Continuous organic matter pyrolysis equipment

Abstract

To provide a continuous organic matter pyrolysis device and a continuous organic matter pyrolysis method that can thermally decompose an organic matter continuously and efficiently while suppressing decrease in thermal conductivity efficiency.SOLUTION: A continuous organic matter pyrolysis device 1 comprises: an inputting part 10 for continuously inputting an organic matter; a vertical container 12 for housing the organic matter inputted by the inputting part 10; stirring means 14 that is provided in the vertical container 12 and that stirs the organic matter; first heating means 16 that heats the vertical container 12 to thermally decompose the organic matter into a gas; a guide-out part 18 that is connected to an upper portion of the vertical container 12, and has a guide-out path 22 through which the thermal decomposition gas of the organic matter is guided outward; and a discharging part 20 that is connected to a lower portion of the vertical container 12, and has a discharging path 28 through which the residue of the organic matter is continuously discharged.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a continuous organic matter pyrolysis apparatus and a continuous organic matter pyrolysis method for continuously pyrolyzing organic matter.

Background Art

[0002] Conventionally, pyrolysis apparatuses for pyrolyzing organic matter have been used in many fields. In particular, a technique for pyrolyzing petrochemical waste materials such as waste plastics (waste materials mainly composed of plastics) and waste rubber to recover useful components is known.

[0003] As an apparatus for pyrolyzing such petrochemical waste materials, for example, there is proposed an apparatus including a material input device for charging and melting plastic, and a rotary kiln type pyrolysis furnace in which a part of this material input device is inserted and the melted plastic is pyrolyzed to recover pyrolysis gas. The material input device includes an inner cylinder extending to the pyrolysis furnace, a material input port provided on one end side of the inner cylinder, and a rotary blade disposed inside the inner cylinder and having a gradually decreasing interval from the material input port side to the material discharge port side (see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a pyrolysis apparatus for petrochemical waste materials using a conventional simple pyrolysis furnace, decomposition residues such as carbides generated during the pyrolysis of petrochemical waste materials gradually increase in the reaction furnace, and coking in the reaction furnace reduces the heat conduction efficiency and the processing capacity. Therefore, there is a problem that the reaction furnace needs to be cooled and cleaned after a predetermined treatment, and continuous operation cannot be performed.

[0006] Furthermore, in rotary kiln-type pyrolysis apparatuses using a horizontal reactor as described in Patent Document 1 above, multiple iron balls are placed inside the reactor as a measure against coking. However, since pyrolysis mainly occurs in the lower part of the reactor, coking cannot be sufficiently prevented, and long-term continuous operation remains difficult. In addition, the use of a horizontal reactor results in a large size for the apparatus.

[0007] The object of the present invention is to provide a continuous organic matter pyrolysis apparatus and a continuous organic matter pyrolysis method that can efficiently and continuously pyrolyze organic matter while suppressing a decrease in heat conduction efficiency. [Means for solving the problem]

[0008] While investigating methods for efficiently thermally decomposing organic matter, the inventors discovered that by continuously introducing organic matter into a vertical container filled with a solid heat transfer medium, heating and stirring the organic matter within the vertical container, recovering the thermal decomposition gas, and continuously discharging the organic matter residue from the vertical container, coking due to organic matter residue within the vertical container is prevented, a decrease in the thermal conductivity efficiency within the vertical container is suppressed, and organic matter can be efficiently and continuously thermally decomposed. This led to the completion of the present invention.

[0009] In other words, the present invention is as follows: [1] An input section for continuously feeding in organic matter, A vertical container for containing organic matter introduced from the aforementioned input section, The vertical container is provided with a stirring means for stirring organic matter, A first heating means that heats the vertical container and thermally decomposes the organic matter to gasify it, A discharge section is connected to the upper part of the aforementioned vertical container and is equipped with a discharge passage for dischargering the pyrolysis gas of organic matter, A discharge section is connected to the lower part of the aforementioned vertical container and is equipped with a discharge passage for continuously discharging organic matter residue, A continuous organic matter pyrolysis apparatus characterized by being equipped with the following features. [2] The continuous organic matter pyrolysis apparatus according to [1] above, characterized by comprising a second heating means for heating the discharge passage of the discharge section. [3] The continuous organic matter pyrolysis apparatus according to [2] above, characterized in that the second heating means is a means for heating the discharge section to a higher temperature than the vertical container. [4] A continuous organic matter pyrolysis apparatus according to any one of [1] to [3] above, characterized in that the discharge passage of the discharge section is located below the lower part of the vertical container. [5] A continuous organic matter pyrolysis apparatus according to any one of [1] to [3] above, characterized in that the discharge passage of the discharge section is located on the lower side of the vertical container. [6] The discharge passage of the discharge section is It is composed of a gap formed between the inner surface of a cylindrical body connected to the bottom of the vertical container, which narrows towards the bottom, and the outer surface of a spacer provided inside the cylindrical body, which also narrows towards the bottom. It communicates with an opening provided on the outer circumference of the bottom of the aforementioned vertical container. A continuous organic matter pyrolysis apparatus according to any one of the above [1] to [4], characterized in that [7] The continuous organic matter pyrolysis apparatus according to any one of [1] to [6] above, characterized in that the stirring means comprises a rotating shaft provided vertically in the center of a vertical container and a stirring blade connected to the rotating shaft and rotating around the shaft. [8] The continuous organic matter pyrolysis apparatus according to [7] above, characterized in that the stirring means is a means capable of stirring up organic matter from bottom to top. [9] The continuous organic matter pyrolysis apparatus according to [7] or [8] above, characterized in that the spacer is provided with a discharge channel stirring member on its inclined surface and is connected to the rotation axis of the stirring means provided vertically in the center of the vertical container and rotates around that axis.

[0010]

[10] A continuous feeding process in which organic matter and solid heat transfer medium are continuously fed into a vertical container filled with a solid heat transfer medium, A thermal decomposition step is performed in which the organic matter and the solid heat transfer medium introduced into the vertical container in the continuous input step are heated and stirred to thermally decompose the organic matter. A recovery step for recovering the pyrolysis gas generated in the pyrolysis step, A continuous discharge step involves continuously discharging the organic residue generated in the thermal decomposition step, together with a portion of the solid heat transfer medium, to the outside of the vertical container. A continuous method for the thermal decomposition of organic matter, characterized by having the following features.

[11] The continuous organic matter pyrolysis method according to

[10] above, characterized in that the discharged organic matter residue and solid heat transfer medium are heated in the continuous discharge step.

[12] The continuous organic matter pyrolysis method according to

[11] above, characterized in that, in the continuous discharge step, the discharged organic matter residue and solid heat transfer medium are heated at a temperature higher than the heating temperature of the pyrolysis step.

[13] A continuous organic matter pyrolysis method according to any one of

[10] to

[12] above, characterized in that the amount of organic matter added to 100 L of solid heat transfer medium in the vertical container is in the range of 1 to 50 kg / h.

[14] A continuous organic matter pyrolysis method according to any one of

[10] to

[13] above, characterized in that the solid heat transfer medium is a spherical solid having a diameter of 0.1 μm to 150 mm.

[15] A continuous organic matter pyrolysis method according to any one of the above

[10] to

[14] , characterized in that the solid heat transfer medium is at least one solid selected from the group consisting of alkaline earth metal solids, silica solids, sand, alumina solids, and zeolite solids.

[16] A continuous organic matter pyrolysis method according to any one of

[10] to

[15] above, characterized in that the organic matter introduced in the continuous input step is waste plastic or waste rubber.

[17] A continuous organic matter pyrolysis method according to any one of

[10] to

[16] above, characterized by using a continuous organic matter pyrolysis apparatus according to any one of [1] to [9] above.

[0011]

[18] A continuous organic matter pyrolysis apparatus as described in any of [1] to [9] above, The continuous organic matter pyrolysis apparatus includes an organic matter input device for continuously feeding organic matter into the aforementioned continuous organic matter pyrolysis apparatus, A gas recovery device for recovering the pyrolysis gas of the organic matter pyrolyzed by the continuous organic matter pyrolysis device, A recycled organic matter recovery system characterized by comprising

Advantages of the Invention

[0012] According to the continuous organic matter pyrolysis device and the continuous organic matter pyrolysis method of the present invention, it is possible to suppress a decrease in heat conduction efficiency and efficiently and continuously pyrolyze organic matter.

Brief Description of the Drawings

[0013] [Figure 1] It is an explanatory diagram of a continuous organic matter pyrolysis device according to an embodiment of the present invention. [Figure 2] It is an explanatory diagram of the vertical container and the discharge part of the continuous organic matter pyrolysis device shown in FIG. 1. [Figure 3] It is an enlarged view of the discharge part of the continuous organic matter pyrolysis device shown in FIG. 1. [Figure 4] It is an explanatory diagram of the stirring blade of the continuous organic matter pyrolysis device according to another embodiment of the present invention, (a) shows a paddle type stirring blade, and (b) shows a gate type stirring blade. [Figure 5] It is a photograph of the organic matter residue obtained in the continuous discharge test of Example 1.

Modes for Carrying Out the Invention

[0014] The continuous organic matter pyrolysis device of the present invention includes an input part for continuously inputting organic matter, a vertical container for accommodating the organic matter input from the input part, a stirring means provided in the vertical container for stirring the organic matter, a first heating means for heating the vertical container and pyrolyzing and gasifying the organic matter, a导出部 (derivation part) connected to the upper part of the vertical container and having a derivation path for导出 (deriving) the pyrolysis gas of the organic matter, and a discharge part connected to the lower part of the vertical container and having a discharge path for continuously discharging the organic matter residue. The continuous organic matter pyrolysis device of the present invention is used in a state filled with a solid heat medium.

[0015] The continuous organic matter pyrolysis apparatus of the present invention heats and pyrolyzes organic matter that is continuously fed in while stirring it in a vertical container filled with a solid heat transfer medium, and continuously discharges the organic matter residue. This prevents coking by organic matter residue in the vertical container and suppresses a decrease in heat conduction efficiency, allowing for efficient and continuous pyrolysis of organic matter. Specifically, stirring the solid heat transfer medium in the vertical container prevents organic matter residue (carbonized material) from adhering to the walls of the vertical container, and the continuous discharge of unwanted organic matter residue prevents coking.

[0016] The organic matter to be processed in this invention (the organic matter to be input) is not particularly limited, and examples include waste plastics and waste rubber contained in petrochemical waste materials, and may also contain components other than organic matter. Examples of waste plastics include waste mainly composed of plastic separated from municipal waste and industrial waste, such as those mainly composed of thermoplastic resins such as polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), and ABS. Furthermore, waste plastics may also contain polyvinyl chloride (PVC) containing chlorine as a component, thermosetting resins, FRP, paper, and other impurities. Examples of waste rubber include synthetic rubber waste such as waste tires and natural rubber waste. Examples of organic matter shapes include fluff, bead, flake, chip, granule, and pellet shapes.

[0017] The configuration of the continuous organic matter pyrolysis apparatus of the present invention will be described in detail below. [Insertion section] The input section is a means for continuously inputting the organic material to be processed, and is usually located at the top of a vertical container and connected to a raw material input device. Specifically, a raw material input hopper can be cited. In this invention, continuous input includes not only the case of inputting continuously, but also the case of inputting intermittently.

[0018] [Vertical container] A vertical container is a vertically elongated container that contains organic matter placed inside. The cross-sectional shape of the vertical container can be, for example, circular, elliptical, or polygonal, but a circular shape is preferred from the standpoint of suppressing caulking and ease of cleaning. Furthermore, the ratio of the container's height to its diameter (L / D) is approximately 1 to 5, and preferably 1 to 3. The vertical container may be inclined relative to the vertical direction, with an inclination angle of 0 to 45°, preferably 30° or less, more preferably 15° or less, even more preferably 5° or less, and particularly preferably 0° (perpendicular). As mentioned above, this vertical container is filled with a solid heat transfer medium during the pyrolysis process. There are no particular restrictions on the amount of solid heat transfer medium filled in the vertical container; for example, it can be around 50-90% by volume. The solid heat transfer medium will be discussed later.

[0019] [Means of stirring] The stirring means is a means of stirring the organic matter contained in the vertical container together with the solid heat transfer medium. Specifically, the stirring means is not particularly limited as long as it can stir the contents (organic matter and solid heat transfer medium), but an example is a means that has a rotating shaft provided vertically in the center of the vertical container and stirring blades connected to the rotating shaft and rotating around the shaft, and a configuration that can stir the contents from bottom to top is preferred. By stirring with the stirring means, the contents are stirred more efficiently and uniformly. Since the thermal decomposition of organic matter mainly takes place in the upper part of the vertical container (in contact with the solid heat transfer medium located at the top), efficient thermal decomposition can be carried out by efficiently replacing the solid heat transfer medium at the top. Note that two or more stirring means may be provided.

[0020] Examples of types of stirring blades for the stirring means include ribbon type, paddle type, propeller type, turbine type, gate type, and anchor type. Single type and double ribbon type are preferred, with the double ribbon type being more preferred, as they can effectively stir up organic matter.

[0021] The distance (clearance) between the tip of the stirring blade and the inner surface of the vertical container is not particularly limited as long as it is large enough for the stirred-up organic matter to fall smoothly. For example, it can be 5 to 50 mm, and 5 to 20 mm is preferred.

[0022] Furthermore, the peripheral speed of the stirring blade is usually 0.1 m / s or higher, preferably 0.5 to 5.0 m / s, more preferably 0.7 to 4.0 m / s, and even more preferably 1.0 to 3.0 m / s. By stirring at such a speed, the contents of the vertical container are sufficiently stirred, and the thermal decomposition treatment of organic matter can be carried out efficiently.

[0023] [First heating means] The first heating means is a means of heating the vertical container to thermally decompose organic matter and gasify it. The first heating means may be a direct heating means that directly introduces thermal energy into the vertical container, or an indirect heating means that supplies thermal energy from outside the vertical container. An example of a direct heating means is a burner installed inside the vertical container. An example of an indirect heating means is an electric heater or gas burner that heats the peripheral wall of the vertical container from the outside, or a means of introducing hot air or a heat transfer oil into the space outside the vertical container. The internal temperature of a vertical container is typically around 350-550°C, and preferably around 400-450°C.

[0024] [Derivation part] The discharge section is a means that includes a discharge passage connected to the top of the vertical container for discharging the pyrolysis gas of organic matter. The discharge passage is connected to the lid or upper side of the vertical container and guides the pyrolysis gas generated inside the vertical container to a gas recovery device.

[0025] [Discharge section] The discharge section is a means equipped with a discharge channel connected to the bottom of the vertical container for the continuous discharge of organic residue. By continuously discharging the organic residue, the amount of organic residue accumulating in the vertical container can be reduced, and the increase in organic residue in the vertical container, which would worsen the stirring condition, can be suppressed. This organic residue is mainly discharged attached to the solid heat transfer medium or as powdered carbonized material together with the solid heat transfer medium.

[0026] Furthermore, the continuous discharge in this invention is a concept that includes not only literally continuous discharge but also intermittent discharge. In other words, the discharge amount can be controlled based on factors such as the amount of organic matter (and solid heat transfer medium) input. For example, the discharge amount can be controlled by providing an on / off valve in the discharge path. Alternatively, the discharge amount can be controlled by the transfer speed of the transfer device described later.

[0027] In conventional pyrolysis equipment for petrochemical waste, in addition to organic residues such as carbides generated during pyrolysis, impurities and additives contained during the manufacturing of petrochemical products, as well as inorganic materials such as metals and glass mixed into petrochemical waste, gradually increase within the equipment, causing a decrease in processing capacity. However, in the equipment of the present invention, processing capacity can be maintained by continuously discharging these materials.

[0028] The discharge section (discharge passage) is not particularly limited as long as it is connected to the bottom of the vertical container, but it is preferably located below or to the side of the bottom of the vertical container, and more preferably located below the bottom of the vertical container. Since the organic matter input section is usually provided at the top of the vertical container, by locating the discharge section away from the input section, the organic matter residue can be discharged in a state where the organic matter has been reliably thermally decomposed.

[0029] Specifically, a preferred configuration of the discharge passage is one in which a gap is formed between the inner surface of a cylindrical body connected to the bottom of the vertical container, which narrows towards the bottom, and the outer surface of a spacer provided inside the cylindrical body, which also narrows towards the bottom. In this configuration, the organic residue (and solid heat transfer medium) inside the vertical container is discharged through an opening provided on the outer circumference of the bottom of the vertical container, but after being stirred up by a stirring means provided in the center, it is smoothly discharged in a flow that descends the outer circumference.

[0030] The cylindrical body attached to the bottom of the vertical container can have a cross-sectional shape similar to that of the vertical container, such as a circle, ellipse, or polygon, with a circle being preferred. Furthermore, the inner surface of the cylindrical body should be structured to narrow towards the bottom, and its outer shape can be a rectangular parallelepiped, cylindrical, inverted truncated cone, inverted cone, or the like.

[0031] The inclination angle of the inner surface of the cylindrical body (the inclination angle between the bottom surface of the vertical container and the inner surface of the cylindrical body) is preferably 30 to 85°, more preferably 45 to 80°, and even more preferably 45 to 75°. This inclination angle allows organic residue to be smoothly guided to the discharge port at the bottom.

[0032] The spacer, which forms a discharge passage together with the cylindrical body and is provided inside the cylindrical body, is not particularly limited as long as its outer surface has a shape that tapers towards the bottom, and it is preferable that its angle of inclination is the same as the angle of inclination of the inner surface of the cylindrical body. Specifically, examples of the outer shape of the spacer include an inverted frustoconical shape, an inverted cone shape, etc.

[0033] The gap formed between the inner surface of the cylindrical body and the outer surface of the spacer is preferably 1 to 150 mm, more preferably 10 to 80 mm, and even more preferably 10 to 40 mm. This gap range allows organic residue to be smoothly guided to the discharge port at the bottom.

[0034] Furthermore, it is preferable that the spacer is equipped with a discharge channel stirring member on its inclined surface and is connected to the rotation axis of a stirring means provided vertically in the center of the vertical container, so that it rotates around that axis. This prevents clogging and stagnation of organic residue in the discharge channel, enabling stable discharge. Specifically, the discharge channel stirring means can be a rod member provided on the inclined surface of the spacer.

[0035] The organic residue discharged from the discharge section may be discharged by gravity or other means from the discharge port at the bottom, but it is preferable that it be discharged auxiliaryly by power to prevent bridging. That is, it is preferable that the continuous organic pyrolysis apparatus of the present invention is equipped with a transfer device connected to the discharge section. This allows the discharge rate of the organic residue to be adjusted. Examples of transfer devices include screw conveyors. Furthermore, it is preferable that the transfer device is equipped with a cooling means for cooling the discharged organic residue.

[0036] [Second heating means] The continuous organic matter pyrolysis apparatus of the present invention preferably includes a second heating means for heating the discharge passage of the discharge section. The second heating means heats the discharged organic matter residue, ensuring that any undecomposed organic matter is reliably pyrolyzed. In particular, since the discharge passage (for example, the gap between the cylindrical body and the spacer) has a smaller cross-sectional area than the cross-sectional area of ​​the vertical container, the thermal energy of the heating means is sufficiently transferred to the organic matter passing through the discharge passage, thus more reliably preventing the undecomposed organic matter.

[0037] The second heating means may heat the discharge section to the same temperature as the vertical container, but it is preferable that it is a means capable of heating the discharge section to a higher temperature than the vertical container. For example, it is preferable that the temperature is 5°C or more higher, more preferably 5°C to 100°C higher, even more preferably 8°C to 70°C higher, and most preferably 10°C to 50°C higher.

[0038] Furthermore, the second heating means may be a means provided separately from the first heating means, or the first heating means may also serve as the second heating means. Examples of the second heating means include an electric heater or gas burner that heats the peripheral wall of the discharge passage from the outside, and means for introducing hot air into the space outside the discharge passage.

[0039] When the first heating means also serves as the second heating means, the heating means can be configured to include a heating medium passage surrounding the vertical container and the discharge section, and to introduce a heating medium such as hot air into the heating medium passage. In this case, by providing the inlet of the heating medium passage on the discharge section side and the outlet on the vertical container side, the discharge section side can be made to a higher temperature.

[0040] Next, the continuous organic matter pyrolysis method of the present invention will be described. The continuous organic matter pyrolysis method of the present invention can be carried out using the continuous organic matter pyrolysis apparatus described above.

[0041] The present invention provides a continuous organic matter thermal decomposition method comprising: a continuous input step of continuously inputting organic matter and a solid heat transfer medium into a vertical container filled with a solid heat transfer medium; a thermal decomposition step of heating and stirring the organic matter and solid heat transfer medium introduced into the vertical container in the continuous input step to thermally decompose the organic matter; and a continuous discharge step of continuously discharging the organic matter residue generated in the thermal decomposition step, along with a portion of the solid heat transfer medium, to the outside of the vertical container.

[0042] According to the organic matter thermal decomposition method of the present invention, organic matter that is continuously fed in is heated and thermally decomposed while being stirred in a vertical container filled with a solid heat transfer medium, and the organic matter residue is continuously discharged. This prevents coking by organic matter residue in the vertical container and suppresses a decrease in heat conduction efficiency, allowing for efficient and continuous thermal decomposition of organic matter. Specifically, stirring of the solid heat transfer medium in the vertical container prevents organic matter residue (carbonized material) from adhering to the walls of the vertical container, and the continuous discharge of unwanted organic matter residue prevents coking.

[0043] The organic matter that can be used in the organic matter pyrolysis method of the present invention is the same as that used in the continuous organic matter pyrolysis apparatus described above. Other cases similar to those in the continuous organic matter pyrolysis apparatus will be omitted from the explanation as appropriate.

[0044] [Continuous feeding process] The continuous feeding process involves continuously feeding organic matter and solid heat transfer fluid into a vertical container filled with solid heat transfer fluid. The term "continuous feeding" includes not only continuous feeding but also intermittent feeding. Furthermore, the organic matter and solid heat transfer fluid may be fed simultaneously or separately. This continuous feeding and continuous discharge process allows for maintaining a constant ratio of organic matter and solid heat transfer fluid within the vertical container.

[0045] [Pyrolysis process] The pyrolysis process involves heating and stirring the organic matter and solid heat transfer medium introduced into the vertical container during the continuous input process to pyrolyze the organic matter. By heating and stirring the organic matter and solid heat transfer medium, heat can be efficiently transferred to the organic matter, and coking by organic matter residue in the vertical container can be prevented, maintaining high heat transfer efficiency, thus enabling efficient pyrolysis of the organic matter. Furthermore, for more efficient pyrolysis, it is preferable to stir and mix the organic matter and solid heat transfer medium from bottom to top.

[0046] The amount of organic matter (undecomposed organic matter) to be added to the solid heat transfer medium contained in the vertical container is 200 kg / h or less per 100 L of solid heat transfer medium contained in the vertical container, preferably between 1 and 100 kg / h, more preferably between 1 and 50 kg / h, and particularly preferably between 30 kg / h. Within this range, the organic matter can be efficiently thermally decomposed, and the generation of undecomposed organic matter can be prevented. Furthermore, thermal decomposition can be performed while keeping the inside of the vertical container dry.

[0047] The ratio of organic matter (undecomposed organic matter) to the solid heat transfer medium discharged from the vertical container is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 1% by mass or less. In the organic matter pyrolysis method of the present invention, since the discharged material does not contain undecomposed organic matter, pyrolysis gas can be recovered efficiently.

[0048] The size of the solid heat transfer medium can be appropriately set depending on the type of organic matter being introduced, but for example, the diameter is approximately 0.1 μm to 150 mm. Specifically, the solid heat transfer medium can be a powder or granular material with a diameter of 0.1 μm to 1 mm, or a lump with a diameter of more than 1 mm to approximately 15 mm. Furthermore, there are no particular restrictions on the shape of the solid heat transfer medium, but from the viewpoint of improving fluidity, a spherical shape is preferred, a nearly spherical shape is more preferred, and a perfect sphere is particularly preferred. This suppresses stirring resistance caused by the solid heat transfer medium and stirring resistance caused by the precipitation of fine powder due to friction between the solid heat transfer mediums, and allows for a more compact stirring motor and stirring blades. By changing the size of the solid heat transfer medium according to the type of organic matter, the separation of the discharged solid heat transfer medium and organic matter residue becomes easier. Specifically, when the organic material is waste plastic, powders with a diameter of approximately 0.1 μm to 1 mm can be suitably used. When the organic material is waste tires or other materials that produce a large amount of carbide precipitates, and it is desired to separate the carbide from the solid heat transfer medium, lumps with a diameter of more than 1 mm to approximately 150 mm can be suitably used.

[0049] The solid heat transfer medium can be appropriately selected depending on the type of organic matter being introduced, but examples include alkaline earth metal solids, silica solids, alumina solids, sand, and zeolite solids. Examples of alkaline earth metal solids include calcium solids such as calcium hydroxide and calcium carbonate, and magnesium solids such as magnesium hydroxide and magnesium carbonate. Examples of zeolite solids include zeolite, FCC catalysts (catalysts used in fluid catalytic cracking in petroleum refining), and spent FCC catalysts.

[0050] The thermal decomposition temperature in the thermal decomposition process is not particularly limited, but is preferably 350 to 550°C. Furthermore, the pressure inside the vertical container during the thermal decomposition process is not particularly limited, but is preferably, for example, 100 kPa (atmospheric pressure) or less.

[0051] [Recovery Process] The recovery process involves recovering the pyrolysis gases generated in the pyrolysis process. The pyrolysis gases recovered in this process are separated into light hydrocarbon gases such as methane and other oily components, and then utilized.

[0052] [Continuous discharge process] The continuous discharge process is a process in which the organic residue generated in the pyrolysis process, along with a portion of the solid heat transfer medium, is continuously discharged outside the vertical container. In this process, it is preferable to heat the discharged organic residue and solid heat transfer medium. Furthermore, it is preferable that the heating temperature in this process be higher than the heating temperature in the pyrolysis process.

[0053] When the discharge section is heated, it is preferable that the residence time of the organic residue in the discharge section be 10 minutes or more, more preferably 30 minutes or more, and even more preferably 60 minutes or more. This makes it possible to keep the proportion of undecomposed organic matter in the discharged organic residue at 5% by mass or less.

[0054] Next, a regenerated organic matter recovery system using the continuous organic matter pyrolysis apparatus of the present invention described above will be explained.

[0055] The present invention provides a regenerative organic matter recovery system comprising the above-described continuous organic matter pyrolysis apparatus, an organic matter input device for continuously feeding organic matter into the continuous organic matter pyrolysis apparatus, and a gas recovery device for recovering the pyrolysis gas of the organic matter pyrolyzed in the continuous organic matter pyrolysis apparatus.

[0056] According to the recycled organic matter recovery system of the present invention, useful recycled organic matter can be efficiently recovered from waste organic matter and the like.

[0057] Hereinafter, with reference to the drawings, one embodiment of the continuous organic matter pyrolysis apparatus of the present invention will be described in detail. Here, Figure 1 is an explanatory diagram of a continuous organic pyrolysis apparatus according to one embodiment of the present invention, Figure 2 is an explanatory diagram of the vertical container and discharge section of the continuous organic pyrolysis apparatus shown in Figure 1, and Figure 3 is an enlarged view of the discharge section of the continuous organic pyrolysis apparatus shown in Figure 1. Figure 4 is an explanatory diagram of the stirring blade of a continuous organic pyrolysis apparatus according to another embodiment of the present invention, where (a) shows a paddle-type stirring blade and (b) shows a gate-type stirring blade.

[0058] As shown in Figures 1 and 2, the continuous organic matter pyrolysis apparatus 1 according to one embodiment of the present invention comprises an input section 10 for continuously inputting organic matter, a vertical container 12 for containing organic matter, a stirring means 14 for stirring organic matter, a first heating means 16 for heating the vertical container 12 and pyrolyzing and gasifying the organic matter, an output section 18 for outputting the pyrolysis gas of organic matter, and an output section 20 for continuously outputting organic matter residue.

[0059] As shown in Figure 1, the input section 10 is located at the top of the vertical container 12 and is connected to the raw material input device. The output section 18 is connected to the top of the vertical container 12 and includes an output passage 22 for outputting the pyrolysis gas of organic matter. The output passage 22 is connected to the lid of the vertical container 12 and guides the pyrolysis gas generated in the vertical container 12 to the gas recovery device.

[0060] As shown in Figures 1 and 2, the vertical container 12 is a vertically elongated container capable of holding approximately 200L of organic materials such as waste plastics and waste rubber that are introduced from the input section 10. In addition, during the thermal decomposition treatment, the vertical container 12 is filled with a solid heat transfer medium at a volume of approximately 70%.

[0061] As shown in Figures 1 and 2, the stirring means 14 is equipped with a rotating shaft 24 located vertically in the center of the vertical container 12, and a double ribbon-shaped stirring blade 26 connected to the rotating shaft 24 and rotating around that shaft, and is configured to stir up the contents from bottom to top.

[0062] As shown in Figure 3, the discharge section 20 is equipped with a discharge passage 28 connected to the lower part of the vertical container 12 for continuously discharging organic residue. The discharge passage 28 is composed of a gap of approximately 40 mm formed between the inner surface of a cylindrical body 30 connected to the lower part of the vertical container 12, which narrows towards the bottom, and the outer surface of a spacer 32 provided inside the cylindrical body 30, which also narrows towards the bottom, and communicates with an opening provided on the outer circumference of the bottom of the vertical container 12. The cylindrical body 30 is formed in the shape of an inverted frustocone with a circular cross-section. The spacer 32 is also formed in the shape of an inverted frustocone with the same inclination angle of 60° as the inclination angle of the inner surface of the cylindrical body 30. The spacer 32 is equipped with a rod member 34 as a discharge passage stirring member on its inclined surface and is connected to the rotation axis 24 of a stirring means 14 provided vertically in the center of the vertical container 12, and rotates around that axis.

[0063] Furthermore, as shown in Figure 1, the continuous organic matter pyrolysis apparatus 1 is equipped with a first heating means 16 that heats the vertical container 12 and pyrolyzes and gasifies organic matter. The first heating means 16 is a means for introducing hot air generated by a hot air generator 38 into a heating medium passage 36 that surrounds the vertical container 12 and the discharge section 20. The first heating means 16 also serves as a second heating means for heating the discharge passage 28 of the discharge section 20. The heating medium passage 36 has an inlet on the discharge section 20 side and an outlet on the vertical container 12 side, and a baffle plate 40 is provided between the inlet and outlet to separate the outside of the vertical container 12 from the outside of the discharge section 20, so that the discharge section 20 side can be heated to a higher temperature.

[0064] Furthermore, as shown in Figure 1, the continuous organic matter pyrolysis apparatus 1 is equipped with a transport device connected to the discharge section 20 and a cooling screw conveyor 42 as a cooling means. The cooling screw conveyor 42 can cool the organic matter discharged from the discharge section 20 while transporting it.

[0065] As shown in Figure 4, in the continuous organic pyrolysis apparatus 1, a double ribbon type stirring blade 26 was used as the stirring blade of the stirring means 14, but other stirring blades such as a paddle type stirring blade (a) or a gate type stirring blade (b) may also be used. [Examples]

[0066] (Example 1) [Continuous discharge test] The organic residue continuously discharged using the continuous organic matter pyrolysis apparatus and continuous organic matter pyrolysis method of the present invention was analyzed.

[0067] First, 70 liters of spent FCC catalyst powder were filled into a 100-liter vertical container, and the inside of the vertical container was heated to 450°C, while the discharge passage of the discharge section was heated to 480°C. After the heat had spread throughout the vertical container and stabilized, discharge was started by transporting the materials via a cooling screw conveyor connected to the discharge section, and continuous processing commenced. Waste plastics were continuously fed in at a rate of 30 L / h, and spent FCC catalysts were continuously fed in until the vertical container reached 70 L, and the processing was carried out so that 3% of the waste plastics remained undecomposed relative to the spent FCC catalyst. 10 g of organic residue was obtained from the organic matter residue discharged one hour after the start of continuous processing (Figure 5). Next, 10 g of organic residue was calcined at 450°C for 1 hour. The mass of each organic residue after calcination was measured. The results are shown in Table 1.

[0068] [Table 1]

[0069] As shown in Table 1, no difference in mass was observed before and after firing at 450°C for 1 hour. 450°C is the temperature at which oil vaporizes, but since there was no change in mass, it can be concluded that the organic matter that would become oil was completely decomposed by thermal energy and did not remain as organic residue. [Industrial applicability]

[0070] The organic thermal decomposition apparatus of the present invention is industrially useful because it can be used to recover oil from organic materials such as waste plastics. [Explanation of symbols]

[0071] 1. Continuous organic matter pyrolysis apparatus 10 Input section 12 Vertical containers 14. Stirring means 16 First heating means (second heating means) 18 Derivation part 20 Discharge section 22 Derivation 24 rotation axes 26 Double Ribbon Type Stirring Blades 28 Exhaust channel 30 Cylinder 32 Spacers 34. Rod-shaped member (discharge channel stirring member) 36 Heating medium passage 38. Hot air generator 40 Obstacle board 42 Cooling screw conveyor

Claims

1. An input section for continuously inputting organic matter and a solid heat transfer medium; A vertical container for accommodating the organic matter and the solid heat transfer medium introduced through the introduction portion; A stirring means provided in the vertical vessel for stirring the organic matter and the solid heat transfer medium; a first heating means for heating the vertical container and pyrolyzing and gasifying the organic matter; an outlet section connected to an upper portion of the vertical vessel and having an outlet path for outletting a pyrolysis gas of an organic substance; A discharge section connected to a lower portion of the vertical container and having a discharge path for continuously discharging the organic residue and a portion of the solid heat transfer medium; Equipped with The discharge path of the discharge section is The space is formed between an inner surface of a cylindrical body connected to the bottom of the vertical container, the inner surface narrowing toward the bottom, and an outer surface of a spacer provided inside the cylindrical body, the outer surface narrowing toward the bottom. A continuous organic matter pyrolysis apparatus characterized by the above.

2. 2. The continuous organic matter pyrolysis apparatus according to claim 1, further comprising a second heating means for heating the discharge passage of the discharge section.

3. 3. The continuous organic matter pyrolysis apparatus according to claim 2, wherein the second heating means is a means for heating the discharge section to a temperature higher than that of the vertical vessel.

4. 4. The continuous organic matter pyrolysis apparatus according to claim 1, wherein the discharge passage of the discharge section is disposed below the lower part of the vertical vessel.

5. 4. The continuous organic matter pyrolysis apparatus according to claim 1, wherein the discharge passage of the discharge section is disposed at a lower lateral portion of the vertical vessel.

6. The continuous organic matter pyrolysis apparatus according to any one of claims 1 to 3, characterized in that the stirring means comprises a rotating shaft provided in the vertical direction at the center of the vertical vessel, and a stirring blade connected to the rotating shaft and rotating around the shaft.

7. 7. The continuous organic matter pyrolysis apparatus according to claim 6, wherein the stirring means is a means capable of stirring up the organic matter and the solid heat transfer medium from the bottom up.

8. The continuous organic matter pyrolysis apparatus according to any one of claims 1 to 3, characterized in that the spacer is provided with a discharge path stirring member on its inclined surface, and is connected to a rotating shaft of the stirring means provided in the vertical direction at the center of the vertical vessel and rotates around the axis.

Images