WO2012005055A1

WO2012005055A1 - Waste plastic pyrolizing apparatus

Info

Publication number: WO2012005055A1
Application number: PCT/JP2011/061165
Authority: WO
Inventors: 中塚　廣重
Original assignee: 株式会社オールマイティー
Priority date: 2010-07-09
Filing date: 2011-05-16
Publication date: 2012-01-12
Also published as: TW201209080A; JP2012017441A

Abstract

Disclosed is a waste plastic pyrolizing apparatus that can reduce processing time. Specifically disclosed is a pyrolizing device for pyrolizing waste plastic and comprising: a pyrolitic vessel that houses the waste plastic; a heating means disposed in the pyrolitic vessel and that heats the waste plastic inside the pyrolitic vessel; and a control means that controls the amount of heat applied by the heating means in order to adjust the temperature inside the pyrolitic vessel.

Description

Waste plastic thermal decomposition equipment

The present invention relates to a thermal decomposition treatment apparatus for waste plastic.

In recent years, efforts to form a recycling-oriented economic society have begun in various fields, and the need to recycle waste plastics is also increasing. As one of the recycling processes of waste plastics, a process called oil conversion for extracting oil from waste plastics is known. In this oil conversion treatment, waste plastic is put into a thermal decomposition tank provided in the thermal decomposition processing equipment, and the thermal decomposition tank is heated and decomposed to heat pyrolysis gas by heating the thermal decomposition tank from the outside. The oil is obtained by cooling the generated pyrolysis gas. Among waste plastics subjected to such oily treatment, those that are discharged mainly from medical institutions and classified as so-called infectious medical wastes need to be sterilized prior to thermal decomposition treatment. Waste plastic classified as infectious medical waste is sterilized by a sterilization apparatus, then transferred from the sterilization apparatus to a thermal decomposition tank, and thermally decomposed in a thermal decomposition layer (see, for example, Patent Document 1).

Japanese Patent No. 4153923

Since the capacity of the pyrolysis tank is not sufficient in the oiling treatment as described above, the waste plastic is put into the pyrolysis tank so that as much waste plastic sterilized by the sterilizer can be put into the pyrolysis tank as much as possible. It is necessary to crush with a crushing device before transferring and then reduce the volume. In addition, when crushing waste plastic, if the metal is mixed in the waste plastic, the crushing device may be clogged and the operation may stop or break down. Therefore, it is necessary to separate and remove the metal from the waste plastic in advance. was there. Thus, in the conventional pyrolysis processing apparatus, it is necessary to perform pretreatment such as metal separation, crushing, and volume reduction on the waste plastic to be processed, so that the processing time of the entire oil conversion processing is increased. There was a problem.

Therefore, an object of the present invention is to provide a thermal decomposition treatment apparatus that can shorten the treatment time.

A thermal decomposition treatment apparatus according to the present invention is made to solve the above-described problem, and is a thermal decomposition treatment apparatus for thermally decomposing waste plastic, which includes a thermal decomposition tank that accommodates waste plastic, Provided in the pyrolysis tank, heating means for heating the waste plastic in the pyrolysis tank, control means for controlling the heating amount of the heating means to adjust the temperature in the pyrolysis tank, It has.

In the thermal decomposition treatment apparatus according to the present invention, the heating means is provided in the thermal decomposition tank, so that the heating means is provided in the thermal decomposition tank more than the conventional thermal decomposition apparatus in which the heating means is provided outside the thermal decomposition tank. Since the rate of temperature rise is increased, the capacity of the pyrolysis tank can be expanded without extending the heating time as compared with the conventional pyrolysis apparatus. For this reason, a large amount of waste plastic can be put into the pyrolysis tank in its original form, and the sterilization process and pyrolysis process of the waste plastic can be continuously performed in the pyrolysis tank. As described above, the thermal decomposition treatment apparatus according to the present invention can eliminate the waste plastic pretreatment process such as metal separation, crushing, and volume reduction, and the waste plastic transfer process from the sterilization treatment apparatus to the thermal decomposition treatment apparatus. Therefore, the processing time can be shortened and the cost can be reduced.

Further, in the above thermal decomposition treatment apparatus, the heating means is preferably a superheated steam supply pipe that is heated by energization. This superheated steam supply pipe changes the saturated steam supplied to the inside by being heated to superheated steam, and discharges this superheated steam into the thermal decomposition tank. The inside of the thermal decomposition tank can be more efficiently heated by the heat of the superheated steam and the superheated steam supply pipe itself.

In addition, the thermal decomposition treatment apparatus can be used as a dry heat sterilization apparatus only by energizing the superheated steam supply pipe.

Moreover, the said thermal decomposition processing apparatus may be equipped with the cooler for cooling superheated steam in the outer side of the said thermal decomposition tank. This cooler can cool and condense excess superheated steam discharged from the pyrolysis tank and return it to the pyrolysis tank. According to this structure, it can prevent that the inside of a thermal decomposition tank becomes a high voltage | pressure by the superheated steam sent in a thermal decomposition tank.

The pyrolysis apparatus may include a stirrer whose rotating shaft extends parallel to the inner bottom surface of the pyrolysis tank. By stirring the waste plastic in the pyrolysis tank with this stirrer, the waste plastic after pyrolysis treatment and organic residue such as wood chips and paper waste can be made into powder and more efficient in the pyrolysis tank Can be heated well.

The agitator is configured to be able to transport waste plastic toward the waste plastic discharge port formed in the thermal decomposition tank. According to this configuration, the waste plastic after pyrolysis in the pyrolysis tank can be efficiently discharged out of the pyrolysis tank.

Further, in the above thermal decomposition treatment apparatus, the control means has heating means so that the temperature in the thermal decomposition tank becomes a first temperature for sterilizing the waste plastic and a second temperature for oiling the waste plastic. The amount of heating can be controlled.

The control means may further control the heating amount of the heating means so that the temperature in the pyrolysis tank becomes a third temperature for carbonizing organic matter such as waste plastic and wood chips / paper waste.

According to the present invention, the processing time can be shortened.

It is front sectional drawing of the thermal decomposition processing apparatus which concerns on this embodiment. It is a top view of the thermal decomposition processing apparatus which concerns on this embodiment. It is a left view of the thermal decomposition processing apparatus which concerns on this embodiment. FIG. 2 is a cross-sectional view taken along the line AA in FIG. It is a right view of the thermal decomposition processing apparatus which concerns on this embodiment. It is a front enlarged view of the cooler concerning this embodiment. 1 is an overall schematic diagram of a waste plastic oil processing system according to the present embodiment.

Hereinafter, an embodiment of a thermal decomposition processing apparatus according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the thermal decomposition treatment apparatus 1 according to the present embodiment cools and condenses the thermal decomposition tank 2, the superheated steam supply pipe 3 for introducing the superheated steam into the thermal decomposition tank 2, and the superheated steam. A cooler 4 (cooling means) is provided.

The pyrolysis tank 2 has a substantially rectangular parallelepiped shape and is hollow so that waste plastic can be accommodated therein. As shown in FIG. 2, on the upper surface of the thermal decomposition tank 2, there is provided a lid portion 21 that can be opened and closed for charging waste plastic, and a discharge pipe 23 for discharging thermal decomposition gas generated from the waste plastic. An electric damper 24 for adjusting the flow rate of the pyrolysis gas is attached to the discharge pipe 23. Further, a safety valve 25 and a cooling shower supply port 26 for supplying a shower of cooling water into the pyrolysis tank 2 are provided on the upper surface of the pyrolysis tank 2. As shown in FIGS. 2 and 3, the left side surface of the pyrolysis tank 2 has two door portions 27 (discharge ports) that can be opened and closed in order to take out so-called residues that are carbides generated after the pyrolysis treatment. Further, a nitrogen gas inlet 28 for injecting cooling nitrogen gas into the pyrolysis tank 2 is formed. A blower 6 for cooling the pyrolysis tank 2 is installed below the pyrolysis tank 2 as shown in FIG.

As shown in FIG. 4, the pyrolysis tank 2 is provided with two agitators 5 for agitating the waste plastic during the pyrolysis treatment. The stirrer 5 has a rotating shaft 51 extending in parallel to the bottom surface of the pyrolysis tank 2, and the rotating shaft 51 is provided with a plurality of blades 53 around it and can be rotated in both directions by a motor 52. ing. The stirrer 5 stirs the waste plastic in the pyrolysis tank 2 when the rotary shaft 51 rotates in one direction by the motor 52, and the waste plastic in the pyrolysis tank 2 when the rotary shaft 51 rotates in the reverse direction. It is configured to carry toward the side. Moreover, as shown in FIG.1 and FIG.4, in the pyrolysis tank 2, the pressure gauge 7 for measuring the pressure in the pyrolysis tank 2 and the heat in the pyrolysis tank 2 are made not to escape. A heat insulating material 8 is provided.

As shown in FIGS. 1 and 4, the superheated steam supply pipe 3 is provided in the pyrolysis tank 2, and is disposed so as to be folded up and down on the front and rear side wall surfaces in the pyrolysis tank 2. . The superheated steam supply pipe 3 is configured as a so-called heater pipe that is heated to a maximum of 900 ° C. by energization, and changes saturated steam sent from an electric once-through boiler 300 described later and passing through the inside into 200 to 750 ° C. superheated steam. The heating amount of the superheated steam supply pipe 3 is automatically controlled by an operation panel 9 (control means) with a built-in sequencer. As the material for the superheated steam supply pipe 3, one having corrosion resistance at high temperatures is preferable, and for example, a nickel chromium alloy can be used. The nickel-chromium alloy is not particularly limited, but preferably contains 58 to 63% nickel and 21 to 25% chromium, for example, Inconel (registered trademark) 601. When the capacity of the pyrolysis tank 2 is 4.16 m ³ , the size of the superheated steam supply pipe 3 is not particularly limited, but the outer diameter is 26.7 mm, the inner diameter is 21.3 mm, and the length is 15 to It is preferable that it is 18m, for example, is piping size 15A.

As shown in FIG. 5, four coolers 4 are attached to the right side surface of the pyrolysis tank 2. As shown in FIG. 6, the cooler 4 includes a cooling pipe 42 that is a double pipe, and the cooling pipe 42 has a water supply port for supplying cooling water between the inner pipe and the outer pipe. 421 and a water discharge port 422 for discharging the cooling water are provided. The cooling pipe 42 introduces the superheated steam in the pyrolysis tank 2 into the inner pipe via the first conduit 41a, and cools and condenses the superheated steam with cooling water flowing between the inner pipe and the outer pipe. Thereafter, the cooling pipe 42 returns the superheated steam that has been cooled and condensed into water into the pyrolysis tank 2 through the second conduit 41b. The first conduit 41a is provided with an electromagnetic valve 43 for stopping the discharge of superheated steam from the pyrolysis tank 2, and the second conduit 41b is used to prevent the backflow of superheated steam after condensation. The check valve 44 is provided.

The thermal decomposition apparatus 1 configured as described above is disposed in the uppermost stream of the waste plastic oil processing system 100 as shown in FIG. The pyrolysis apparatus 1 is connected to an electric once-through boiler 300 for generating saturated steam by introducing and heating the water stored in the water tank 200. A catalyst tower 500 for reforming the pyrolysis gas with a zeolite catalyst or the like is disposed downstream of the pyrolysis apparatus 1. Between the catalyst tower 500 and the pyrolysis apparatus 1, the pyrolysis is performed. A scrubber 400 is provided for neutralizing the gas with a calcium hydroxide solution to remove chlorine in the pyrolysis gas. In the scrubber 400, a hypo (sodium thiosulfate) solution is used as a reducing agent. A condensing device 600 for cooling and condensing the pyrolysis gas to produce oil is disposed downstream of the catalyst tower 500. The condensing device 600 includes two cooling tanks 601, and cooling water cooled by the cooling tower 602 flows on the outer surfaces of the two cooling tanks 601. Further, a centrifuge 700 for separating water from the generated oil is disposed downstream of the condenser 600. The oil from which water has been separated by the centrifuge 700 is stored in the oil tank 800 via the first FA filter 801, and the water separated from the oil is stored in the water tank 200 via the second FA filter 201. Stored. In addition, so-called off-gas that is not condensed in the condenser 600 is washed by the caustic soda solution in the off-gas washing tank 901, temporarily stored in the off-gas tank 902, and then purified by the PIP titanium natural catalyst in the off-gas purifier 903. Thereafter, the off-gas is sterilized by the titanium oxide photocatalytic ceramic filter, which is a photocatalyst, in the off-gas purification device 900 and exhausted into the atmosphere from the exhaust duct 904.

Next, the operation method of the thermal decomposition processing apparatus 1 configured as described above and the waste plastic oil processing system 100 in which the thermal decomposition processing apparatus 1 is installed will be described.

First, in a state where the electric damper 24 of the discharge pipe 23 and the electromagnetic valve 43 of the cooler 4 are closed, the lid portion 21 is opened and waste plastics that are infectious medical waste are put into the thermal decomposition tank 2. Then, the cover part 21 is closed and the inside of the thermal decomposition tank 2 is sealed (refer FIG. 2).

Next, the superheated steam supply pipe 3 is heated up to 900 ° C. by energization, and the inside of the thermal decomposition tank 2 is heated by the heat of the superheated steam supply pipe 3 itself. When the temperature in the pyrolysis tank 2 exceeds 180 ° C., the heating amount of the superheated steam supply pipe 3 is automatically controlled by the sequencer of the operation panel 9 so that the temperature in the pyrolysis tank 2 does not increase any more, The temperature in the pyrolysis tank 2 is maintained at 180 ° C. or higher (first temperature) for at least 30 minutes. Thereby, the waste plastic which is the infectious medical waste in the thermal decomposition tank 2 is dry heat sterilized.

Next, with the electromagnetic valve 43 of the cooler 4 closed, the electric damper 24 is opened and the discharge pipe 23 is opened. Then, the electric once-through boiler 300 is operated, and water is supplied into the electric once-through boiler 300 via the water softener. Water in the tank 200 is supplied. Thereby, saturated steam is generated in the electric once-through boiler 300, and this saturated steam is sent from the electric once-through boiler 300 to the superheated steam supply pipe 3. The superheated steam supply pipe 3 is heated up to 900 ° C. by energization, whereby the saturated steam sent from the electric once-through boiler 300 in the superheated steam supply pipe 3 is changed to superheated steam of 200 to 750 ° C. The superheated steam thus generated is discharged from the superheated steam supply pipe 3 into the thermal decomposition tank 2, and the inside of the thermal decomposition tank 2 is rapidly heated by the superheated steam and the superheated steam supply pipe 3. Since the electromagnetic valve 43 is closed and the electric damper 24 is opened, excess superheated steam in the thermal decomposition tank 2 is not discharged to the cooler 4 but is discharged to the discharge pipe 23. When the temperature in the pyrolysis tank 2 rises, the waste plastic in the pyrolysis tank 2 starts to melt. At this time, when the motor 52 of the stirrer 5 is driven and the rotating shaft 51 is rotated at a predetermined rotational speed, the stirrer 5 stirs the molten waste plastic in the pyrolysis tank 2 (see FIG. 4).

In this way, while the waste plastic in the pyrolysis tank 2 is stirred by the stirrer 5, the heating in the pyrolysis tank 2 is continued until the temperature in the pyrolysis tank 2 reaches 250 to 500 ° C. (second temperature). to continue. The heating amount of the superheated steam supply pipe 3 is automatically controlled by the sequencer of the operation panel 9 so that the temperature in the pyrolysis tank 2 does not exceed the second temperature. After the temperature in the pyrolysis tank 2 reaches the second temperature, the temperature in the pyrolysis tank 2 is maintained at the second temperature for a predetermined time (preferably 120 to 150 minutes), thereby Pyrolysis gas is generated from waste plastic.

The pyrolysis gas generated in this manner is discharged out of the pyrolysis tank 2 through the discharge pipe 23. As shown in FIG. 7, the pyrolysis gas is reformed into a low boiling point gas by removing chlorine from the scrubber 400 and touching the catalyst in the catalyst tower 500. The reformed pyrolysis gas is supplied to the condensing device 600, passes through the cooling tank 601 of the condensing device 600, and is cooled and condensed by the cooling water flowing on the outer surface of the cooling tank 601. Thereby, oil is produced | generated from pyrolysis gas. The oil produced in the condensing device 600 is sent to the centrifuge 700, and water is separated by the centrifuge 700. The oil from which water has been separated by the centrifuge 700 passes through the first FA filter 801 to remove formaldehyde, and is then stored in the oil tank 800. On the other hand, the water separated from the oil by the centrifuge 700 passes through the second FA filter 201 to remove formaldehyde, and then is returned to the water tank 200 to be reused for the generation of saturated steam.

Here, the pyrolysis gas contains components that are not condensed by the condenser 600. For this reason, the off gas that has not been condensed in the cooling tank 601 of the condenser 600 is sent out to the off gas cleaning tank 901. The off-gas is cleaned in the off-gas cleaning tank 901, temporarily stored in the off-gas tank 902, and then supplied to the off-gas purifier 903 for purification and organic decomposition. The purified and organically decomposed off-gas is then sterilized in the off-gas purification apparatus 900 and discharged from the exhaust duct 904 to the atmosphere.

After oiling in this way, the waste plastic after pyrolysis gas generation is carbonized in the pyrolysis tank 2. More specifically, the superheated steam at 500 to 750 ° C. is heated in the superheated steam supply pipe 3 by heating the superheated steam supply pipe 3 to 900 ° C. by energization with the electromagnetic valve 43 closed and the electric damper 24 open. Is generated. This superheated steam is introduced into the pyrolysis tank 2 from the superheated steam supply pipe 3, and the temperature in the pyrolysis tank 2 is increased to 450 to 650 ° C. (third temperature) by the superheated steam and superheated steam supply pipe 3. . The heating amount of the superheated steam supply pipe 3 is automatically controlled from 0 by the sequencer of the operation panel 9 so that the temperature in the pyrolysis tank 2 does not exceed the third temperature. After the temperature in the pyrolysis tank 2 reaches the third temperature, the temperature in the pyrolysis tank 2 is maintained at this third temperature for a predetermined time (preferably 10 to 20 minutes). A carbide called residue is produced. In the carbonization treatment, a slight amount of pyrolysis gas is generated, but this pyrolysis gas is also recovered in the same line as the oil conversion treatment described above.

After the carbonization treatment, the operation of the electric once-through boiler 300 is stopped, the energization of the superheated steam supply pipe 3 is stopped, the heating of the superheated steam supply pipe 3 is stopped, and the pyrolysis tank 2 is naturally cooled. In addition, a cooling shower can be supplied into the thermal decomposition tank 2 from the cooling shower supply port 26, and the inside of the thermal decomposition tank 2 can also be forcedly cooled. Further, in combination with the cooling shower, nitrogen gas may be injected into the pyrolysis tank 2 from the nitrogen gas inlet 28, or air may be blown toward the pyrolysis tank 2 by the blower 6.

After cooling the pyrolysis tank 2, the rotating shaft 51 of the stirrer 5 is rotated by the motor 52 at a predetermined rotational speed in the direction opposite to the rotational direction during the oiling process while the door portion 27 is closed. Thereby, since the residue in the pyrolysis tank 2 is conveyed to the door part 27 side and collected in the door part 27 vicinity, a residue can be easily collect | recovered from the door part 27. FIG.

As described above, the pyrolysis apparatus 1 according to the present embodiment can efficiently heat the inside of the pyrolysis tank 2 by supplying superheated steam into the pyrolysis tank 2. The capacity of can be increased. For this reason, it becomes possible to throw a large amount of waste plastics to be processed into the pyrolysis tank 2 as it is, and the sterilization process and the pyrolysis process can be continuously performed in the pyrolysis tank 2. As a result, the processing time of the entire oil processing can be shortened, and the oil processing can be performed efficiently. Further, in the thermal decomposition treatment apparatus 1 of the present embodiment, a stirrer 5 is provided in parallel with the bottom surface of the thermal decomposition tank 2 in the thermal decomposition tank 2. That is, since the end portion of the agitator 5 does not protrude from the upper surface of the pyrolysis tank 2, the door portion 2 for introducing waste plastic can be enlarged on the upper surface of the pyrolysis tank 2.

As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention. For example, in the above-described embodiment, the superheated steam supply pipe 3 is disposed on the front side wall surface and the rear side wall surface in the thermal decomposition tank 2, but is not limited to this as long as it is provided in the thermal decomposition tank 2. Depending on the shape or the like of the waste plastic put into the tank 2, it may be provided on the left and right wall surfaces, the ceiling surface, the bottom surface, or the center part in the pyrolysis tank 2.

Moreover, in the said embodiment, although the heating means was the superheated steam supply pipe 3, if it was provided in the thermal decomposition tank 2, it will not be limited to this, For example, an electric heater etc. may be sufficient and a superheat is carried out. The steam supply pipe 3 and an electric heater may be used in combination.

Moreover, in the said embodiment, although the sterilization process was performed only by heating the superheated steam supply pipe 3 by electricity supply, it introduce | transduces into the thermal decomposition tank 2 through the heating of the superheated steam supply pipe 3, and the superheated steam supply pipe 3. The inside of the thermal decomposition tank 2 may be heated by the superheated steam. Specifically, during the sterilization process, the electric damper 24 of the discharge pipe 23 and the electromagnetic valve 43 of the cooler 4 are closed to seal the pyrolysis tank 2 and the superheated steam supply pipe 3 is heated up to 900 ° C. by energization. And the electric once-through boiler 300 is operated. As a result, the saturated steam sent from the electric once-through boiler 300 to the superheated steam supply pipe 3 is changed to superheated steam at 200 to 750 ° C. in the superheated steam supply pipe 3, and the superheated steam is thermally decomposed from the superheated steam supply pipe 3. It is discharged into the tank 2. With the heat of the superheated steam and the superheated steam supply pipe 3 itself, the inside of the pyrolysis tank 2 is heated to 180 ° C. or more (first temperature), and the inside of the pyrolysis tank 2 is maintained at the first temperature for at least 30 minutes. To sterilize the waste plastic.

Thus, when the sterilization process is performed using both the heat of the superheated steam supply pipe 3 and the superheated steam, it is preferable to use the cooler 4. More specifically, when the electric damper 24 is closed and the electromagnetic valve 43 is opened during the sterilization process, excess superheated steam in the thermal decomposition tank 2 is passed through the first conduit 41a to the inner pipe of the cooling pipe 42. To be introduced. The superheated steam is cooled and condensed in the inner pipe of the cooling pipe 42 by the cooling water flowing between the inner pipe and the outer pipe, and then returned to the pyrolysis tank 2 through the second conduit 41b (FIG. 6). Thereby, it can prevent that the inside of the thermal decomposition tank 2 becomes a high voltage | pressure. The superheated steam condensed by the cooler 4 to become water can be sterilized by a photocatalyst such as titanium oxide outside the thermal decomposition tank 2 and reused. Moreover, the excess superheated steam discharged | emitted from the thermal decomposition tank 2 can also be incinerated without using the cooler 4. FIG. In this case, it is preferable to incinerate before the superheated steam touches the outside air.

Moreover, in the said embodiment, although the thermal decomposition processing apparatus 1 performed the sterilization process and the thermal decomposition process, it is not limited to this, It can also be used independently as a sterilization apparatus.

Moreover, in the said embodiment, although the pyrolysis tank 2 was substantially rectangular parallelepiped shape, it is not limited to this, It can be set as various shapes, such as column shape and polygonal column shape.

Moreover, in the said embodiment, although the stirrer 5 became a shape with the some blade | wing 53, if it can stir the waste plastic in the thermal decomposition tank 2, it will not be limited to this, Various things, such as screw shape, are included. It can be a shape.

Moreover, in the said embodiment, although the thermal decomposition processing apparatus 1 was arrange | positioned in the waste plastic oil-ized processing system 100 as shown in FIG. 7, it is not limited to this, Various well-known waste plastic oil-ized processing. Can be placed in the system.

1 Pyrolysis treatment device 2 Pyrolysis tank 27 Door (discharge port)
3 Superheated steam supply pipe 4 Cooler (cooling means)
5 Stirrer 9 Operation panel (control means)

Claims

A thermal decomposition treatment apparatus for thermally decomposing waste plastic,
A pyrolysis tank containing waste plastic;
A heating means provided in the pyrolysis tank and heating waste plastic in the pyrolysis tank;
Control means for controlling the heating amount of the heating means in order to adjust the temperature in the pyrolysis tank;
A thermal decomposition processing apparatus comprising:
The heating means is a superheated steam supply pipe that changes the saturated steam supplied to the inside by being heated by energization into superheated steam and releases the superheated steam into the pyrolysis tank. Item 2. The thermal decomposition treatment apparatus according to Item 1.
A cooler for cooling the superheated steam is further provided outside the pyrolysis tank;
The thermal decomposition processing apparatus according to claim 2, wherein the cooler cools and condenses superheated steam discharged from the thermal decomposition tank and returns it to the thermal decomposition tank.
The thermal decomposition treatment apparatus according to any one of claims 1 to 3, further comprising a stirrer for rotating the rotating shaft parallel to an inner bottom surface of the thermal decomposition tank and stirring the waste plastic in the thermal decomposition tank.
The pyrolysis tank is formed with a discharge port for discharging waste plastic,
The pyrolysis apparatus according to claim 4, wherein the agitator conveys waste plastic in the pyrolysis tank toward the discharge port.
The control means controls the heating amount of the heating means so that the temperature in the pyrolysis tank becomes a first temperature for sterilizing the waste plastic and a second temperature for oiling the waste plastic. The thermal decomposition treatment apparatus according to any one of claims 1 to 5.
The thermal decomposition processing apparatus according to claim 6, wherein the control means controls the heating amount of the heating means so that the temperature in the thermal decomposition tank becomes a third temperature for carbonizing the waste plastic.