JPH09310076A - Rubber and plastic waste treatment equipment - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a device capable of efficiently discharging the residue accumulated at the bottom of a thermal decomposition tank for thermally decomposing rubber / plastic waste. SOLUTION: Spiral blades are meshed with each other and rotated by rotation driving means such as a motor 4 at the bottom of a thermal decomposition tank 1 for thermally decomposing rubber / plastic waste in the presence of a catalyst. Two screws 5a, 5
The discharge pipe 6 containing b is connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for treating rubber / plastic waste produced during or after the production of electric wires / cables.

[0002]

2. Description of the Related Art Conventionally, rubber and plastic waste generated during the production and use of electric wires and cables has been mainly treated by landfill, but in recent years, plastic waste has been thermally decomposed into oil. A method has been developed to reuse the resources and there is no risk of environmental pollution.

[0003] As a method for converting plastic waste into oil, (a) a batch charging method in which plastic waste and a catalyst are charged into a preheated pyrolysis tank to thermally decompose and convert to oil;
(B) A method in which pre-ground plastic waste is mixed with a catalyst by a transfer means such as a screw feeder and supplied to a pyrolysis tank, where it is heated at a high temperature to be thermally decomposed and turned into oil. The plastic waste heat-treated at a temperature of about 360 ° C together with the catalyst in the tank is transferred to a pyrolysis tank using a screw feeder or the like, where it is heated at a high temperature (400 to 470 ° C) in the presence of the catalyst. Is decomposed, and the gaseous pyrolyzate generated by this pyrolysis is
(JP-A-59-174690) is proposed in which the catalyst is reformed (low molecular weight, or cyclized or aromatized) by passing it through a tank filled with a heated catalyst and recovered as a hydrocarbon oil. Have been.

By the way, in such a treatment method, various residues generated when the plastic waste is thermally decomposed are accumulated at the bottom of the thermal decomposition tank, so that a discharge pipe having an opening / closing valve is attached to the bottom. Alternatively, a screw feeder is provided to appropriately discharge the accumulated residue to the outside.

[0005]

However, in such a conventional discharging means, since the viscosity of the residue is high and the residue easily adheres to and stays on the inner wall surface of the discharge pipe, the discharging efficiency is poor, and the accumulated residue is retained. Cleaning work to remove from the discharge pipe and screw feeder must be done frequently,
There is a problem that the treatment efficiency of waste is greatly reduced.

The present invention has been made to solve such a problem, and when the rubber / plastic waste is thermally decomposed, the residue accumulated at the bottom of the thermal decomposition tank can be efficiently discharged, and It is an object of the present invention to provide a rubber / plastic waste treatment device having excellent treatment efficiency, which does not require frequent cleaning of the discharge device.

[0007]

The apparatus for treating rubber / plastic waste according to the present invention comprises a residue discharging device provided below a thermal decomposition tank for thermally decomposing rubber / plastic waste in the presence of a catalyst. In the rubber / plastic waste processing apparatus, the residue discharging apparatus is configured so that the spiral driving blades connected to the bottom portion of the thermal decomposition tank are engaged with each other to rotate.
The present invention is characterized in that it is provided with a discharge pipe having a built-in screw.

According to the rubber / plastic waste treatment apparatus of the present invention having the above-described structure, since the two screws are arranged, the residue conveying performance is excellent, and moreover, in each groove. Since the contained residue is scraped out by the other screw, the residue can be efficiently discharged with almost no cleaning work inside the discharge pipe. Therefore, the operating efficiency of the processing device can be improved.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing a main part of an example of a rubber / plastic waste processing apparatus of the present invention. In FIG. 1, reference numeral 1 denotes a thermal decomposition tank for thermally decomposing plastic waste in the presence of a catalyst. Below the thermal decomposition tank 1, a residue discharge device 3 for discharging a residue 2 is provided.
Are arranged. That is, a discharge port 1a is opened at the bottom of the thermal decomposition tank 1, and the discharge port 1a has two screws that are rotationally driven by the motors 4 and 4, that is, a discharge having a built-in screw A5a and screw B5b. The pipe 6 is connected almost vertically. The screw A5a and the screw B5b are shown in FIG.
As shown in the enlarged view of FIG. 3, the two screws are configured to rotate in a state of being meshed with each other, that is, in a state in which the other flight is inserted between one flight, and the upper end of one screw A5a has a thermal decomposition tank A scraper 7 for scraping out the bottom of the screw 1 is provided integrally with the screw A5a.

In the apparatus thus constructed, the screw A5a and the screw B5b are normally rotated at the same number of revolutions, whereby the residue 2 accumulated at the bottom of the thermal decomposition tank 1 rotates with the screw A5a.
Are collected by the screw A5a and the screw B5b in the discharge pipe 6 and smoothly discharged to the outside. At this time, the screw A5a and the screw B5b are rotating in a state of meshing with each other, and the residue 2 that has entered each groove is constantly scraped out by the other screw blade, so that it does not stay in the groove and is almost completely Can be discharged to the outside.

When the discharge of the residue 2 is desired to be stopped, the screw A5a and the screw B5b may be rotated in reverse at the same number of revolutions.
Inward discharge can be easily stopped. At this time, the scraper 7 functions as a stirring device in the thermal decomposition tank 1, so that the thermal decomposition efficiency in the thermal decomposition tank 1 can be improved.

That is, in the above apparatus, the screw A5a and the screw B5b are appropriately rotated in the normal rotation or the reverse rotation so that the residue 2 is discharged from the bottom of the thermal decomposition tank 1 and stopped and stopped in the thermal decomposition tank 1. It is possible to easily control the stirring of and to discharge the residue 2 quickly to the outside without accumulating in the discharge pipe 6, so that a highly efficient rubber. It is possible to process plastic waste.

In the example shown in FIG. 1, the screw A5 is used.
This is an example of the case where a and the screw B5b have the same forward rotation direction. However, as shown in FIG. 3, those having different forward rotation directions may be used, and the discharge efficiency is further improved because the conveyance ability is superior. You can Note that, in FIG. 3, parts common to FIG. 2 are denoted by the same reference numerals. Further, although not shown, a horizontal transfer means such as a screw feeder may be further arranged below the exhaust pipe 6 if necessary. It is desirable to use a screw feeder having a structure in which the screws of the book are engaged and rotated.

Next, an example in which the present invention is applied to a continuous oil treatment apparatus for rubber / plastic waste will be described.

As shown in FIG. 4, this apparatus is equipped with a rubber / plastic waste supply pipe 13 and a rubber / plastic waste at a rear end and an intermediate portion of a cylinder 12 of an extruder 11 such as a twin-screw extruder. The catalyst supply pipe 14 for promoting decomposition is connected, and the extrusion port 11a of the extruder 11 is connected to the thermal decomposition tank 16 via the material guide pipe 15, while
An exhaust port 16a is opened above the thermal decomposition tank 16, and the exhaust port 16a is connected to an oil recovery device 18 via a catalyst tank 17. And in this device,
Below the thermal decomposition tank 16, there is provided a residue discharge device 21 for appropriately discharging the residue generated in the thermal decomposition tank 16 to the outside by rotating the two screws 20a and 20b by the motor 19 as described above. Has been done.

In the apparatus thus constructed, the extruder 1
The rubber / plastic waste that is heated and kneaded in 1 to be in a molten or semi-molten state is used in the cylinder 12 of the extruder 11.
The catalyst is uniformly added and mixed in the middle part of the thermal decomposition tank 1 in a state of being preheated to a temperature close to the decomposition start temperature.
6 and is pyrolyzed. The gaseous decomposition product generated by this thermal decomposition is discharged from the exhaust port 16a in the upper part of the thermal decomposition tank 16 and, while passing through the catalyst tank 17, undergoes secondary thermal decomposition to be reformed, and the oil recovery device. Recovered at 35. On the other hand, since the residue generated in the thermal decomposition tank 16 moves to the bottom portion, it is appropriately discharged to the outside by the residue discharging device 21. As described above, the residue discharging device 21 has excellent discharging performance, and thus the residue is quickly discharged to the outside without staying in the residue discharging device 21. Therefore,
It is not necessary to interrupt the operation of the entire apparatus for discharging the residue, and highly efficient processing can be performed. FIG.
In the above, Ha and Hb are heaters for heating the thermal decomposition tank 16 and the catalyst tank 17, respectively.

[0017]

As described above, according to the apparatus of the present invention, the spiral drive blades are retained at the bottom of the pyrolysis tank by the two screws that rotate by meshing with each other. Since the configuration is such that the residue is discharged, the residue can be discharged to the outside efficiently and appropriately, and it is not necessary to perform frequent cleaning work of the discharging device.
Therefore, the processing efficiency of rubber / plastic waste can be improved and the reliability can be improved.

[Brief description of drawings]

FIG. 1 is a view schematically showing a main part of an example of a rubber / plastic waste processing apparatus of the present invention.

FIG. 2 is a diagram showing a further enlarged main part of the apparatus shown in FIG.

FIG. 3 is a diagram schematically showing a main part of another example of the rubber / plastic waste processing apparatus of the present invention.

FIG. 4 is a configuration diagram schematically showing an example of a rubber / plastic waste continuous oil conversion treatment apparatus to which the present invention is applied.

[Explanation of symbols]

 1, 16 ... Pyrolysis tank 2 ... Residue 3, 21 ...... Residue discharge device 4, 19 ...... Motor 5a ...... Screw A 5b ...... Screw B 6 ...... Discharge pipe 20a, 20b ......... Screw

 ─────────────────────────────────────────────────── ─── Continued Front Page (71) Applicant 000005290 Furukawa Electric Co., Ltd. 2-6-1, Marunouchi, Chiyoda-ku, Tokyo (71) Applicant 000002130 Sumitomo Electric Industries, Ltd. 4-5 Kitahama, Chuo-ku, Osaka-shi, Osaka No. 33 (71) Applicant 000005186 Fujikura Co., Ltd. 1-5-1, Kiba, Koto-ku, Tokyo (71) Applicant 000003263 Mitsubishi Cable Industries, Ltd. 8 Nishinocho, Higashimukaijima, Amagasaki City, Hyogo Prefecture (72) Inventor Old age Tetsuro 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Showa Electric Cable Denki Co., Ltd. (72) Inventor, Politics 2-1-1, Odaei Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture (72) ) Inventor Susumu Hirai 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture, Showa Cable Denki Co., Ltd. (72) Inventor Haruhiko Matsuo 2-1-1, Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Within Showa Cable Denki Co., Ltd. (72) Inami Masami 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Hitachi Cable Co., Ltd. (72) ) Inventor Toshio Shiina 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Hitachi Power Cable Co., Ltd. Power Systems Laboratory (72) Inventor Etsuo Fukuchi 5-1-1 Hidaka Town, Hitachi City, Ibaraki Hitachi Cable Co., Ltd. Power Systems Laboratory (72) Inventor Hiromi Tsuda 1-4-4 Shintoda, Hamamatsu-shi, Shizuoka Incorporated Electric Wire Technology Center (72) Inventor Ryoichi Ito 1-4-4 Shintoda, Hamamatsu-shi, Shizuoka Corporate Electric Cable Technical Center

Claims (2)

[Claims] 1. A rubber / plastic waste treatment apparatus comprising a residue discharging device provided below a thermal decomposition tank for thermally decomposing rubber / plastic waste in the presence of a catalyst, wherein the residue discharging device is thermally decomposed. It is characterized by comprising a discharge pipe connected to the bottom of the tank and containing two screws configured so that the respective spiral blades are engaged with each other and rotated by the rotation driving means. Equipment for rubber / plastic waste disposal. 2. The apparatus for treating rubber / plastic waste according to claim 1, further comprising an extruder that heat-kneads the rubber / plastic waste and the catalyst and supplies them to the thermal decomposition tank in a molten or semi-molten state. Rubber and plastic waste treatment equipment characterized by