JP2014029817A - Recycle system for coated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system capable of separating and recovering copper wires and coating materials obtained by carbonizing a coat of a coated wire in a short time.SOLUTION: A recycle system 1 for a coated wire comprises: a continuous carbonization apparatus 2 which separates and recovers coating materials and copper wires by pyrolysis of a coated wire 14 under an oxygen-free or low oxygen atmosphere using electric heaters 36 and microwave irradiation and further using heating means using superheated steam; a catalytic gas purification device 3 which purifies decomposition gas generated in the continuous carbonization apparatus 2; and a hydrogen chloride absorption column 4 which removes hydrogen chloride generated by the pyrolysis of the coated wire 14. The continuous carbonization apparatus 2 includes a one stage or two or more stages pyrolysis chamber 30. The pyrolysis chamber 30 is provided with rotatable eccentric plates having a fire grate directly receiving the coated wire 14, and a coat is carbonized and peeled at a plate part.

Description

  The present invention relates to a coated electric wire recycling system that recovers valuable copper as a resource from a coated electric wire contained in discarded automobiles, home appliances, and the like by a thermal decomposition method with low processing cost and low environmental load.

The discarded covered electric wire contains copper, the covering material of the copper is removed, and only the copper content is recovered and reused.
The recycling of copper can reduce the amount of natural resources used, and can also be expected to have various effects such as energy saving and reduction of greenhouse gas emissions.
Further, most of the coverings of the covered electric wires are made of polyvinyl chloride, and the polyvinyl chloride can be recycled by a thermal decomposition method at an appropriate temperature. In addition, polyvinyl chloride accounts for about half of the weight by weight of chlorine, and it has less impact on the environment because it emits less carbon dioxide than other petroleum-based plastics. Effective use is also possible by processing it appropriately.

A general method for recovering copper from a covered electric wire is a nugget treatment, chopping and sorting by specific gravity, and then separating and recovering the resin coating and copper (see, for example, Patent Document 1).
In addition, as a method of recycle and reuse discarded coated wires, a method of exhausting exhaust gas containing hydrogen chloride gas generated by the thermal decomposition of polyvinyl chloride, and recovering hydrochloric acid from the exhaust gas and effectively reusing it There is a method (for example, refer to Patent Document 3) in which the resin coating is carbonized by dry distillation using a rotary kiln.

Japanese Patent Laid-Open No. 2002-75094 Japanese Patent Laid-Open No. 11-188335 JP 2009-249665 A

  The nugget processing method of Patent Document 1 has problems such as oil adhering to the coated surface of the covered electric wire recovered from the automobile, and many thin wires tend to get tangled, and copper separation accuracy cannot be increased by specific gravity sorting. is there. As described in the patent document, “Nugget treatment separates the conductor and the resin (insulator) and separates and separates it into a conductor component and a resin component through a vibration separator. Is put into the liquid again and separated by specific gravity and re-separated into conductors and resin component contaminants and pure resin components, so that the recycling cost increases to completely recover copper.

  In the dry distillation process of Patent Document 2, exhaust gas containing hydrogen chloride gas generated by the thermal decomposition of polyvinyl chloride is discharged, hydrochloric acid is recovered from the exhaust gas, and is reused, and then the exhaust gas is processed by combustion or the like. In general, when recovering hydrochloric acid from hydrogen chloride, it is absorbed in water, but the pyrolysis gas generated during the dry distillation process generates hydrocarbon gas in addition to hydrogen chloride at the same time. When the gas is cooled, tar components and the like are mixed with hydrochloric acid. Therefore, there is a problem that a large amount of cost is required for the removal treatment facility to recover and effectively use pure hydrochloric acid.

  The rotary kiln method of Patent Document 3 requires a work and a pretreatment device for chopping the covered electric wire at the time of charging, and thus the labor and facility costs increase. Further, since the rotary kiln is a cylindrical rotary furnace, there are problems such as a complicated structure such as a sealing measure for preventing gas leakage at the rotating end and preventing air inflow.

In order to solve the above-mentioned problems, the present invention has made extensive efforts for development, and as a result, has come up with a coated wire recycling system having the following configuration.
According to a first aspect of the present invention, there is provided a continuous carbonization apparatus for thermally decomposing a coated electric wire using an electric heater and a heating means by microwave irradiation in a non-low oxygen atmosphere to separate and recover the coating material and the copper wire, A covered wire recycling system comprising a catalytic gas purification device for purifying cracked gas generated in a carbonization device and a hydrogen chloride absorption tower for removing hydrogen chloride generated by thermal decomposition of the covered wire. .

  The continuous carbonization apparatus according to claim 2 includes a covered electric wire supply chamber for storing a covered electric wire, a pyrolysis chamber for thermally decomposing and carbonizing the covered electric wire supplied from the covered electric wire supply chamber, and a coating after the pyrolysis. It is comprised from the cooling chamber which cools an electric wire, The recycling system of the covered electric wire described in Claim 1 characterized by the above-mentioned.

  The continuous carbonization apparatus according to claim 3 has a thermal decomposition chamber of one stage or two or more upper and lower stages, and the thermal decomposition chamber includes a grate that directly receives a covered electric wire and thermally decomposes. It is a recycling system of the covered electric wire described in any 1 paragraph of Claims 1-2.

  The pyrolysis chamber of the continuous carbonization apparatus according to claim 4 is provided such that a plurality of electric heaters are arranged on the side surface of the grate so as to surround the outside of the covered wire, and heat is applied to the covered wire from the entire side surface of the grate. It is comprised by these, The recycling system of the covered electric wire described in any one of Claims 1-3 characterized by the above-mentioned.

  The pyrolysis chamber of the continuous carbonization apparatus according to claim 5 is provided with a microwave irradiation port using microwave irradiation as a heating means. This is a coated wire recycling system.

  The thermal decomposition chamber of the continuous carbonization apparatus according to claim 6 is provided with a superheated steam spraying port in addition to heating by an electric heater and microwave irradiation, and the covered electric wire is heated by the superheated steam. The recycling system of the covered electric wire described in any one of -5.

  The pyrolysis chamber of the continuous carbonization apparatus according to claim 7 is a pair of eccentric plates constituting a grate that directly receives a covered electric wire and pyrolyzes, and is configured to be able to rotate simultaneously with the rotation of two axes. The covered electric wire recycling system according to any one of claims 1 to 6.

  The eccentric plate of the pyrolysis chamber according to claim 8 is symmetrical, and the thermal separation at the time of stopping is in a state where the distance between the left and right is the narrowest, so that the covered electric wire thermally decomposing on the eccentric plate does not fall. At the point of time when the thermal decomposition of the covered electric wire is completed, the eccentric plate of the portion where the covered electric wire is in direct contact with each of the eccentric plates is gradually widened with the rotation. The covered wire recycling system according to claim 7, wherein the covered wire is configured to be widest when rotated 180 degrees and the covered wire falls downward.

  According to claim 9, in the upper or lower two-stage or more pyrolysis chamber, when the eccentric plate of the lower pyrolysis chamber rotates and returns to a fixed position and stops, the eccentric plate of the upper pyrolysis chamber rotates, When pushed down, dropped onto the eccentric plate of the lower pyrolysis chamber, the eccentric plate of the upper pyrolysis chamber rotates and returns to a fixed position and stops. It falls on the eccentric plate of this, and is supplied, It is the recycling system of the covered electric wire described in any one of Claims 1-8 characterized by the above-mentioned.

  The covered electric wire supply chamber for receiving the covered electric wire according to claim 10 is supplied by using a covered electric wire supply device including a bucket for storing the covered electric wire. This is a recycled system for covered electric wires.

  The covered electric wire supply chamber for receiving the covered electric wire according to claim 11 is provided at the uppermost part of the thermal decomposition chamber, temporarily holds the covered electric wire supplied from the covered electric wire supply device, and receives the covered electric wire from the covered electric wire supply device The wire receiving port and a covered wire transfer port for transferring the covered wire to the pyrolysis chamber, wherein each port is configured to be sealed by a door. It is the recycling system of the covered electric wire described in the item.

  The covered electric wire supply chamber for receiving the covered electric wire according to claim 12 opens the outside air door of the covered electric wire supply chamber while the bucket of the covered electric wire supply device is rising, receives the covered electric wire from the raised bucket, and completes the insertion of the covered electric wire. After that, the covered electric wire recycling system according to any one of claims 2 to 11, wherein the outside air door of the covered electric wire supply chamber is sealed.

  The covered electric wire supply chamber for receiving the covered electric wire according to claim 13 is configured such that both the doors on the pyrolysis chamber side and the covered electric wire receiving side during storage of the covered electric wire are sealed with respect to the outside air side and the pyrolysis chamber side. When opening the door when receiving the covered electric wire, the door inside the pyrolysis chamber is closed, so that outside air does not flow into the pyrolysis chamber and gas leakage from the inside does not occur. The covered electric wire recycling system according to any one of claims 2 to 12.

  The covered electric wire supply chamber for receiving the covered electric wire according to claim 14 has a cradle on which the covered electric wire is placed, and when the covered electric wire is transferred into the pyrolysis chamber, the door is opened and the vertical state is changed according to the opening of the door. Rotate to the state, drop the covered wire from the cradle to the grate in the pyrolysis chamber, close the door after the fall of the covered wire, the cradle returns to its original state, and the covered wire from the next covered wire feeder The covered electric wire recycling system according to any one of claims 2 to 13, wherein preparation for receiving the electric wire is completed.

  The cooling chamber that cools the coated electric wire after pyrolysis according to claim 15 has a coated electric wire receiving port from the thermal decomposition chamber and an outlet for taking out the coated electric wire to the outside, and each opening is sealed by a door, It is comprised so that opening and closing is possible, The recycling system of the covered wire | conductor described in Claim 2 characterized by the above-mentioned.

  The cooling chamber for cooling the pyrolyzed coated electric wire according to claim 16 has a cradle for placing the pyrolyzed coated electric wire, and the covered electric wire is directly placed on the cradle by opening the door of the cooling chamber receiving port. While the wires are being cooled, the lids of both doors are closed and the room is sealed against the outside air side and the pyrolysis chamber side.When the door is opened at the time of removal, the door inside the pyrolysis chamber is kept closed. In order to prevent the inflow of outside air into the pyrolysis chamber and gas leakage from the inside, the door on the outside air side is sealed when the covered electric wire is transferred to the cooling chamber. The covered electric wire recycling system according to any one of claims 2 to 15, wherein gas is not leaked from the air.

  A catalytic gas purification device for purifying cracked gas generated in a continuous carbonization device according to claim 17, wherein an oxidation catalyst layer that oxidizes a gas other than hydrogen chloride among cracked gas generated in the continuous carbonization device and an unreacted catalyst layer The covered electric wire recycling system according to any one of claims 1 to 16, characterized by comprising a gas combustion chamber in which carbon monoxide and hydrocarbons are flame-combusted.

  19. A hydrogen chloride absorption tower for removing hydrogen chloride generated by thermal decomposition of a coated electric wire according to claim 18, wherein the neutralizing agent for sodium hydroxide solution neutralizes and detoxifies hydrogen chloride out of the gas sucked from the catalyst gas purification device. A tank, a pump for circulating the neutralizing agent solution in the neutralizing agent tank, a shower for spraying the neutralizing agent solution circulated by the pump, and the neutralizing agent solution sprayed from the shower are fed from below. The recycle system for covered electric wires according to claim 1, further comprising a demister part for mixing hydrogen chloride.

1) The present invention does not require a shredding process as in the case of nugget processing, simplifies the pre-processing process, and enables short-time processing, enabling mass processing and recovering almost 100% of copper from the covered wire. This can reduce the recycling cost.
2) In the present invention, a copper and coating recycling system has already been cut by a nugget machine or the like, whereas a thin line or a rough line that is difficult to recycle due to economic factors is unresolved. Targeting automobile harnesses that are disposed of in large quantities, such as wires, helps to further use resources and preserve the environment.
3) The present invention employs a thermal decomposition method in which the coated electric wire is controlled by appropriate heat treatment and temperature, and the coating is mainly made of polyvinyl chloride, so that the pyrolysis gas is used in comparison with other resins. This is an effective treatment method with a small amount of CO ₂ emission.
4) In the present invention, in the pyrolysis process, the movement between the covered wires in the process steps is moved up and down, so that no conveying means is required and heat rising air current can be used, and power and heat sources can be saved. There is energy saving effect. Further, the space of the apparatus can be saved by moving the covered electric wire up and down.
5) The present invention can easily separate and recover the carbonized coating and the copper wire by pyrolyzing the coated electric wire to carbonize the coating and rotating and crushing the eccentric plate of the grate. it can.
6) Hydrocarbon gases generated during the dechlorination process of polyvinyl chloride are produced by complete combustion by catalytic combustion or flame combustion, and then neutralizing hydrogen chloride with sodium hydroxide solution using a hydrogen chloride absorption tower. The sodium chloride was reused or absorbed in water to make hydrochloric acid for reuse.
7) The pyrolysis chamber of the present invention has a structure in which there is no hindrance to pyrolysis even if the covered electric wires are inserted in a state of being entangled together at a predetermined volume, and there is no hindrance to sending out to the next process.
8) The grate part of the thermal decomposition chamber of the present invention also has a function of removing the covering after decomposition, reducing the covering removal work after taking out to the outside air, and separating the copper and the resin part of the covered electric wire. It can be done reliably at low cost.
9) Since most of the covering material is removed from the taken-out covered electric wire by the grate part of the pyrolysis chamber, it can be separated by simply passing the pressure through a vibrating screen or a pinch roller.

Hereinafter, the recycling system of the covered electric wire in one embodiment of the present invention is explained based on a drawing.
(Recycling system)

FIG. 1 is a schematic view of a coated wire recycling system showing an embodiment of the present invention. The solid arrow line indicates the movement of the covered electric wire, and the dotted arrow line indicates the gas flow.
In FIG. 1, a coated wire recycling system 1 according to the present invention includes a coated wire 14 supplied from a coated wire supply device 5 that is insulated from outside air and thermally decomposed by heating in a non- (low) oxygen atmosphere. A continuous carbonization device 2 that separates and collects the copper wire inside, a catalyst gas purification device 3 that purifies the cracked gas generated from the coated wire when it is heated and thermally decomposed by the continuous carbonization device 2, It is comprised from the hydrogen chloride absorption tower 4 which removes the hydrogen chloride which generate | occur | produces from thermal decomposition.
(Coated wire feeder)

The coated electric wire supply apparatus of this invention is an apparatus for automatically supplying the coated electric wire to process to a continuous carbonization apparatus, and is comprised from the bucket which accommodates a covered electric wire, and a raising / lowering mechanism.
FIG. 2A is a schematic diagram showing a part of the structure of the covered electric wire supply device, and is a schematic plan view showing an elevating mechanism in which the bucket body is attached to the chain. FIG. 2B is a schematic side view thereof. FIG. 2D is a schematic side view of the lifting mechanism showing a state in which the covered electric wire is put into the continuous carbonization apparatus from the bucket.

  In FIG. 2A to FIG. 2D, the covered electric wire supply device 5 has two columns of columns 6 that stand vertically, and bearings 7 are fixed to the both left and right side surfaces of the columns 6 with bolts 71. A rotating shaft 8 is rotatably attached to each bearing 7. A sprocket 10 for driving the chain 9 is fixed to the rotary shaft 8 in two rows, and the chain 9 is fitted into the sprocket 10 in an endless manner.

  The bucket body 11 has brackets 12 projecting horizontally to the center of rotation on the column side on both sides thereof, and both brackets 12 are connected to one end of the chain 9 by bolts 71 respectively. The bucket body 11 can be moved up and down by driving 8.

  The two rows of chains 9 to which the bucket body 11 is attached are sandwiched between the guide plates 13 that prevent the bucket 11 from swinging. Further, two guide rollers 19 are attached to both ends of the lower portion of the bucket 11 so that the guide rollers 19 can be raised while maintaining the posture of the bucket 11 along one guide surface sandwiching the chain 9. It is configured.

The movement of the covered electric wire 14 between the steps of supplying the covered electric wire 14 to the pyrolysis chamber of the continuous carbonization apparatus 2, moving in the pyrolysis chamber and taking out after the pyrolysis is performed by dropping the covered electric wire. ing. The continuous carbonization device 2 is composed of a vertically long structure, and the supply of the covered electric wire 14 is performed by the covered electric wire supply device 5.
The covered wire is put into the continuous carbonization apparatus 2 by using the bucket 11 of the covered wire supply device 5 provided at a position where it can be manually inserted (about 800 mm from the floor surface), and a predetermined amount of the covered wire 14 is put in the bucket 11 in advance. Done.

  The electric motor 15 of the covered electric wire supply device 5 is driven by an electric command from the continuous carbonization device 2, and the bucket 11 connected to the chain 9 is raised by the drive, and the upper outside air door 16 of the continuous carbonization device 2 is raised during the raising. To open the cover 11 (see FIG. 2D), tilt the bucket 11 until the covered wire 14 slips due to gravity between the upper limit and the upper limit of the raised bucket 11, and the covered wire is supplied to the covered wire supply chamber 20. After completion of charging, the bucket 11 is lowered to seal the upper outside air door 16 of the continuous carbonization apparatus.

  It is not necessary to chop the covered electric wire into the bucket 11, and it is manually inserted in a tangled state. Preferably, a jig 17 having the same size as the bucket is used, and a covered electric wire is put into the jig 17 and bound with a PP band made of resin or the like. Even if the covered electric wire is taken out from the jig 17, it does not collapse and the shape is stable. The PP band made of resin can be pyrolyzed and carbonized in the continuous carbonization apparatus 2.

The front end shape of the bracket body 12 protruding horizontally to the center of rotation on the column 6 side on both side surfaces of the bucket body 11 has U grooves 18 having the same dimensions as the rotation shaft 8 so as to fit into the rotation shaft 8 (see FIG. 2B). The bucket 11 in which the covered electric wire 14 is put rises, the bracket 12 projecting horizontally to the center of the rotating shaft on the column 6 side reaches the upper rotating shaft 8 on both sides of the main body of the bucket 11, and reaches the upper rotating shaft 8. After being fitted to the rotating shaft 8, when driven as it is, the bracket 12 of the bucket 11 moves from the horizontal position to the vertical centering on the upper driving rotating shaft 8 (see FIGS. 2C and 2D). During this time, the covered wire 14 in the bucket 11 is completely charged into the covered wire supply chamber of the continuous carbonization apparatus 2. When the bucket 11 moves around the upper drive rotating shaft 8, the movement of the guide roller 19 of the bucket 11 is restricted by the guide plate 13.
(Continuous dry distillation equipment)

The continuous carbonization apparatus of the present invention includes a covered electric wire supply chamber that temporarily stores a bundled covered electric wire, a thermal decomposition chamber that thermally decomposes and carbonizes the covered electric wire supplied from the covered electric wire supply chamber, When the covered electric wire is exposed to the outside air in a high temperature state after decomposition, it is likely to come into contact with oxygen in the air and ignite.
(Coated wire supply room)

  FIG. 3A is a schematic view showing a covered electric wire supply chamber of the continuous carbonization apparatus of the present invention, and is a schematic side view showing a state where the covered electric wire is stored in the covered electric wire supply chamber. FIG. 3B is a case where the covered electric wire is stored in the covered electric wire supply chamber. FIG. 3C is a schematic side view of the covered wire supply chamber showing a state where the covered wire falls from the covered wire supply chamber into the pyrolysis chamber.

3A to 3C, the covered wire supply chamber 20 is a room that is provided in the upper part of the thermal decomposition chamber and temporarily holds the covered wire supplied from the covered wire supply device 5.
The covered wire supply chamber 20 is provided with a covered wire receiving port 21 for receiving the covered wire from the covered wire supplying device 5 and a covered wire receiving port 22 for transferring the covered wire into the pyrolysis chamber. Each mouth is sealed by doors 23 and 24. A drive shaft 25a is fixed to one side of the door, and the drive shaft 25a is inserted into a bearing 26 so as to be rotatable. The door is directly connected to an electric motor or the like to swing and open and close.

  The doors 23 and 24 are closed during the storage of the covered electric wire, and the room is hermetically sealed with respect to the outside air side and the pyrolysis chamber 30 side through the packing 27 and the like. In addition, when the door 23 is opened at the time of receiving the covered electric wire, the door 24 inside the pyrolysis chamber 30 is in a closed state so that the outside air does not flow into the pyrolysis chamber 30 and gas leakage from the inside does not occur. Has been. Furthermore, when the covered electric wire is transferred into the thermal decomposition chamber 30, the door 23 on the outside air side is sealed so that the inflow of outside air and gas leakage from the inside do not occur.

  A receiving base 28 on which the covered electric wire is placed is provided in the covered electric wire supply chamber, and the receiving base 28 is a plate material that is formed in a semicircular shape so that the covered electric wire can be stably placed when viewed from the side. Both side plates of the circular plate material are formed in a substantially circular shape, and are surrounded so that the covered electric wires do not protrude outside. Bearing holes 29 are provided on both lower sides of the decomposition chamber side of the semicircular plate material constituting the cradle 28, and a fulcrum shaft 25 b is passed through the bearing holes 29. Both ends of the fulcrum shaft 25 b are fixed to both outer frames of the covered wire supply chamber 20. Further, a pin 32 is attached near the center of the circular side plate of the cradle 28, and the door 24 and the cradle 28 are connected via a link 33.

When the covered electric wire 14 is transferred into the thermal decomposition chamber 30, when the door 24 is opened by an electric motor or the like, the cradle 28 on which the covered electric wire 14 connected to the door 24 is placed becomes a fulcrum shaft 25b as the door is opened. , And the covered wire 14 is reliably dropped from the cradle 28 to the grate in the pyrolysis chamber 30.
When the door 24 is closed after the covered wire is dropped, the cradle 28 also returns to its original state, and preparation for receiving the covered wire from the next covered wire supply device is completed.
(Pyrolysis chamber)

  FIG. 4A is a schematic view showing a pyrolysis chamber of the continuous carbonization apparatus of the present invention, a schematic side view showing a state where a covered electric wire is placed on a grate constituting a fire bed portion of the pyrolysis chamber, and FIG. FIG. 4C is a schematic plan view showing the state where the covered electric wire is placed on the grate, FIG. 4C is a schematic plan view thereof, and FIG. 4D is a schematic view showing the state where the covered electric wire is crushed (crushed) and dropped by the rotation of the grate 35. FIG.

4A to 4D, a plurality of rod-shaped electric heaters 36 are arranged on the side surfaces of the grate 35 constituting the firebed portion 34 as heating means in four vertical directions so as to surround the covered electric wire 14 from the outside, Heat is applied to the covered electric wire 14 from the entire side surface.
Moreover, since the covered electric wire 14 does not protrude outside the grate 35 by arranging the rod-shaped electric heaters 36 in the vertical direction on the four sides, the covered electric wire 14 can be smoothly dropped after the thermal decomposition. .
Further, guide plates 37 are arranged at alternate pitches with the rod-shaped electric heater 36 from the inner surface of the frame plate 43 of the pyrolysis chamber 30 to the inside of the rod-shaped electric heater 36 toward the center side, and the covered electric wire 14 is centered. The rod-shaped electric heater 36 is protected by acting as a stopper when it is displaced from the portion.

  In the pyrolysis chamber 30, in addition to the heat source of the rod-shaped electric heater 36, microwave irradiation is used as a heating means, and a microwave irradiation port 40 is provided in order to shorten the thermal decomposition time of the covered electric wire 14. And is connected to the magnetron 41 and the waveguide 42. Further, the pyrolysis chamber 30 is provided with a nitrogen gas inlet (not shown) for supplying an inert gas such as nitrogen gas in order to reduce the oxygen concentration to make an inert atmosphere.

Further, a superheated steam supply pipe 68 connected to a superheated steam generator is provided as a heating means in the pyrolysis chamber, and superheated steam is sprayed onto the coated electric wire from a superheated steam spraying port 70 connected to the superheated steam supply pipe. It is configured to be.
Most of the covering material of the covered electric wire is made of polyvinyl chloride, and it is known that the polyvinyl chloride has a large dielectric power factor among main plastics and has high energy absorption by dielectric heating. This is because polyvinyl chloride is relatively easy to heat by dielectric heating. In other words, the heating of the electric heater moves from the surface to the inside, whereas the irradiation with microwaves generates heat from the inside of the polyvinyl chloride, so the heating rate is higher than that of the electric heater alone. Increase greatly. When polyvinyl chloride used as a covering material for a covered electric wire is heated, dechlorination occurs up to around 350 ° C. and hydrogen chloride gas is generated. At higher heating, dechlorination does not occur and a hydrocarbon gas is generated. When the temperature reaches about 600 ° C., the generated gas is terminated and completely carbonized.

  From the above, it is preferable to control the electric heater 36 so that a temperature sensor is attached in the thermal decomposition chamber 30 of the present invention and the decomposition chamber is constantly maintained at a temperature of about 350 ° C. or lower. In addition, the decomposition time is set to a time during which thermal decomposition can be appropriately performed by timer control, and after the set time, the eccentric plate 38 of the grate 35 constituting the firebed portion 34 is driven by an electric motor to rotate, and the covered electric wire is processed in the next step. Proceed to Furthermore, the microwave irradiation time is also controlled by a timer, and set to a time during which the coated wire can be dechlorinated.

The microwave setting time is set to be shorter than the thermal decomposition time because dechlorination does not occur even if the microwave is irradiated more than necessary and the energy cost increases.
One (one stage) or two (two stages) or more pyrolysis chambers may be provided, but it is preferable to provide two or more pyrolysis chambers. In this case, it is preferable that the temperature setting of the upper pyrolysis chamber is a preheating step before thermal decomposition at 200 ° C. or lower does not occur. In addition, in the preheating of the pyrolysis chamber provided in the upper stage, there is heat propagation due to the heat rising air flow from the lower pyrolysis chamber, so that the temperature setting of the electric heater provided in the upper stage can be set lower and energy can be saved. The microwave irradiation port 40 may be provided in both the upper and lower pyrolysis chambers 30, but may be provided in either one of the pyrolysis chambers 30.

  The atmosphere in the pyrolysis chamber 30 includes a copper wire in the covered electric wire to be pyrolyzed, so that the copper wire may be sparked by the microwave irradiation, causing the temperature to rise rapidly and ignite. It is desirable to reduce as much as possible, preferably in an oxygen-free state.

Accordingly, the entrances 21 and 22 of the covered wires to the thermal decomposition chamber 30 are configured as double doors 23 and 24 so that outside air does not easily flow into the thermal decomposition chamber 30. Further, a portion where there is a concern about the inflow of outside air, such as a bolt joint portion of the pyrolysis chamber 30 itself or an inspection lid, has a sealed structure without gas leakage and air inflow through packing or the like. Preferably, during pyrolysis, it is desirable to supply an inert gas such as nitrogen gas to the pyrolysis chamber to reduce the oxygen concentration and to create an inert atmosphere.
(Grate)

The continuous carbonization apparatus 2 of the present invention is preferably provided in two upper and lower stages for shortening the thermal decomposition time of the coating resin as described above, but may be provided with one or three or more stages of pyrolysis chambers. In each of the upper and lower two-stage pyrolysis chambers, there are provided grate 35 that directly receives the covered electric wires and thermally decomposes them. A fire floor portion 34 is constituted by the grate 35.
In the grate 35, a bearing 44 is fixed to a frame plate 43 of the pyrolysis chamber with bolts, and two rotary shafts 45 are inserted horizontally and parallel to the bearing 44.

  The rotary shaft 45 in the portion that penetrates the pyrolysis chamber frame plate 43 is configured to be guided and rotated by a bearing 44, and each of the shafts 45 can be rotated reversely via a gear 46 on the outside. The shaft 45 is connected to the electric motor 47 via the coupling 48, and the other rotating shaft end protrudes outward, and a detector 49 or the like is attached to control the stop position after rotation by the electric motor 47. Has been.

  A circular eccentric plate 38 (diameter of about 10 mm) that constitutes a grate 35 that directly receives a covered electric wire and thermally decomposes is provided on both of the rotary shafts in the pyrolysis chamber, and a gap (about 50 mm) at a constant interval in each rotary shaft direction. ) Are arranged in a plurality (13 in the embodiment) and can be rotated simultaneously with the rotation of two axes. When one shaft is rotated by the electric motor 47 or the like, the other shaft can be simultaneously rotated in the reverse direction via a gear. In the present invention, the eccentric plate 38 is formed in a circular shape, but a notch portion is formed in a part of the outer peripheral surface of the eccentric plate so that the eccentric plate is carbonized when rotating. Crushing can be facilitated. An eccentric plate having such a notched portion is also within the scope of the present invention.

  The eccentric plate 38 constituting the grate is symmetrical in the left-right direction, and the distance between the left and right is the narrowest during thermal decomposition at the time of stoppage. Even if pyrolysis is performed on the eccentric plate (grate) 38, the covered electric wire falls. It is configured with no gap. When the thermal decomposition of the covered electric wire is finished, when the eccentric plate (grate) 38 facing each other by the electric motor 47 or the like is rotated once inward, the portion directly in contact with the covered electric wire between them is the eccentric plate (grate). ) As the rotation of 38, the interval gradually increases and becomes the widest at the point of rotation of 180 degrees (see FIG. 4D). At this time, the covered wire 14 falls downward.

  As a specific example, the outer diameter of the bundled covered electric wire 14 is formed to be about 400 mm, and the diameter of both eccentric plates (grate) is 400 mm, the distance between the axes is 540 mm, and the eccentric amount of the eccentric plate (grate). Are each 50 mm. Therefore, the minimum dimension of the center gap of the distance between the outer surfaces of the eccentric plates (grate), which is a gap as the eccentric plate (grate) 38, is 40 mm, and the maximum dimension of the center gap is 240 mm.

When the gap between the center portions during thermal decomposition, which is the minimum dimension between the outer surfaces of the eccentric plates (grate), is 40 mm, the covered electric wires 14 are intertwined and there is no fear of natural fall, and the eccentric plate is fired as a grate. A floor 34 is formed.
In addition, when the gap at the central portion of the distance between the outer surfaces of the eccentric plates (grate) is 240 mm, the outer diameter of the bundled covered electric wire 14 is 400 mm and the size is 160 mm larger. The volume of the wire is softened or carbonized by pyrolysis and is vaporized by gasification, so the volume of the covered wire is reduced, and the coating resin itself is the eccentric plate. It is easily crushed and peeled off by rotating motion.

  Furthermore, since it rotates so that it may push with an eccentric plate, gravity is also added and coating resin can fall easily below. Optimally, when the eccentric plate is rotated twice or more, the covered electric wire 14 can be surely dropped in a state of being separated into the coated resin and the electric wire, and a part of the covered electric wire 14 does not remain on the eccentric plate.

Such a peeling method and a dropping method of the covering material from the covered electric wire 14 using the rotation of the eccentric plate and the dropping method also have the purpose of peeling the resins from the covered electric wire 14 of the present invention. This is also convenient because it peels off in advance in the pyrolysis chamber.
In addition, if the operation of rotating the eccentric plate from the fixed position to about 90 degrees before dropping after the end of the thermal decomposition and then returning to the fixed position is repeated several times, the covered electric wire 14 is dropped and dropped little by little to remove the carbide. As a result, the carbide removal work after the covered electric wire 14 is taken out is further reduced.

As described above, the adoption of the eccentric plate structure has both a role as a grate, a function of dropping the covering material and the content metal wire to the next process, and a function of removing carbide after the thermal decomposition of the covered electric wire 14.
(Thermal decomposition of coated wire)

  When the pyrolysis end time set appropriately by the timer is reached, first, the eccentric plate 38 of the lower pyrolysis chamber rotates and the carbonized coated wire 14 is pushed downward, and also serves as a cooling chamber inlet door at the bottom of the pyrolysis chamber. It falls to the cradle part and waits until there is no remaining gas at a predetermined time within the range of the time when the next thermal decomposition ends. This is because even if the coated electric wire 14 is cooled after given heat, gas is generated for a certain period of time.

  In addition, the ambient temperature in the vicinity of the cradle part that also serves as the cooling chamber inlet door at the bottom is less affected by heat conduction because it is located in the lower part away from the electric heater, and is considerably lower than the temperature at which the covered wire 14 is re-pyrolyzed So there is no problem. Furthermore, although microwaves are also irradiated, dechlorination prevents the microwaves from being absorbed and does not increase the temperature.

  When the eccentric plate of the lower pyrolysis chamber rotates and returns to a fixed position and stops, the eccentric plate 38 of the upper pyrolysis chamber rotates and the covered wire 14 is pushed downward and falls onto the eccentric plate of the lower pyrolysis chamber. To do. When the eccentric plate of the upper thermal decomposition chamber rotates and returns to a fixed position and stops, the covered electric wire 14 before decomposition falls on the upper eccentric plate and is supplied from the covered electric wire supply chamber, and thermal decomposition starts anew.

The start of pyrolysis starts from the start of microwave irradiation, and the microwave irradiation time is set by a timer with an appropriate time setting and ended when the time is up. At the same time, the thermal decomposition time is set by a timer with a time setting appropriately set based on the decomposition temperature or the like, and ends with a predetermined set time. For example, when the setting of the thermal decomposition time is 20 minutes, the microwave irradiation time is 5 to 10 minutes. Actually, an appropriate time is set by looking at the thermal decomposition state of the covered wire 14.
(Cooling room)

  FIG. 5A is a schematic side view showing a state where the pyrolyzed covered electric wire falls into the cooling chamber, and FIG. 5B is a schematic side view showing a state where the cooled pyrolyzed electric wire and the covering material are discharged from the cooling chamber. FIG.

  The cooling chamber 50 has a covered wire receiving port 51 from the thermal decomposition chamber and an outlet 52 for taking out the covered wire 14 to the outside, and the respective ports are sealed by doors 54 and 56. A drive shaft 58a is fixed to one side of the door. The drive shaft 58a is inserted into a bearing so as to be rotatable, and is configured to be directly connected to an electric motor or the like to be swinged and opened.

In the cooling chamber 50, there is a cradle 60 on which the pyrolyzed coated electric wire is placed. The covered electric wire is directly placed on the pedestal 60 by opening the door 54 of the cooling chamber receiving port. The shape of the cradle 60 is a semi-circular plate so that the covered electric wire can be stably placed when viewed from the side. Both side plates of the semi-circular plate are formed in a substantially circular shape, and the covered electric wire and carbide are outside. It is enclosed so that it does not protrude. The semi-circular plate material that is the pedestal 60 has bearing holes 62 on both sides on the lower side on the outer door side, the bearing 62 passes through a fulcrum shaft 58, and both ends of the fulcrum shaft are fixed to both outer frames of the cooling chamber. Yes.
Further, a pin 64 is attached near the center of the circular side plate of the cradle 60, and the external door 56 and the cradle 60 are connected via a link 66.

  During cooling of the covered electric wire 14, the cooling chamber 50 closes the lids of the doors 54 and 56 and seals the inside of the room from the outside air side and the pyrolysis chamber side via a packing material 57 and the like. Further, when the door at the time of taking out is opened, the door 54 on the pyrolysis chamber side is closed, so that no outside air flows into the pyrolysis chamber and no gas leaks from the inside. Furthermore, when the covered electric wire 14 is transferred into the cooling chamber 50, the outside air side door 56 is sealed, so that the outside air inflow and the gas leakage from the inside do not occur. Further, the pyrolysis gas generated in the decomposition chamber at this time is always sucked by a suction fan from the outside of the continuous carbonization apparatus, so that the gas does not enter the cooling chamber.

  The timing to the cooling chamber of the covered electric wire in which the gas is calmed may be performed at the end of the thermal decomposition, or may be performed at the end of the appropriately set microwave irradiation before that. In any case, it is necessary to determine when the gas emission has completely ended.

  The role of the cooling chamber 50 is to cool for a certain time because there is a risk of igniting by touching oxygen in the air when the covered electric wire is exposed to the outside air in a high temperature state after pyrolysis. When the coating material after pyrolysis is cooled to approximately 200 ° C. or less, problems such as ignition do not occur. In the pyrolysis chamber, the temperature of the covering material and the electric wire immediately after being taken out is 100 ° C. or less because the gas is cooled while the generation of the decomposition gas ends for a certain period of time. The timing of taking out the covering material and the electric wire may be set by a timer after being supplied from the thermal decomposition chamber to the cooling chamber.

When the outer cover 56 is opened with an electric motor or the like when the covered electric wire is taken out, the cradle 60 on which the covered electric wire is placed is connected to the outer door 56 from the horizontal state around the fulcrum shaft 58 as the door is opened. It rotates to 90 degrees in the vertical state, and the covered electric wire can be reliably taken out from the cradle 60. When the outer door 56 is closed after the covered electric wire is taken out, the cradle 80 also returns to its original state, and preparation for receiving the covered electric wire from the next thermal decomposition chamber is completed.
(Gas absorption method)

When a coated electric wire mainly composed of polyvinyl chloride is thermally decomposed at a temperature of about 350 ° C. in a no-oxygen atmosphere, CO gas, hydrogen chloride gas, and hydrocarbon gases are generated.
In these gas treatments, the catalyst is oxidized and burned in a combustion chamber at 800 ° C. or higher. The hydrogen chloride gas is neutralized by spraying and absorbing a sodium hydroxide solution in a hydrogen chloride absorption tower.
(Catalyst gas purification device)

  FIG. 6 is a schematic view showing the catalyst gas purification device 3 and the hydrogen chloride absorption tower 4 showing an embodiment of the present invention. The catalytic gas purification device 3 is an oxidation catalyst layer 76 that oxidizes a gas excluding hydrogen chloride among cracked gas generated in a continuous carbonization device, and flame oxidation of unreacted carbon monoxide and hydrocarbons in the oxidation catalyst layer 76. And a gas combustion chamber 82 to be made.

The catalytic gas purification device 3 has a fan 72 for sucking gas at the outlet side thereof, and allows hydrocarbon gases, carbon monoxide and hydrogen chloride generated in the continuous carbonization device to pass through, and removes gases other than hydrogen chloride. Purify.
Gases sucked from the continuous carbonization apparatus flow in at a low temperature of 200 ° C. or lower, and the gas sucked from the air intake 74 is mixed into the gas to form a gas containing oxygen, and an oxidation catalyst layer 76 located at the bottom of the apparatus is formed. Let it pass. An electric heater 80 is provided at the entrance of the oxidation catalyst layer, and the following reaction occurs when the temperature is raised beforehand by the electric heater 80a to about 350 ° C. at which the oxidation catalyst 78 undergoes an oxidation reaction.
CxHy + O ₂ → CO ₂ + H ₂ O + (heat of reaction)
CO + O ₂ → CO ₂ + (heat of reaction)

  Hydrocarbons and carbon monoxide can be purified by reacting with oxygen to form carbon dioxide or water vapor and generating reaction heat. In addition, the unreacted gas and hydrogen chloride gas in the oxidation catalyst layer 76 are separated from hydrocarbons in the gas combustion chamber 82 when the electric heater 80 b provided at the gas combustion chamber inlet is heated to 800 ° C. or higher in advance. Carbon monoxide is completely burned by flame combustion. Since hydrogen chloride gas does not burn, it passes as it is.

  The upper structure of the gas combustion chamber 82 is constituted by a gas flow that can exchange heat with a low-temperature gas flowing from the continuous carbonization apparatus and a high-temperature gas generated by combustion. Further, the burned gas passes through the gas cooling carrier 84 composed of the ceramic carrier while being retained, takes heat, takes outside air there, cools the burned gas, and the fan 72 and the hydrogen chloride absorption tower. The temperature of the gas flowing into 4 is lowered in advance.

  The reason why the oxidation catalyst is used in combination with the gas combustion chamber in the catalytic gas purification device 3 is that the pyrolysis gas may be purified only by flame combustion by installing an afterburner or the like. At about 350 ° C, a large amount of hydrogen chloride is generated, and the amount of combustible gas of hydrocarbons is relatively small, and the amount of gas generated is uneven and unstable. Since fuel is constantly burned, fuel may be wasted.

Therefore, by adopting a catalytic oxidation method using a catalyst supporting platinum or the like, many pyrolysis gases can be oxidized and removed at a low temperature, and when the amount of gas generated exceeds the catalyst purification capacity, the electric heater 80b is heated to 800 degrees. Can be completely burned in the gas combustion chamber 82 heated in step, and the temperature rise of the electric heater 80b can be 500 to 700 ° C. or more at the outlet of the oxidation catalyst layer 76, and the reaction heat is also easily added. The temperature can be raised to 800 ° C. and the temperature can be maintained.
(Hydrogen chloride absorption tower)

  The hydrogen chloride absorption tower 4 is installed in the last stage and is a device that neutralizes only hydrogen chloride in the gas sucked from the catalyst gas purification device 3 and renders it harmless. For example, a sodium hydroxide solution tank 86 is provided as a neutralizing agent, the liquid is circulated by a pump 88, sprayed by a shower 90 from above, hydrogen chloride is sent from below and mixed by a demister unit 92, and hydrogen chloride is adsorbed to the liquid. After treatment and neutralization, the remaining purified gas is discharged to the atmosphere.

The chemical reaction formula is as follows.
HCl + NaOH → NaCl + H ₂ O
Since the neutralized liquid after the treatment becomes sodium chloride, it can be reused as an industrial salt. Further, when hydrogen chloride is adsorbed on water without being neutralized, it becomes hydrochloric acid water, which can be effectively used.

It is a covered wire recycling system schematic diagram showing one example of the present invention. It is the schematic which shows the structure of the covered electric wire supply apparatus of this invention, and is a plane schematic diagram which shows the raising / lowering mechanism which attached the bucket main body to the chain. It is the schematic which shows a part of structure of the covered electric wire supply apparatus of this invention, and is a schematic side view which shows the raising / lowering mechanism which attached the bucket main body to the chain. It is the side schematic diagram which shows the raising / lowering mechanism of the state which the bucket which put the covered electric wire rose before the upper limit. It is the side schematic diagram of the raising / lowering mechanism which shows the state by which a covered electric wire is thrown into a continuous carbonization apparatus from a bucket. It is the schematic which shows the covered electric wire supply chamber of the continuous carbonization apparatus of this invention, and is the schematic side view which shows the state which accommodated the covered electric wire in the covered electric wire supply chamber. It is the plane schematic which shows the state which accommodated the covered electric wire in the covered electric wire supply chamber. It is a side schematic diagram of a covered wire supply chamber showing a state where a covered wire falls from a covered wire supply chamber into a thermal decomposition chamber. It is the schematic which shows the thermal decomposition chamber of the continuous carbonization apparatus of this invention, and is a side schematic diagram which shows the state which the covered electric wire was mounted on the grate which comprises the fire bed part of a thermal decomposition chamber. It is the side surface schematic diagram which shows the state which the covered electric wire was mounted on the grate. It is the plane schematic which shows the state which the covered electric wire was mounted on the grate. It is the schematic which shows the state which a covered electric wire is crushed by rotation of a grate, and falls. It is the side surface schematic of the cooling chamber of this invention, and is the side schematic diagram which shows the state which the covered electric wire after thermal decomposition falls in a cooling chamber. It is the side schematic diagram which shows the state from which the cooled electric wire and the coating | covering material after a thermal decomposition are discharged | emitted from a cooling chamber. It is the schematic which shows the gas purification part of the covered electric wire recycling system of this invention.

DESCRIPTION OF SYMBOLS 1 Coated wire recycling system 2 Continuous carbonization device 3 Catalytic gas purification device 4 Hydrogen chloride absorption tower 5 Coated wire supply device 11 Bucket 14 Coated wire 17 Jig 20 Coated wire supply chamber 30 Pyrolysis chamber 35 Grate 36 Electric heater 38 Eccentric plate 40 Microwave irradiation port 50 Cooling chamber 72 Fan 76 Oxidation catalyst layer 78 Oxidation catalyst 82 Gas combustion chamber 86 Sodium hydroxide solution tank 92 Demister section

Claims (18)

A continuous carbonization device that separates and recovers the coating material and the copper wire by pyrolyzing the coated wire in an atmosphere of no or low oxygen using an electric heater and heating means by microwave irradiation, and generated in this continuous carbonization device 1. A coated wire recycling system comprising a catalytic gas purification device for purifying cracked gas and a hydrogen chloride absorption tower for removing hydrogen chloride generated by thermal decomposition of the coated wire. The continuous carbonization apparatus cools the coated electric wire supply chamber for storing the coated electric wire, the coated electric wire supplied from the coated electric wire supply chamber by pyrolyzing by heating, and carbonizing the coated electric wire after the pyrolysis. The system for recycling a covered electric wire according to claim 1, comprising a cooling chamber. The continuous carbonization apparatus has a pyrolysis chamber of one stage or two or more stages of upper and lower sides, and the pyrolysis chamber includes a grate that directly receives a covered electric wire and thermally decomposes. The recycling system of the covered electric wire described in any one of 1-2. The pyrolysis chamber of the continuous carbonization apparatus is arranged such that a plurality of electric heaters are arranged on the side of the grate so as to surround the outside of the covered wire, and heat is applied to the covered wire from the entire side of the grate. The system for recycling a covered electric wire according to any one of claims 1 to 3, wherein: The recycling of the covered electric wire according to any one of claims 1 to 4, wherein the pyrolysis chamber of the continuous carbonization apparatus is provided with a microwave irradiation port using microwave irradiation as a heating means. system. The pyrolysis chamber of the continuous carbonization apparatus is provided with a superheated steam spray port in addition to heating by electric heater and microwave irradiation, and the covered electric wire is heated by the superheated steam. The recycling system of the covered electric wire described in 1. The pyrolysis chamber of the continuous carbonization apparatus is a pair of eccentric plates that constitute a grate that directly receives a covered electric wire and thermally decomposes, and is configured so that it can be rotated simultaneously with the rotation of two axes. The system for recycling a covered electric wire according to claim 1, wherein the system is a recycling system for covered electric wires. The eccentric plate of the pyrolysis chamber is symmetric, and the thermal separation at the time of stopping is in the state where the distance between the left and right is the narrowest. When the thermal decomposition of the electric wire is completed, each eccentric plate is rotated once inward, and the portion of the eccentric plate in direct contact with the covered electric wire is gradually widened and rotated 180 degrees. The coated electric wire recycling system according to any one of claims 1 to 7, wherein the coated electric wire is configured to be widest at the time when the coated electric wire is dropped and fall downward. In the upper and lower two-stage or more pyrolysis chambers, when the eccentric plate of the lower pyrolysis chamber rotates and returns to a fixed position and stops, the eccentric plate of the upper pyrolysis chamber rotates and pushes the covered wire downward, Fall on the eccentric plate of the thermal decomposition chamber of the upper pyrolysis chamber, rotate the eccentric plate of the upper pyrolysis chamber, return to a fixed position and stop, the covered electric wire before decomposition from the coated electric wire supply chamber onto the eccentric plate of the upper pyrolysis chamber It falls and is supplied, The recycling system of the covered electric wire described in any one of Claims 1-8 characterized by the above-mentioned. The covered electric wire supply chamber which receives a covered electric wire is supplied using the covered electric wire supply apparatus provided with the bucket which accommodates a covered electric wire, The covered electric wire described in any one of Claims 2-9 characterized by the above-mentioned. Recycling system. The covered wire supply chamber for receiving the covered wire is provided at the uppermost part of the pyrolysis chamber, temporarily holds the covered wire supplied from the covered wire supply device, and receives the covered wire from the covered wire supply device. The covering electric wire delivery port which delivers a covered electric wire in a thermal decomposition chamber is provided, Each opening is comprised so that it can seal with a door, It described in any one of Claims 2-10 characterized by the above-mentioned. Coated wire recycling system. The covered wire supply chamber that receives the covered wire opens the outside air door of the covered wire supply chamber while the bucket of the covered wire supply device is rising, accepts the covered wire from the raised bucket, The system for recycling a covered electric wire according to any one of claims 2 to 11, wherein an outside air door of the electric wire supply chamber is sealed. The covered electric wire supply chamber for receiving the covered electric wire is configured so that both the pyrolysis chamber side and the covered electric wire receiving side door are sealed with respect to the outside air side and the pyrolysis chamber side while the covered electric wire is being stored. 3. When the door is opened, the door inside the pyrolysis chamber is closed, so that the inflow of outside air into the pyrolysis chamber and the gas leakage from the inside do not occur. The recycling system of the covered electric wire described in any one of -12. The covered electric wire supply chamber that receives the covered electric wire has a cradle for placing the covered electric wire, and when passing the covered electric wire into the pyrolysis chamber, when the door is opened, it rotates from the horizontal state to the vertical state as the door is opened. When the covered wire drops from the cradle to the grate in the pyrolysis chamber, and the covered wire is dropped, when the door is closed, the cradle also returns to its original state, and preparation for receiving the covered wire from the next covered wire feeder is completed. It is comprised so that it may complete, The recycling system of the covered electric wire described in any one of Claims 2-13 characterized by the above-mentioned. The cooling chamber that cools the coated wire after pyrolysis has a coated wire receiving port from the pyrolysis chamber and an outlet for taking the coated wire to the outside, and each port is sealed by a door and can be opened and closed. The system for recycling a covered electric wire according to claim 2, wherein: The cooling chamber that cools the coated wire after pyrolysis has a cradle on which the coated wire after pyrolysis is placed, and the coated wire is placed directly on the cradle by opening the door of the cooling chamber receiving port, and the coated wire is being cooled. Closed the doors of both doors and sealed the room against the outside air side and the pyrolysis chamber side.When the door was opened at the time of removal, the door inside the pyrolysis chamber was closed, and the pyrolysis chamber was closed. It is configured so that the outside air does not flow into the chamber and the gas leaks from the inside, and the door on the outside air side is sealed when the covered electric wire is transferred to the cooling chamber. The system for recycling a covered electric wire according to any one of claims 2 to 15, wherein the recycle system is configured so as not to occur. The catalytic gas purification device that purifies the cracked gas generated in the continuous carbonization device includes an oxidation catalyst layer that oxidizes a gas other than hydrogen chloride among the cracked gas generated in the continuous carbonization device, and an unreacted carbon monoxide in the catalyst layer. The covered wire recycling system according to any one of claims 1 to 16, wherein the system is composed of a gas combustion chamber for flame-combusting hydrocarbons and hydrocarbons. The hydrogen chloride absorption tower that removes hydrogen chloride generated by thermal decomposition of the covered wire consists of a neutralizer tank of sodium hydroxide solution that neutralizes and detoxifies hydrogen chloride out of the gas sucked from the catalyst gas purification device. A pump for circulating the neutralizing agent solution in the neutralizing agent tank, a shower for spraying the neutralizing agent solution circulated by the pump, a neutralizing agent solution sprayed from the shower, and hydrogen chloride fed from below. The system for recycling a covered electric wire according to any one of claims 1 to 17, comprising a demister section to be mixed.