A wind turbine blade resource recycling system and its application method

Abstract

This invention proposes a wind turbine blade resource recovery system and its application method, belonging to the field of organic solid waste recycling. The system includes a feeder, a feed sealer, a feed conveyor, a pyrolysis reactor, a discharger, a discharge sealer, a discharge conveyor, and a low-temperature oxidation device. Wind turbine blades, simply cut to a certain size, are first fed to the feed sealer. After being isolated from outside air by the feed sealer, the blades are conveyed to the pyrolysis reactor for pyrolysis. The pyrolyzed material is then isolated from pyrolysis gases by the discharger, discharge sealer, and processing conveyor before being sent to the low-temperature oxidation device. The low-temperature oxidation device burns off the small amount of pyrolysis carbon generated during pyrolysis. After being cooled by a cooling conveyor, the fibers in the blades are recovered. This invention, through a clever continuous sealing design in the feeding and discharging processes, achieves continuous and sealed processing of large-sized wind turbine blades, improving fiber recovery efficiency.

Description

Technical Field

[0001] This invention belongs to the field of organic solid waste disposal and utilization, specifically relating to a wind turbine blade resource recycling system and its usage method. Background Technology

[0002] With increasing emphasis on environmental protection, the development and utilization of renewable and clean energy have received widespread attention worldwide. Wind energy, as an important clean and renewable energy source, has seen rapid development in recent years, with installed wind power capacity increasing year by year. Wind turbine blades are crucial components of wind power generation. Generally, blades are designed for a 20-year lifespan, but currently, early-operating blades on the market have exceeded 15 years. It is estimated that tens of thousands of tons of decommissioned blades and waste are generated annually, and the number of decommissioned blades will multiply within 5-8 years. Therefore, there is an urgent need to develop efficient methods for the disposal and utilization of wind turbine blades.

[0003] From a materials perspective, wind turbine blades are primarily composed of thermosetting resin composite materials reinforced with glass fiber or carbon fiber. They also contain elements such as foam, balsa wood core, adhesives, and coatings. Composite materials, as the main component of the blades, account for a significant portion of both usage and cost. Statistics show that composite materials currently account for over 90% of the total mass and over 50% of the total cost of existing wind turbine blades. Furthermore, thermosetting composite materials are chemically and physically stable and difficult to decompose in natural environments. Without proper disposal and utilization, this would result in substantial resource waste and environmental pollution.

[0004] Currently, the disposal and utilization of retired wind turbine blades is not yet mature. Existing technologies mainly include physical dismantling and recycling, energy utilization, chemical degradation, and pyrolysis. Physical dismantling and recycling primarily involves dismantling, cutting, and assembling the blades to create other products, such as containers and decorative items. The blades can also be shredded and crushed into powder, which can then be added to other composite materials, such as cement mortar, gypsum board, and modified plastic products. This is a downgraded utilization method with limited processing capacity and is not considered the ultimate utilization path for blades. Energy utilization mainly involves adding the blades to an incinerator for combustion to obtain energy for power generation and heating. However, due to the high inorganic content in composite materials, incomplete combustion and excessive emissions are common. Chemical methods use chemical solvents and controlled reaction conditions to break specific chemical bonds in polymers, ultimately achieving the separation and recovery of resin and fiber. However, this method is currently immature, costly, and difficult to implement industrially. Pyrolysis is a method that involves heating wind turbine blades under anaerobic conditions, causing the organic polymer resin components to undergo thermal decomposition and polymerization, forming small- to medium-sized molecule liquid or gaseous products, and then recycling the fibers and fillers. Pyrolysis is a simple, technologically mature, and highly efficient method, making it one of the most likely methods for industrial application.

[0005] Traditional continuous pyrolysis equipment such as fluidized bed, rotary furnace, and moving bed pyrolysis machines are only suitable for particulate materials. This requires crushing or even pulverizing the wind turbine blades. However, the crushing process damages the fiber structure, reducing its quality and making it difficult to reuse in wind turbine blade manufacturing. While non-continuous pyrolysis equipment such as fixed bed, kiln, and muffle furnace can process large-sized wind turbine blades, these devices can only operate intermittently, resulting in high energy consumption and low processing efficiency. Therefore, it is necessary to develop more efficient fiber recovery devices and methods to achieve efficient utilization of the fiber components of wind turbine blades. Summary of the Invention

[0006] The purpose of this invention is to overcome the lack of existing technology and provide a wind turbine blade resource recycling system and its usage method.

[0007] This system overcomes the problem of low bulk density of large-sized materials and easy air mixing during the feeding process by using a cleverly designed compressible air roller shaft in conjunction with nitrogen purging for sealed feeding. It achieves sealed feeding of large-sized fan blades, and then discharges the material using a movable sealing roller with variable roller spacing. This achieves complete isolation between the atmosphere of the pyrolysis device and the low-temperature oxidation device, and cooperates with the material to carry out temperature-controlled pyrolysis and low-temperature oxidation processes, thereby realizing high-quality recycling of the fiber components of the fan blades.

[0008] To achieve the above objectives and technical effects, the present invention provides a wind turbine blade resource recycling system through the following technical solution, comprising a feeder, a feed sealer, a feed conveyor, a pyrolysis reactor, a discharge machine, a discharge sealer, a discharge conveyor, and an oxidation device arranged sequentially and connected to each other, wherein:

[0009] The feeder includes a roller conveyor for supporting and conveying the fan blades and first curtains respectively located at the inlet and outlet of the feeder at both ends;

[0010] The feeding sealing machine includes a feeding sealing machine housing, a pair of feeding sealing roller groups arranged horizontally spaced apart within the feeding sealing machine housing, and a feeding support roller arranged between the pair of feeding sealing roller groups. Each feeding sealing roller group includes a pair of feeding sealing rollers whose axes are on the same vertical line and whose outer walls are adjacent to each other. Each feeding sealing roller includes a feeding drive shaft, an air cushion layer, a heat insulation layer, and a friction layer that are concentrically connected from the inside to the outside. The feeding sealing machine housing is provided with a nitrogen filling port, and the height of the apex of the feeding support roller is the same as the height of the adjacent point of the feeding sealing roller group.

[0011] The pyrolysis reactor has a temperature-controlled pyrolysis chamber and includes a rotary chain conveyor arranged inside the temperature-controlled pyrolysis chamber. One end of the rotary chain conveyor is directly opposite the discharge port of the feed conveyor, and the other end is directly opposite the feed port of the discharge machine. Multiple sets of first heating tubes arranged in parallel are arranged above the rotary chain conveyor and in the surrounding middle gap. A gas outlet is provided above the end of the temperature-controlled pyrolysis chamber near the discharge machine, a slag storage bin is provided below the end of the temperature-controlled pyrolysis chamber near the discharge machine, and a purging port is provided below the end of the temperature-controlled pyrolysis chamber near the feed conveyor.

[0012] The discharge sealing machine includes a discharge sealing machine housing, a pair of discharge sealing roller groups arranged horizontally spaced apart within the discharge sealing machine housing, and a discharge support roller arranged between the pair of discharge sealing roller groups. Each discharge sealing roller group includes a pair of discharge sealing rollers whose axes are on the same vertical line and whose outer walls are adjacent to each other. Each discharge sealing roller includes a discharge drive shaft and a stainless steel roller concentrically arranged around the outer periphery of the discharge drive shaft. The discharge sealing machine housing includes a movable cover plate and a fixed cover plate connected by a cover plate spring mechanism above the discharge sealing roller groups. The upper discharge sealing roller of the discharge sealing roller group is connected to the movable cover plate through a shaft spring mechanism connecting its discharge drive shaft and the movable cover plate. The discharge sealing machine housing is provided with a nitrogen inlet. The height of the apex of the discharge support roller is the same as the height of the adjacent point of the discharge sealing roller group.

[0013] The oxidation device has an oxidation chamber and includes a rotary grate arranged inside the oxidation chamber. One end of the rotary grate is provided with a first feed inlet connected to the discharge port of the discharge conveyor. The oxidation chamber has a vertical second feed inlet above the feed end near the discharge conveyor, a cleaning port below the feed end near the discharge conveyor, a flue gas outlet above the feed end away from the discharge conveyor, and a storage bin below the feed end away from the discharge conveyor. The portion above the rotary grate between the second feed inlet and the flue gas outlet is provided with multiple sets of parallel second heating tubes. An air distribution system is provided in the central gap surrounding the rotary grate.

[0014] Preferably, the system further includes a cooling conveyor, which includes an air inlet, an air outlet, a drop channel, an isolation curtain, and a roller moving mechanism. The roller moving mechanism is horizontally arranged behind the rotary grate. The air inlet and the air outlet are arranged at intervals above the roller moving mechanism along the conveying direction of the roller moving mechanism. The drop channel is located below the air outlet and is connected to a sealed unloader.

[0015] Preferably, in the aforementioned wind turbine blade resource recycling system, each of the feeding conveyor, the discharging conveyor, and the discharge conveyor is provided with a second curtain at both ends. The second curtain is woven from at least one of asbestos fiber or aluminum silicate fiber, and can be a curtain-like structure that can swing freely.

[0016] Preferably, in the aforementioned wind turbine blade resource recycling system, the thickness of the air cushion layer is 0.3 to 0.6 m.

[0017] Preferably, in the aforementioned wind turbine blade resource recycling system, the horizontal distance between the feed roller and the feed drive shaft is 0.6 to 1.2 m.

[0018] Preferably, in the aforementioned wind turbine blade resource recycling system, the minimum distance between the movable cover plate and the fixed cover plate is 0.3 to 0.5 m.

[0019] Preferably, in the aforementioned wind turbine blade resource recycling system, the width of the falling channel is greater than 1m and the height is greater than 2m.

[0020] This invention also provides a method for using a wind turbine blade resource recycling system, comprising the following steps:

[0021] Step 1: Turn on the first heating tube and the second heating tube to preheat the pyrolysis reactor and the oxidation device to the set pyrolysis temperature and oxidation temperature, respectively;

[0022] Step 2: Turn on the feed sealer and the discharge sealer, and introduce nitrogen into the housing of the feed sealer and the housing of the discharge sealer until the pressure reaches 1-3 kPa.

[0023] Step 3: Activate all mechanical moving parts, add the fan blades to be processed to the feeder, and make the fan blades pass through the temperature-controlled pyrolysis process in the pyrolysis reactor and the low-temperature combustion process in the oxidation device in sequence. The solid residue produced enters the cooling conveyor to cool down, and is discharged from the sealed unloader to obtain the fiber.

[0024] Step 4: At regular intervals, compressed nitrogen and air are introduced through the purge port and cleaning port to clean the pyrolysis reactor and oxidation device respectively, and the solids in the slag storage bin and material storage bin are cleaned. The solids are then sent to the oxidation device through the second feed port for reprocessing.

[0025] Preferably, in the aforementioned method of using a wind turbine blade resource recycling system, the wind turbine blades to be processed added in step 3 refer to wind turbine blades with dimensions of 1.5m×1.5m×0.05m to 2.0m×2.0m×0.1m.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. A system and method for recovering fibers from large-size wind turbine blades by temperature-controlled pyrolysis coupling and low-temperature combustion is proposed. This method solves the shortcomings of traditional physical and incineration methods in recovering fibers with high quality. It overcomes the problems of high energy consumption and low processing efficiency of traditional pyrolysis devices for recovering wind turbine blade fibers, and achieves high-quality recovery of fibers from retired wind turbine blades.

[0028] 2. A cleverly designed compressed air-sealed roller and nitrogen purging system for sealed feeding solve the problem of air mixing when feeding large-sized, low-bulk-density materials, enabling oxygen-free feeding of large-sized fan blades. At the same time, a self-adjustable roller gap sealing roller was designed, which solves the problem that compressed air-sealed rollers cannot be used in high-temperature environments. It completely isolates the oxygen-free atmosphere of the pyrolysis unit and the oxygen-rich atmosphere of the low-temperature oxidation unit, preventing them from interfering with each other. This enables continuous processing of fan blades with low energy consumption and high efficiency.

[0029] 3. By cleverly designing a rotary chain conveyor that supports the mobile pyrolysis of large-sized fan blades, and by using scientifically arranged heating tubes to heat the materials, precise temperature control of the pyrolysis process is achieved. The low-temperature oxidation device, through the scientifically arranged heating tubes and air distribution system, can achieve low-temperature combustion of pyrolysis residue, ensuring that the pyrolysis carbon residue is completely burned off and the fiber recycling quality is high. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a wind turbine blade resource recycling system.

[0031] [Explanation of Key Component Symbols]

[0032] 1-Feeder; 2-Feed sealing machine; 3-Feed conveyor; 4-Pyrolysis reactor; 5-Discharge machine; 6-Discharge sealing machine; 7-Discharge conveyor; 8-Oxidation device; 9-Cooling conveyor; 10-Sealed unloader; 11-Idler conveyor; 12-First curtain; 21-Feed drive shaft; 22-Air cushion layer; 23-Insulation layer; 24-Friction layer; 25-Nitrogen filling port; 26-Feed idler; 41-First heating pipe; 42-Gas outlet; 43-Rotary chain conveyor; 44- Slag storage bin; 45-Purge port; 61-Discharge drive shaft; 62-Shaft spring mechanism; 63-Modible cover plate; 64-Cover plate spring mechanism; 65-Fixed cover plate; 66-Nitrogen inlet; 67-Discharge roller; 81-Second feed inlet; 82-Second heating tube; 83-Flue gas outlet; 84-Rotary grate; 85-Air distribution system; 86-Purge port; 87-Storage bin; 91-Air inlet; 92-Air outlet; 93-Falling channel; 94-Isolation curtain; 95-Roller moving mechanism. Detailed Implementation

[0033] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0034] This invention addresses existing problems by providing a wind turbine blade resource recycling system. The system is ingeniously designed, easy to operate and maintain, and highly automated, enabling efficient recycling of fiber components from retired wind turbine blades.

[0035] To achieve the above technical solution, such as Figure 1 As shown, an embodiment of the present invention provides a wind turbine blade resource recycling system, including a feeder 1, a feed sealer 2, a feed conveyor 3, a pyrolysis reactor 4, a discharger 5, a discharge sealer 6, a discharge conveyor 7, an oxidation device 8, a cooling conveyor 9, and a sealing unloader 10. The material inlets and outlets at both ends of the mechanisms 1 to 9 are connected sequentially from left to right, wherein:

[0036] The feeder 1 includes a roller conveyor 11 and a first curtain 12. The roller conveyor 11 is located at the bottom of the feeder 1 and is used to support and convey the fan blades. The first curtain 12 is a strip structure woven from aluminum silicate fiber and is located at the material inlet and outlet at both ends of the feeder 1, and can swing freely.

[0037] The feeding sealing machine 2 includes a feeding drive shaft 21, an air cushion layer 22, a heat insulation layer 23, a friction layer 24, a nitrogen filling port 25, and a feeding roller 26. The feeding drive shaft 21, the air cushion layer 22, the heat insulation layer 23, and the friction layer 24 are concentrically bonded to form a sealing roller shaft. The air cushion layer 22 is filled with compressed inert gas, and the thickness of the air cushion layer 22 after being filled with gas is controlled to be 0.5 μm. Two identical sealing roller shafts are in contact vertically to form a pair of sealing rollers. Two identical pairs of sealing rollers are arranged horizontally 2 m apart. The feeding roller 26 is arranged in the middle of the two pairs of sealing rollers. The nitrogen filling port 25 is arranged below the feeding roller 26.

[0038] The pyrolysis reactor 4 is a box structure, including a first heating tube 41, a gas outlet 42, a rotary chain conveyor 43, a slag storage bin 44, and a purge port 45. The rotary chain conveyor 43 is arranged in the middle of the box of the pyrolysis reactor 4, with its left end facing the discharge port of the feed conveyor 3 and its right end facing the feed port of the discharge machine 5. Multiple sets of the first heating tubes 41 are arranged parallel to each other above and in the middle of the rotary chain conveyor 43. The gas outlet 42 is located on the upper right of the box of the pyrolysis reactor 4, the purge port 45 is located on the lower left of the box, and the slag storage bin 44 is located on the lower right.

[0039] The discharge sealing machine 6 includes a discharge drive shaft 61, a shaft spring mechanism 62, a movable cover plate 63, a cover plate spring mechanism 64, a fixed cover plate 65, a nitrogen inlet 66, and a discharge roller 67. Stainless steel rollers are concentrically arranged on the outer side of the discharge drive shaft 61 to form a sealing roller shaft. Two sealing roller shafts are arranged vertically opposite each other to form a pair of sealing rollers. Two pairs of identical sealing rollers are arranged horizontally at 2m intervals. The upper two sealing roller shafts are connected to the movable cover plate 63. The shaft spring mechanism 62 connects the upper two discharge drive shafts 61 and the movable cover plate 63 to form a movable sealing roller shaft. The cover plate spring mechanism 64 connects the movable cover plate 63 and the fixed cover plate 65. The initial distance between the movable cover plate 63 and the fixed cover plate 65 is set to 0.3m. The discharge roller 67 is arranged between the two pairs of sealing rollers, and the nitrogen inlet 66 is arranged below the discharge roller 67.

[0040] The oxidation device 8 includes a second feed inlet 81, a second heating tube 82, a flue gas outlet 83, a rotary grate 84, an air distribution system 85, a cleaning port 86, and a storage bin 87. The oxidation device 8 adopts a box structure. The rotary grate 84 is arranged in the middle of the box. The left end of the rotary grate 84 is provided with a first feed inlet connected to the discharge port of the discharge machine 5. The second feed inlet 81 is vertically located above the left end of the rotary grate. Multiple sets of parallel second heating tubes 82 are arranged on the right side of the second feed inlet 81. The flue gas outlet 83 is located on the right side of the heating tubes 82. The air distribution system 85 is located in the middle gap of the rotary grate. The cleaning port 86 is located on the lower left side of the box. The storage bin 87 is located on the lower right side of the box.

[0041] The cooling conveyor 9 includes an air inlet 91, an air outlet 92, a falling channel 93, an isolation curtain 94, and a roller moving mechanism 95. The roller moving mechanism 95 is horizontally arranged behind the rotary grate 84. The isolation curtain 94 is provided at the feed inlet of the cooling conveyor 9. The air inlet 91 is provided on the right side of the isolation curtain. The air outlet 92 is provided on the upper right side of the cooling conveyor. The falling channel 93 is located below the air outlet 92. The width of the falling channel is set to 1.5m and the height is set to 2m. The bottom of the falling channel 93 is connected to the sealed unloader 10.

[0042] The feeding conveyor 3, discharging conveyor 5, and discharging conveyor 7 can all employ roller conveying devices with the same structure, and each can have a second curtain at both ends. This second curtain is woven from at least one of asbestos fiber or aluminum silicate fiber and can swing freely.

[0043] The specific usage method of the above-mentioned wind turbine blade resource recycling system includes the following steps:

[0044] Step 1: Turn on the first heating tube 41 and the second heating tube 82 to preheat the pyrolysis reactor 4 to 500°C and the oxidation device 8 to 550°C.

[0045] Step 2: Turn on the feed sealing machine 2 and the discharge sealing machine 6, and introduce nitrogen into them until the pressure reaches 1.0 kPa;

[0046] Step 3: Activate all mechanical moving parts, add a fan blade with dimensions of 1.8m×1.5m×0.1m to the feeder 1, and under the drive of the roller, the fan blade moves from left to right, passing through the temperature-controlled pyrolysis and low-temperature combustion processes in sequence, and finally enters the cooling conveyor 9 to cool down, and is discharged from the sealed unloader 10 to obtain the fiber;

[0047] Step 4: At regular intervals, compressed nitrogen and air are introduced through the purge port 26 and the cleaning port 86 to clean the pyrolysis reactor 4 and the oxidation device 8 respectively, and the solids in the slag storage bin 44 and the material storage bin 87 are cleaned and sent to the oxidation device 8 through the second feed port 81 for reprocessing.

[0048] The wind turbine blade resource recycling system of the present invention overcomes the problem of low bulk density of large-sized materials and easy air mixing during the feeding process by using a feeder, a feed sealer and a feed conveyor set up upstream of the pyrolysis reactor. In particular, it utilizes the compressible air roller shaft formed by the feed sealing roller with an air cushion layer of the feed sealer, in conjunction with nitrogen purging, to perform sealed feeding, thereby realizing the sealed feeding of large-sized wind turbine blades.

[0049] Furthermore, a discharge sealing machine is installed between the pyrolysis reactor and the oxidation unit. The material is discharged through a movable sealing roller with a variable roller spacing, which achieves complete isolation between the atmosphere of the pyrolysis unit and the oxidation unit. This completely isolates the oxygen-free atmosphere of the pyrolysis unit and the oxygen-rich atmosphere of the oxidation unit, and allows for temperature-controlled pyrolysis and low-temperature oxidation processes in conjunction with the material. This enables high-quality recycling of the fiber components of the wind turbine blades, and has the advantages of continuous processing, low energy consumption, and high efficiency.

[0050] The pyrolysis reactor used in this invention has a rotary chain conveyor capable of supporting the mobile pyrolysis of large-sized fan blades, and heats the material through scientifically arranged heating tubes, achieving precise temperature control in the pyrolysis process. The oxidation device, through scientifically arranged heating tubes and air distribution system, can achieve low-temperature combustion of pyrolysis residue, ensuring that the pyrolysis carbon residue is completely burned off and the fiber recovery quality is high.

[0051] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered to fall within the protection scope of the present invention.

Claims

1. A wind turbine blade resource recovery system, characterized in that, The device comprises a feeder (1), a feeding sealing machine (2), a feeding conveyor (3), a pyrolysis reactor (4), a discharging machine (5), a discharging sealing machine (6), a discharging conveyor (7) and an oxidation device (8) arranged in sequence and connected with each other, wherein: The feeder (1) comprises a carrier roller conveying device (11) for supporting and conveying the fan blades and a first door curtain (12) arranged at the inlet and outlet of the feeder (1) respectively; The feeding sealing machine (2) comprises a feeding sealing machine shell, a pair of feeding sealing roller groups arranged in the feeding sealing machine shell in horizontal interval and a feeding carrier roller (26) arranged between the feeding sealing roller groups, each of the feeding sealing roller groups comprises a pair of feeding sealing rollers with their shafts on the same vertical line and their outer walls abutting each other, each of the feeding sealing rollers comprises a feeding transmission shaft (21), an air cushion layer (22), a heat insulation layer (23) and a friction layer (24) connected concentrically from inside to outside, the feeding sealing machine shell is provided with a nitrogen filling port (25), and the height of the top of the feeding carrier roller (26) is consistent with the height of the abutting points of the feeding sealing roller groups; The pyrolysis reactor (4) has a temperature-controlled pyrolysis box body and comprises a rotary chain plate machine (43) arranged in the temperature-controlled pyrolysis box body, one end of the rotary chain plate machine (43) is opposite to the discharge port of the feeding conveyor (3), and the other end is opposite to the inlet of the discharging machine (5); a plurality of groups of first heating pipes (41) arranged in parallel with each other are arranged in the upper part and the surrounding intermediate space of the rotary chain plate machine (43), the upper part of the end of the temperature-controlled pyrolysis box body close to the discharging machine (5) is provided with a gas outlet (42), the lower part of the end close to the discharging machine (5) is provided with a residue storage bin (44), and the lower part of the end close to the feeding conveyor (3) is provided with a purging port (45); The discharging sealing machine (6) comprises a discharging sealing machine shell, a pair of discharging sealing roller groups arranged in the discharging sealing machine shell in horizontal interval and a discharging carrier roller (67) arranged between the discharging sealing roller groups, each of the discharging sealing roller groups comprises a pair of discharging sealing rollers with their shafts on the same vertical line and their outer walls abutting each other, each of the discharging sealing rollers comprises a discharging transmission shaft (61) and a stainless steel roller cylinder arranged concentrically outside the discharging transmission shaft (61), the discharging sealing machine shell comprises a movable cover plate (63) and a fixed cover plate (65) connected by a cover plate spring mechanism (64) arranged above the discharging sealing roller groups, the discharging sealing roller on the upper part of the discharging sealing roller groups is connected to the movable cover plate (63) through an axle spring mechanism (62) connected between the discharging transmission shaft (61) of the discharging sealing roller and the movable cover plate (63), and the discharging sealing machine shell is provided with a nitrogen inlet (66), and the height of the top of the discharging carrier roller (67) is consistent with the height of the abutting points of the discharging sealing roller groups; The oxidation device (8) has an oxidation box and comprises a rotary grate (84) arranged in the oxidation box, one end of the rotary grate (84) being provided with a first feeding port connected with a discharging port of the discharging conveyor (7), a vertical second feeding port (81) being arranged above a feeding end of the discharging conveyor (7), a cleaning port (86) being arranged below the feeding end of the discharging conveyor (7), a flue gas outlet (83) being arranged above a far end of the discharging conveyor (7), and a storage bin (87) being arranged below the far end of the discharging conveyor (7), a plurality of groups of second heating pipes (82) being arranged above the rotary grate (84) and parallel to each other between the second feeding port (81) and the flue gas outlet (83), and an air distribution system (85) being arranged in a middle gap surrounded by the rotary grate (84).

2. The wind turbine blade resource recovery system of claim 1, wherein, The device further comprises a cooling conveyor (9) connected to the far end of the oxidation device (8) away from the discharging conveyor (7), the cooling conveyor (9) comprising an air inlet (91), an air outlet (92), a falling channel (93), a partition curtain (94), and a roller moving mechanism (95), the roller moving mechanism (95) being horizontally arranged behind the rotary grate (84), the air inlet (91) and the air outlet (92) being arranged above the roller moving mechanism (95) and spaced apart from each other along a conveying direction of the roller moving mechanism (95), and the falling channel (93) being arranged below the air outlet (92) and connected with a sealed discharger (10).

3. The wind turbine blade resource recovery system of claim 1, wherein, Each of the feeding conveyor (3), the discharging machine (5), and the discharging conveyor (7) is provided with a second curtain at each end thereof, the second curtain being woven from at least one of asbestos fibers or aluminum silicate fibers.

4. The wind turbine blade resource recovery system of claim 1, wherein, The thickness of the air cushion layer (22) is 0.3-0.6 m.

5. The wind turbine blade resource recovery system of claim 1, wherein, The horizontal distance between the feeding roller (26) and the feeding drive shaft (21) is 0.6-1.2 m.

6. The wind turbine blade resource recovery system of claim 1, wherein, The minimum distance between the movable cover plate (63) and the fixed cover plate (65) is 0.3-0.5 m.

7. The method of using a fan blade resource recovery system according to any one of claims 1-6, wherein, The method comprises the following steps: Step 1, turning on the first heating pipes (41) and the second heating pipes (82), and preheating the pyrolysis reactor (4) and the oxidation device (8) to a set pyrolysis temperature and oxidation temperature, respectively; Step 2, turning on the feeding sealing machine (2) and the discharging sealing machine (6), and introducing nitrogen into the feeding sealing machine housing and the discharging sealing machine housing until the pressure reaches 1-3 kPa; Step 3, turning on all the mechanical moving parts, adding the fan blades to be treated to the feeding machine (1), and making the fan blades undergo a temperature-controlled pyrolysis process in the pyrolysis reactor (4) and a combustion process in the oxidation device (8) in sequence, cooling the generated solid residues, and discharging the obtained fibers. Step 4, every time interval, compressed nitrogen and air are respectively introduced into the pyrolysis reactor (4) and the oxidation device (8) from the purge port (45) and the purge port (86) to clean the pyrolysis reactor (4) and the oxidation device (8), clean the solid in the residue storage bin (44) and the material storage bin (87), and send the solid from the second feeding port (81) into the oxidation device (8) for reprocessing.

8. The method of using a fan blade resource recovery system of claim 7, wherein, The fan blade to be processed added in step 3 refers to a fan blade with a size of 1.5m×1.5m×0.05m-2.0m×2.0m×0.1m.

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