JPS6186938A - Fluidized bed apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The invention provides a method for mixing, drying, granulating, pelletizing and/or crushing materials at least around a substantially vertical axis ★. A tank having an approximately rotationally symmetrical shape, for example a conical shape, connected to a gas supply to allow the material to move, in particular flow, inside the tank and a vaulted ceiling arranged above the tank and having an annular ridgeline &1- , a baffle plate that diverts the upward gas carrying the material outward and downward;
The present invention relates to a fluidized bed apparatus equipped with a gas outlet pipe disposed above a baffle plate.

(Prior Art) A known fluidized bed device of this kind (European Patent Publication No. 10)
No. 3900) (In this case, the gap between the baffle plate and the gas outlet pipe placed above the baffle plate is only partially utilized. That is, the descending pipe is provided in the center of this gap. This descending pipe extends from above through the baffle to the lower region of the tank and only delivers 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 baffle plate is abandoned as an unused area, where the gas flows at a very low velocity towards the gas outlet tube, allowing fluff and particles of entrained material to pass freely through. Therefore, it tends to accumulate radially inward 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 on the current plate, and closely arranged in the radial direction of the filter. The present invention is characterized in that the rectifying plate is formed in a size that allows gas to flow upward using rectifying sheet metal gauze only on the outside, and that a gas outflow pipe is connected to the internal 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. Therefore, the accumulation of dust 2 and material particles in the radially inward region of the upper surface of the current plate is 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 a filter either entirely or partially within the tank, the need for an external filter is eliminated, resulting in an overall space-saving arrangement.

In a preferred embodiment of the present 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.

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.

Furthermore, in a preferred embodiment of the invention, the filter:
It shall have a bottom ring which expands radially outward from the upper contracting portion and retains a seal on its lower surface.

Furthermore, in a preferred embodiment of the present invention, the filter that is brought into close contact with the rectifying plate is connected to the inner filter (, 7 and the outer side thereof).
A ring-shaped outer filter (one with a bottom ring that surrounds the inner filter and is tightly placed on the rectifying plate), both filters form a common annular ridgeline above, and the outer filter is tightly attached to the tank. The bottom ring is configured to include a bottom ring.

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 constructed as self-retaining filters, which are held elastically only by the installation of the bottom ring on the baffle plate or tank. This configuration 1 makes it particularly easy to attach the filter.

Furthermore, in a preferred embodiment of the present invention, the inner filter similarly expands downward in a frusto-conical shape, and the bottom ring is placed in the radially outer region of the annular ridge of the baffle plate. The configuration is as follows.

(Example) The present invention will now be described in detail 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 in the illustrated embodiment is approximately spherical in shape. This tank 1
o is composed of an upper part 12 and a lower part 14, both of which are formed of glass and 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 6.

An annular path 8 is formed in this support portion 16, and this path is connected to the inside of the tank 10 by a continuous annular gap 2o. A conduit 22 is introduced tangentially into a part of the annular path 8, which conduit 22 is connected to a gas supply source.

Below the annular gap 20, a plurality of liquid nozzles 24t'' are arranged at equal intervals around the axis A, and a solid material nozzle 24t'' is arranged at a small distance below the position of these nozzles. An orifice 26 is arranged which is connected to an annular chamber 28 into which a conduit 80 for solid material in powder form is tangentially introduced.

The support portion 16 is located radially inwardly below this orifice 26.
An annular chamber 28 is formed by connecting the forest part 32 late and attaching an outer wall 84 around the substantially cylindrical wall 33 of the forest part 32. Left half of Figure 1 (ring-shaped chamber 2)
8 is not shown, the outer wall 84 can be replaced by the outer wall 34' shown on the right side of FIG.
31 can also be brought into direct contact. In either case,
The outer wall 34 is pushed up onto the forest part 32 from below and supported by a support ring 361, and this support ring 36 is also attached to the forest part 32 from below and fixed with screws.

The forest 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. A turning body 44 having a rotationally symmetrical shape is arranged at the center of this connecting part 38, and the left side of FIG. A discharge state is shown when no gas is supplied to the gap 20, 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 deflection body 44 has a central part 48 with a pointed end, which projects axially downward at the lower end of the axially arranged descending tube 50 . Post 5 installed at the lower end of the descending pipe 5°
2 to form an annular space 54 extending narrowly from the cylindrical wall of the forest.

A rectifier plate 58 is arranged around the upper end of the descending pipe 50 to which the gas inflow pipe 56 is connected, and the rectifier plate 58 is made of a smooth thin plate and has an annular vaulted ceiling k f having a semicircular cross section.
Form like a Z-cho. This dome has a circular ridgeline C, and the diameter of this ridgeline C is approximately half the inner diameter of the tongue 10. The entire center of curvature of the cross-sectional shape of the vault describes a circle E, and this circle E is located on the equatorial plane of the approximately spherical tank 0. The current plate 58 is closely connected to the upper end of the descending pipe 5o, and is arranged so that an annular gap 60 is formed between the current plate and the tank 10. It shall be considerably larger than the surface shape.

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 from the upper contracted top surface in a conical shape, and a ring-shaped seal 66 embedded in the lower surface of the bottom ring allows the ridge line C of the current plate 58 to be expanded. Block off an area.

A ring-shaped support surface 70 is sealed above the filter 62 by a wide ring-shaped seal 681, and this support surface 70 is provided on a head mounting member 72 above the tank.

This head mounting member 72 is provided with a gas outlet pipe 747, which can be connected by conventional means (not shown) to a device for repurifying the discharged gas.

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 deflection body 44 which is in the lowered position in the operating state, passes vertically upwards around the descending pipe 50 via the annular space 54, and is deflected by the rectifier plate 58 (the deflection body 44 is deflected from the lower position on the outside of the rectifying plate 58). , the lower region F of the current plate produces a toroidal swirl. This swirl is held by additional air, which is introduced into the tank 10 through the annular gap 20, and this introduced air is directed downward. The flow is inclined inward.

A liquid or liquid mixture is injected into the additional air flowing through the air gap 20 via a nozzle 24 for liquid and a powdered solid or powder mixture via a nozzle 26 for powder. A particulate composition is generated inside the air vortex, and this particulate composition is moved upwardly on the rising airflow around the descending pipe 50, radially outwardly by the baffle plate 58, and then Turn downward. The additional air flowing in through the annular gap 20 constitutes an air cushion from which the particulate composition or other material to be treated from the tank 10f, which falls uniformly downwards, is disposed above the annular space 54. It begins to move upward in the axial direction again.

The used air flows upward through the annular gap 6 fJ, is filtered by the filter 62, and flows out from the gas outlet pipe 74.

The fluidized bed apparatus described above can also be used for other applications.

For example, the granulating kernels or treated granular material can be introduced into the tank 10 and racked or ground in this tank.

FIG. 2 shows a second embodiment of the present invention, which differs from the embodiment shown in FIG. Two annular gaps 76 and 78 are provided in the support part 161 radially inward of the annular gap 20 as gas inlets, and the turning body 44 is directly connected to the support part 16 .

The annular gaps 20 and 76 on the one hand and the annular gaps 768 and 78 on the other hand are separated from each other by an annular partition 80 or 82 provided on the support 16f, and these partitions 8
0.82 is an annular path】S, in the column 84 or 86i
I support you more than this. The air gap 20° 76 opens directly into the tank 10. The air gap 78 is connected to an annular deflection path 88, which is formed between the deflection body 44 and the side surface 90 of the bulkhead made of sheet steel. The side surface 90 is parallel to the axis r
It is fixed by J bolts 92, and these bolts 92 are inserted into the turning body 44 from above.

A nozzle support 94 is inserted from below into an axial hole formed in the turning body 44, and the nozzle support 94 is made to protrude upward from the turning body 44 in the radial direction inside the opening of the annular turning path 88. An annular array of nozzles 24 is provided for spraying liquid material.

A conduit 22 connected to a gas source t is opened in the annular path 8 of the support part 16, similar to the embodiment shown in FIG.
In contrast to the embodiment shown in Figure f, the conduit 30 for the powdered solid material is also opened.

The current plate 58 has a shielding body 96 at the center, and this shielding body 96
are fixed by tie rods 98. This tie rod 98
f The rectifying plate 58 and the filter 62 are removably tightened to the entire head mounting member 72.

An eighth embodiment is shown in FIG. 3, and in this embodiment,
Filter 62 has a bottom ring 64 having a larger diameter than that shown in FIGS.

The bottom ring 64 shown in FIG. 3 is placed on the current plate 58 radially outward from the annular ridge line CD of the current plate 58. As shown in FIG. Outside the ridgeline portion of the current plate, the slope becomes steeper toward the outside, so that no material powder or granules are deposited on the current plate 58. The filter 62 has an annular ridgeline portion 100 that tapers upward from the bottom ring 64 (in a conical shape).
, and this ridge line is the upper part 12 of the tank 10.
Position it at the height where it ends.

The filter 62 is a radially inner filter that surrounds the outer filter 02I, and the ridgeline part 1 of the filter 62
00 is tightly coupled to filter 102. The outer filter 102 is expanded downward from the ridge line 00 into a frustoconical shape, and has a cone angle larger than that of the inner filter 62. Outside 17) Filter 10
2 terminates in a bottom ring 104, which
diameter (considerably larger than the diameter of the bottom ring 64,
It is brought into close contact with the inner wall of the upper part 12 of the tank.

The filters 62 and 102 are made of an elastic filter material and have a V-groove bottom, and are fixed to each other between the rectifying plate 58 and the upper part of the tank 2 like a disc spring arrangement, and are held only by this fixing flea. do.

[Brief explanation of the drawing]

1 to 3 are longitudinal sectional views of the first, second and third embodiments of the fluidized bed apparatus of the present invention, respectively. 10... Tank 12... Upper part] 4.
・Lower part 16...Support part】8...Route
20, 60...Gap 22, 30...Conduit
24... Liquid nozzle 26... Orifice 28... Chamber 32... Bowl-shaped part 36.
・Support ring 38...Connection part 42...Support arm 40...Support tube 44・Turning body ÷6
... Piston-cylinder device 50 ... Descending pipe 54 ... Annular space 56 - Gas inflow pipe 58 ... Rectifier plate 62 , 102 ... Filter 64 , 104 ... Bottom ring 66 , 6
8 Seal 72 Head mounting member 74 Gas outflow pipe 80 , 82 Bulkhead 88 Turning path 96 Shield 98 Tie rod

Claims (1)

[Claims] 1. For mixing, drying, granulating, pelletizing, racking and/or crushing the materials, a substantially rotationally symmetrical shape, for example a conical shape, at least about a substantially vertical axis (A) is provided. None, a tank (10) connected to a gas supply source to move, in particular flow, the material inside, and an annular ridge (C) arranged above the tank (10).
A fluidized bed device comprising a rectifier plate (58) which has a vaulted ceiling and which diverts the upward gas accompanied by material outward and downward, and a gas outlet pipe (74) disposed above the rectifier plate. In this case, an annular filter (62) is disposed coaxially with the current plate (58) in close contact with the current plate, and the gas is directed upward through the current plate (58) only on the radially outward side of the filter (62). A fluidized bed apparatus characterized in that a rectifying plate is formed in a size that allows gas to flow out into the filter (62), and a gas outflow pipe is connected to the internal space of the filter (62). 2. The current plate (58) shall have a ridgeline portion (C),
2. The fluidized bed apparatus according to claim 1, wherein the diameter of the bottom of the filter (62) corresponds at least approximately to the diameter (D) of the ridgeline of the baffle plate (58). 3. Claim 1 or 2, characterized in that the filter (62) is fixed between the rectifier plate (58) and the annular joint (70) of the tank head attachment member (72). The fluidized bed apparatus described in . 4. A patent characterized in that 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. A fluidized bed apparatus according to claim 2. 8. The filter (62) in close contact with the rectifier plate (58) was used as an inner filter and surrounded by an annular outer filter (102) on the outside thereof, and the inner filter (62) was arranged in close contact with the rectifier plate (58). Both filters (62, 102) form a common annular ridge (100) at the top, and an outer filter (64).
102) is a bottom ring (104) placed in close contact with the tank.
The fluidized bed apparatus according to claim 1, characterized in that the fluidized bed apparatus is configured to have the following. 6. Both filters (62, 102) are configured as self-retaining filters, and are elastically retained only by the installation of the bottom ring (64, 104) to the rectifying plate (58) or tank (10). A fluidized bed apparatus according to claim 5, characterized in that: 7. The outer filter (102) has an upper annular ridgeline (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 mounted on the radially outer region of the annular ridgeline (C) of the current plate (58). 8. The fluidized bed apparatus according to claim 7, wherein the fluidized bed apparatus is configured such that