Waste tire treating apparatus and method using superheated steam

Abstract

This waste tire treating apparatus is provided with: a superheated steam generating unit 1, 1'; a thermal decomposition chamber 3 provided below the superheated steam generating unit 1, 1' for thermally decomposing waste tires T by means of superheated steam Q from the superheated steam generating unit; and a liquefaction unit 4 for liquefying a dry-distilled gas G from the thermal decomposition chamber 3 to extract an oil component or the like.

Description

Waste tire processing device and method using superheated steam

[0001] The present invention relates to a waste tire processing device and method using superheated steam.

[0002] Scrap tires are a valuable resource that contains a lot of oil derived from natural rubber and crude oil. Therefore, in Japan, about 20% of scrap tires are recycled as recycled rubber, rubber crumb, or recycled tires, and the remaining majority, or about 65%, is used for heat. For this heat utilization, exhaust gases such as CO2 and CO2 are emitted during the cutting, shredding, and combustion of scrap tires. ２ The environmental impact of the above is not desirable. For these reasons, there is a demand for a waste tire processing device that can efficiently recycle oil and other components from waste tires.

[0003] To recycle oil and other components from scrap tires, conventional scrap tire processing devices include a crushing unit for crushing the scrap tires (see Patent Document 1), a pyrolysis unit consisting of an electric furnace or the like (e.g., an externally heated rotary kiln) for pyrolyzing the scrap tires, and a cooling unit for cooling the pyrolysis gas to condense and recover the oil and other components (see Patent Document 2). Furthermore, when the scrap tires are large, a cutting unit for cutting the tires into two or more parts is provided to improve crushing efficiency (see Patent Document 1). Furthermore, a bead wire removal unit for removing bead wires in advance is provided to improve crushing efficiency (see Patent Document 3).

[0004] JP 2023-85858 A JP 2008-69191 A (Patent No. 4644172 A) JP 2003-220610 A

[0005] However, the above-mentioned conventional waste tire processing equipment has a problem that the manufacturing cost is high and the processing time is long because a shredding unit, which requires a cutting unit and a bead wire removal unit as well, is provided in the preceding stage as needed. Furthermore, the electric furnace for pyrolysis has a small thermal decomposition capacity, which further increases the processing time.

[0006] In order to solve the above-mentioned problems, the waste tire processing device of the present invention comprises a superheated steam generating unit, a pyrolysis chamber provided below the superheated steam generating unit for pyrolyzing waste tires using the superheated steam from the superheated steam generating unit, and a liquefaction unit that liquefies the dry distillation gas from the pyrolysis chamber to extract oil components, etc.

[0007] In addition, the waste tire processing method of the present invention includes a waste tire storing step of storing waste tires in a bucket, an infeed conveyor setting step of setting the bucket on an infeed conveyor after the waste tire storing step, a first bucket moving step of moving the bucket from the infeed conveyor to a pyrolysis conveyor of a pyrolysis chamber, a pyrolysis / pyrolysis gas liquefaction and recovery step of pyrolyzing the waste tires with superheated steam in the pyrolysis chamber and liquefying and recovering the pyrolysis gas produced by the pyrolysis after the first bucket moving step, a second bucket moving step of moving the bucket onto a slow-cooling conveyor of a slow-cooling chamber after the pyrolysis / pyrolysis gas liquefaction and recovery step, a slow-cooling step of slowly cooling the waste tires after the second bucket moving step, and a wire / residue recovery step of recovering wire / residue of the waste tires after the slow-cooling step.

[0008] According to the present invention, superheated steam with unparalleled thermal energy, obtained by further heating saturated steam at approximately 100°C, is used without using fossil fuels. Therefore, scrap tires can be pyrolyzed without cutting, removing bead wires, or crushing. This reduces production costs, improves processing efficiency, and shortens processing time. Furthermore, because superheated steam has a lower oxygen content than saturated steam, thermally treated products such as water and dry distillation gases are not oxidized or burned, and no exhaust gas is generated. Therefore, oil extraction and other processes can be performed efficiently, further shortening processing time.

[0009] 1 is a top view showing an embodiment of a waste tire processing device according to the present invention. FIG. 2 is a front view of the waste tire processing device of FIG. 1. FIG. 3 is a right side view of the waste tire processing device of FIG. 1. FIG. 4 is a flowchart for explaining the operation of the waste tire processing device of FIG. 1. FIG. 5 is a detailed flowchart of the operation of the pyrolysis chamber of FIG. 4. FIG. 6 shows a first example of the superheated steam generating unit of FIG. 1, where (A) is a top view, (B) is a cross-sectional view taken along line B-B of (A), and (C) is a cross-sectional view taken along line C-C of (A). FIG. 7 shows details of the insulator structure of FIG. 6, where (A) is a bottom view and (B) is a cross-sectional view. FIG. 8 shows a second example of the superheated steam generating unit of FIG. 1, where (A) is a cross-sectional view and (B) is a cross-sectional view taken along line B-B of (A).

[0010] FIG. 1 is a top view showing an embodiment of a waste tire processing device according to the present invention, FIG. 2 is a front view of the waste tire processing device of FIG. 1, and FIG. 3 is a right side view of the waste tire processing device of FIG.

[0011] 1, 2, and 3, a saturated steam generating unit 2 for supplying saturated steam is connected to a superheated steam generating unit 1. The saturated steam generating unit 2 heats hot water, for example, at about 80°C, to generate saturated steam P at about 100°C to 120°C for the superheated steam generating unit 1, and is relatively small and electrically driven. An example of the saturated steam generating unit 2 is a light boiler manufactured by Nakamoto Corporation, model number trademark NBC2101R. The saturated steam P from the saturated steam generating unit 2 is supplied to a saturated steam inlet 11a of the superheated steam generating unit 1 via a solenoid valve (not shown). Note that 11b is a closed end.

[0012] The superheated steam generating unit 1 supplies superheated steam Q having a temperature of 700° C. to 800° C. or 1000° C. to 1600° C., which is higher than the temperature of the saturated steam P, to the pyrolysis chamber 3. The structure of the superheated steam generating unit 1 will be described later.

[0013] A pyrolysis gas outlet 3a for extracting pyrolysis gas G is provided at the top of the pyrolysis chamber 3, and is connected via a filter 3b to a liquefaction unit 4 for liquefying and recovering the pyrolysis gas G. The liquefaction unit 4 is composed of, for example, a cyclone, a hot water heat exchanger, and a liquefaction heat exchanger. The oil and the like recovered by the liquefaction unit 4 are stored in a crude oil tank 5.

[0014] In the pyrolysis chamber 3, the top, bottom, and sides are made of heat insulating material 31, and the inlet and outlet sides for the waste tires are closed by an inlet-side insulating shutter 32 and an outlet-side insulating shutter 33, so that the pyrolysis chamber 3 forms an airtight rectangular insulating structure.

[0015] The oxygen concentration dissolved in normal water at room temperature is approximately 0.6%. When water is converted into saturated steam, its volume increases by 1600 times. Therefore, the oxygen concentration in the superheated steam Q in the pyrolysis chamber 3 is 0.1-0.2%, resulting in a nearly oxygen-free state in the pyrolysis chamber 3. Therefore, even if the waste tires T are heated by the superheated steam Q at temperatures between 700°C and 800°C or between 1000°C and 1600°C, they are not oxidized or burned, but are instantly decomposed and rendered harmless. This decomposition is called pyrolysis. The heat transfer from the superheated steam Q to the waste tires T at this time is achieved by convection heat transfer as well as the most distinctive condensation heat transfer effect, which allows the superheated steam Q to act as thermal energy with high thermal efficiency. The condensation heat transfer effect refers to the fact that when the temperature of the waste tires T being heat-treated is lower than 100°C, the superheated steam Q condenses on the waste tires T, providing a large amount of condensation heat, resulting in a condensation temperature of 100°C. Therefore, the waste tires T experience a temperature rise similar to that seen when heated in boiling water. The amount of condensation increases as the temperature of the waste tires T decreases, and condensation continues until the temperature of the waste tires T reaches 100° C. In this superheated steam treatment, the temperature of the waste tires T reaches 700° C. in a short time, and when the decreasing rate drying rate period begins, the temperature of the waste tires T begins to rise above 100° C.

[0016] No chamber is provided on the inlet side of the pyrolysis chamber 3, but an annealing chamber 6 having an outlet-side heat-insulating shutter 61 is provided on the outlet side of the pyrolysis chamber 3.

[0017] When treating the waste tires T, buckets B are prepared for vertically placing a plurality of waste tires T, and the waste tire thermal treatment progresses as the buckets B move from the entrance side of the pyrolysis chamber 3 to the exit side of the pyrolysis chamber 3. For this purpose, an inlet conveyor 71 is provided at the entrance side of the pyrolysis chamber 3 for moving two buckets B containing waste tires T before treatment, and a pyrolysis conveyor 72 is provided in the pyrolysis chamber 3 for moving two buckets B containing waste tires T under treatment, and further, a slow-cooling conveyor 73 is provided in the slow-cooling chamber 6 for moving two buckets B containing treated waste tires T.

[0018] The control unit 8, which includes a power supply, controls the entire waste tire processing apparatus. That is, the control unit 8 is a computer configured with a central processing unit (CPU), read-only memory (ROM), flash memory, random access memory, input / output interface, analog-to-digital (A / D) converter, D / A converter, etc., and controls the inlet-side heat insulating shutter 32, outlet-side heat insulating shutter 33, liquefaction unit 4, take-out-side heat insulating shutter 61, feed conveyor 71, pyrolysis conveyor 72, and slow-cooling conveyor 73.

[0019] The processing method of the waste tire processing device of Figures 1, 2 and 3 will be described with reference to Figure 4. All or part of the flowchart in Figure 4 is stored as a program in the ROM or flash memory of the control unit 8 and executed by the control unit 8. Also, in the initial state, the entrance side insulating shutter 32, the exit side insulating shutter 33 and the removal side insulating shutter 61 are all assumed to be lowered and closed.

[0020] First, referring to the scrap tire bucket storage step 401, six scrap tires T with their wheels removed are stored vertically in two buckets B. In this case, the scrap tires T do not need to be cut, have their bead wires removed, or crushed.

[0021] Next, referring to the infeed conveyor placement step 402, a bucket B containing the waste tires T is placed on the infeed conveyor 71 using a robot or the like. For example, two buckets B are placed.

[0022] Next, referring to the pyrolysis conveyor placement step 403, after the entrance-side heat insulating shutter 32 is raised, the bucket B containing the waste tires T is moved from the feed conveyor 71 and placed on the pyrolysis conveyor 2. Thereafter, the entrance-side heat insulating shutter 32 is lowered.

[0023] Next, referring to the pyrolysis / carbonized gas liquefaction and recovery process 404, pyrolysis and carbonized gas liquefaction and recovery are carried out, which will be described with reference to FIG.

[0024] Next, referring to the slow-cooling conveyor placement process 405, the outlet-side heat insulating shutter 33 is raised and opened, and then the bucket B containing the pyrolyzed waste tires T is moved from the pyrolysis conveyor 72 and placed on the slow-cooling conveyor 73. Thereafter, the outlet-side heat insulating shutter 33 is lowered and closed to enter a slow-cooling state. This slow-cooling state is maintained for approximately 30 minutes.

[0025] Finally, referring to the wire / residue recovery process 407, the unloading-side insulating shutter 61 is raised and opened. The bucket B containing the wire W and residue R of the sufficiently cooled treated waste tire T is unloaded. Metal is recycled from the wire W, and carbide is recycled from the residue R.

[0026] Next, the thermal decomposition / pyrolysis gas liquefaction recovery step 404 of Fig. 4 will be described with reference to the flowchart of Fig. 5. All or part of the flowchart of Fig. 5 is stored as a program in the ROM or flash memory of the control unit 8 and executed by the control unit 8.

[0027] First, initial settings are made in step 501. For example, an appropriate temperature and processing time for the waste tires T are set.

[0028] Next, in step 502, the saturated steam generating unit 2 is started up.

[0029] Next, in step 503, the superheated steam generating unit 1 is started up.

[0030] Next, in step 504, the temperature T of the temperature sensor (one or both of temperature sensors 16 and 16′ described later) of the superheated steam generating unit 1 is A / D converted and taken in, and T≧T ０For example, it is determined whether the temperature is several hundred degrees Celsius. ０ Only if this is the case, proceed to step 505.

[0031] Next, in step 505, a solenoid valve (not shown) between the saturated steam generating unit 2 and the superheated steam generating unit 1 is turned on, and saturated steam is supplied from the saturated steam generating unit 2 to the saturated steam inlet 1a of the superheated steam generating unit 1. As a result, after about 3 to 5 minutes, the superheated steam Q of the superheated steam generating unit 1 reaches an appropriate temperature, for example, T ０ The temperature becomes several hundred degrees Celsius, which is larger than the above. After measuring this approximately 3 to 5 minutes in step 506, a timer for the initially set processing time is started in step 507. At the same time, the cyclone, hot water heat exchanger, and liquefaction heat exchanger of liquefaction unit 4 are also started.

[0032] Next, in step 508, it is determined whether the processing time set by the timer has elapsed, and after the processing time has elapsed, the pyrolysis / pyrolysis gas liquefaction recovery process is terminated in step 509. In other words, the saturated steam generation unit 2, the superheated steam generation unit 1, the cyclone of the liquefaction unit 4, the hot water heat exchanger, the liquefaction heat exchanger, etc. are stopped.

[0033] During the processing time in step 508 in FIG. 5, the pyrolyzed product, dry distillation gas G, is solidified and liquefied.

[0034] Figure 6 shows a first example of the superheated steam generation unit of Figures 1, 2, and 3, where (A) is a top view, (B) is a cross-sectional view taken along line B-B of (A), and (C) is a cross-sectional view taken along line CC of (A). The superheated steam generation unit 1 of Figure 1 is a single-stage type for high-temperature superheated steam of, for example, 700 to 800°C.

[0035] In Figure 6, the single-stage superheated steam generation unit 1 has an airtight rectangular parallelepiped insulation structure 11 consisting of an upper and surrounding area made of insulation material 111, a portion of the periphery made of joint material (which also serves as insulation) 112, a stainless steel frame 113 covering the insulation material 111 and the joint material 112, a handle 114 at the top of the stainless steel frame 113, and a mounting plate 115 at the bottom of the stainless steel frame 113. The insulation material 111 is, for example, felt or a plate-shaped molding material made of bulk fiber with inorganic and organic binders added. The joint material 112 is a hard insulating material, for example, concrete. The lower part of the rectangular parallelepiped insulation structure 11 is open at an open end OP1, into which a heating plate 14 (described below) is fitted. A saturated steam (or water) inlet 11a and a closed end 11b are inserted and fixed into the joint material 112.

[0036] In the superheated steam generating unit 1, a hairpin-shaped conductive hollow tube heater 12 made of an alloy such as Inconel, Hastelloy, or stainless steel is installed within a rectangular parallelepiped thermal insulation structure 11, extending from a saturated steam (or water) inlet 11a toward a closed end 11b. In this case, the hairpin-shaped conductive hollow tube heater 12 also has, for example, six straight sections 12-1 to 12-6 and five folded sections 12-7 to 12-11 that fold back the straight sections 12-1 to 12-6. A saturated steam-side electrode 13a equipped with a heat sink 13a-1 is installed on the saturated steam inlet 11a side of the hairpin-shaped conductive hollow tube heater 12, while a superheated steam-side electrode 13b equipped with a heat sink 13b-1 is installed on the closed end 11b side of the hairpin-shaped conductive hollow tube heater 12. When a DC or AC voltage is applied between the saturated steam side electrode 13a and the superheated steam side electrode 13b, the hairpin-shaped conductive hollow-tube heater 12 is heated to, for example, approximately 700°C to 800°C, and the saturated steam P in the hairpin-shaped conductive hollow-tube heater 12 becomes superheated steam Q1, which flows toward the closed end 11b. At this time, the superheated steam Q1 from the superheated steam discharge nozzle 12a in the hairpin-shaped conductive hollow-tube heater 12 is discharged downward from the opening in the heating plate 14. At the same time, the heating plate 14 is heated by radiant heat (far-infrared light) H1 from the hairpin-shaped conductive hollow-tube heater 12, and the far-infrared light H1 is discharged downward from the heating plate 14. In this case, the heating plate 14 is an iron plate, for example, stainless steel (SUS304), with the surface sintered with black ceramic, and a ceramic reflector 15 supported by a reflector stay 15a is provided above the heating plate 14 to increase the far-infrared light H1 from the heating plate 14. In this way, high-temperature heat treatment is possible using the combined heat of the superheated steam Q1 at, for example, 700°C to 800°C and the far-infrared light H1.

[0037] A temperature sensor (thermocouple) 16 is provided in the hairpin-shaped conductive hollow tube heater 12 to control the temperature of the hairpin-shaped conductive hollow tube heater 12 .

[0038] Next, the insulator structure of the hairpin-shaped conductive hollow tube heater 12 will be described with reference to Figure 7. The heater 12 includes a heat-resistant ceramic vertical holder 17 that slidably holds, for example, six straight sections 12-1 to 12-6 of the hairpin-shaped conductive hollow tube heater 12, stainless steel horizontal holders 18a and 18b that hold the ceramic vertical holder 17 from above and below, a stainless steel stay 19a that secures the horizontal holders 18a and 18b, and a stainless steel stay 19b that secures the horizontal holder 18b to the ceiling side of the stainless steel frame 113 via an upper insulating member 111. For ease of assembly, the ceramic vertical holder 17 is divided into eight holder pieces 17-1, 17-2, ..., 17-8. That is, the insulator structure is composed of ceramic vertical holders 17 (17-1, 17-2, ..., 17-8), horizontal holders 18a, 18b, and stays 19a, 19b. In this case, the ceramic vertical holder 17 has an opening with a diameter of, for example, 30 mm, which is larger than the diameter of the straight sections 12-1 to 12-6, for example, 20 mm. Therefore, even if the straight sections 12-1 to 12-6 of the hairpin-shaped conductive hollow-tube heater 12 thermally expand and contract, the straight sections 12-1 to 12-6 of the hairpin-shaped conductive hollow-tube heater 12 easily slide within the opening of the ceramic vertical holder 17, making them less likely to break. Note that the folded sections 12-7 to 12-11 of the hairpin-shaped conductive hollow-tube heater 12 also thermally expand and contract, but the amount of thermal expansion is smaller than that of the straight sections 12-1 to 12-6. However, if the folded portions 12-7 to 12-11 of the hairpin-shaped conductive hollow-tube heater 12 were firmly fixed, the thermal expansion and contraction of the straight portions 12-1 to 12-6 of the hairpin-shaped conductive hollow-tube heater 12 would be prevented, making the hairpin-shaped conductive hollow-tube heater 12 more susceptible to damage. Therefore, the folded portions 12-7 to 12-11 of the hairpin-shaped conductive hollow-tube heater 12 are left unconstrained.

[0039] 6, the heating plate 14 is provided, but the heating plate 14 may not be provided. In this case, the effect of the far-infrared light H1 is lost, and only the effect of the superheated steam Q1 remains.

[0040] Figure 8 shows a second example of the superheated steam generating unit of Figures 1, 2, and 3, where (A) is a cross-sectional view and (B) is a view taken along line B-B in (A). The superheated steam generating unit of Figure 8 is a two-stage type for generating superheated steam at ultra-high temperatures of, for example, 1000°C to 1600°C.

[0041] In Figure 8, a two-stage superheated steam generating unit 1' is constructed by adding a superheated steam generating function to the superheated steam generating unit 1 of Figure 6. That is, an airtight rectangular parallelepiped heat insulating structure 11' is added, which is composed of a heat insulating material 111', a stainless steel frame 112' covering the heat insulating material 111', and a mounting plate 113' at the bottom of the heat insulating material 111'. Instead of the heating plate 14 provided at the open end OP1 of Figure 6, a heating plate 14' for passing superheated steam Q1 is provided at the upper open end OP2 of the rectangular parallelepiped heat insulating structure 11', and a heating plate 14" is provided at the lower open end OP3 of the rectangular parallelepiped heat insulating structure 11'. In this case, the superheated steam discharge nozzle 12a passes through the opening of the heating plate 14' and enters the rectangular parallelepiped heat insulating structure 11'. In addition, a heating plate 14" made of, for example, molybdenum disilicide (MoSi ２6. In this case, when a DC or AC voltage is applied between the electrodes 13'a and 13'b, the high-temperature heater 12' is heated and the superheated steam Q1 in the rectangular parallelepiped heat insulating structure 11' becomes superheated steam Q2 having a higher temperature, for example, 1000°C to 1600°C, and the superheated steam Q2 flows toward the heating plate 14". As a result, the superheated steam Q2 is sent downward from the openings in the heating plate 14". At the same time, the heating plate 14' is heated by radiant heat (far-infrared light) H1 from the hairpin-shaped conductive hollow tube heater 12, and the far-infrared light H1 from the heating plate 14' is emitted downward from the heating plate 14" as far-infrared light H2. In this case, the heating plates 14', 14" are made of high-temperature resistant materials such as tungsten (W), molybdenum (Mo), or ceramics with their surfaces sintered into blackbody ceramics. In this way, ultra-high temperature heat treatment is possible by the combined heat of the superheated steam Q2 at, for example, 1000°C to 1600°C and the far-infrared light H2.

[0042] A temperature sensor (thermocouple) 16' is provided in the high-temperature heater 12' to control the temperature of the high-temperature heater 12'.

[0043] Although the heating plate 14'' is provided in FIG. 8, the heating plate 14'' may not be provided. In this case, the effect of the far-infrared light H2 is lost, and only the effect of the superheated steam Q2 remains.

[0044] The present invention can be applied to any modifications within the scope of the above-described embodiment.

[0045] 1: Superheated steam generating unit 11a: Saturated steam inlet 11b: Closed end 11: Rectangular heat insulating structure 111: Heat insulating material 112: Joint material 113: Stainless steel frame 114: Handle 115: Mounting plate 11a: Saturated steam inlet 11b: Closed end 12: Hairpin-shaped conductive hollow tube heater 12-1 to 12-6: Straight section 12-7 to 12-11: Folded section 12a: Superheated steam discharge nozzle 13a: Saturated steam side electrode 13a-1: Heat sink 13b: Closed end side electrode 13b-1: Heat sink 14, 14': Heating plate 15: Reflector 15a: Reflector stay 16: Temperature sensor 17: Vertical holder 17-1, 17-2, ..., 17-8: Holder pieces 18a, 18b: Horizontal holder 19a, 19b: Stay 2: Saturated steam generation unit 3: Pyrolysis chamber 3a: Dry distillation gas outlet 3b: Filter 31: Heat insulating material 32: Inlet side heat insulating shutter 33: Outlet side heat insulating shutter 4: Liquefaction unit 5: Crude oil tank 6: Slow cooling chamber 61: Take-out side heat insulating shutter 71: Infeed conveyor 72: Pyrolysis conveyor 73: Slow cooling conveyor 8: Control unit T: Waste tire B: Bucket W: Wire R: Residue P: Saturated steam (or water) Q1: Superheated steam H1: Far infrared light G: Dry distillation gas 1': Superheated steam generation unit 11': Rectangular heat insulating structure 111': Heat insulating material 112': Stainless steel frame 113': Mounting plate 12': High temperature heater 13a', 13b': Electrodes 13a-1: Heat sink 14": Heating plate 16': Temperature sensor Q2: Superheated steam H2: Far infrared light

Claims

1. A waste tire processing device comprising: a superheated steam generating unit (1, 1'); a pyrolysis chamber (3) provided below the superheated steam generating unit (1, 1') for pyrolyzing waste tires (T) with superheated steam (Q) from the superheated steam generating unit; and a liquefaction unit (4) for liquefying dry distillation gas (G) from the pyrolysis chamber (3) to extract oil components, etc.

2. The waste tire processing device according to claim 1, further comprising: a pyrolysis conveyor (72) for holding the waste tires (T) in the pyrolysis chamber (3); an entrance-side insulating shutter (32) for introducing the waste tires (T) into the entrance side of the pyrolysis chamber (3); an inlet conveyor (71) outside the entrance-side insulating shutter (32) for feeding the waste tires (T) into the pyrolysis chamber (3); an outlet-side insulating shutter (33) for discharging the waste tires (T) to the outlet side of the pyrolysis chamber (3); an annealing chamber (6) provided on the exit-side insulating shutter side for annealing the waste tires (T); an annealing conveyor (73) for holding the waste tires (T) in the annealing chamber (6); and an outlet-side insulating shutter (61) provided in the annealing chamber (6) for annealing wire / residue of the waste tires (T).

3. The superheated steam generating unit (1) comprises: a first heat insulating structure (11) having a saturated steam inlet (11a) or a water inlet and a closed end (11b) and having a first open end (OP1); a hairpin-shaped conductive hollow tube heater (12) provided in the first heat insulating structure (11) between the saturated steam inlet (11a) or the water inlet and the closed end (11b) and comprising a plurality of straight portions (12-1 to 12-6) and a plurality of folded portions (12-7 to 12-11) folding back the straight portions (12-1 to 12-6); and a superheated steam discharge nozzle (12a) provided midway in the hairpin-shaped conductive hollow tube heater (12) for discharging superheated steam (Q1) in the hairpin-shaped conductive hollow tube heater (12) toward the first open end (OP1). and an insulator structure (17, 18a, 18b, 19a, 19b) provided between the first heat insulating structure (11) and the straight portions (12-1 to 12-6) of the hairpin-shaped conductive hollow tube heater (12), for slidably holding the straight portions (12-1 to 12-6).

4. A waste tire processing device as described in claim 3, wherein the insulator structure (17, 18a, 18b, 19a, 19b) has an opening with a diameter larger than the diameter of the straight portions (12-1 to 12-6) and is provided with a heat-resistant holder (17) for passing the straight portions (12-1 to 12-6).

5. A waste tire processing device as described in claim 3, further comprising a first heating plate (14) provided at the first open end (OP1) and having an opening for passing the superheated steam discharge nozzle (12a).

6. A waste tire processing device according to claim 3, wherein the folded portions (12-7 to 12-11) are in an unconstrained state.

7. The waste tire processing device according to claim 3, further comprising: a second heat insulating structure (11') having a second open end (OP2) connected to the first open end (OP1) of the first heat insulating structure (11) and a third open end (OP3) opposite the second open end (OP2); and a high-temperature heater (12') provided within the second heat insulating structure (11') and having a higher temperature than the hairpin-shaped conductive hollow tube heater (12).

8. A waste tire processing device as described in claim 7, further comprising a second heating plate (14') provided at the second open end (OP2) of the second heat insulating structure (11') and having an opening for passing the superheated steam discharge nozzle (12a).

9. The waste tire processing device according to claim 8, wherein the high-temperature heater (12') is provided on the second heating plate (14').

10. The waste tire processing device according to claim 8, further comprising a third heating plate (14") provided at the third open end (OP3) of the second heat insulating structure (11') and having an opening for passing the superheated steam (Q2).

11. A waste tire storing process for storing waste tires (T) in a bucket (B); an infeed conveyor setting process for setting the bucket (B) on an infeed conveyor (71) after the waste tire storing process; a first bucket moving process for moving the bucket (B) from the infeed conveyor (71) onto a pyrolysis conveyor (72) of a pyrolysis chamber (3); a pyrolysis / pyrolysis gas liquefaction and recovery process for pyrolyzing the waste tires (T) with superheated steam (Q) in the pyrolysis chamber (3) and liquefying and recovering the pyrolysis gas (G) produced by the pyrolysis after the first bucket moving process; a second bucket moving process for moving the bucket (B) onto a slow-cooling conveyor (73) of a slow-cooling chamber (6) after the pyrolysis / pyrolysis gas liquefaction and recovery process; and a slow-cooling process for slowly cooling the waste tires (T) after the second bucket moving process. a wire / residue recovery step of recovering wire / residue (R) of the waste tire (T) after the slow cooling step.

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