Thermal decomposition device

Abstract

A plastic material layer is safely removed from a panel having a plastic material layer. The thermal decomposition device includes a thermal decomposition device mechanism (4), which includes a thermal decomposition furnace (301) for decomposing a panel (2) having a plastic material layer; and a superheated steam generating device (5) for generating superheated steam to be supplied to the thermal decomposition furnace (300). The furnace body (301) of the thermal decomposition furnace (300) includes a metal inner wall component (303) having a space for accommodating the panel (2); and a metal outer wall component (302) surrounding the inner wall component (303). The furnace body (301) includes a heat insulating material layer (313) between the inner wall component (303) and the outer wall component (302) surrounding the inner wall component (302); and a heat storage material layer (312) disposed between the inner wall component (302) and the heat insulating material layer (313).

Description

Technical Field

[0001] The invention relates to a thermal decomposition device which decomposes a panel having a layer of plastic material. Background Art

[0002] An example of a panel having a plastic material layer is a solar panel. The solar panel includes a solar cell unit that is held on one side of a cover glass by a plastic material layer, and a wiring member that is connected to the solar cell unit. Such a solar panel contains various metals and glass that can be recycled, so it is best to disassemble and reuse the used solar panel.

[0003] As a method for disassembling a solar cell panel, there is known a method of heating the solar cell panel in a furnace under an atmospheric environment to burn off the plastic material and separate the cover glass, solar cell cells, and wiring members (see, for example, Patent Document 1).

[0004] [Prior art literature]

[0005] [Patent Literature]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-165150 Summary of the invention

[0007] [Problems to be solved by the invention]

[0008] However, in the method disclosed in Patent Document 1, since the solar cell panel is subjected to high-temperature heating in a furnace under an atmospheric environment, there is a possibility that a fire or the like may occur in the furnace.

[0009] The present invention has been made in order to improve this situation.

[0010]

Methods for solving the problem

[0011] The thermal decomposition device of the present invention comprises: a thermal decomposition device mechanism, which includes a thermal decomposition furnace for decomposing a panel having a plastic material layer; and a superheated steam generating device for generating superheated steam supplied to the thermal decomposition furnace, wherein the furnace body of the thermal decomposition furnace comprises a metal inner wall component having a space for accommodating the panel; and a metal outer wall component surrounding the inner wall component, a heat insulating material layer being provided between the inner wall component and the outer wall component, surrounding the inner wall component; and a heat storage material layer being arranged between the inner wall component and the heat insulating material layer.

[0012] According to the thermal decomposition device of the present invention, the panel is heated by using superheated steam, so the panel having the plastic material layer can be heated in the superheated steam environment that contains almost no oxygen, and the occurrence of fire in the thermal decomposition furnace can be prevented, and the treatment can be performed safely. In addition, the furnace body of the thermal decomposition furnace is set to a double-layer structure of an inner wall member and an outer wall member, and the inner wall member is surrounded by a heat insulation material layer set between the inner wall member and the outer wall member, and a heat storage material layer is provided between the inner wall member and the heat insulation material layer, so when superheated steam is introduced into the inner wall member to increase the temperature inside the inner wall member, heat can be stored in the heat storage material layer. Therefore, when the thermal decomposition treatment of the panel is repeatedly performed, the time for the internal temperature of the inner wall member to reach the desired temperature after the panel is replaced can be shortened, and the treatment efficiency is improved. In addition, the space where the panel to be decomposed is set is surrounded by the metal inner wall member, so the gas and superheated steam in the inner wall member can be prevented or suppressed from contacting with the heat storage material layer and the heat insulation material layer, and the deterioration of the heat storage material layer and the heat insulation material layer can be reduced.

[0013] In the thermal decomposition device of the present invention, when the panel is, for example, a solar panel, since the solar panel is heated by high-temperature superheated steam, the plastic material layer such as the filler, adhesive, and back film covering the solar cell sublimates and gasifies, and can be decomposed into cover glass, solar cell, and metals (such as copper wire, etc.). Thus, the used solar panel can be decomposed into solar cell containing raw materials such as recyclable silicon and recyclable metals and glass without emitting gas with high environmental load.

[0014] In the thermal decomposition device of the present invention, a heat insulating sheet layer may be provided between the inner wall member and the outer wall member, the heat insulating sheet layer surrounding the inner wall member and being made of a flexible sheet-like heat insulating material.

[0015] According to such an aspect, since the thermal expansion of the metal inner wall member can be absorbed by the thermal insulation sheet layer, damage to the thermal storage material layer and the thermal insulation material layer due to the thermal expansion of the inner wall member can be prevented.

[0016] In the thermal decomposition device of the present invention, the thermal decomposition furnace may also include a superheated steam inlet portion, which introduces superheated steam into the inner wall component, and the superheated steam inlet portion has a main line portion, which is designed to pass through the outer wall component and the inner wall component of the furnace body; and a branch line portion, which branches from the main line portion inside the inner wall component, and the main line portion has a main line, which is designed to pass through the outer wall component and the inner wall component; and a main line flange, which is threadedly connected to the end of the main line on the furnace outside.

[0017] According to such a mode, the main line part and the branch line part of the superheated steam inlet part excluding the main line flange are assembled, and the main line is inserted from the inside of the inner wall part through the main line insertion hole provided on the wall part of the furnace body and exposed to the outside of the furnace body, so that the assembled branch line part can be arranged inside the inner wall part. That is, by configuring so that the main line flange can be screwed to the end of the furnace outside of the main line of the superheated steam inlet part, the superheated steam inlet part can be easily installed on the furnace body, and the superheated steam inlet part can be easily removed from the furnace body, so the maintainability is improved. In addition, the operator can perform the installation and removal work of the superheated steam inlet part to the furnace body without drilling into the inside of the furnace body, so the burden on the operator is reduced. Furthermore, the hole diameter of the main line insertion hole provided on the wall part of the furnace body for inserting the main line of the hot steam inlet part can be controlled to a size that can insert the main line, so it is possible to suppress the heat inside the furnace body from being dissipated through the main line insertion hole.

[0018] In addition, in the thermal decomposition device of the present invention, the thermal decomposition furnace may include a superheated steam inlet portion, which introduces superheated steam into the inner wall component; and a gas outlet portion, which is used to discharge the gas in the inner wall component to the outside of the furnace body, and the superheated steam inlet portion may include an injection portion toward the exhaust port, which injects superheated steam inside the inner wall component toward the gas outlet of the gas outlet portion.

[0019] According to this aspect, by injecting superheated steam toward the gas outlet in the furnace body, the gas exhausted from the furnace body can be heated in the furnace body just before being sucked into the gas outlet, and the components contained in the gas exhausted from the furnace body can be thermally decomposed.

[0020] [Effects of the invention]

[0021] The thermal decomposition device of the present invention can remove the plastic material layer of the panel without emitting a gas with a high load on the environment. Furthermore, when the panel is a solar panel, the solar panel can be decomposed into solar cell units, and recyclable metals and glass, wherein the solar cell units contain recyclable raw materials such as silicon. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram showing a thermal decomposition device according to an embodiment.

[0023] Figure 2 This is a side view schematically showing an example of a thermal decomposition furnace.

[0024] Figure 3 This is a side view schematically showing an example of a gas cooling device.

[0025] Figure 4 This is a side view schematically showing another example of the thermal decomposition furnace.

[0026] Figure 5 This is a side view schematically showing another example of the gas cooling device.

[0027] Figure 6 It is a side view schematically showing still another example of the thermal decomposition furnace.

[0028] Figure 7 It is a side view schematically showing still another example of the thermal decomposition furnace.

[0029] Figure 8 It is a plan view schematically showing still another example of the thermal decomposition furnace.

[0030] Fig. 9 It is a side view which schematically shows the thermal decomposition furnace.

[0031] Fig.10 This is a plan view schematically showing the thermal decomposition furnace and the tray transfer carriage.

[0032] Fig.11 It is a side view schematically showing the thermal decomposition furnace and the tray transfer trolley.

[0033] Fig.12 It is a figure which shows schematically still another example of a gas cooling device, (A) is a plan view, and (B) is a side view.

[0034] Fig.13 This is a plan view schematically showing still another example of a thermal decomposition furnace in partial cross section.

[0035] Fig.14 The side view of the thermal decomposition furnace is schematically shown in partial cross section.

[0036] Fig.15 yes Fig.13 AA line cross-section diagram.

[0037] Fig.16 It is a cross-sectional view showing a state where the opening of the thermal decomposition furnace is opened.

[0038] Fig.17 This is a plan view schematically showing still another example of a thermal decomposition furnace in partial cross section.

[0039] Fig.18 The side view of the thermal decomposition furnace is schematically shown in partial cross section.

[0040] Fig.19It is a side view which schematically shows still another example of the thermal decomposition furnace in a partial cross section.

[0041] Fig. 20 This is a plan view schematically showing still another example of a thermal decomposition furnace in partial cross section.

[0042] Fig.21 The side view of the thermal decomposition furnace is schematically shown in partial cross section.

[0043] Fig. 22 This is a front cross-sectional view schematically showing still another example of the thermal decomposition furnace.

[0044] Fig.23 This is a front cross-sectional view schematically showing another example of the panel support.

[0045] Fig.24 (A) and (B) are cross-sectional views schematically showing other examples of the thermal decomposition furnace.

[0046] Fig.25 It is a side view which schematically shows still another example of the thermal decomposition furnace in a partial cross section.

[0047] Fig.26 The side view of the thermal decomposition furnace is schematically shown in partial cross section.

[0048] Fig. 27 It is a block diagram schematically showing a cooling system of a gas cooling device.

[0049] Fig.28 This is a block diagram schematically showing another example of the cooling system of the gas cooling device.

[0050] Fig.29 This is a side view schematically showing another example of a thermal decomposition furnace in partial cross section. DETAILED DESCRIPTION

[0051] Embodiments of the present invention will be described below with reference to the accompanying drawings. Figure 1 1 is a schematic structural diagram showing an embodiment of a thermal decomposition device. The thermal decomposition device 1 includes a thermal decomposition device mechanism 4 including a thermal decomposition furnace 3 for decomposing a panel 2 having a plastic material layer, and a superheated steam generating device 5 for generating superheated steam to be supplied to the thermal decomposition furnace 3. The thermal decomposition device mechanism 4 includes a gas cooling device 6 for cooling and solidifying the exhaust gas from the thermal decomposition furnace 3 containing the components of the plastic material layer gasified in the thermal decomposition furnace 3.

[0052] The superheated steam generated by the superheated steam generator 5 is supplied to the thermal decomposition furnace 3 via the superheated steam line 7. The exhaust gas from the thermal decomposition furnace 3 is introduced to the gas cooling device 6 via the exhaust gas line 8. The gas exhausted from the gas cooling device 6 is exhausted to the outside of the thermal decomposition device mechanism 4 via the exhaust fan 10 and the filter 11 provided in the exhaust pipe 9.

[0053] Panel 2 is, for example, a solar cell panel, and includes: a cover glass, a solar cell unit, a metal wiring member, and a back film, wherein the solar cell unit is held on one surface of the cover glass based on a plastic material layer, the metal wiring member is electrically connected to the solar cell unit, and the back film covers the surface of the plastic material layer on the side opposite to the cover glass. In addition, in panel 2, the metal frame attached to the peripheral portion of the solar cell panel is removed.

[0054] like Figure 2 As shown, the thermal decomposition furnace 3 comprises a furnace body 31 having an internal space; a superheated steam inlet pipe 32 connected to the end of the superheated steam pipeline 7 and guiding the steam from the outside to the inside of the furnace body 31; a gas outlet pipe 33 connected to the internal space of the furnace body 31 and connected to the exhaust gas pipeline 8; and a conveying section 34 for conveying the panel 2 so that the panel 2 passes through the furnace body 31.

[0055] The superheated steam introduction pipe 32 includes a main steam line portion (main line portion) 35 extending in the up-down direction through the upper surface of the furnace body 31, an upper steam line portion (branch line portion) 36 branching from the upper portion of the main steam line portion 35 in the furnace body 31, and a lower steam line portion (branch line portion) 37 communicating with the lower end of the main steam line portion 35. The main steam line portion 35 is provided at the upstream side of the furnace body 31 in terms of the conveying direction of the conveying portion 34. The upper steam line portion 36 is provided above the conveying portion 34 in a zigzag shape that turns back several times in a substantially horizontal plane. The lower steam line portion 37 is provided below the conveying portion 34 in a zigzag shape that turns back several times in a substantially horizontal plane.

[0056] The upper steam line section 36 is provided with a plurality of upper nozzles 38, which spray the superheated steam downward. In addition, the lower steam line section 37 is provided with a plurality of lower nozzles 39, which spray the superheated steam upward. That is, the upper nozzles 38 and the lower nozzles 39 are arranged in the thermal decomposition furnace 3 so as to sandwich the panel 2. The upper nozzles 38 and the lower nozzles 39 are arranged in the thermal decomposition furnace 3 along the horizontal plane parallel to the panel 2, for example, in a lattice shape or a staggered shape (houndstooth shape) when viewed from above.

[0057] In the thermal decomposition furnace 3, a gas outlet pipe 33 is provided at a downstream portion of the upper surface of the furnace body 31 in terms of the conveying direction of the conveying section 34. The gas outlet pipe 33 is connected to one end of the exhaust gas line 8. The conveying section 34 is configured to be able to place the panel 2 thereon and convey the panel 2 to pass through the furnace body 31.

[0058] like Figure 3 As shown, the gas cooling device 6 includes a sealed tank portion 61 for containing water 60; an exhaust gas inlet pipe 62, which is connected to the other end of the exhaust gas pipeline 8 and guides the exhaust gas from the outside to the inside of the sealed tank portion 61; and a gas outlet pipe 63, which is connected to the internal space of the sealed tank portion 61 and connected to the exhaust pipe 9.

[0059] The exhaust gas introduction pipe 62 is designed to extend in the up-down direction through the upper surface of the sealed tank portion 61. The upper end of the exhaust gas introduction pipe 62 is designed to protrude upward from the upper surface of the sealed tank portion 61 and is connected to the exhaust gas line 8. The lower end of the exhaust gas introduction pipe 62 is located at the lower part of the sealed tank portion 61 and is immersed in the water 60 contained in the sealed tank portion 61.

[0060] The gas outlet pipe 63 is designed to extend in the up-down direction through the upper surface of the sealed tank portion 61 at a position different from the exhaust gas inlet pipe 62. The lower end of the gas outlet pipe 63 is located in the upper part of the sealed tank portion 61 and is arranged not to be immersed in the water 60. The upper end of the gas outlet pipe 63 is designed to protrude upward from the upper surface of the sealed tank portion 61 and is connected to the exhaust pipe 9.

[0061] like Figure 3 As shown, the exhaust duct 9 is provided with an exhaust fan 10 and a filter 11 in order from the downstream side in the air flow direction. The exhaust fan 10 operates to move the gas in the exhaust duct 9 from the gas cooling device 6 to the filter 11 side.

[0062] Next, the decomposition method of the panel 2 by the thermal decomposition device 1 is described. Figure 3 As shown, the panel 2 is placed on the conveying unit 34 at a position upstream of the thermal decomposition furnace 3 in the conveying direction, and is transported into the furnace body 31 of the thermal decomposition furnace 3 by driving the conveying unit 34 .

[0063] In the furnace body 31, superheated steam is supplied from the superheated steam generating device 5 via the superheated steam line 7. The superheated steam supplied to the thermal decomposition furnace 3 is introduced into the superheated steam introduction pipe 32 of the thermal decomposition furnace 3, and is sprayed into the furnace body 31 from the upper nozzle 38 and the lower nozzle 39. The furnace body 31 is filled with superheated steam and is in a state of almost no oxygen. The temperature in the furnace body 31 is, for example, 400 to 1200 degrees, preferably 600 degrees or more.

[0064] The panel 2 having the plastic material layer transported into the furnace body 31 is heated to above 600° C. in the superheated steam environment, and the plastic resin constituting the plastic material layer is sublimated and vaporized. In the case where the panel 2 is a solar panel, the plastic material layer of the filler, adhesive, back film, etc. of the panel 2 is sublimated and removed, and the panel 2 is separated into the cover glass, solar cell unit, and metal wiring member.

[0065] Here, the plurality of upper nozzles 38 and lower nozzles 39 that spray superheated steam are arranged to sandwich the panel 2, so that the panel 2 can be efficiently heated from both sides, and decomposition of the panel 2 can be promoted to shorten the processing time.

[0066] Due to the driving of the exhaust fan 10, the gas cooling device 6 becomes negative pressure, so an airflow from the thermal decomposition furnace 3 to the gas cooling device 6 is generated in the exhaust gas line 8. The gas in the furnace body 31 is discharged to the outside of the thermal decomposition furnace 3 from the gas outlet pipe 33. The exhaust gas containing the plastic resin component discharged from the thermal decomposition furnace 3 is sent to the gas cooling device 6 through the exhaust gas line 8, and is introduced into the sealed tank part 61 through the exhaust gas introduction pipe 62.

[0067] The waste gas containing the vaporized plastic resin component is discharged from the lower end of the waste gas introduction pipe 62 into the sealed tank portion 61 and passes through the water 60. At this time, the waste gas is cooled, and the vaporized plastic resin component solidifies and settles in the sealed tank portion 61. As a result, most of the gas with a high load on the environment, such as carbon dioxide and hydrocarbon gas, can be prevented from being discharged to the outside of the gas cooling device 6.

[0068] The gas ejected from the exhaust gas inlet pipe 62 and passed through the water 60 is discharged from the sealed tank portion 61 through the gas outlet pipe 63 to the exhaust pipe 9 outside the gas cooling device 6. The exhausted gas is released into the surrounding environment (atmosphere) through the exhaust fan 10 and the filter 11 designed in the exhaust pipe 9. In addition, a mesh component and a porous component are designed at the lower end (top end) of the exhaust gas inlet pipe 62, which can disperse and reduce the bubbles ejected from the exhaust gas inlet pipe 62, thereby increasing the contact area between water and exhaust gas.

[0069] In the present embodiment, since harmful gas in the exhaust gas from the thermal decomposition furnace 3 is solidified by the gas cooling device 6 and then removed by the filter 11 of the exhaust pipe 9, it is possible to reliably prevent the harmful gas from being discharged to the outside.

[0070] The panel 2 from which the plastic material layer has been removed by the pyrolysis furnace 3 is transported to the outside of the pyrolysis furnace 3 on the downstream side of the transport direction by the driving of the conveying unit 34 and is recovered. In the case where the panel 2 is a solar cell panel, the recovered panel 2 is separated into cover glass, solar cell units, and metal wiring members, and can be recycled.

[0071] Thus, in the present embodiment, the panel 2 having the plastic material layer is heated by high-temperature superheated steam in the thermal decomposition furnace 3, so that the plastic material layer is sublimated and gasified, and the plastic material layer can be removed from the panel 2. Furthermore, the gas containing the plastic material component sublimated in the thermal decomposition furnace 3 is solidified by the water in the gas cooling device 6, so that the solid plastic material is precipitated in the gas cooling device 6, so that most of the gas with a large load on the environment, such as carbon dioxide and hydrocarbon gas, can be prevented from being discharged to the outside of the gas cooling device.

[0072] In addition, since the treatment object of the thermal decomposition device 1 is the panel 2 (plate-shaped), the internal space size of the thermal decomposition furnace 3 in the panel thickness direction can be reduced, and the energy required to make the internal space high temperature (for example, above 600 degrees) can be reduced. In addition, by arranging the plurality of nozzles 38 and 39 for spraying superheated steam to be opposite to the main surface (upper surface and lower surface) of the panel 2, the temperature deviation when the panel 2 is heated can be reduced, and the panel decomposition treatment time can be shortened. In addition, since superheated steam is used in the thermal decomposition device 1, the panel 2 having a plastic material layer can be heated in an environment that is almost free of oxygen, and a fire or the like can be prevented from occurring in the thermal decomposition furnace 3, and the treatment can be performed safely.

[0073] In addition, in the thermal decomposition furnace 3, considerations such as improving the energy efficiency of the thermal decomposition furnace 3 and suppressing the inflow of air into the furnace body 31 are taken into consideration. When it is desired to improve the airtightness of the furnace body 31, a door portion that can be opened and closed at the panel inlet (upstream side of transportation) and the panel outlet (downstream side of transportation) in the furnace body 31 can also be designed.

[0074] In addition, if Figure 4 As shown in (A), the introduction preparation chamber 12 and the exhaust preparation chamber 13 may be connected to the panel introduction port and the panel exhaust port of the furnace body 31. In this case, the introduction preparation chamber 12 and the exhaust preparation chamber 13 are connected to a gas supply pipe for supplying nitrogen (inert gas) or low-temperature water vapor below 200°C and filled with nitrogen or low-temperature water vapor, thereby suppressing the inflow of oxygen (air) into the furnace body 31.

[0075] In addition, if Figure 4As shown in (B), the furnace body 31 may be connected to the introduction preparation chamber 12 and the discharge preparation chamber 13, and the conveying section 34 may be divided into an introduction side conveying section 34A, an in-furnace conveying section 34B, and a discharge side conveying section 34C, and a door portion that can be opened and closed is provided at the upstream end of the introduction preparation chamber 12 in the conveying direction and the downstream end of the discharge preparation chamber 13 in the conveying direction. In this case, after the preparation chambers 12 and 13 are filled with nitrogen or low-temperature water vapor and the door portion is closed, the supply of nitrogen or low-temperature water vapor to the preparation chambers 12 and 13 is stopped, so that the inflow of oxygen into the furnace body 31 can be suppressed while reducing the supply of nitrogen or low-temperature water vapor, thereby reducing the processing cost.

[0076] In addition, the furnace transport section 34B may be divided into the introduction preparation chamber 12, the furnace main body 31, and the discharge preparation chamber 13, and the door portions of the panel introduction port and the panel discharge port of the furnace main body 31 may be designed. In this case, the panel 2 is introduced into the introduction preparation chamber 12 while the door portion of the panel introduction port of the furnace main body 31 is closed, and then the door portion of the panel introduction port of the introduction preparation chamber 12 is closed, and after the introduction preparation chamber 12 is filled with nitrogen or low-temperature water vapor, the door portion of the furnace main body 31 is opened to introduce the panel 2 into the furnace main body 31, thereby preventing oxygen from flowing into the furnace main body 31. In addition, in the state where the door portion of the panel discharge port of the discharge preparation chamber 13 filled with nitrogen or low-temperature water vapor is closed, the door portion of the panel discharge port of the furnace main body 31 is opened, and the panel 2 in the furnace main body 31 is discharged into the discharge preparation chamber 13, and after the door portion of the furnace main body 31 is closed, the door portion of the discharge preparation chamber 13 is opened to discharge the panel 2, thereby preventing oxygen from flowing into the furnace main body 31.

[0077] Furthermore, exhaust pipes connected to vacuum suction devices may be respectively connected to the introduction preparation chamber 12 and the discharge preparation chamber 13. In this case, the preparation chambers 12 and 13 are first evacuated to form a low oxygen state, and then nitrogen or water vapor is filled in the preparation chambers 12 and 13, so that oxygen can be more reliably suppressed from flowing into the furnace body 31.

[0078] In addition, the gas cooling device 6 may also be Figure 5 As shown, multiple sealed tank portions 61 are connected. In the present embodiment, three sealed tank portions 61 are designed, and the exhaust gas pipeline 8 is connected to the exhaust gas inlet pipe 62 designed in the first section (the most upstream side in the airflow direction) of the sealed tank portion 61. The gas outlet pipe 63 designed in the first section of the sealed tank portion 61 is connected to the exhaust gas inlet pipe 62 designed in the second section (the second in the airflow direction) of the sealed tank portion 61 via the connecting pipe 14. The gas outlet pipe 63 designed in the second section of the sealed tank portion 61 is connected to the exhaust gas inlet pipe 62 designed in the third section (the most downstream side in the airflow direction) of the sealed tank portion 61 via the connecting pipe 15. The gas outlet pipe 63 of the third section of the sealed tank portion 61 is connected to the exhaust pipe 9.

[0079] In the present embodiment, the waste gas discharged from the thermal decomposition furnace 3 is more reliably cooled by utilizing the water 60 in the three sealed tank portions 61, so that the plastic material components contained in the waste gas can be precipitated in each sealed tank portion 61 of the gas cooling device 6, thereby more reliably preventing gases with high environmental loads such as carbon dioxide and hydrocarbon gases from being discharged to the outside of the gas cooling device 6.

[0080] In addition, by connecting a plurality of sealed tank sections 61 in parallel between the exhaust gas pipeline 8 and the exhaust pipe 9, the amount of exhaust gas introduced into each sealed tank section 61 can be reduced, thereby suppressing the temperature rise of the water 60 in each sealed tank section 61, so that the plastic material components contained in the exhaust gas can be reliably precipitated in each sealed tank section 61 of the gas cooling device 6.

[0081] In the above embodiment, the thermal decomposition device 1 includes the continuous thermal decomposition furnace 3 having the conveyor 34 for conveying the panel 2 through the furnace body 31 , but a batch thermal decomposition furnace may also be used.

[0082] For example Figure 6 As shown, the batch type thermal decomposition furnace 3A is provided with a plurality of rail members 40 spaced apart from each other in a substantially horizontal plane at a position between an upper nozzle 38 and a lower nozzle 39 when viewed from the inside of the furnace body 31. The tray member 41 on which the panel 2 is placed is placed into the furnace body 31 through a door 42 designed on the side of the furnace body 31 and capable of being opened and closed, and the panel 2 can be placed on the rail member 40 through the tray member 41.

[0083] In the above embodiment, the upper nozzle 38 and the lower nozzle 39 are arranged to sandwich the panel 2 arranged in the furnace body 31, but the arrangement of the nozzles that spray superheated steam is not limited thereto and can be appropriately changed.

[0084] For example, you can Figure 7 As shown in the thermal decomposition furnace 3B, Figure 6 The structure is to remove the lower steam line 37 and the lower nozzle 39, so that the internal space height of the furnace body 31 (the size of the internal space of the thermal decomposition furnace 3 in the panel thickness direction) becomes smaller. As a result, the energy required to make the internal space of the furnace body 31 high temperature can be reduced. Such a structure can also be applied to Figure 2 and Figure 4 A thermal decomposition furnace 3 is shown.

[0085] Alternatively, an exhaust pipe connected to a vacuum suction device may be connected to the furnace body 31. In this case, the furnace body 31 is evacuated to a low oxygen state and superheated steam is supplied to the furnace body 31, so that the panel 2 can be heated in a low oxygen concentration environment.

[0086] Next, refer to Figure 8 and Fig. 9 An example of a thermal decomposition furnace is described. Figure 8 A plan view schematically showing still another example of the thermal decomposition furnace. Fig. 9 FIG. 1 is a side view schematically showing the thermal decomposition furnace. Figure 8 In FIG. 3 , the furnace body 31 is shown in cross section through the opening 31 a. Fig. 9 In FIG. 1 , the furnace body 31 is shown in a longitudinal section passing through the gas outlet pipe 33 .

[0087] The thermal decomposition furnace 3C of this embodiment is configured such that an opening 31a for taking out and putting in the tray member 41 is designed on one side of a substantially rectangular box-shaped furnace body 31, and the opening 31a can be sealed by a door 42 that can open and close. Figure 8 and Fig. 9 In the figures and the like, the furnace main body 31 is shown in cross section and is shown as an integral body, but the furnace main body 31 may be constructed by assembling a plurality of components.

[0088] The thermal decomposition furnace 3C is provided with a superheated steam introduction pipe 32, which includes a main steam line portion (main line portion) 35 for introducing superheated steam into the furnace body 31 and an upper steam line portion (branch line portion) 36. The upper steam line portion 36 is designed inside the furnace body 31. Figure 8 As shown, the upper steam line section 36 is designed to be zigzag multiple times in a substantially horizontal plane. The lower end of the main steam line section 35 that passes through the upper surface of the furnace body 31 and extends in the vertical direction is connected to the upper surface of the middle portion of the upper steam line section 36.

[0089] like Figure 8 and Fig. 9As shown, the main steam line portion 35 is designed at a portion near the door portion 42 (a portion near the opening portion 31a) on the upper surface of the furnace body 31. The upper steam line portion 36 has a forked branch portion 36a designed at a connection portion connected to the main steam line portion 35; a pair of inward-facing 36b, 36b extending from the branch portion 36a to the inner side (back side) of the furnace body 31 (the side opposite to the side where the opening portion 31a is designed); a pair of folded portions 36c, 36c, which are bent from the inward-facing 36b, 36b to directions away from each other and then folded toward the door portion 42; and a pair of outward-facing 36d, 36d extending from the folded portions 36c, 36c toward the vicinity of the door portion 42. In this embodiment, the upper steam line portion 36 is designed to be substantially M-shaped when viewed from above.

[0090] A plurality of upper nozzles 38 are provided on the lower surface of the upper steam line portion 36 so as to be opposed to the panel 2 disposed in the furnace body 31. In the present embodiment, four upper nozzles 38 are provided at intervals from each other at the inner 36b, 36b and the outer 36d of the upper steam line portion 36. In the present embodiment, these upper nozzles 38 are arranged in the thermal decomposition furnace 3 along the longitudinal and transverse directions of the horizontal plane parallel to the panel 2 (for example, the direction of taking out and putting in the tray member 41 and the direction orthogonal to the taking out and putting in the horizontal plane). In this way, by providing a plurality of upper nozzles 38 so as to be opposed to the panel 2 disposed in the furnace body 31 and to be spaced from each other, the temperature deviation of each area of ​​the panel 2 can be reduced, and the panel decomposition processing time can be shortened.

[0091] In the thermal decomposition furnace 3C, the plurality of upper nozzles 38 are designed to be in a lattice shape when viewed from above, but the arrangement of the upper nozzles 38 is not limited thereto, and may be arranged in a staggered shape (houndstooth shape) or in an irregular shape. Figure 6 The thermal decomposition furnace 3A shown in the figure is similarly provided with a lower steam line section 37 and a plurality of lower nozzles 39 below the panel 2. In this case, the plurality of lower nozzles 39 are arranged at intervals and face the lower surface of the panel 2 disposed in the furnace body 31. The shape of the lower steam line section 37 provided with a plurality of upper nozzles 38 and the arrangement of the lower nozzles 39 are the same as those of the upper steam line section 36, for example, but the shape and the arrangement of the nozzles may be different between the upper steam line section 36 and the lower steam line section 37.

[0092] like Figure 8 and Fig. 9As shown in FIG. 1 , in the thermal decomposition furnace 3C, the gas outlet pipe 33 designed on the upper surface of the furnace body 31 is designed near one of the two corners inside the furnace body 31 when viewed from above. Thus, in the furnace body 31, an air flow toward the corner where the gas outlet pipe 33 is designed can be formed, and the stagnation of gas in the furnace body 31 can be suppressed.

[0093] In addition, the thermal decomposition furnace 3C is provided with a pair of furnace roller conveyors 43, 43 extending from the outside to the inside inside the furnace body 31. Each furnace roller conveyor 43 is provided with a plurality of furnace rollers 44, which are designed to be able to freely rotate around a roller shaft, and the roller shaft extends in a direction orthogonal to the direction of taking out and putting in the tray member 41 in the horizontal plane. The furnace roller conveyors 43, 43 are designed to be spaced apart from each other in a direction orthogonal to the direction of taking out and putting in the tray member 41 in the horizontal plane, and are designed to support the tray member 41 in the furnace body 31. By designing the furnace roller conveyors 43, 43, the tray member 41 carrying the panel 2 can be smoothly taken out and put into the furnace body 31.

[0094] like Fig.10 and Fig.11 As shown, when the pallet component 41 and the panel 2 are taken out and put in the thermal decomposition furnace 3C, if a pallet moving trolley 51 with a roller conveyor is used, the taking out and putting in operation can be easily performed. The pallet moving trolley 51 includes two trolleys 52, 52 of the same structure. Each trolley 52 is equipped with a roller conveyor 53, and the roller conveyor 53 has a plurality of rollers 54 at a height position substantially the same as the roller conveyor 43 in the furnace of the thermal decomposition furnace 3C. A plurality of wheels 55 are installed at the lower part of the trolley 52, and the trolley 52 is configured to be movable by the rotation of the wheels 55. The two trolleys 52, 52 are configured to be connected and separated in the direction in which the articles can be transported by the roller conveyor 53.

[0095] The pallet component 41 is placed on the roller conveyor 53 of the pallet moving trolley 51 connected to the two trolleys 52. By arranging the pallet moving trolley 51 near the door 42 of the thermal decomposition furnace 3C, the pallet component 41 carrying the panel 2 can be easily taken out and put into the furnace body 31 by rotating the roller conveyor 43 in the furnace and the rollers 44, 54 of the roller conveyor 53. In addition, the pallet moving trolley 51 is designed with wheels 55, so that the pallet moving trolley 51 can be easily moved, and the pallet moving trolley 51 can be easily moved to the setting position (refer to Fig.10 and Fig.11) and the storage space. In addition, the tray moving trolley 51 has two detachable trolleys 52, 52, so the trolleys 52, 52 can be separated and stored in mutually separated positions, and the vacant space around the installation site of the thermal decomposition device can be effectively used as a storage space for the trolley 52. ​​In addition, the tray moving trolley 51 is not limited to a structure that can be separated into two trolleys 52, 52, and can also include one or more than three trolleys.

[0096] In addition, a handle 41a that can be grasped by an operator is designed on one side of the tray member 41. The operator grasps the handle 41a and can easily slide the tray member 41 on the roller conveyor 43 in the furnace and the roller conveyor 53. In addition, the structure of the portion of the tray member 41 on which the panel 2 is placed is not particularly limited, and it can be either plate-shaped or mesh-shaped.

[0097] Next, refer to Fig.12 An example of a gas cooling device will be described below. Fig.12 It is a figure which shows schematically still another example of a gas cooling device, (A) is a plan view, and (B) is a side view.

[0098] The gas cooling device 6A of this embodiment includes a sealed tank portion 61, an exhaust gas introduction pipe 62, and a gas outlet pipe 63. The sealed tank portion 61 includes a substantially rectangular box-shaped tank body portion 61a with an upper opening, and a tank cover portion 61b that seals the upper opening of the tank body portion 61a. The tank cover portion 61b is detachably mounted on the upper portion of the tank body portion 61a using bolts or the like.

[0099] An upper communication hole 61c and a lower communication hole 61d are provided on one side of the tank body 61a to communicate the inside and outside of the tank body 61a. The upper communication hole 61c is provided at a position slightly above the height center position of one side of the tank body 61a. The lower communication hole 61d is provided at the lower part of one side of the tank body 61a. For example, in a state where liquid is prohibited from being discharged from the lower communication hole 61d, water can be injected into the tank body 61a from the upper communication hole 61c, so that water can be stored in the tank body 61a.

[0100] When viewed from above, the tank cover 61b is penetrated by the exhaust gas inlet pipe 62 in the vertical direction near one of the two corners away from the communicating holes 61c and 61d, and is penetrated by the gas outlet pipe 63 in the vertical direction near the other corner. The upper part of the exhaust gas inlet pipe 62 and the upper part of the gas outlet pipe 63 are designed to protrude upward from the upper surface of the tank cover 61b. The lower end of the exhaust gas inlet pipe 62 is arranged at a lower position in the tank body 61a in order to be immersed in the water contained in the sealed tank part 61. The lower end of the gas outlet pipe 63 is located in the upper part of the sealed tank part 61 so as not to be immersed in the water contained in the sealed tank part 61. In addition, the gap between the opening designed in the tank cover 61b for inserting the pipes 62 and 63 and the pipes 62 and 63 can be sealed by, for example, welding.

[0101] In addition, a space is provided on the upper surface of the tank cover 61b between the communicating holes 61c, 61d and the pipes 62, 63 in a plan view so as to allow the exhaust fan 10 and the filter 11 (illustration omitted in (B)) to be installed. By installing the exhaust fan 10 on the tank cover 61b, the exhaust pipe 9 (see FIG. 1 ) connecting the gas outlet pipe 63 and the exhaust fan 10 can be connected. Figure 1 , Figure 3 etc.), and the overall thermal decomposition device can be made compact.

[0102] Next, refer to Figure 13 to Figure 16 Other examples of the thermal decomposition furnace will be described. Fig.13 It is a plan view schematically showing still another example of the thermal decomposition furnace. Fig.14 It is a side view which schematically shows the thermal decomposition furnace. Fig.15 (A) is a front view of the decomposition furnace. Fig.15 (B) Yes Fig.13 AA line cross-section diagram. Fig.16 1 is a cross-sectional view showing a state where the opening of the thermal decomposition furnace is opened. Fig.13 as well as Fig.16 In FIG. 1 , a furnace body 301 of a thermal decomposition furnace 300 is shown by a cross section through an opening 301a. Fig.14 , the furnace body 301 is shown using a central longitudinal section passing through an opening 301a.

[0103] <Overall Structure>

[0104] The thermal decomposition furnace 300 of this embodiment has an opening 301a (see FIG. 301 ) on one side of a substantially rectangular box-shaped furnace body 301 supported by a support stand 309, through which a tray member 41 can be taken out and put in. Fig.16 ) is configured to be able to close the opening portion 301a by a door portion 342 that can be opened and closed.

[0105] <Internal Structure>

[0106] The furnace body 301 includes a box-shaped outer wall member 302 having an opening at an opening portion 301a, and a box-shaped inner wall member 303 disposed inside the outer wall member 302. The inner wall member 303 has an opening at the opening portion 301a. The outer wall member 302 and the inner wall member 303 are formed of steel plates. The panel 2 placed on the tray member 41 is accommodated inside the inner wall member 303 together with the tray member 41.

[0107] A heat insulating sheet layer 311, a heat storage material layer 312, a heat insulating material layer 313, and a general brick layer 314 are formed between the outer wall member 302 and the inner wall member 303. The general brick layer 314 is formed by embedding red bricks in the outer wall bottom portion 302a, the outer wall back portion 302b, and the left and right outer wall side portions 302c of the outer wall member 302. The general brick layer 314 functions as a heat insulating material.

[0108] A heat storage material layer 312 is formed by arranging heat storage bricks (refractory bricks) so as to surround the upper, lower, left, and right surface portions (the inner wall bottom portion 303a, the left and right inner wall side portions 303c, and the inner wall upper surface portion 303d) of the inner wall member 303 on the inner side of the ordinary brick layer 314. A heat insulation sheet layer 311 made of a flexible sheet-like heat insulation material such as a heat insulation felt is formed between the left and right inner wall side portions 303c of the inner wall member 303 and the heat storage material layer 312.

[0109] A heat insulating material layer 313 composed of heat insulating bricks (refractory heat insulating bricks) arranged to surround the heat storage material layer 312 is formed inside the ordinary brick layer 314. The heat insulating material layer 313 also covers the inner wall back surface 303b of the inner wall member 303.

[0110] A heat insulating sheet layer 311 is formed between the ordinary brick layer 314 embedded in the back portion 302b of the outer wall and the heat insulating material layer 313. A heat insulating sheet layer 311 is also formed between the upper surface portion 302d of the outer wall and the heat insulating material layer 313. Figure 13 to Figure 16 As shown, the heat insulating sheet layer 311 is respectively arranged between the inner wall back portion 303b and the outer wall back portion 302b, between the inner wall side portion 303c and the outer wall side portion 302c, and between the inner wall upper surface portion 303d and the outer wall upper surface portion 302d.

[0111] like Figure 13 to Figure 15 As shown, the opening of the inner wall member 303 is located further back than the opening of the outer wall member 302. The heat insulating material layer 313 also includes a portion formed by arranging heat insulating bricks in a U-shape at the opening of the outer wall member 302 without blocking the opening of the inner wall member 303.

[0112] A cover heat storage material layer 322 composed of a plurality of heat storage bricks arranged to be detachable is formed near the opening inside the inner wall member 303. The opening of the inner wall member 303 is blocked by a detachable inner cover member 304. The inner cover member 304 is formed of a steel plate. In addition, a handle portion (not shown) that can be held by an operator may be provided on the inner cover member 304.

[0113] A cover heat insulating material layer 323 is formed on the outside of the inner cover member 304. The cover heat insulating material layer 323 fills the inside of the U-shaped heat insulating material layer 313 that opens upward and is composed of a plurality of heat insulating bricks that are arranged to be detachable. In this way, the opening of the outer wall member 302 is blocked by the ordinary brick layer 314 formed in a U-shape that opens upward, the heat insulating material layer 313 formed of heat insulating bricks, and the cover heat insulating material layer 323.

[0114] The door portion 342 that blocks the opening 301a (the opening of the outer wall member 302) of the furnace body 301 is formed of a steel plate. The left and right edges of the door portion 342 are connected to the opening side ends (front side ends) of the left and right outer wall side portions 302c of the outer wall member 302 via hinges 343 in a freely rotatable manner.

[0115] The cover heat insulating sheet layer 321 is attached to the door portion 342. When the door portion 342 is closed, the cover heat insulating sheet layer 321 blocks the opening of the outer wall member 302 by confronting the ordinary brick layer 314, the heat insulating material layer 313, and the cover heat insulating material layer 323 that block the opening of the outer wall member 302.

[0116] like Fig.16 As shown, when the panel 2 and the tray component 41 are taken out and placed into the inner wall component 303 of the furnace body 301, the door portion 342 holding the cover insulation sheet layer 321 is opened, and the cover insulation material layer 323, the inner cover component 304 and the cover heat storage material layer 322 are removed to expose the opening of the inner wall component 303.

[0117] When the panel 2 is disassembled, the panel 2 and the tray member 41 are first placed inside the inner wall member 303. Next, in order to block the opening of the inner wall member 303, the inner cover member 304 is placed on the basis of the cover heat storage material layer 322 to block the opening of the inner wall member 303. Furthermore, the cover heat insulation material layer 323 is placed on the front side of the inner cover member 304, and the door 342 is closed, and the opening 301a (the opening of the outer wall member 302) of the furnace body 301 is blocked by the cover heat insulation sheet layer 321 and the door 342. Then, the door 342 is fixed to the outer wall member 302 by a fixing tool (not shown).

[0118] like Figure 13 to Figure 15As shown, in the furnace body 301, the upper surface, the lower surface and the left and right sides of the inner wall member 303 are surrounded by the heat storage material layer 312, and the opening of the inner wall member 303 is blocked by the cover heat storage material layer 322. As a result, when superheated steam is introduced into the inner wall member 303 from the superheated steam introduction part 350 described later to increase the temperature inside the inner wall member 303, heat can be stored in the heat storage material layer 312 and the cover heat storage material layer 322. Therefore, when the door part 342 is opened and closed to repeat the thermal decomposition treatment of the panel 2, the time until the temperature inside the inner wall member 303 reaches the desired temperature can be shortened, and the treatment efficiency is improved.

[0119] In addition, if Fig.17 as well as Fig.18 As shown in FIG. 3 , a heat storage material layer 312 may be provided between the outer wall back surface portion 302b and the inner wall back surface portion 303b. This can further improve the heat storage effect of the furnace body 301.

[0120] like Figure 13 to Figure 15 As shown, the upper surface, the back surface, and the left and right sides of the inner wall member 303 are surrounded by a heat insulating material layer 313, and a cover heat insulating material layer 323 is arranged on the front side of the opening of the inner wall member 303. Thus, during the thermal decomposition treatment of the panel 2, it is possible to suppress the heat in the furnace body 301 (the heat in the inner wall member 303) from being released to the outside, thereby improving the treatment efficiency.

[0121] In addition, if Fig.19 As shown, the heat insulating material layer 313 may not be arranged below the inner wall member 303. Thus, the manufacturing cost of the furnace body 301 can be reduced, and the height dimension of the furnace body 301 can be reduced.

[0122] like Figure 13 to Figure 15 As shown, the heat insulating sheet layer 311 composed of a flexible thin sheet-shaped heat insulating material is respectively provided between the inner wall back portion 303b and the outer wall back portion 302b, between the inner wall side portion 303c and the outer wall side portion 302c, between the inner wall upper surface portion 303d and the outer wall upper surface portion 302d, and between the inner cover member 304 and the door portion 342. Thus, since the thermal expansion of the inner wall member 303 made of a steel plate can be absorbed by the heat insulating sheet layer 311, the heat storage material layer 312 and the heat insulating material layer 313 (bricks in this embodiment) can be prevented from being damaged due to the thermal expansion of the inner wall member 303.

[0123] In addition, the position where the heat insulating sheet layer 311 is arranged is not limited to the above embodiment, and as long as it is arranged between the outer wall member 302 and the inner wall member 303 to surround the back surface, left and right side surfaces, and the upper surface of the inner wall member 303, the thermal expansion of the inner wall member 303 can be absorbed. Fig. 20 as well as Fig.21As shown, the heat insulating sheet layer 311 may be provided adjacent to the inner wall back surface portion 303 b , the left and right inner wall side surfaces 303 c , and the inner wall upper surface portion 303 d of the inner wall member 303 .

[0124] In addition, since a plurality of bricks are placed on the inner wall member 303, a reinforcing member that suppresses the deflection of the inner wall upper surface portion 303d can also be designed. The reinforcing member can be formed, for example, by fixing steel plate ribs extending along the diagonal of the inner wall upper surface portion 303d to the upper surface of the inner wall upper surface portion 303d. In this case, a steel plate opposite to the inner wall upper surface portion 303d is provided on the reinforcing member, and bricks are placed on the steel plate, so that the bricks can be easily arranged above the inner wall member 303. In such a structure, it is preferred to fill the gap between the inner wall upper surface portion 303d and the steel plate thereon with a heat insulating material such as heat insulating felt, so that the space for gas flow between the outer wall member 302 and the inner wall member 303 is reduced.

[0125] like Figure 13 to Figure 15 As shown, the space where the panel 2 to be decomposed is provided is surrounded by the inner wall member 303 made of steel plate and the inner cover member 304. Thus, it is possible to prevent or inhibit the gas and superheated steam in the inner wall member 303 from contacting the heat insulating sheet layer 311, the heat storage material layer 312, the heat insulating material layer 313, and the ordinary brick layer 314, and it is possible to reduce the deterioration of each brick and the flexible heat insulating material.

[0126] In addition, if Fig. 22 As shown, the inner wall upper surface portion 303d of the outer wall member 302 may be opened and closed. Thus, the internal structure of the furnace body 301 can be assembled and disassembled with the inner wall upper surface portion 303d removed, so the assemblability and maintainability of the furnace body 301 are improved.

[0127] In addition, in the furnace body 301, the heat insulating sheet layer 311 may be any type as long as it is a flexible thin sheet-shaped heat insulating material. In addition, the heat storage material layer 312 is not limited to an arrangement of heat storage bricks, as long as it is formed of a material with high heat storage properties. In addition, the heat insulating material layer 313 is not limited to an arrangement of heat insulating bricks, as long as it is formed of a material with high heat insulation properties. In addition, the heat insulating material layer 313 may be arranged in place of the ordinary brick layer 314, or the ordinary brick layer 314 may be removed.

[0128] <Pipeline Structure>

[0129] Next, the pipeline structure of the furnace body 301 is described. Figure 13 to Figure 15 As shown, the thermal decomposition furnace 300 includes a superheated steam introduction portion 350 for introducing superheated steam into the inner wall member 303 of the furnace body 301; and a gas outlet portion 390 (see Fig.15) is used to discharge the gas in the inner wall part 303 to the outside of the furnace body 301.

[0130] The gas outlet portion 390 is provided to penetrate the inner wall upper surface portion 303d and the outer wall upper surface portion 302d in the vertical direction from the front portion of the left and right center portion of the inner wall upper surface portion 303d of the inner wall member 303. The gas outlet portion 390 includes a gas outlet pipe 391 provided to penetrate the inner wall upper surface portion 303d and the outer wall upper surface portion 302d; a three-way connector 392 threadedly connected to the upper end of the gas outlet pipe 391; a tubular connecting member 393 threadedly connected to the three-way connector 392; and an outlet pipe flange 394 threadedly connected to the connecting member 393. A hot air supply pipe 395 is connected to one interface of the three-way connector 392.

[0131] The outlet pipe flange 394 is connected to the exhaust pipe flange 8a, which is provided at one end of the exhaust gas pipe 8 connected to the gas cooling device 6. In addition, the gas outlet pipe 391 is a metal round pipe. The three-way connector 392, the connecting member 393, the outlet pipe flange 394 and the hot air supply pipe 395 are made of metal.

[0132] The superheated steam introduction portion 350 includes a main line portion 360 provided to penetrate the outer wall back portion 302 b and the inner wall back portion 303 b of the furnace body 301 , and a branch line portion 370 branching from the main line portion 360 inside the inner wall member 303 .

[0133] The main line section 360 includes a main line 361, which is arranged to pass through the upper part of the left and right central parts of the outer wall back part 302b and the inner wall back part 303b along the front-to-back direction, and is composed of a metal round tube; a metal main line flange 362, which is threadedly connected to the end of the main line 361 on the outside of the furnace; and a metal four-way connector 363, which is threadedly connected to the end of the main line 361 on the inside of the furnace.

[0134] On the back side of the furnace body 301, a main line insertion hole 306 for inserting the main line 361 is provided so as to penetrate the outer wall back side 302b, the ordinary brick layer 314, the heat insulating sheet layer 311, the heat insulating material layer 313, and the inner wall back side 303b. The main line flange 362 connected to the end of the main line 361 outside the furnace is connected to the steam line flange 7a provided at the end of the superheated steam line 7 for supplying the superheated steam generated by the superheated steam generating device 5.

[0135] The branch line section 370 disposed inside the inner wall member 303 includes a central branch line section 371 and left and right lateral branch line sections 375. The central branch line section 371 includes a central branch line 372, one end of which is threadedly connected to the four-way connector 363 and extends in the front-to-back direction; and a closing member 373 such as a cap, which is threadedly connected to the front end of the central branch line 372 (the end on the opposite side to the four-way connector 363).

[0136] The lateral branch line section 375 includes a lateral connecting pipe 376, which is formed into an L shape in a plan view, is threadedly connected to the cross connector 363, and extends outward to the left and right; an elbow connector 377 is threadedly connected to the left and right outer ends of the lateral connecting pipe 376; a lateral branch line 378 is threadedly connected to the elbow connector 377 and extends in the front-back direction; and a closing member 373 is threadedly connected to the front end (the end on the opposite side of the elbow connector 377) of the lateral branch line 378. The central branch line 372, the lateral connecting pipe 376, and the left and right lateral branch lines 378 are formed of metal round pipes. The closing member 373 and the elbow connector 377 are made of metal.

[0137] The central branch line 372, the horizontal connecting pipe 376, and the left and right horizontal branch lines 378 are arranged at the upper position of the internal space of the inner wall member 303. The central branch line 372 and the left and right horizontal branch lines 378 are respectively provided with a plurality of injection parts 380 for injecting superheated steam. In the present embodiment, the injection part 380 is formed by through holes formed in the central branch line 372 and the horizontal branch lines 378, and injects the superheated steam downward. The injection part 380 may also be a nozzle.

[0138] The central branch line 372 is arranged to pass below the lower end of the gas outlet pipe 391. The central branch line 372 is provided with an ejection portion 381 toward the exhaust port, for ejecting the superheated steam upward toward the gas outlet 305 formed by the lower end of the gas outlet pipe 391. In the present embodiment, the ejection portion 381 toward the exhaust port is formed by a through hole formed in the central branch line 372. The ejection portion 381 toward the exhaust port may also be a nozzle.

[0139] By injecting superheated steam toward the gas outlet 305 inside the furnace body 301, the gas exhausted from the furnace body 301 can be heated in the furnace body 301 (inside the inner wall member 303) just before being sucked into the gas outlet 305, and the components contained in the gas exhausted from the body 301 can be thermally decomposed. In addition, as long as the superheated steam can be injected from the injection portion 381 of the branch line portion 370 toward the gas outlet 305, the pipeline path of the branch line portion 370, the position and direction of the injection portion 381 toward the exhaust port, the position of the gas outlet 305, etc. are not particularly limited.

[0140] like Fig.15 As shown, in the gas outlet 390, the gas flowing from the inner wall member 303 toward the exhaust gas line 8 merges with high-temperature air of, for example, about 500 to 800 degrees from the hot air supply pipe 395 connected to the three-way connector 392. As a result, the components contained in the gas discharged from the inner wall member 303 can be decomposed, and the burnt smell of the gas discharged from the exhaust pipe 9 can be reduced.

[0141] In addition, the furnace body 301 may also be a structure in which the gas outlet 390 is not connected to the hot air supply pipe 395. In this case, a sealing member such as a plug is installed on the interface of the three-way connector 392 instead of the hot air supply pipe 395. In addition, an elbow connector may be used instead of the three-way connector 392.

[0142] In addition, the superheated steam introduction part 350 is screwed to the furnace outer end of the main line 361 that penetrates the wall (the back side in this embodiment) of the furnace body 301. In this structure, the main line part 360 and the branch line part 370 of the superheated steam introduction part 350 excluding the main line flange 362 are assembled, and the main line 361 is inserted from the inside of the furnace body 301 through the main line insertion hole 306 designed in the wall of the furnace body 301 and exposed to the outside of the furnace body 301, so that the assembled branch line part 370 can be arranged inside the furnace body 301. Then, the main line flange 362 is screwed to the end of the main line 361 exposed outside the furnace body 301, so that it can be connected to the steam line flange 7a.

[0143] In this way, by configuring the main line flange 362 to be threadedly connected to the furnace outer end of the main line 361 of the superheated steam introduction part 350, the superheated steam introduction part 350 can be easily installed on the furnace body 301, and the superheated steam introduction part 350 can be easily removed from the furnace body 301, so the maintainability is improved. In addition, the operator can perform the installation and removal operations of the superheated steam introduction part 350 to the furnace body 301 without drilling into the furnace body 301, so the burden on the operator is reduced. Furthermore, the hole diameter of the main line insertion hole 306 designed in the wall of the furnace body 301 for inserting the main line 361 of the hot steam introduction part 350 can be controlled to a size that can insert the main line 361 (for example, a size slightly larger than the outer diameter of the main line 361 and smaller than the outer diameter of the main line flange 362), so it is possible to suppress the heat inside the furnace body 301 from being dissipated through the main line insertion hole 306.

[0144] In addition, the main line insertion hole 306 may be formed in any part of the wall (upper surface, side surface, bottom surface, back surface) of the furnace body 301. In addition, the superheated steam inlet 350 and the gas outlet 390 are structures in which the connecting parts such as connectors and flanges are threadedly connected to the straight metal pipe in this embodiment, but the connecting parts may be fixed to the straight pipe by welding, or a bent pipe may be used. Among them, as described above, the main line 361 of the superheated steam inlet 350 and the main line flange 362 are preferably connected by threading.

[0145] <Panel support>

[0146] like Fig.14 as well as Fig.15 As shown, the panel 2 to be processed is placed on a panel support 400 designed on a tray member 41 and is accommodated in the furnace body 301 (inside the inner wall member 303). The panel support 400 includes a panel placement portion 401 on which the panel 2 is placed and a plurality of legs 402 for supporting the panel placement portion 401.

[0147] The tray member 41 has a side wall portion that stands upright on the peripheral portion of the bottom of the rectangular plate. The surface of the panel mounting portion 401 on which the panel 2 is mounted has a plurality of openings, for example, formed by a mesh or a porous plate. The leg portion 402 is provided to hang down from the peripheral portion of the panel mounting portion 401, and the lower end portion is provided on the tray member 41.

[0148] The panel mounting portion 401 is provided with a plurality of openings so that the high-temperature superheated steam can easily contact the lower surface of the panel 2, thereby uniformly heating the panel 2 as a whole, reducing the temperature deviation of each area of ​​the panel 2, and shortening the panel decomposition processing time.

[0149] The panel residue of the panel 2 after the decomposition process remains on the panel mounting portion 401 or falls from the opening of the panel mounting portion 401 and is collected on the tray member 41. In the present embodiment, the tray member 41 and the panel support platform 400 are configured to be separable. Thus, after the panel 2 is decomposed, the panel residue is taken out from the furnace body 301 together with the tray member 41 and the panel support platform 400, and then the tray member 41 and the panel support platform 400 are separated, so that the panel residue can be easily recovered.

[0150] like Fig.23 As shown, the panel support 400 may further include a plurality of panel placement sections 401 spaced apart in the vertical direction. According to this mode, by placing the panels 2 on the panel placement sections 401, the number of panels 2 that can be processed in one thermal decomposition process can be increased, and the processing efficiency is improved.

[0151] <Other examples of furnace bodies>

[0152] Fig.24 is a cross-sectional view for explaining another example of the furnace body. Fig.24 As shown in FIG. 1 , the inward surface 342a of the door 342 facing the inner wall member 303 in the closed state includes a frame-shaped heat insulating brick holding portion 344 for holding the cover heat insulating material layer 323. The inward surface 342a of the door 342 has the cover heat insulating sheet layer 321 pasted inside and around the heat insulating brick holding portion 344. A plurality of heat insulating bricks are fixed inside the heat insulating brick holding portion 344 to form the cover heat insulating material layer 323.

[0153] In addition, the inner cover member 304 includes a frame-shaped heat storage brick holding portion 345 for holding the cover heat storage material layer 322. A plurality of heat storage bricks are fixed inside the heat storage brick holding portion 345 to form the cover heat storage material layer 322.

[0154] In this modification, the cover heat insulating material layer 323 is supported by the door portion 342, so the cover heat insulating material layer 323 can be removed and installed by opening and closing the door portion 342, which improves convenience. In addition, the cover heat storage material layer 322 is supported by the inner cover member 304, so the inner cover member 304 and the cover heat storage material layer 322 can be removed and installed integrally, which improves convenience.

[0155] In addition, if Fig.24 As shown in (B), the inner cover member 304 having the heat storage brick holding portion 345 can be fixed to the heat insulation brick holding portion 344 designed in the door portion 342. Thus, by opening and closing the door portion 342, the cover heat insulation material layer 323, the inner cover member 304 and the heat storage brick holding portion 345 can be removed and installed at the same time, and the convenience is further improved.

[0156] In addition, in the above-mentioned embodiments and modifications, the cover insulation sheet layer 321, the cover heat storage material layer 322, the inner cover component 304, and the cover insulation material layer 323 are arranged in sequence from the door portion 342 side, but the arrangement positions of the inner cover component 304 and the cover insulation material layer 323 can also be replaced front to back, and the cover insulation material layer 323 can be arranged on the outside of the inner cover component 304.

[0157] <Other examples of pipeline structures>

[0158] Next, refer to Fig.25 as well as Fig.26 Other examples of pipeline structures are described below. Fig.25 This is a schematic side view showing a modified example of the thermal decomposition furnace using a partial cross section. Fig.26 This is a front view schematically showing the thermal decomposition furnace using a partial cross section.

[0159] In another example of the pipeline structure, the left and right lateral branch pipelines 375 of the branch pipeline 370 are provided to extend in the front-rear direction at a position lower than the panel mounting portion 401 of the panel support 400. One end (rear end) of the lateral branch pipeline 375 is connected to the cross connector 363 via the lateral connecting pipe 376, the first elbow connector 377a, the upper and lower connecting pipes 376a, and the second elbow connector 377b. These pipes and connectors are connected by, for example, threaded connection.

[0160] The injection portion 380 of the lateral branch line portion 375 is configured to inject superheated steam inwardly from left to right. Thus, superheated steam can be supplied toward the bottom of the panel 2, the entire superheated steam can be brought into contact with the panel 2 uniformly, and gas accumulation below the panel 2 can be prevented.

[0161] In addition, the injection portion 380 of the lateral branch line 378 (lateral branch line portion 375) is configured to inject the superheated steam obliquely upward toward the lower surface of the panel 2. Thus, the superheated steam can reliably contact the lower surface of the panel 2.

[0162] In addition, the angle θ formed by the direction of the injection portion 380 of the horizontal branch line 378 (the direction of injecting superheated steam) and the vertical direction is 0 to 180 degrees, preferably 0 to 90 degrees, and more preferably 45 to 90 degrees. The direction of the injection portion 380 of the horizontal branch line 378 is not limited to this, and it can be, for example, facing outward to the left or right. In addition, the direction of the injection portion of the central branch line 372 is not limited to facing downward, and can be in any direction.

[0163] In the above-mentioned embodiment (including the modified example), the pipeline structure of the superheated steam introduction part 350 can be any structure as long as it can introduce the superheated steam into the interior of the furnace body 301 (inside the inner wall member 303). For example, in the branch line part 370, a plurality of central branch line parts 371 can be designed, and a plurality of horizontal branch line parts 375 can be designed on the left and right.

[0164] <Cooling system>

[0165] Next, cooling of the gas cooling device will be described. Fig. 27 5 is a block diagram schematically showing a cooling system of a gas cooling device. The cooling system 500 for cooling the gas cooling device 6 immerses the gas cooling device 6 in cooling water stored in a cooling tank 501, and circulates the cooling water in the cooling tank 501 through a cooling water circulation path 502, while cooling the gas cooling device 6 with the cooling water. The number of gas cooling devices 6 arranged in the cooling tank 501 is two in the cooling system 500, but may be one or more than three.

[0166] The cooling water circulation path 502 is provided with a cooling water pump 503 and a heat exchanger 504. The cooling water flowing in the cooling water circulation path 502 is cooled by heat exchange with the cooling medium flowing in the cooling medium circulation path 505 connected to the heat exchanger 504. The cooling medium is, for example, water, but is not particularly limited. The cooling medium circulation path 505 is connected to a cooling medium tank 506 for storing and cooling the cooling medium and a cooling medium pump 507 for circulating the cooling medium.

[0167] The cooling system 500 can cool the sealed tank portion 61 and the water 60 therein by bringing the cooling water into contact with the outer periphery of the sealed tank portion 61 of the gas cooling device 6, thereby preventing the gas cooling function of the gas cooling device 6 from being reduced due to the high temperature of the water 60.

[0168] like Fig. 27 As shown, the cooling tank 501 is supplied with overflow pure water obtained by overflowing from a pure water manufacturing machine 510 that supplies pure water to the superheated steam generating device 5. The pure water manufacturing machine 510 is connected to a raw water path 511 for supplying raw water such as tap water, groundwater, and industrial water, a pure water supply path 512 for supplying pure water to the superheated steam generating device 5, a reserve tank 513 for storing pure water, and a pure water discharge path 514 for discharging overflow pure water.

[0169] The pure water discharged from the pure water discharge path 514 is supplied to the cooling tank 501 after cooling the air intake machine 10A provided in the exhaust pipe 9. The air intake machine 10A that exhausts the gas in the gas cooling device 6 is cooled, so that the waste can be reduced by utilizing the overflow pure water, and even when the gas flowing in the exhaust pipe 9 is at a high temperature, the suction function (air supply function) of the air intake machine 10A can be prevented from decreasing.

[0170] Furthermore, by supplying overflow pure water from the pure water production machine 510 to the cooling tank 501 and using it as cooling water, it is possible to eliminate or reduce the work of replenishing cooling water due to evaporation.

[0171] In addition, there is no need to operate the suction machine 10A or the exhaust fan 10 (see Figure 1 ), overflow pure water from the pure water manufacturer 510 may be directly supplied to the pure water manufacturer 510. In addition, when the cooling medium flowing in the cooling medium circulation path 505 is water, overflow pure water may be supplied to the cooling medium tank 506. In this case, the replenishment operation of replenishing water as the cooling medium to the cooling medium tank 506 can be omitted or reduced.

[0172] <Other examples of cooling systems>

[0173] Fig.28 500A is a block diagram schematically showing another example of a cooling system of a gas cooling device. In this cooling system 500A, a cooling water tank 508 storing cooling water is provided in the cooling water circulation path 502. Since the cooling system 500A does not have Fig.28 The heat exchanger 504, the cooling medium circulation path 505, the cooling medium tank 506, and the cooling medium pump 507 are shown, so that the gas cooling device 6 can be cooled with a simple structure.

[0174] In the cooling system 500A, overflow pure water discharged from the pure water production machine 510 via the pure water discharge path 514 is supplied to the cooling water tank 508. Thus, while utilizing the overflow pure water to reduce waste, the cooling water replenishment operation caused by evaporation can be eliminated or reduced. In addition, the overflow pure water can be supplied to the cooling water tank 508 or the cooling tank 501 via the exhaust fan 10 (or the air intake machine 10A), or it can be directly supplied to the cooling tank 501 from the pure water discharge path 514.

[0175] <Other Examples of Pyrolysis Furnaces>

[0176] Next, refer to Fig.29 Other examples of the thermal decomposition furnace will be described. Fig.29 FIG. 1 is a side view schematically showing another example of a thermal decomposition furnace. Fig.29 In FIG. 1 , the furnace body 31A, the introduction preparation chamber 12A, and the discharge preparation chamber 13A are shown in longitudinal section.

[0177] The thermal decomposition furnace 3 includes a furnace body 31A, an introduction preparation chamber 12A and an exhaust preparation chamber 13A connected to the furnace body 31A in front and back. The furnace body 31A, the introduction preparation chamber 12A and the exhaust preparation chamber 13A are respectively provided with a superheated steam introduction pipe 32, a gas outlet pipe 33 and an in-furnace conveying section 34B.

[0178] The superheated steam inlet pipe 32 includes a main steam line portion 35, an upper steam line portion 36, and an upper nozzle 38. The upper steam line portion 36 in the furnace body 31A is provided with a jet portion 381, which is formed of a nozzle and faces the exhaust port. In addition, the pipeline structure of the superheated steam inlet pipe 32 and the gas outlet pipe 33 may be any structure as long as it can introduce and discharge the superheated steam into the furnace body 31A, the introduction preparation chamber 12A, or the exhaust preparation chamber 13A. For example, the main steam line portion 35 may pass through the side portion of the housing, or may be connected to the upper steam line portion 36. Figure 13 to Figure 16 The superheated steam introduction pipe 32 and the gas outlet pipe 33 may have different line structures in the furnace body 31A, the introduction preparation chamber 12A, and the exhaust preparation chamber 13A.

[0179] The furnace body 31A includes a front opening 31Aa formed on the front side wall connected to the introduction preparation chamber 12A, and a rear opening 31Ab formed on the rear side wall connected to the discharge preparation chamber 13A. The introduction preparation chamber 12A includes an opening 12Aa for loading on the front side facing the furnace body 31A. The discharge preparation chamber 13A includes an opening 13Aa for discharging on the rear side facing the furnace body 31A.

[0180] An introduction side conveyor 34A is arranged at the front side of the introduction preparation chamber 12A. A discharge side conveyor 34C is arranged at the rear side of the introduction preparation chamber 12A. The introduction side conveyor 34A, the furnace conveyor 34B divided into three parts, and the discharge side conveyor 34C intermittently convey the panel 2 placed on the tray member 41 so as to stop in the introduction preparation chamber 12A, the furnace body 31A, and the discharge preparation chamber 13A through the openings 12Aa, 31Aa, 31Ab, and 13Aa.

[0181] The openings 12Aa, 31Aa, 31Ab, and 13Aa are each configured to be opened and closed by a door 42A. The door 42A that opens and closes the loading opening 12Aa is designed to be located outside the introduction preparation chamber 12A. The door 42A that opens and closes the front opening 31Aa is designed to be located inside the introduction preparation chamber 12A. The door 42A that opens and closes the rear opening 31Ab is designed to be located inside the discharge preparation chamber 13A. The door 42A that opens and closes the discharge opening 13Aa is designed to be located outside the discharge preparation chamber 13A.

[0182] The door 42A can be displaced to open and close the opening 12Aa, 31Aa, 31Ab or 13Aa by means of a door opening and closing mechanism (not shown). The door 42A is pressed against the periphery of the opening 12Aa, 31Aa, 31Ab or 13Aa in a closed state, and the tightness is improved. In addition, when the door 42A is opened, the pressing force toward the opening 12Aa, 31Aa, 31Ab or 13Aa is weakened, and the door 42A moves, for example, to the upper side in a manner of opening the opening 12Aa, 31Aa, 31Ab or 13Aa.

[0183] The interior of the furnace body 31, the introduction preparation chamber 12A, and the exhaust preparation chamber 13A are filled with superheated steam supplied from the superheated steam introduction pipe 32, and are in a state where oxygen is almost not contained. The temperature in the furnace body 31 is raised to a temperature at which the plastic resin contained in the panel 2 is vaporized, for example, 400 to 1200 degrees, preferably 600 degrees or more. The temperature in the introduction preparation chamber 12A is a temperature at which the water vapor does not turn into liquid water and the plastic resin contained in the panel 2 does not vaporize, for example, the lower limit temperature is 100 degrees or more and the upper limit temperature is 250 degrees or less, preferably 200 degrees or less. The temperature in the exhaust preparation chamber 13A is a temperature at which the water vapor does not turn into liquid water, that is, 100 degrees or more.

[0184] The tray member 41 on which the panel 2 to be decomposed is placed is placed on the introduction side conveying section 34A which is located upstream of the introduction preparation chamber 12A in the conveying direction. In the decomposition process step, the introduction opening 12Aa is first opened, and the panel 2 and the tray member 41 are moved into the introduction preparation chamber 12A by driving the introduction side conveying section 34A and the in-furnace conveying section 34B. Since the introduction opening 12Aa is temporarily opened, the surrounding air enters the introduction preparation chamber 12A, and the amount of water vapor and the temperature in the introduction preparation chamber 12A decrease. On the other hand, the front opening 31Aa of the furnace body 31A is closed by the door 42A, so the amount of water vapor and the temperature in the furnace body 31A do not change.

[0185] After that, the carrying-in opening 12Aa is closed. The introduction preparation chamber 12A is filled with the superheated steam supplied from the superheated steam introduction pipe 32, the air is exhausted, and the temperature is raised to a temperature at which the plastic resin contained in the panel 2 does not vaporize.

[0186] Next, the front opening 31Aa of the furnace body 31A is opened, and the panel 2 and the tray member 41 are moved into the furnace body 31A by driving the furnace conveying unit 34B in the furnace body 31A and the introduction preparation chamber 12A. At this time, the rear opening 31Ab of the furnace body 31A and the introduction preparation chamber 12Aa are closed by the door 42A. Since the front opening 31Aa is temporarily opened, the furnace body 31A and the introduction preparation chamber 12A are connected, and the furnace body 31A and the introduction preparation chamber 12A are filled with superheated steam, which is a state where there is almost no oxygen, so it is possible to prevent oxygen from flowing into these spaces. In addition, the superheated steam in the introduction preparation chamber 12A enters the body 31A, the temperature in the furnace body 31A decreases, and the temperature in the introduction preparation chamber 12A rises to a predetermined temperature (for example, about 200 degrees), so the temperature drop in the furnace body 31A can be reduced.

[0187] After that, the front opening 31Aa is closed. In the furnace body 31A, the temperature is raised to a temperature (for example, 600 degrees or more) at which the plastic resin contained in the panel 2 is vaporized due to the superheated steam supplied from the superheated steam inlet pipe 32. The panel 2 having a plastic material layer is heated to, for example, 600 degrees or more in the superheated steam environment, and the plastic resin is sublimated or decomposed and vaporized, and then discharged from the gas outlet pipe 33. In the case where the panel 2 is a solar cell panel, the plastic material layer of the panel 2, such as the filler, adhesive, and back film, is vaporized and removed, and the panel 2 is separated into the cover glass, the solar cell unit, and the metal wiring member.

[0188] After the plastic material layer of the panel 2 is removed in the furnace body 31A, the rear opening 31Ab of the furnace body 31A is opened, and the processed panel 2 (panel residue) and the tray member 41 are transferred to the discharge preparation chamber 13A by driving the furnace conveying unit 34B in the furnace body 31A and the discharge preparation chamber 13A. At this time, the front opening 31Aa of the furnace body 31A and the discharge opening 13Aa of the discharge preparation chamber 13A are closed. Since the rear opening 31Ab is temporarily opened, the furnace body 31A and the discharge preparation chamber 13A are connected, and the furnace body 31A and the discharge preparation chamber 13A are filled with superheated steam, and there is almost no oxygen, so it is possible to prevent oxygen from flowing into these spaces.

[0189] In addition, the superheated steam in the discharge preparation chamber 13A enters the furnace body 31A, and the temperature in the furnace body 31A decreases. However, the temperature in the discharge preparation chamber 13A is raised to a predetermined temperature (for example, 200 degrees or more), so the temperature drop in the furnace body 31A can be reduced. Here, before the rear opening 31Ab is opened, the temperature in the discharge preparation chamber 13A is raised to a higher temperature (for example, 300 degrees or more), so that the temperature drop in the furnace body 31A when the rear opening 31Ab is opened can be further reduced.

[0190] After the rear opening 31Ab is closed, the discharge opening 13Aa of the discharge preparation chamber 13A is opened, and the panel 2 (panel residue) and the tray member 41 are taken out of the discharge preparation chamber 13A by driving the furnace conveying unit 34B and the discharge side conveying unit 34C in the discharge preparation chamber 13A. At this time, the rear opening 31Ab of the furnace body 31A is closed, so that the temperature drop and air inflow in the furnace body 31A can be prevented. In addition, before opening the discharge opening 13Aa, a cooling time for lowering the temperature of the panel 2 and the tray member 41 in the discharge preparation chamber 13A can be designed.

[0191] Thus, according to the thermal decomposition furnace 3 of this embodiment, the panels 2 can be sequentially and continuously decomposed. In addition, the thermal decomposition furnace 3 of this embodiment can prevent oxygen from flowing into the high-temperature furnace body 31A, so the panels 2 can be decomposed safely.

[0192] In addition, during the decomposition process of the panel 2 in the furnace body 31A, the panel 2 to be processed next is moved into the introduction preparation chamber 12A and the introduction preparation chamber 12A is filled with superheated steam, thereby shortening the standby time when the next panel 2 is processed. In addition, in a state where the introduction preparation chamber 12A and the discharge preparation chamber 13A are filled with superheated steam, after the decomposition process of the panel 2 in the furnace body 31A is completed, the front opening 31Aa and the rear opening 31Ab are opened, and the panel 2 processed in the furnace body 31A is transferred to the discharge preparation chamber 13A while the panel 2 before processing in the introduction preparation chamber 12A is transferred to the furnace body 31A, thereby further shortening the processing time.

[0193] In addition, after the preparation chambers 12A and 13A are filled with superheated steam and the doors are closed, the supply of superheated steam to the preparation chambers 12 and 13 is stopped, thereby suppressing the flow of oxygen into the furnace body 31 and reducing the supply amount of superheated steam to reduce the processing cost. In addition, the gas supplied to the preparation chambers 12A and 13A may be nitrogen.

[0194] The furnace body 31A and the preparation chambers 12A and 13A can be formed, for example, as shown in FIG. Figure 13 to Figure 22The furnace body 301 described above may have the same structure. That is, the furnace body 31A and the preparation chambers 12A and 13A may include a metal inner wall member having a space for accommodating the panel; and a metal outer wall member surrounding the inner wall member, and a heat insulating material layer surrounding the inner wall member and a heat storage material layer provided between the inner wall member and the heat insulating material layer. Furthermore, in the furnace body 31A and the preparation chambers 12A and 13A, a heat insulating sheet layer may be provided between the inner wall member and the outer wall member, and the heat insulating sheet layer may surround the inner wall member and be composed of a flexible sheet-like heat insulating material.

[0195] In addition, the superheated steam introduction part for introducing the superheated steam into the furnace body 31A and the preparation chambers 12A and 13A can be formed, for example, as shown in FIG. Figure 13 to Figure 22 The superheated steam introduction part 350 described above has the same structure. That is, the superheated steam introduction part for introducing superheated steam into the furnace body 31A and the preparation chambers 12A and 13A may also include a main line part designed to pass through the outer wall member and the inner wall member of the furnace body; and a branch line part branched from the main line part inside the inner wall member, the main line part including a main line designed to pass through the outer wall member and the inner wall member; and a main line flange threadedly connected to the end of the main line outside the furnace.

[0196] The thermal decomposition device of the above-mentioned embodiment includes a thermal decomposition device mechanism part, which includes a thermal decomposition furnace for decomposing a panel having a plastic material layer; and an overheated steam generating device for generating overheated steam supplied to the thermal decomposition furnace, the thermal decomposition device mechanism part includes a plurality of gas cooling devices, the gas cooling devices cool and solidify the exhaust gas from the thermal decomposition furnace containing the components of the plastic material layer gasified by the thermal decomposition furnace, the thermal decomposition furnace includes a plurality of nozzles for spraying the overheated steam, the gas cooling device includes a sealed tank part for accommodating water; an exhaust gas introduction pipe for introducing the exhaust gas into the interior of the sealed tank part; and a gas outlet pipe for introducing the exhaust gas to the outside of the sealed tank part, in the interior of the sealed tank part, the end of the exhaust gas introduction pipe is set to be immersed in water, on the other hand, the end of the gas outlet pipe is set not to be immersed in water, and a mesh component or a porous component is designed at the end of the exhaust gas introduction pipe.

[0197] According to the thermal decomposition device of the above embodiment, the panel is heated by superheated steam, so the panel having the plastic material layer can be heated in the superheated steam environment that contains almost no oxygen, and the occurrence of fire in the thermal decomposition furnace can be prevented, and the treatment can be carried out safely. In addition, in the thermal decomposition device of the present invention, the panel having the plastic material layer is heated by using high-temperature superheated steam in the thermal decomposition furnace, so that the plastic material layer is sublimated and gasified, and the plastic material layer can be removed from the panel. Furthermore, the gas containing the plastic material component sublimated in the thermal decomposition furnace is solidified by the water in the gas cooling device, and the solid plastic material is precipitated in the gas cooling device, so that most of the gas with high environmental load such as carbon dioxide and hydrocarbon gas can be prevented from being discharged to the outside of the gas cooling device. In addition, the treatment object of the thermal decomposition device of the present invention is a panel (plate-shaped), so the size of the internal space of the thermal decomposition furnace in the thickness direction of the panel can be reduced, and the energy required to make the internal space high in temperature can be reduced. In addition, by arranging a plurality of nozzles for spraying superheated steam to face the main surface of the panel, the temperature deviation of the panel can be reduced, and the panel decomposition treatment time can be shortened.

[0198] In the thermal decomposition device of the above embodiment, when the panel is, for example, a solar panel, since the solar panel is heated by high-temperature superheated steam, the filler material covering the solar cell and the plastic material layer such as the adhesive and the back film are sublimated and gasified, and can be decomposed into the cover glass, the solar cell, and metals (such as copper wires, etc.). Thus, the used solar panel can be decomposed into the solar cell containing the raw materials such as silicon that can be recycled and the metal and glass that can be recycled without emitting the gas with high load on the environment.

[0199] In the thermal decomposition device of the above embodiment, the decomposition furnace may include a plurality of nozzles for spraying the superheated steam, and the plurality of nozzles may be arranged so as to sandwich the panel.

[0200] According to such an aspect, the panel can be efficiently heated from both sides, and decomposition of the panel can be promoted, thereby shortening the processing time.

[0201] In the thermal decomposition device of the above embodiment, the thermal decomposition furnace may include a plurality of nozzles for spraying the superheated steam, and the plurality of nozzles may be arranged vertically and horizontally along a horizontal plane parallel to the panel in the thermal decomposition furnace and disposed opposite to the panel.

[0202] In addition, in the thermal decomposition device of the above-mentioned embodiment, the thermal decomposition furnace may be provided with a superheated steam inlet pipe, which introduces superheated steam into the thermal decomposition furnace, and the superheated steam inlet pipe has a main line portion that passes through the thermal decomposition furnace and introduces superheated steam from the outside; and a branch line portion that is connected to the main line portion in the thermal decomposition furnace and is designed with the nozzle, and the branch line portion is constructed in a zigzag shape that is folded back multiple times in a horizontal plane parallel to the panel.

[0203] In the thermal decomposition device of the above-described embodiment, an exhaust pipe of the gas cooling device of the thermal decomposition device mechanism unit may include a filter.

[0204] According to such a mode, since harmful gas in the exhaust gas from the thermal decomposition furnace is solidified by the gas cooling device and then removed by the filter of the exhaust pipe, it is possible to reliably prevent the harmful gas from being discharged to the outside.

[0205] Furthermore, the thermal decomposition device of the present invention decomposes a panel having a plastic material layer, but the thermal decomposition device of the present invention can also be used to decompose plastic materials such as plastic bottles, waste containing plastic materials, and the like.

[0206] Although the embodiments have been described above, the present invention is not limited to the above embodiments, but can be embodied in various forms. The structure of each part is not limited to the illustrated embodiments, but can be modified in various ways without departing from the gist of the present invention.

[0207]

Explanation of symbols

[0208] 1 Thermal decomposition device

[0209] 2 Panels

[0210] 3 Pyrolysis furnace

[0211] 4 Thermal decomposition device mechanism

[0212] 5 Superheated steam generator

[0213] 6 Gas cooling device

[0214] 300 Pyrolysis Furnace

[0215] 301 furnace body

[0216] 302 Outer wall parts

[0217] 303 Inner wall parts

[0218] 305 Gas Exhaust Port

[0219] 306 Main line insertion hole

[0220] 311 Thermal insulation sheet layer

[0221] 312 Thermal storage material layer

[0222] 313 Insulation material layer

[0223] 350 Superheated steam inlet

[0224] 360 Main Line Department

[0225] 361 Main Line

[0226] 362 Main line flange

[0227] 370 branch pipeline

[0228] 381 Injection portion toward exhaust port

[0229] 390 Gas outlet

Claims

1. A thermal decomposition device, characterized in that: have: a thermal decomposition device mechanism, the thermal decomposition device mechanism comprising a thermal decomposition furnace for decomposing the panel having the plastic material layer; and A superheated steam generating device generates superheated steam to be supplied to the thermal decomposition furnace. The furnace body of the thermal decomposition furnace comprises a metal inner wall member having a space for accommodating the panel; and a metal outer wall member surrounding the inner wall member. A heat insulating material layer is provided between the inner wall member and the outer wall member, surrounding the inner wall member; and a heat storage material layer is provided between the inner wall member and the heat insulating material layer.

2. The thermal decomposition device according to claim 1, characterized in that: A heat-insulating sheet layer is arranged between the inner wall component and the outer wall component. The heat-insulating sheet layer surrounds the inner wall component and is made of a flexible sheet-like heat-insulating material.

3. The thermal decomposition device according to claim 1 or 2, characterized in that: The thermal decomposition furnace includes a superheated steam introduction portion for introducing superheated steam into the inner wall member. The superheated steam introduction part includes a main line portion provided to penetrate the outer wall member and the inner wall member of the furnace body; and a branch line portion branching from the main line portion inside the inner wall member. The main line portion includes a main line provided to penetrate the outer wall member and the inner wall member, and a main line flange threadedly connected to an end portion of the main line outside the furnace.

4. The thermal decomposition device according to claim 1 or 2, characterized in that: The thermal decomposition furnace includes a superheated steam introduction portion for introducing superheated steam into the inner wall member; and a gas outlet portion for discharging the gas in the inner wall member to the outside of the furnace body. The superheated steam introduction portion includes a jet portion directed toward the exhaust port, and the jet portion directed toward the exhaust port jets superheated steam toward the gas discharge port of the gas lead-out portion within the inner wall member.

Images