JP2005058980A - Method for reducing heating medium consumption in separate equipment of metal compound plastic waste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for reducing a heating medium consumption in separating equipment of metal compound plastic waste. <P>SOLUTION: The subject method for reducing the heating medium consumption in the separating equipment of the metal compound plastic waste, in which the metal compound plastic waste is immersed in a separation tank where the heating medium is contained, and is separated into the metal and plastics, is characterized in that a surfacing substance scraper 1 dipping up surfacing substances in the separation tank has an angle of inclination θ in the range of 30 to 60°. The method for reducing the heating medium consumption in the separating equipment of the metal compound plastic waste, in which the metal compound plastic waste is immersed in the separation tank where the heating medium is contained, and is separated into the metal and plastics, is characterized in that the surfacing substance scraper 1 dipping up the surfacing substances is warmed to reduce the viscosity of the heating medium and separate the heating medium from the scraper 1 and the surfacing substances. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, various kinds of materials such as plastics, fibers, metals, glass and the like, such as shredder dust generated from metal composite plastic waste, particularly waste automobiles, waste home appliances, waste OA equipment, etc. are mixed. 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 are used as raw materials for furnaces such as blast furnaces. The present invention relates to a heat medium consumption reduction method in a metal composite plastic waste separation facility that can be used as a non-ferrous raw material.

  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.

  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.

  One example of a metal composite plastic waste separation facility that can efficiently separate plastics and inorganic materials is one that uses a horizontal separation tank (see, for example, Patent Document 1).

  The horizontal separation tank is used in this way. Even if it is intended to increase the separation efficiency in the vertical separation tank, the separation is performed based on the natural fall of waste, so the efficiency does not increase in proportion to the height. This is because of the disadvantages.

  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. For this reason, the contact time of the heat medium with the metal composite plastic waste is 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.

  As shown in FIG. 6, this metal composite plastic waste separation facility includes a metal composite plastic separation tank 21, metal composite plastic input devices 22 a and 22 b provided at one end of the separation tank 21, and a separation tank 21. Rotation weir 23 provided in the interior of the tank, a floating material recovery device (that is, a first recovery device) 24 disposed at the other end of the separation tank 21, and a sedimentation provided from one end to the other end of the lower part of the separation tank 21. An object recovery device (that is, a second recovery device) 25 is provided. Further, the metal composite plastic storage tank 26 to the metal composite plastic supply device 27, the supply conveyor 28, the heat medium circulation tank 29 for the heat supply and purification of the heat medium, the purification device 30, and the exhaust gas heat medium removal device 31 are provided. Further, an exhaust gas treatment device 32 and a cooling and recovery device for levitated matter and sediment are attached.

  The separation tank 21 has a shape of a horizontal cylinder, and the heat medium (also referred to as heat medium oil) is input metal composite plastic from one end side to the other end side of the cylinder in which the metal composite plastic input port is disposed. It is sprayed on the upper surface of the separation tank and discharged from the other end side 35 of the separation tank. Therefore, the metal composite plastic 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 shape of the separation tank 21 is a horizontal cylinder, and the supply rate of the heat medium is adjusted, thereby separating the metal composite plastic necessary for separation. 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.

  In addition, it is possible to arbitrarily and quantitatively control the residence time in the separation tank by installing a rotary weir 23 in the separation tank 21 and adjusting the rotation speed, and various metal composite plastic wastes Can be handled.

  In addition, by disposing the sediment recovery device 25 from one end to the other end of the lower part of the separation tank 21, after the metal composite plastic waste is charged, the unseparated metal composite plastic waste having a higher specific gravity than the heat transfer oil is quickly settled. In this case, the sediment scraper can be continuously separated and recovered by changing the sediment scraper to a speed necessary for the separation.

  The recovery devices 24 and 25 each use a scraper conveyor 33. However, the present invention is not limited to this. For example, the generated plastic floating material such as a screw conveyor, a sediment due to a metal having a high specific gravity, etc. As long as it can be continuously carried out of the system.

  The float cooling / recovery device and sediment cooling / recovery device 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.

  Arrangement of the levitated material cooling recovery device and the sediment cooling recovery device is arranged so as not to interfere with each other. For example, when the sediment cooling recovery device 34 is parallel to the separation tank 21, the levitated material cooling recovery device is placed in the separation tank 21. If the sediment cooling and recovery device is used as a base point, the floating material recovery port may be installed at the metal composite plastic waste input port of the separation tank 21 at an angle of 0 to 120 degrees.

  The exhaust gas heat medium removing device 31 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 21 and the heat medium circulation tank 29 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.

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. As the immersion temperature of the metal composite plastic waste by the heat medium (oil), 150 to 350 ° C, preferably 250 to 300 ° C is used.
Japanese Patent Application No. 2002-198702

  The metal composite plastic waste separation facility described in Patent Document 1 described above has the following problems.

  The floated material separated and floated in the separation tank is collected from the separation tank by the floated object cooling and recovery device equipped with a scraper conveyor. There is a problem that it is taken out of the separation tank.

  Therefore, the amount of the heat medium in the separation tank becomes insufficient, and it is necessary to replenish the heat medium, so that the operation cost in the metal composite plastic waste separation facility increases.

  The present invention has been made to solve the above-described problems of the prior art, and can prevent the heat medium from being taken out of the separation tank, so that the operating cost of the metal composite plastic waste separation facility is reduced. It is an object of the present invention to provide a heat medium consumption reduction method in a metal composite plastic waste separation facility that can reduce the cost.

  The first heat medium consumption reduction method in the metal composite plastic waste separation facility according to the present invention is to separate the metal composite plastic waste by immersing the metal composite plastic waste in a separation tank in which the heat medium is stored. This is a method for reducing the amount of heat medium consumed in the separation facility for metal composite plastic waste, and the inclination angle of the levitated material scraper scooping the levitated material in the separation tank is set to 30 to 60 degrees.

  By setting the inclination angle of the levitated material scraper to 30 to 60 degrees, the heat medium adhering to the levitated material is easily separated from the levitated material, so that the heat medium is not taken out from the separation tank. .

  The inclination angle of the floater scraper is set to 30 to 60 degrees. If the tilt angle is less than 30 degrees, the falling speed when the heat medium falls from the floater scraper and returns to the separation tank is as follows. This is because the heat medium becomes difficult to be separated from the levitated material when the temperature exceeds 60 degrees, and the heat medium containing the levitated material spills out of the levitated material scraper, and the processing capacity of the levitated material scraper. This is because of a decrease.

  The second method for reducing heat medium consumption in the metal composite plastic waste separation facility according to the present invention is to immerse the metal composite plastic waste in a separation tank in which the heat medium is stored, This is a method for reducing the amount of heat medium consumed in the separation facility for metal composite plastic waste that is separated into two parts. Heating the levitated material scraper that scoops the levitated material and lowering the viscosity of the heat medium to remove the heat medium. It is to be separated from the par and floated material.

  Since the heating medium is separated from the floating material, the amount of the heating medium that is accompanied by the floating material and taken out of the separation tank is reduced.

  Further, since the heating medium does not return to the separation tank while adhering to the scraping plate of the floater scraper, the scraping ability of the scraper does not decrease.

  The third method for reducing heat medium consumption in the metal composite plastic waste separation facility according to the present invention is to immerse the metal composite plastic waste in a separation tank in which the heat medium is stored, This is a method for reducing the consumption of heat medium in the separation facility for metal composite plastic waste that is separated into two, along the moving direction of the scraper on the guide part provided below the levitated scraper that scoops the levitated material. A plurality of grooves that are large enough to pass only the heat medium are provided, and the heat medium that has been lifted up by the scraper through the grooves is returned to the separation tank.

  Since only the heating medium swept up by the scraper through the groove portion can be smoothly returned to the separation tank, the heating medium is less likely to be carried out of the separation tank along with the levitated matter.

  The fourth heat medium consumption reduction method in the metal composite plastic waste separation facility according to the present invention includes a metal composite plastic waste immersed in a separation tank in which the heat medium is stored. This is a method for reducing the amount of heat medium consumed in the separation facility for metal composite plastic waste that is separated into two parts. A plurality of openings are provided, and the heat medium accompanying the floating object is dropped from the opening of the scraping plate, thereby preventing the heat medium from accompanying the floating object.

  Since there are multiple openings large enough to pass only the heat medium along the width direction of the scraper of the levitated scraper that scoops the levitated object, only the heat medium associated with the levitated object is It is less likely that the heat medium falls from the opening and is accompanied by the floating material and taken out of the separation tank.

  According to the present invention, in the metal composite plastic waste separation facility, the heat medium is less likely to be taken out of the separation tank along with the floated material, so that the heat medium consumption can be reduced.

  Embodiments of the present invention will be described with reference to the drawings. The metal composite plastic waste separation equipment to which the heat medium consumption reduction method in the metal composite plastic waste separation equipment of the present invention is applied is the same as the conventional metal composite plastic waste separation equipment described with reference to FIG. Since the main components are the same, in the description of the embodiment of the present invention, only the floating scraper, which is the feature point, is described, and the description of the other components is omitted.

  FIGS. 1A and 1B are explanatory views of a floater scraper used in the embodiment of the present invention, wherein FIG. 1A is a plan view of the floater scraper, and FIG. 1B is a floater scraper. FIG.

  The float scraper 1 includes a drive side sprocket wheel 2, a driven side sprocket wheel 3, and a drive side sprocket wheel 2 driven by a drive motor (not shown). A pair of left and right endless link chains 4a and 4b that are hung between the side sprocket wheel 3 and the link chains 4a and 4b, and are integrated with the link chains 4a and 4b. And a plurality of scraping plates 5 that move. A plurality of scraping plates 5 are provided at regular intervals in the longitudinal direction of the link chains 4a and 4b, and their plate surfaces are orthogonal to the advancing direction of the link chains 4a and 4b and are endless. It arrange | positions so that it may be located in the outer side of link chain 4a, 4b which became.

  FIG. 2 is a diagram showing a state in which the above-described floater scraper-1 is arranged in a metal composite plastic separation tank. The levitated material scraper-1 is arranged such that the inclination angle of the levitated material discharge port 7 located above the separation tank 6 and the liquid surface 8 of the heat medium in which the levitated substance in the separation tank 6 is mixed is θ. And the lower part is arrange | positioned so that it may be immersed in the liquid in the separation tank 6. FIG.

  When the floating material scraper-1 discharges the floating material in the separation tank 6, the endless link chains 4a and 4b of the floating material scraper-1 are driven to rotate counterclockwise. When the endless link chains 4a and 4b are driven, the scraping plate 5 moves obliquely upward while scraping off the heat medium in which the floating matter in the separation tank 6 is mixed.

  Below the moving path of the scraping plate 5, a guide portion having the same inclination angle as that of the levitated object scraper 1 from the levitated substance discharge port 7 of the separation tank 5 toward the levitated substance discharge tank 9. 10 is provided, and the heating medium mixed with the floated material in the separation tank 6 scraped by the scraping plate 5 rises along the guide portion 10 while being lifted up by the scraping plate 5 and floats. It is discharged from the upper end portion of the object scraper-1 to the levitated object discharge tank 9. Then, the scraping plate 5 after the heat medium mixed with the floating material is discharged returns to the separation tank 6 side again around the drive side sprocket wheel 2 located at the upper end.

  An embodiment of the heat medium consumption reduction method in the separation facility for metal composite plastic waste of the present invention using the floated scraper-1 arranged as described above will be described below.

  In the first embodiment of the heat medium consumption reduction method of the present invention, the inclination angle θ of the levitated material scraper 1 described in FIG. 1 is set to 30 to 60 degrees. By tilting the levitated material scraper-1 in this way, the heat medium adhering to the levitated material is easily separated from the levitated material, so that the heat medium is not taken out from the separation tank.

  The inclination angle of the floater scraper is set to 30 to 60 degrees. If the tilt angle is less than 30 degrees, the falling speed when the heat medium falls from the floater scraper and returns to the separation tank is as follows. This is because the heat medium becomes difficult to be separated from the levitated material when the temperature exceeds 60 degrees, and the heat medium containing the levitated material spills out of the levitated material scraper, and the processing capacity of the levitated material scraper. This is because of a decrease.

  A second embodiment of the heat medium consumption reduction method of the present invention will be described with reference to FIG. FIG. 3 is a side view of a levitated scraper for explaining the heat medium consumption reduction method. The heat medium consumption reduction method includes a hot air pipe 11 that can supply hot air to the levitated object scraper 1 that scoops the levitated object, and a plurality of injection nozzles 12 arranged along the longitudinal direction of the hot air pipe 11. Hot air is blown onto the heat medium to reduce the viscosity of the heat medium so that the heat medium is separated from the scraper scraping plate 5 and the floating material.

  Since the heating medium is separated from the floating material in this way, the amount of the heating medium that is accompanied by the floating material and taken out of the separation tank is reduced.

  Moreover, since the heating medium does not return to the separation tank while adhering to the scraping plate, the scraping ability of the scraper is not lowered.

  In addition, it is good to use inert gas, such as nitrogen gas, for a hot air, and it may replace with supplying a hot air and a heater may be integrated in the floater scraper-1.

  A third embodiment of the heat medium consumption reduction method of the present invention will be described with reference to FIG. FIG. 4 is an explanatory view of the guide part of the levitated object scraper-1 for carrying out this heat medium consumption reduction method, (a) is a plan view of the guide part, (b) is A of (a). It is -A sectional drawing.

  In this heat medium consumption reduction method, only the heat medium along the moving direction of the scraper is passed through the guide portion 10 provided below the levitated material scraper 1 for scooping the levitated material. A plurality of groove portions 13 are provided, and the heat medium scraped by the scraping plate 5 through the groove portions 13 is returned to the separation tank 6.

  Thus, only the heating medium that has been lifted up by the scraping plate 5 through the groove portion 13 can be smoothly returned to the separation tank 6, so that the heating medium is accompanied by the floating substance and the separation tank 6. It is less likely to be taken outside.

  A fourth embodiment of the heat medium consumption reduction method of the present invention will be described with reference to FIG. FIG. 5 is an explanatory view of a scraping plate for carrying out this heat medium consumption reduction method, (a) is a front view of the scraping plate, and (b) is a front view of another scraping plate.

  In this embodiment, as shown in FIG. 5 (a), a circular shape having a size that allows only the heat medium to pass along the width direction of the scraping plate 5 of the levitated scraper-1 that scoops levitated matter. A plurality of openings 14 are provided, and the heat medium associated with the floating object is dropped from the openings 14 of the scraping plate 5, thereby preventing the heat medium from accompanying the floating object.

  Since it has done in this way, since it provided with the opening 14 of the magnitude | size which lets only a heat medium pass along the width direction of the scraping board 5 of the levitating object scraper-1 which scoops levitating substance, it accompanies the levitating substance. Only the heat medium to be dropped falls from the opening 14 of the scraping plate 5, and the heat medium is less likely to be taken out of the separation tank 6 along with the floating material.

  FIG. 5B shows a configuration in which a plurality of semicircular openings 15 are provided at the tip portion of the scraping plate 5 instead of the circular opening 14 shown in FIG. Similar effects can be obtained.

  Note that the width, depth and pitch of the groove 13 of the guide portion 10 described in the description of the embodiment of the present invention, and the size and pitch of the openings 14 and 15 of the scraping plate 5 depend on the size of the float to be processed. May be determined as appropriate.

  In the metal composite plastic waste separation facility shown in FIG. 6, a centrifugal separator is arranged as a heat medium purification device 30 for refining the heat medium in the heat medium circulation tank 29, and the heat medium is pumped by a pump. It is also possible to circulate between the heat medium circulation tank 29 and the centrifugal separator to separate the heat medium and sludge contained in the heat medium. Thereby, since chlorine and bromine in the heat medium can be eliminated, the deterioration rate of the heat medium can be slowed, so that the life of the heat medium can be extended and the consumption of the heat medium can be reduced.

  In order to maintain a high separation efficiency of the metal composite plastic waste, the heat medium has a softening point of a certain value or less (about 115 ° C. when the coal tar and heavy oil are blended at a ratio of 2: 1). However, if the concentration of sludge containing chlorine or the like increases, the softening point of the heat medium will increase, so that the sludge in the heat medium will be removed at the bottom of the heat medium circulation tank. It is necessary to blow down the accumulated sludge. At this time, a part of the heat medium is also discharged together with the sludge, so that the heat medium is consumed in vain, but if the sludge is removed by a centrifuge, the waste of the heat medium is consumed. There is also an effect that it can be prevented.

In order to efficiently separate the sludge in the heat medium with the centrifuge, it is necessary to increase the residence time of the heat medium in the centrifuge as much as possible without reducing the supply temperature of the heat medium. Therefore, in order to prevent a temperature drop of the heat medium from the heat medium circulation tank to the centrifuge, the pipe and the centrifuge are heated with a heater, and the temperature of the heat medium is maintained at 150 ° C. or higher. The supply amount of the medium is preferably set to the lower limit of the capacity of the centrifuge (for example, 2 m ³ / m ² · Hr per unit filtration area).

It is explanatory drawing of the levitating object scraper used in embodiment of this invention, (a) is a top view of levitating object scraper, (b) is a side view of levitating object scraper. is there. It is a figure which shows the state by which the floater scraper is arrange | positioned at the separation tank of metal composite plastic. It is a side view of the levitated object scraper for demonstrating the 2nd Example of the heat-medium consumption reduction method of this invention. It is explanatory drawing of the guide part of the floater scraper for implementing the 3rd Example of the heat-medium consumption reduction method of this invention, (a) is a top view of a guide part, (b) is ( It is AA sectional drawing of a). It is explanatory drawing of the scraping board for enforcing the 4th Example of the heat medium consumption reduction method of this invention, (a) is a front view of a scraping board, (b) is another scraping board. It is a front view. It is a figure which shows the structure of the separation equipment of the conventional metal composite plastic waste.

Explanation of symbols

1 Floating object scraper
2 Drive side sprocket wheel 3 Driven side sprocket wheel 4a, 4b Link chain 5 Scraping plate 6 Separation tank 7 Floating object discharge port 8 Liquid level of heating medium 9 Floating object discharge tank 10 Guide part 11 Hot air piping 12 Injection nozzle 13 Groove part 14 Circular opening 15 Circular opening

Claims (4)

  A method for reducing heat medium consumption in a separation facility for metal composite plastic waste by immersing the metal composite plastic waste in a separation tank containing a heat medium and separating the metal composite plastic into metal and plastic. A method for reducing heat medium consumption in a metal composite plastic waste separation facility, wherein an inclination angle of a levitated scraper for scooping levitated matter is 30 to 60 degrees.   This is a method for reducing heat medium consumption in a metal composite plastic waste separation facility that separates metal composite plastic waste into metal and plastic by immersing the metal composite plastic waste in a separation tank in which the heat medium is stored. Heating medium consumption in a metal composite plastic waste separation facility characterized by heating the floating material scraper and lowering the viscosity of the heating medium to separate the heating medium from the scraper and floating material Reduction method.   This is a method for reducing heat medium consumption in a metal composite plastic waste separation facility that separates metal composite plastic waste into metal and plastic by immersing the metal composite plastic waste in a separation tank in which the heat medium is stored. A guide part provided below the floater scraper is provided with a plurality of groove parts of a size that allows only the heat medium along the moving direction of the scraper to pass, and is scraped up by the scraper through the groove part. The method for reducing heat medium consumption in a metal composite plastic waste separation facility, wherein the heat medium is returned to the separation tank.   This is a method for reducing heat medium consumption in a metal composite plastic waste separation facility that separates metal composite plastic waste into metal and plastic by immersing the metal composite plastic waste in a separation tank in which the heat medium is stored. By providing a plurality of openings of a size that allows only the heat medium to pass along the width direction of the scraper plate of the levitated scraper, and dropping the heat medium associated with the levitated object from the opening of the scraper plate, A method of reducing heat medium consumption in a separation facility for metal composite plastic waste, characterized in that the accompanying heat medium to the floating material is prevented.

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