JP2000167834A - Waste plastic heat decomposition device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the overheating of waste plastics generated by a heating medium and effectively utilize the energy of the heating medium to efficiently heat the waste plastics. SOLUTION: A waste plastic heat decomposition device is provided with an inner container 11 storing waste plastics and an outer container 12 encircling the inner container 11 and having a flow inlet 15 and a flow outlet 16 for a heating medium. The heating medium from a heating medium feeder 30 is introduced from the flow inlet 15 into the outer container 12 through an adjustment mechanism 31. The heating medium introduced into the outer container 12 flows from a parting wall 13 into a flow path A inside to efficiently heat the inner container 11. Then the heating medium is discharged from a flow path B through the flow outlet 16. During the above process, the adjustment mechanism 31 is controlled by a control device 32 based on signals from a thermometer 34 set on the inner container 11 to prevent the overheating of the inner container 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste plastic pyrolysis apparatus for heating waste plastics, for example, waste plastics containing vinyl chloride resin (hereinafter referred to as PVC), to convert the waste plastics into oil, and particularly to perform thermal decomposition efficiently. Waste pyrolysis apparatus.

[0002]

2. Description of the Related Art In recent years, as the use of plastics has increased, the amount of waste plastics has also become enormous, and this has contributed to environmental problems such as a shortage of landfill sites and generation of harmful gases due to depreciation. . Therefore, as a method of regenerating waste plastic, a method has been proposed in which oil is pyrolyzed or converted into a solid fuel. In particular, a technique for thermally decomposing waste plastic to recycle it as fuel oil has attracted attention because of its high value as a recycled product.

[0003] A pyrolysis apparatus for heating waste plastic to convert it into oil is provided with an inner container for storing the waste plastic, and an outer container surrounding the inner container.
The waste plastic in the inner container is heated and turned into oil.

[0004]

As described above, a thermal decomposition apparatus having an inner container and an outer container is known as a thermal decomposition apparatus. However, a heat medium flowing into the outer container has an unnecessarily large heat energy. In such a case, the waste plastic in the inner container may be burned.

On the other hand, the heat medium in the outer container may quickly flow out of the outer container, and the inner container may not be sufficiently heated.

[0006] The present invention has been made in view of such a point, it is possible to efficiently use the energy of the heat medium to efficiently heat the waste plastic in the inner container, and to burn the waste plastic. It is an object of the present invention to provide a waste plastic pyrolysis apparatus that can prevent the occurrence of waste.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a pyrolysis apparatus for heating waste plastics to liquefy the waste plastics. An outer container having a heat medium supply source connected to the inlet of the outer container, the flow rate and temperature of the heat medium supplied from the heat medium supply source are adjusted by an adjustment mechanism, and a thermometer is provided in the inner container. A waste plastic pyrolysis apparatus, wherein an adjustment mechanism is controlled by a control device based on a signal from the thermometer.

[0008] In a pyrolysis apparatus for heating waste oil to make it oily, an inner container for storing the waste plastic, an outer container surrounding the inner container and having an inlet and an outlet for a heat medium, A waste plastic pyrolysis apparatus comprising: a heat medium supply source connected to an inlet; and a spiral projection for guiding the heat medium on an outer surface of the inner container.

[0009] In a pyrolysis apparatus for heating waste oil to make it oily, an inner container for storing the waste plastic, an outer container surrounding the inner container and having an inlet and an outlet for a heating medium, A waste plastic pyrolysis apparatus comprising: a heat medium supply source connected to an inlet; and a partition wall for partitioning the inside of the outer container into an inner container side and an outer container side in the outer container.

[0010] In a pyrolysis apparatus for heating waste oil to make it oily, an inner container for storing the waste plastic, an outer container surrounding the inner container and having an inlet and an outlet for a heat medium, A waste plastic pyrolysis apparatus comprising: a heat medium supply source connected to an inlet; and a heat medium stirring device provided in an outer container.

[0011] In a pyrolysis apparatus for heating waste oil to make it oily, an inner container for storing the waste plastic, an outer container surrounding the inner container and having an inlet and an outlet for a heat medium, A heat medium supply source connected to the inlet, wherein the inflow port of the outer container is arranged so that the heat medium abuts at right angles to the inner container;

In a pyrolysis apparatus for heating waste plastic to convert it into oil, an inner container for storing the waste plastic, an outer container surrounding the inner container and having an inlet and an outlet for a heat medium, A waste plastic pyrolysis apparatus comprising: a heat medium supply source connected to an inlet; and a heat transfer promoter filled in an outer container.

[0013] In a pyrolysis apparatus for heating waste oil to convert it into oil, an inner container for storing the waste plastic, an outer container surrounding the inner container and having an inlet and an outlet for a heat medium, A waste plastic pyrolysis apparatus comprising: a heat medium supply source connected to an inlet; and a rod-shaped heater wound around an outer surface of the inner container.

In a pyrolysis apparatus for heating waste oil to make it oily, an inner container for storing the waste plastic, an outer container surrounding the inner container and having an inlet and an outlet for a heating medium, A waste plastic pyrolysis apparatus, comprising a heat medium supply source connected to the inlet, and a heat medium circulation duct provided between the outlet and the inlet of the outer container, and heating the waste plastic. An inner container for storing waste plastic,
A cooling device that surrounds the inner container and has an outer container having an inlet and an outlet for a heat medium, and a heat medium supply source connected to the inlet of the outer container, and a cooling device that cools the inside of the inner container at an upper portion of the outer container. This is a waste plastic pyrolysis apparatus characterized by the provision of:

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a first embodiment of a waste plastic pyrolysis apparatus according to the present invention.

As shown in FIG. 1, a waste plastic pyrolysis apparatus 10 includes an inner container 11 for storing waste plastic, an inlet 15 and an outlet 1 for the heat medium, which surround the inner container 11.
And an outer container 12 having the same.

The inner container 11 has a flange 20 at the upper end.
The flange 20 has a waste plastic inlet 2
The cover 21 having the cover 5 is fixed. Also this lid 2
1 is provided with an oil vapor discharge port 29.

Waste plastic containing PVC and the like is subjected to dehydrochlorination through a crushing device and a screw feeder (not shown) in advance, and the waste plastic subjected to dehydrochlorination is supplied from the inlet 25 of the waste plastic pyrolysis unit 10 to the inner container 11. It is to be thrown in. When the waste plastic is heated and turned into oil in the inner container 11, oil vapor is generated.
And sent to an oil recovery tower (not shown). on the other hand,
The waste plastic heated and liquefied in the inner container 11 becomes a residue and is discharged from the plastic discharge port 28.

Further, as described above, the outer container 12 has the inlet 15 and the outlet 16 for the heat medium.
Is supplied with a heat medium from the heat medium supply source 30. In this case, the flow rate and the temperature of the heat medium from the heat medium supply source 30 are adjusted through the adjustment mechanism 31. The adjustment mechanism 31 is controlled by a control device 32 based on a signal from a thermometer 34 provided in the inner container 11.

In the outer container 12, there is provided a partition wall 13 for partitioning the outer container 12 into a flow path A on the inner container 11 side and a flow path B on the outer container 12 side. Further, on the outer surface of the inner container 11, a spiral protrusion 14 for guiding the heat medium is provided. The spiral projection 14 is formed of a rod-shaped heater, and the inner container 11 can be effectively heated by the heater.

A flange 20 is provided above the outer container 12.
A cooling device 22 that cools the lid and the lid 21 is provided. The cooling device 22 prevents the flange 20 and the lid 21 from being thermally deformed, and improves the sealing performance between the flange 20 and the lid 21. A cooling water inlet 23 and a cooling water outlet 24 are connected to the cooling device 22.

Next, the operation of the present embodiment having the above configuration will be described.

In FIG. 1, waste plastic crushed by a crushing device, heated by a screw feeder and dehydrochlorinated is charged into the inner container 11 through the charging port 25. Thereafter, the waste plastic in the inner container 11 is mixed by a mixer tank (not shown) in the inner container 11.

During this time, the adjusting mechanism 3 is supplied from the heat medium supply source 30.
1 flows into the outer container 12 through the inflow port 15, and the inner container 1 is heated by the heat medium flowing into the outer container 12.
The waste plastic stored in 1 is heated and turned into oil.

[0025] Oil vaporized from waste plastic is
Thereafter, the oil is discharged from the oil vapor outlet 29 and sent to the oil recovery tower. On the other hand, waste plastics that have been heated and turned into oil
The residue is discharged from the plastic discharge port 28.

Next, the flow of the heat medium will be described in detail. Exhaust gas discharged from an oil recovery tower via a deodorizing device can be used as the heat medium. In this case, the heat medium supply source 30 may be a deodorizing device. The heat medium from the heat medium supply source 30 is supplied from the inflow port 15 through the adjustment mechanism 31 to the outer container 1.
2 flows into. The inflow port 15 is disposed so as to be substantially perpendicular to the outer surface of the inner container 11, and the inflow port 15 is further connected to an introduction duct 36 extending to the partition wall 13. Therefore, the heat medium flowing from the inflow port 15 abuts on the inner container 11 through the introduction duct 36 at substantially right angles, whereby the inner container 11 can be effectively heated.

The heat medium that has contacted the inner container 11 is then sent through a flow path A formed inside the partition wall 13 to further heat the inner container 11 and then sent to a flow path B outside the partition wall 13. Then, it is discharged outward from the outlet 16.

During this time, the flow rate and temperature of the heat medium are adjusted by the adjusting mechanism 31 based on the signal from the thermometer 34 provided in the inner container 11. For this reason, the temperature of the inner container 11 is adjusted to an appropriate temperature, and the inner container 1 is adjusted.
1 can be prevented from burning.

Further, the flow path A is formed through the inlet 15 of the outer container 12.
The heat medium that has entered inside flows along the spiral projection 14 and spirally flows upward in the flow path A. Therefore, the heat medium in the flow path A does not cause a short path, and the inner container 11 can be efficiently heated. Further, since the spiral projection 14 is formed of a rod-shaped heater, the inner container 11 can be heated by the projection 14 if necessary. Further, cooling water flows into a cooling device 22 provided at the upper part of the outer container 12 from a cooling water inlet 23 and flows out from a cooling water outlet 24. Therefore, the cooling device 22 can reliably prevent the flange 20 and the lid 21 from being thermally deformed, and can improve the sealing performance between the flange 20 and the lid 21. Further, by cooling the upper part of the outer container 12 by the cooling device 22, it is possible to cause oil vapor to be recirculated in the inner container 11, and to quickly discharge the oil vapor outward from the oil vapor outlet 29. Can be.

As described above, according to the present embodiment, it is possible to prevent the inner container 11 from being overheated, and thereby to prevent seizure of the waste plastic.
Further, the inner container 11 can be efficiently heated by effectively utilizing the energy of the heat medium.

In the above embodiment, the outer container 12
The example in which the partition wall 13 is provided in the inside is shown.
Need not necessarily be provided.

When the partition wall 13 is not provided, a heating medium stirring device 19 can be provided in the outer container 12 to prevent a short path of the heating medium. Alternatively, the outer container 12 may be filled with a heat transfer promoter 27 formed of a ceramic hole or the like, and heat transfer promoting fins may be provided on the outer surface of the inner container 11 to increase the heat transfer efficiency of the heat medium to the inner container 11. Second Embodiment Next, a second embodiment of the waste plastic pyrolysis apparatus according to the present invention will be described with reference to FIG.

A second embodiment shown in FIG.
A short-path control valve 35 for short-passing a part of the heat medium into the flow path B of the outer container 12 is provided in the introduction duct 36 from the second inlet 15, and a circulation control valve 18 is provided in the outlet 16, A part of the heat medium discharged from the outlet 16 is circulated through the circulation duct 17 from the additional inlet 15a into the outer container 12.

In FIG. 2, the same parts as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 2, the heat medium flowing from the heat medium supply source 30 through the adjusting mechanism 31 into the outer container 12 from the inflow port 15 is introduced into the flow path A from the introduction duct 36.
In this case, the control device 3 is controlled based on a signal from the thermometer 34.
The short path control valve 35 is operated by 2 to cause a part of the heat medium in the introduction duct 36 to be short-passed to the flow path B via the short path control valve 35. In this way, overheating of the inner container 11 can be prevented.

A part of the heat medium discharged from the outlet 16 is sent to the circulation duct 17 through the circulation control valve 18, and the heat medium in the circulation duct 17 is returned from the additional inlet 15a into the flow path A. be able to.

In this case, by controlling the circulation control valve 18 by the control device 32 based on a signal from the thermometer 34, the inner container 11 can be more appropriately heated by the heat medium. Furthermore, if necessary, cool air is supplied from the cool air supply device 33 to the circulation duct 17 and the additional inflow port 1 is supplied.
5, the temperature of the heat medium returned into the flow path A can be adjusted. This cool air supply device 33 can also be controlled by the control device 32 based on a signal from the thermometer 34.

In this embodiment, an example has been shown in which the heat medium in the circulation duct 17 is guided to the additional inlet 15a, but the heat medium in the circulation duct 17 is connected by connecting the circulation duct 17 and the inlet 15. May be introduced from the inflow port 15 into the outer container 12.

[0039]

As described above, according to the present invention, overheating of the inner container can be prevented beforehand, thereby preventing seizure of the waste plastic. Further, the inner container can be efficiently heated by effectively utilizing the energy of the heat medium.

[Brief description of the drawings]

FIG. 1 is a first view of a waste plastic pyrolysis apparatus according to the present invention.
FIG.

FIG. 2 shows a second embodiment of the waste plastic pyrolysis apparatus according to the present invention.
FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Pyrolyzer 11 Inner container 12 Outer container 13 Partition wall 14 Spiral protrusion 15 Inlet 16 Outlet 17 Circulation duct 18 Circulation control valve 19 Stirrer 22 Cooling device 30 Heat medium supply source 31 Adjustment mechanism 32 Control device 33 Cold air Supply device 34 Thermometer 35 Short path control valve 36 Inlet duct

Claims (9)

[Claims] 1. A pyrolysis apparatus for heating waste plastics to liquefy it, comprising: an inner container for storing the waste plastic; an outer container surrounding the inner container and having an inlet and an outlet for a heating medium; A heat medium supply source connected to the inlet of the heat medium, the flow rate and temperature of the heat medium supplied from the heat medium supply source are adjusted by an adjustment mechanism, a thermometer is provided in the inner container, and a signal from the thermometer is provided. A waste plastic pyrolysis apparatus characterized in that an adjustment mechanism is controlled by a control device based on the following. 2. A pyrolysis apparatus for heating waste oil to make it oily, comprising: an inner container for storing the waste plastic; an outer container surrounding the inner container and having an inlet and an outlet for a heating medium; And a heating medium supply source connected to an inlet of the waste plastic, and a spiral projection for guiding the heating medium is provided on an outer surface of the inner container. 3. A pyrolysis apparatus for heating waste plastic to liquefy it, comprising: an inner container for storing the waste plastic; an outer container surrounding the inner container and having an inlet and an outlet for a heating medium; Waste heat pyrolysis apparatus, comprising: a heat medium supply source connected to an inlet of the container; and a partition wall for partitioning the outer container into an inner container side and an outer container side in the outer container. . 4. A pyrolysis apparatus for heating waste oil to make it oily, comprising: an inner container for storing the waste plastic; an outer container surrounding the inner container and having an inlet and an outlet for a heating medium; And a heating medium supply source connected to an inlet of the waste plastic, and a stirrer for the heating medium is provided in the outer container. 5. A pyrolysis apparatus for heating waste plastic to liquefy it, comprising: an inner container for storing the waste plastic; an outer container surrounding the inner container and having an inlet and an outlet for a heating medium; And a heating medium supply source connected to the inflow port of the waste plastic pyrolysis apparatus, wherein the inflow port of the outer container is disposed so that the heating medium is in contact with the inner container substantially orthogonally. 6. A pyrolysis apparatus for heating waste oil to convert it into oil, comprising: an inner container for storing the waste plastic; an outer container surrounding the inner container and having an inlet and an outlet for a heat medium; And a heat medium supply source connected to an inlet of the waste plastic, and a heat transfer promoter is filled in the outer container. 7. A pyrolysis apparatus for heating waste plastic to liquefy it, comprising: an inner container for storing the waste plastic; an outer container surrounding the inner container and having an inlet and an outlet for a heating medium; And a heat medium supply source connected to the inlet of the container, wherein a rod-shaped heater is wound around the outer surface of the inner container. 8. A thermal decomposition apparatus for heating waste plastics to liquefy it, comprising: an inner container for storing the waste plastic; an outer container surrounding the inner container and having an inlet and an outlet for a heating medium; And a heat medium supply source connected to the inflow port, and a heat medium circulation duct is provided between the outflow port and the inflow port of the outer container. 9. A pyrolysis apparatus for heating waste oil to make it oily, comprising: an inner container for storing the waste plastic; an outer container surrounding the inner container and having an inlet and an outlet for a heating medium; And a heat medium supply source connected to the inlet of the waste plastic, and a cooling device for cooling the inside of the inner container is provided above the outer container.