JPH10338886A - Process and apparatus for liquefying plastic material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that the treating capacity of a conventional plastic material liquefaction apparatus is low since it is of a batch type and after a certain amt. of a plastic material is completely gelled in a melting vessel, the resultant gel is sent to a thermal decomposition vessel to be gasified. SOLUTION: In this process, a plastic material is heated to gasify an oil component contained therein, and a gas obtd. is liquefied by cooling. The material is transported continuously through a heat guide pipe 1; the temp. in the heat guide pipe 1 is gradually increased from the inlet side of the heat guide pipe 1 to the outlet side in such a temp. gradient that the solid material is not carbonized until it gels; the resultant gel is further subjected to high-temp. heating to gasify the oil component in the gel; and thus, continuous treatment without waiting time is enabled and the carbonization of the material in the course of gelling is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for liquefying a plastic raw material, wherein the amount of plastic waste can be reduced and an oil component can be extracted from the plastic raw material.

[0002]

2. Description of the Related Art In recent years, the amount of plastic waste has been increasing year by year, but plastic waste cannot be incinerated (the incinerator is damaged in a short time due to its high calorie).
Most are disposed of as landfill. By the way, in recent years, it has become difficult to secure a landfill site for waste, which has become a major social problem.

[0003] Plastics, on the other hand, are petroleum products and contain large amounts of energy. In recent years, attempts have been made to heat plastic waste, extract oil components from the plastic waste, and reuse resources.

[0004] That is, in recent years, an apparatus for liquefying plastic raw materials as shown in FIG. 5 has been developed. In this conventional oil treatment apparatus, a certain amount of a plastic raw material P (mainly a crushed plastic waste) is stored in a melting tank 102 by a supply apparatus 101, and the melting tank 102
Heating device (hot air generating furnace) 103
Then, the whole amount of the plastic raw material is gelled in the melting tank 102 by heating with the high-temperature air from. Next, the gel-like raw material in the melting tank 102 is subjected to a thermal decomposition tank 105 by a pump 104.
The gelled raw material in the pyrolysis tank 105 is heated by high-temperature air from a heating device (hot air generating furnace) 106 to gasify an oil component in the gelled raw material. The gaseous oil component gasified in the pyrolysis tank 105 is led to a neutralization device (injection of an alkaline solvent with a scrubber) 108 to obtain a PH.
After adjusting the (pH), it is liquefied by a cooling device (cooling condenser) 109 and the liquid (oil) is stored in an oil storage tank 110. On the other hand, sludge that has not been gasified in the pyrolysis tank 5 is stored in the sludge box 107.

The temperature at which a plastic raw material gels differs somewhat depending on the type of raw material, but is generally about 24 degrees.
It is around 0 ° C. On the other hand, if the plastic raw material is rapidly heated to a high temperature (the temperature rise gradient is steep), it will be carbonized before melting (gelling), and once the carbonized raw material is heated further, it will not be gasified. Has properties. In particular, when a massive plastic raw material is rapidly heated to a high temperature, it takes a long time for heat to be transmitted to the central portion due to poor thermal conductivity, and there is a problem that carbonization occurs before gelling. In this way, the carbonized raw material is
Despite its high oil content, it is disposed of as sludge. The temperature at which carbonization occurs varies depending on the type of plastic raw material. For example, in the case of raw materials such as polyethylene, polypropylene, and polystyrene, carbonization occurs at about 250 ° C. when rapidly heated.

[0006] From the characteristics of such plastic raw materials,
In the conventional plastic raw material oil treatment apparatus shown in FIG.
In the melting tank 102, a temperature at which gelation is possible (for example, 2
(About 50 ° C.), and the plastic raw material is gelled without carbonizing.
Then, after the entire amount of the plastic raw material in the melting tank 102 has gelled, the gelled raw material is sent to the thermal decomposition tank 105 by the pump 104, where it is heated to a high temperature (for example, about 450 ° C.).
I am trying to do it.

[0007]

However, in the conventional plastic raw material oil treatment apparatus shown in FIG. 5, a so-called batch system, that is, after a certain amount of plastic raw material is gelled in the melting tank 102, and then the gelled state is obtained. Raw material is pyrolyzed in tank 10
Since the gas is transferred to the side 5 and gasified, a waiting time occurs in each of the devices (the melting tank 102 and the thermal decomposition tank 105), and there is a problem that the processing capacity is low.

[0008] In view of the above-mentioned problems of the conventional plastic raw material liquefaction processing apparatus, the present invention can improve the liquefaction processing capacity from plastic raw materials (mainly plastic waste), and the plastic raw material is being liquefied. It is an object of the present invention to provide a method and an apparatus for liquefying a plastic raw material, which can prevent carbonization of the raw material.

[0009]

The present invention has the following structure as means for solving the above-mentioned problems.

[0010] The invention of claim 1 of the present application is to heat a plastic raw material,
The present invention is directed to a method of liquefying a plastic raw material in which an oil component in the raw material is gasified and then the gaseous oil component is cooled and liquefied. In addition, plastic waste is mainly used as a plastic raw material.
Also, if the plastic raw material is crushed into small pieces in advance, the heat is quickly transmitted to the center of the raw material particles.

According to the first aspect of the present invention, the plastic material is continuously transferred into the heat guide tube, and the temperature in the heat guide tube is changed from the inlet side to the outlet side of the heat guide tube. The solid material is heated at a temperature gradient such that the solid material does not carbonize until the solid material gels, and then the gelled material is further heated to a higher temperature. It is characterized in that the oil component inside is gasified.

The temperature gradient for heating the inside of the heat guide tube (the rate of increase in sensitivity per time) is related to the heating temperature of each part of the heat guide tube and the transfer speed of the raw material. (Temperature and transfer speed) are set to a gentle temperature gradient such that the raw material transferred through the heat guide tube does not carbonize before gelling.

According to the first aspect of the present invention, since the plastic raw material is continuously transferred in the heat induction pipe, the solid raw material is gelled, and the gel raw material is gasified. Can be performed in a series of heat guide tubes, and there is no waiting time in each step. Further, since the temperature in the heat guide tube is gradually increased from the inlet side to the outlet side of the heat guide tube, the raw material does not carbonize until the solid raw material gels, Most of the raw material can be effectively gasified (finally converted to oil).

The invention of claim 2 of the present application is directed to an oil treatment apparatus for performing the oil treatment method of claim 1 described above.

[0015] The oil treatment apparatus according to claim 2 is
A heat induction tube for guiding the plastic raw material, a continuous transfer device for continuously transferring the raw material in the heat induction tube, a heating device for heating the raw material in the heat induction tube and gasifying an oil component in the raw material, A liquefaction treatment device is provided for cooling and liquefying the gaseous oil component discharged from the outlet of the heat induction pipe.

As the continuous transfer device, a screw feeder is preferable. As described above, when the screw feeder is used as the continuous transfer device, the raw material in the heat guide tube is transferred while being stirred. Note that a plurality of heat guide tubes can be used in parallel, and in that case, a continuous transfer device is provided for each heat guide tube.

Further, the heating device is constituted by a plurality of divided heating devices capable of providing a temperature difference, and the divided heating device gradually raises the temperature from the inlet side to the outlet side of the heat induction tube. I'm trying to get. In this case, the heating device is preferably divided into, for example, three or more divisions, and the temperature in the heat induction pipe is gradually increased from the inlet side to the outlet side in each divided heating device (to prevent the raw material from being carbonized). To). Further, it is preferable that each of the divided heating devices detects the temperature of the corresponding portion of the heat induction tube with a temperature detector, and controls the heat value based on the detected temperature from each of the temperature detectors.

In the oil treatment apparatus according to the second aspect of the present invention, the solid raw material is gelled sequentially only by continuously charging the solid plastic raw material into the inlet side of the heat guide tube. The oil component can be gasified. Further, since the heating device for heating the inside of the heat induction tube is divided into a plurality of heating devices, the inside of the heat induction tube can be gradually heated from the inlet side to the outlet side, so that the solid raw material can be heated. Can be heated with a temperature gradient such that carbonization does not occur before gelling.

According to a third aspect of the present invention, in the oil processing apparatus according to the second aspect, the heating device includes a divided heating chamber divided into a plurality of sections in the longitudinal direction of the heat induction pipe. With each heating means for individually heating the air in each divided heating chamber,
The heat induction tube is installed so as to cross each divided heating chamber.

As a heating means for heating the air in each divided heating chamber, for example, a hot air generating furnace heated by a burner is used, and the hot air from each hot air generating furnace is supplied to each divided heating chamber. can do. Alternatively, only each burner may be used as a heating means, and each burner may directly heat each divided heating chamber.

As described above, in the apparatus using a burner as the heating means, the oil generated by the oil processing apparatus can be used as fuel.

According to a fourth aspect of the present invention, there is provided the oil-treating apparatus according to the second aspect, wherein a plurality of electric heating means having different heating temperatures are used as the heating device. The means are arranged from the inlet side to the outlet side of the heat guide tube in order from the one having the lowest calorific value.

The electric heating means may be any of an electromagnetic induction heating method and an electric resistance heating method. It is preferable that each of the electric heating means is wound around the outer peripheral surface of the heat induction tube and installed so that heating is performed from the entire outer periphery of the heat induction tube.

As described above, when the electric heating means is used as the heating device, the whole oil processing apparatus can be made compact,
In addition, the temperature control of the heat generating portion can be performed relatively easily.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIGS. 1 to 3 show an oil treatment apparatus according to a first embodiment of the present invention, and FIG. 2 shows an oil treatment apparatus according to the second embodiment.

The oil-treating apparatus according to the first embodiment shown in FIGS. 1 to 3 supplies a heat guide tube 1 for guiding a raw material P made of pulverized plastic, and supplies the raw material P to an inlet 1 a of the heat guide tube 1. And a continuous transfer device 2 for continuously transferring the raw material in the heat guide tube 1 from the inlet 1a side to the outlet 1b side.
A heating device 3 for heating the raw material in the heat induction tube 1, a liquefaction treatment device 8 for liquefying the gaseous oil component R discharged from the outlet 1 b of the heat induction tube 1, and an outlet 1 b of the heat induction tube 1. Sludge box 17 for storing released sludge S
And a controller 7 for controlling the temperature of the heating device 3 and the driving speed of the continuous transfer device 2 as a basic structure.

In the first embodiment, a total of four sets of the heat guide tube 1 and the continuous transfer device 2 are used as shown in FIG. 2, but the number of sets of the heat guide tube 1 and the continuous transfer device 2 is May be changed as appropriate.

As shown in FIG. 1, each of the heat guide tubes 1, 1...
The second heat induction pipe 12 is connected to the outlet of the heat induction pipe 11 and is inclined upward at an angle of about 30 °.

Each of the continuous transfer devices 2, 2,... Is accommodated in a first screw feeder 21 housed in a first heat induction tube 11 and in a second heat induction tube 12 as shown in FIG. And a second screw feeder 22. Each first
The screw feeders 21 are each driven by a motor 23, and the second screw feeders 22 are each driven by a motor 24. The driving speed of these motors 23 and 24 is controlled by a signal from the controller 7.

In another embodiment, one heat induction tube 1 is used, and the continuous transfer device 2 can be applied by one screw feeder. In addition, heat induction tube 1
Can be installed horizontally as a whole.

The raw material storage chamber 6 is installed above the inlet 1 a of each first heat induction pipe 11. The raw material P in the hopper 4 is sequentially charged into the raw material storage chamber 6 by the supply device 5. When vinyl chloride is mixed in the raw material P to be used, slaked lime Q may be mixed into the hopper 4 (or directly into the raw material storage chamber 6) by a predetermined amount. The operation of the slaked lime Q will be described later.

The heating device 3 of the first embodiment has a total of 3
First to third divided heating chambers 31, 32, 3
3 and each of the hot-air generating furnaces 41, 42 and 43 for individually heating the divided heating chambers 31 to 33. That is, the first
The third divided heating chambers 31, 32, and 33 are sequentially installed in an adjoining state from the inlet 1a side to the outlet 1b side of the heat induction tube 1, and each of the divided heating chambers 31 to 33 is heated with hot air. The heating is performed by the hot air generated in the generating furnaces 41 to 43. Each of the hot air generating furnaces 41 to 43 is individually heated by a burner 44, and is further heated by each of the burners 44, 44, 44,.
The combustion gas G from the blower 44 is supplied to the blowers 48, 48,
At 48, each hot-air generating furnace 41-43, each divided heating chamber 31-3
3. It circulates through each connection pipe 45-47.

The temperatures in the divided heating chambers 31 to 33 are detected by temperature detectors 61 to 63, respectively. Then, based on the detected temperatures from the temperature detectors 61 to 63, the controller 7 causes the hot air generating furnaces 41 to 4 to operate.
3 burner 44, 44, 44 combustion control (HI-LOW
Control or ON-OFF control).

Each of the heat induction tubes 1, 1...
It is installed so as to cross 1-33. The outlets 1b of the heat induction tubes 1, 1,... Are connected to one horizontal collecting pipe 13 in the third heating chamber 33. The collecting pipe 13 has a gas passage 14 (one) extending upward,
Sludge passage 15 extending downward (exit 1b of each heat induction tube)
Are connected to the position corresponding to (1). The gas passage 14 is guided to the outside after being inserted through the third hot air generating furnace 43. After each sludge passage 15 is assembled at the screw feeder 16, the sludge box 1
7 is connected.

The liquefaction processing device 8 includes a neutralization device 8 for neutralizing the gaseous oil component R supplied through the gas passage 14.
1, a cooling device (cooling condenser) 82 for cooling the gaseous oil component R, a gas-liquid separation device 83, and an oil storage tank 84. The neutralizer 81 adjusts PH (pH) by injecting an alkaline solvent into the gaseous oil component R with a scrubber. The cooling device 82 cools the gaseous oil component R to liquefy the oil component. Further, the gas-liquid separation device 83 converts the gas-liquid mixture cooled by the cooling device 82 from
The liquid (oil) is separated into a liquid and a gas, and the separated liquid (oil) is stored in an oil storage tank 84, and the gas (containing an oil component) is supplied to a hot air generator. The liquefaction processing apparatus 8 of this embodiment is a known apparatus, and a detailed description thereof will be omitted. The configuration of the liquefaction processing device 8 is not limited to the illustrated example, but may be any device that can cool the gaseous oil component and liquefy the oil component.

The oil treatment apparatus of the first embodiment is used as follows. First, the temperature in the first heating chamber 31 is set to about 200 ° C. where the solid plastic raw material is not carbonized,
The temperature in the second heating chamber 32 is maintained at about 240 ° C. at which the plastic raw material can be gelled, and the temperature in the third heating chamber 33 is maintained at about 450 ° C. at which the gelled raw material can be gasified, Each hot air generating furnace 41 to 43 is controlled by the controller 7.
The combustion amount in each of the burners 44, 44, 44 is set in advance. The temperatures in the divided heating chambers 31 to 33 are always detected by the temperature detectors 61 to 63, respectively, and based on the detected temperatures from the temperature detectors 61 to 63, the signals from the controller 7 are used. Burners 44 of each of the hot air generating furnaces 41 to 43,
The control of the amount of combustion is automatically performed for 44,44. or,
The respective drive speeds of the first screw feeder 21 and the second screw feeder 22 are also set by the controller 7. For example, the raw material in the heat induction tube 1 passes through the first heating chamber 31 in about 30 to 40 minutes, and the second heating chamber 3
2 in about 80-90 minutes, and the third heating chamber 33
The driving speeds of the first screw feeder 21 and the second screw feeder 22 are set in advance so as to pass in about 60 minutes. Also, each screw feeder 21,
The driving speed of the motor 22 is based on the detected temperatures from the temperature detectors 61 to 63, and when the detected temperature is low, the driving is performed at a low speed in proportion to the detected temperature, and when the detected temperature is high, the driving is performed at a high speed in proportion to the detected temperature. You may do so.

On the other hand, as shown in the flow chart of FIG. 3, the plastic raw material is crushed in advance in order to improve the thermal conductivity, and the crushed plastic (raw material) P is supplied into the raw material storage chamber 6 by the supply device 5. To At this time,
When vinyl chloride is contained in the raw material P, slaked lime Q is mixed with the raw material P in an appropriate amount. When the slaked lime Q is heated and melted in the heat induction tube 1,
It combines with the chlorine component in vinyl chloride to form calcium chloride, which has the effect of suppressing the generation of chlorine gas.

When the solid raw material P is introduced into the raw material storage chamber 6, the solid raw material falls into the inlets 1a of the respective heat guide tubes 1 (first heat guide tubes 11) from the bottom thereof, and the solid transfer material is transferred by the continuous transfer device 2. It is slowly transferred through the heat induction tube 1. At this time, since the screw feeder is used as the continuous transfer device 2, the raw material of the heat induction tube 1 moves while being stirred. Then, when the solid raw material is transferred to a portion corresponding to the first heating chamber 31 in the heat induction pipe 1, the solid raw material is gradually heated by the heat (about 200 ° C.) in the first heating chamber 31. You. When the solid raw material is transferred from the inlet 1a of the heat guide tube 1 to a position corresponding to the first heating chamber 31, the solid raw material is heated at a stretch from a temperature near normal temperature to a relatively high temperature range of about 200 ° C. However, at this temperature of about 200 ° C., no carbonization occurs in the raw material. The raw material in the heat induction tube 1 passes through the first heating chamber 31 in about 30 to 40 minutes. During that time, even if the raw material is a lump, the raw material is uniformly heated to the center thereof. When passing through the 31 portion, the raw material has been uniformly softened.

Heat induction tube 1 that has passed through first heating chamber 31
The softened raw material therein is transferred to a portion corresponding to the second heating chamber 32. By the way, the temperature of the second heating chamber 32 is 240 ° C.
Before and after, depending on the type of plastic raw material, the temperature may cause carbonization. However, the raw material transferred to the portion corresponding to the second heating chamber 32 has already been heated to about 200 ° C. and softened. As described above, the temperature gradient when moving from the first heating chamber 31 to the second heating chamber 32 is small (the temperature difference is about 40 ° C.), and the softened raw material is smoothly gelled without being carbonized. I'm sullen. And
The raw material in the heat induction tube 1 is supplied to the second heating chamber 32 (240 ° C.
(Fore and aft) over about 80 to 90 minutes, and at this time, the entire amount of the raw material transferred to the vicinity of the outlet of the second heating chamber 32 is completely gelled.

Next, the gel-like raw material in the heat induction tube 1 that has passed through the second heating chamber 32 is transferred to a portion corresponding to the third heating chamber 33 (around 450 ° C.). At this time, the gel-like raw material (heated to about 240 ° C.) is rapidly heated (temperature difference about 210 ° C.) when approaching the third heating chamber 33, but the state of the gel-like raw material (240 ° C.) ), Carbonization does not occur even after rapid heating. The gel-like raw material that has reached the third heating chamber 33 is heated at a high temperature of about 450 ° C. in the heat induction tube 1, and the gel-like raw material passes through the third heating chamber 33 at a gasification temperature ( For example, around 420 ° C)
The oil component in the gelled raw material is gasified.

As described above, the gaseous oil component R gasified in each of the heat induction tubes 1, 1,... Corresponding to the third heating chamber 33 is:
The gas is discharged from each outlet 1b into the collecting pipe 13 and further flows through the gas passage 14 to the liquefaction processing device 8 side. Then, the gaseous oil component R is neutralized to PH (pH) by a neutralization device 81 and then sent to a cooling device 82 where it is cooled and liquefied. )
And the liquid (oil) is stored in an oil storage tank 84.

On the other hand, in the heat induction pipe 1, sludge not gasified from the gelled raw material is transferred to the continuous transfer device 2.
The heat is discharged from the outlets 1b of the heat guide tubes 1, 1... Into the respective sludge passages 15 by the (second screw feeder 22), and is subsequently stored in the sludge box 17 by the screw feeder 16. In addition, when vinyl chloride is contained in the raw material P and slaked lime Q is mixed in the raw material, when the mixed raw material gels in the heat induction tube 1,
The chlorine in the vinyl chloride and the calcium in the slaked lime combine to form calcium chloride, and the calcium chloride is contained in the sludge S. And this sludge containing calcium chloride is refined later,
Calcium chloride can be obtained as a by-product.

In each of the above steps, the raw material P is stored in the raw material storage chamber 6.
While there is, it is performed continuously. When the amount of the raw material P in the raw material storage chamber 6 decreases, the raw material P in the hopper 4 is supplied to the raw material storage room 6 by the supply device 5.

As described above, when the oil treatment apparatus according to the first embodiment is used, the raw material P made of the pulverized plastic is simply charged into the raw material storage chamber 6, and is continuously gelled and then gasified. be able to. Further, since the raw material P is heated with a gentle temperature gradient until the raw material P is gelled and transported while stirring, the raw material P can be completely gelled without carbonizing the entire amount of the raw material. Therefore, as much oil as possible can be extracted from the plastic raw material, and the amount to be disposed of as sludge can be reduced accordingly. By the way, when 1 ton of waste plastic raw material (not including vinyl chloride and slaked lime) is treated using the oil treatment apparatus of this embodiment, the material balance is 1000 liters of produced oil and 10 kg of sludge. Met. Also, 1 ton of waste plastic raw material and 30 vinyl chloride
When 0 kg and 90 kg of slaked lime were mixed, the mass balance was 800 liters of produced oil and 200 kg of sludge (which contains a large amount of calcium chloride as a by-product).

Incidentally, the oil generated by the liquefaction processing apparatus of the first embodiment can be used as fuel for each of the hot-air generating furnaces 41, 42, 43.

In the liquefaction processing apparatus of the second embodiment shown in FIG. 4, one heat induction tube 1 is installed in a horizontal direction. Further, as the heating device 3, an electric heating means such as an electromagnetic induction heating method or an electric resistance heating method is employed. In the following description, this electric heating means is referred to as an electric heater.

In the second embodiment, three (first to third) electric heaters 51, 52, and 53 having different heating temperatures are used as the heating device 3. Incidentally, the heat generation temperature of the first electric heater 51 is about 200 ° C., and the second electric heater 52
The heat generation temperature of the second electric heater 53 is about 240 ° C., and the heat generation temperature of the third electric heater 53 is about 450 ° C. In other embodiments, the first to third electric heaters 51, 52, 5
3, the same temperature controller 71,
At 72 and 73, the temperature may be controlled to a predetermined heat generation temperature.

The electric heaters 51, 52,
Numerals 53 are arranged from the inlet 1a side to the outlet 1b side of the heat induction tube 1 in order from the one with the lowest calorific value. In the illustrated example, the first to third electric heaters 51, 52, 53
Is wound around the outer peripheral surface of the heat induction tube 1 in the same length range, and the ratio of the time heated by each electric heater to the raw material transfer speed is the same (for example, every one hour). However, the length of each electric heater may be relatively changed to change the ratio of the heating time by each electric heater.

In FIG. 4, reference numeral 25 denotes a screw feeder (to be the continuous transfer device 2) inserted into the heat guide tube 1, reference numeral 26 denotes a motor for driving the feeder, and reference numeral 54 denotes each electric heater 51, It is a heat insulating material covering the outside of 52 and 53, and other reference numerals are the same as those of the first embodiment.

In the oil treatment apparatus of the second embodiment, since the electric heating means is used as the heating device 3, the entire oil treatment apparatus can be made compact, and the temperature control is performed by the first method. It is simpler and more reliable than the hot air generator of the embodiment. The same operation as that of the first embodiment can be obtained in the second embodiment.

[0051]

The method and apparatus for liquefying plastic raw materials according to the present invention have the following effects.

That is, the plastic raw material P is transferred to the heat induction tube 1
And the step of gelling the solid raw material and the step of gasifying the gel raw material can be performed in a series of heat induction pipes 1, and furthermore, waiting for each step. Since there is no time, there is an effect that the processing capacity is greatly improved as compared with the conventional example shown in FIG.

Further, the temperature in the heat induction tube 1 is
The temperature is gradually increased from the inlet 1a side to the outlet 1b side of the raw material, so that the raw material does not carbonize before the solid raw material P gels, and most of the raw material is effectively gasified ( In the end, it is possible to reduce the amount of sludge to be disposed of.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an oil treatment apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a flowchart of an oiling treatment method performed using the oiling treatment device of FIG. 1;

FIG. 4 is a schematic side view of an oil treatment apparatus according to a second embodiment of the present application.

FIG. 5 is a schematic view of a conventional oil treatment apparatus.

[Explanation of symbols]

1 is a heat guide tube, 2 is a continuous transfer device, 3 is a heating device, 7 is a controller, 8 is a liquefaction treatment device, 14 is a gas passage, 1
5 is a sludge passage, 17 is a sludge box, 21 and 22
2, 25 are screw feeders, 31 to 33 are divided heating chambers, 41 to 43 are hot air generators, 44 is burners, and 51 to 5
3 is an electric heating means, 61 to 63 are temperature detectors, and P is a plastic raw material.

Claims (4)

[Claims] 1. A method for liquefying a plastic raw material, comprising heating a plastic raw material to gasify an oil component in the raw material, and then cooling and liquefying the gaseous oil component, The raw material is continuously transferred into the heat guide tube (1), and the temperature in the heat guide tube (1) is gradually increased from the inlet side to the outlet side of the heat guide tube (1). Then, the temperature of the solid raw material is raised at a temperature gradient such that the solid raw material does not carbonize until the solid raw material gels, and then the gelled gel raw material is further heated to a high temperature to convert the oil component in the gel raw material into a gas. A method for liquefying plastic raw materials, characterized in that: 2. A heat guide tube (1) for guiding a plastic material, a continuous transfer device (2) for continuously transferring a material in the heat guide tube (1), and a material in the heat guide tube (1). Heating device for heating to gasify the oil component in the raw material (3)
And a liquefaction processing device (8) for cooling and liquefying the gaseous oil component discharged from the outlet of the heat induction pipe (1), and the heating device (3) is capable of having a temperature difference. An oil treatment apparatus for a plastic raw material, characterized in that the apparatus is constituted by the divided heating device described above, so that the temperature can be gradually increased from the inlet side to the outlet side of the heat induction pipe (1). 3. The heating device according to claim 2, wherein:
A plurality of divided heating chambers (31 to 33) divided into a plurality in the longitudinal direction of the heat induction pipe (1), and respective heating means (41 to 41) for individually heating air in the divided heating chambers (31 to 33). 4
3), and the heat induction tube (1) is provided in each of the divided heating chambers (31 to 3).
3) An apparatus for liquefying plastic raw materials, which is installed so as to cross each inside. 4. The heating device according to claim 2, wherein:
A plurality of electric heating means (51-53) having different heat-generating temperatures are used, and the electric heating means (51-53) are sequentially arranged from the inlet side of the heat induction pipe (1) in ascending order of the calorific value. An apparatus for liquefying plastic raw materials, wherein the apparatus is disposed toward an outlet side.