JP2996809B2 - Granulator using fluidized bed - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has been developed for performing various types of granulation processes such as granulation of powder in a desired state, drying of wet powder, mixing, cooling, sizing and coating of powder. More specifically, a supply unit for supplying granulated raw material into the casing is provided at an upper part of a cylindrical casing, and the supply unit is provided at a lower part of the casing. The present invention relates to a granulating apparatus utilizing a fluidized bed provided with a granulating section for temporarily storing a supply from the reactor and granulating the stored substance in a fluidized bed state.

[0002]

2. Description of the Related Art As such a granulating apparatus utilizing a fluidized bed, for example, a perforated plate is fixedly provided at the lowermost portion of a casing, and a powder reservoir is formed above the perforated plate. Via the perforations of the plate, the granulation unit is configured so that the ventilation from the bottom of the casing is ejected upward to the storage unit, and the powder in the storage unit is passed through the perforations for various granulation processes. There is a configuration in which the powder is suspended by the jetting gas ejected upward to make the powder into a fluidized bed state for various granulation processes. When performing various types of granulation using a conventional apparatus having such a configuration, when the raw material powder is a light / irregular shaped powder, the powder is effectively suspended to form an effective fluidized bed. Although various types of granulation can be easily performed, when the raw material powder is heavy and spherical, there are the following problems. That is, in the above-mentioned conventional apparatus, the raw material powder is merely suspended by the upward jet gas to form a fluidized bed for various granulation treatments, so that the powder is effectively suspended. As a result, an effective fluidized bed cannot be formed, and there is a problem that various granulation processes cannot be easily performed.

Therefore, as a granulating apparatus utilizing a fluidized bed which can solve such a problem, a storage section for powder is formed at the lower part of the casing, and the stored material in the storage section is sent to the storage section by air ( For example, the above-mentioned conventional apparatus is made to float by an upwardly ejected gas passing through a perforated plate, and furthermore, a stirring blade for stirring the stored material (specifically, around a vertical rotation axis center). It is considered that the granulating section is constituted by providing a rotatable stirring blade (see, for example, JP-A-61-197).
028). In the case of such a granulating apparatus utilizing a fluidized bed with a stirring function, the powder is suspended by the air supply and stirred by the stirring blades to form an effective fluidized bed, so that the raw material powder is heavy. Various granulation processes can be easily performed even in the case of a quality / spherical shape as compared with the above-described conventional apparatus. However, when performing various types of granulation treatment using a fluidized bed utilizing granulation apparatus with a stirring function, the stirring blades are constantly in contact with powder and easily damaged, so that the life thereof is shortened. The provision of the stirring blades causes a new defect, such as troublesome maintenance.

Therefore, as a granulating apparatus utilizing a fluidized bed which can solve the above-mentioned problem without providing the above-mentioned stirring blade which causes such a new defect, the upper surface is formed as a conical surface projecting upward. A plurality of umbrella-shaped bodies are combined in upper and lower multi-stages to form a powder storage portion above the umbrella-shaped bodies, and the multi-stage umbrella-shaped bodies are rotatably provided around a vertical axis of rotation. A configuration in which the jet gas is blown out from a gap between the lower edges has been considered (for example, see Japanese Patent Application Laid-Open No. 2-293852). According to such a multi-stage umbrella-type granulator, while the powder flows downward along the upper inclined surface of each umbrella, the centrifugal force is applied to the powder by the rotation of the multi-stage umbrella. Since the powder is applied and the powder is suspended by the jetting gas, even if the raw material powder is heavy or spherical, the powder becomes a relatively effective fluidized bed state and various kinds of powder are formed. Grain processing can be easily performed.

[0005]

However, the above-described multistage umbrella-type granulator also has the following problems. That is, in order to bring the powder into an effective fluidized bed state, in addition to the application of centrifugal force to the powder by the rotation of the umbrella and the floating action by the ejected gas, the upper surface of each umbrella against the powder Utilizing the downward flow action along the inclined surface, the upper inclined surface is formed with a large step between the lower outer edges of the vertically adjacent umbrella-like bodies, and powder is applied to the large step portion. There is a case where the stagnation is caused, and the downward flow of the stored material may be greatly hindered, and as a result, a fluidized bed of the powder may not be effectively formed and various granulation processes may not be effectively performed. There was a problem. The present invention has been made in view of such a situation, and has as its object to provide means capable of solving the above-described problems while solving the above-described problems in the multistage umbrella-type granulator. And

[0006]

According to the present invention, a granulating apparatus utilizing a fluidized bed according to the present invention is provided with a supply section for supplying granulated raw material into the casing above a cylindrical casing, A granulation unit using a fluidized bed, wherein a granulation unit for temporarily storing the supplied material from the supply unit and granulating the stored material in a fluidized bed state is provided at a lower part of the granulation, To configure the part, a rotating disk having an upper surface formed in an upwardly projecting conical surface and forming a storage portion of the supply above the conical surface is provided around a vertical rotation axis in the casing. A rotatable disk is provided, and a gas outlet for receiving air from the bottom of the casing and jetting the air to the storage portion is opened on the upper surface of the rotating disk in a radially outward direction of the rotating disk. That it is formed in a state It has a characteristic feature of the 1.

A granulating apparatus utilizing a fluidized bed according to the present invention has a first characteristic configuration, and is provided at a lower portion of the casing so as to be rotatable around a vertical axis of rotation and a central through hole of the rotating disk. A rotating shaft that can be fitted and inserted freely, and by tightening a fastening cap on the upper end portion of the rotating shaft that is inserted into the center through hole, the rotating disk is rotatably provided around the rotating shaft center. As a second characteristic configuration, the fastening cap is provided with a stirring blade for stirring the stored matter.

[0008] The granulating apparatus utilizing a fluidized bed according to the present invention has the first characteristic configuration or the second characteristic configuration, and temporarily accommodates the ventilation from the bottom of the casing in the rotating disk. A third characteristic configuration is to provide a ventilation accommodation space for guiding accommodation ventilation to the gas ejection port.

[0009]

When various granulation processes are performed by the apparatus according to the present invention having the first characteristic configuration, the powder in the storage section is annularly formed by the gas ejected radially outward from the gas ejection port. In addition to receiving an outward moving force while being in a floating state, a centrifugal force due to the rotation of the rotating disk and a downward moving force along an inclined surface of the rotating disk upper surface are applied. The body flows in the centrifugal direction from above the inclined surface of the upper surface of the rotating disk, reaches near the inner wall of the casing, and then rises along the inner wall, and then flows obliquely downward in the center direction of the casing. It is returned on the inclined surface, and further, these series of flow phenomena are repeated. In other words,
The powder in the reservoir is fluidized in an annular shape by outward ventilation from the gas outlet, and the fluidized annular fluid has a fluid action along an inclined surface of the upper surface of the rotating disk. Since the swirling action by the rotation of the rotating disk is provided in a complex manner, the powder forms a circulating flow like a rope while being uniformly mixed. Moreover, since the inclined surface of the upper surface of the rotating disk is a simple smooth inclined surface except for the gas ejection port,
There is no large step portion on the inclined surface as in the conventional multi-stage umbrella-type granulator, and therefore, the powder stays in the large step portion as in the conventional case, and the smooth circulation and flow of the powder is hindered. Will be avoided. Therefore, even if the properties of the powder in the storage section are not suitable for forming an effective fluidized bed, a fluidized bed effective for various granulation processes is formed.

In the case where various types of granulation processing are performed by a granulating apparatus utilizing a fluidized bed having the second characteristic configuration, the stirring blades rotate with the rotation of the rotating disk, and the powder in the storage section is rotated. Is stirred, and the stirring causes a more effective fluidized bed to be formed in the powder in the storage section. In addition, the stirring blade is in contact with the powder as in the past, and is easily damaged by contact with the powder. However, the stirring blade can be replaced or repaired by removing the fastening cap integrally formed with the stirring blade. Can be easily performed, and therefore, the maintenance thereof is easier than before.

In the case where various types of granulation processing are performed by a granulating apparatus utilizing a fluidized bed having the third characteristic configuration, the blast air from the gas jet port is jetted after being temporarily stored in the ventilation accommodating space. Therefore, since the gas acts on the powder in the storage section, regardless of the conditions on the gas supply side, such as the distance between the gas ejection port and the upstream gas supply section, the ejection from the gas ejection port Air is blown out at a constant pressure, and the blown air uniformly acts on the powder.

[0012]

According to the first feature, even if the properties of the powder in the storage section are not suitable for forming an effective fluidized bed, a fluidized bed effective for various granulation processes is formed. The effect is that various granulation processes can be effectively performed.

According to the second characteristic configuration, the effect of the first characteristic configuration described above can be further promoted by the agitating action, and the maintenance by providing the agitating blades is difficult to perform. As compared with a device having a stirring function, the effect is improved, and various granulation processes can be performed more effectively and with good workability.

According to the third characteristic configuration, the tolerance of the design standard of the gas ejection port in the rotating disk is improved,
There is an effect that a more effective device design can be achieved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIGS. 1 to 4 show a first embodiment of a granulating apparatus utilizing a fluidized bed according to the present invention. After the raw material powder and the binder are supplied as the granulated raw material, by driving the apparatus, the granulated raw material is formed into a fluidized bed state in the apparatus, and the granulation to the powder in a desired state is performed. It has become.

In FIG. 4, reference numeral 1 denotes a casing constituting an outer shell of the main body of the granulating apparatus, and the casing 1 is formed of a cylindrical body having an upper portion slightly larger in diameter than a lower portion. A supply unit 15 for supplying a raw material powder of the granulated raw material into the casing 1 is provided on an upper portion of the casing 1 (specifically, an enlarged diameter portion of the casing 1). In the lower part of the casing 1, a granulating unit 3 for temporarily storing the supply material (that is, the raw material powder) from the supply unit 15 and making the stored material in a fluidized bed state to perform the granulation. Is provided.

A blower 4 with an air filter 4a is provided on the side of the casing 1, and air supplied from the blower 4 into the casing 1 is heated to a proper temperature by a heater 5. The casing 1 via an air supply port 1a provided on the side of the bottom of the casing 1.
Is supplied to the bottom. The heating of the air supply by the heater 5 is controlled so that the temperature measurement value of the air supply by the temperature sensor 5a provided at the outlet of the heater 5 matches the set temperature. .

In the casing 1, the supply section 15 is provided.
, The raw material powder is supplied, and the binder is supplied in addition to the raw material powder. The binder is disposed in a vertical position at a central portion in the casing 1 and has an upper end supply portion 8a (the compressed air supply device 6 and the binder supply device 7
Is connected to the downstream end of the pipe from the filter unit 2 which is passed through the filtration unit 2 attached to the uppermost part of the casing 1, and the lower end spray unit 8b (the part of which is the granulation unit) 3 functioning as a spray port for spraying the binder toward the granulation unit 3 is sprayed and supplied to the granulating unit 3 by a nozzle 8 opened at a lower part in the casing 1. That is, while the binder is supplied from the binder supply device 7, the compressed air from the compressed air supply device 6 is used as a carrier gas while being sprayed and supplied to the granulating section 3 by the nozzle 8. .

A part of the pipe from the compressed air supply device 6 and the binder supply device 7 (a pipe branched from the middle of the above-mentioned pipe) is connected to a binder supply port 1b on the lower side of the casing 1. Then, the casing 1 is opened in the casing 1, and the binder is supplied from the opening as appropriate using compressed air as a carrier gas. Further, the filter unit 2 is provided with a filter 2a for filtering suction and exhaust air from the inside of the casing 1 and also connected to a pipe leading to an exhaust device 9 for discharging the suction and exhaust to the outside of the apparatus. In addition, a blow tube 2b for blowing compressed air to the filter 2a in order to wash the filter 2a is provided in the filtration unit 2. A pipe from the compressed air supply device 6 is partially branched and connected to the blow tube 2b.

The granulating section 3 provided at the lower part of the casing 1 is configured as shown in FIG. That is, a rotating disk 10 having an upper surface formed in a conical surface projecting upward is provided at a lower portion of the casing 1 so as to be rotatable around a vertical rotation axis in the casing 1. Then, above the upper surface conical surface of the rotating disk 10,
The storage part A of the supply material supplied from the supply part 2 is formed, and the granulation part 3 is configured. More specifically, a central through hole 10
b is formed in the lower part of the casing 1 so as to be rotatable about a vertical axis of rotation by a driving force of a motor 13 disposed below the bottom of the casing 1 and fitted into the center through hole 10b. A rotatable shaft 11 that can be freely inserted and inserted is provided. The center through hole 10 of the rotating disk 10
The upper end portion of the rotary shaft 11 inserted into the upper end portion (a male screw is formed at the portion) of the rotary shaft 11 has a substantially conical shape and a female screw with a downward opening formed therein. The rotating disk 10 is rotatably provided around the rotation axis by tightening the female screw 12 with the female screw. The granulation unit 3 is formed by forming a storage unit A for the supply material supplied from the supply unit 2 above the upper conical surface of the rotating disk 10.

As described above, the air supply from the blower 4 is introduced into the bottom of the casing 1 through the air supply port 1a of the casing 1 as described above. The inside of the rotating disk 10 is a conical cavity, and the conical cavity forms a ventilation accommodating space B for temporarily accommodating the ventilation from the bottom of the casing 1. In the vicinity of the center of the bottom of the rotating disk 10,
As shown in FIG. 3, gas receiving ports 10 d that receive air supplied from the blower 4 and supply the air to the ventilation housing space B are formed at four locations.

At the upper part of the rotating disk 10, a gas outlet 10 a for discharging the supply air to the storage section A is formed in a state of being opened radially outward of the rotating disk 10. Specifically, the gas ejection port 10a is shown in FIG.
As shown in (1), it is composed of a pair (two) of large-diameter semi-arc grooves and a pair (two) of small-diameter semi-arc grooves, for a total of four semi-arc grooves.

The air supplied to the bottom of the casing 1 (that is, the air supplied from the blower 4 to the bottom of the casing 1 via the air supply port 1a) is:
A gas receiving port 10d formed in the lower part of the rotating disk 10
After being introduced into the ventilation storage space B through the air storage space and temporarily stored therein, the air is discharged from the ventilation storage space B to the storage section A via the gas outlet 10a.

A part of the supply air supplied to the bottom of the casing 1 also passes through the gas receiving port 10d from the gap S between the lower inner peripheral surface of the casing 1 and the outer edge of the rotating disk 10. Before passing through, it is separated and ejected to the storage section A.

When the apparatus of the present invention configured as described above performs a granulation process on powder in a desired state, first, raw material powder is supplied from the supply unit 15 and the raw material powder is stored in the storage unit A. After that, the rotating disk 10 is driven to rotate. Then, a binder is added to the raw material powder from above using the nozzle 8 while continuing the rotation drive. By performing such a process, a granulated raw material (hereinafter, simply referred to as powder) composed of the raw material powder and the binder,
The gas ejected radially outward from the gas ejection port 10a (and the gas ejected upward from the gap S) receives an outward moving force while floating in an annular shape, and is caused by the rotation of the rotating disk 10. Since the centrifugal force and the downward moving force along the upper surface inclined surface of the rotating disk 10 are applied, the powder flows in the centrifugal direction from the upper surface inclined surface of the upper surface of the rotating disk 10 by the synergistic action thereof. After reaching the vicinity of the inner wall of the casing 1, it rises along the inner wall, flows obliquely downward in the center direction of the casing 1, and is returned to the upper side of the upper inclined surface of the rotating disk 10.
These series of flow phenomena are repeated. In addition, the inclined surface of the upper surface of the rotating disk 10 is
Except for the portion of the above, since it is simply a smooth inclined surface, there is no large step portion on the inclined surface as in the conventional multi-stage umbrella-type granulating apparatus, and therefore, the large step It is possible to prevent the powder from staying in the portion and hindering the smooth circulation and flow of the powder. Therefore, even if the properties of the powder in the storage section A are not suitable for forming an effective fluidized bed, a fluidized bed effective for the granulation treatment is formed.

Further, the gas ejected from the gas ejection port 10a is ejected after being temporarily stored in the ventilation accommodating space B and acts on the powder in the storage section A. Irrespective of the conditions on the gas supply side, such as the distance to the upstream gas supply unit 10a, the gas ejected from the gas ejection port 10a is ejected at a constant pressure, and the ejected gas acts uniformly on the powder. I will be.

[Second Embodiment] As shown in FIG. 5, the storage portion A is different from the fastening cap 12 in the first embodiment.
An embodiment is also conceivable in which the stirring blade 14 for stirring the stored material in the above is integrally provided. The stirring blade 1
The reference numeral 4 is provided along the upper inclined surface of the rotating disk 10. When such a stirring blade 14 is provided, the stirring blade 14 rotates with the rotation of the rotating disk 10 and stirs the powder in the storage part A,
By the stirring, a more effective fluidized bed is formed on the powder in the storage section A. Moreover, the stirring blade 14
Is easily damaged due to constant contact with the powder, but by removing the fastening cap 12 integrally formed with the powder, operations such as replacement and repair can be easily performed.

Third Embodiment An embodiment in which the agitating blades 14 in the above-described second embodiment are provided at an angle to the inclined surface of the upper surface of the rotating disk 10 as shown in FIG. 6 is also considered. Can be When such a stirring blade 14 is provided, there is a stirring effect equivalent to (or equal to or greater than) the stirring blade 14 in the second embodiment. In addition, since the stirring blades 14 can be easily removed, operations such as replacement and repair are easy.

The stirring blade 14 in the second embodiment or the third embodiment may be provided on the fastening cap 12 so as to be sandwiched between the fastening portions of the fastening cap 12 with respect to the rotating shaft 11. The workability is good.

[Fourth Embodiment] The gas ejection port 10a formed in the upper surface of the rotary disk 10 to be opened radially outward.
Is not limited to the arc-shaped groove as in the above-described embodiment. For example, a number of holes as shown in FIG. 7 may be used. Further, the gas ejection port 10a formed of a large-diameter semi-arc groove and the gas ejection port 10a formed of a small-diameter semi-arc groove in the first embodiment can be arranged such that the latter is 90 ° out of phase with the former in plan view. Good. Further, three or more arc-shaped grooves may be formed.

The apparatus of the present invention can be applied to various kinds of granulation processing other than granulation of powder in a desired state, for example, drying of wet powder, mixing, cooling, sizing and coating of powder. It goes without saying that it can be applied.

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of a device of the present invention (first embodiment).

FIG. 2 is a plan view of a rotating disk constituting a part of the main part.

FIG. 3 is a bottom view of the rotating disk.

FIG. 4 is an overall configuration diagram of the device of the present invention (first embodiment).

FIG. 5 is a longitudinal sectional view showing a main part of the device (second embodiment) of the present invention.

FIG. 6 is a longitudinal sectional view showing a main part of a device (third embodiment) of the present invention.

FIG. 7 is a plan view of a rotating disk constituting a part of a main part of the device of the present invention (fourth embodiment).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 3 Granulation part 10 Rotating disk 10a Gas ejection port 10b Center through-hole 11 Rotation shaft 12 Fastening cap 14 Stirrer blade 15 Supply part A Storage part B Vent accommodation space

Claims (3)

(57) [Claims] 1. A supply section (15) for supplying granulated raw material into the casing (1) is provided at an upper portion of the cylindrical casing (1), and a supply section (15) is provided at a lower portion of the casing (1). A granulating apparatus utilizing a fluidized bed, which is provided with a granulating section (3) for temporarily storing a supplied material from a supplying section (15) and granulating the stored substance in a fluidized bed state, wherein the granulating apparatus comprises: To form the grain part (3), a rotating disk (10) having an upper surface formed in an upwardly projecting conical surface and forming a reservoir (A) for the supply above the conical surface is provided in the casing. The casing (1) is provided so as to be rotatable around a vertical axis of rotation in (1), and on the upper surface of the rotating disk (10).
Receiving the ventilation from the bottom of the storage part (A)
A granulating apparatus utilizing a fluidized bed, wherein a gas ejection port (10a) for ejecting gas to the outside is opened in a radially outward direction of the rotating disk (10). 2. A rotating disk (1) rotatable about a vertical axis of rotation at a lower portion of the casing (1).
0) is provided with a rotating shaft (11) that can be fitted and inserted into the center through hole (10b), and a fastening cap (12) is provided at the upper end of the rotating shaft (11) inserted through the center through hole (10b). ) To tighten the rotating disk (1).
2. The fluidized bed utilization method according to claim 1, wherein the rotating cap is rotatably provided around the rotation axis, and a stirring blade for stirring the stored material is provided to the fastening cap. Granulation equipment. 3. A ventilation accommodating space (B) for temporarily accommodating ventilation from the bottom of the casing (1) inside the rotating disk (10) and guiding the accommodation ventilation to the gas ejection port (10a). The granulating apparatus utilizing a fluidized bed according to claim 1 or 2, wherein the granulating apparatus is provided.