JP3925334B2 - Metal composite plastic waste separation equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a mixture of metal composite plastic waste, especially plastics, fibers, metals, glass, etc., such as shredder dust generated from waste automobiles, waste home appliances, waste OA equipment, etc. It is possible to quickly and easily separate or reduce the volume of metal composite plastic waste. Organic components such as plastic recovered by separation can be used as raw fuel for furnaces such as blast furnaces, and ferrous and nonferrous metals can be separated from ferrous and nonferrous metals. The present invention relates to a metal composite plastic waste separation facility that can be used as a raw material.
[0002]
[Prior art]
In recent years, plastics and other synthetic resins have been increasing as industrial waste and general waste, and the treatment has become a serious problem socially and environmentally. In particular, plastics, which are polymeric hydrocarbon compounds, generate a large amount of heat during combustion, and there are problems such as damaging the furnace wall of the incinerator when incinerated. Therefore, in order to require incineration equipment dedicated to plastics, most of them are not disposed of by incineration but are disposed of in landfills.
[0003]
However, the dumping of plastic or the like brings about a decrease in the landfill of the landfill site and is not preferable from the viewpoint of environmental measures. Furthermore, recently, with an increase in processing costs, a shortage of land for landfills is becoming a social problem. For this reason, development of a method capable of treating a large amount of synthetic resins without discarding them is eagerly desired and studied in various fields.
[0004]
As a general method for treating metal composite plastic waste, there is a method of separating synthetic resins such as plastic and other inorganic components using a vertical separation tank. This vertical separation tank device is a waste separation facility that puts metal composite plastic waste from the upper part of the vertical separation tank, separates it into suspended matter and sediment by the heat transfer oil in the tank, and carries it out and collects it. Yes, the metal composite plastic waste is separated in specific gravity by dipping and dropping in the heat medium bath stored in the separation tank, the plastic part floats in the heat medium bath, the inorganic part settles, And each is collected.
[0005]
In the above method, contact with a heated heating medium is important in order to separate the plastic and inorganic components from the metal composite plastic waste, and in order to increase the throughput in the conventional vertical separation tank In addition, it is necessary to ensure a sufficient residence time for separating the metal composite plastic waste, and the metal composite plastic waste must be moved (dropped) at an extremely low speed. However, for example, the decomposition of urethane, which has been carried out by the present inventor and has a low bulk specific gravity and hardly floats on the surface of the heating medium, requires a residence time of 30 minutes or more, and this moving speed ( It is difficult to manage the heat medium and the flow of metal composite plastic waste), and separation and recovery cannot be sufficiently performed, resulting in poor separation efficiency.
[0006]
In addition, since the metal composite plastic waste is thrown into the separation tank by natural dropping, light objects are likely to accumulate in the dungeon, soaked non-uniformly and decomposed. Furthermore, when the scale-up is performed, the inner diameter of the separation tank may be increased. However, when the heat compensation in the separation tank is performed from the outer wall of the separation tank, the heat transfer surface is only the outer wall, and the temperature distribution in the inner diameter direction of the separation tank. And the separation efficiency of the metal composite plastic waste is different between the outer wall of the separation tank and the center. And when it is supposed to scale up such a vertical separation tank until an industrial process can be performed, installation cost starts, and a vertical separation tank is not practical.
[0007]
In order to solve the above-mentioned problems, Japanese Patent Laid-Open No. 2001-179213 discloses that a column weir is installed at the center of a vertical cylindrical separation tank, and the heat transfer oil and metal composite plastic waste are swirled around it. An apparatus for recovering suspended matter and sediment is disclosed. FIG. 5 is a diagram showing an example of a conventional vertical separator. As shown in FIG. 5, the dissolution / separation equipment 110 is provided with a pillar weir 112 at the center of the upper part of the dissolution / separation tank 111, and the S / D supply device 113 and the introduced S / D are heated by the heat transfer oil 117. A swirler (not shown) that swirls around 112 and a carry-out / recovery device 116 that carries out and collects the suspended matter 123 generated by dissolution, separation, and volume reduction are provided.
[0008]
Japanese Patent Application Laid-Open No. 2001-181441 discloses a column weir installed in the center of a vertical cylindrical separation tank, and around the suspended matter and sedimentation by rotating heat transfer oil and metal composite plastic waste around it. In a method for recovering an object, a method is disclosed in which heat is applied to discharged heat transfer oil and the heat transfer oil is circulated and supplied.
[0009]
[Problems to be solved by the invention]
However, in the technique disclosed in Japanese Patent Application Laid-Open No. 2001-179213, rake is used in the sediment recovery method, so that there is a problem that long wires such as wires in the metal composite plastic waste are entangled.
Further, the technique disclosed in Japanese Patent Application Laid-Open No. 2001-181441 has a problem in that when the amount of processing increases, it accumulates and causes shelves and the like.
In view of the above situation, an object of the present invention is to provide a metal composite plastic waste separation facility that can solve the above-described problems and can efficiently separate a plastic and an inorganic material.
[0010]
[Means for Solving the Problems]
As a result of studies to solve the above problems, the present inventors have obtained the following knowledge.
Even if it is attempted to increase the separation efficiency using a conventional vertical separation tank, the separation is performed based on the natural fall of waste, and thus the efficiency does not increase in proportion to the height.
[0011]
By using a horizontal type separation tank and moving the metal composite plastic waste using the flow of the heat medium, the metal composite plastic waste naturally falls and flows through the tank without sinking to the bottom. Move sideways along. Therefore, the contact time of the heat medium with the metal composite plastic waste can be increased, and the separation efficiency is increased. Furthermore, it is easy to control the residence time, and the appropriately adjusted heating medium supply rate is directly reflected in the separation efficiency. Further, the temperature non-uniformity is eliminated, and the separation efficiency non-uniformity is eliminated. Further, when waste or the like accumulates in the bottom of the separation tank, a push-in function is added by providing a rotating weir to prevent reduction in separation efficiency due to accumulation of waste or the like. By providing the rotary weir, it is possible to control the residence time quantitatively.
[0012]
The present invention has been made based on the above findings and has the following configuration.
A first aspect of the metal composite plastic waste separation facility according to the present invention is a horizontal separation tank in which a heat medium is stored and the metal composite plastic waste is separated by being immersed in the heat medium, and one of the horizontal separation tanks A waste supply device that is provided at an end of the horizontal separation tank and supplies the waste to the horizontal separation tank, and a heating medium supply device that is provided at the one end of the horizontal separation tank and supplies a heat medium to the horizontal separation tank A first recovery device for recovering the floating product of the composite plastic waste provided at the upper part of the other end of the horizontal separation tank; and the composite plastic waste provided at the lower part of the other end of the horizontal separation tank. This is a metal composite plastic waste separation facility comprising a second recovery device for recovering the sediment and a heat medium discharge device provided at the upper part of the other end of the horizontal separation tank.
[0013]
According to a second aspect of the metal composite plastic waste separation facility of the present invention, the metal composite plastic waste separation is further provided with a rotary weir device that immerses the waste in the heat medium in the horizontal separation tank. Equipment.
[0014]
According to a third aspect of the metal composite plastic waste separation facility of the present invention, in the horizontal separation tank, the metal composite plastic is immersed in the heat medium in a temperature range of 150 ° C. to 350 ° C. This is a plastic waste separation facility.
[0015]
A fourth aspect of the metal composite plastic waste separation facility of the present invention further includes a heat medium circulation tank connected to the heat medium supply device and the heat medium discharge device, respectively, for supplying and refining the heat medium. It is a separation facility for metal composite plastic waste.
[0016]
According to a fifth aspect of the metal composite plastic waste separation facility of the present invention, the metal further includes a first cooling device connected to the first recovery device and configured to cool the floated metal composite plastic waste. Complex plastic waste separation facility.
[0017]
According to a sixth aspect of the metal composite plastic waste separation facility of the present invention, the metal further includes a second cooling device connected to the second recovery device and configured to cool the sediment of the metal composite plastic waste. Complex plastic waste separation facility.
[0018]
According to a seventh aspect of the metal composite plastic waste separation facility of the present invention, the sediment recovery is provided in the horizontal separation tank and moves the metal composite plastic waste sediment toward the second recovery device. This is a metal composite plastic waste separation facility, further comprising a scraper.
[0019]
An eighth aspect of the metal composite plastic waste separation facility according to the present invention is a metal composite plastic waste separation facility in which the first recovery device is formed of a levitated material scraper.
[0020]
A ninth aspect of the metal composite plastic waste separation facility according to the present invention is a metal composite plastic waste separation facility further comprising an exhaust gas treatment device connected to the horizontal separation tank.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the separation facility for metal composite plastic waste according to the present invention will be described in detail with reference to the drawings.
The separation facility for metal composite plastic waste according to the present invention includes a horizontal separation tank in which a heat medium is stored and the metal composite plastic waste is immersed and separated in the heat medium, and a metal provided at one end of the horizontal separation tank. Waste supply device that supplies composite plastic waste to the horizontal separation tank, a heat medium supply device that is provided at one end of the horizontal separation tank and supplies a heat medium to the horizontal separation layer, and the other end of the horizontal separation tank A first recovery device for recovering levitated material of the metal composite plastic provided at the upper portion of the metal, and a second recovery device for recovering sediment of the metal composite plastic waste provided at the lower portion of the other end of the horizontal separation tank; A metal composite plastic waste separation facility comprising a heat medium discharge device provided at the upper part of the other end of the horizontal separation tank.
[0022]
Further, in the separation tank described above, a rotary weir device is further provided for immersing the metal composite plastic waste in the heat medium. Furthermore, in the separation tank described above, the immersion temperature of the metal composite plastic by the heat medium is in the range of 150 ° C. to 350 ° C. Furthermore, it is further connected to a heat medium supply device and a heat medium discharge device, respectively, and further includes a heat medium circulation tank for supplying and refining the heat medium. Furthermore, the 1st cooling device connected to the 1st collection | recovery apparatus and cooling the floating material of a metal composite plastic metal composite plastic waste is further provided. In addition, a second cooling device connected to the second recovery device for cooling the sediment of the metal composite plastic waste is further provided.
[0023]
Furthermore, the metal composite plastic waste separation facility of the present invention further includes a sediment recovery scraper that is provided in the separation tank and moves the metal composite plastic waste sediment toward the second recovery device. . Further, the first recovery device is a floating object recovery scraper. Furthermore, an exhaust gas treatment device provided in connection with the separation tank is further provided.
[0024]
In the present invention, the horizontal separation tank is a movement mode of the stored heat medium, that is, a tank in which the flow direction of the heat medium is a horizontal direction, and has, for example, a horizontal and vertical length of the separation tank. The separation tank satisfies a ratio of 1 ≧ horizontal / vertical, and the shape of the separation tank is not particularly limited. The shape may be, for example, a cylinder or a prism, and any metal composite plastic waste that is an object to be processed can be separated and recovered along the flow of the heat medium.
[0025]
FIG. 1 is a side sectional view showing one embodiment of a metal composite plastic waste separation facility according to the present invention. FIG. 2 is a partially enlarged view thereof. FIG. 3 is a plan view of a part of the metal composite plastic waste separation facility of the present invention. Hereinafter, the acronym of shredder dust, which is a typical example of metal composite plastic waste, is referred to as S / D.
As shown in FIG. 1, the metal composite plastic waste (S / D) separation facility of the present invention includes an S / D separation tank 1 and an S / D input device 8a provided at one end of the separation tank 1. 8b, a rotary weir 5 provided inside the separation tank 1, a floating material collection device (ie, a first collection device) 3 disposed at the other end of the separation tank, and one end from the bottom of the separation tank 1 to the other end. A sediment recovery device (that is, a second recovery device) 4 is provided. Further, from the S / D storage tank 11 to the S / D supply device 12, the supply conveyor 13, the heat medium circulation tank 2 for heat supply and purification of the heat medium, the purification device 18, and the exhaust gas heat medium removal device 14 The exhaust gas treatment device 16 and the cooling and recovery devices 9 and 10 for the levitated matter and the sediment are attached.
[0026]
The separation tank 1 has a horizontal cylindrical shape (for example, an inner diameter of 4 m and a length of 14 m), and a heat medium (also referred to as heat transfer oil) is supplied from one end side of the cylinder where the S / D inlet is disposed. It is structured such that it is sprayed to the upper surface of the input S / D toward the other end side and discharged from the other end side 17 of the separation tank. Therefore, S / D is separated while moving in the same direction as the flow of the heat medium, and discharged from the other end of the separation tank. As a result, the contact area between the metal composite plastic waste and the surface of the heat medium is ensured, the separation tank 1 is formed into a horizontal cylinder, and the supply rate of the heat medium is adjusted, so that the separation required for the separation of S / D A sufficient residence time in the tank can be provided. Furthermore, temperature non-uniformity is eliminated, and non-uniformity in the separation tank is eliminated.
[0027]
It is also possible to arbitrarily and quantitatively control the residence time in the separation tank by installing the rotary weir 5 in the separation tank 1 and adjusting the rotation speed, and various metal composite plastic wastes Can be handled.
By disposing the sediment recovery device 4 from one end to the other end of the lower part of the separation tank 1 as shown in the present invention, the unseparated S / D having a higher specific gravity than that of the heat transfer oil is promptly generated after the S / D is charged. In the case of sedimentation, the sediment scraper can be continuously separated and recovered by changing the sediment scraper to a speed necessary for separation.
[0028]
A scraper conveyor is used for each of the recovery devices 6 and 7, but the present invention is not limited to this. For example, the generated plastic floating material such as a screw conveyor, or a sediment with heavy specific gravity is continuously used. Any device that can be taken out of the system can be used.
The float cooling device 9 and the sediment cooling device 10 may be an indirect cooling method such as a steel belt cooler that is normally used, but is not limited thereto, and may be a direct water cooling method.
[0029]
The arrangement of the levitated material collection device and the sediment collection device should be such that they do not interfere with each other. For example, if the sediment collection device is parallel to the separation tank, the levitated material collection device may not be parallel to the separation tank. When the sediment recovery device is used as a base point, the float collection port may be installed at the S / D input port of the separation tank at an angle of 0 to 120 degrees.
[0030]
The exhaust gas heat medium removal device 14 may be an oil scrubber or an electric dust collector using the heat medium to be used, and may be any device that can sufficiently remove the heat medium from the exhaust gas.
The inside of the separation tank 1 and the heat medium circulation tank 2 is basically an oxygen-free atmosphere. In addition, an inert gas such as nitrogen can be ventilated for each device in order to shut off the outside air.
[0031]
As the heat medium (oil), coal tar heavy oil, pitch, coal liquefied oil, petroleum-based vacuum residual oil from certain oil types (those with a large amount of aromatic components such as kaffji), ethylene bottom oil, reformed oil And FCC oil. The S / D immersion temperature with the heat medium (oil) is 150 to 350 ° C., preferably 250 to 300 ° C.
[0032]
FIG. 4 is a side sectional view showing another embodiment of the metal composite plastic waste separating apparatus of the present invention. The S / D is charged into the separation tank 1, and the separated levitated matter is recovered out of the system by the levitated material collecting scraper 6. In the separation tank, the S / D is separated into a plastic-based float and an inorganic-based sediment, but a part of the separated float is decomposed to generate light hydrocarbons such as methane. These generated gases are discharged out of the system as exhaust gas, but when the separation tank and the outside air are insufficiently sealed, the air in the outside air enters the separation tank. Therefore, in order to prevent the outside air from entering the separation tank and the leakage of the gas generated in the separation tank to the outside air, as shown in FIG. 4, after the S / D charging device and the levitated material recovery scraper, the rotary Valves 33a and 33b are installed.
[0033]
The rotary valves 33a and 33b installed after the S / D charging device and the levitated material recovery scraper are not limited to the rotary valves, and may be those capable of maintaining airtightness, for example, valve dampers. Moreover, you may install an apparatus similarly after a sediment collection | recovery scraper. Furthermore, in consideration of the case where air enters, an inert gas such as nitrogen may be vented into the charging device, and the oxygen concentration in the exhaust gas is measured so that the generated gas does not explode. A device for automatically supplying nitrogen may be provided.
[0034]
Next, based on FIG. 1, an operation method using the metal composite plastic waste separation facility of the present invention will be described.
As shown in FIG. 1, the S / D stored in the S / D storage tank 11 is continuously cut out by the S / D supply device 12 and separated by the supply conveyor 13 via the input devices 8a and 8b. It is thrown into. S / D falls on the surface of the heat medium stored in the separation tank 1, and at the same time, the heat medium supplied from the heat medium oil supply system 20 is applied to the upper surface side of the S / D. The metal composite plastic component having a specific gravity smaller than the specific gravity of the heat medium is levitated by the rotary weir 5 being pushed down into the heat medium by the rotary weir 5 and immersed in the heat medium. Move toward the other end of the separation tank.
[0035]
The metal composite plastic component having a specific gravity greater than that of the heat medium contained in the S / D settles toward the lower part of the separation tank, and moves toward the other end of the separation tank by the sediment collecting scraper 7. The floating and settled metal composite plastic component moving toward the other end of the separation tank has a sufficient contact area with the heat medium, and a sufficient residence time (movement time) is maintained in the separation tank. It is separated into organic components such as iron and inorganic components such as non-ferrous iron, continuously scraped by scrapers 6 and 7, and recovered outside the system. The floating material such as plastic is cooled in a cooling device (namely, first cooling device) 9, and inorganic components such as ferrous non-ferrous metal are cooled and collected in a sediment cooling device (namely, second cooling device) 10.
[0036]
On the other hand, the heat medium discharged from the separation tank 1 is returned to the heat medium circulation tank 2 by the heat medium (oil) discharge device 17. A part of the heating medium returned to the heating medium circulation tank 2 is supplied to the heating medium purification apparatus 18 and after impurities such as fine inorganic particles are removed, the heating medium is returned to the heating medium circulation tank 2 and again separated. 1 is supplied. The exhaust gas discharged from the separation tank 1, the charging devices 8a and 8b, and the heat medium (oil) discharge device is sent to the heat medium removal device 14 in the exhaust gas through the exhaust gas pipes 22a, 22b, 22c, 22d, and 22e. After being removed, it is sent to the exhaust gas treatment device 16 via the exhaust gas combustion furnace 15 and rendered harmless.
[0037]
According to the present invention, the S / D supplied to the S / D separation tank is controlled by the flow of the heat transfer oil, and further by the rotating weir, so that the residence time is controlled (quantitative and continuous long residence time is secured), heat The contact area with the surface of the medium can be secured, and it can be sufficiently decomposed to reliably separate the levitated matter and the sediment.
[0038]
【The invention's effect】
As described above, in the present invention, the separation tank is a horizontal type, S / D is continuously supplied, and heat medium oil is injected into the upper surface side of the S / D, and the S / D is further immersed. With a simple structure in which the residence time can be adjusted by the weir, it is possible to reliably and efficiently separate an organic substance such as a plastic having a low specific gravity and an inorganic material such as a metal having a high specific gravity. Moreover, since it settles along the outer wall of a separation tank, the tangle of long things, such as electric wires, can be prevented. In order to increase the processing amount, it is only necessary to extend in the horizontal direction of the tank, so that the scale-up is easy and practical.
In addition, the metal composite plastic waste is separated while moving in the same direction as the flow of the heat medium by installing the levitated material and sediment collection device at the other end of the separation tank opposite to the S / D input port. Waste and sediment can be efficiently recovered.
Therefore, according to the present invention, it is possible to provide a metal composite plastic waste separation facility capable of efficiently separating a plastic and an inorganic material.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing one embodiment of a metal composite plastic waste separation facility according to the present invention.
FIG. 2 is a partially enlarged view of the metal composite plastic waste separation facility according to the present invention.
FIG. 3 is a plan view of a part of the metal composite plastic waste separation facility of the present invention.
FIG. 4 is a side sectional view showing another embodiment of the metal composite plastic waste separating apparatus of the present invention.
FIG. 5 is a diagram showing an example of a vertical separation apparatus directly used in a conventional method for separating and recovering waste materials such as plastics.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Separation tank 2 Heat medium circulation tank 3 Floating matter collection device 4 Sediment collection device 5 Rotating weir 6 Floating matter recovery scraper 7 Sediment collection scraper 8 S / D input device 9 Floating matter cooling device 10 Sediment cooling device 11 S / D storage tank 12 S / D supply device 13 Supply conveyor 14 Exhaust gas heat medium removal device 15 Exhaust gas combustion furnace 16 Exhaust gas treatment device 17 Heat medium discharge device 18 Heat medium purification device 19a, 19b Heat medium oil pump 20 Heat medium oil Supply system 21 Heat medium oil discharge system 22a, 22b, 22c, 22d, 22e Exhaust gas pipe 23 Heat medium oil return pipe 24 Exhaust gas floor 25 Processing vessel 26 Heating device 27, 28 Discharge conveyor 29 Molten salt 30 Plastic waste 31 Plastic material 32a, 32b Recovery box 33a, 33b Rotary valve

Claims (9)

A horizontal separation tank in the shape of a prism or cylinder , in which a heat medium flowing at a predetermined adjustable speed is stored, and metal composite plastic waste is immersed in the heat medium and separated while being moved by the flow of the heat medium ; A waste supply device that is provided at one end of the horizontal separation tank and supplies the waste to the horizontal separation tank; and a heat supply device that is provided at the one end of the horizontal separation tank and adjusts the supply speed. A heating medium supply device for supplying a medium to the horizontal separation tank, a first recovery device for recovering the floating product of the composite plastic waste provided on the other end of the horizontal separation tank, and Metal composite plastic comprising a second recovery device for recovering the sediment of the composite plastic waste provided at the lower part of the other end, and a heat medium discharging device provided at the upper part of the other end of the horizontal separation tank Waste separation equipment. The metal composite plastic waste separation facility according to claim 1, further comprising a rotary weir device capable of adjusting a rotational speed in which the waste is immersed in the heat medium in the horizontal separation tank. The metal composite plastic waste separation facility according to claim 1 or 2, wherein an immersion temperature of the metal composite plastic by the heat medium is within a range of 150 ° C to 350 ° C in the horizontal separation tank. 4. The metal composite according to claim 1, further comprising a heat medium circulation tank connected to the heat medium supply device and the heat medium discharge device, respectively, for performing heat supply and purification of the heat medium. Plastic waste separation equipment. 5. The metal composite plastic waste according to claim 1, further comprising a first cooling device that is connected to the first recovery device and cools the levitated material of the metal composite plastic waste. Separation equipment. The metal composite plastic waste according to any one of claims 1 to 5, further comprising a second cooling device connected to the second recovery device to cool the sediment of the metal composite plastic waste. Separation equipment. 7. The sediment recovery scraper provided in the horizontal separation tank and moving the metal composite plastic waste sediment toward the second recovery device. 8. Equipment for separating metal composite plastic waste as described in 1. The metal composite plastic waste separation facility according to any one of claims 1 to 7, wherein the first recovery device is a floating material recovery scraper. The metal composite plastic waste separation facility according to any one of claims 1 to 8, further comprising an exhaust gas treatment device provided in connection with the horizontal separation tank.

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