Method and apparatus for producing solid fuel

Abstract

To provide a method and apparatus for producing solid fuel that does not require pulverization of raw materials for solid fuel, has fewer treatment processes such as separate collection of raw materials for solid fuel, and uses uniform raw materials to achieve a constant calorific value.SOLUTION: A method for producing solid fuel 22 uses a solid matter 3 as a raw material after decomposition treatment, wherein the method uses a used paper diaper processing apparatus 2 that decomposes used paper diapers by agitating them with a processing liquid along with the materials constituting the paper diapers, the method comprising: removing the solid matter 3 from the used paper diaper processing apparatus 2; storing the removed solid matter 3 in a solid matter accumulation storage part 4; removing a specified quantity of the solid matter 3 stored in the solid matter accumulation storage part 4; supplying the specified quantity of solid matter 3 removed from the solid matter accumulation storage part 4 to a compression molding part 5; and compressing and heating the specified quantity of solid matter 3 supplied to the compression molding part 5.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method and an apparatus for producing solid fuel from recovered material collected from used disposable diapers. [Background technology]

[0002] Producing waste-derived fuel (hereinafter referred to as "solid fuel") using waste materials such as waste paper and discarded plastic as raw materials has been proposed in Patent Documents 1, 2 and 3. This solid fuel is made from reduced-volume materials that have been crushed or otherwise processed to reduce the volume of various types of food waste, such as cooking scraps and leftover food, various types of plastic waste, such as plastic bags and foam trays, and general waste, such as paper bags, paper cartons, cardboard, newspapers and disposable diapers, generated from households.

[0003] In Patent Document 1, raw materials are used that are made by efficiently mixing and pulverizing and fragmenting food waste, plastic waste such as plastic products, and paper waste such as cardboard and newspapers together in a treatment tank equipped with a mixer, and that the raw materials are subjected to a volume reduction and elimination treatment by the decomposition action of microorganisms in the treatment tank.The raw materials are then compressed by a pressurizing means to produce a compressed material, and the compressed material is melted and solidified by an extrusion means while being heated, and molded to produce a solid fuel.

[0004] In Patent Document 2, waste plastics and burnable waste are separated from municipal waste, industrial waste, etc., and the waste plastics and recovered paper are fed to a crusher in a predetermined ratio to be crushed, and the crushed mixture and the burnable waste are carbonized to obtain a carbonized material, which is then compressed and molded to produce solid fuel.

[0005] In Patent Document 3, powdered waste plastics and powdered coal ash are used as the main raw materials, which are continuously mixed and compressed using a single- or twin-screw extruder, and then continuously extruded from a die with a large number of specified holes at the tip to produce solid fuel. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2010-121046 A [Patent Document 2] Patent No. 4097618 [Patent Document 3] Patent No. 3139265 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in Patent Documents 1, 2, and 3, the waste plastics used as raw materials to produce solid fuel contain a mixture of various plastics such as polyethylene and polyvinyl chloride. Therefore, when solid fuel produced using these plastics as raw materials is burned, there is a problem that the calorific value of each type of plastic differs, resulting in variation in the calorific value of solid fuel produced using these multiple types of plastics as raw materials.

[0008] Furthermore, in Patent Documents 1, 2, and 3, for example, containers of shampoo or the like must be crushed to break them into small pieces. In particular, in Patent Document 3, granular waste plastic and powdered coal are used as raw materials, so the waste plastic must be crushed. For this reason, very small pieces of plastic (microplastics) are generated when the containers are crushed. When molding solid fuel, these microplastics are too fine to be molded into solid fuel, and are ultimately disposed of in sewers, etc. This causes the problem that microplastics are released into the natural world, causing adverse effects on the natural environment.

[0009] In addition, collecting large amounts of waste plastic to be used as solid fuel requires a number of pre-processing steps, such as separating the plastic and removing labels, caps, and other foreign objects attached to the plastic.

[0010] Therefore, an object of the present invention is to provide a method and apparatus for producing solid fuel which does not require pulverizing the raw materials for solid fuel, has fewer processing steps such as separate collection of the raw materials for solid fuel, and can obtain a consistent calorific value using homogeneous raw materials. [Means for solving the problem]

[0011] In order to solve the above-mentioned problems and achieve the object, a first aspect of the present invention is a method for producing solid fuel in a used paper diaper treatment device that decomposes used paper diapers by mixing the materials that make up the paper diapers with a treatment liquid, and using the solids after the decomposition process as raw material to produce solid fuel, characterized in that the solids are removed from the used paper diaper treatment device and stored in a solid accumulation storage section, a predetermined amount of the solids stored in the solid accumulation storage section is removed, the predetermined amount of the solids removed from the solid accumulation storage section is supplied to a compression molding section, and the predetermined amount of the solids supplied to the compression molding section is compressed and heated to produce solid fuel.

[0012] A second aspect of the present invention is characterized in that the compression molding section compression molds a predetermined amount of the solid material supplied to the solid material supply section, and then stores the compressed solid material in the solid fuel storage section by an ejection mechanism.

[0013] In a third aspect of the present invention, the solid material is a plastic pulp-containing solid component obtained after the used paper diaper is decomposed.

[0014] A fourth aspect of the present invention is a used paper diaper treatment device that mixes used paper diapers with a treatment liquid to decompose the materials that make up the paper diapers, and a solid fuel manufacturing device that produces solid fuel using the solid matter after the decomposition process as a raw material, characterized in that it comprises a solid matter accumulation and storage section that stores the solid matter removed from the used paper diaper treatment device, a compression molding section that compresses and heats a predetermined amount of the solid matter supplied from the solid matter accumulation and storage section to produce solid fuel, and a solid fuel storage section that stores the solid fuel produced by compression molding in the compression molding section.

[0015] In a fifth aspect of the present invention, the solid material is a plastic pulp-containing solid component obtained after decomposition of used paper diapers. Effect of the Invention

[0016] According to the present invention, since only solid matter remaining after decomposition processing of used paper diapers is used as a raw material, solid fuel can be produced from a uniform raw material. Also, by producing solid fuel from a uniform raw material, it is possible to produce solid fuel with a constant calorific value. Furthermore, according to the present invention, since solid matter remaining after decomposition processing of used paper diapers is compression molded as it is without being crushed or pulverized, no microplastics are produced and are not released into the natural world, so there is no harm to the natural environment. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is an explanatory diagram showing an overview of a solid fuel production apparatus according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing a solid fuel production apparatus according to an embodiment of the present invention. [Diagram 3] FIG. 3 shows the compression molding section of a solid fuel manufacturing apparatus according to an embodiment of the present invention, where (a) is a cross-sectional view showing the state before compressing the plastic pellets, (b) is a cross-sectional view showing the state in which the plastic pellets are compressed to produce solid fuel, and (c) is a cross-sectional view showing the state in which the solid fuel has been compressed and molded. [Figure 4] Figure 4 shows the compression molding section of a solid fuel manufacturing apparatus according to an embodiment of the present invention, where (a) is a cross-sectional view showing the state before compressing the plastic pellets, and (b) is a cross-sectional view showing the state in which the plastic pellets are compressed to produce solid fuel. [Diagram 5]Figure 5 shows a compression molding section of a solid fuel manufacturing apparatus of an embodiment of the present invention, where (a) is a cross-sectional view showing a state in which the removal mechanism pushes out the compression-molded solid fuel into the solid fuel holding section, and (b) is a cross-sectional view showing a state in which the removal mechanism pushes out the compression-molded solid fuel into the solid fuel holding section and pushes out the solid fuel that has already been removed from the solid fuel holding section from the solid fuel holding section. [Figure 6] FIG. 6 shows the shapes of the solid fuel in this embodiment, where (a) is a perspective view showing a cylindrical solid fuel, (b) is a perspective view showing a rectangular solid fuel, and (c) is a perspective view showing a flat plate-shaped solid fuel. [Figure 7] FIG. 7 is a block diagram showing an outline of a diaper station in which a solid fuel production apparatus according to an embodiment of the present invention is used. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The following describes an embodiment of a manufacturing method and manufacturing device for solid fuel according to the present invention. The manufacturing method for solid fuel according to the present embodiment is a processing device for used disposable diapers that mixes materials constituting the disposable diapers with a processing liquid to decompose the materials, and produces solid fuel using the plastic-pal, which is a solid material after the decomposition process and has pulp attached to it, as a raw material.

[0019] As shown in Figure 1, PlaPal 3, which is plastic that is a solid after decomposition processing in the used paper diaper processing device 2 and has pulp attached to it, is removed from the used paper diaper processing device 2 and stored in the PlaPal accumulation and storage section 4. A predetermined amount of the PlaPal 3 stored in the PlaPal accumulation and storage section 4 is removed, and the predetermined amount of the PlaPal 3 removed from the PlaPal accumulation and storage section 4 is supplied to a compression molding section 5. The predetermined amount of the PlaPal 3 supplied to the compression molding section 5 is compressed and heated to produce solid fuel 22 (not shown in Figure 1).

[0020] The compression molding unit 5 compresses and molds a predetermined amount of the plastic pulp 3 supplied to the plastic pulp supply unit 14, and then stores the compressed amount in the solid fuel storage unit 6 by the take-out mechanism 16. Furthermore, the waste liquid after the decomposition processing of used paper diapers is discharged from the used paper diaper processing device 2 and sent to the pulp recovery device 7, where the pulp mixed in the waste liquid is recovered, and the liquid after the pulp is recovered is sent to the waste liquid processing unit 11 for waste liquid treatment.

[0021] The solid fuel produced by the method for producing solid fuel in this embodiment is a Refuse Derived Fuel (RDF) made from combustible materials such as plastics and pulp extracted by decomposing and processing used paper diapers, which are general waste, and plastics and papers extracted from general waste such as household garbage, and is a Refuse Paper & Plastic Fuel (RPF) made from plastics, pulp, etc. extracted only from used paper diapers, whose generation history is clear. The higher heating value of the solid fuel produced by the method for producing solid fuel in this embodiment is 19.9 to 23.1 MJ / Kg (4740 to 5500 Kcal / Kg).

[0022] Next, a solid fuel manufacturing device 1 according to an embodiment of the present invention will be described. As shown in Fig. 1, the solid fuel manufacturing device 1 of this embodiment includes a plastic pallet accumulation / storage section 4 that accumulates plastic pallets 3 taken out from a used paper diaper processing device 2, a compression molding section 5 that compresses and heats a predetermined amount of plastic pallets 3 supplied from the plastic pallet accumulation / storage section 4 to manufacture solid fuel, and a solid fuel storage section 6 that accumulates the solid fuel manufactured by compression molding in the compression molding section 5.

[0023] The used paper diaper treatment device 2 includes an outer body separation tank fixed to a housing, an inner body separation tank rotatably provided within the outer body separation tank into which used paper diapers are placed, a drive unit that rotates the inner body separation tank within the outer body separation tank, and a treatment liquid supply unit that supplies treatment liquid for decomposing used paper diapers into the inner body separation tank. The treatment liquid used in this used paper diaper treatment device 2 is a mixture of water, disinfectant, lime, and detergent in a predetermined ratio.

[0024] Used paper diapers are then placed in the inner body separation tank, and as the inner body separation tank rotates with the treatment liquid being supplied, the used paper diapers are agitated together with the treatment liquid and decomposed. The used paper diapers agitated together with the treatment liquid in the inner body separation tank are decomposed into the materials that make up the used paper diapers, pulp, plastic, and others. When the used paper diapers are decomposed in the inner body separation tank, the effluent containing pulp is sent to a pulp recovery device 7, where pulp is recovered from the effluent. After the pulp has been recovered from the effluent, the effluent is sent to an effluent treatment unit 11 and treated. In the inner body separation tank, plastic-based plastic, which is a solid component, and a small amount of pulp attached thereto, remains, and this plastic-based plastic 3 is sent to the plastic-based accumulation and storage unit 4 by a transport belt conveyor 8.

[0025] An agitator 9 is provided in the Plapal accumulation storage section 4, and agitates the Plapal 3 sent from the inner body separation tank of the used paper diaper processing device 2. This agitation does not crush or pulverize the plastics, but mixes them so that they do not accumulate unevenly. In other words, the plastics used in used paper diapers are a mixture of large and small pieces, and this prevents the large pieces from clumping together and the small pieces from clumping together and hardening, so that the large and small pieces are mixed together in a uniform state.

[0026] The size of the plastic contained in a disposable diaper is 49 to 60 cm for the type that is fastened on both sides with tape, 45.5 to 60 cm for pants-type, and 70 to 85 cm for other types that have elastic tape fastenings to fit snugly, and the size of the plastic used in disposable diapers is 30 cm at minimum and 85 cm at maximum. The plastic diapers in this state are supplied to the compression molding section 5 by the transport belt conveyor 10.

[0027] In addition, since the size of the plastic contained in a disposable diaper varies from 30 to 85 cm, in order to make the size of this plastic approximately uniform, the plastic may be roughly cut into pieces of about 3 to 5 cm using a cutting blade before storing the plastic in the plastic accumulation / storage section 4. In this case, the plastic with the attached plastic is not finely crushed or pulverized using a cutting means (not shown), but is roughly cut into pieces of a uniform size. Therefore, small pieces of plastic such as microplastics are not generated.

[0028] As shown in Figs. 2, 3, 4, and 5, the compression molding section 5 is formed of a lower mold 12, an upper mold 13, a plastic pallet supply section 14 provided between the lower mold 12 and the upper mold 13, a compression drive section 15 that moves the upper mold 13 toward the lower mold 12 to compress the plastic pallet between the upper mold 13 and the lower mold 12, and a removal mechanism 16 that removes the compressed plastic pallet from the compression molding section 5. The lower mold 12 is provided with a semi-cylindrical groove 17, and the upper mold 13 is formed in a semi-cylindrical shape. The upper mold 13 is lowered toward the lower mold 12 by the compression drive section 15 and rises from the lower mold 12. Then, when the upper mold 13 and the lower mold 12 are combined, a cylindrical cavity 18 is formed inside, and the plastic pallet supplied to the plastic pallet supply section 14 is compressed and molded into a cylindrical shape within this cavity 18.

[0029] The Plapal supply section 14 is located above the lower mold 12 and is formed around the groove 17, with a hopper 19 provided at the upper opening. A predetermined amount of stirred Plapal 3 from the Plapal accumulation storage section 4 is transported to the hopper 19 by the transport belt conveyor 10 and supplied into the Plapal supply section 14. The volume of this Plapal supply section 14 is set to a value that will supply the amount of Plapal necessary to produce solid fuel that will produce a certain amount of heat when burned.

[0030] Additionally, the upper die 13 and the lower die 12 are each provided with a heating means 20 for heating the plastic pallets 3 when the plastic pallets 3 are compression molded. The heating means melts the plastic when a predetermined amount of the plastic pallets is compression molded between the upper die 13 and the lower die 12, and the cylindrical solid fuel 22 is formed. The heating temperature in this case is set to 130 to 200°C. When a predetermined amount of the plastic pallets 3 supplied to the plastic pallet supply section 14 is compressed and molded while being heated by the upper die 13 and the lower die 12 to produce solid fuel, the plastic pallets 3 are transported from the compression molding section 5 to the solid fuel storage section 6 by the removal mechanism 16.

[0031] 4 and 5, the removal mechanism 16 is formed of an extrusion piston 21 provided on the rear side of the lower mold 12, and a solid fuel holding section 23 into which the solid fuel 22 compressed and molded into a cylindrical shape is extruded by the extrusion piston 21. When the solid fuel 22 compressed and molded into a cylindrical shape in the cylindrical groove 17 is extruded by the extrusion piston 21, the solid fuel 22 that has already been compressed and molded and is located in the solid fuel holding section 23 is extruded from the solid fuel holding section 23. The solid fuel 22 extruded from the solid fuel holding section 23 is stored in the solid fuel storage section 6.

[0032] In this embodiment, the cylindrical solid fuel 22 has been described as an example, but the shape of the solid fuel may be a rectangular solid fuel 24 as shown in FIG. 6(b) or a flat solid fuel 25 as shown in FIG. 6(c). The flat solid fuel 25 may be provided with a V-shaped groove 26 so that it can be easily broken and divided as necessary. When manufacturing the rectangular solid fuel 24, the cavity formed inside the lower mold 12 and the upper mold 13 when they are joined together is made to be rectangular. The flat solid fuel 25 is also made to have a flat cavity formed inside the lower mold 12 and the upper mold 13 when they are joined together.

[0033] Next, a procedure for producing solid fuel 22 using the PlaPal 3 after used paper diapers have been treated will be described. Used paper diapers collected and accumulated from hospitals, nursing facilities, general households, etc. are placed in the inner body separation tank of the used paper diaper treatment device 2, and the inner body separation tank is rotated and agitated while a treatment liquid is supplied to decompose the used paper diapers. The used paper diapers agitated together with the treatment liquid in the inner body separation tank are decomposed into materials constituting the used paper diapers, pulp, plastic, and others. When the used paper diapers are decomposed in the inner body separation tank, the effluent containing pulp is sent to a pulp recovery device 7, where pulp is recovered from the effluent. The effluent after the pulp is recovered from the effluent is sent to an effluent treatment unit 11 for effluent treatment.

[0034] The solid components remaining in the inner body separation tank, such as plastic, plastic with a small amount of pulp attached, and other components (rubber, etc.), are stored in the PlaPal accumulation and storage section 4 by the transport belt conveyor 8. In this case, since the majority of the solid components in the inner body separation tank are PlaPal 3, the following explanation will be given assuming that solid fuel is produced from the PlaPal 3. The PlaPal accumulated in the PlaPal accumulation and storage section 4 is agitated by an agitator 9 to mix up the different sizes of PlaPal. This prevents large and small PlaPal from being biased, and results in a state in which the different sizes of PlaPal are mixed evenly overall.

[0035] As shown in Figures 3(a) and 4(a), the mixed Pla-Pal 3 in the Pla-Pal accumulation storage section 4 is led by the transport belt conveyor 10 to the hopper 19 of the compression molding section 5, where a predetermined amount is supplied to the Pla-Pal supply section 14. Next, as shown in Figures 3(b) and 4(b), the upper die 13 descends to press the Pla-Pal 3 supplied to the Pla-Pal supply section 14 against the lower die 12, compressing it. As a result, a cylindrical solid fuel 22 is molded between the upper die 13 and the lower die 12.

[0036] When the plastic pulp 3 is compressed between the upper die 13 and the lower die 12, the plastic pulp 3 is heated by the heating means 20 of the upper die 13 and the lower die 12. This heating melts the plastics mixed in the plastic pulp 3, and the plastic is compressed together with the mixed pulp to form a cylindrical solid fuel shape. In this case, the plastic pulp 3 is agitated by the agitator 9 of the plastic pulp accumulation storage section 4, so that the plastic pulp 3 is heated and compressed in an evenly mixed state without any uneven distribution of large and small plastics, forming the solid fuel 22.

[0037] When the solid fuel 22 is molded by being heated and compressed between the upper mold 13 and the lower mold 12, as shown in Figures 3(c) and 5(a), the upper mold 13 rises and the ejection piston 21 of the removal mechanism 16 pushes the compressed solid fuel 22 from the cavity 18 between the upper mold 13 and the lower mold 12 towards the solid fuel holding section 23 as shown in Figure 5(b). As a result, the solid fuel previously pushed towards the solid fuel holding section 23 is pushed out of the solid fuel holding section 23 and stored in the solid fuel storage section 6.

[0038] According to this embodiment, the solid fuel 22 can be produced from a uniform raw material, since only Plapal, which is a solid component remaining after the decomposition process of used paper diapers, is used as the raw material. Also, by producing the solid fuel 22 from a uniform raw material, it becomes possible to produce the solid fuel 22 having a constant calorific value. Furthermore, according to this embodiment, the solid fuel 22 is produced by compressing and molding Plapal 3, which is a solid component remaining after the decomposition process of used paper diapers, as it is, without crushing or pulverizing, so that no microplastics are produced and are not released into the natural world, thereby not harming the natural environment.

[0039] In the above embodiment, an example was shown in which PlaPal, which is plastic that is a solid material remaining after the decomposition process of used paper diapers and has pulp attached thereto, was used as the raw material for solid fuel. However, in addition to the PlaPal remaining after the decomposition process of used paper diapers, pulp (solid component) recovered from the wastewater remaining after the decomposition process of used paper diapers may also be added to the PlaPal and used as the raw material for solid fuel.

[0040] In addition, in this embodiment, the solid fuels 22, 24, and 25 can be set to any size, and may have a shape and size that matches the boiler that burns the solid fuels 22, 24, and 25. Furthermore, the calorific value does not need to conform to the standards of RDF and RPF.

[0041] Next, an example of using the solid fuel manufacturing method and manufacturing device according to the embodiment of the present invention will be described. As shown in Fig. 7, in this embodiment, the solid fuel manufacturing device 1 is installed in a diaper station 27 which is provided in a predetermined site such as a site along a road, a service area on a highway, the site of a large hospital, or the site of an emergency evacuation site of each local government, and where used diapers are brought by individuals.

[0042] 7, the diaper station 27 is provided with the used paper diaper treatment device 2 of the above embodiment, a pulp recovery device 7, and a waste liquid treatment device 11. The solid fuel production device 1 is provided within a site 28 of the diaper station 27, and is provided with a plastic pulp accumulation and storage section 4, a compression molding section 5, and a solid fuel storage section 6.

[0043] Furthermore, within the site 28 of the diaper station 27, there is a boiler 29 that generates steam using the solid fuel 22 produced by the solid fuel production device 1 as fuel, and Steamed The site 28 is equipped with a generator 30 that generates electricity by rotating a turbine with wind, and an electricity storage device 31 that stores the electricity generated by the generator 30. In addition, a well 32 and a rainwater tank 33 are installed within the site 28.

[0044] In this way, by incorporating solid fuel production device 1 in diaper station 27 where used disposable diapers are individually brought in, and providing boiler 29, generator 30, and power storage device 31 within diaper station 27, it is possible to cover the electricity used within diaper station 27. In other words, the solid fuel produced within diaper station 27 is burned in the boiler, the heat generated is used to generate steam, and this steam is used to rotate the turbine of generator 30 to generate electricity, and the generated electricity is stored in power storage device 31, thereby covering the electricity used within diaper station 27.

[0045] In addition, the solid fuel produced by the solid fuel production method and production device of this embodiment can be put into a coke oven and pyrolysis can be performed in the coke oven. In the coke oven, plastics are heated in an oxygen-free state in a sealed carbonization chamber and recovered as hydrocarbon oil, coke, and coke oven gas. Coke oven gas is a fuel gas whose main components are hydrogen and methane, and can be used as fuel in power plants, etc.

[0046] As described above, the embodiment of the present invention has been disclosed, but it is clear that modifications can be made by those skilled in the art without departing from the scope of the present invention. All such modifications and equivalents are intended to be included in the claims. [Industrial Applicability]

[0047] The solid fuel manufacturing method of the present invention can use other used sanitary products such as pet wipes as raw materials in addition to used paper diapers, and can also use plastics and pulp with a clear generation history as raw materials. [Explanation of symbols]

[0048] 1. Solid fuel manufacturing equipment 2 Used diaper processing equipment 3. Plapal (solids) 4. Plapal accumulation storage section (solids accumulation storage section) 5. Compression molding section 6 Solid fuel storage section 22 Solid fuel

Claims

1. A method for producing solid fuel using a used paper diaper treatment device that decomposes used paper diapers by mixing the materials constituting the paper diapers with a treatment liquid, and using solid matter obtained after the decomposition treatment as a raw material to produce solid fuel, comprising: The solid material is removed from the used paper diaper treatment device, The removed solid matter is stored in a solid matter accumulation storage section; removing a predetermined amount of the solid matter stored in the solid matter accumulation storage section; A predetermined amount of the solid material taken out from the solid material accumulation storage section is supplied to a compression molding section; A method for producing a solid fuel, comprising compressing and heating a predetermined amount of the solid material supplied to a compression molding section to produce a solid fuel.

2. 2. The method for producing a solid fuel according to claim 1, wherein the compression molding section compresses and molds a predetermined amount of the solid material supplied to the solid material supply section, and then stores the compressed solid material in the solid fuel storage section by an ejection mechanism.

3. 3. The method for producing solid fuel according to claim 1 or 2, wherein the solid matter is plastic-pulp, which is a solid component remaining after the used paper diapers are decomposed, and is a plastic-pulp-containing solid component remaining after the used paper diapers are decomposed.

4. A used paper diaper treatment device that mixes used paper diapers with a treatment liquid to decompose the materials that make up the paper diapers, and a solid fuel production device that produces solid fuel using the solid material obtained after the decomposition treatment as a raw material, a solid matter accumulation storage section that accumulates the solid matter removed from the used paper diaper treatment device; a compression molding unit that compresses and heats a predetermined amount of the solid material supplied from the solid material accumulation storage unit to produce a solid fuel; a solid fuel storage section for storing the solid fuel produced by compression molding in the compression molding section.

5. 5. The solid fuel manufacturing device according to claim 4, wherein the solid matter is plastic-pulp, which is a solid component remaining after the used paper diapers are decomposed and to which pulp is attached.

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