JP2006263543A - Method and apparatus for manufacturing small-diameter heavy granule - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new method and a new apparatus for manufacturing a small-diameter heavy granule for obtaining a granulated product which has minute particle size, is heavy and has a particle size distribution of narrow and uniform width. <P>SOLUTION: An ejector 10 is arranged in a fluidization chamber 5 and a nozzle 9 is arranged above the ejector 10 so that a fine particle G0 and a small-diameter granule G1 in the fluidization chamber 5 are discharged from the ejector 10 toward the nozzle 9, namely, introduced into the vicinity of the nozzle 9 by the ejector 10, therefore the fine particle G0 and the small-diameter granule G1 are coated with a liquid droplet M sprayed/jetted from the nozzle 9. In particular, even a lightweight and fine particle which does not descend against a rising airflow S2 to be generated in the fluidization chamber 5 can also be coated with a liquid raw material L, which can not be done by a conventional method. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for producing a granular material by drying a raw material liquid, and particularly to a method and an apparatus capable of efficiently producing a granule having a small particle size and a large weight. It is related.

Fluidized bed granulation as shown in FIG. 3 as an apparatus for drying a raw liquid L such as various seasonings, soups, luxury beverages such as coffee and tea, organic acids, enzymes, etc. to obtain a granulated product G3 A dryer 1 'is used. In this apparatus, hot air is supplied into the fluid chamber 5 ', and a raw material liquid L is supplied to form a fluidized bed F, and the raw material liquid L is fluidly dried to produce a granular material.
Specifically, a so-called bottom spray method is employed in which the raw material liquid L is sprayed from the lower part of the fluidized bed F formed in the lower part of the fluidizing chamber 5 ', that is, from the upper side of the plate plate 3' into the fluidizing chamber 5 '. It is what is done. Then, the fine particles G0 obtained by drying the spray droplets M in which the raw material liquid L is formed into droplets serve as nuclei, and the raw material liquid L is coated and dried around the fine particles G1. Become. Further, such a process is continued, and a plurality of coat layers C are laminated to obtain spherical and heavy (about 600 kg / m ³ ) small-diameter heavy granules G2 (see, for example, Patent Document 1).

However, in the case of such a bottom spray type fluidized bed granulator / dryer 1 ′, the sprayed droplet M is coated on the grown small-diameter heavy granule G2 located in the lower layer portion of the fluidized bed F and is overgrown. It was inevitable. For this reason, the operating conditions are adjusted, for example, by setting the hot air blowing speed low, but it is difficult to suppress the average particles to 150 μm or less, and the processing amount is further reduced. Was inevitable.
In addition to this, the fine particles G0 that cannot descend against the ascending airflow S2 generated in the flow chamber 5 'stay in the upper part without reaching the vicinity of the nozzle 9', and the coating of the raw material liquid L is performed. Therefore, there is room for improvement in the point that the particle size distribution width of the granulated product G3 finally discharged from the fluidized bed granulation dryer 1 ′ becomes wider and a homogeneous product cannot be obtained. It was.

Therefore, in order to obtain a small-diameter granulated product G3, in order to prevent overgrowth of the small-diameter heavy granule G2, the nozzle 9 'is attached above the fluidized bed F and the raw material liquid L is sprayed upward. Measures can be considered. However, even if it does in this way, the spray droplet M is dried as it is, and it does not fully contribute to a coating with respect to the small diameter granule G1 in the fluidized bed F. As a result, the granulated product G3 is light and has high dusting property. It becomes a thing.
JP 11-319534 A

  The present invention has been made in view of such a background. The granulated product has a fine and heavy particle size, and further has a narrow particle size distribution width to obtain a homogeneous granulated product. The development of a novel method for producing small-sized heavy granules and an apparatus therefor is a technical issue.

That is, in the method for producing a small-sized heavy granule according to claim 1, the fluid wind blowing chamber, the fluid chamber and the exhaust chamber are connected in the vertical direction, and a plate plate is partitioned between the fluid wind blowing chamber and the fluid chamber. In addition, a nozzle for jetting the raw material liquid is provided in the fluid chamber, and the raw material liquid supplied from the nozzle to the fluid chamber is fluidized and dried by hot air supplied from the fluid air blowing chamber to the fluid chamber. In the method of obtaining the body,
An ejector is provided in the fluid chamber, and further, the nozzle is provided above the ejector, and the ejector ejects fine particles and small-diameter granules in the fluid chamber toward the nozzle, in the vicinity of the nozzle. By increasing the moving speed of the fine particles and small-diameter granules, the coating of the raw material liquid is formed on the fine particles and small-diameter granules, and the adhesion between the fine particles and small-diameter granules is suppressed. .
According to the present invention, since the fine particles and small-diameter granules located in the flow chamber can be guided to the vicinity of the nozzle by the ejector, the spray droplets ejected from the nozzle can be coated on the fine particles and the small-diameter granule. In particular, in the conventional method, it is possible to coat the raw material liquid on the light-weight fine particles that could not be lowered against the ascending air flow generated in the fluid chamber.
In addition, since the kinetic energy of fine particles and small-diameter granules in the vicinity of the nozzle can be increased, adhesion between the particles is suppressed, formation of porous and light powder particles is prevented, and a spherical shape in which a plurality of coating layers are laminated. A heavy granulated product can be obtained.
Furthermore, although it flows by the hot air supplied from the fluid air blowing chamber to the fluid chamber, the spray droplets adhere to the small-sized heavy granules that have grown to a size that does not scatter to the upper part of the fluid chamber. Without overgrowth.

In addition to the above requirements, the method for producing small-diameter heavy granules according to claim 2 is characterized in that the ejector comprises an introduction pipe and a blow pipe for blowing hot air into the introduction pipe. Only the fine particles and the small-diameter granules are selectively guided to the nozzle by positioning the lower end portion above the fluidized bed forming region in the fluidizing chamber.
According to the present invention, fine particles and small-diameter granules scattered to the upper part of the fluid chamber can be selectively guided to the vicinity of the nozzle, while the small-diameter heavy granules can be retained in the fluidized bed. In addition, since the fine particles, small-diameter granules, and small-diameter heavy granules can be classified in the fluid chamber, there is a case where it is not necessary to classify the granulated product taken out from the fluid.

Furthermore, the method for producing a small-sized heavy granule according to claim 3 is characterized in that, in addition to the requirement of claim 2, the temperature of the hot air supplied to the blowing pipe in the ejector is changed from the fluid wind blowing chamber to the fluid chamber. The amount of heat for drying the raw material liquid is increased by making it higher than the temperature of the hot air supplied to.
According to the present invention, since the amount of heat in the atmosphere near the nozzle is increased, the spray droplets adhering to the fine particles and the small-diameter granules can be quickly dried to form a coat layer, and adhesion between the fine particles and the small-diameter particles is avoided. be able to.
In addition, when producing a granulated product that must be considered for thermal degradation, the temperature of the hot air supplied from the flowing air blowing chamber to the fluidizing chamber is set low, while the hot air supplied to the blowing tube is reduced. If the temperature is set high, it is possible to prevent thermal degradation without lowering the granulation efficiency.

According to a fourth aspect of the present invention, there is provided an apparatus for producing a small-diameter heavy granule that vertically connects a fluid air blowing chamber, a fluid chamber, and an exhaust chamber, and partitions a plate plate between the fluid air blowing chamber and the fluid chamber. In addition, a nozzle for jetting the raw material liquid is provided in the fluid chamber, and the raw material liquid supplied from the nozzle to the fluid chamber is fluidized and dried by hot air supplied from the fluid air blowing chamber to the fluid chamber. In the apparatus for obtaining the above, the ejector is provided in the fluid chamber, and the nozzle is provided above the ejector.
According to the present invention, since the fine particles and small-diameter granules located in the flow chamber can be guided to the vicinity of the nozzle by the ejector, the spray droplets ejected from the nozzle can be coated on the fine particles and the small-diameter granule. In particular, in the conventional method, it is possible to coat the raw material liquid on the light-weight fine particles that could not be lowered against the ascending air flow generated in the fluid chamber.
In addition, since the kinetic energy of fine particles and small-diameter granules in the vicinity of the nozzle can be increased, adhesion between the particles is suppressed, formation of porous and light powder particles is prevented, and a spherical shape in which a plurality of coating layers are laminated. A heavy granulated product can be obtained.
Furthermore, although it flows by the hot air supplied from the fluid air blowing chamber to the fluid chamber, the spray droplets adhere to the small-sized heavy granules that have grown to a size that does not scatter to the upper part of the fluid chamber. Without overgrowth.

According to a fifth aspect of the present invention, there is provided an apparatus for producing small-sized heavy granules, in addition to the requirements of the fourth aspect, the ejector includes an introduction pipe and a blow pipe for blowing hot air into the introduction pipe. The lower end portion of the introduction pipe is positioned above the fluidized bed forming region in the fluidizing chamber.
According to the present invention, fine particles and small-diameter granules scattered up to the upper part in the fluid chamber can be selectively guided to the vicinity of the nozzle, while the small-diameter heavy granules can be retained in the fluidized bed. Further, in this way, fine particles, small-sized granules, and small-sized heavy granules can be classified in the fluid chamber, so there is a case where it is not necessary to classify the granulated product taken out from the fluid chamber.

Furthermore, in addition to the requirements of claim 5, the apparatus for producing small-diameter heavy granules according to claim 6 is configured so that the temperature of hot air supplied to the blowing pipe in the ejector is from the fluid wind blowing chamber to the fluid chamber. It is characterized in that it can be made different from the temperature of the hot air supplied to.
According to the present invention, since the amount of heat in the atmosphere near the nozzle is increased, the spray droplets adhering to the fine particles and the small-diameter granules can be quickly dried to form a coat layer, and adhesion between the fine particles and the small-diameter particles is avoided. be able to.
In addition, when producing a granulated product that must be considered for thermal degradation, the temperature of the hot air supplied from the flowing air blowing chamber to the fluidizing chamber is set low, while the hot air supplied to the blowing tube is reduced. If the temperature is set high, it is possible to prevent thermal degradation without lowering the granulation efficiency.
The above problems can be solved by using the configuration of the invention described in each of the claims as a means.

  According to the present invention, small-sized heavy granules having an average particle size of 150 μm or less can be efficiently produced, and a uniform granulated product can be obtained by narrowing the particle size distribution width.

Hereinafter, the “manufacturing method and apparatus for small-diameter heavy granules” of the present invention will be described based on the illustrated embodiment. First, the apparatus of the present invention will be described, and then the operating state of the apparatus will be described. In addition, the method of the present invention will be described.
It should be noted that the following embodiments can be appropriately modified within the scope of the technical idea of the present invention.

What is indicated by reference numeral 1 in the figure is a fluidized bed granulator / dryer as a “small-diameter heavy granule production apparatus” according to the present invention, which has an overall shape of a hollow tower, and flows to the bottom. A wind blowing chamber 2 is arranged, and a top plate 3 is provided at the top thereof, and a flow chamber 5 is provided continuously with the plate 3 as a partition, and an exhaust chamber 6 is provided above the flow chamber 5. Configured.
The fluidized bed granulator / dryer 1 is used to dry raw material liquids L such as various seasonings, soups, luxury beverages such as coffee and tea, organic acids, enzymes, etc. to obtain a granulated product G3. Here, the intermediate product from the raw material liquid L to the granulated product G3 is defined.
First, the raw material liquid L is sprayed into the fluid chamber 5 by a nozzle 9 described later, and this liquid droplet state is referred to as a spray liquid droplet M.
Further, the spray droplet M is dried and solidified by hot air supplied into the fluid chamber 5 and is referred to as fine particles G0.
Further, the fine particles G0 are coated with spray droplets M to form a coat layer C, which is referred to as a small-diameter granule G1.
Furthermore, a plurality of coat layers C are laminated on the small-diameter granule G1 to form a spherical shape and have a weight enough to remain in the fluidized bed F of the granular material formed in the lower part of the fluidized chamber 5. The grown one is called small-diameter heavy granule G2.
Furthermore, the small-diameter heavy granule G2 in which the small-diameter granule G1 and the like that have not been grown to the desired properties (particle diameter, weight) after being discharged from the fluid chamber 5 is removed is referred to as a granulated product G3. It is.
Incidentally, the term “powder” used in this specification is a general term for the fine particles G0, small-diameter granules G1, small-diameter heavy granules G2, and granulated products G3.

Hereinafter, each element constituting the fluidized bed granulation dryer 1 will be described in detail. Here, a so-called cylindrical fluidized bed granulator / dryer 1 is described as an application object of the present invention, but a so-called square fluidized bed granulator / dryer 1 can also be an application object of the present invention.
First, the flowing air blowing chamber 2 is a cylindrical member having an open upper surface, and a blowing port 2a is formed in a side peripheral portion thereof, and a hot air supply device 7 described later is connected to the blowing port 2a. The

  Next, a top plate 3 is provided at the upper part of the fluid air blowing chamber 2, which is formed by, for example, forming a number of holes in a so-called punching metal shape on a plate surface of a circular metal plate. Is.

  Next, the fluid chamber 5 is an inverted frustoconical member whose upper and lower surfaces are opened. Although not shown, a door and a monitoring window are appropriately provided on the side peripheral surface, and maintenance and visual inspection such as internal cleaning are possible. It is comprised. The shape of the flow chamber 5 may be cylindrical.

Next, the exhaust chamber 6 is a cylindrical member having an open bottom surface, and an exhaust port 6a is formed in the upper portion, and a fan 6b is provided in a pipe line connected to the exhaust port 6a. It is comprised so that the gas located in can be discharged | emitted. The exhaust chamber 6 is provided with a bag filter 6c so that dust in the exhaust can be removed.
Note that dust in the exhaust may be removed by a cyclone provided outside the exhaust chamber 6 instead of the bag filter 6c.

  Next, the hot air supply device 7 includes a heat exchanger 71 and a blower 72 and is configured to raise the temperature of the outside air supplied from the blower 72 by the heat exchanger 71.

A discharge port 5a is formed in the lower part of the side peripheral portion of the flow chamber 5, and a discharge device 8 to which a screw conveyor is applied as an example is connected to the discharge port 5a.
Further, a classifying mechanism 8A is connected to the discharging device 8. The classifying mechanism 8A receives the air blown from the blower 72, and the light-weight fine particles G0 and small-diameter granules G1 that have not reached the predetermined diameter and weight. It is a mechanism for blowing up and returning it to the fluid chamber 5. For this reason, the pipe line between the heat exchanger 71 and the flow chamber 5 in the hot air supply device 7 is branched so that the heated outside air can be supplied to the classification mechanism 8A.

In addition, a nozzle 9 is provided inside the fluid chamber 5 such that the jet outlet 9A is directed upward, and a raw material liquid L is supplied to the nozzle 9 from a pump P arranged outside. Is done.
As shown in FIG. 2, the installation location of the nozzle 9 is an upper space of the fluidizing chamber 5, and more specifically, above the fluidized bed F formed by the granular material in the fluidizing chamber 5. The location located at.
Incidentally, the fluidized bed forming region E in which the fluidized bed F is formed is expanded or contracted according to the properties of the raw material liquid L to be handled and the granulated product G3 to be manufactured.

An ejector 10 is disposed above the eye plate 3, and the nozzle 9 is positioned above the ejector 10.
As shown in FIG. 2, the ejector 10 includes a cylindrical introduction pipe 11 and a blow pipe 12 for blowing hot air into the introduction pipe 11. In this embodiment, the introduction pipe 11 is provided. The hot air discharge part 12a is positioned inside.
In this embodiment, as shown in FIG. 2, the lower end portion of the introduction pipe 11 is positioned above the fluidized bed forming region E in the fluidizing chamber 5.
Note that the blowing pipe 12 may be arranged so that the discharge portion 12a comes out of the introduction pipe 11 and is positioned below the introduction pipe 11, and hot air may be blown into the introduction pipe 11. In this case, both the lower end part of the introduction pipe 11 and the discharge part 12a of the blowing pipe 12 are positioned above the fluidized bed formation region E.

  The hot air supply device 7 branches the pipe line between the heat exchanger 71 and the blower 72 and supplies the outside air to the heat exchanger 73. The heat exchanger 73 and the blowing pipe 12 are connected to each other. By connecting, the temperature of the hot air blown out from the blowing pipe 12 can be made different from the temperature of the hot air supplied from the flowing air blowing chamber 2 to the fluidizing chamber 5.

  The fluidized bed granulator / dryer 1 applied as the “small diameter heavy granule production apparatus” of the present invention is configured as described above as an example. The “manufacturing method” will be described.

  First, when the raw material liquid L is dried to obtain a granulated product G3, the hot air supply device 7 is activated to supply hot air into the fluidized air blowing chamber 2 (for example, a temperature of 70 ° C. and a flow rate of 0.5 m / s). This hot air proceeds upward in the fluidized air blowing chamber 2, passes through the plate 3 as the fluidized bed forming flow S1, reaches the fluidized chamber 5, and eventually passes through the bag filter 6c. After that, the air is exhausted from the exhaust port 6a. In addition, after the said fluidized bed formation flow S1 forms the fluidized bed F with a granular material, the airflow of the step which goes to the exhaust chamber 6 shall be called rising airflow S2.

At the same time, hot air is discharged from the blowing pipe 12 in the ejector 10 into the introducing pipe 11 as a blowing flow S3 (for example, a temperature of 120 ° C. and a flow rate of 45 m / s). A part of the atmosphere is sucked as the drawing-in flow S4.
The blowing flow S3 and the drawing flow S4 are mixed in the introduction pipe 11 and discharged from the upper part of the introduction pipe 11 as a discharge flow S5 (flow velocity 24 m / s) toward the nozzle 9.
At this time, the flow velocity of the rising air flow S2 on the side of the ejector 10 is reduced to about 0.26 m / s by the action of the drawing flow S4 sucked from the lower portion of the introduction pipe 11.

Subsequently, the pump P is activated to supply the raw material liquid L to the nozzle 9. The raw material liquid L is ejected from the jet outlet 9 </ b> A toward the upper space in the flow chamber 5, and atomized droplets M And is supplied into the flow chamber 5.
The spray droplet M is dried by receiving heat from the rising air flow S2 and the discharge flow S5 in the upper space in the flow chamber 5, and becomes fine particles G0. Incidentally, since the heat quantity in the atmosphere near the nozzle 9 is sufficiently secured, the spray droplet M is quickly dried.

Since the fine particles G0 have a small diameter and are light, they cannot descend against the ascending air flow S2, are located above the fluidized bed formation region E (particularly above the ejector 10), and are located above the ascending air flow S2 and the discharge. It will float in this space by the action of the flow S5.
The fine particles G0 are coated with the spray droplets M newly supplied from the nozzle 9, as shown in an enlarged view in FIG. 2, and the spray droplets M are dried to form small-diameter granules on which the coating layer C is formed. G1. At this time, since the moving speed (kinetic energy) of the small-diameter granules G1 is high, the small-diameter granules G1 can be prevented from adhering to each other even when the spray droplet M is dry.
Incidentally, since the heat quantity in the atmosphere near the nozzle 9 is sufficiently secured, the spray droplet M is quickly dried.

The small-diameter granule G1 formed in this way descends against the rising air flow S2 due to its own weight, or is guided and lowered by the air flow in the flow chamber 5, and further guided into the introduction pipe 11 by the drawing flow S4. It will be ejected toward the nozzle 9. Therefore, as shown in an enlarged view in FIG. 2, the small-diameter granule G1 is coated with the spray droplet M newly supplied from the nozzle 9, and the spray droplet M is dried to form a coat layer C. . The fine particles G0 are also introduced into the introduction pipe 11 by the drawing flow S4.
Then, the layering of the coating layer C is repeated to increase the particle size and the own weight of the small-diameter granule G1, and as the growth proceeds, the particle moves to the lower space in the flow chamber 5 and eventually has a sufficient own weight. When it becomes the small-sized heavy granule G2 it has, it stays in this part and forms the fluidized bed F.
In addition, when manufacturing the granulated product G3 which should consider thermal degradation, while setting the temperature of the hot air supplied from the fluid wind blowing chamber 2 to the fluid chamber 5 low, it supplies with respect to the blowing pipe 12 If the temperature of the hot air to be set is set high, it is possible to prevent thermal degradation without lowering the granulation efficiency.

Eventually, after the elapse of a predetermined time, or when it is detected that a predetermined amount of small-diameter heavy granules G2 has been generated by a sensor as appropriate, the discharge device 8 is activated to output the small-diameter heavy granules G2 as granulated products G3 to the outside. It is something to take out. At this time, the granulated product G3 may contain small-diameter granules G1 or fine particles G0, which are blown up by the air flow supplied to the classification mechanism 8A and returned to the flow chamber 5 from the return port 5b again. It is.
Further, a shifter 8B separates a product having a predetermined particle diameter to obtain a final product, and an excessively large product is pulverized by a crusher 8C and supplied into the fluid chamber 5.
Since the ejector 10 takes in the atmosphere located above the fluidized bed F into the introduction pipe 11 as the suction flow S4, the fine particles G0 and the small-diameter granules G1 scattered to the upper part in the fluid chamber 5 are selectively used. The small-diameter heavy granule G2 can be kept in the fluidized bed F and can be classified substantially in the fluidized chamber 5, so that it is taken out from the fluidized chamber 5. In some cases, it is not necessary to classify the powder particles, and the classification mechanism 8A, shifter 8B, and crusher 8C may be unnecessary.

1 is a skeleton diagram showing a fluidized bed granulator / dryer which is an apparatus for producing small-diameter heavy granules of the present invention. FIG. It is a vertical side view which expands and shows a fluid chamber. It is a skeleton figure which shows the existing fluidized bed granulation dryer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluidized bed granulator / dryer 2 Fluidized air blowing chamber 2a Blowing port 3 Plate plate 5 Fluidizing chamber 5a Discharge port 5b Return port 6 Exhaust chamber 6a Exhaust port 6b Fan 6c Bag filter 7 Hot air supply device 71 Heat exchanger 72 Blower 73 Heat exchanger 8 Discharge device 8A Classification mechanism 8B Shifter 8C Crusher 9 Nozzle 9A Spout 10 Ejector 11 Introducing pipe 12 Blowing pipe 12a Discharge part C Coat layer E Fluidized bed formation region F Fluidized bed G0 Fine particles G1 Small diameter granules G2 Small diameter heavy Granule G3 Granulated product P Pump S1 Fluidized bed forming flow S2 Upstream air flow S3 Blowing flow S4 Inlet flow S5 Discharge flow L Raw material liquid M Spray droplet

Claims (6)

  The fluid air blowing chamber, the fluid chamber and the exhaust chamber are connected in the vertical direction, and a countersink is provided as a partition between the fluid air blowing chamber and the fluid chamber, and a nozzle for ejecting the raw material liquid is further provided in the fluid chamber. In the method of obtaining a granular material by fluid drying the raw material liquid supplied from the nozzle to the fluid chamber by hot air supplied from the fluid air blowing chamber to the fluid chamber, an ejector is provided in the fluid chamber. Furthermore, the nozzle is provided above the ejector, and the ejector ejects the fine particles and small-diameter granules in the flow chamber toward the nozzle, and the moving speed of the fine particles and small-diameter granules in the vicinity of the nozzle. By increasing the particle size, a coating layer of the raw material liquid is formed on the fine particles and the small-diameter granules, and adhesion between the fine particles and the small-diameter granules is suppressed. Method of manufacturing a heavy granules.   The ejector comprises an introduction pipe and a blow pipe for blowing hot air into the introduction pipe. By positioning the lower end portion of the introduction pipe above the fluidized bed forming region in the fluid chamber, fine particles and 2. The method for producing small-sized heavy granules according to claim 1, wherein only the small-sized granules are selectively led to a nozzle.   The amount of heat for drying the raw material liquid is increased by making the temperature of the hot air supplied to the blowing pipe in the ejector higher than the temperature of the hot air supplied from the flowing air blowing chamber to the fluidizing chamber. The manufacturing method of the small diameter heavy granule of Claim 2.   The fluid air blowing chamber, the fluid chamber and the exhaust chamber are connected in the vertical direction, and a countersink is provided as a partition between the fluid air blowing chamber and the fluid chamber, and a nozzle for ejecting the raw material liquid is further provided in the fluid chamber. In the apparatus for obtaining powder particles by fluid drying the raw material liquid supplied from the nozzle to the fluid chamber by hot air supplied from the fluid air blowing chamber to the fluid chamber, an ejector is provided in the fluid chamber, Further, a small diameter heavy granule producing apparatus, characterized in that the nozzle is provided above the ejector.   The ejector comprises an introduction pipe and a blow pipe for blowing hot air into the introduction pipe, and the lower end of the introduction pipe is positioned above the fluidized bed formation region in the fluid chamber. The apparatus for producing small-diameter heavy granules according to claim 4.   The temperature of the hot air supplied to the blowing pipe in the ejector is configured to be different from the temperature of the hot air supplied from the fluid wind blowing chamber to the fluid chamber. The manufacturing apparatus of the small diameter heavy granule as described.

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