support tube, 44... Turning body, 46... Piston-cylinder device, 50... Descending pipe, 54... Annular space,
56... Gas inflow pipe, 58... Rectifying plate, 62,1
02... Filter, 64, 104... Bottom ring, 66, 68... Seal, 72... Head mounting member, 74... Gas outflow pipe, 80, 82... Partition wall,
88... Turning path, 96... Shield, 98... Tie rod.

Claims (1)

[Scope of Claims] 1. In order to mix, dry, granulate, pelletize, coat and/or crush materials, the material has a substantially rotationally symmetrical shape, for example a conical shape, at least about a substantially vertical axis A, and a gas A tank 10 connected to a supply source to move, in particular flow, the material therein; and an annular ridge line C disposed above the tank 10.
rectifier plate 58 which has a vaulted ceiling and diverts the upward gas accompanied by the material outward and downward;
and a gas outlet pipe 74 disposed above the baffle plate, in which an annular filter 62 is disposed coaxially with the baffle plate 58 in close contact with the baffle plate, and the radius of the filter 62 is set. Current plate 58 only in the outward direction
A fluidized bed apparatus characterized in that a rectifying plate is formed in a size that allows gas to flow upward through the filter 62, and a gas outflow pipe is connected to the internal space of the filter 62. 2. The rectifier plate 58 has a ridgeline C, and the diameter of the bottom of the filter 62 corresponds at least approximately to the diameter D of the ridgeline of the rectifier plate 58. Claim 1 The fluidized bed apparatus described in . 3. The fluidized bed apparatus according to claim 1 or 2, wherein the filter 62 is fixed between the rectifying plate 58 and the annular joint 70 of the tank head mounting member 72. 4. The filter 62 has a bottom ring 64 that expands radially outward from the upper contracted end and holds a seal 66 on the lower surface. Fluidized bed equipment. 5. The filter 62 that is placed in close contact with the current plate 58 is used as an inner filter, and is surrounded by an annular outer filter 102 on the outside thereof.The inner filter 62 has a bottom ring 64 that is placed in close contact with the current plate 58, and both filters are 62 and 102 form a common annular ridgeline 100 on the upper side, and the outer filter 102 has a bottom ring 10 disposed in close contact with the tank.
4. The fluidized bed apparatus according to claim 1, characterized in that the fluidized bed apparatus is configured to have a. 6. Both filters 62, 102 are configured as self-retaining filters, and the bottom rings 64, 104
The fluidized bed apparatus according to claim 5, characterized in that the fluidized bed apparatus is configured to be elastically held only by being installed on the rectifying plate 58 or the tank 10. 7 The outer filter 102 is connected to the upper annular ridgeline portion 1
7. The fluidized bed apparatus according to claim 5 or 6, wherein the fluidized bed apparatus expands downward in a truncated conical shape from 00. 8. The inner filter 62 similarly expands downward in a truncated conical shape, and the bottom ring 64 is placed on the radially outer region of the annular ridge line C of the current plate 58. A fluidized bed apparatus according to claim 7.