JP7511865B2 - Oil recovery equipment - Google Patents

Description

Patent Law Article 30, paragraph 2 applicable. Name of item 1 ▲1▼ Distribution date December 26, 2019 ▲2▼ Recipients Yoichi Kodera, Toshiya Hanano, Seishin Matsumoto, Mitsugu Yokoyama, Hideo Nishihata, Kazuhiko Oishi, Norihiko Toyoshima, Kenji Sato, Mikito Maruyama, Katsuhide Murata, Hiroyasu Kondo, Nobushi Yoshigaki, Takashi Onoda, Manabu Asami, Katsuhiko Takeda, Yoshiki Fukumoto, Masahide Suzuki, Shuji Sudo, Masataka Tsukada, Hiroshi Yamaguchi Name of item 2 ▲1▼ Date of website posting December 26, 2019 ▲2▼ Website address https://www.g-a-p. JP Item name 3 ▲1▼ Date of submission June 4, 2019 ▲2▼ To be submitted Japan Chamber of Commerce and Industry's FY2018 Second Supplementary Budget Small Business Sustainability Subsidy Grant Project Item name 4 ▲1▼ Distribution start date December 26, 2019 ▲2▼ Distribution location Global Alliance Partner Co., Ltd. (68-4 Kamimyo-ji, Kamiji-cho, Okazaki City, Aichi Prefecture)

The present invention relates to an oil recovery device that separates the evaporative components, mainly light components, from the evaporative components that evaporate when plastic is heated, and then cools and recovers them as liquid oil.

There has been technology relating to oil recovery devices that heat plastic and pyrolyze it to separate the evaporating components, mainly light components, from the evaporating components that evaporate, and then cool and recover the oil as liquid. One example of such an oil recovery device is Patent Document 1. As shown in Figures 28 to 30 and their explanations, Patent Document 1 is a device that includes a pyrolysis tank 218, a distillation device 198, and recovery containers 219 to 222.

Japanese Patent Application Laid-Open No. 9-291288

However, conventional oil recovery devices of this type have become very large. For example, in the above-mentioned Patent Document 1, the pyrolysis tank 218 and the distillation device 198 are each heated separately, and separate heating equipment is required. In addition, a large number of recovery containers 219 to 222 are required for each separation area, and installation space is also required. For this reason, there has been a demand to share the configuration of the oil recovery device and make it smaller. In addition, the conventional device is too costly because it requires separate heating.
Therefore, the applicant filed a patent application for an oil recovery device that improves on these points on April 5, 2019 (Patent Application No. 2019-072445). This application relates to an oil recovery device that is a further improvement of the previous invention, the oil recovery device.

In order to achieve the above object, as means 1, an oil recovery device that separates evaporative components mainly consisting of light components from evaporative components that evaporate by heating plastics, cools them, and recovers them as liquid oil is provided with a raw material storage section that stores plastics as raw material, a heating means for heating the raw material storage section, a separation means for separating evaporative components mainly consisting of light components from evaporative components that evaporate by being heated by the heating means, a cooling means that is arranged downstream of the separation means and cools the separated evaporative components mainly consisting of light components, a recovery tank that is arranged downstream of the cooling means and recovers the liquid oil, and an incineration device that incinerates evaporative components that do not liquefy in the recovery tank.
This makes it possible to dispose of the evaporated components, mainly consisting of unnecessary light components that could not be fully recovered as oil, without discharging them directly into, for example, the atmosphere or water.

"Plastic" refers to plastics that are solid at room temperature and melt when heated. Examples include thermoplastics such as polypropylene, polyethylene, and polystyrene. These may be used alone or in mixtures. When waste plastic is used as the raw material, it is common for other substances besides plastic to be mixed in, but as these are heated and evaporated once, it is not necessary for only plastic to be contained in the raw material storage section. It is acceptable for some foreign matter to be mixed in with the plastic.
"Evaporated components" are gaseous components derived from plastics that evaporate when the plastic reaches its boiling point or is thermally decomposed by heating. Evaporation includes not only cases where plastics are melted and evaporated, but also cases where plastics are sublimated.
"Light fraction" refers to a group of substances derived from plastics that can exist in a liquid state at room temperature (approximately 18°C to 30°C) after thermal decomposition, and is a component that rises as an evaporated component downstream of the separation means. When the temperature is not sufficient, some of the light components may exist on the heavy fraction side. The composition of the substance group that makes up the light fraction also changes depending on the temperature setting in the separation means.
The phrase "evaporation components mainly consisting of light fractions" is used because the evaporation components cannot be clearly divided into light fractions and the rest, and the definition of light fractions is not unambiguous, and a cracked and purified product may be included in either the light fraction or the heavy fraction depending on the temperature range. Therefore, the part that is separated from the evaporation components by a separation means set at a certain temperature and cannot rise any further is regarded as a residue and is regarded as a heavy fraction.
The "raw material storage section" is preferably a container with at least a bottom and a wall for storing solid plastic, for example, a large kettle-shaped metal member. A double structure in which the container is surrounded by a housing is preferable, but this is not essential. The burner device is preferably capable of heating the container from the outside.

The "heating means" may be any means capable of melting the plastic in the raw material container to obtain the evaporated component, such as a heater that utilizes Joule heat, or a burner device that uses gas, oil, or coal as a heat source.
The "separation means" is a mechanism having a function of separating the evaporating components, mainly light components, from the evaporating components. It is sufficient if the means can promote liquefaction by removing the condensation heat of the heavy components, which have a relatively low heat of vaporization, from the evaporated evaporating components. For example, a resistor having a lower temperature than the evaporating components is disposed so as to collide with the evaporating components. One example is a metallic resistor having scattered holes as disclosed in the embodiment. The separation means may be disposed above the raw material storage section so as to be continuous with the raw material storage section, or may be disposed as a separate device separated from the raw material storage section and housed in a housing at a distance.
The "cooling means" is disposed downstream of the separation means, and the evaporating components, mainly light fractions, are preferably cooled by the cooling medium for as long as possible. The cooling medium is preferably water, which is inexpensive and safe, but is not limited to water, and refrigerants such as liquefied nitrogen or helium may also be used.
The "recovery tank" is preferably placed below the cooling means, since the evaporated components, mainly the light components liquefied by the cooling means, will fall into it. The recovery tank should be such that the state of the evaporated components, mainly the liquefied light components, can be visually observed. For example, a water tank made of transparent glass is preferable.

As a second means, the cooling means has a structure in which piping is provided for passing evaporative components, mainly light components, through a cooling medium in a cooling tank, and the piping is connected to the recovery tank arranged below the cooling means.
By guiding the evaporative component mainly made up of light components through the piping, it becomes easier to induce the evaporative component mainly made up of liquefied light components. In addition, since the evaporative component mainly made up of liquefied light components does not come into direct contact with the cooling medium, the evaporative component mainly made up of liquefied light components does not mix with the cooling medium.
As a third means, the cooling medium is water, and the cooling means is configured by disposing piping in water while the water is poured into the cooling tank.
Using water as a cooling medium is inexpensive, and is safe as no chemical reaction will occur even if it comes into contact with the evaporating components, mainly the liquefied light fraction. The piping should be made of a metal with good thermal conductivity, especially copper or a copper alloy. The shape of the piping should be a coiled cooling pipe shape, commonly called a "chiller," to increase the contact area with the water.

As a fourth means, the incineration device is adapted to suck in the non-liquefied evaporated components in the recovery tank by using an ascending air current generated by the heat of a heat source used for incinerating the non-liquefied evaporated components in the recovery tank.
As a result, the evaporative components that do not liquefy in the recovery tank are sucked into the incineration device and incinerated, eliminating the need to provide a device in the recovery tank for transporting the evaporative components that do not liquefy from the recovery tank to the incineration device.
As a fifth means, the non-liquefied evaporated components in the recovery tank are guided into the main body of the incineration device from below, and are incinerated by a heat source arranged above the position where they are guided.
Such an arrangement increases the suction force of the incinerator, and the non-liquefied vapor components are directed below the heat source, making them more likely to be incinerated.
The main body of the incineration apparatus is preferably configured to have a cylindrical outer shape, that is, a shape surrounded by walls, in order to generate an upward air current.
As the sixth means, the heating means is a heater that heats by Joule heat.
This is because a heater that uses Joule heat can result in a heating device that is lighter and more compact than a burner device that uses gas, oil, or coal as a heat source, for example.

In addition, as the seventh means, the separating means is a metal plate body having a plurality of holes formed therein and arranged at scattered points.
As a separation means, it is preferable to collide the vaporized evaporating component with a resistor having a lower temperature than the vaporized component. In the case of such a metal plate body, the vaporized evaporating component collides (comes into contact with) the plate body, some of which escapes upward through the holes, and some of which collides with the plate body and liquefies and falls. Generally, relatively heavy products with large molecular weights or products with low boiling points undergo a phase transition from a gaseous state to a liquid state and are unlikely to advance above the plate body. Furthermore, they liquefy and fall upon colliding with the metal plate body. It is preferable to use a plurality of metal plates, rather than a single plate, which are arranged in a scattered manner so that the holes formed do not overlap in the vertical direction.
As the means 8, the separating means is disposed at an upper position within the raw material container.
In other words, the separation means is not integrated with the raw material storage section, but is arranged at an upper position in the same space. This eliminates the need to arrange the separation means separately downstream of the raw material storage section, which contributes to making the entire system more compact. However, on the other hand, the separation means may of course be configured as a separate body from the raw material storage section.
The above-mentioned inventions of means 1 to 8 can be arbitrarily combined. Any component of the inventions of means 1 to 8 may be extracted and combined with another component.

According to the present invention, the evaporated components, mainly consisting of unnecessary light fractions that could not be fully recovered as oil, can be disposed of without being released directly into, for example, the atmosphere or water.

FIG. 2 is a front view of the oil recovery device according to the embodiment of the present invention. FIG. 2 is a cross-sectional front view of the distillation section of the oil recovery apparatus according to the same embodiment. FIG. 2 is a cross-sectional side view of the distillation section of the oil recovery apparatus of the same embodiment. FIG. 2 is a side cross-sectional view of the recovery and incineration section of the oil recovery device of the same embodiment. FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 4A is a plan view of a first separation plate, and FIG. 4B is a plan view of a second separation plate. FIG. 13 is an explanatory diagram illustrating the screw-on relationship between a nipple and a screw cap with respect to a socket of an insulation tower of a decomposition tank of an oil recovery device of the same embodiment.

An oil recovery apparatus according to an embodiment of the present invention will be described below with reference to the drawings. Note that illustrations of components not directly related to the structure of the oil recovery apparatus 1 are simplified or omitted. The oil recovery apparatus 1 is composed of a distillation section 2, a recovery and incineration section 3, and a control section 4.
First, the distillation section 2 will be described.
As shown in FIGS. 1 to 4, the distillation section 2 has a structure in which a heat-retaining tower 6 is installed in a housing 5, and a decomposition vessel 7 is housed in the heat-retaining tower 6.
The housing 5 is made of a metal (specifically, stainless steel alloy) plate-like member that has a rectangular parallelepiped appearance as a whole. The housing 5 is made of a square bottom 5a configured in a raised bed style, walls 5b surrounding the inside from all sides, and a lid 5c on the top. The lid 5c is removable. A through hole 8 is formed near the center of the lid 5c. Through holes 9 are formed at spaced apart positions above and below on one side of the wall 5b facing outward from the oil recovery device system.

The heat-retaining tower 6 is a metal (specifically, stainless steel alloy) container for the decomposition kettle 7. The heat-retaining tower 6 is configured in a cylindrical shape with a bottom and an open top, and a heat insulating material 10 is arranged along the inner peripheral surface 6a. The heat insulating material 10 has a thickness such that a gap S as a closed space is generated between the heat-retaining tower 6 and the decomposition kettle 7 when the decomposition kettle 7 is accommodated in the heat-retaining tower 6. A ring portion 11 is formed at the upper end of the heat-retaining tower 6, protruding inward from the outer wall. Therefore, a circular through hole 11a that matches the outer shape of the decomposition kettle 7 is formed in the upper part of the heat-retaining tower 6.
As shown in Figs. 2 and 4, through holes 12 are formed at upper and lower positions spaced apart from each other on the side surface of the heat retention tower 6, and sockets 13 having a diameter corresponding to the through holes 12 are formed to protrude outward at the positions of the through holes 12. As shown in Fig. 7, the sockets 13 are cylindrical members having female threads 13a formed on the inner circumferential surface. The sockets 13 are disposed at positions corresponding to the through holes 9 formed in the wall portion 5b of the housing 5, and the tip of the sockets 13 slightly protrudes outward from the through holes 9. A nipple 14 is screwed into the sockets 13 at the base end side on the decomposition kettle 7 side. The nipples 14 are cylindrical members having male threads 14a formed near one side of the outer periphery. The tip of the nipple 14 on the decomposition kettle 7 side is disposed at the gap S position around the decomposition kettle 7 through the heat insulating material 10. The gap S closed by the passage formed by the sockets 13 and the nipples 14 is communicated with the outside air.

As shown in Fig. 2 and Fig. 3, the decomposition vessel 7 made of metal (specifically, stainless steel alloy) as a raw material storage vessel is a bottomed sealed vessel having a cylindrical body wall 7a. The decomposition vessel 7 is placed on a bolt 24 erected from the bottom 5a of the housing 5, so that heat is not easily transferred to the floor side. When stored in the heat-retaining tower 6, the upper region of the decomposition vessel 7 is exposed upward from the heat-retaining tower 6. A flange 15 is formed around the entire periphery of the upper edge of the body wall 7a. A lid 16 having the same diameter as the flange 15 is placed on the flange 15. The flange 15 and the lid 16 are fastened together with an eyebolt 18 with a gasket 17 interposed between them, so that the lid 16 seals the upper opening. A through hole 19 is formed in the center of the lid 16. An evaporation component delivery pipe 20 is connected to the through hole 19. The evaporation component delivery pipe 20 guides the light components to the downstream cooling section 4.
As shown in Figures 3 and 5, an electric heater 22 is housed in the bottom plate 21 of the decomposition kettle 7. A plurality of (four in this embodiment) rod-shaped electric heaters 22 are inserted into the passages 21a in the bottom plate 21 so as to be spaced apart from one another, parallel to one another, and at the same height. A first temperature sensor 23 as a detection means is inserted into the passage 21a at a position between two electric heaters 22 closer to the center. The first temperature sensor 23 is a temperature sensor consisting of a thermocouple. The electric heater 22 and the first temperature sensor 23 are fixed to a holder 25 erected on the bottom 5a of the housing 5. The outer periphery of the bottom plate 21 is surrounded by a heat insulating member 26.

A reactor 27 is disposed at a position near the top of the decomposition vessel 7 as a separation means. The reactor 27 is a mechanism provided at a position where the evaporated components, mainly pyrolyzed, derived from the plastic raw material evaporated from the heated decomposition vessel 7 rise. As shown in FIG. 3, the reactor 27 is composed of two separation plates 28 and 29 arranged vertically and an upper area surrounded by the main body wall 7a of the decomposition vessel 7. As shown in FIG. 3 and FIG. 6(a) and (b), the separation plates 28 and 29 are copper plate members having a circular cap shape in a plan view, gradually lowering from the center to the periphery. The separation plates 28 and 29 each have a plurality of through holes 31 formed in communication with the front and back. The through holes 31 are holes through which the evaporated components pass when they rise.
The first separation plate 28 disposed on the upper side has one through hole 31 at the center and sixteen through holes 31 formed on the plate periphery arranged radially symmetrically from the center. The second separation plate 29 disposed on the lower side has one through hole 31 at the center and eight through holes 31 of the same size formed in a pattern different from that of the first separation plate 28 (i.e., so that the through holes 31 do not overlap in the vertical direction as much as possible), and eight more through holes 31 of the same size are formed outside them and arranged radially symmetrically from the center.
As shown in Fig. 3, the upper and lower separation plates 28, 29 are connected by two bent rods 32. A male screw (not shown) is formed on the outer periphery of the rod 32, which is inserted into any through hole 31 formed at an opposing position of the separation plates 28, 29 and is fixed by tightening nuts 33 arranged above and below the separation plates 28, 29. The separation plates 28, 29 are held at a predetermined distance from each other by the rods 32 and nuts 33. The separation plates 28, 29 are supported by placing the lower separation plate 29 on a rib 34 formed on the inner periphery of the main body wall 7a of the decomposition kiln 7.
As shown in Fig. 3, a second temperature sensor 35 for measuring the temperature inside the reactor 27 is disposed inside the reactor 27. The second temperature sensor 35 is a temperature sensor consisting of a thermocouple. The detection portion of the second temperature sensor 35 is introduced into the decomposition tank 7 through through holes 36, 37 formed in the heat retention tower 6 and the decomposition tank 7.

As shown in Figures 2 and 7, a screw cap 41 is provided at the tip of the socket 13 of the insulation tower 6 to close the through hole 12 when the oil recovery device 1 is in operation. The screw cap 41 has a grip portion 41a and a male thread 41b on the outer periphery of the body. The screw cap 41 is screwed with the male thread 41b into the female thread 13a of the socket 13 provided at the upper and lower through holes 12. An operator operates the grip portion 41a of the screw cap 41 to screw the male thread 41b into the female thread 13a on the socket 13 side and tighten it, thereby closing the socket 13, i.e., the through hole 12 communicating with the insulation tower 6.
When the heating distillation operation is completed and the next heating distillation operation is to be started, the screw cap 41 is removed and outside air is introduced into the space S in the heat retention tower 6 from the lower socket 13 (through hole 12) by a blower not shown in the figure to cool the decomposition tank 7.

Next, the recovery and incineration section 3 will be described.
1 and 4, a cooling/recovery device 46 and an incineration tower 47 are installed on a stand 45. The cooling/recovery device 46 is equipped with first and second cylindrical transparent glass water tanks 49, 50 arranged in two upper and lower stages supported by a rack 48. The first and second water tanks 49, 50 are supported by alloy plates 51A-51C arranged in three stages, which serve as the top and bottom plates of the water tanks 49, 50. The water tanks 49, 50 are fixed in grooves 52 formed in the plates 51A-51C via O-rings 52a so as to be watertight.
The first water tank 49, which serves as a cooling tank arranged on the upper side, is filled with cooling water, and an inlet pipe 53 and an outlet pipe 54 are arranged therein. The inlet pipe 53 is connected to the evaporated component delivery pipe 20. The inlet pipe 53 is equipped with a cooling pipe 55 wound in a coil shape made of copper. The cooling pipe 55 is wound in multiple stages with a gentle downward slope so that the evaporated components sent out from the evaporated component delivery pipe 20 flow downward when cooled and become liquid oil. The lower end (tip) of the inlet pipe 53 is connected to an outlet 56 formed in a plate 51B arranged at the middle position of the three stages, and the liquid oil drips from the outlet 56 into the second water tank 50, which serves as a recovery tank arranged below.
The outlet pipe 54 is connected to a discharge port 57 formed in the plate 51B, and extends outward from the plate 51A above the first water tank 49. The evaporated components that have not been liquefied in the second water tank 50 are discharged by the outlet pipe 54 through the first water tank 49 to the incineration tower 47.
A drain passage 58 and a drain cock 59 for discharging the liquid inside are provided in the plate 51B arranged in the middle position and the plate 51C arranged in the lower position.

As shown in FIG. 4, the incineration tower 47 is disposed at the rear of the cooling and recovery device 46 .
The incineration tower 47 is surrounded by a housing 61. The housing 61 is a cylinder with a rectangular outer shape, and is fitted with a top plate 62 having a net formed thereon as a ventilation section for discharging hot air.
The incineration tower 47 is equipped with a cylindrical stainless steel alloy body 63. A connector 64 is provided at the bottom of the body 63, and is connected to the end of the outlet pipe 54 extending from the cooling and recovery device 46 (part of the outlet pipe 53 is shown in simplified form by a dashed line in FIG. 4). A band heater 65 is provided at the top of the body 63 so as to surround it.

Next, the control unit 4 will be described.
The control unit 4 is composed of a first heating control device 71 that controls the electric heater 22 in the decomposition furnace 7 and a second heating control device 72 that controls the band heater 65 in the incineration tower 47. A main power supply device for supplying power to the first heating control device 71 and the second heating control device 72 is not shown in the figure.
The electric heater 22, the first temperature sensor 23, and the second temperature sensor 35 are connected to the first heating control device 71. The first operation panel 74 and the second operation panel 75 are provided in the first heating control device 71, and the temperature detected by the first temperature sensor 23 is displayed on the first operation panel 74, and the temperature detected by the second temperature sensor 35 is displayed on the second operation panel 75. In addition, the target temperature can be set by operating the first operation panel 74 and the second operation panel 75. The first heating control device 71 performs feedback control based on the temperature set on the operation panels 74 and 75, and executes feedback control to turn the electric heater 22 on and off based on the temperature set on the operation panels 74 and 75. Specifically, the electric heater 22 is turned on until the temperature is set on the work side (i.e., the reactor 27 side), and when the temperature is equal to or higher than the set temperature, the electric heater 22 is turned off. When the temperature is equal to or lower than the temperature set on the work side, the electric heater 22 is turned on again. Moreover, if the temperature exceeds the temperature set for the electric heater 22, overheating will occur, and therefore the electric heater 22 is controlled to be turned off.
The band heater 65 is connected to the second heating control device 72. The second heating control device 72 is provided with a temperature adjustment button 76. A heating temperature operation panel 77 is provided on the second heating control device 72.

In the oil recovery device 1 having the above-described configuration, the oil can be recovered from the plastic by, for example, performing the following operation.
The worker opens the lid 5c of the housing 5, and then opens the lid 16 of the internal decomposition vessel 7 to pour in the raw plastic. After the raw plastic is poured in, the lid 16 and the lid 5c of the housing 5 are closed again to return to the state shown in FIG.
Next, the operator operates the input switch 73 of the first heating control device 71 of the control unit 4 to start it up, and at the same time, the operator sets the heating temperature of the decomposition tank 7 and the temperature near the reactor 27 using the first temperature sensor 23 and the second temperature sensor 35 based on information based on experience.
When the electric heater 22 is turned on and the temperature rises over time (to about 100°C or higher), the raw plastic gradually begins to melt. As the temperature rises further, the raw plastic begins to thermally decompose (to about 200°C or higher). Thermal decomposition causes evaporated components to rise from the raw plastic. The upward force is not only due to the rising air current caused by heating, but also due to the pressure caused by the increase in air pressure inside the decomposition vessel 7, and the effect of the pressure caused by the increase in air pressure is particularly large after the evaporated components reach the evaporated component delivery pipe 20.
As the decomposition vessel 7 is heated, the temperature in the reactor 27 in the decomposition vessel 7 also rises. Feedback control is performed by the first heating control device 71 so that the temperature in the vicinity of the reactor 27 is always kept at a desired temperature (for example, 400° C.).
The evaporated components that reach the reactor 27 come into contact with the separation plates 28, 29, so that products that are relatively heavy and have a large molecular weight or a high boiling point undergo a phase transition from a gaseous state to a liquid state and are unable to proceed above the reactor 27. Therefore, the evaporated components that have proceeded downstream from the reactor 27 are discharged as light fractions from the evaporated component delivery pipe 20 to the cooling and recovery device 46 side.

Next, the recovery and incineration section 3 will be described.
As shown in Figures 1 and 4, a cooling and recovery device 46 and an incineration tower 47 are installed on a stand 45. The cooling and recovery device 46 is equipped with a cylindrical transparent glass water tank 49 and an oil recovery tank 50 arranged in two upper and lower stages supported by a rack 48. The water tank 49 and the oil recovery tank 50 are supported by alloy plates 51A to 51C arranged in three stages, which serve as the top and bottom plates of the water tank 49 and the oil recovery tank 50. The water tank 49 and the oil recovery tank 50 are fixed in grooves 52 formed in the plates 51A to 51C via O-rings 52a so as to be watertight.
The water tank 49, which serves as a cooling tank arranged on the upper side, is filled with cooling water, and an inlet pipe 53 and an outlet pipe 54 are arranged therein. The inlet pipe 53 is connected to the evaporated component delivery pipe 20. The inlet pipe 53 is equipped with a cooling pipe 55 wound in a coil shape made of copper. The cooling pipe 55 is wound in multiple stages with a gentle downward slope so that the evaporated components sent out from the evaporated component delivery pipe 20 flow downward when cooled and become liquid oil. The lower end (tip) of the inlet pipe 53 is connected to an outlet 56 formed in a plate 51B arranged at the middle position of the three stages, and the liquid oil drips from the outlet 56 into the oil recovery tank 50 arranged below.
The outlet pipe 54 is connected to a discharge port 57 formed in the plate 51B, and extends outward from the plate 51A above the water tank 49. The evaporated components that are not liquefied in the oil recovery tank 50 are discharged to the incineration tower 47 via the outlet pipe 54 and the water tank 49.
A drain passage 58 and a drain cock 59 for discharging the liquid inside are provided in the plate 51B arranged in the middle position and the plate 51C arranged in the lower position.

As described above, the configuration of this embodiment provides the following effects.
(1) Since the decomposition vessel 7 is heated by the electric heater 22 disposed below, an external heating means such as a burner is not required, and the device can be made extremely small, lightweight, and low-cost. In addition, since the reactor 27 is located inside the decomposition vessel 7, there is no need to enclose the reactor 27 in a case, which also contributes to the reduction in size, weight, and cost.
(2) When recovering liquid oil, the remaining evaporated components that do not liquefy can be treated by absorbing them in water, but in that case, a separate water tank must be prepared, and the waste liquid must be treated as industrial waste. However, by incinerating the oil in the incineration tower 47, the need for such equipment and treatment is eliminated, which also contributes to the reduction in size, weight, and cost.
(3) When the non-liquefied evaporative components are guided from the oil recovery tank 50 to the incineration tower 47 for incineration, the air in the oil recovery tank 50 is pulled by the ascending air current from the incineration tower 47 side, and at the same time, the air in the oil recovery tank 50 is pushed by the pressing force from the decomposition tank 7. Therefore, the non-liquefied evaporative components can be guided to the incineration tower 47 without the need for a special device such as a pump.
(4) In the operation of recovering liquid oil in the decomposition tank 7, when the evaporated components are separated into light and heavy components in the reactor 27, the temperature of the electric heater 22 can be adjusted while checking the temperatures both near the reactor 27 and near the electric heater 22, so that the optimal conditions for the reactor 27 can always be accurately determined.
(5) Since the water tank 49 and the oil recovery tank 50 are arranged in two stages, one above the other, the oil liquefied in the water tank 49 naturally accumulates in the lower oil recovery tank 50, which contributes to making the cooling and recovery device 46 more compact.
(6) The reactor 27 only separates the evaporated components into light and heavy components, so there is no need to make it long and long in the vertical direction. In addition, there is no need to separate only two components into several fine separation zones.
(7) The inside of the reactor 27 consists of only two separation plates 28, 29 suspended from the rods 32, so that it is easy to remove and clean.
(8) The decomposition furnace 7 is kept warm by the heat-retaining tower 6, while the area around the heat-retaining tower 6 is insulated from the heat of the decomposition furnace 7 and is also insulated, so that the housing 5 does not become too hot.

The above embodiment is merely described as a specific embodiment for illustrating the principle and concept of the present invention. In other words, the present invention is not limited to the above embodiment. The present invention can be embodied in the following modified forms, for example.
The specific configurations of the oil recovery device 1, such as the decomposition tank 7, the cooling and recovery device 46, the incineration tower 47, etc., are merely examples and may be configured in other ways.
Materials other than those mentioned above may be used. For example, the decomposition vessel 7 and the heat retention tower 6 may be made of metals other than those mentioned above. For example, the separation plates 28 and 29 constituting the reactor 27 may also be made of metals other than those mentioned above.
In the above embodiment, the heat retention tower 6 in which the decomposition kettle 7 is housed is disposed inside the housing 5, but the present invention can be implemented without the housing 5. Also, the present invention can be implemented without the heat retention tower 6 if the housing 5 is present. If the heat retention tower 6 is not present, it is possible to provide a heat insulating material inside the housing 5, or to construct the housing 5 itself from a non-flammable heat insulating material (e.g., lightweight aerated concrete, etc.).
In the above description, the upper and lower water tanks 49 and the oil recovery tank 50 are made of transparent glass. Therefore, the state of the liquid inside can be visually observed, but at least the water tank 49 does not have to be transparent. The water tanks may also be made of a transparent material other than glass, such as acrylic resin.
In the above embodiment, the first heating control device 71 performs feedback control, but other methods may be used, for example, an operator may visually check the temperature obtained by the sensor and adjust the heating temperature as appropriate. The second heating control device 72 may also be performed by feedback control.
In applying the present invention, the reactor 25 may be separated from the heating portion, as in, for example, Japanese Patent Application No. 2019-072445.

The present invention is not limited to the configurations described in the above-mentioned embodiments. The components of each of the above-mentioned embodiments and modifications may be arbitrarily selected and combined. Any component of each of the embodiments and modifications may be arbitrarily combined with any component described in the Summary of the Invention or any component that embodies any component described in the Summary of the Invention. We intend to obtain rights to these as well through amendments to this application or divisional applications, etc.
In addition, the applicant intends to obtain rights to the overall design or partial design by filing a conversion application to a design application. The drawings show the entire device in solid lines, but they also include partial designs claimed for a portion of the device as well as the overall design. For example, not only can a portion of the device be a partial design, but a portion of the device can also be included as a partial design regardless of the portion. A portion of the device may be a portion of the device, or a part of that portion.

1...oil recovery device, 7...decomposition tank as raw material storage section, 22...electric heater as heating means, 16...exhaust duct, 27...reactor as separation means, 47...incinerator as incineration device, 49...water tank as part of cooling means, 50...oil recovery tank as recovery tank, 55...cooling pipe as part of cooling means.

Claims (7)

In an oil recovery device, a plastic is heated to separate light components from the evaporated components, which are then cooled and recovered as liquid oil.
a raw material storage section for storing plastic as a raw material;
A heating means for heating the raw material storage section;
A separation means for separating an evaporation component mainly composed of light components from the evaporation components heated and evaporated by the heating means;
A cooling means is disposed downstream of the separation means and cools the separated evaporated components mainly including light fractions;
a recovery tank disposed downstream of the cooling means and configured to recover the liquid oil;
an incineration device for incinerating the non-liquefied evaporated components in the recovery tank;
The oil recovery device is characterized in that the separation means is composed of a metal plate body arranged at intervals above and below, with a plurality of holes arranged in a scattered manner and gradually tapering from the center to the periphery . The oil recovery device according to claim 1, characterized in that the cooling means has a structure in which piping is arranged to pass evaporating components, mainly light components, through the cooling medium in the cooling tank, and the piping is connected to the recovery tank arranged below the cooling means. The oil recovery device according to claim 2, characterized in that the cooling medium is water, and the cooling means is configured by disposing piping underwater while water is poured into the cooling tank. The oil recovery device according to any one of claims 1 to 3, characterized in that the incineration device uses an ascending air current generated by the heat of a heat source used to incinerate the non-liquefied evaporated components in the recovery tank. The oil recovery device according to claim 4, characterized in that the non-liquefied evaporated components in the recovery tank are led into the main body of the incineration device from below, and incinerated by a heat source arranged above the lead position. The oil recovery device according to any one of claims 1 to 5, characterized in that the heating means is a heater that heats by Joule heat. An oil recovery device according to any one of claims 1 to 6, characterized in that the separation means is disposed at an upper position within the raw material storage section.

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