Continuous organic matter pyrolysis device and continuous organic matter pyrolysis method

Abstract

A continuous organic matter pyrolysis device 1 comprising: an inputting part 10 for continuously inputting organic matter; a vertical container 12 for housing the organic matter inputted by the inputting part 10; a stirring means 14 that is provided in the vertical container 12 and that stirs the organic matter; a 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 residue of the organic matter is continuously discharged.

Description

Continuous organic matter pyrolysis device and continuous organic matter pyrolysis method

[0001] The present invention relates to a continuous organic matter thermal decomposition apparatus and a continuous organic matter thermal decomposition method for continuously thermally decomposing organic matter.

[0002] Pyrolysis devices that thermally decompose organic matter have been used in many fields. In particular, a technology for recovering useful components by thermally decomposing waste petrochemical products, such as waste plastics (waste primarily composed of plastic) and waste rubber, is well known.

[0003] One proposed device for pyrolyzing such petrochemical waste materials includes, for example, a material feeding device into which plastic is fed and melted, and a rotary kiln-type pyrolysis furnace into which a portion of the material feeding device is inserted to pyrolyze the molten plastic and recover pyrolysis gases. The material feeding device includes an inner cylinder extending to the pyrolysis furnace, a material feeding inlet provided at one end of the inner cylinder, and rotating blades arranged inside the inner cylinder with the spacing between them gradually narrowing from the material feeding inlet side to the material discharge outlet side (see Patent Document 1).

[0004] JP 2009-249576 A

[0005] In conventional petrochemical waste pyrolysis equipment using simple pyrolysis furnaces, decomposition residues such as charcoal generated during the pyrolysis of petrochemical waste gradually increase inside the reactor, causing coking inside the reactor, which reduces heat transfer efficiency and processing capacity. Therefore, the reactor needs to be cooled and cleaned after a specified period of processing, which makes continuous operation impossible.

[0006] Furthermore, in a rotary kiln-type pyrolysis apparatus using a horizontal reactor as described in Patent Document 1, multiple iron balls or the like are placed in the reactor as a countermeasure against coking, but since pyrolysis occurs mainly in the lower part of the reactor, it is not possible to sufficiently prevent coking, and long-term continuous operation is also difficult. Furthermore, the use of a horizontal reactor has the problem of making the apparatus large.

[0007] An object of the present invention is to provide a continuous organic matter thermal decomposition apparatus and a continuous organic matter thermal decomposition method that can suppress a decrease in heat conduction efficiency and efficiently and continuously pyrolyze organic matter.

[0008] While investigating methods for efficiently pyrolyzing organic matter, the inventors discovered that by continuously feeding the organic matter into a vertical container filled with a solid heat transfer medium, heating and stirring the organic matter in the vertical container, recovering pyrolysis gas, and continuously discharging the organic residue from the vertical container, it is possible to prevent coking caused by the organic residue in the vertical container, suppress a decrease in the heat conduction efficiency within the vertical container, and efficiently and continuously pyrolyze the organic matter, which led to the completion of the present invention.

[0009] That is, the present invention is as follows. [1] A continuous organic matter pyrolysis apparatus comprising: an inlet section for continuously introducing organic matter; a vertical container for storing the organic matter introduced from the inlet section; 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; an outlet section connected to the upper part of the vertical container and equipped with an outlet path for extracting pyrolysis gas of the organic matter; and a discharge section connected to the lower part of the vertical container and equipped with an outlet path for continuously discharging organic residue. [2] The continuous organic matter pyrolysis apparatus according to [1] above, characterized in that it comprises a second heating means for heating the outlet path of the outlet 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 outlet section to a temperature higher than that of the vertical container. [4] The continuous organic matter pyrolysis apparatus according to any one of [1] to [3] above, characterized in that the outlet path of the outlet section is located below the lower part of the vertical container. [5] The continuous organic matter pyrolysis apparatus according to any one of [1] to [3] above, characterized in that the discharge channel of the discharge unit is located at the lower lateral side of the vertical vessel. [6] The continuous organic matter pyrolysis apparatus according to any one of [1] to [4] above, characterized in that the discharge channel of the discharge unit is formed by a gap between the inner surface of a cylindrical body connected to the lower part of the vertical vessel, the inner surface tapering toward the bottom, and the outer surface of a spacer provided within the cylindrical body, the spacer also tapering toward the bottom, and is connected to an opening provided on the outer periphery of the bottom of the vertical vessel. [7] The continuous organic matter pyrolysis apparatus according to any one of [1] to [6] above, characterized in that the stirring means includes a rotating shaft provided vertically in the center of the vertical vessel and a stirring blade connected to the rotating shaft and rotating around the rotating shaft. [8] The continuous organic matter pyrolysis apparatus according to [7] above, characterized in that the stirring means is a means capable of scraping up organic matter from bottom to top. [9] A continuous organic matter pyrolysis apparatus according to [7] or [8] above, characterized in that the spacer is provided with a discharge path stirring member on its inclined surface, and is connected to the rotating shaft of the stirring means provided vertically in the center of the vertical vessel, and rotates around that axis.

[0010]

[10] A continuous organic matter thermal decomposition method comprising: a continuous feeding step of continuously feeding organic matter and the solid heat medium into a vertical vessel filled with a solid heat medium; a pyrolysis step of heating and stirring the organic matter and the solid heat medium fed into the vertical vessel in the continuous feeding step to thermally decompose the organic matter; a recovery step of recovering pyrolysis gas generated in the pyrolysis step; and a continuous discharge step of continuously discharging the organic residue generated in the pyrolysis step together with a portion of the solid heat medium from the vertical vessel.

[11] The continuous organic matter thermal decomposition method according to

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

[12] The continuous organic matter thermal decomposition method according to

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

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

[10] to

[12] , wherein the organic matter and the solid heat transfer medium are continuously fed into the vertical vessel so that the organic matter is fed at a rate of 1 to 50 kg / h per 100 L of the solid heat transfer medium.

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

[10] to

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

[15] The continuous organic matter pyrolysis method according to any one of

[10] to

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

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

[10] to

[15] , wherein the organic matter fed in the continuous feeding step is waste plastic or waste rubber.

[17] The continuous organic matter thermal decomposition method according to any one of

[10] to

[16] above, characterized in that the continuous organic matter thermal decomposition apparatus according to any one of [1] to [9] above is used.

[0011]

[18] A recycled organic matter recovery system comprising: a continuous organic matter pyrolysis device according to any one of [1] to [9] above; an organic matter feeding device that continuously feeds organic matter into the continuous organic matter pyrolysis device; and a gas recovery device that recovers pyrolysis gas from the organic matter pyrolyzed in the continuous organic matter pyrolysis device.

[0012] According to the continuous organic matter thermal decomposition apparatus and continuous organic matter thermal decomposition method of the present invention, the decrease in heat conduction efficiency can be suppressed, and organic matter can be efficiently and continuously thermally decomposed.

[0013] 1 is an explanatory diagram of a continuous organic matter thermal decomposition apparatus according to one embodiment of the present invention; FIG. 2 is an explanatory diagram of a vertical container and a discharge section of the continuous organic matter thermal decomposition apparatus shown in FIG. 1; FIG. 3 is an enlarged view of the discharge section of the continuous organic matter thermal decomposition apparatus shown in FIG. 1; FIG. 4 is an explanatory diagram of an agitator blade of a continuous organic matter thermal decomposition apparatus according to another embodiment of the present invention, where (a) shows a paddle-type agitator blade and (b) shows a gate-type agitator blade; and FIG. 5 is a photograph of organic matter residue obtained in the continuous discharge test of Example 1.

[0014] The continuous organic matter pyrolysis apparatus of the present invention is characterized by comprising an inlet for continuously feeding organic matter, a vertical vessel for storing the organic matter fed from the inlet, a stirring means for stirring the organic matter provided within the vertical vessel, a first heating means for heating the vertical vessel and pyrolyzing and gasifying the organic matter, an outlet connected to the top of the vertical vessel and equipped with an outlet path for drawing out pyrolysis gas of the organic matter, and a discharge unit connected to the bottom of the vertical vessel and equipped with an outlet path for continuously discharging organic residue. The continuous organic matter pyrolysis apparatus of the present invention is used in a state filled with a solid heat transfer medium.

[0015] The continuous organic matter pyrolysis apparatus of the present invention heats and pyrolyzes continuously fed organic matter while stirring it in a vertical vessel filled with a solid heat medium, and continuously discharges the organic residue, thereby preventing coking due to the organic residue in the vertical vessel and suppressing a decrease in heat conduction efficiency, thereby enabling efficient continuous pyrolysis of the organic matter. That is, the stirring of the solid heat medium in the vertical vessel prevents the adhesion of organic residue (carbonized matter) to the wall surface of the vertical vessel, and the continuous discharge of unnecessary organic residue prevents coking.

[0016] The organic matter to be treated in the present invention (input organic matter) is not particularly limited, and examples thereof 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 primarily composed of plastics separated from municipal solid waste or industrial waste, such as polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), and ABS. Furthermore, waste plastics may also contain impurities such as polyvinyl chloride (PVC), thermosetting resins containing chlorine as a component, FRP, and paper. Examples of waste rubber include synthetic rubber waste such as waste tires and natural rubber waste. The organic matter may be in various forms, such as fluff, beads, flakes, chips, granules, and pellets.

[0017] The configuration of the continuous organic matter pyrolysis apparatus of the present invention will be described in detail below. [Feeding section] The feeding section is a means for continuously feeding the organic matter to be treated, and is usually provided at the top of the vertical vessel and connected to a raw material feeding device. Specific examples include a raw material feeding hopper. Note that the concept of continuous feeding in the present invention includes not only the literal case of continuous feeding, but also intermittent feeding.

[0018] [Vertical Container] A vertical container is a long, vertical container that contains organic matter placed inside. The cross-sectional shape of a vertical container can be, for example, circular, elliptical, or polygonal. However, a circular shape is preferred due to its ability to prevent coking and ease of cleaning. Furthermore, the ratio of height to diameter (L / D) of the container is, for example, approximately 1 to 5, preferably 1 to 3. The vertical container may be inclined relative to the vertical direction, with the inclination angle being 0 to 45°, preferably 30° or less, more preferably 15° or less, even more preferably 5° or less, and particularly preferably 0° (vertical). As described above, this vertical container is filled with a solid heat transfer medium during the pyrolysis treatment. The amount of solid heat transfer medium filled in the vertical container is not particularly limited, and may be, for example, approximately 50 to 90% by volume. The solid heat transfer medium will be described later.

[0019] [Stirring Means] The stirring means is a means for stirring the organic matter contained in the vertical container together with the solid heat transfer medium. The stirring means is not particularly limited as long as it can stir the contents (organic matter and solid heat transfer medium). Examples of the stirring means include a rotating shaft installed vertically in the center of the vertical container and a stirring blade connected to the rotating shaft and rotating around the shaft. A stirring means capable of stirring the contents from bottom to top is preferred. By stirring the contents up with the stirring means, the contents are stirred more efficiently and uniformly. Since the organic matter is primarily pyrolyzed in the upper part of the vertical container (by contact with the solid heat transfer medium located at the top), efficient replacement of the solid heat transfer medium at the top allows for efficient pyrolysis. Two or more stirring means may be provided.

[0020] Examples of the type of stirring blade of the stirring means include ribbon type, paddle type, propeller type, turbine type, gate type, and anchor type. Since they can effectively stir up organic matter, single type and double ribbon type are preferred, and double ribbon type is more preferred.

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

[0022] The peripheral speed of the stirring blade is usually 0.1 m / s or more, 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 inside the vertical vessel are sufficiently stirred, and the thermal decomposition treatment of the organic matter can be carried out efficiently.

[0023] [First Heating Means] The first heating means is a means for heating the vertical container to pyrolyze and gasify the organic matter. 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. Examples of direct heating means include a burner installed inside the vertical container. Examples of indirect heating means include an electric heater or gas burner that heats the peripheral wall of the vertical container from the outside, and a means for introducing hot air or heat transfer oil into the external space of the vertical container. The internal temperature of the vertical container is typically about 350 to 550°C, and preferably about 400 to 450°C.

[0024] The outlet section is a means connected to the top of the vertical container and equipped with an outlet path for discharging the pyrolysis gas of the organic matter. The outlet path is connected to the lid or the side of the upper part of the vertical container, and guides the pyrolysis gas generated in the vertical container to a gas recovery device.

[0025] [Discharge Section] The discharge section is a means equipped with a discharge path connected to the bottom of the vertical vessel for continuously discharging organic residue. Continuously discharging the organic residue reduces the organic residue that accumulates in the vertical vessel and prevents the organic residue from increasing in the vertical vessel and causing poor stirring. This organic residue is discharged together with the solid heat transfer medium, mainly in the form of attached to the solid heat transfer medium or as powdered carbonized material.

[0026] The concept of continuous discharge in the present invention includes not only continuous discharge as literally stated, but also intermittent discharge. That is, the discharge amount can be controlled based on the amount of organic matter (and solid heat transfer medium) input, etc. For example, the discharge amount can be controlled by providing an on-off valve in the discharge path. Furthermore, the discharge amount can be controlled by the transfer speed of the transfer device described below.

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

[0028] The discharge part (discharge path) is not particularly limited as long as it is connected to the lower part of the upright vessel, and is preferably located below or to the side of the lower part of the upright vessel, and more preferably located below the lower part of the upright vessel. Since the organic matter inlet part is usually provided at the top of the upright vessel, by locating the discharge part at a position away from the inlet part, it is possible to discharge the organic matter residue in a state in which the organic matter is reliably pyrolyzed.

[0029] Specifically, a preferred embodiment of the discharge path is, for example, a gap formed between the inner surface of a cylindrical body connected to the bottom of the upright container, which tapers toward the bottom, and the outer surface of a spacer provided within the cylindrical body, which tapers toward the bottom. In this embodiment, the organic residue (and the solid heat transfer medium) in the upright container is discharged through an opening provided on the outer periphery of the bottom of the upright container, and after being stirred up by a stirring means provided in the center, is smoothly discharged by a flow that descends around the outer periphery.

[0030] The cylindrical body connected below the upright container may have a cross-sectional shape that is circular, elliptical, polygonal, or the like, similar to the upright container, with a circular shape being preferred. The cylindrical body may have an inner surface that tapers toward the bottom, and its outer shape may be a rectangular parallelepiped, cylindrical, inverted truncated cone, inverted cone, or the like.

[0031] The inclination angle of the inner surface of the cylinder (the inclination angle between the bottom surface of the upright container and the inner surface of the cylinder) is preferably 30 to 85°, more preferably 45 to 80°, and even more preferably 45 to 75°. By keeping the inclination angle within this range, the organic residue can be smoothly guided to the discharge outlet at the bottom.

[0032] The spacer provided in the cylinder, which forms the discharge passage together with the cylinder, is not particularly limited as long as its outer surface has a shape that tapers toward the bottom, and it is preferable that the inclination angle be the same as the inclination angle of the inner surface of the cylinder. Specifically, the outer shape of the spacer can be an inverted truncated cone 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. By having this gap size within this range, the organic residue can be smoothly guided to the outlet at the bottom.

[0034] The spacer preferably has a discharge path agitator on its inclined surface and is connected to a rotating shaft of an agitator mounted vertically in the center of the upright container, rotating about the shaft. This prevents clogging and retention of organic residue in the discharge path, enabling stable discharge. Specifically, the discharge path agitator can be a rod member mounted on the inclined surface of the spacer.

[0035] The organic residue discharged from the discharge section may be discharged by natural fall or the like from the discharge port at the bottom, but it is preferable that it be discharged assisted by power to prevent bridging. That is, the continuous organic matter pyrolysis apparatus of the present invention is preferably equipped with a transfer device connected to the discharge section. This makes it possible to adjust the discharge rate of the organic residue. Examples of the transfer device include a screw conveyor. In addition, the transfer device is preferably 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 path of the discharge section. The second heating means heats the discharged organic residue, ensuring pyrolysis of undecomposed organic matter. In particular, the cross-sectional area of ​​the discharge path (e.g., the gap between the cylinder and the spacer) is smaller than the cross-sectional area of ​​the vertical vessel, so that the thermal energy of the heating means is sufficiently transmitted to the organic matter passing through the discharge path, more reliably preventing undecomposed organic matter.

[0037] The second heating means may heat the discharge section to the same temperature as the upright container, but is preferably a means capable of heating the discharge section to a temperature higher than that of the upright container. For example, the temperature is preferably 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] 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 a means for introducing hot air into the external space of the discharge passage.

[0039] When the first heating means also serves as the second heating means, the heating means may be configured to provide a heating medium passage surrounding the upright container and the discharge section, and 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 upright container side, the discharge section side can be made to have a higher temperature.

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

[0041] The continuous organic matter pyrolysis method of the present invention is characterized by comprising a continuous feeding step of continuously feeding organic matter and a solid heat medium into a vertical vessel filled with a solid heat medium, a pyrolysis step of heating and stirring the organic matter and the solid heat medium fed into the vertical vessel in the continuous feeding step to pyrolyze the organic matter, and a continuous discharging step of continuously discharging the organic matter residue generated in the pyrolysis step together with a portion of the solid heat medium out of the vertical vessel.

[0042] According to the organic matter pyrolysis method of the present invention, organic matter is continuously fed into a vertical vessel filled with a solid heat transfer medium, heated and pyrolyzed while being stirred, and the organic residue is continuously discharged, thereby preventing coking of the vertical vessel due to the organic residue and suppressing a decrease in heat conduction efficiency, thereby enabling efficient and continuous pyrolysis of the organic matter. That is, the stirring of the solid heat transfer medium in the vertical vessel prevents the adhesion of organic residue (carbonized matter) to the wall surface of the vertical vessel, and the continuous discharge of unnecessary organic residue prevents coking.

[0043] The organic matter that can be used in the organic matter thermal decomposition method of the present invention can be the same as that used in the continuous organic matter thermal decomposition apparatus. In cases where the organic matter is the same as that used in the continuous organic matter thermal decomposition apparatus, the description will be omitted as appropriate.

[0044] [Continuous Charging Process] The continuous charging process is a process of continuously charging an organic material and a solid heat transfer medium into a vertical container filled with a solid heat transfer medium. Note that continuous charging is a concept that includes not only the literal case of continuous charging, but also intermittent charging. Furthermore, the organic material and the solid heat transfer medium may be charged simultaneously or separately. By this continuous charging process and continuous discharging process, the organic material and the solid heat transfer medium in the vertical container can be maintained at a constant ratio.

[0045] [Pyrolysis Step] The pyrolysis step is a step in which the organic matter and the solid heat transfer medium introduced into the vertical vessel in the continuous introduction step are heated and stirred to pyrolyze the organic matter. By heating and stirring the organic matter and the solid heat transfer medium, heat can be efficiently conducted to the organic matter, and coking due to organic matter residue in the vertical vessel can be prevented, maintaining high heat conduction efficiency, thereby enabling efficient pyrolysis of the organic matter. Furthermore, in order to perform pyrolysis more efficiently, it is preferable to stir and mix the organic matter and the solid heat transfer medium by scraping them up from the bottom to the top.

[0046] The amount of organic matter (undecomposed organic matter) fed into the solid heat transfer medium contained in the vertical container is 200 kg / h or less, preferably 1 to 100 kg / h, more preferably 1 to 50 kg / h, and particularly preferably 30 kg / h, per 100 L of volume of the solid heat transfer medium contained in the vertical container. By keeping the amount within this range, the organic matter can be efficiently pyrolyzed and the generation of undecomposed organic matter can be prevented. Furthermore, pyrolysis can be performed while maintaining a dry state inside the vertical container.

[0047] The ratio of organic matter (undecomposed organic matter) to the solid heat transfer medium discharged from the vertical vessel 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, the discharged material does not contain undecomposed organic matter, so that pyrolysis gas can be efficiently recovered.

[0048] The size of the solid heat transfer medium can be appropriately set depending on the type of organic material being added, but for example, the diameter is approximately 0.1 μm to 150 mm. Specifically, the solid heat transfer medium can be a powder or granule with a diameter of 0.1 μm to 1 mm, or a block with a diameter of more than 1 mm to approximately 15 mm. The shape of the solid heat transfer medium is not particularly limited, but from the viewpoint of improving fluidity, a spherical shape is preferred, a spherical shape close to a perfect sphere is more preferred, and a perfect sphere is particularly preferred. This can suppress agitation resistance due to the solid heat transfer medium and agitation resistance due to the precipitation of fine powder caused by abrasion between solid heat transfer mediums, and allows for the agitation motor and agitation blades to be made more compact. Changing the size of the solid heat transfer medium depending on the type of organic material facilitates separation of the discharged solid heat transfer medium and organic residue. Specifically, when the organic matter is waste plastic, powder particles with a diameter of about 0.1 μm to 1 mm can be suitably used, and when the organic matter is waste tires or the like that produce a large amount of charcoal deposition and it is desired to separate the charcoal from the solid heat transfer medium afterwards, lumps with a diameter of more than 1 mm to about 150 mm can be suitably used.

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

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

[0051] [Recovery Step] The recovery step is a step of recovering the pyrolysis gas generated in the pyrolysis step. The pyrolysis gas recovered in this step is separated into light hydrocarbon gases such as methane and other oil components, and then utilized.

[0052] [Continuous Discharge Step] The continuous discharge step is a step in which the organic residue generated in the pyrolysis step is continuously discharged from the vertical container together with a portion of the solid heat transfer medium. In this step, it is preferable to heat the discharged organic residue and the solid heat transfer medium. In addition, it is preferable that the heating temperature in this step is higher than the heating temperature in the pyrolysis step.

[0053] When the discharge section is heated, the residence time of the organic residue in the discharge section is preferably 10 minutes or more, more preferably 30 minutes or more, and even more preferably 60 minutes or more, which allows the proportion of undecomposed organic matter in the discharged organic residue to be 5 mass% or less.

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

[0055] The recycled organic matter recovery system of the present invention is characterized by comprising the above-mentioned continuous organic matter pyrolysis device, an organic matter feeding device that continuously feeds organic matter into the continuous organic matter pyrolysis device, and a gas recovery device that recovers the pyrolysis gas of the organic matter pyrolyzed in the continuous organic matter pyrolysis device.

[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]

[0023] Hereinafter, one embodiment of the continuous organic matter pyrolysis apparatus of the present invention will be described in detail with reference to the drawings. Here, Fig. 1 is an explanatory diagram of a continuous organic matter pyrolysis apparatus according to one embodiment of the present invention, Fig. 2 is an explanatory diagram of the vertical vessel and discharge section of the continuous organic matter pyrolysis apparatus shown in Fig. 1, and Fig. 3 is an enlarged view of the discharge section of the continuous organic matter pyrolysis apparatus shown in Fig. 1. Fig. 4 is an explanatory diagram of the stirring blades of a continuous organic matter 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 FIGS. 1 and 2 , a continuous organic matter pyrolysis apparatus 1 according to one embodiment of the present invention includes an input section 10 into which organic matter is continuously input, a vertical container 12 that stores the organic matter, a stirring means 14 that stirs the organic matter, a first heating means 16 that heats the vertical container 12 and pyrolyzes and gasifies the organic matter, an output section 18 that outputs pyrolysis gas of the organic matter, and a discharge section 20 that continuously discharges organic residue.

[0059] As shown in Figure 1, the input unit 10 is provided at the top of the vertical vessel 12 and is connected to a raw material input device. The outlet unit 18 is equipped with an outlet path 22 connected to the top of the vertical vessel 12 for discharging pyrolysis gases of organic matter. The outlet path 22 is connected to the lid of the vertical vessel 12 and guides the pyrolysis gases generated in the vertical vessel 12 to a gas recovery device.

[0060] 1 and 2, the vertical vessel 12 is a vertically long vessel capable of holding approximately 200 L of organic matter such as waste plastics and waste rubber fed into the feed section 10. During the pyrolysis treatment, the vertical vessel 12 is filled with approximately 70% by volume of a solid heat transfer medium.

[0061] As shown in Figures 1 and 2, the stirring means 14 is equipped with a rotating shaft 24 installed in the vertical direction at the center of the vertical container 12, and a double ribbon-type stirring blade 26 connected to the rotating shaft 24 and rotating around the axis, and is configured to be able to scrape up the contents from bottom to top.

[0062] As shown in FIG. 3 , the discharge section 20 includes a discharge channel 28 connected to the bottom of the upright vessel 12 for continuously discharging organic residue. The discharge channel 28 is formed by a gap of approximately 40 mm between the inner surface of a cylindrical body 30 connected to the bottom of the upright vessel 12, which tapers toward the bottom, and the outer surface of a spacer 32 provided within the cylindrical body 30, which also tapers toward the bottom. The discharge channel 28 is connected to an opening provided on the outer periphery of the bottom of the upright vessel 12. The cylindrical body 30 has a circular cross section shaped like an inverted truncated cone. The spacer 32 is also formed like an inverted truncated cone with an inclination angle of 60°, the same as the inclination angle of the inner surface of the cylindrical body 30. The spacer 32 is provided with a rod member 34 on its inclined surface as a discharge channel agitator, and is connected to the rotation shaft 24 of the agitator 14 provided vertically at the center of the upright vessel 12 and rotates around that axis.

[0063] 1, the continuous organic matter pyrolysis apparatus 1 is equipped with a first heating means 16 that heats the vertical vessel 12 and pyrolyzes and gasifies the organic matter. The first heating means 16 introduces hot air generated by a hot air generator 38 into a heating medium passage 36 that surrounds the vertical vessel 12 and the discharge section 20. The first heating means 16 also serves as a second heating means that heats the discharge channel 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 vessel 12 side. A baffle plate 40 is provided between the inlet and outlet to separate the outside of the vertical vessel 12 from the outside of the discharge section 20, allowing the discharge section 20 side to be heated to a higher temperature.

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

[0065] As shown in FIG. 4, in the continuous organic matter pyrolysis apparatus 1, a double ribbon type impeller 26 is used as the impeller of the stirring means 14, but other impellers such as a paddle type impeller (a) or a gate type impeller (b) may also be used.

[0066] Example 1 Continuous Discharge Test An analysis of organic residues continuously discharged using the continuous organic matter thermal decomposition apparatus and continuous organic matter thermal decomposition method of the present invention was carried out.

[0067] First, 70 L of spent FCC catalyst powder was filled into a 100 L vertical vessel. The vessel was heated to 450 °C, and the discharge channel of the discharge section was heated to 480 °C. After the heat was transferred throughout the vessel and stabilized, continuous processing began. Waste plastic was continuously fed at a rate of 30 L / h, and spent FCC catalyst was continuously fed into the vessel until the volume reached 70 L. Processing was performed so that the proportion of undecomposed waste plastic relative to the spent FCC catalyst remained at 3%. One hour after the start of continuous processing, 10 g of organic residue was extracted (Figure 5). Next, 10 g of the organic residue was calcined at 450 °C for one hour. The mass of each organic residue after calcination was measured. The results are shown in Table 1.

[0068]

[0069] As shown in Table 1, no difference in mass was observed before and after baking for 1 hour at 450°C. 450°C is the temperature at which oil vaporizes, but the lack of mass change indicates that the organic matter that becomes oil was completely thermally decomposed, with no organic residue remaining.

[0070] The thermal decomposition apparatus for organic matter of the present invention can be used to recover oil from organic matter such as waste plastics, and is therefore industrially useful.

[0071] DESCRIPTION OF SYMBOLS 1 Continuous organic matter pyrolysis device 10 Feeding section 12 Vertical vessel 14 Stirring means 16 First heating means (second heating means) 18 Discharge section 20 Discharge section 22 Discharge path 24 Rotating shaft 26 Double ribbon type stirring blade 28 Discharge path 30 Cylindrical body 32 Spacer 34 Rod member (discharge path stirring member) 36 Heating medium path 38 Hot air generator 40 Baffle plate 42 Cooling screw conveyor

Claims

1. A continuous organic matter pyrolysis apparatus comprising: an input section for continuously inputting organic matter; a vertical container for storing the organic matter input from the input section; a stirring means provided within the vertical container for stirring the organic matter; a first heating means for heating the vertical container and pyrolyzing and gasifying the organic matter; an outlet section connected to an upper part of the vertical container and equipped with an outlet path for discharging pyrolysis gas of the organic matter; and a discharge section connected to a lower part of the vertical container and equipped with an outlet path for continuously discharging organic matter residue.

2. A continuous organic matter thermal decomposition apparatus according to claim 1, further comprising a second heating means for heating the discharge passage of said discharge section.

3. A continuous organic matter thermal decomposition 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. A continuous organic matter thermal decomposition apparatus according to any one of claims 1 to 3, characterized in that the discharge passage of the discharge section is disposed below the lower part of the vertical vessel.

5. A continuous organic matter thermal decomposition apparatus according to any one of claims 1 to 3, characterized in that the discharge passage of the discharge section is arranged at the lower side of the vertical vessel.

6. A continuous organic matter pyrolysis apparatus according to any one of claims 1 to 3, characterized in that the discharge path of the discharge section is composed of a gap formed between the inner surface of a cylindrical body connected below the vertical container, which narrows toward the bottom, and the outer surface of a spacer provided within the cylindrical body, which narrows toward the bottom, and is connected to an opening provided on the outer periphery of the bottom of the vertical container.

7. A continuous organic matter pyrolysis apparatus according to any one of claims 1 to 3, characterized in that the stirring means comprises a rotating shaft installed vertically in the center of the vertical vessel, and stirring blades connected to the rotating shaft and rotating around the shaft.

8. A continuous organic matter thermal decomposition apparatus according to claim 7, wherein the stirring means is a means capable of stirring up the organic matter from the bottom to the top.

9. A continuous organic matter pyrolysis apparatus as described in claim 6, characterized in that the spacer is provided with a discharge path stirring member on its inclined surface and is connected to the rotating shaft of the stirring means installed vertically in the center of the vertical container, and rotates around that axis.

10. A continuous organic matter thermal decomposition method comprising: a continuous feeding step of continuously feeding organic matter and a solid heat medium into a vertical vessel filled with a solid heat medium; a pyrolysis step of heating and stirring the organic matter and the solid heat medium fed into the vertical vessel in the continuous feeding step to pyrolyze the organic matter; a recovery step of recovering pyrolysis gas generated in the pyrolysis step; and a continuous discharge step of continuously discharging organic matter residue generated in the pyrolysis step together with a portion of the solid heat medium out of the vertical vessel.

11. A continuous organic matter thermal decomposition method according to claim 10, wherein the discharged organic residue and solid heat transfer medium are heated in the continuous discharge step.

12. A continuous organic matter thermal decomposition method according to claim 11, characterized in that in the continuous discharge step, the discharged organic residue and solid heat transfer medium are heated at a temperature higher than the heating temperature in the thermal decomposition step.

13. A continuous organic matter thermal decomposition method according to any one of claims 10 to 12, characterized in that the organic matter and the solid heat transfer medium are continuously fed into the vertical vessel so that the amount of organic matter fed per 100 L of the solid heat transfer medium is in the range of 1 to 50 kg / h.

14. A continuous organic matter thermal decomposition method according to any one of claims 10 to 12, 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 thermal decomposition method according to any one of claims 10 to 12, 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 claims 10 to 12, characterized in that the organic matter fed in the continuous feeding step is waste plastic or waste rubber.

17. A continuous organic matter thermal decomposition method according to any one of claims 10 to 12, characterized in that the continuous organic matter thermal decomposition apparatus according to claim 1 is used.

18. A recycled organic matter recovery system comprising: a continuous organic matter pyrolysis apparatus according to any one of claims 1 to 3; an organic matter feeding device for continuously feeding organic matter into said continuous organic matter pyrolysis apparatus; and a gas recovery device for recovering pyrolysis gas from the organic matter pyrolyzed in said continuous organic matter pyrolysis apparatus.

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