JP2002060757A - Regeneration system for waste plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a regeneration system for waste plastics capable of recycling produced oil from waste plastics in a useful manner. SOLUTION: The regeneration system 100 for waste plastics has a decomposition oil-producing apparatus 20 which decomposes waste plastics by heat to produce decomposition oil. The decomposition oil is mixed with a crude oil in a mixing apparatus 50. The mixed decomposition oil and crude oil are purified in a petroleum purifying apparatus 60.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste plastic recycling system for thermally decomposing and recycling waste plastic.

[0002]

2. Description of the Related Art As a conventional waste plastic recycling system, there is known a processing apparatus for extracting waste oil by heat-treating waste plastic.

[0003] Such a treatment apparatus includes, for example, a desalination treatment apparatus that heat-treats a chlorine-containing plastic to separate hydrogen chloride and a molten plastic, and water is added to hydrogen chloride separated by the desalination treatment apparatus. A hydrochloric acid recovery device that recovers as hydrochloric acid, a residue discharge treatment device that reheats the molten plastic separated by the desalination treatment device to generate pyrolysis gas, and discharges dechlorinated residues, and a residue discharge treatment device And a produced oil treatment device for cooling the pyrolysis gas generated in the above and extracting the oil as oil.

[0004]

The final reclaimed product in a conventional waste plastic reclaim system is a solid fuel formed from the residue and product oil. Unfortunately, these reclaimed products have not been effectively used because of the low market needs. In particular, generated oil is often burned immediately after generation, resulting in large energy loss.

[0005] The present invention has been made in view of such a point, the oil produced from waste plastics,
It is an object of the present invention to provide a waste plastic recycling system that can be remarkably usefully reused.

[0006]

SUMMARY OF THE INVENTION The present invention provides a cracked oil generator for cracking waste plastic to generate cracked oil, a mixing device for mixing the cracked oil with crude oil, a mixed cracked oil and crude oil. And a petroleum refining apparatus for refining waste plastics.

According to the present invention, cracked oil obtained from waste plastic is sent to a petroleum refining unit and re-refined, and can be reused as various refined petroleum products such as naphtha.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a waste plastic recycling system according to a first embodiment of the present invention.
As shown in FIG. 1, the waste plastic recycling system according to the first embodiment of the present invention includes a first pretreatment device 10 for crushing and sorting used waste plastic, and a heat treatment for crushed and sorted waste plastic. The apparatus includes a cracked oil generating device 20 that cracks to generate cracked oil, a mixing device 50 that mixes the generated cracked oil with crude oil, and a petroleum refining device 60 that refines the mixed cracked oil and crude oil. .

The first pretreatment device 10 includes a crusher 11 as a crushing unit for crushing the supplied waste plastic, a dryer 12 for drying the crushed waste plastic, and agitating the dried waste plastic. Further, a dryer cyclone 13 for drying, a wind separator 14 for air-selecting the dried waste plastic, a magnetic separator 15 for magnetically selecting the waste plastic selected for wind, and a waste plastic that has been subjected to the wind selection and / or the magnetic selection are manufactured. A granulator 16 for granulating and a granule silo 17 for storing granulated waste plastic are connected substantially in series via a transport mechanism such as a transport belt.

[0011] The cracked oil generating device 20 includes a first pretreatment device 1.
A supply hopper 21 to which the granulated plastic pretreated at 0 is supplied, a dechlorination unit (dechlorination unit) 22 for separating the granulated plastic into hydrogen chloride and molten plastic by heating and stirring, and desalination. A melting tank 23 that melts the melted plastic, a pyrolysis device 24 (pyrolysis unit) that pyrolyzes the molten plastic to generate oil gas,
An oil-gas liquefaction device 34 (oil-gas liquefaction unit) that cools the generated oil gas to make it a cracked oil is connected by a pipe or the like.

The pyrolysis device 24 has a residue discharge conveyor (residue discharge mechanism) for discharging the residue of the pyrolysis device 24.
25 are connected.

[0013] A cracked oil tank 35 for storing cracked oil is connected to the oil-gas liquefaction apparatus 34.
5 is provided with a cracked oil discharge mechanism 36 for appropriately discharging the cracked oil. The cracked oil carry-out mechanism 36 transports the cracked oil to a cracked oil receiving tank 51 of the mixing device 50 described below. The cracked oil carrying-out mechanism 36 can be constituted by, for example, a transporting mechanism of a storage container such as a tank lorry. The transfer need not be automatic.

A desalination gas combustion furnace 26 is connected to the melting tank 23 as a chlorination unit for treating the hydrogen chloride gas separated in the dechlorination unit 22. The desalination gas combustion furnace 26 is connected to a hydrogen chloride absorption tower 27, and the combustion gas is separated into a hydrochloric acid component and other components in the hydrogen chloride absorption tower 27. The separated hydrochloric acid component is
The other components collected in the hydrochloric acid tank 28 are separated into a liquid component and a gas component via the elimination device 29. The liquid component is discharged through a reaction tank 30, a coagulation sedimentation tank 31, and a treated water storage tank 32, and the gas component is discharged to the atmosphere via an exhaust gas combustion device 33.

The details of the oil-gas liquefaction apparatus 34 are shown in FIG.
This will be described with reference to FIG. As shown in FIG. 2, the oil gas liquefaction device 34 converts the oil gas generated in the thermal decomposition device 24 into decomposed oil via an oil gas ejector 34a as decomposed oil.
b. Cracked oil drum 34b
Is connected to the above-described cracked oil tank 35 via a cracked oil pump 34c, a cracked oil filter 34d, and a cracked oil cooler 34e.

A part of the cracked oil that has passed through the cracked oil filter 34d is cooled by an oil-gas ejector cooler and then circulated to the oil-gas ejector 34a.

Further, the gas component of the cracked oil drum 34b is sent to a feed gas scrubber 42. A circulating water mechanism including a circulating water separator 43, a circulating water pump 44 and a circulating water cooler 45 is incorporated in the feed gas scrubber 42. Circulating water separator 4
Numeral 3 extracts a waste water component and a fuel component from the circulating water and sends them to a waste water treatment device and a fuel tank 46, respectively. The fuel tank 46 is further adapted to receive a fuel component directly from the feed gas scrubber 42. The fuel tank 46 is connected to a waste gas processing device for processing gas components in the tank.

The mixing device 50 has a cracked oil receiving tank 51 for receiving and temporarily storing cracked oil, and a mixing body 53 for mixing cracked oil and crude oil. The transport of the cracked oil from the cracked oil receiving tank 51 to the mixing main body 53 is performed by the second transport device 52.

In the case of the present embodiment, the petroleum refining apparatus 60 produces raw materials for plastics, specifically, naphtha. The petroleum refining device 60 is designed to produce not only naphtha but also other petroleum products such as petroleum fuels and various raw materials.

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

The waste plastic is first crushed by a crusher 11, dried by a dryer 12, and further dried while being stirred by a cyclone 13. The dried waste plastic is sorted by a wind separator 14 and a magnetic separator 15, and only a suitable waste plastic is granulated by a granulator 16. The granulated waste plastic is stored in a granulated silo 17 and supplied to the supply hopper 2 at an appropriate timing.
Sent to 1.

The supply hopper 21 sends the granulated plastic to the dechlorinator 22 stably. The dechlorinator 22 separates the granulated plastic into hydrogen chloride and desalted plastic by a heating and stirring process. The desalted plastic is melted in a melting tank 23, and the melted plastic is thermally decomposed in a pyrolysis device 24 to generate oil gas. The pyrolysis device 24 generates a residue together with the oil gas, and the residue is discharged by a residue discharge conveyor 25.

On the other hand, the hydrogen chloride gas generated from the melting tank 23 is burned in a desalination gas combustion furnace 26. The combustion gas is separated into a hydrochloric acid component and other components in a hydrogen chloride absorption tower 27, and the separated hydrochloric acid component is collected in a hydrochloric acid tank 28, and the other components are further separated into a liquid component and a gas component via an eliminator 29. Is separated into The liquid component is discharged through a reaction tank 30, a coagulation sedimentation tank 31, and a treated water storage tank 32, and the gas component is discharged to the atmosphere via an exhaust gas combustion device 33.

The oil gas generated in the thermal cracking device 24 is cooled in the oil-gas liquefaction device 34 to become cracked oil.

More specifically, the oil gas generated in the thermal cracking device 24 is stored in the cracked oil drum 34b as cracked oil via the oil gas ejector 34a. The cracked oil stored in the cracked oil drum 34b is
c, through the cracked oil filter 34d and the cracked oil cooler,
It is sent to the cracked oil tank 35.

In the present embodiment, the cracked oil filter 34d
Of the cracked oil that has passed through the oil-gas ejector cooler 4
After being cooled by 1, it is circulated to the oil gas ejector 34 a.

The gas component of the cracked oil drum 34b is sent to a feed gas scrubber 42. Circulating water separator 43 of circulating water mechanism incorporated in feed gas scrubber 42
Extracts the wastewater component and the fuel component from the circulating water and sends them to the wastewater treatment device and the fuel tank 46, respectively.
The fuel component is directly sent from the feed gas scrubber to the fuel tank 46, and the gas component in the tank is sent to the waste gas treatment device.

The cracked oil liquefied by the oil gas liquefaction unit 34 is conveyed to a cracked oil receiving tank 51 via a cracked oil tank 35 and a cracked oil discharge mechanism 36. Then the cracked oil is
The mixture is sent to the mixing main body 53 by the second transfer device 52 and mixed with the crude oil.

The petroleum refining unit 60 produces raw materials for plastics such as naphtha, petroleum fuels, various raw materials, and the like from cracked oil mixed with crude oil.

As described above, according to the present embodiment, the cracked oil obtained from the waste plastic is sent to the petroleum refining device 60 and re-refined, and is reused as various petroleum refined products such as naphtha. Therefore, the energy loss of waste plastic regeneration can be reduced.

As the oil refinery 60, an existing equipment of an oil refinery can be used. In this case, the operation efficiency of the system is remarkably excellent.

Further, before the first pre-processing device 10 of the above embodiment, a second pre-processing device 70 as shown in FIG.
May be provided. The second pretreatment device 70 in FIG. 3 includes a sorting device 71 and a volume reducing device 72.

[0033] The sorting device 71 sorts waste from each household, and sorts oilable plastics and non-oilable plastics, bottles, cans, and the like. In addition, the volume reducing device 72 reduces the volume to a size suitable for transportation by crushing and granulating the oily plastic, or by compacting the oily plastic into a bale. It is becoming.

When such a second pretreatment device is used together,
For waste brought in from local governments and contractors,
It is possible to respond widely.

[0035]

As described above, according to the present invention, cracked oil obtained from waste plastic is sent to a petroleum refining unit and re-refined, and is reused as various petroleum refined products such as naphtha. Therefore, the energy loss of waste plastic regeneration can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a waste plastic recycling system according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing details of the oil-gas liquefaction apparatus of FIG. 1;

FIG. 3 is a schematic configuration diagram showing a second pretreatment device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 first pretreatment device 11 crusher 12 dryer 13 dryer cyclone 14 air separator 15 magnetic separator 16 granulator 17 granulated silo 20 cracked oil generator 21 supply hopper 22 dechlorinator 23 melting tank 24 pyrolysis Apparatus 25 Residue carry-out conveyor 26 Desalinated gas combustion furnace 27 Hydrogen chloride absorption tower 28 Hydrochloric acid tank 29 Eliminator 30 Reaction tank 31 Coagulation sedimentation tank 32 Treated water storage tank 33 Exhaust gas combustion device 34 Oil gasification device 34a Oil gas ejector 34b Decomposition Oil drum 34c Cracked oil pump 34d Cracked oil filter 34e Cracked oil cooler 35 Cracked oil tank 36 Unloading device 50 Mixing device 51 Cracked oil receiving tank 52 Cracked oil transport device 53 Mixing main unit 60 Oil refining device 70 Second pretreatment device 71 Sorting device 72 Volume reduction device

Claims (7)

[Claims] 1. A cracked oil generator for cracking waste plastic to generate cracked oil, a mixing device for mixing the cracked oil with crude oil, a petroleum refining device for refining cracked cracked oil and crude oil,
A recycling system for waste plastic, comprising: 2. The waste plastic recycling system according to claim 1, wherein the petroleum refining device is adapted to produce a raw material for plastic. 3. A decomposed oil generating device includes: a dechlorination section for dechlorinating supplied waste plastic; a melting tank for melting desalted waste plastic; and an oil gas by thermally decomposing the molten waste plastic. And a residue discharging mechanism for discharging a residue of the thermal cracking unit, wherein the oil gas liquefaction unit cools the generated oil gas to crack oil, and discharges a residue of the thermal cracking unit. 2. A waste plastic recycling system according to claim 1. 4. The cracked oil producing device according to claim 3, further comprising a cracked oil tank for storing the cracked oil, and a cracked oil discharge mechanism for discharging the cracked oil. Reproduction system. 5. The waste plastic recycling system according to claim 3, wherein the cracked oil generating device further comprises a sorting unit for sorting the supplied waste plastic. 6. The waste plastic recycling system according to claim 3, wherein the cracked oil generating device further has a crushing section for crushing the supplied waste plastic. 7. The waste plastic recycling system according to claim 3, wherein the cracked oil generating device further comprises a chlorination unit for processing hydrogen chloride gas generated from the melting tank. .