JP2015014425A - Drying device and continuous granule manufacturing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air flow-type drying device in which drying treatment is possible with high performance without powdering granules, and the quality (particle size distribution and the yield) of dried granules obtained is high.SOLUTION: A drying device 1 is an air flow-type continuous drying device, and is configured by a granule loader 11, a drying unit 12 and a product ejecting unit 13. The granule loader 11 is formed with a stainless steel pipe 21, and has a granule loading port 22 for loading granules and a hot air blowing port 23 where a high-pressure hot blast is supplied. The drying unit 12 has a loop pipe 25 with stainless steel pipes wound therearound. The loop pipe 25 is horizontally installed along the horizontal direction. The product ejecting unit 13 includes a cyclone sampling machine 26, and the dried granules are recovered here through the loop pipe 25.

Description

  The present invention relates to an airflow-type drying apparatus for continuously drying powder particles, and more particularly to a drying apparatus suitable for a system for continuously producing granular powder particles used for pharmaceuticals.

  In the field of pharmaceuticals and the like, many are used that are obtained by drying a granulated wet granulated product produced by an extrusion granulator or a high-speed agitation granulator, or by tableting it. ing. Conventionally, a fluidized bed drying apparatus has been used for drying wet granulated materials, and the granulated products produced by the granulator are appropriately dried in a batch (batch) manner to produce desired granules. ing. However, since such a batch-type drying apparatus cannot perform continuous processing, an apparatus that continuously performs drying processing using a rotary feeder or the like as in Patent Documents 1 and 2 has also been proposed.

  Moreover, the spray dryer (spray drying apparatus) like patent document 3 is also used for manufacture of a granule. In a spray dryer, a slurry composed of a raw material powder, a solvent, a binder, and the like is sprayed by a spraying unit such as a nozzle or a rotating disk, and dried instantly with hot air to generate granules. On the other hand, for drying waste such as sludge and toner particles, a loop type airflow dryer as described in Patent Documents 4 to 6 is also used. In the airflow dryer, a granulated product is fed into a vertical loop tube together with a large amount of hot air, and the granulated product is circulated in the loop tube for drying.

Japanese Patent Laid-Open No. 58-72868 JP 61-3986 A JP 2011-33269 A JP 2010-266179 A JP 2000-290671 A JP 2000-304439 A WO2008 / 104923 WO2010 / 128359

  However, although the continuous fluidized bed drying apparatus as disclosed in Patent Documents 1 and 2 can be continuously processed, there is a problem that a drying time is long and a constant drying state is difficult to obtain. In addition, there is a problem in that the apparatus configuration becomes large and a large equipment cost is required. On the other hand, spray dryers are suitable for drying liquids that have fluidity as liquids, but are not suitable for drying solids and semisolids that have a low water content. Furthermore, since the loop type airflow dryer has a vertical arrangement with the loop tube in a vertical configuration, the workpieces accumulate on the lower part of the vertical part, and it is necessary to increase the air volume or increase the wind pressure. There was a problem that the granulated material was pulverized (returned to the original powder).

  An object of the present invention is an air-flow-type drying device that can be dried with high efficiency without pulverizing the granulated product, and that the quality (particle size distribution and yield) of the obtained dried granule is high. Is to provide.

  The drying device of the present invention is an airflow type drying device that dries a granulated material containing moisture with hot air, and is a granulated material inlet into which the granulated material is charged, and hot air to which the hot air is supplied. A granule charging unit provided with a blowing port; and a drying processing unit that is provided in communication with the granulated material charging unit at a subsequent stage of the granulated material charging unit, and the granulated product circulates with the hot air; A product discharge unit provided in communication with the drying processing unit at a subsequent stage of the drying processing unit, and the granulated material that has passed through the drying processing unit is discharged together with the hot air, and the drying processing unit, A processing tube having a curved portion formed by a tubular member is provided, and the processing tube is installed horizontally along the horizontal direction. In addition, the processing tube may be not only in a form in which it is rotated once or more in an annular shape, but also in a form of a part of a circle such as a quarter circle, a half circle, a quarter circle, etc. It does not have to make one revolution. Further, not only a circular shape but also a substantially L shape (elbow shape) in which a bent portion has an arc shape, a U shape, or an omega (Ω) loop shape may be used.

  Another drying device of the present invention is an airflow type drying device that dries a granulated material containing moisture with hot air, and is supplied with the granulated material inlet into which the granulated material is charged and the hot air. A granulated product input unit provided with a hot air blowing port, and a drying processing unit that is provided in communication with the granulated product input unit at a subsequent stage of the granulated product input unit, and in which the granulated product circulates with the hot air And a product discharge unit provided in communication with the drying processing unit at a subsequent stage of the drying processing unit, and the granulated material that has passed through the drying processing unit is discharged together with the hot air, and the drying processing unit Includes a processing tube having a curved portion formed by a tubular member, and the processing tube is installed at an inclination angle of 45 ° or less with respect to the horizontal direction.

  In the drying apparatus, the tubular member may be wound one or more times to form the treatment tube, or the treatment tube may be wound in a spiral shape like a mosquito coil. The processing tube may be divided into a plurality of processing tube units. In this case, the loop pipe unit is provided with a joint that can connect the loop pipe unit to another loop pipe unit in an airtight state, and the joint is joined in a state in which the loop pipe unit is rotatable. You may make it.

  Furthermore, the processing tube may be formed of a flat tube having a substantially elliptical cross section, or may be formed of a tubular member having a substantially triangular shape having a hypotenuse. In the latter case, a discharge port connected to the product discharge portion may be disposed above the slope portion. Further, a protrusion may be provided on the inner peripheral surface of the processing tube.

  On the other hand, the continuous granule production system of the present invention is a continuous granule production system provided with a drying device as described above, and the continuous granule production system comprises a powder mixing step, a powder kneading step, and wet granulation. It has a process, the drying process which consists of the said drying apparatus, and a granular material collection process, Each said process is connected in the said order.

  According to the drying apparatus of the present invention, in an airflow type drying apparatus that dries a granulated material containing moisture with hot air, a granulated material input unit having a granulated material input port and a hot air blowing port, and granulation A drying processing unit in which the product is circulated with hot air and a product discharge unit in which the granulated product is discharged with the hot air are provided, and a processing tube formed in an annular shape by a tubular member is provided in the drying processing unit along the horizontal direction. Therefore, the crushing ability can be suppressed while maintaining the high drying ability of the loop dryer. Therefore, it is possible to obtain high-quality dry granules with respect to particle size distribution, yield, etc. while realizing high-speed and efficient drying treatment.

  According to the continuous granule production system of the present invention, the drying apparatus of the present invention is used to perform the powder mixing process, the powder kneading process, the wet granulation process, the drying process, and the powder particle collecting process. Since it connects in order, it becomes possible to construct | assemble the continuous granule manufacturing system also including a drying apparatus.

It is explanatory drawing which shows the whole structure of the continuous granule manufacturing system in which the drying apparatus which is one embodiment of this invention is used. It is explanatory drawing which shows the structure of the drying apparatus which is one embodiment of this invention. It is explanatory drawing which shows the structure of a loop pipe | tube. It is explanatory drawing which shows the example of another loop pipe | tube. It is explanatory drawing which shows the example of another loop pipe | tube. It is explanatory drawing which shows the modification of the winding form of a loop pipe | tube. It is explanatory drawing which shows the modification which inclinedly arrange | positioned the loop pipe | tube.

  Embodiments of the present invention will be described below. FIG. 1 is an explanatory diagram showing an overall configuration of a continuous granule manufacturing system in which a drying apparatus 1 according to an embodiment of the present invention is used. As shown in FIG. 1, the continuous granule manufacturing system in which the drying apparatus 1 according to the present invention is used includes a wet granulation process and a drying process. Granules produced by the system are passed through a sieving and sizing process, then commercialized as granules, or tableted by a tableting machine and coated as appropriate by a coating machine, and then manufactured as tablets. It becomes.

  Various known wet granulators can be used in the wet granulation process. For example, the wet granulation process includes a high-speed agitation granulator 2 and an extrusion granulator 3, and a granulated product made in the wet granulation process. Is quantitatively supplied to the drying device 1 by the wet granulated material continuous supply device 5. The high-speed agitation granulator 2 has a specification that doubles as a powder mixing device and a powder kneading device. The raw material is put into a container, and the agitator and chopper are rotated at high speed to agitate the raw material. Knead. The extrusion granulator 3 is a wet granulator equipped with a screw shaft (for example, a two-axis parallel configuration), and compresses and kneads the raw material with a screw, and appropriately adds water to make the raw material into a columnar wet granulator. Grain.

  The above-described configurations of the high-speed stirring granulator 2 and the extrusion granulator 3 are merely examples, and these apparatuses are apparatuses other than the above as long as they have the functions of stirring, granulation, and sizing. However, it can be widely applied regardless of its configuration and operation mode. Furthermore, it is possible to add a granulator (not shown) according to the state of the granulated product and the product specifications, or to omit the wet granulated product continuous supply device 4.

  FIG. 2 is an explanatory diagram showing the configuration of the drying apparatus 1 shown in FIG. As shown in FIG. 1, the drying apparatus 1 is roughly composed of a granulated material input unit 11, a drying processing unit 12, and a product discharge unit 13. The drying device 1 is an airflow type continuous drying device, and conventionally has a configuration in which a loop pipe that has been vertically placed along the vertical direction is horizontally placed along the horizontal direction (in FIG. 1, drying is performed). The drying processing unit 12 of the apparatus 1 is shown as seen from above). Thus, while taking advantage of the high drying capacity of the conventional loop-type airflow dryer, the granulation capacity, which has been a major problem for granule production, is suppressed, and wet granulation is performed without using a large-scale apparatus. Realizes continuous drying of products.

  The granule input part 11 is formed of a stainless steel pipe 21 having an outer diameter of 50 mm and a wall thickness of about 2 to 3 mm. The stainless steel pipe 21 is provided with a granule inlet 22 into which a wet granulated material to be processed of the drying apparatus 1 is charged and a hot air inlet 23 to which high-pressure hot air (process gas) is supplied. Yes. A hopper 24 is attached to the granule inlet 22, and a wet granule is supplied from the granulator 4 described above. The hot air blowing port 23 is arranged in front of the granule input port 22 and is connected to the hot air supply device 14.

  The drying processing unit 12 is arranged at the subsequent stage of the granulated material input unit 11 and is formed by a metal (for example, stainless steel) loop tube (processing tube) 25. The loop tube 25 is a tubular member having an outer diameter of 75 mm and a wall thickness of about 2 to 3 mm with a circular cross section. One end side of the loop tube 25 is connected to the stainless steel tube 21, and the stainless steel tube 21 is attached to the other end portion in the same manner as the granulated material input unit 11. The diameter of the loop tube 25 is larger than that of the stainless steel tube 21 of the granule input part 11.

  The loop tube 25 is wound along the horizontal direction, and the winding diameter R (diameter of a circle passing through the loop tube center O) is about 700 mm. Here, the loop pipe 25 is arranged in a form in which two stages (two windings) are placed horizontally (side down), the first stage 25a of the loop pipe 25 is arranged horizontally, and the second stage 25b of the loop pipe 25 is arranged. The coil springs are arranged so as to wind up while being communicated with each other. Accordingly, when the loop pipes 25 are arranged in a plurality of stages, a gradient always occurs in the loop pipe 25, but the “horizontal arrangement” of the loop pipe 25 in the present invention eliminates such a gradient in the loop pipe. is not.

  FIG. 3 is an explanatory diagram showing the configuration of the loop tube 25. As shown in FIG. 3A, the loop tube 25 has a two-part structure for each stage, and is composed of a loop tube unit (processing tube unit) 31 (31a, 31b). Stainless steel connectors 32a and 32b are attached to the connecting portions of both units 31a and 31b. As shown in FIG. 3B, the connectors 32a and 32b are formed with spigot joints 33a and 33b, and both units 31a and 31b are in an airtight state with spigot joints or ferrule joints via the packing 34. Be joined.

  The loop tube 25 is rotatable about the central axis O in a state where the connectors 32a and 32b are joined. That is, the connectors 32a and 32b are joined so as to be rotatable with respect to each other along the circumferential direction. Therefore, for example, when the loop pipe 25 is provided as shown in FIG. 2, first, one end side (31b1) of the loop pipe unit 31b is connected to the straight pipe part 35a via the connector 32a. Next, one end side (31a1) of the loop pipe unit 31a is connected to the other end side (31b2) of the loop pipe unit 31b via the connectors 32b and 32a. At that time, the loop pipe unit 31b is rotated by a predetermined angle at the connectors 32a and 32b so that the other end side (31b2) of the loop pipe unit 31b is located below the one end side (31b1).

  After the loop pipe unit 31b is rotated by a predetermined angle, one end side (31a1) of the loop pipe unit 31a is connected to the other end side (31b2) to form the first stage 25a of the loop pipe 25. At this time, the other end side (31a2) of the loop pipe unit 31a, that is, the joint part of the loop pipe units 31b and 31a so that the end part of the first stage 25a of the loop pipe 25 is located below the straight pipe part 35a. (Connectors 32b and 33a) are appropriately rotated. After forming the first stage 25a of the loop pipe 25 in this way, the next loop pipe units 31b and 31a are connected while appropriately twisting the joint portions of the connectors 32a and 32b, and the second stage 25b of the loop pipe 25 is connected. Form. Then, the straight pipe part 35b is connected to the end of the second stage 25b via the connector 32b to form the loop pipe 25 having a two-stage configuration.

  Thus, in the drying apparatus 1 of the present invention, the next loop pipe unit 31 can be connected while rotating the joint portions of the connectors 32a and 32b. For this reason, the loop tube 25 can be easily stacked in a plurality of stages without twisting the main body 36 of the loop tube unit 31. Therefore, although the case where the loop tube 25 having a two-stage configuration is formed has been described here, the loop tube 25 having three or more stages can be easily formed by the same method.

  Further, by making the loop tube 25 such a divided structure, cleaning and visual confirmation inside the loop tube are facilitated. Further, since the structure is divided for each stage, the number of stacks of the loop pipe 25 can be arbitrarily set, and the configuration of the loop pipe 25 can be easily changed according to the specification of the granulated product. It is possible to do. Note that the number of divisions of the loop tube 25 is not limited to two. For example, a four-division structure is possible, and cleaning and visual confirmation are further facilitated by increasing the number of divisions.

  The product discharge unit 13 is disposed downstream of the drying processing unit 12 and includes a cyclone collector (powder body collection device) 26. The cyclone collector 26 is connected to the end of the loop tube 25 via a connection tube 27. The granulated product dried in the drying processing unit 12 is collected in the product collection tube of the cyclone collector 26. A sizing device (not shown) for performing a sieving / sizing process is connected to the subsequent stage of the cyclone collector 26.

  In such a drying apparatus 1, the granulated product is dried as follows. In the drying apparatus 1, first, a wet granulated product is supplied from the granulator 4 to the granulated product inlet 22. At that time, the inside of the stainless steel pipe 21 of the granulated material input unit 11 is at a negative pressure due to the suction force of the cyclone collector 26, and the granulated material charged into the hopper 24 from the granulator 4 is blown. It is introduced into the granule inlet 22 without going up. On the other hand, high-pressure hot air (for example, 90 ° C · 6 to 7 m / s) is supplied from the hot-air supply device 14 to the hot-air blowing port 23, and the granulated material supplied into the stainless steel pipe 21 is It is conveyed to the drying processing unit 12 side by hot air.

  As described above, the diameter of the loop pipe 25 is larger than that of the stainless steel pipe 21 of the granule input part 11. For this reason, the hot air supplied from the hot air blowing port 23 has a higher wind speed in the vicinity of the granule inlet 22 than in the loop tube 25. Therefore, in the granule input part 11, the granulated material supplied from the granule input port 22 does not stay near the granule input port 22 and smoothly enters the loop tube 25 from the stainless steel pipe 21. be introduced.

  The granulated material conveyed to the drying processing unit 12 side is circulated on the hot air in the loop tube 25 and dried. In the drying apparatus 1, the granulated product passes through the loop tube 25 in about 1 to 2 seconds. Then, the dried granulated product is discharged from the loop pipe 25 on hot air, and collected by the cyclone collector 26 via the connection pipe 27.

  Here, since the granulated product supplied to the drying apparatus 1 is in a sized state, it is not preferable to be pulverized in the drying apparatus 1. As described above, in the conventional loop-type airflow dryer, since the loop tube is vertically placed, it is necessary to lift the granulated material against gravity, and a large amount of air is required for the processing. In addition, the dried and lightened product is discharged out of the device, and the undried product is removed by gravity. The granulated product is circulated many times in the loop pipe under a large air volume. There was a tendency for the granulated material to be crushed repeatedly by dropping. This is due to the fact that conventional loop type airflow dryers are intended for granulated materials such as sludge and toner particles that allow or require crushing during drying, and avoid crushing during drying. The application to the desired granule was unexpected.

  On the other hand, in the drying apparatus 1 of the present invention, the granulated material flowing in the loop tube 25 is dried with hot air while receiving centrifugal force, but the amount of air supplied to the loop tube 25 is that of the granulated material. It is suppressed to the lower limit that does not stay in the tube. For this reason, unlike conventional vertical loop tubes, the granulated product is not subjected to a large impact due to a large air volume or gravity drop, and the wet granulated product is dried in a granular form without being crushed or powdered. Is done. According to the inventors' experiments, it was confirmed that the granulated material recovered after the treatment contained almost no fine powder, and the crushing ability was effectively reduced.

  Thus, according to the drying apparatus 1 of the present invention, it is possible to suppress the crushing ability while maintaining high drying ability by the loop dryer. Therefore, it is possible to obtain high-quality dry granules with respect to particle size distribution, yield, etc. while realizing high-speed and efficient drying treatment. Moreover, since the drying apparatus 1 has a configuration in which the loop tube 25 is wound, a space efficiency is high, and a compact and highly efficient drying apparatus can be provided. According to the inventors' experiment, when the loop tube 25 was straightened and dried with the same air volume, the granulated material stayed in the tube, and a large space was required. It turns out that the processing efficiency is not good.

  In addition, by combining the drying apparatus 1 with a continuous granulating apparatus, a tableting machine, a coating machine, etc., it is possible to construct a continuous granule manufacturing system including a drying step as shown in FIG. In addition, as mentioned above, the apparatus combined with the drying apparatus 1 such as a granulator, a tableting machine, and a coating machine in the sieving / sizing process, including the wet granulation process, depends on the processing mode of the granular material. The continuous granule production system according to the present invention can be appropriately selected and changed, and is not limited to the combination of the devices.

It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.
For example, in the above-described embodiment, the loop tube 25 has a two-divided structure, but the number of divisions is not limited to two. For example, a four-divided structure is also possible. Thus, cleaning and visual confirmation are further facilitated by increasing the number of divisions. Further, the various dimensions and specifications shown in the above-described embodiments such as the diameter, winding diameter, and number of steps of the loop tube 25 can be changed as appropriate, and the present invention is not limited to the dimensions and specifications.

  Furthermore, in the drying apparatus 1 described above, the drying process is performed in such a manner that the granulated material is fed from the upper side of the loop tube 25 and discharged from the lower side, but conversely, the feeding is performed from the lower side. However, it is also possible to adopt a processing mode of discharging from the upper stage side. The inclination angle between adjacent upper and lower stages of the loop tube 25 is about 10 °, and the required air volume is almost the same even when the granulated material is conveyed in a direction against gravity, such as from the lower stage side to the upper stage side, It did not affect the grinding ability of the granulated product. When the granulated material is fed from the lower side to the upper side in this way, the space efficiency is improved and the apparatus can be downsized.

  On the other hand, in the above-described embodiment, an example in which a tubular member having a circular cross section is used as the loop tube 25 is shown. However, as shown in FIG. 4A, the loop tube whose cross section is flattened to be elliptical. 41 may be used. Further, as shown in FIG. 4B, a loop tube 43 provided with a protrusion 42 on the inner surface may be used in order to improve the drying efficiency. However, in this case, if the protrusion 42 is large, the granulated product may collide with the pulverized product and be crushed.

  Furthermore, as shown in FIG. 5A, a loop tube 44 having a substantially triangular cross section may be used as the loop tube. In this case, as shown in FIG. 5B, the loop tube 44 has a single winding structure, and the granulated material that has flowed into the loop tube 44 circulates through the slope 45 on the inner periphery of the loop tube. At this time, since the granulated material containing moisture has a large mass, it flows in the lower part of the slope part 45 and flows in the upper part of the slope part 45 as it is dried and the amount of moisture decreases. A discharge port 46 is provided at an upper portion of the slope 45 of the loop tube 44, and the dried and light granulated material climbs the slope 45 and reaches the height of the discharge port 46. It is discharged outside. That is, the granulated product that has been dried is appropriately discharged from the discharge port 46.

  In addition, as a winding form of the loop tube, in addition to the laminated form as described above, a mosquito coil-like spiral winding form as shown in FIG. 6 is also possible (loop pipe 47). If it is set as a winding form like FIG. 6, the thickness of the up-down direction of a drying apparatus can be made small, and it becomes possible to make an apparatus compact. In this case, the granulated material may be supplied and discharged from either the inside or the outside.

  Further, in the above-described embodiment, the configuration in which the first stage (lowermost stage) of the loop tube 25 is horizontally placed is shown. However, as shown in FIG. 7, the loop tube 25 is inclined by an angle θ with respect to the horizontal plane. It is also possible. If the loop tube 25 is disposed at an angle, the area occupied by the loop tube is reduced accordingly, and the apparatus can be downsized. However, if the inclination angle θ is increased, the granulated material stays in the loop pipe unless an air volume larger than that at the time of horizontal (θ = 0 °) is supplied. On the other hand, when the air volume is increased, the rate at which the granulated material is pulverized in the loop pipe increases. According to the experiments by the inventors, θ should be up to about 45 ° in consideration of the drying ability and the pulverization rate. From the viewpoint of the drying treatment, the horizontal arrangement of θ = 0 is still preferable.

  The present invention is applicable not only to the drying treatment of wet granulated materials used in pharmaceuticals but also to the drying treatment of hydrous granulated materials used as raw materials for foods and fertilizers.

DESCRIPTION OF SYMBOLS 1 Drying apparatus 2 High speed stirring granulator 3 Extrusion granulator 4 Wet granulated material continuous supply apparatus 11 Granulated material input part 12 Drying process part 13 Product discharge part 14 Hot-air supply apparatus 21 Stainless steel pipe 22 Granule input 23 Hot air inlet 24 Hopper 25 Loop pipe (processing pipe)
25a First stage 25b Second stage 26 Cyclone collector (powder collector)
27 Connecting pipe 31 Loop pipe unit (processing pipe unit)
31a, 31a Loop pipe unit 31a1 Loop pipe unit one end side 31a2 Loop pipe unit other end side 31b1 Loop pipe unit one end side 31b2 Loop pipe unit other end side 32a, 32b Connector 33a, 33b Inner joint 34 Packing 35a, 35b Straight pipe part 36 Loop pipe unit main body 41 Loop pipe (processing pipe)
42 Protrusion 43 Loop tube (processing tube)
44 Loop tube (processing tube)
45 Slope 46 Discharge port 47 Loop pipe (processing pipe)
R Loop tube winding diameter θ Loop tube inclination angle

Claims (10)

An airflow type drying device for drying granulated material containing moisture with hot air,
A granule input unit comprising: a granule input port into which the granulated material is input; and a hot air blowing port to which the hot air is supplied;
A drying processing unit provided in communication with the granule input unit at a stage subsequent to the granule input unit, and the granulated product circulating with the hot air;
A product discharge unit provided in communication with the drying processing unit at a subsequent stage of the drying processing unit, and the granulated product that has passed through the drying processing unit is discharged together with the hot air;
The drying apparatus includes a processing tube having a curved portion formed by a tubular member, and the processing tube is installed horizontally along a horizontal direction. An airflow type drying device for drying granulated material containing moisture with hot air,
A granule input unit comprising: a granule input port into which the granulated material is input; and a hot air blowing port to which the hot air is supplied;
A drying processing unit provided in communication with the granule input unit at a stage subsequent to the granule input unit, and the granulated product circulating with the hot air;
A product discharge unit provided in communication with the drying processing unit at a subsequent stage of the drying processing unit, and the granulated product that has passed through the drying processing unit is discharged together with the hot air;
The drying processing section includes a processing tube formed by a tubular member and having a curved portion, and the processing tube is installed at an inclination angle of 45 ° or less with respect to the horizontal direction. Drying equipment.   3. The drying apparatus according to claim 1, wherein the processing tube is formed by winding the tubular member one or more times.   The drying apparatus according to any one of claims 1 to 3, wherein the processing tube is wound in a spiral shape.   The drying apparatus according to any one of claims 1 to 4, wherein the processing tube can be divided into a plurality of processing tube units.   6. The drying apparatus according to claim 5, wherein the loop pipe unit includes a joint portion that can connect the loop pipe unit to another loop pipe unit in an airtight state, and the loop pipe unit rotates. A drying apparatus characterized by being joined in a possible state.   The drying apparatus according to any one of claims 1 to 6, wherein the processing tube is formed by a flat tube having a substantially elliptical cross section.   7. The drying apparatus according to claim 1, wherein a cross section of the processing tube has a substantially triangular shape having a hypotenuse portion, and the product discharge portion is disposed above the slope portion. A drying apparatus comprising a discharge port to be connected.   The drying apparatus according to any one of claims 1 to 8, wherein the processing tube has a protrusion on an inner peripheral surface thereof. A continuous granule manufacturing system comprising the drying device according to any one of claims 1 to 9,
The continuous granule production system includes a powder mixing step, a powder kneading step, a wet granulation step, a drying step comprising the drying device, and a granular material collecting step, and the steps are in the order. A continuous granule production system, characterized in that it is connected by

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