Drying device

Abstract

To provide a drying device capable of uniformly and efficiently drying a material present in a storage tank.SOLUTION: There is provided a drying device comprising a storage tank 10 storing a material, a material supply means 12 connected to the upper part of the storage tank 10, and a material discharging means 14 connected to the lower part of the storage tank 10, to dry the material by sending hot air into the storage tank 10, i.e., a drying device 1 comprising a central hot air supply pipe 16 communicating with an upper hot air introduction port 22 disposed on the upper part of the side wall or on the upper wall of the storage tank 10, extended from the upper center across the lower center in the storage tank 10 and comprising a hot air supply port 24 in the lower center of the storage tank 10, a peripheral hot air passage 18 communicating with the lower hot air introduction port 28 disposed on the lower part of the side wall of the storage tank 10 to extend to the outer periphery of the storage tank 10 and comprising a hot air supply opening 30 attached to the lower part thereof, and an exhaust port 20 disposed on the upper part of the side wall or on the upper wall of the storage tank 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a drying device that dries materials in a storage tank that stores biomass materials and the like. [Background technology]

[0002] Conventionally, in biomass power generation facilities, before burning biomass materials stored in storage tanks, the biomass materials have been dried using a separate drying device to prevent a decrease in combustion efficiency (see Patent Document 1).

[0003] Furthermore, a drying device for drying biomass material in a storage tank may include, for example, a drying device for the supply machine that has a storage tank for storing raw materials and a supply machine connected to the lower part of the storage tank and that sends hot air into the storage tank to dry the raw materials, the drying device including a hot air introduction pipe connected to an outer wall below the middle part of the storage tank and communicating with the inside of the storage tank, a hot air supplying means that introduces hot air into the hot air introduction pipe, a hot air suction pipe connected to an outer wall near the upper end part above the middle part of the storage tank and communicating with the inside of the storage tank, and a hot air suction means connected to the hot air suction pipe. A drying device for a supply machine is known in which a bypass pipe is provided at a position below the connection position of the hot air inlet pipe to the outer wall, with one end connected to communicate with the inside of the supply machine and the other end connected to the outer wall at a position approximately at the same level as the connection position of the hot air suction pipe to the storage tank, and is configured so that the hot air introduced into the storage tank is discharged into the hot air suction pipe by the suction force of the hot air suction means, and the hot air introduced from one end into the bypass pipe is introduced from the other end into the storage tank and exhausted to the hot air suction pipe (see Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-291526 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-198434 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the drying device described in Patent Document 2, the supply of hot air was limited to the lower outer periphery of the storage tank, which resulted in uneven drying between the material on the outer periphery of the storage tank and the material in the center, and in some cases the entire material could not be dried sufficiently.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drying device that can dry materials in a storage tank uniformly and efficiently. [Means for solving the problem]

[0007] As a result of intensive research conducted by the inventor to solve the above problems, he discovered that by providing a central hot air supply pipe in the storage tank of a drying device that extends from the upper center to the lower center within the storage tank and has a hot air supply port in the lower center within the storage tank, and a peripheral hot air passage that extends to the outer periphery within the storage tank and has a hot air supply opening at its lower part, it is possible to suppress uneven drying between the material on the outer periphery and the material in the center of the storage tank, and to dry the entire material uniformly and efficiently, thereby completing the present invention.

[0008] That is, the present invention is as follows. [1] A drying device comprising a storage tank for storing a material, a material supply means for supplying the material to the storage tank, and a material discharge means for discharging the material from the storage tank, wherein hot air is blown into the storage tank to dry the material stored in the storage tank, a central hot air supply pipe that communicates with an upper hot air inlet provided on an upper side wall or upper wall of the storage tank, extends from the upper center to the lower center within the storage tank, and has a hot air supply port at the lower center within the storage tank; a peripheral hot air passage that communicates with a lower hot air inlet provided in a lower portion of the side wall of the storage tank, extends to an outer periphery of the storage tank, and has a hot air supply opening at its lower portion; an exhaust port provided in an upper portion of a side wall or an upper wall of the storage tank, for discharging hot air introduced into the storage tank; A drying device comprising: [2] The material supply means includes a material supply pipe that communicates with a material inlet provided on the upper wall of the storage tank, extends downward within the storage tank, and has a material supply port at an upper portion within the storage tank; a breathable filter that prevents the material from passing through is provided above the material supply port of the material supply pipe and below the exhaust port; The drying device according to [1] above, characterized in that the storage tank is divided into a material storage section below the breathable filter and a suction space section above the breathable filter. [3] The drying device according to [2] above, wherein the breathable filter is a crimped mesh. [Effects of the Invention]

[0009] The drying device of the present invention is capable of uniformly and efficiently drying the material in the storage tank. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a partially cross-sectional side view of a drying device according to an embodiment of the present invention, where A indicates a partial cross section near a hot air inlet of a peripheral hot air passage. [Figure 2] FIG. 2 is a plan view of the drying device shown in FIG. [Figure 3] 2A and 2B are enlarged views of the tip of the central hot air supply pipe of the drying device shown in FIG. 1, where (A) is a front view and (B) is a bottom view. The shaded area indicates the cutout portion. [Figure 4] 2 is an enlarged view of the vicinity of a hot air inlet of a peripheral hot air passage of the drying device shown in FIG. [Figure 5] FIG. 2 is an explanatory diagram of a material supply means of the drying device shown in FIG. [Figure 6] 6A and 6B are enlarged views of the tip of the material supply means shown in FIG. 5, where (A) is a front view and (B) is a perspective view. [Figure 7] FIG. 2 is an explanatory diagram of a breathable filter of the drying device shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] The drying apparatus of the present invention is a drying apparatus comprising a storage tank for storing materials, a material supply means for supplying materials to the storage tank, and a material discharge means for discharging materials from the storage tank, and which sends hot air into the storage tank to dry the materials stored in the storage tank, and is characterized by comprising: a central hot air supply pipe that communicates with an upper hot air inlet provided in the upper part of the side wall or the top wall of the storage tank, extends from the upper center of the storage tank to the lower center, and has a hot air supply port at the lower center of the storage tank; a peripheral hot air passage that communicates with a lower hot air inlet provided in the lower part of the side wall of the storage tank, extends to the outer periphery of the storage tank, and has a hot air supply opening at its lower part; and an exhaust port that is provided in the upper part of the side wall or the top wall of the storage tank and discharges the hot air introduced into the storage tank.

[0012] In the present invention, the upper part of the reservoir tank means the part above 1 / 2 of the height of the reservoir tank, preferably above 2 / 5, more preferably above 1 / 3, and the lower part of the reservoir tank means the part below 1 / 2 of the height of the reservoir tank, preferably below 2 / 5, more preferably below 1 / 3.

[0013] In conventional drying devices, the supply of hot air was limited to the lower, outer periphery of the storage tank, resulting in uneven drying between the materials in the outer periphery and the center of the storage tank, but this can be prevented.In other words, the drying device of the present invention supplies hot air to the lower center of the storage tank through the central hot air supply pipe, and hot air is supplied to the outer periphery of the storage tank through the peripheral hot air passage, thereby suppressing uneven drying between the materials in the outer periphery and the center of the storage tank, and allowing all of the materials in the storage tank to be dried uniformly and efficiently.

[0014] The material to be treated in the present invention (the material to be put into the storage tank) is not particularly limited, but a solid material is preferable, and as the solid material, woody biomass material used for biomass power generation is preferable. Examples of woody biomass material include wood chips, wood pellets, PKS (palm kernel shells), etc. The size of the woody biomass material is, for example, 100 to 100,000 mm 2 That's about it.

[0015] The drying device of the present invention can be used, for example, as a drying device or pre-drying device for woody biomass material in a biomass power generation facility.

[0016] The hot air introduced into the drying apparatus of the present invention can be, for example, air heated by a burner or exhaust gas discharged from a combustion furnace. When drying biomass materials, it is preferable to use exhaust gas generated from a combustion furnace for biomass power generation.

[0017] [Storage tank] The storage tank is a tank (container) for storing materials, and is usually elongated. The cross-sectional shape of the storage tank can be, for example, circular or polygonal, but a circular shape is preferred from the viewpoints of ease of supplying and discharging materials and ease of cleaning.

[0018] The size of the storage tank can be set appropriately depending on the size of the material, and for example, the diameter (diagonal in the case of a polygonal cross section) is about 1500 to 30,000 mm, preferably about 2000 to 15,000 mm, more preferably about 2500 to 10,000 mm, and even more preferably about 3,000 to 6,000 mm, and the height is about 3,000 to 40,000 mm, preferably about 4,000 to 20,000 mm, more preferably about 5,000 to 15,000 mm, and even more preferably about 6,000 to 10,000 mm.

[0019] (Material inlet) A material inlet for introducing material into the storage tank is provided on the upper wall of the storage tank, and material supply means is connected to the material inlet.

[0020] (Upper hot air inlet) The upper hot air inlet is an opening for introducing hot air into the storage tank, and is connected to the other end of a blower duct connected to an external hot air supply means and the inlet end of a central hot air supply pipe inside the storage tank, and is provided on the upper side wall or top wall of the storage tank.

[0021] (Lower hot air inlet) The lower hot air inlet is an opening for introducing hot air into the storage tank, and is provided in the lower part of the side wall of the storage tank. The other end of the air duct connected to the external hot air supply means is connected to the lower hot air inlet, and the inlet of the surrounding hot air passage inside the storage tank is connected to the lower hot air inlet. The air ducts connected to the upper hot air inlet and the lower hot air inlet may be branched air ducts connected to a common hot air supply means, or may be separate air ducts connected to separate hot air supply means.

[0022] (exhaust port) The exhaust port is an opening for exhausting the hot air introduced into the storage tank, and is provided in the upper part of the side wall or the top wall of the storage tank. The other end of the hot air suction pipe, which is connected to an external hot air suction means, is connected to the exhaust port.

[0023] [Material supply means] The material supply means is a means for supplying material into the storage tank, and specifically includes, for example, a material supply machine for supplying material and a material supply pipe connected to the material supply machine. The material supply pipe, for example, communicates with a material inlet provided on the upper wall of the storage tank, extends downward within the storage tank, and has a material supply port at the top of the storage tank.

[0024] Examples of material feeders include a feeder with an integrated agitator blade attached to the bottom of a hopper. The agitator blade at the bottom of the hopper rotates slowly, evenly feeding material from the center to the periphery and discharging a fixed amount from a discharge port on the bottom. Specific examples include a circle feeder (registered trademark) and a table feeder. Examples of such material feeders include the feeder described in JP 2017-198434 A (see FIG. 6).

[0025] It is preferable that multiple material supply pipes are arranged inside the storage tank, and it is preferable that multiple pipes are arranged evenly around the circumferential direction of the storage tank. This allows the material to be supplied uniformly into the storage tank. It is also preferable that the tip of the material supply pipe has a tapered shape (for example, a truncated cone shape). This prevents the material from stagnating. It is also more preferable that a tapered auxiliary chute (dispersion chute) with a slightly smaller diameter made of lattice-shaped rod members is provided below the tapered part of the tip of the material supply pipe (see Figure 6). The auxiliary chute has a lattice-shaped opening, which allows the material to be supplied into the storage tank in a more dispersed manner.

[0026] In addition, the material supply pipe is preferably provided with a rotary valve equipped with a photoelectric sensor that detects the presence or absence of material in the material supply pipe. When the supply amount of material in the storage tank is greater than the discharge amount, material accumulates in the material supply pipe extending downward from the upper wall of the storage tank. This is detected by the photoelectric sensor at a predetermined height and the rotary valve is closed. The rotary valve can also block the inflow of outside air. When the drying device is in use, the hot air suction means creates a negative pressure at the top to suck in hot air from below, making it easier for outside air to flow in. Therefore, closing the rotary valve prevents outside air from flowing in through the material supply pipe connected to the material supply machine.

[0027] [Material discharge means] The material discharge means is a means for discharging the material dried in the storage tank, and may be an exhaust duct or the like, but is preferably equipped with a discharger having a configuration similar to that of the material supply device of the material supply means.

[0028] [Central hot air supply pipe] The central hot air supply pipe is a passage for hot air introduced into the storage tank through the upper hot air inlet. It communicates with the upper hot air inlet provided on the upper side wall or top wall of the storage tank, extends from the upper center to the lower center of the storage tank, and has a hot air supply port in the lower center of the storage tank. This allows for efficient drying of materials near the center of the lower part of the storage tank and its surrounding area. The diameter of the central hot air supply pipe is approximately 300 to 1000 mm, preferably approximately 400 to 800 mm, and more preferably approximately 500 to 600 mm.

[0029] The tip of the central hot air supply pipe is preferably provided with multiple vertical slits spaced at predetermined intervals in the circumferential direction. This allows hot air to be supplied over a wider area, centered around the center. The slits may be tapered, for example, with a width increasing toward the tip (see FIG. 3). Alternatively, or in addition to the slits, multiple openings may be provided at the tip of the central hot air supply pipe.

[0030] [Ambient hot air passage] The surrounding hot air passage is a passage for hot air introduced into the storage tank through the lower hot air inlet. It communicates with the hot air inlet provided in the lower part of the side wall of the storage tank, extends to the outer periphery of the storage tank, and has a hot air supply opening below it. The hot air introduced from the lower hot air inlet spreads to the outer periphery of the storage tank through the surrounding hot air passage and is supplied into the storage tank through the lower hot air supply opening, thereby efficiently drying the material on the lower outer periphery of the storage tank. In addition, slits or openings may be provided in the inner wall surface of the surrounding hot air passage so that hot air can be supplied over a wider area (towards the center).

[0031] The surrounding hot air passage may be provided inside or outside the storage tank body. When the surrounding hot air passage is provided inside the storage tank body, the outer wall of the surrounding hot air passage may be common to the inner wall of the storage tank. When the surrounding hot air passage is provided outside the storage tank body, the inner wall of the surrounding hot air passage may be common to the outer wall of the storage tank. A specific embodiment of the surrounding hot air passage may be, for example, a hollow cylindrical or prismatic passage (e.g., a member with an inverted U-shaped cross section) whose inner and outer peripheral walls are concentrically arranged and which is closed at the top and open at the bottom.

[0032] [Breathable filter] The storage tank is preferably provided with a breathable filter to prevent the material from leaking out through the exhaust port. Specifically, a breathable filter is preferably provided above the material supply port of the material supply pipe and below the exhaust port of the storage tank, dividing the storage tank into a material storage section below the breathable filter and a suction space above the breathable filter. This prevents unintended material from leaking out through the exhaust port and reduces the burden of external exhaust processing (foreign matter removal processing). An example of a breathable filter is a crimped mesh. The effective opening area of ​​the breathable filter is preferably at least 5 times, and more preferably at least 10 times, the cross-sectional area of ​​the exhaust port.

[0033] Hereinafter, one embodiment of the drying device of the present invention will be specifically described with reference to the drawings, but the present invention is not limited to this embodiment.

[0034] FIG. 1 is a partially cross-sectional side view of a drying apparatus according to one embodiment of the present invention. A shows a partial cross section near the hot air inlet of the peripheral hot air passage. FIG. 2 is a plan view of the drying apparatus shown in FIG. 1. FIG. 3 is an enlarged view of the tip of the central hot air supply pipe of the drying apparatus shown in FIG. 1, where (A) shows a front view and (B) shows a bottom view. The shaded areas indicate cutouts. FIG. 4 is an enlarged view of the hot air inlet of the peripheral hot air passage of the drying apparatus shown in FIG. 1. FIG. 5 is an explanatory diagram of the material supply means of the drying apparatus shown in FIG. 1. FIG. 6 is an enlarged view of the tip of the material supply means shown in FIG. 5, where (A) shows a front view and (B) shows a perspective view. FIG. 7 is an explanatory diagram of the breathable filter of the drying apparatus shown in FIG. 1. The black arrows in FIGS. 1, 2, and 4 indicate the flow of hot air, and the white arrows in FIGS. 1, 5, and 6 indicate the flow of material.

[0035] As shown in Figures 1 and 2, a drying apparatus 1 according to one embodiment of the present invention comprises a storage tank 10 for storing material, a material supply means 12 for supplying material to the storage tank 10, a material discharge means 14 for discharging material from the storage tank 10, a central hot air supply pipe 16 that is connected to the upper side wall of the storage tank 10 and extends from the upper center to the lower center within the storage tank 10, a peripheral hot air passage 18 that is connected to the lower side wall of the storage tank 10 and extends to the outer periphery of the storage tank 10, and an exhaust port 20 that is provided in the upper side wall of the storage tank 10 and discharges hot air introduced into the storage tank 10.

[0036] As shown in FIGS. 1 and 2, the storage tank 10 stores 30 m of woody biomass material fed from the material supply means 12. 3 The container is a vertically long cylindrical container with a diameter of 3500 mm and a height of 4300 mm (excluding the height of the material supply means 12 and the material discharge means 14) that can hold approximately 1000g of material.

[0037] 1 and 2, storage tank 10 is provided with a central hot air supply pipe 16 and a peripheral hot air passage 18. Central hot air supply pipe 16 is connected to an upper hot air inlet 22 provided in the upper part of the side wall of storage tank 10, extends from the upper center to the lower center within storage tank 10, and has a hot air supply port 24 in the lower center within storage tank 10. This allows materials from the lower center of storage tank 10 to the surrounding area to be dried efficiently.

[0038] As shown in Figure 3, eight vertical slits 26 are provided at a predetermined interval in the circumferential direction at the tip of the central hot air supply pipe 16. The slits 26 are tapered, with the notch width at the base end being 40 mm and the notch width at the tip end being 50 mm. This allows the hot air blowing area to be larger than the cross-sectional area of ​​the pipe, and also enables blowing in the lateral direction, allowing for an effective supply of hot air.

[0039] As shown in FIG. 4, the surrounding hot air passage 18 is connected to a lower hot air inlet 28 provided in the lower part of the side wall of the storage tank 10, extends to the outer periphery of the storage tank 10, and has a hot air supply opening 30 at its lower part. In this embodiment, the surrounding hot air passage 18 is provided on the outside of the storage tank body. The surrounding hot air passage 18 is a hollow cylindrical passage with inner and outer periphery walls arranged concentrically, closed at the top and open at the bottom. The hot air introduced from the lower hot air inlet 28 spreads to the outer periphery of the storage tank 10 through the surrounding hot air passage 18 and is supplied into the storage tank 10 from the lower hot air supply opening 30, thereby efficiently drying the material at the lower periphery of the storage tank 10.

[0040] 1 and 2, an air duct 32 is connected to the outside of the storage tank 10 at the upper hot air inlet 22 to which the central hot air supply pipe 16 is connected, and a hot air supply means is connected to the air duct 32. Similarly, an air duct 34 is connected to the outside of the storage tank 10 at the lower hot air inlet 28, and a hot air supply means is connected to the air duct 34. An example of the hot air supply means is a blower that blows exhaust gas generated from a combustion furnace in biomass power generation.

[0041] As shown in Figure 5, material supply means 12 is a means for supplying material into storage tank 10, and is connected to a material inlet 36 provided at the top of storage tank 10 for introducing material into storage tank 10. Material supply means 12 includes a material supply machine 38 provided at the top of storage tank 10 for supplying material, and four material supply pipes 40 connected to material supply machine 38. Material supply pipes 40 are evenly arranged around the circumference of storage tank 10 (see Figure 2), and supply material evenly into storage tank 10.

[0042] Each material supply pipe 40 is provided with a rotary valve 42 equipped with a photoelectric sensor that detects the presence or absence of material in the material supply pipe 40. As a result, in the event of an excess supply of material, material will accumulate in the material supply pipe 40, and the photoelectric sensor will detect this at a predetermined height and close the rotary valve 42. Also, by closing the rotary valve 42, it is possible to block the inflow of outside air from the material supply pipe 40 connected to the material supplier 38.

[0043] As shown in Figure 6, the material supply pipe 40 is formed into a truncated cone shape with a tapered tip, allowing the material to be supplied over a wide area. Below the tapered part at the tip of the material supply pipe 40, a tapered auxiliary chute 44 with a slightly smaller diameter, made up of lattice-like rod members, is provided. The auxiliary chute 44 has lattice-like openings, allowing the material to be supplied into the storage tank 10 in a more dispersed manner.

[0044] The material feeder 38 of the material supply means 12 is a feeder with an integrated agitator blade attached to the bottom of the hopper. The agitator blade at the bottom of the hopper rotates slowly, evenly feeding the material from the center to the periphery, and then discharging the material at a fixed amount from a discharge port provided on the bottom. This prevents bridging and segregation of the material, allowing for a stable, fixed supply of the material. A suitable example of the material feeder 38 is CIRCLE FEEDER (registered trademark, manufactured by Yoshikawa Corporation).

[0045] 1, material discharge means 14 is a means for discharging the material dried in storage tank 10, and is connected to the bottom of storage tank 10. Material discharge means 14 is equipped with a discharger having a configuration similar to material supply device 38 of material supply means 12. Material discharge means 14 is provided with a hot air inlet, allowing hot air to be supplied from the outside.

[0046] 1 and 2, the hot air introduced into the storage tank 10 is discharged from exhaust ports 20 (20a, 20b) provided in the upper part of the side wall of the storage tank 10. Hot air suction pipes 48a, 48b are connected to the exhaust ports 20a, 20b, and hot air suction means 46 is connected to the hot air suction pipes 48a, 48b.

[0047] As shown in FIG. 1, the storage tank 10 is provided with a crimped mesh 50 as a breathable filter that prevents the outflow of material from the exhaust port 20. The crimped mesh 50 is provided above the material supply port 52 of the material supply pipe 40 and below the exhaust port 20, and divides the interior of the storage tank 10 into a material storage section 54 below the crimped mesh 50 and a suction space section 56 above the crimped mesh 50. As shown in FIG. 7, the crimped mesh 50 has a mesh size of approximately 7 mm to 10 mm. This prevents the unintended outflow of material from the exhaust port 20 and reduces the burden of external exhaust processing.

[0048] The operation (method of use) of the drying device 1 will now be described. First, material is continuously supplied into storage tank 10 at a predetermined mass flow rate by material supply means 12. Inside storage tank 10, hot air introduced from central hot air supply pipe 16 and peripheral hot air passage 18 rises to suction space 56 while drying the material in material storage section 54, and is then discharged from exhaust port 20 by suction using hot air suction means 46. As a result, moisture contained in the material is released to the outside along with the hot air, and the dried material is discharged. The dried material is also continuously discharged by material discharge means 14.

[0049] In the drying device 1 according to one embodiment of the present invention, hot air is supplied to the lower central part of the storage tank 10 by the central hot air supply pipe 16, and hot air is supplied to the outer peripheral part of the storage tank 10 by the peripheral hot air passage 18, thereby suppressing uneven drying between the material on the outer periphery of the storage tank 10 and the material in the center, and enabling all of the material in the storage tank 10 to be dried uniformly and efficiently. [Industrial Applicability]

[0050] The drying device of the present invention can be used as a drying device for woody biomass material in biomass power generation facilities, and is therefore industrially useful. [Explanation of symbols]

[0051] 1 Drying device (first embodiment) 10 Reservoir 12 Material supply means 14 Material discharge means 16 Central hot air supply pipe 18 Surrounding hot air passage 20 exhaust port 22 Upper hot air inlet 24 Hot air supply port 26 Slit 28 Lower hot air inlet 30 Hot air supply opening 32 Ventilation duct 34 Ventilation duct 36 Material inlet 38 Material feeding machine 40 Material supply pipe 42 Rotary Valve 44 Support Chute 46 Hot air suction means 48 Hot air suction pipe 50 Crimp Mesh 52 Material supply port 54 Material storage section 56 Suction space

Claims

1. A drying device comprising: a storage tank for storing a material; a material supplying means for supplying the material to the storage tank; and a material discharging means for discharging the material from the storage tank, wherein hot air is blown into the storage tank to dry the material stored in the storage tank, a central hot air supply pipe that communicates with an upper hot air inlet provided on an upper side wall or upper wall of the storage tank, extends from the upper center to the lower center within the storage tank, and has a hot air supply port at the lower center within the storage tank; a peripheral hot air passage that communicates with a lower hot air inlet provided in a lower portion of the side wall of the storage tank, extends to an outer periphery of the storage tank, and has a hot air supply opening at its lower portion; an exhaust port provided in an upper portion of a side wall or an upper wall of the storage tank, for discharging hot air introduced into the storage tank; A drying device comprising:

2. the material supply means includes a material supply pipe that communicates with a material inlet provided in an upper wall of the storage tank, extends downward within the storage tank, and has a material supply port at an upper portion within the storage tank; a breathable filter that prevents the material from passing through is provided above the material supply port of the material supply pipe and below the exhaust port; 2. The drying device according to claim 1, wherein the storage tank is divided into a material storage section below the breathable filter and a suction space above the breathable filter.

3. 3. The drying device according to claim 2, wherein the breathable filter is a crimped mesh.

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