A system and method for whole-blade processing of decommissioned wind turbine blades

Abstract

This invention provides a system and method for processing decommissioned wind turbine blades. The system includes at least one reactor capable of accommodating a single decommissioned wind turbine blade. Multiple external pipes surround the reactor, and a concrete shell surrounds these pipes. A cover plate is located at the top of the reactor, and hooks for securing the top of the decommissioned wind turbine blades are located at the bottom of the cover plate. The reactor is connected to a heating pipe, and a support frame for holding the lower part of the decommissioned wind turbine blades is located inside the reactor. A reaction product outlet is located at the bottom of the reactor. This system and method for processing decommissioned wind turbine blades enables the recycling of long fibers from decommissioned wind turbine blades, increasing the recycling value of the recovered materials.

Description

Technical Field

[0001] This invention relates to the field of solid waste treatment technology, and in particular to a system and method for whole-piece treatment of decommissioned wind turbine blades. Background Technology

[0002] Wind turbine blades are the core components of wind turbines, primarily made of fiberglass, carbon fiber, and thermosetting resins, while also containing small amounts of metal, epoxy structural adhesives, and paint. As a batch of wind turbine blades nears the end of their lifespan and wind turbine products are being upgraded, an increasing number of wind turbine blades require clean recycling.

[0003] Currently, methods for processing old wind turbine blades include physical recycling, incineration, pyrolysis, and dissolution. These existing methods typically involve cutting and crushing the blades, which has the advantage of utilizing existing equipment or modifying existing equipment, resulting in low modification costs. However, the shortened fiber length after cutting significantly reduces its recycling value, limiting its use to applications such as building reinforcement and fuel.

[0004] Wind turbine blades are quite long. If the long fibers of the blades can be recycled as a whole without being shredded, they can be directly reprocessed into other high-value civilian products. For example, carbon fiber can be used as a structural material for kayaks and bicycles. Compared with recycling after crushing, this can greatly increase its recycling value.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a whole-piece processing system and method for decommissioned wind turbine blades, which can recycle and reuse long fibers in decommissioned wind turbine blades, thereby increasing the recycling value of the recycled materials.

[0007] This invention provides a whole-piece decommissioned wind turbine blade processing system, including at least one reactor capable of accommodating a whole decommissioned wind turbine blade, multiple outer casing pipes surrounding the reactor, a concrete shell surrounding the multiple outer casing pipes, a cover plate at the top of the reactor, a hook at the bottom of the cover plate for hooking the top of the decommissioned wind turbine blade, a heating pipe connected to the inside of the reactor, a bracket for supporting the lower part of the decommissioned wind turbine blade inside the reactor, and a reaction product discharge port at the bottom of the reactor.

[0008] Furthermore, the cover plate is equipped with sealing gaskets, fasteners, temperature and pressure measuring devices, and an exhaust port. The cover plate and the reactor are sealed together by the sealing gaskets and fasteners.

[0009] Furthermore, the decommissioned wind turbine blade whole-piece processing system of the present invention also includes a buffer, the inlet end of which is connected to the reaction product outlet, and a valve is provided between the buffer and the reaction product outlet.

[0010] Furthermore, the buffer is equipped with an exhaust pipe and a reuse pipe, the reuse pipe being connected to an external pipe, and valves are provided on the exhaust pipe and the reuse pipe respectively.

[0011] Furthermore, the decommissioned wind turbine blade whole-piece processing system of the present invention also includes a collection tank, which is connected to the outlet end of the buffer, and a valve is provided between the collection tank and the buffer.

[0012] This invention also provides a method for processing decommissioned wind turbine blades as a whole. The method uses the aforementioned decommissioned wind turbine blade processing system to process the decommissioned wind turbine blades, and includes the following steps:

[0013] S1: Load the entire decommissioned fan blade into the reactor, fix the entire decommissioned fan blade with hooks and brackets, and then cover it with a cover plate;

[0014] S2: Perform steam pyrolysis, hydrolysis, nitrogen pyrolysis, or supercritical hydrolysis on the entire retired wind turbine blade.

[0015] In step S2, steam pyrolysis may include: introducing high-temperature steam into an external pipeline, and simultaneously introducing water vapor into the reactor through a heating pipe, and performing steam pyrolysis on the entire decommissioned wind turbine blade in the presence of a catalyst; wherein the temperature during steam pyrolysis is controlled at 200-550℃ and the time is 60-80min; there are no strict restrictions on the catalyst used in steam pyrolysis and its setting method, and the catalyst may be, for example, a mixture of aluminum chloride, potassium chloride and titanium dioxide in a mass ratio of 0.5:0.5:0.5, which can be uniformly sprayed onto the entire decommissioned wind turbine blade after mixing, with a spray thickness of 1mm.

[0016] In step S2, hydrolysis may include: introducing hot water into the reactor through a heating pipe to hydrolyze the entire decommissioned wind turbine blade in the presence of a catalyst; wherein the hydrolysis temperature is controlled at 190-350℃, the pressure at 1-2.5MPa, and the time at 10-24h. The catalyst used in the hydrolysis may be K2[Co(SO4)2], etc., and the catalyst may be mixed with hot water and then introduced into the reactor through the heating pipe; the catalyst mass content may be 6-14%. In addition, the introduction of high-temperature steam or hot water into the external pipe may be determined according to the reactor temperature; for example, when the reactor temperature drops, high-temperature steam or hot water may be introduced into the external pipe to maintain a stable reactor temperature and ensure the hydrolysis temperature; when the reactor is well insulated, it is not necessary to introduce high-temperature steam or hot water into the external pipe.

[0017] In step S2, nitrogen pyrolysis may include: introducing nitrogen gas into the reactor through a heating pipe, and simultaneously introducing high-temperature nitrogen gas into an external pipe, to perform nitrogen pyrolysis on the entire decommissioned wind turbine blade in the presence of a catalyst; wherein the temperature during nitrogen pyrolysis is controlled at 800-1500℃ and the time is 60-200 min. The catalyst used in nitrogen pyrolysis can be any one of alumina, calcium oxide, or calcium hydroxide.

[0018] In step S2, supercritical hydrolysis may include: introducing supercritical water into the reactor through a heating pipe, and performing supercritical hydrolysis on the entire decommissioned wind turbine blade in the presence of a catalyst; wherein the temperature during supercritical hydrolysis is controlled at 370-400℃, the pressure at 22-30MPa, and the time at 40-240min. The catalyst used in supercritical hydrolysis may be acetone, and the volume ratio of supercritical water to acetone may be 8:2.

[0019] The decommissioned wind turbine blade whole-piece processing system and method of the present invention can process whole decommissioned wind turbine blades to obtain long fibers with high recycling value. In particular, the reactor of the present invention is suitable for various forms of blade reaction, such as hydrolysis, steam pyrolysis, nitrogen pyrolysis, and supercritical hydrolysis. The processing system can be equipped with multiple reactors to process multiple whole decommissioned wind turbine blades simultaneously, greatly improving blade processing efficiency. In addition, by setting up external pipelines to heat and cool the reactor, the reaction between clean steam and blades is reduced, ensuring rapid reuse of clean steam. At the same time, steam and water in each process stage can be recycled, saving energy. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A top view of a decommissioned wind turbine blade whole-piece processing system according to one embodiment;

[0022] Figure 2 This is a front view of a decommissioned wind turbine blade whole-piece processing system according to one embodiment.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1: Reactor; 2: External piping; 3: Concrete shell; 4: Cover plate; 5: Hook; 6: Heating pipe; 7: Bracket; 8: Reaction product outlet; 9: Fastener; 10: Temperature and pressure measuring device; 11: Exhaust port; 12: Buffer; 13: Exhaust pipe; 14: Reuse pipe; 15: Collection tank; 16: Decommissioned fan blades. Detailed Implementation

[0025] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form includes the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this description, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] Combination Figure 1 , Figure 2 As shown, the decommissioned wind turbine blade whole-piece processing system of this embodiment includes at least one reactor 1 capable of accommodating a whole decommissioned wind turbine blade 16 (hereinafter referred to as blade). Multiple outer casing pipes 2 are provided around the reactor 1. A concrete shell 3 is provided outside the multiple outer casing pipes 2. A cover plate 4 is provided on the top of the reactor 1. A hook 5 for hooking the top of the decommissioned wind turbine blade 16 is provided at the bottom of the cover plate 4. The reactor 1 is connected to a heating pipe 6. A bracket 7 for supporting the lower part of the decommissioned wind turbine blade 16 is provided inside the reactor 1. A reaction product discharge port 8 is provided at the bottom of the reactor 1.

[0030] Reactor 1 is the site where the decommissioned wind turbine blade 16 undergoes a reaction; it is understood that reactor 1 should have a reaction chamber capable of accommodating the entire decommissioned wind turbine blade 16. A bracket 7 is provided inside reactor 1 to support the lower part of the decommissioned wind turbine blade 16; a reaction product outlet 8 is provided at the part of reactor 1 to discharge the reaction products. The number of reactors 1 is not strictly limited; multiple reactors 1 can be set at intervals according to actual needs to simultaneously process multiple entire decommissioned wind turbine blades 16, thereby improving blade processing efficiency; in this embodiment, four reactors 1 are set, symmetrically arranged vertically and horizontally.

[0031] The cover plate 4 is used to seal the top of the reactor 1. Specifically, the cover plate 4 is provided with a sealing gasket, fasteners 9, a temperature and pressure measuring device 10, and an exhaust port 11. The cover plate 4 is sealed to the reactor 1 by the sealing gasket and fasteners 9, such as bolts and nuts. The exhaust port 11 is used for venting air, and the temperature and pressure measuring device 10 is used to detect the temperature and pressure parameters inside the reactor 1. In addition, the bottom of the cover plate 4 has hooks 5, which are used to hook unreacted blades before the reaction and unreacted fibers after the reaction.

[0032] The outer pipe 2 is mainly used to heat or cool the reactor 1, thereby reducing the reaction between clean steam and the blades, ensuring the rapid reuse of clean steam, and reducing energy loss. The reason for maintaining a stable temperature in reactor 1 by introducing steam into the outer pipe 2 instead of the heating pipe 6 is that steam has varying degrees of cleanliness. Steam generators require clean water or low-pressure steam to produce high-temperature, high-pressure steam. If the water or low-pressure steam contains impurities or has high hardness, it can lead to scaling in the steam generator, pipe blockage, and even safety issues. When steam comes into contact with the blades, it carries impurities generated by the blades, requiring purification, filtration, and desalination before reuse. However, the steam in the outer pipe 2 does not come into contact with the blades and can therefore be reused directly.

[0033] There are no strict restrictions on the arrangement of the external pipes 2; for example, multiple external pipes 2 can be installed around the outside of the reactor 1. In addition, a concrete shell 3 is provided outside the multiple external pipes 2. The concrete shell 3 serves to reinforce the reactor 1 and provide insulation, while also reducing the explosion hazard caused by the pressure vessel explosion.

[0034] The decommissioned wind turbine blade whole-piece processing system of this embodiment also includes a buffer 12, the inlet end of which is connected to the reaction product outlet 8, and a valve is provided between the buffer 12 and the reaction product outlet 8. An exhaust pipe 13 and a reuse pipe 14 are provided on the buffer 12, the reuse pipe 14 being connected to the outer casing pipe 2, and valves are respectively provided on the exhaust pipe 13 and the reuse pipe 14. Furthermore, the decommissioned wind turbine blade whole-piece processing system of this embodiment also includes a collection tank 15, which is connected to the outlet end of the buffer 12, and a valve is provided between the collection tank 15 and the buffer 12.

[0035] The buffer 12 is used to store the reaction products. The products are discharged from the reactor 1 at high temperature and high pressure. After being cooled and depressurized in the buffer 12, they are discharged into the collection tank 15, which is used to store the reaction products at normal temperature and pressure. The buffer 12 is equipped with an exhaust pipe 13 and a reuse pipe 14. The reuse pipe 14 is connected to the outer pipe 2, so that steam and water can be recycled.

[0036] This embodiment does not impose strict restrictions on the materials used for parts and pipes. For example, high-temperature and high-pressure resistant alloy steels such as T92, P92, and high-temperature resistant stainless steel can be used.

[0037] The decommissioned wind turbine blade whole-piece processing system and method of this embodiment can process whole decommissioned wind turbine blades 16 to obtain long fibers with high recycling value. In particular, the reactor 1 is suitable for various forms of blade reaction such as hydrolysis, steam pyrolysis, nitrogen pyrolysis, and supercritical hydrolysis. The processing system can be equipped with multiple reactors 1, thereby processing multiple whole decommissioned wind turbine blades 16 simultaneously, which greatly improves the blade processing efficiency. In addition, by setting up an external pipeline 2 to heat up and cool down the reactor 1, the reaction between clean steam and blades is reduced, ensuring the rapid reuse of clean steam. At the same time, the steam and water in each process stage can be recycled, saving energy.

[0038] Example 2

[0039] This embodiment provides a method for whole-blade treatment of decommissioned wind turbine blades. The whole-blade treatment system of Example 1 is used to perform steam pyrolysis on the decommissioned wind turbine blades. The catalyst used in the steam pyrolysis is a mixture of aluminum chloride, potassium chloride, and titanium dioxide in a mass ratio of 0.5:0.5:0.5. After mixing, the mixture is uniformly sprayed onto the entire decommissioned wind turbine blade with a coating thickness of 1 mm. The steam pyrolysis steps are as follows:

[0040] 1) Install the blade: Open the cover plate 4, place the whole decommissioned blower blade 16 after the catalyst is sprayed on the bracket 7, and hook the blade with the hook 5; then seal the cover plate 4 and tighten the fastener 9 to ensure that the reactor 1 does not leak.

[0041] 2) Introduce steam: Close the valve at the outlet 8 of the reaction product and introduce high-temperature steam into the outer pipe 2. At the same time, introduce water steam into the reactor 1 through the heating pipe 6 to keep the temperature of the reactor 1 at 550℃ and the pressure at atmospheric pressure.

[0042] 3) Steam pyrolysis: After the temperature inside the reactor 1 stabilizes, the heating pipe 6 is turned off, and the decommissioned fan blades 16 are subjected to steam pyrolysis for 20 minutes. During the steam pyrolysis process, the temperature inside the reactor 1 is detected by the temperature and pressure measuring device 10. If the temperature of the reactor 1 decreases, high-temperature steam is continued to be introduced into the outer pipe 2 to maintain the temperature stability inside the reactor 1.

[0043] 4) Product discharge stage: After the steam pyrolysis reaction is completed, close the valves at the exhaust pipe 13 and the reuse pipe 14, open the valve at the reaction product discharge port 8 to allow the reaction product to flow into the buffer 12, and then close the valve at the reaction product discharge port 8.

[0044] 5) De-temperature and pressure reduction stage: Open the valve at reuse pipe 14 and set the pressure at around 0.2MPa. When opened, secondary steam will be produced and can be used for other purposes. Then, close the valve at reuse pipe 14 and open the valve at exhaust pipe 13 to further reduce the pressure of buffer 12 to atmospheric pressure.

[0045] 6) Product collection stage: Open the valve at the bottom of the buffer 12 to discharge the reaction product into the collection tank 15, and then close the valve to collect the product in the collection tank 15.

[0046] 7) Reactor cooling stage: Circulating cooling water is introduced into the external pipe 2 to cool down reactor 1.

[0047] 8) Residual liquid discharge stage: After the temperature and pressure of reactor 1 drop to normal temperature and pressure, open the valve at the reaction product outlet 8 and the valve at the bottom of the buffer 12, and discharge the condensate from reactor 1 into the collection tank 15 for recycling.

[0048] 9) Fiber collection: Open the cover plate 4, collect the long fibers after the reaction on the hook 5, and start a new cycle.

[0049] Testing showed that the strength retention rate of the long fibers recovered in this embodiment was over 90%.

[0050] Example 3

[0051] This embodiment provides a method for whole-blade processing of decommissioned wind turbine blades. The whole-blade processing system for decommissioned wind turbine blades from Embodiment 1 is used to hydrolyze the decommissioned wind turbine blades. The steps are as follows:

[0052] 1) Install the blade: Open the cover plate 4, place the entire retired fan blade 16 onto the bracket 7, and hook the blade with the hook 5; then seal the cover plate 4 and tighten the fasteners 9 to ensure that the reactor 1 does not leak.

[0053] 2) Introduce hot water: Inject a mixture of hot water and catalyst K2[Co(SO4)2] into reactor 1 through heating pipe 6. The mass fraction of the catalyst is 10%. The mixture should cover the entire retired fan blade 16. Maintain the temperature of reactor 1 at about 200℃ and the pressure at 1.5 MPa.

[0054] 3) Hydrolysis: After ensuring the temperature and pressure inside reactor 1 are stable, shut off heating pipe 6 and hydrolyze the decommissioned fan blades 16 for 16 hours. During the hydrolysis process, if the temperature inside reactor 1 drops, high-temperature steam can be introduced into the external pipe 2 to maintain the temperature stability of reactor 1.

[0055] 4) Product discharge stage: After the reaction is completed, close the valves at the exhaust pipe 13 and the reuse pipe 14, open the valve at the reaction product discharge port 8 to allow the reaction product to flow into the buffer 12, and then close the valve at the reaction product discharge port 8.

[0056] 5) De-temperature and pressure reduction stage: Open the valve at reuse pipe 14 and set the pressure at around 0.2MPa. When opened, secondary steam will be produced and can be used for other purposes. Then, close the valve at reuse pipe 14 and open the valve at exhaust pipe 13 to further reduce the pressure of buffer 12 to atmospheric pressure.

[0057] 6) Product collection stage: Open the valve at the bottom of the buffer 12 to discharge the reaction product into the collection tank 15, and then close the valve to collect the product in the collection tank 15.

[0058] 7) Cooling stage of reactor 1: Circulating cooling water is introduced into the external pipe 2 to cool down reactor 1.

[0059] 8) Residual liquid discharge stage: After the temperature and pressure of reactor 1 drop to normal temperature and pressure, open the valve at the reaction product outlet 8 and the valve at the bottom of the buffer 12, and discharge the condensate from reactor 1 into the collection tank 15 for recycling.

[0060] 9) Fiber collection: Open the cover plate 4, collect the long fibers after the reaction on the hook 5, and start a new cycle.

[0061] The long fibers recovered in this embodiment have virtually no defects or residual impurities on their surface and can be reused.

[0062] Example 4

[0063] This embodiment provides a method for whole-blade processing of decommissioned wind turbine blades. The whole-blade processing system of decommissioned wind turbine blades in Embodiment 1 is used to perform nitrogen pyrolysis on the decommissioned wind turbine blades. The steps are as follows:

[0064] 1) Install the blade: Open the cover plate 4, place the entire retired fan blade 16 onto the bracket 7, and hook the blade with the hook 5; then seal the cover plate 4 and tighten the fasteners 9 to ensure that the reactor 1 does not leak.

[0065] 2) Introduce nitrogen: Close the valve at the product outlet 8, and introduce nitrogen and alumina catalyst into reactor 1 through heating pipe 6. At the same time, introduce high-temperature nitrogen into the outer casing pipe 2 to maintain the temperature of reactor 1 at 1000℃ and the pressure at atmospheric pressure.

[0066] 3) Nitrogen pyrolysis: After the temperature in reactor 1 stabilizes, turn off the heating tube 6 and perform nitrogen pyrolysis on the decommissioned fan blades 16. The steam pyrolysis time is 70 minutes.

[0067] 4) Cooling: After the nitrogen pyrolysis reaction is completed, cooling water is introduced into the outer pipe 2 to cool the reactor 1 to room temperature.

[0068] 5) Open exhaust port 11 to discharge the mixture of pyrolysis gas and nitrogen gas for subsequent decomposition process.

[0069] 6) Open the valves at the reaction product outlet 8 and the buffer 12 to discharge the reaction product and collect it in the collection tank 15.

[0070] 7) Fiber collection: Open the cover plate 4, collect the long fibers after the reaction on the hook 5, and start a new cycle.

[0071] Example 5

[0072] This embodiment provides a method for whole-blade processing of decommissioned wind turbine blades. The decommissioned wind turbine blade whole-blade processing system of Embodiment 1 is used to perform supercritical hydrolysis on the decommissioned wind turbine blades. The steps are as follows:

[0073] 1) Install the blade: Open the cover plate 4, place the entire retired fan blade 16 onto the bracket 7, and hook the blade with the hook 5; then seal the cover plate 4 and tighten the fasteners 9 to ensure that the reactor 1 does not leak.

[0074] 2) Introducing supercritical water: Supercritical water and acetone catalyst are introduced into reactor 1 through heating pipe 6. The volume ratio of supercritical water to acetone is 8:2, so that the supercritical water covers the entire retired fan blade 16, and the temperature of reactor 1 is maintained at about 374℃ and the pressure is maintained at 22MPa.

[0075] 3) Supercritical hydrolysis: After ensuring that the temperature and pressure in reactor 1 are stable, shut off heating tube 6 and perform supercritical hydrolysis on the decommissioned fan blades. The supercritical hydrolysis time is 60 minutes.

[0076] 4) Product discharge stage: After the supercritical hydrolysis reaction is completed, close the valves at the exhaust pipe 13 and the reuse pipe 14, open the valve at the reaction product discharge port 8 to allow the reaction product to flow into the buffer 12, and then close the valve at the reaction product discharge port 8.

[0077] 5) De-temperature and pressure reduction stage: Open the valve at reuse pipe 14 and set the pressure at around 0.2MPa. When opened, secondary steam will be produced and can be used for other purposes. Then, close the valve at reuse pipe 14 and open the valve at exhaust pipe 13 to further reduce the pressure of buffer 12 to atmospheric pressure.

[0078] 6) Product collection stage: Open the valve at the bottom of the buffer 12 to discharge the reaction product into the collection tank 15, and then close the valve to collect the product in the collection tank 15.

[0079] 7) Cooling stage of reactor 1: Circulating cooling water is introduced into the external pipe 2 to cool down reactor 1.

[0080] 8) Residual liquid discharge stage: After the temperature and pressure of reactor 1 drop to normal temperature and pressure, open the valve at the reaction product outlet 8 and the valve at the bottom of the buffer 12, and discharge the condensate from reactor 1 into the collection tank 15 for recycling.

[0081] 9) Fiber collection: Open the cover plate 4, collect the long fibers after the reaction on the hook 5, and start a new cycle.

[0082] The long fibers recovered in this embodiment have good properties and can be reused.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for whole-blade processing of decommissioned wind turbine blades, characterized in that, A whole-blade decommissioned wind turbine blade processing system is used to process decommissioned wind turbine blades. The system includes four reactors capable of accommodating whole decommissioned wind turbine blades, arranged symmetrically in all directions. Multiple external pipes surround the reactors, and a concrete shell surrounds these pipes. A cover plate is installed on the top of the reactor, with hooks at the bottom for holding the top of the decommissioned wind turbine blades. The reactor interior is connected to a heating pipe. A support frame is installed inside the reactor to hold the lower part of the decommissioned wind turbine blades. A reaction product outlet is located at the bottom of the reactor. The system also includes a buffer and a collection tank. The inlet of the buffer is connected to the reaction product outlet, and a valve is installed between the buffer and the outlet. An exhaust pipe and a reuse pipe are installed on the buffer, connected to the external pipes. Valves are installed on both the exhaust pipe and the reuse pipe. The collection tank is connected to the outlet of the buffer, and a valve is installed between the collection tank and the buffer. The method for treating retired wind turbine blades as a whole includes the following steps: S1: Load the entire decommissioned fan blade into the reactor, fix the entire decommissioned fan blade with hooks and brackets, and then cover it with a cover plate; S2: Perform steam pyrolysis or hydrolysis on the entire decommissioned wind turbine blade; Steam pyrolysis includes: introducing high-temperature steam into an external pipeline, and simultaneously introducing water vapor into the reactor through a heating pipe; and performing steam pyrolysis on the entire decommissioned wind turbine blade in the presence of a catalyst. The catalyst used in the steam pyrolysis is a mixture of aluminum chloride, potassium chloride, and titanium dioxide in a mass ratio of 0.5:0.5:0.5, which is then uniformly sprayed onto the entire decommissioned wind turbine blade with a coating thickness of 1 mm. The temperature during steam pyrolysis is controlled at 550 ℃, the pressure at atmospheric pressure, and the time at 20 min. Hydrolysis includes: introducing a mixture of hot water and catalyst K2[Co(SO4)2] into the reactor through a heating pipe, with the catalyst having a mass fraction of 10%, and hydrolyzing the entire decommissioned wind turbine blade in the presence of the catalyst; wherein the temperature during hydrolysis is controlled at 200 ℃, the pressure at 1.5 MPa, and the time at 16 h.

2. The method for whole-blade processing of decommissioned wind turbine blades according to claim 1, characterized in that, The cover plate is equipped with sealing gaskets, fasteners, temperature and pressure measuring devices, and an exhaust port. The cover plate is sealed to the reactor through sealing gaskets and fasteners.

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