KR100884720B1 - Apparatus for restoring waste plastic to oil - Google Patents

Abstract

The present invention relates to an oil reduction apparatus for waste plastics, and more particularly, to discharge plastic gas generated by heating waste plastics injected in order to reduce waste oil to a liquid raw material by applying heat to the waste plastics. At least one heating tank for agitating the molten plastic by vibration generated by boiling; A wax separation tank connected to the heating tank to delay the flow of the discharged plastic gas and returning the generated wax to the heating tank and continuously discharging the remaining plastic gas; A reduction assembly for collecting and liquefying the plastic gas discharged from the wax separation tank to oil, and stabilizing and collecting the plastic gas discharged from the heating tank to liquefy and reduce the plastic gas to oil; And collecting residual plastic gas discharged from the reduction assembly in the water contained therein to prevent backflow of the residual plastic gas to the wax separation tank, and preventing backflow of the treated after-treatment gas or returning to the heating source of the heating tank. With the technical gist of the present invention, the present invention relates to an oil reduction device for waste plastics, which is capable of safely obtaining high purity raw material oil and is environmentally friendly.

Emulsification reduction, heating tank, wax separation tank, reduction assembly, countercurrent prevention tank

Description

Apparatus for restoring waste plastic to oil}

Figure 1 shows the overall configuration of the oil reduction device of the waste plastic according to the present invention

Conceptual diagram shown

* Description of the symbols for the main parts of the drawings *

100 heating tank 200 wax separation tank

300 ... Reduction assembly 400 ... Reflow prevention tank

The present invention relates to an oil reducing apparatus for waste plastics, and liquefied and vaporized the pulverized waste plastics to separate waxes and reduce the remaining plastic gas to oils, thereby safely obtaining high purity raw material oils. The present invention relates to an oil reduction device for waste plastics, which is environmentally friendly.

In recent years, due to the rapid increase in the production of plastics due to the development of petrochemicals, the treatment of the wastes is a social problem, and as described above, various devices are known regarding a device for heating waste plastics and reducing them to oils as raw materials. It is.

In view of the above, Korean Patent Application No. 10-1993-21806, "Method for recovering low boiling point hydrocarbon oil by pyrolysis treatment of waste synthetic resin" (hereinafter referred to as "prior art 1"), and Patent Registration No. 10-345760 Emulsification reduction apparatus of waste plastic "(hereinafter" prior art 2 ") and the patent application" 10-2006-7014064 "waste plastic emulsification reduction apparatus" (hereinafter "prior art 3").

The prior art 1 is a method of condensing the synthetic resin into a molten bath by heating and condensing it into the liquid phase through the packed bed of the pyrolysis tank, the gas is discharged and the oil is recovered, the prior art 2 is heated while grinding the plastic through the hopper It discharges gas and recovers oil to the lower side of the hopper.

In addition, the prior art 3 is an inlet for injecting waste plastic, a pyrolysis tank for heating the waste plastic introduced by flowing a high frequency current, a supply unit for supplying the waste plastic injected into the inlet to the pyrolysis tank through a supply means, and the pyrolysis tank It is a structure provided with the emulsification process part which cools and emulsifies the decomposition gas produced | generated at

However, the prior art has to be provided with a separate stirrer for mixing and stirring the molten plastic by heating and heating at the same time using a grinding device including a spiral grinding blade, there is a problem that the initial load on the device itself there was.

In addition, the prior art is because the wax component is mixed in the gas generated by the input heating of the waste plastic, the wax is deposited in the pipe when used for a long time to inhibit the flow of gas and oil, and in the worst case may include the explosion risk of the device itself It can be.

In particular, the prior art 3 uses a high frequency method for heating the waste plastic, the tremendous amount of power is required to generate a high frequency for the high temperature to heat the waste plastic, even if the heating to industrial power, the entire apparatus and system The annual cost of the operation was enormous, resulting in very inefficient economic results.

The present invention has been made to solve the above problems, it is an object of the present invention to provide an oil-reducing device of waste plastic that is safe and can be obtained a high purity raw material oil.

In order to achieve the above object, the present invention, in the device for reducing the waste plastic by applying heat to the waste plastic material, plastic gas generated while liquefied and vaporized by heating the crushed waste plastic below the combustion temperature At least one heating tank for discharging and stirring the molten plastic by vibration generated by boiling of the liquefied molten plastic; A wax separation tank for delaying the flow of the plastic gas discharged by being connected to the heating tank and returning the generated wax to the heating tank and continuously discharging the remaining plastic gas; It is connected to each of the wax separation tank and the heating tank, respectively, and collect the plastic gas discharged from the wax separation tank to liquefy and reduce the plastic gas discharged from the heating tank, and stabilize and collect the plastic gas discharged from the heating tank to liquefy and reduce the oil Reducing assembly; And collecting residual plastic gas discharged from the reduction assembly in the water contained therein to prevent backflow of the residual plastic gas to the wax separation tank, and preventing backflow of the treated aftertreatment gas or returning it to a heating source of a heating tank. It characterized in that it comprises a.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention, Figure 1 is a conceptual diagram showing the overall configuration of the oil reduction device of the waste plastic according to the present invention.

As shown, it can be seen that the oil reducing device of the waste plastic according to the present invention is composed of a heating tank 100, a wax separation tank 200, a reduction assembly 300 and the backflow prevention tank 400.

In FIG. 1, reference numerals 22 and 24 denote coolant pumps and oil pumps forcibly flowing cooling water and oil from the reservoir tank WT and the oil tank OT, respectively, and T denotes the water supply from the oil tank OT. The TL collecting the reduced oil represents a tank lorry vehicle, respectively.

The heating tank 100 is at least one or more that is mounted in the heat insulating chamber (C) provided with a heating burner (B) on one side, waste plastic (ps), such as polypropylene, polystyrene, polyethylene, pulverized in the mill (b) It is to discharge the plastic gas generated by heating to below the combustion temperature, more specifically 380 to 450 ℃ liquefied and vaporized, and to agitate the molten plastic by the vibration generated by the boiling of the liquefied molten plastic. .

Here, the fuel of the heating burner (B) is supplied from the fuel tank (F), the oil in the fuel tank (F) may be used to recover the reduced oil from the reduction assembly 300 to be described later.

The heating tank 100 is provided with a plastic gas outlet 102, an overpressure plastic gas outlet 104, and a wax refund port 106 on the upper side, respectively, the outer cylinder 110 is provided with a closing door 112 that can be opened and closed. Inner cylinder 120 and the vibration mounting plate 130 is to be mounted.

The inner cylinder 120 is formed in the outer cylinder 110 and has a cylindrical shape connected to the plastic gas outlet 102, the overpressure plastic gas outlet 104, and the wax refund port 106, and the vibration mounting plate 130 is provided. ) Is a lower surface is mounted to the inner circumferential surface of the inner cylinder 120 and spaced apart by a predetermined interval, such as bolts are semi-cylindrical shape of both ends open.

Here, the waste plastic (ps) is mounted on the vibration mounting plate 130 and is changed to a liquid state to generate a plastic gas when heated, a portion of the plastic gas outlet 102 or the over-pressure plastic gas outlet ( Through 104).

In addition, the remainder of the plastic gas hits the inner circumferential surface of the inner cylinder 120 and flows down to the lower side of the inner cylinder 120 in a liquefied state or falls onto the vibration mounting plate 130, and the vibration mounting plate 130. ) And the space between the inner cylinder 120 to be boiled.

At this time, the boiling molten plastic imparts vibration to the vibration mounting plate 130 while hitting the inner circumferential surface of the inner cylinder 120 and the inner and outer surfaces of the vibration mounting plate 130, and needs to install a separate stirrer. Without the stirring of the molten plastic is made.

On the other hand, the wax separation tank 200 is connected to the heating tank 100, the pipe is delayed the flow of the discharged plastic gas and return the wax generated to the heating tank 100, and continues to flow the remaining plastic gas By performing the role of discharging to, it is composed of the first wax treatment tank 210 and the second wax treatment tank 220.

The first wax treatment tank 210 is interconnected to the heating tank 100 and the plastic gas discharge pipe 610 to collect the plastic gas generated in the heating tank 100 to delay the wax generated while delaying the flow. It returns to the wax return port 106 side of the heating tank 100, and serves to discharge the remaining plastic gas.

To this end, the first wax treatment tank 210 has a structure in which a plurality of wax drop plates 214 are inclined at a predetermined angle downward on the first body tube 212 installed at a predetermined height perpendicular to the ground.

The first body pipe 212 is a first gas inlet 211 and the wax return port 106 of the heating tank 100 are interconnected to the heating tank 100 and the plastic gas discharge pipe 610 on the lower side. A first gas outlet 215 having a first wax outlet 213 for returning wax to the upper side, and connected to the second wax treatment tank 220 and the plastic gas discharge pipe 610 at an upper side thereof, and to be described later. The wax receiving port 217 for accommodating the wax returned from the second wax processing tank 220 is provided.

In addition, the wax drop plate 214 has a plate shape that is spaced downwardly inclined downward at an angle with the inner surface of the first body tube 212 along the height direction of the first body tube 212 as shown Will.

The wax drop plate 214 contacts the lower surface of the wax drop plate 214 by preventing the plastic gas introduced through the first gas inlet 211 from being immediately discharged through the first gas outlet 215. The wax component mixed in the plastic gas in turn serves to collect on the bottom surface of the first body tube 212.

The second wax treatment tank 220 is interconnected to the first wax treatment tank 210 and the plastic gas discharge pipe 610 to cool the remaining plastic gas discharged from the first wax treatment tank 210 with cooling water. The wax generated while returning to the first wax treatment tank 210, and serves to discharge the residual plastic gas.

Here, the second wax treatment tank 220 is to separate the wax of the plastic gas discharged as it is not separated even in the first wax treatment tank 210 to discharge residual plastic gas for high purity oil reduction again. Technical means.

To this end, the second wax treatment tank 220 may be installed at least one or more as necessary to discharge the residual plastic gas of higher purity.

The second wax treatment tank 220 has a structure in which a plurality of microtubes 224 are mounted on a second body tube 222 installed at a predetermined height perpendicular to the ground.

The second body tube 222 has a second gas inlet 221 and the first wax treatment tank 210 interconnected to the first wax treatment tank 210 and the plastic gas discharge pipe 610 on the lower side. A second wax outlet 223 for returning the furnace wax is provided, and a second gas outlet 225 for discharging the remaining plastic gas is provided on the upper side.

Here, the second wax outlet 223 of the second wax treatment tank 220 and the wax receiving port 217 of the first wax treatment tank 210 are connected to each other by the wax return pipe 620.

The microtube 224 is formed parallel to the height direction of the second body tube 222 to form a flow path that is interconnected with the second gas inlet 221 and the second gas outlet 225. The coolant flowing into the coolant inlet 227 of the second body tube 222 through the branch water inlet 922 cools the outer circumferential surface of the microtube 224 and the branch water outlet 924 from the coolant outlet 229. Discharged through and returned to the cooling tower (CT).

On the other hand, on the wax return pipe 620 interconnecting the first wax treatment tank 210 and the heating tank 100, a wax intermediate storage tank 500 for temporarily storing the wax is further provided, the wax intermediate storage tank 500 ) Is to collect the wax generated by the continuous heating of the waste plastic (ps) to serve to prevent the phenomenon such as blocking the pipe while the wax is supplied to the reduction assembly 300 to be described later.

Here, the wax intermediate storage tank 500 has an intermediate wax inlet 502 connected to the bypass refund pipe 622 branched on the wax refund pipe 620 on the upper side, and the stored wax is stored in the heating tank ( An intermediate wax discharge port 504 connected to the bypass refund pipe 622 for discharging the wax refund pipe 620 to the side 100 is provided on the lower side, and the bypass refund pipe 622 is not specifically illustrated, but a heating wire is provided. It is possible to prevent the wax from being solidified after being wound and stored with a heat insulating material.

In addition, a flow motor 540 for forcibly discharging the wax may be further provided on the bypass tank 622 of the heating tank 100 to facilitate smooth discharge of the wax to the heating tank 100. .

Therefore, the wax intermediate storage tank 500 blocks the flow to the bypass refund pipe 622 toward the wax intermediate storage tank 500 in the initial operation of the waste plastic oil reduction device according to the present invention and the first wax When wax is discharged directly from the processing tank 210 to the heating tank 100 and the amount of wax generation is increased due to prolonged use, the wax is flowed into the bypass return pipe 622 of the wax intermediate storage tank 500 to temporarily store wax. You can do it.

Meanwhile, the reduction assembly 300 according to the present invention collects plastic gas discharged by being connected to the wax separation tank 200, more specifically, the second wax processing tank 220, and liquefied and reduced to oil. Do this.

In addition, the reduction assembly 300 is also connected to the heating tank 100 is connected to the heating tank 100 when the plastic gas in the heating tank 100 when the pressure is overheated by a predetermined pressure or more to stabilize and collect the plastic gas and liquefied reduction to oil It is to serve to, and is largely composed of the oil fractionation tank 310 and the gas cooler (320).

The oil fractionation tank 310 is provided with a gas-liquid container 312, an overpressure gas receiver 314, and a residual gas outlet 316 on the upper side, and an oil outlet 318 on the lower side. As a tank, the gas-liquid receiver 312 is one of the inlets connected to the second gas outlet 225 to receive a mixture of plastic gas and liquid.

In addition, the overpressure gas receiver 314 is one of the inlets for receiving the plastic gas discharged through the overpressure gas discharge pipe 630 from the overpressure plastic gas outlet 104 of the heating tank 100, the oil outlet ( 318 is an outlet for discharging oil as a raw material produced by cooling the plastic gas to the oil tank OT.

In addition, the lower side of the oil fractionation tank 310 may be provided with a drain 319 to facilitate the discharge of foreign matter.

Here, the overpressure gas discharge pipe 630 has a bypass pipe 632 connected to the purge pipe 700 for injecting nitrogen gas through the nitrogen tank NT to stabilize the plastic gas heated and pressurized to a predetermined pressure or more. It is further provided to prevent the explosion of the heating tank 100 due to the overheat pressurized plastic gas in advance.

The bypass pipe 632 is branched between the connection portion (j) of the purge pipe 700 and the overpressure gas discharge pipe 630 and the heating tank 100 and provided with a safety valve 634, the pressure above the set pressure When the plastic gas is overheated and pressurized, the safety valve 634 is opened to bypass the plastic gas, and then nitrogen gas is injected from the nitrogen tank NT into the overpressure gas discharge pipe 630 to stabilize it.

In addition, the gas cooler 320 is mounted on an upper side of the oil fractionation tank 310 to retain residual plastic gas discharged from the oil fractionation tank 310 without being reduced to oil through a plurality of heat exchange tubes 322. It serves to discharge through the gas outlet 324.

Here, the lower end of the heat exchange tube 322 is in communication with the oil fractionation tank 310, the cooling water inlet pipe 912 connected to the reservoir tank (WT) to the condensate inlet 321 of the gas cooler (320). The cooling water introduced through the cooling water circumferential surface of the heat exchange tube 322 is discharged from the condensate outlet 323 through the cooling water discharge tube 914 and returned to the water storage tank WT.

At this time, the branch water inlet pipe 922 and the branch water outlet pipe 924 for supplying the cooling water of the second wax treatment tank 220 are branched on the cooling water discharge pipe 914 to be used for the gas cooler 320. Part of the cooling water returned can be utilized.

According to the present invention, the reduction assembly 300, when the input amount of the waste plastic (ps) to be input to the heating tank 100 is 1 ton light oil of the approximate gasoline, heavy oil and heavy oil of the approximate gasoline In addition, a liquid oil containing various emulsions similar to bunker oil may be obtained.

Therefore, the oil obtained through the reduction assembly 300 according to the present invention may be used for various purposes after transporting and refining the oil refinery, and as the capacity of the heating tank 100 is increased, the reduction assembly 300 is increased. By installing a plurality of) will be able to refine the various oils as described above step by step.

Meanwhile, the backflow prevention tank 400 according to the present invention collects the residual plastic gas discharged from the reduction assembly 300, more specifically, the gas cooler 320 in the water contained therein, so that the heating tank 100 and the wax are absorbed. With the role of preventing the remaining plastic gas from flowing back to the separation tank 200 serves to discharge the treated after-treatment gas or to return to the auxiliary heat source of the heating burner (B).

Here, the backflow prevention tank 400 accommodates water therein and has a residual gas inlet 402, a collected water inlet 404, and an outlet 406 on the upper side, and a drain 407 for discharging foreign substances on the lower side. This is provided.

The residual gas inlet 402 is connected to the gas cooler 320 and the residual plastic gas discharged from the gas cooler 320 is introduced through the residual gas pipe 640 equipped with the safety valve 642. The collected water inlet 404 is connected to the coolant inlet pipe 912 connected to the reservoir tank WT.

Here, the end portion of the residual gas pipe 640 is to discharge the after-treatment gas which is submerged in water and collects the remaining plastic gas to be discharged to the discharge pipe 810 connected to the discharge port 406 on the upper side of the backflow prevention tank. .

In addition, the discharge port 406 is connected to the discharge pipe 810, the treated gas after processing from the discharge port 406 through the discharge pipe 810 to the atmosphere through the chimney (S) connected to the discharge pipe 810. Will be discharged to the air.

Here, the chimney (S) is equipped with an ignition device of the spark plug series such as an ignite unit (ignite unit) is a hazardous substance that is likely to remain by burning the after-treatment gas discharged through the discharge pipe 810 After the removal, it is exhausted in a harmless state.

At this time, on the residual gas pipe 640 is a pressure sensor 644 for detecting the pressure of the residual plastic gas flowing into the backflow prevention tank 400 between the gas cooler 320 and the safety valve 642. It is provided.

In addition, the exhaust pipe 810 is connected to the heat insulation chamber C and the three-way safety valve 812 on which the heating tank 100 is disposed, and returns a post-treatment gas for combustion assistance in the heat insulation chamber C. It is preferable that the combustion auxiliary pipe 820 is further provided.

Here, the after-treatment gas is the amount of waste plastic (ps) input to the heating tank 100, for example, 1 ton when the inlet pressure of the residual plastic gas detected by the pressure sensor 644 is a predetermined pressure or more. When it is 3kg / ㎠ or more as a reference, it is discharged into the atmosphere through the discharge pipe 810, when it is below a predetermined pressure is to be returned to the adiabatic chamber (C).

Therefore, the aftertreatment gas can be supplied to the auxiliary heat source of the heating burner B mounted in the adiabatic chamber C or released into the atmosphere in a harmless state.

As described above, it can be seen that the present invention has a basic technical idea that it is possible to safely obtain oil, which is a raw material of high purity, and to provide an eco-friendly waste plastic oil reduction device.

In addition, many modifications and applications are possible to those skilled in the art within the scope of the basic technical idea of the present invention.

According to the present invention of the above configuration can be expected the following effects.

First of all, due to the poor flow due to the wax contained in the plastic gas generated from the heated waste plastic, the oil reduction is not smooth, and the wax is separated and stored in the middle to be returned to the heating tank as compared to the prior art which includes the risk of an accident such as an explosion. In addition, by adopting a device for the final collection and treatment of residual plastic gas with a backflow prevention tank, it is possible to obtain a safer and higher purity raw material oil.

In addition, the present invention employs a heating tank that is agitated and heated by vibrating molten plastic boiled by mounting a vibrating plate to the inner cylinder, so that a separate configuration such as a stirrer is unnecessary and energy required for heating is immediately provided in the apparatus. Since it can be procured, the energy cost can be greatly reduced.

In addition, the present invention adopts a wax intermediate storage tank that stores the wax classified in the wax separation tank in the middle to prevent various accidents and poor oil reduction problems due to flow failure in each pipe, thereby reducing energy consumption due to overload. Can be reduced.

In addition, the present invention adopts a backflow prevention tank for post-treatment of the residual plastic gas separated through the reduction assembly to the device, to discharge the after-treatment gas discharged in a harmless state through the chimney equipped with the ignition device, or post-treatment By using a portion of the gas as an auxiliary heat source for heating the heating tank has the advantage that can solve the problem of consumption of the heat source for operating the device.

In addition, the present invention can be used by classifying a variety of oils by mounting a plurality of reducing assemblies according to the installation environment, so that even in the smallest general workplaces that can not be built a large-scale petroleum refining equipment at a low cost and various uses It is a very urgent and efficient invention in a country that lacks petroleum resources, such as the ability to obtain a variety of oils.

Claims (11)

In the device for reducing the oil to the liquid raw material by applying heat to the waste plastic, At least one heating tank 100 for discharging the plastic gas generated by heating the pulverized thrown waste plastic below the combustion temperature to liquefy and vaporize, and stirring the molten plastic due to the vibration of the liquefied molten plastic boiling; A wax separation tank 200 for delaying the flow of the discharged plastic gas connected to the heating tank and returning the generated wax to the heating tank, and continuously discharging the remaining plastic gas; It is connected to each of the wax separation tank and the heating tank, respectively, and collect the plastic gas discharged from the wax separation tank to liquefy and reduce the oil into the oil, and stabilize and collect the plastic gas discharged from the heating tank to liquefy and reduce the oil. Reduction assembly 300; And A backflow prevention tank which collects the remaining plastic gas discharged from the reduction assembly in the water contained therein to prevent the remaining plastic gas from flowing back to the wax separation tank and discharges the treated after-treatment gas or returns it to the heating source of the heating tank. 400, the oil reduction device of the waste plastic comprising a. The method of claim 1, The heating tank 100, It is arranged in the heat insulating chamber (C) provided with a heating burner (B) on one side and provided with a plastic gas outlet (102), an overpressure plastic gas outlet (104), and a wax refund port (106), respectively. Outer cylinder 110 is provided with (112); A cylindrical inner cylinder 120 embedded in the outer cylinder and connected to the plastic gas outlet, the overpressure plastic gas outlet, and the wax refund port; And A lower surface is mounted spaced apart from the inner circumferential surface of the inner cylinder and a semi-cylindrical vibration mounting plate 130 of both ends opening; The waste plastic oil reduction device, characterized in that the molten plastic is agitated by the vibration given by the boiling of the molten plastic introduced into the space between the vibration mounting plate and the inner cylinder inner peripheral surface. The method of claim 2, The wax separation tank 200, It is interconnected by the heating tank 100 and the plastic gas discharge pipe 610 to return the wax generated while collecting the plastic gas generated in the heating tank to delay the flow to the wax return port 106 side of the heating tank, A first wax treatment tank 210 for discharging residual plastic gas; And The wax generated while cooling the residual plastic gas discharged from the first wax treatment tank with cooling water is interconnected by the first wax treatment tank and the plastic gas discharge pipe 610 to return the wax to the first wax treatment tank, and the remaining plastic The second wax treatment tank 220 for discharging the gas; Oil reduction device for waste plastic, characterized in that consisting of. The method of claim 3, wherein The first wax treatment tank 210, A first gas inlet 211 and a first wax outlet 213 returning wax to the heating tank are connected to the heating tank 100 and the plastic gas discharge pipe 610 at a lower side perpendicular to the ground. A first gas outlet 215 interconnected to the second wax treatment tank 220 and a plastic gas discharge pipe on an upper side thereof, and a wax receiving port 217 for receiving wax returned from the second wax treatment tank. First body tube 212 having a; And And a plurality of wax drop plates (214) spaced downwardly inclined downward on the inner surface of the first body tube along a height direction of the first body tube. The method of claim 4, wherein The second wax treatment tank 220, A second gas inlet 221 which is perpendicular to the ground and is connected to the first wax treatment tank 210 and a plastic gas discharge pipe at a lower side thereof, and a second wax outlet 223 which returns wax to the first wax treatment tank; A second body tube 222 having a second gas outlet 225 for discharging the remaining plastic gas on the upper side thereof; And And a plurality of microtubes 224 embedded in parallel with a height direction of the second body tube to form a flow path interconnected with the second gas inlet and the second gas outlet. Cooling water flowing from the outside of the second body tube to cool the micro-tube outer peripheral surface, characterized in that the waste plastic oil reduction device. The method of claim 5, wherein On the wax refund pipe 620 connecting the first wax treatment tank 210 and the heating tank 100, Wax intermediate oil storage device for temporarily storing the wax, characterized in that the oil reduction device for waste plastics further comprising. The method of claim 6, The wax intermediate storage tank 500, An intermediate wax inlet 502 connected to the bypass refund pipe 622 branched on the wax refund pipe 620 is provided on the upper side, An intermediate wax outlet 504 connected to the bypass refund pipe for discharging the stored wax to the wax refund pipe on the heating tank 100 is provided on the lower side. The bypass refund pipe of the waste plastic, characterized in that the heating wire 520 is wound and the insulation material 530, the flow motor 540 for forcibly discharging the wax on the bypass tank of the heating tank side is further provided. Oil reducing device. The method according to any one of claims 1 to 5, The reduction assembly 300, A gas-liquid receiving port 312 connected to the second gas outlet 225 on the upper side to receive a mixture of plastic gas and liquid, and an overpressure gas discharge pipe from the overpressure plastic gas outlet 104 of the heating tank 100. The over-pressure gas receiving port 314 for receiving the plastic gas discharged through the 630 and the remaining gas discharge port 316 provided with a safety valve 315, respectively, and the lower side is a raw material of the plastic gas cooled An oil fractionation tank 310 having an oil outlet 318 for discharging oil to an oil tank; And A gas cooler 320 mounted at an upper side of the oil fractionation tank and discharging the residual plastic gas discharged from the oil fractionation tank through the residual gas outlet 324 through a plurality of heat exchange tubes 322. Cooling water flowing from the outside of the gas cooler cools the outer peripheral surface of the heat exchange tube, characterized in that the waste plastic oil reduction device. The method of claim 8, The overpressure gas discharge pipe 630, Is connected to the purge pipe 700 is injected with nitrogen gas to stabilize the plastic gas, Oil reduction of the waste plastic, characterized in that it is further provided with a bypass pipe 632 branched between the connection portion (j) of the purge pipe and the overpressure gas discharge pipe and the heating tank 100 and provided with a safety valve 634. Device. The method of claim 8, The backflow prevention tank 400, Residual gas inlet 402 which is connected to the gas cooler 320 and the residual plastic gas discharged from the gas cooler through the residual gas pipe 640 equipped with a safety valve 642 is provided on the upper side, Receives water flowing into the collection water inlet 404 provided on the upper side, the end of the residual gas pipe is submerged in water to collect the residual plastic gas is treated after the discharge gas outlet of the upper side of the counter flow prevention tank The oil reduction device of the waste plastic, characterized in that for discharging to the discharge pipe (810) connected to the (406). The method of claim 10, On the residual gas pipe 640, Between the gas cooler 320 and the safety valve 642 is further provided with a pressure sensor 644 for detecting the pressure of the residual plastic gas flowing into the backflow prevention tank 400, On the discharge pipe 810 on the upper side of the backflow prevention tank, It is further provided with a combustion auxiliary pipe 820 connected to the heat insulating chamber (C) in which the heating tank 100 is arranged and the three-way safety valve 812 to return the after-treatment gas for combustion aid in the heat insulating chamber, The aftertreatment gas is discharged to the atmosphere through the discharge pipe or returned to the heat insulation chamber according to the inflow pressure of the residual plastic gas detected by the pressure sensor, it is returned to the heat insulating chamber.

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