A device for improving the pyrolysis efficiency of EVA adhesive film

Abstract

The utility model discloses a device for improving EVA adhesive film pyrolysis efficiency belongs to the technical field of waste photovoltaic module recycling, the device includes pyrolysis furnace and is used for bearing photovoltaic module's metal box. Its core improvement lies in, sets up the air inlet area on the placement platform of pyrolysis furnace, and is communicated active gas supply assembly below it. The metal box has upper and lower openings, and when placing, the lower opening part thereof covers on the air inlet area. Active gas supply assembly includes gas collecting cover, heating chamber and first electric heating tube, can preheat active gas, from below to top, flow into the metal box, and fully contact with broken photovoltaic module, can improve pyrolysis efficiency and reduce the use of active pyrolysis gas. The utility model discloses through optimizing airflow path and establishing grading heating system, solved the technical problem of uneven active gas contact, low pyrolysis efficiency and high energy consumption in traditional technology, realized the efficient, low energy consumption pyrolysis treatment of EVA adhesive film.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module recycling technology, specifically to a device for improving the pyrolysis efficiency of EVA film. Background Technology

[0002] Waste photovoltaic (PV) modules contain a large amount of valuable renewable materials. Currently, there are two main recycling processes. One involves crushing and sorting the modules, but because the various raw materials are mixed together after crushing, it's difficult to achieve high-purity separation of the raw materials. The other method uses pyrolysis to remove the EVA film, separating the glass from the silicon solar cells. Typical pyrolysis furnaces require high temperatures and the introduction of large amounts of active gas to promote EVA pyrolysis. However, since waste PV modules are usually stacked in metal boxes, the EVA film in the bottom modules has difficulty effectively contacting the active gas, thus reducing pyrolysis efficiency. This necessitates the introduction of large amounts of active gas during pyrolysis, which consumes a significant amount of energy and increases the cost of EVA pyrolysis. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a device for improving the pyrolysis efficiency of EVA films. It effectively solves the problem that photovoltaic modules stacked at the bottom of a metal box have difficulty effectively contacting the active gas, leading to reduced pyrolysis efficiency and high energy consumption.

[0004] To achieve the above objectives, the present invention provides the following technical solution.

[0005] An apparatus for improving the pyrolysis efficiency of EVA film includes a pyrolysis furnace having a feed inlet, a discharge outlet, and a placement platform. The apparatus further includes: A metal box having an upper opening, a lower opening, and a storage cavity located between the two openings, the storage cavity being used to hold photovoltaic modules to be pyrolyzed; The placement platform is provided with an air intake area, which has multiple transparent air inlets. An active gas supply assembly is connected to the lower part of the air inlet area and outputs active gas through the air inlet on the air inlet area; During pyrolysis, the metal box is placed on the placement platform, and the lower opening covers the air inlet area. The active gas supply component supplies active gas to the photovoltaic module inside the metal box through the air inlet area.

[0006] Furthermore, a support plate is vertically spaced inside the metal box, and an upward-opening storage opening is provided on one side wall of the metal box, with a baffle vertically slidingly fitted on the storage opening.

[0007] Furthermore, the support plate has multiple vertically permeable ventilation openings.

[0008] Furthermore, both the inlet and outlet are equipped with vertically sliding opening and closing doors.

[0009] Furthermore, the active gas supply assembly includes a gas collection hood fixed to the lower side of the placement platform and covering the air inlet area. The gas collection hood is connected to the heating chamber, and the heating chamber is connected to the gas supply device.

[0010] Furthermore, a plurality of first electric heating tubes are fixed in the heating chamber.

[0011] Furthermore, multiple second electric heating tubes are fixed on the inner walls of the pyrolysis furnace above and below the placement platform.

[0012] Furthermore, the active gas enters the metal box through the lower opening and then exits through the upper opening.

[0013] Furthermore, an exhaust gas outlet is provided above the side wall of the pyrolysis furnace.

[0014] Furthermore, the gas collection hood is connected to the heating chamber via a gas guide pipe. Compared with the prior art, the device for improving the pyrolysis efficiency of EVA film provided by this utility model has the following significant advantages: This invention, by setting up a placement platform with an air inlet area and an active gas supply component connected to it, allows high-temperature active gas to enter from the bottom of the metal box and penetrate the stacked photovoltaic modules from bottom to top. This structure ensures full and uniform contact between the active gas and the EVA film of the photovoltaic modules, especially the EVA film located in the lower part of the metal box, thereby significantly improving the overall pyrolysis rate and thoroughness. It effectively solves the following technical problems of existing technologies: the active gas flows through the upper part of the box but fails to make sufficient contact with the EVA at the bottom and inside of the box; most of the gas is discharged without contacting the waste modules, while also carrying away a large amount of heat, resulting in a slow reaction rate, high energy consumption, and high pyrolysis cost.

[0015] Because the active gas is directly and efficiently delivered to the reaction zone and fully reacts with the EVA film, the gas utilization rate is extremely high, avoiding the waste caused by the direct emission of a large amount of unreacted gas. Simultaneously, by incorporating a gas heating device, the active gas can be preheated to a high temperature (e.g., above 600°C). This not only improves reaction kinetics but also reduces the heat dependence on the main heating unit of the pyrolysis furnace, lowering the additional energy required to compensate for the heat carried away by the gas. Overall, this significantly reduces both gas consumption and total system energy consumption.

[0016] The high-temperature active gas introduced from the bottom serves not only as a reaction medium but also as a direct heat source. Working in synergy with the heaters on the inner wall of the pyrolysis furnace, it creates a more uniform and efficient temperature field inside the metal box. This "dual heating" mode enables photovoltaic modules to quickly and uniformly reach the required pyrolysis temperature, effectively shortening the heating time and the total pyrolysis cycle, further improving processing efficiency.

[0017] The metal box features a design with a support plate and a sliding baffle, facilitating the loading and unloading of photovoltaic modules while ensuring the structure's airtightness. The entire device has a compact structure, clearly defined functional modules, and is easy to apply and maintain in industrial applications.

[0018] In summary, this invention effectively overcomes the technical bottlenecks of insufficient gas contact, high energy consumption, and low efficiency in traditional EVA pyrolysis devices through innovative airflow guidance and heating system design. It achieves high-efficiency, low-energy-consumption, and low-cost EVA film pyrolysis treatment, which has significant application value in the field of resource recycling of waste photovoltaic modules. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pyrolysis process in an existing pyrolysis furnace. Figure 2 This is the front view of the present utility model; Figure 3 for Figure 2 Sectional view along line AA; Figure 4 This utility model is three-dimensional. Figure 1 ; Figure 5 This utility model is three-dimensional. Figure 2 ; Figure 6 This is a perspective view of the pyrolysis furnace part of this utility model (with the top plate of the pyrolysis furnace removed); Figure 7 for Figure 6 Another perspective 3D view of the structure shown; Figure 8 for Figure 6 Top view of the structure shown; Figure 9 This is a three-dimensional structural view of one embodiment of the metal box of this utility model; Figure 10 for Figure 9 Another perspective view of the structure shown after the baffle has been removed; Figure 11 for Figure 9 A cross-sectional view of the structure shown.

[0020] Explanation of reference numerals in the attached figures: Pyrolysis furnace 1, feed inlet 11, discharge outlet 12, placement platform 13, switch door 14, second electric heating tube 15, exhaust gas outlet 16, temperature sensor 17. Metal box 2, upper opening 21, lower opening 22, storage cavity 23, support plate 24, storage opening 25, baffle 26, vent 27. Air intake area 3, air intake 31; Active gas supply component 4, gas collection hood 41, heating chamber 42, first electric heating tube 43, gas guide tube 44; Photovoltaic module 5. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0022] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0024] It should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions in a substantially simultaneous manner or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0025] As one embodiment of this utility model, a device for improving the pyrolysis efficiency of EVA film is provided. In the prior art, such as... Figure 1 As shown, a pyrolysis furnace generally has at least a feed inlet 11, a discharge outlet 12, and a placement platform 13 for placing the photovoltaic modules to be pyrolyzed, such as... Figure 1 As shown, in the prior art, multiple photovoltaic modules to be pyrolyzed are stacked in a metal box, and then the metal box is placed on the placement platform through the feed port. The active gas enters from the air inlet on the side wall of the pyrolysis furnace and exits from the air outlet on the other side wall. Because the waste modules are stacked in the metal box, the reactive gas entering through the air inlet flows through the top of the box and fails to make sufficient contact with the bottom of the box and the EVA inside. Most of the gas is discharged without contacting the waste modules, and at the same time, it carries away a large amount of heat, resulting in a slow reaction rate, high energy consumption, and high thermal costs.

[0026] To solve the above-mentioned technical problems, this utility model improves the pyrolysis furnace, mainly by defining an air inlet zone 3 in the middle of the platform 13 inside the pyrolysis furnace 1, and arranging multiple air inlets 31 in the air inlet zone 3. The metal box 2 has an upper opening 21, a lower opening 22, and a storage cavity 23 located between the two openings. The storage cavity 23 is used to place the photovoltaic module 5 to be pyrolyzed. The lower side of the air inlet zone is connected to the active gas supply component 4. During pyrolysis, the metal box 2 is placed on the platform 13, and the lower opening 22 of the metal box 2 covers the air inlet zone 3. During the pyrolysis process, the active gas supply component 4 delivers active gas from the air inlet 31 of the air inlet zone 3 to the lower opening 22 of the metal box 2. Then, the active gas reacts with the EVA of the photovoltaic module, and the reacted gas is discharged outward through the upper opening 21 and the exhaust gas outlet 16.

[0027] In this embodiment, as an example, the lower opening 22 has a support plate 17 for supporting photovoltaic modules. The photovoltaic modules are then stacked sequentially on the support plate 17. The support plate 17 has multiple vents 27 for gas to pass through, allowing the active gas to flow upwards.

[0028] The workflow during pyrolysis is as follows: 1) Push the metal box 2 loaded with waste photovoltaic modules onto the placement platform 13 of the pyrolysis furnace 1, and completely cover the air inlet area 3 with the lower opening 22 of the metal box 2. 2) Close the furnace door and start the main heating system of pyrolysis furnace 1 to raise the furnace temperature to the set value; 3) Activate the active gas supply component 4 to continuously or pulse the active gas (such as oxygen-containing mixed gas) preheated to a high temperature (e.g., 500-600°C) to the intake zone 3; 4) The active gas flows out evenly from multiple air inlets 31, enters the storage cavity 23 of the metal box 2 through the lower opening 22, and penetrates the stacked photovoltaic modules from bottom to top. During the flow process, the high-temperature active gas undergoes a complete pyrolysis reaction with the EVA film in the photovoltaic module; 5) The waste gas after the reaction carries the pyrolysis products and escapes through the upper opening 21 of the metal box 2. Finally, it is guided to the subsequent treatment system through the waste gas outlet 16 at the top of the pyrolysis furnace.

[0029] To improve the pyrolysis effect of photovoltaic modules, the common practice is to crush the photovoltaic modules (with frames and junction boxes removed) into broken modules, and then use this technical solution to pyrolyze them. This improves the permeability of active gases, allowing them to fully contact the EVA film of the broken photovoltaic modules, thereby increasing pyrolysis efficiency and reducing the use of active pyrolysis gases. In existing technologies, crushing photovoltaic modules with frames and junction boxes removed typically involves using a crusher or roller press to break the modules, resulting in the glass panel and backsheet being in a broken state.

[0030] The structure described in this embodiment has the following significant advantages and beneficial effects: (1) The airflow path design is reasonable, which solves the core problem of uneven gas distribution: This structure, through the combination of "defined air inlet zone" and "metal box bottom opening coverage," creates a forced, bottom-up gas flow path. The active gas must enter from the bottom and traverse the entire material layer before exiting. This design completely avoids the shortcomings of traditional devices where the active gas merely skims over the top of the material and fails to effectively contact the bottom EVA film, ensuring the contact area and reaction uniformity between the gas and the material, thus fundamentally guaranteeing improved pyrolysis efficiency.

[0031] (2) The structure is simple and reliable, and easy to implement and maintain: This improved design requires no radical changes to the main structure of the pyrolysis furnace; it only necessitates setting up a specific air inlet area on the placement platform and connecting it to an external air source. The metal box, as a standard carrier, has a structure identical to conventional designs, offering high versatility. The entire system has no complex moving parts, relying primarily on static structural design to achieve its functions. This results in reliable operation, low manufacturing costs, and convenient maintenance, making it highly suitable for continuous industrial production environments.

[0032] (3) High gas utilization rate and significant energy saving and consumption reduction effect: Because the gas flow path is confined within the material layer, almost all the active gases participate in the pyrolysis reaction, resulting in extremely high effective gas utilization. This contrasts sharply with the situation described in the background art where "most gases are emitted without contacting the material." Therefore, while achieving the same or even better pyrolysis effect, this structure can significantly reduce the total consumption of active gases, directly lowering operating costs. Simultaneously, the efficient reaction also means a shorter pyrolysis time, leading to additional energy savings.

[0033] As an embodiment of this utility model, this embodiment specifically optimizes the metal box 2 that carries the photovoltaic module and the inlet and outlet structure of the pyrolysis furnace, aiming to further improve the pyrolysis uniformity of the device.

[0034] See Figure 3 , 4 The improvements in this embodiment, 5 and 9-11, are mainly in the following aspects: The support plate 24 and baffle structure of the metal box 2: Multiple support plates 24 are vertically spaced on two opposite side walls of the metal box 2. An upward-opening storage opening 25 is opened on the side wall of one of the non-fixed support plates 24 of the metal box, and a baffle 26 is vertically slidably fitted on the storage opening 25.

[0035] Ventilation structure on support plate 24: Multiple vertically permeable ventilation openings 27 are opened on support plate 24.

[0036] Sliding structure of furnace door: Vertically sliding opening and closing doors 14 are provided at the feed inlet 11 and the discharge outlet 12 of the pyrolysis furnace.

[0037] When the device is running, the above structure operates as follows: Loading stage: The operator transports the metal box 2 to the loading station, lifts the baffle 26 upwards, and opens the storage port 25. Then, the photovoltaic modules to be processed are inserted one by one into the storage cavity 23 of the metal box 2 along the support plate 24. Each support plate 24 can hold multiple layers of photovoltaic modules, or only one layer of photovoltaic modules.

[0038] Operation Phase: After loading is complete, the baffle 26 is slid down to the bottom, sealing the placement opening 25. Then, the metal box 2 is fed into the pyrolysis furnace via a conveyor mechanism. At this time, the vertical sliding door 14 of the pyrolysis furnace rises, and after the metal box is in place, the door 14 descends, sealing the furnace body. During pyrolysis, the active gas entering from the bottom flows upwards, passing through the vents 27 on the support plate 24. These vents 27 ensure that the gas can flow around and contact the entire surface of each component.

[0039] Unloading stage: After pyrolysis is complete, raise the switch door 14 and remove the metal box 2. After cooling, lift the baffle 26 again to easily pull out the separated photovoltaic modules from the side, completing the unloading process.

[0040] Baffle Design: Traditional top-loading metal boxes have limited operating space and are difficult to mechanize. This embodiment achieves lateral insertion and removal of photovoltaic modules through the design of the side storage port 25 and the support plate 24. This operating method provides ample space and smooth movement, making it very convenient for automated loading and unloading using robotic arms or conveyor belts, greatly improving production efficiency, reducing manual labor intensity, and making it suitable for continuous industrial production.

[0041] The support plate 24 itself is also a metal box structure reinforcement component, and it also integrates ventilation function. This multi-purpose design solves the two core problems of support and ventilation simultaneously without adding extra complex components, demonstrating the ingenuity and economy of the design.

[0042] In this embodiment, the door 14 can be raised and lowered by a cylinder.

[0043] In this embodiment, support platforms extending outward from the furnace body are connected to both ends of the placement platform. The extended support platform portion is used to place the photovoltaic modules to be entered and the photovoltaic modules to be output after pyrolysis.

[0044] As one embodiment of this utility model, this embodiment describes in detail the specific structure of the active gas supply component 4 and the heating system combined with the pyrolysis furnace body. This design aims to precisely control the temperature and flow direction of the reaction atmosphere, which is the core of achieving energy saving, consumption reduction, and improved pyrolysis efficiency.

[0045] See Figure 3 , 4 The gas supply and heating system of this embodiment is configured as follows: (6 and 8) Integrated gas supply and preheating system: The active gas supply component 4 mainly includes a gas collection hood 41, a heating chamber 42, and a gas guide pipe 44 connecting them. The gas collection hood 41 is fixed to the lower side of the placement platform 13 and completely covers the air inlet area 3, forming a sealed chamber. The gas collection hood 41 is connected to the independent heating chamber 42 through the gas guide pipe 44, and the inlet of the heating chamber 42 is connected to an external gas supply device (such as a fan and gas source).

[0046] Staged heating design: Inside the heating chamber 42, multiple first electric heating tubes 43 are fixed, their function being to heat the flowing active gas to a set high temperature. In addition, multiple second electric heating tubes 15 are fixed on the inner walls of the pyrolysis furnace 1 above and below the placement platform 13, forming the main heating system of the furnace body. A temperature sensor 17 is installed inside the gas collecting hood 41 for temperature feedback, used to control the heating power of the first heating tubes 43.

[0047] Optimized airflow and exhaust path: The flow path of the active gas within the system is designed as follows: it enters the metal box 2 from the lower opening 22 and finally exits from the upper opening 21. The waste gas after the reaction is concentrated at the waste gas outlet 16 located above the side wall of the pyrolysis furnace 1 for unified discharge.

[0048] During pyrolysis, the system works in a coordinated manner: First, the second electric heating tube 15 on the wall of the pyrolysis furnace is activated to provide basic heating to the furnace space and the metal box 2, thereby raising the overall temperature of the photovoltaic module.

[0049] Simultaneously or shortly thereafter, the first electric heating element 43 inside the heating chamber 42 is activated, and the gas supply device is turned on. When the active gas (such as oxygen-containing air) flows through the heating chamber 42, it is directly and efficiently heated to the required high temperature (e.g., 500-600°C) by the first electric heating element 43.

[0050] The preheated high-temperature active gas is transported to the gas collection hood 41 through the gas guide pipe 44. Since the gas collection hood 41 completely covers the air inlet area 3, the gas is forced and uniformly transported upward through all the air inlets 31, enters from the lower opening 22 of the metal box 2, and penetrates the entire photovoltaic module material layer from bottom to top.

[0051] During this process, the active gas undergoes a pyrolysis reaction with the EVA film, and the waste gas carries the products out from the upper opening 21, and is finally discharged from the waste gas outlet 16 above the furnace body.

[0052] This embodiment, through the synergistic design of integrated gas supply preheating and staged heating, brings multiple significant technical benefits: (1) It has achieved precise input and efficient utilization of energy: By setting up an independent heating chamber 42 and a first electric heating tube 43, the active gas is preheated individually. This means that the energy used to raise the gas temperature acts directly on the gas itself, resulting in extremely high thermal efficiency.

[0053] Compared to the prior art method of directly introducing cryogenic gas into the furnace and relying on the furnace environment for slow heating, this represents a qualitative leap in energy utilization. It avoids the huge heat loss caused by cryogenic gas absorbing and carrying away heat from the furnace body, fundamentally solving the problem of high energy consumption.

[0054] (2) A highly efficient "two-stage heating" temperature field is formed, resulting in faster and more uniform pyrolysis: This system constructs a composite thermal field consisting of "preheated active gas" (dynamic heat source) and "furnace wall second heating tube" (static heat source).

[0055] The high-temperature gas entering from the bottom acts as a powerful direct heat source, which can quickly replenish the heat of the lower material and form convection with the heat conducted from the top down in the furnace body. This greatly improves the heat transfer efficiency, makes the temperature in the material layer more uniform, and thus significantly shortens the total time required for pyrolysis.

[0056] (3) The airflow distribution is uniform and stable, ensuring the reaction effect: As a pressure-stabilizing chamber, the gas collection hood 41 can evenly distribute the gas to each air inlet 31 in the entire air inlet area 3, ensuring that the gas is evenly distributed on the bottom cross-section of the metal box 2, providing a solid foundation for subsequent uniform penetration from bottom to top.

[0057] The connection method of the air duct 44 provides flexibility in layout and facilitates the optimization of the internal structure of the equipment.

[0058] (4) The exhaust path is reasonable and conforms to the principles of thermodynamics: The forced "bottom-in, top-out" airflow path conforms to the natural upward movement of hot air, resulting in low flow resistance and low energy consumption.

Claims

1. An apparatus for improving the pyrolysis efficiency of EVA film, comprising a pyrolysis furnace (1), said pyrolysis furnace (1) having a feed inlet (11), a discharge outlet (12), and a placement platform (13), characterized in that, The device further includes: Metal box (2), the metal box (2) has an upper opening (21), a lower opening (22) and a storage cavity (23) located between the two openings, the storage cavity (23) is used to place the photovoltaic module (5) to be pyrolyzed; Air intake area (3), the placement platform (13) is provided with air intake area (3), the air intake area (3) has multiple transparent air inlets (31); An active gas supply assembly (4) is connected to the lower part of the air intake zone (3) and outputs active gas through the air intake port (31) on the air intake zone (3); During pyrolysis, the metal box (2) is placed on the placement platform (13), and the lower opening (22) covers the air inlet area (3). The active gas supply component (4) supplies active gas to the photovoltaic module (5) inside the metal box (2) through the air inlet area (3).

2. The apparatus for improving the pyrolysis efficiency of EVA film according to claim 1, characterized in that, The metal box (2) is vertically spaced with multiple support plates (24), and an upward-opening storage opening (25) is opened on one side wall of the metal box (2), with a baffle (26) vertically sliding on the storage opening.

3. The apparatus for improving the pyrolysis efficiency of EVA film according to claim 2, characterized in that, The support plate (24) has multiple vertically permeable vents (27).

4. The apparatus for improving the pyrolysis efficiency of EVA film according to claim 1, characterized in that, Both the feed inlet (11) and the discharge outlet (12) are equipped with vertically sliding opening and closing doors (14).

5. The apparatus for improving the pyrolysis efficiency of EVA film according to claim 1, characterized in that, The active gas supply assembly (4) includes a gas collection hood (41) fixed on the lower side of the placement platform (13) and covering the air inlet area (3), the gas collection hood (41) being connected to the heating chamber (42), and the heating chamber (42) being connected to the gas supply device.

6. The apparatus for improving the pyrolysis efficiency of EVA film according to claim 5, characterized in that, Multiple first electric heating tubes (43) are fixed inside the heating chamber (42).

7. The apparatus for improving the pyrolysis efficiency of EVA film according to claim 1, characterized in that, Multiple second electric heating tubes (15) are fixed on the inner walls of the pyrolysis furnace (1) above and below the placement platform (13).

8. The apparatus for improving the pyrolysis efficiency of EVA film according to claim 1, characterized in that, The active gas enters the metal box (2) through the lower opening (22) and then exits through the upper opening (21).

9. The apparatus for improving the pyrolysis efficiency of EVA film according to claim 1, characterized in that, The pyrolysis furnace (1) has an exhaust gas outlet (16) located above the side wall.

10. The apparatus for improving the pyrolysis efficiency of EVA film according to claim 5, characterized in that, The gas collection hood (41) is connected to the heating chamber (42) via the gas guide pipe (44).

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