Dry distillation pyrolysis oil production system and dry distillation pyrolysis oil production method

Abstract

To provide a dry distillation pyrolysis oil production system and a dry distillation pyrolysis oil production method that can easily recover residue remaining in a dry distillation retort after dry distillation and enable reuse of the residue.SOLUTION: A dry distillation pyrolysis oil production system comprises: a dry distillation retort 1 having a bottom portion located vertically downward, a protuberance rising vertically upward from the bottom portion, and a covering material disposed on the bottom portion and covering at least the protuberance, the dry distillation retort accommodating a material to be processed that is subjected to dry distillation pyrolysis; a pyrolysis unit 2 that heats the dry distillation retort and decomposes the material to be processed into residue and gas; a cooling unit 3 that cools the gas and condenses oil content contained in the gas; and a foreign matter removal unit 8 that removes a foreign matter from the residue.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a carbonization pyrolysis oilification system and a carbonization pyrolysis oilification method.

Background Art

[0002] A carbonization pyrolysis oilification system is conventionally known in which waste such as waste tires or plastics is heated to decompose into gas and residue, and the oil obtained by cooling and condensing the obtained gas is recovered (Patent Document 1).

[0003] In the carbonization pyrolysis oilification system as described above, for example, a carbonization kettle for accommodating waste tires is heated by a pyrolysis furnace to decompose the waste tires into carbide and carbonization gas. The carbide is reused as, for example, activated carbon, and the carbonization gas is recovered as oil by being cooled and condensed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the carbonization pyrolysis oilification system described in Patent Document 1, the residue remaining in the carbonization kettle after carbonization may adhere to the carbonization kettle, making it difficult to recover the residue from the carbonization kettle. Further, the residue contains foreign substances such as magnetic substances derived from waste tires. For this reason, the residue may not be reusable.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a carbonization pyrolysis oilification system and a carbonization pyrolysis oilification method capable of easily recovering the residue remaining in the carbonization kettle after carbonization and enabling reuse of the residue.

Means for Solving the Problem

[0007] In order to solve the above problems, according to one aspect of the present invention, there is provided a retort for accommodating a material to be carbonized and pyrolyzed, which has a bottom portion located vertically downward, a raised portion rising vertically upward from the bottom portion, and a covering material disposed on the bottom portion and covering at least the raised portion, and a carbonization and pyrolysis oilification system including a pyrolysis section for heating the retort and decomposing the material to be treated into residue and gas, a cooling section for cooling the gas and condensing the oil content contained in the gas, and a foreign matter removing section for removing foreign matter from the residue.

[0008] In order to solve the above problems, according to another aspect of the present invention, there is provided a carbonization and pyrolysis oilification method including a pyrolysis step of heating a material to be treated accommodated in a retort having a bottom portion located vertically downward, a raised portion rising vertically upward from the bottom portion, and a covering material disposed on the bottom portion and covering at least the raised portion, and decomposing the material to be treated into residue and gas, a cooling step of cooling the gas and condensing the oil content contained in the gas, and a foreign matter removing step of removing foreign matter from the residue.

Advantages of the Invention

[0009] As described above, according to the present invention, it is possible to provide a carbonization and pyrolysis oilification system and a carbonization and pyrolysis oilification method capable of easily recovering the residue remaining in the retort after carbonization and enabling reuse of the residue.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0011] Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. Note that the dimensions and scales of each part in the drawings are different from the actual ones. Also, the drawings may be schematically shown for easy understanding. Furthermore, the scope of the present invention is not limited to the embodiments exemplified below unless there is a description specifically limiting the present invention.

[0012] 1. Embodiment [Configuration of Carbonization Pyrolysis Oilification System] FIG. 1 is an explanatory diagram for explaining a configuration example of a carbonization pyrolysis oilification system (hereinafter, simply referred to as "oilification system 100") according to the present embodiment.

[0013] As shown in FIG. 1, the oilification system 100 includes a carbonization kettle 1, a pyrolysis unit 2, a cooling unit 3, a filtration unit 4, an intermediate tank 5, a small fuel tank 6, an operation panel 7, a magnetic separation device 8 (foreign matter removal unit), and a reversing device 9.

[0014] FIG. 2 is a cross-sectional view of the carbonization kettle 1 and the pyrolysis unit 2. In the description of FIG. 2, an X-axis, a Y-axis, and a Z-axis that are perpendicular to each other are defined. The X-axis, the Y-axis, and the Z-axis are three mutually perpendicular axial directions. As illustrated in FIG. 2, a direction along the X-axis as viewed from an arbitrary point is denoted as the X1 direction, and a direction opposite to the X1 direction is denoted as the X2 direction. The X-axis direction includes both the X1 direction and the X2 direction. Similarly, directions opposite to each other along the Y-axis as viewed from an arbitrary point are denoted as the Y1 direction and the Y2 direction. The Y-axis direction includes both the Y1 direction and the Y2 direction. Also, directions opposite to each other along the Z-axis as viewed from an arbitrary point are denoted as the Z1 direction (vertically downward) and the Z2 direction (vertically upward). The Z-axis direction includes both the Z1 direction and the Z2 direction. Furthermore, the X-Y plane including the X-axis and the Y-axis corresponds to the horizontal plane. The Z-axis is an axis along the vertical direction.

[0015] The carbonization kettle 1 includes a carbonization kettle body 11, a lid 12, and a coating material 18. As shown in FIG. 2, the carbonization kettle body 11 is housed in the exterior 23 of the pyrolysis section 2. The carbonization kettle body 11 houses waste tires (objects to be processed) and has a bottom 111. The bottom 111 faces the bottom 25 in the Z-axis direction when the carbonization kettle 1 is housed in the exterior 23 and is located vertically below the carbonization kettle body 11. The bottom 111 has a raised portion 112. The raised portion 112 is provided at the center of the bottom 111 in the X-axis direction and bulges in the Z2 direction. As shown in FIG. 2, the raised portion 112 faces the raised portion 26 of the pyrolysis section 2 in the Z-axis direction.

[0016] The carbonization kettle 1 according to the present embodiment is a replaceable large cartridge-type carbonization and oilification kettle. As a result, it is not necessary to chip the waste tires, and the waste tires can be directly put into the carbonization kettle 1 for carbonization and pyrolysis.

[0017] In the present embodiment, as shown in FIG. 2, when the carbonization kettle 1 is housed in the exterior 23, a flow path 27 is formed between the inner peripheral surface of the exterior 23 around the Z-axis and the inner peripheral surface of the carbonization kettle body 11 around the Z-axis, and between the outer surface of the bottom 111 facing the Z1 direction and the inner surface of the bottom 25 facing the Z2 direction. The flow path 27 functions as a flow path for hot air from the burner 21 and communicates with the flue 28.

[0018] The hot air from the burner 21 flows into the fire chamber 22 and then into the flow path 27 through a plurality of through holes 24 from the fire chamber 22. The hot air flowing into the flow path 27 is guided to the flue 28 and discharged outside the pyrolysis section 2. By flowing the hot air from the burner 21 as described above, the carbonization kettle 1 is heated. Here, the carbonization kettle 1 according to the present embodiment has a raised portion 112 as shown in FIG. 2, so that the surface area of the surface of the bottom 111 facing the Z2 direction is larger than that in the case where the raised portion 112 is not provided. As a result, the waste tires can be heated more efficiently than in the case where the raised portion 112 is not provided. In FIG. 2, the flow of the hot air from the burner 21 is indicated by solid arrows.

[0019] The lid 12 covers the carbonization kettle body 11 in the Z1 direction and has a tar separator 13, a partition wall 14, an extraction passage 16, and a main globe valve 17 provided at the end of the extraction passage 16.

[0020] The tar separator 13 has a plurality of perforated plates. The plurality of perforated plates are provided at intervals in the Z-axis direction. The plurality of through holes of each of the plurality of perforated plates are arranged so as not to overlap each other when viewed in the Z-axis direction.

[0021] The partition wall 14 connects the back surface of the lid 12 and the tar separator 13. The partition wall 14 has a function of inhibiting the inflow of gas from the carbonization kettle body 11 that does not flow into the tar separator 13 into the extraction passage 16 and guiding the oil droplets that have fallen from the back surface of the lid 12 to the tar separator 13. The gas that has passed through the tar separator 13 and flowed into the gas chamber 15 is guided to the extraction passage 16. The gas flows into the cooling unit 3 through the extraction passage 16.

[0022] As shown in FIG. 2, the coating material 18 is provided on the bottom portion 111 and covers at least the raised portion 112 in the Z1 direction. The coating material 18 is not limited to the configuration shown in the figure, and may cover the entire inner surface of the bottom portion 111 facing the Z2 direction. The coating material 18 is typically a wire mesh made of metal, but is not limited thereto, and its configuration, shape, etc. are not particularly limited as long as it can prevent the residue remaining in the carbonization kettle 1 after carbonization from adhering to the bottom portion 111.

[0023] The material constituting the coating material 18 is not particularly limited, but from the viewpoint of efficiently transferring the heat from the burner 21 to the waste tires accommodated in the carbonization kettle body 11, it is preferably made of a material having high thermal conductivity. Specifically, the coating material 18 is made of iron, for example.

[0024] As shown in FIG. 2, the pyrolysis unit 2 has an exterior 23, a bottom portion 25, a plurality of through holes 24, a raised portion 26, a burner 21, and a fire chamber 22. The pyrolysis unit 2 decomposes the waste tires accommodated in the carbonization kettle 1 into residue and gas by heating the waste tires.

[0025] The outer casing 23 is a cylindrical body made of a heat insulating material and houses the retort body 11 of the retort 1. The bottom portion 25 is provided inside the outer casing 23 and is configured in a disc shape. The bottom portion 25 is integrally formed with the inner peripheral surface of the outer casing 23. Each of the plurality of through holes 24 is provided at intervals in the X-axis direction as shown in FIG. 2 and penetrates the bottom portion 25 in the Z-axis direction. The raised portion 26 bulges in the Z2 direction from the center in the X-axis direction of the bottom portion 25 and is integrally formed with the bottom portion 25. The combustion chamber 22 is a space defined by the bottom portion 25, the burner 21, and the portion vertically below the outer casing 23.

[0026] Returning to FIG. 1, the cooling section 3 includes a primary cooler 31, a secondary cooler 32, and an oil-water separation tank 34. The cooling section 3 cools the gas flowing in from the pyrolysis section 2 and condenses the oil contained in the gas to form oil.

[0027] The primary cooler 31 has a plurality of water pipes (not shown). The plurality of water pipes cool the gas flowing in from the pyrolysis section 2 and condense the oil contained in the gas to form oil. The primary cooler 31 sends the oil to the oil-water separation tank 34.

[0028] The secondary cooler 32 has a plurality of water pipes (not shown). The plurality of water pipes cool the gas flowing in from the primary cooler 31 and condense the oil contained in the gas that could not be completely condensed by the primary cooler 31 to form oil. The secondary cooler 32 sends the oil to the oil-water separation tank 34.

[0029] The oil-water separation tank 34 separates and removes the water contained in the oil sent from the primary cooler 31 and the secondary cooler 32. The oil-water separation tank 34 sends the oil from which the water has been removed to the filtration section 4.

[0030] The filtration unit 4 includes a filtration device 41 and a preliminary filtration device 42. The filtration device 41 filters the oil sent from the oil-water separation tank 34 and removes a large amount of carbon particles contained in the oil. The filtration device 41 sends the oil from which the carbon particles have been removed to the relay tank 5. The preliminary filtration device 42 is configured in the same way as the filtration device 41 and has the same function as the filtration device 41. The preliminary filtration device 42 is used as a backup for the filtration device 41 when the filtration performance of the filtration device 41 deteriorates.

[0031] The relay tank 5 functions as a buffer tank that temporarily stores the oil sent from the filtration unit 4, and sends the oil to the small fuel tank 6 and a storage tank (not shown).

[0032] The small fuel tank 6 functions as a buffer tank that temporarily stores the oil sent from the relay tank 5, and supplies the oil to the burner 21. The burner 21 uses the oil supplied from the small fuel tank 6 as fuel for heating the retort 1.

[0033] The operation panel 7 is electrically connected to the pyrolysis unit 2 and the burner 21, and controls the burner 21. Specifically, for example, the operation panel 7 is electrically connected to a temperature sensor (not shown) provided in the retort 1. The operation panel 7 detects the temperature of the heated waste tire based on the detection signal from the temperature sensor, and adjusts the heating amount of the burner 21 so that the temperature falls within a predetermined temperature range.

[0034] The magnetic separation device 8 includes a magnetic separator 81, an electromagnetic separator 82, and a crusher 83. The magnetic separator 81 removes iron wires from the residue remaining in the retort 1 after pyrolysis, and separates the residue into iron wires and first carbides. The iron wires are recovered and effectively utilized as, for example, iron-making materials. The first carbides are recovered and supplied to the crusher 83. The first carbides are carbides from which iron wires have been removed from the residue recovered from the retort 1 after pyrolysis, and contain magnetic substances derived from waste tires.

[0035] The crusher 83 crushes the first carbide into particles with a particle size of, for example, 30 μm or 60 μm. These particles are supplied to the electromagnetic separator 82. The electromagnetic separator 82 removes the magnetic substance from the particles with a particle size of, for example, 30 μm or 60 μm and separates the particles into a magnetic substance and a second carbide. The second carbide is recovered and effectively used as a raw material for, for example, carbon black or activated carbon. The second carbide is carbide particles from which the magnetic substance has been removed from the first carbide.

[0036] As shown in FIG. 1, the inversion device 9 sandwiches the retort 1 after carbonization from the left and right and inverts the retort 1 by 180°. Thereby, the residue remaining in the retort 1 after carbonization is supplied to the magnetic separator 81.

[0037] As can be understood from the above description, the oilification system 100 according to the present embodiment has a bottom portion 111 located vertically below, a raised portion 112 that rises vertically upward from the bottom portion 111, and a covering material 18 disposed on the bottom portion 111 and covering at least the raised portion 112, and includes a retort 1 that houses waste tires to be carbonized and pyrolyzed, a thermal decomposition unit 2 that heats the retort 1 and decomposes the waste tires into residues and gas, a cooling unit 3 that cools the gas and condenses the oil content contained in the gas, and a magnetic separation device 8 that removes foreign substances from the residues.

[0038] According to the above aspect, by providing the covering material 18 on the bottom portion 111 of the retort 1, it is possible to prevent residues from adhering to the bottom portion 111. Thereby, it becomes easy to recover the residue from the retort 1 after carbonization. Further, since foreign substances contained in the residue are removed by the magnetic separation device 8, it is possible to reuse the carbide, which is the residue from which the foreign substances have been removed, as a raw material for, for example, carbon black or activated carbon. Therefore, according to the present invention, by providing the retort 1 having the covering material 18 and the magnetic separation device 8 in the oilification system 100, it is possible to easily recover the residue remaining in the retort 1 after carbonization and to reuse the residue.

[0039] [Carbonization and Pyrolysis Oilification Method] Next, an example of the carbonization pyrolysis oilification method according to the present embodiment will be described with appropriate reference to FIG. 3. FIG. 3 is a flowchart showing an example of the carbonization pyrolysis oilification method executed by the oilification system 100. As illustrated in FIG. 3, the oilification system 100 executes a pyrolysis process (step St1), a cooling process (step St2), a filtration process (step St3), and a magnetic separation process (step St4).

[0040] (Step St1: Pyrolysis Process) An operator of the oilification system 100 puts waste tires into the retort 1 and sets the retort 1 into which the waste tires are put in the pyrolysis section 2. Next, the operator ignites the burner 21 by operating the operation panel 7 and controls the heating amount of the burner 21 so that the pyrolysis section 2 heats the retort 1 to, for example, 500°C or higher and 700°C or lower.

[0041] Thereby, the waste tires put into the retort 1 are heated to, for example, 400°C or higher and 500°C or lower and pyrolyzed into gas and residue. The gas rises vertically upward, passes through a plurality of perforated plates of the tar separator 13, and reaches the back surface of the lid 12. When the gas reaches the back surface of the lid 12, the gas is cooled into oil droplets and falls into the tar separator 13. At this time, the gas passes through a plurality of perforated plates of the tar separator 13, and impurities such as tar contained in the gas adhere to the perforated plates and are removed. The gas with less of such impurities is sent to the gas chamber 15. Further, the impurities such as tar adhering to the perforated plates are washed away by the oil droplets that have fallen into the above-described tar separator 13 and fall into the retort 1. Such rising of the gas, removal of impurities, and falling of the oil droplets are repeated, and the gas containing an oil component with less impurities such as tar flows into the extraction path 16. In the present embodiment, by controlling the heating temperature of the waste tires put into the retort 1 to, for example, 400°C or higher and 500°C or lower by the operation panel 7, the oil component can be removed from the waste tires in several hours.

[0042] (Step St2: Cooling Process) The gas containing oil with less impurities such as tar, which has flowed into the extraction path 16, flows into the primary cooler 31 and is cooled. The oil contained in the gas flowing into the primary cooler 31 is condensed by the primary cooler 31 to become oil and is sent to the oil-water separation tank 34. The gas containing the oil that could not be completely condensed by the primary cooler 31 flows from the primary cooler 31 into the secondary cooler 32 and is further cooled. The oil is condensed by the secondary cooler 32 to become oil and is sent to the oil-water separation tank 34. The oil-water separation tank 34 separates and removes the moisture contained in the oil sent from the primary cooler 31 and the secondary cooler 32. The oil-water separation tank 34 sends the oil from which the moisture has been removed to the filtration section 4.

[0043] (Step St3: Filtration process) The oil sent from the cooling section 3 to the filtration section 4 has impurities such as carbon particles removed by passing through the filtration device 41. The oil from which the impurities have been removed by the filtration device 41 is supplied to the relay tank 5 and temporarily stored. The oil stored in the relay tank 5 is supplied to the storage tank and the small fuel tank 6. The oil supplied to the storage tank is stored and reused, for example, as waste plastic pyrolysis oil type 2 (equivalent to A heavy oil type 1 No. 2).

[0044] (Step St4: Magnetic separation process (foreign matter removal process)) Next, the operator of the oilification system 100 takes out the retort 1 after carbonization from the pyrolysis section 2 and sets the retort 1 in the inversion device 9. As shown in FIG. 2, the inversion device 9 inverts the retort 1 by 180° and puts the residue remaining in the retort 1 after carbonization into the magnetic separator 81. In step St4, when the retort 1 is inverted by 180°, the residue remaining in the retort 1 after carbonization falls by gravity and can be put into the magnetic separator 81 without leaving the residue at the bottom 111. In particular, in the present embodiment, as shown in FIG. 2, since the covering material 18 is provided at the bottom 111 of the retort 1 to prevent the residue from sticking to the bottom 111, the residue remaining in the retort 1 after carbonization is smoothly put into the magnetic separator 81.

[0045] The magnetic separator 81 removes iron wires from the residue supplied from the retort 1 after carbonization. The first carbide obtained by the magnetic separator 81 removing the iron wires from the residue is supplied to the crusher 83.

[0046] The crusher 83 crushes the first carbide into particles with a particle size of, for example, 30 μm or 60 μm. The particles are supplied to the electromagnetic separator 82. The electromagnetic separator 82 removes magnetic substances from the particles with a particle size of, for example, 30 μm or 60 μm, and separates the particles into magnetic substances and the second carbide. The second carbide is recovered and effectively used as a raw material for, for example, carbon black or activated carbon.

[0047] As described above, in step St4, the iron wires contained in the residue recovered from the retort 1 after carbonization are removed by the magnetic separator 81. Thereby, the iron wires can be reused. Further, since the magnetic substances contained in the first carbide, which is the residue from which the iron wires have been removed, are removed by the electromagnetic separator 82, the second carbide, which is the residue from which the iron wires and magnetic substances have been removed, can also be reused. That is, by the oilification system 100 executing step St4 in addition to the above steps St1 to 3, iron wires and magnetic substances are removed from the residue recovered from the retort 1 after carbonization. Thereby, the second carbide, which is the residue from which the iron wires and magnetic substances have been removed, can be reused as a raw material for, for example, carbon black or activated carbon, and further, the removed iron wires can also be reused.

[0048] As described above, in the carbonization pyrolysis oilification method according to the present embodiment, the waste tire accommodated in the retort 1 having the bottom 111 located vertically below, the raised portion 112 rising vertically upward from the bottom 111, and the covering material 18 disposed on the bottom 111 and covering at least the raised portion 112 is heated, and a pyrolysis step (step St1) of decomposing the waste tire into a residue and a gas, a cooling step (step St2) of cooling the gas and condensing the oil component contained in the gas, and a magnetic separation step (step St4) of removing foreign substances from the residue are executed.

[0049] According to the above aspect, by providing the coating material 18 at the bottom 111 of the retort 1, it is possible to prevent residues from adhering to the bottom 111. As a result, it becomes easier to recover the residues from the retort 1 after carbonization. Further, since the iron wires and magnetic substances contained in the residues are removed by the magnetic separation step (step St4), carbides, which are residues with the iron wires and magnetic substances removed, can be reused as raw materials for, for example, carbon black or activated carbon. Therefore, according to the carbonization pyrolysis oilification method of the present invention, by providing the coating material 18 at the bottom 111 of the retort 1 and performing the magnetic separation step (step St4), it is possible to easily recover the residues remaining in the retort 1 after carbonization and to reuse the residues.

[0050] 2. Supplementary As described above, the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that those having ordinary knowledge in the technical field to which the present invention pertains can conceive of various modification examples or correction examples within the scope of the technical idea described in the claims, and it is naturally understood that these also belong to the technical scope of the present invention.

[0051] For example, in the carbonization pyrolysis oilification system and the carbonization pyrolysis oilification method exemplified in the above embodiment, waste tires are carbonized and pyrolyzed as the object to be treated, but the present invention is not limited thereto, and objects to be treated different from waste tires may be carbonized and pyrolyzed, and the use of the present invention is not particularly limited.

[0052] Furthermore, the effects described in this specification are merely illustrative or exemplary and not restrictive. That is, the present invention may exhibit other effects obvious to those skilled in the art from the description of this specification together with or instead of the above effects.

[0053] 3. Supplementary Note The following aspects can be understood from the forms exemplified above.

[0054] The carbonization pyrolysis oil conversion system according to one aspect (Aspect 1) of the present invention has a bottom portion located vertically below, a raised portion that rises vertically upward from the bottom portion, and a covering material disposed on the bottom portion and covering at least the raised portion, and includes a carbonization kettle that houses an object to be carbonization pyrolyzed, a pyrolysis unit that heats the carbonization kettle and decomposes the object to be processed into residue and gas, a cooling unit that cools the gas and condenses the oil content contained in the gas, and a foreign matter removal unit that removes foreign matter from the residue.

[0055] According to Aspect 1, by providing a covering material on the bottom of the carbonization kettle, it is possible to prevent residue from adhering to the bottom. As a result, it becomes easy to recover the residue from the carbonization kettle after carbonization. Further, since foreign matter contained in the residue is removed by the foreign matter removal unit, the residue from which the foreign matter has been removed can be reused. Therefore, according to Aspect 1, by providing the carbonization pyrolysis oil conversion system with a carbonization kettle having a covering material and a foreign matter removal unit, the residue remaining in the carbonization kettle after carbonization can be easily recovered, and the residue can be reused.

[0056] According to a specific example (Aspect 2) of Aspect 1, the foreign matter removal unit is a magnetic separation device that removes magnetic substances from the residue. According to Aspect 2, since the magnetic substances contained in the residue are removed by the magnetic separation device, the residue from which the magnetic substances have been removed can be reused.

[0057] According to a specific example (Aspect 3) of Aspect 2, the magnetic separation device includes a magnetic separator and an electromagnetic separator. The magnetic separator removes iron wires from the residue, and the electromagnetic separator removes magnetic substances from the residue from which the iron wires have been removed. According to Aspect 3, the iron wires contained in the residue recovered from the retort after carbonization are removed by a magnetic separator. Thereby, the iron wires can be reused. Further, since the magnetic substances contained in the residue from which the iron wires have been removed are removed by an electromagnetic separator, the residue from which the iron wires and magnetic substances have been removed can also be reused. That is, according to Aspect 3, the iron wires and magnetic substances are removed from the residue recovered from the retort after carbonization. Thereby, the residue from which the iron wires and magnetic substances have been removed can be reused, and furthermore, the removed iron wires can also be reused.

[0058] According to a specific example (Aspect 4) of any one of Aspects 1 to 3, the coating material is a wire mesh made of metal.

[0059] The carbonization pyrolysis oil conversion method according to one aspect (Aspect 5) of the present invention heats an object to be treated accommodated in a retort having a bottom portion located vertically below, a raised portion rising vertically upward from the bottom portion, and a coating material disposed on the bottom portion and covering at least the raised portion, and decomposes the object to be treated into a residue and a gas; a cooling step of cooling the gas and condensing the oil content contained in the gas; and a foreign matter removing step of removing foreign matter from the residue.

[0060] According to Aspect 5, by providing the coating material on the bottom of the retort, it is possible to prevent the residue from sticking to the bottom. Thereby, it becomes easy to recover the residue from the retort after carbonization. Further, since the foreign matter contained in the residue is removed by the foreign matter removing unit, the residue from which the foreign matter has been removed can be reused. Therefore, according to Aspect 5, by providing the coating material on the bottom of the retort and performing the foreign matter removing step, it is possible to easily recover the residue remaining in the retort after carbonization and to reuse the residue.

[0061] According to a specific example (Aspect 6) of Aspect 5, in the foreign matter removing step, magnetic substances are removed from the residue. Thereby, the residue from which the magnetic substances have been removed can be reused.

[0062] According to a specific example of Embodiment 6 (Embodiment 7), in the foreign matter removal step, iron wires are removed from the residue, and magnetic substances are removed from the residue from which the iron wires have been removed. According to Embodiment 7, iron wires contained in the residue recovered from the retort after carbonization are removed. Thereby, the iron wires can be reused. Further, since magnetic substances contained in the residue from which the iron wires have been removed are removed, the residue from which the iron wires and magnetic substances have been removed can also be reused. That is, according to Embodiment 7, iron wires and magnetic substances are removed from the residue recovered from the retort after carbonization. Thereby, the residue from which the iron wires and magnetic substances have been removed can be reused, and furthermore, the removed iron wires can also be reused.

Explanation of Signs

[0063] 1…Retort 2…Pyrolysis section 3…Cooling section 8…Magnetic separation device (foreign matter removal section) 18…Coating material 81…Magnetic separator 82…Electromagnetic separator 100…Carbonization pyrolysis oilification system 111…Bottom of retort 112…Bulge of retort

Claims

1. A carbonization kettle having a bottom portion located vertically below, a raised portion that rises vertically upward from the bottom portion, and a covering material disposed on the bottom portion that covers at least the raised portion, and that houses a material to be carbonized and pyrolyzed; A pyrolysis section that heats the carbonization kettle and decomposes the material to be processed into a residue and gas; A cooling section that cools the gas and condenses the oil content contained in the gas; A foreign matter removal section that removes foreign matter from the residue A carbonization pyrolysis oilification system comprising the above.

2. The foreign matter removal section is a magnetic separation device that removes magnetic substances from the residue, The carbonization pyrolysis oilification system according to Claim 1.

3. The magnetic separation device includes a magnetic separator and an electromagnetic separator, The magnetic separator removes iron wires from the residue, The electromagnetic separator removes magnetic substances from the residue from which the iron wires have been removed, The carbonization pyrolysis oilification system according to Claim 2.

4. The covering material is a wire mesh made of metal, The carbonization pyrolysis oilification system according to any one of Claims 1 to 3.

5. A carbonization process of heating a material to be processed housed in a carbonization kettle having a bottom portion located vertically below, a raised portion that rises vertically upward from the bottom portion, and a covering material disposed on the bottom portion that covers at least the raised portion, and decomposing the material to be processed into a residue and gas; A cooling process of cooling the gas and condensing the oil content contained in the gas; A foreign matter removal process of removing foreign matter from the residue A carbonization pyrolysis oilification method including the above.

6. In the foreign matter removal process, magnetic substances are removed from the residue, The carbonization pyrolysis oilification method according to Claim 5.

7. In the foreign matter removal step, an iron wire is removed from the residue, and a magnetic substance is removed from the residue from which the iron wire has been removed. The carbonization pyrolysis oilification system according to claim 6.

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