A shredding and recycling system and method for decommissioned wind turbine blades

Abstract

The application provides a crushing and recycling system and method for decommissioned wind power blades, the system comprising a cutting and removing device, a heat treatment kiln, a coarse crusher, a fine crusher, a sorting device, a pulverizer, a screening device and a conveying system, and the method comprising the steps of removing metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening and resource utilization. The crushing and recycling system and method for decommissioned wind power blades can realize efficient crushing and recycling of decommissioned blades, and through heat pretreatment of the blades, the strength of the blade material is significantly reduced, thereby greatly reducing the difficulty and energy consumption of crushing, and solving the key problem of blade recycling and utilization.

Description

Technical Field

[0001] This invention belongs to the field of material recycling, specifically relating to a crushing and recycling system and method for retired wind turbine blades. Background Technology

[0002] Wind turbine blades are typically designed for a lifespan of 25 to 30 years. Decommissioned wind turbine blades contain a large amount of fiber-reinforced composite materials, such as glass fiber and carbon fiber reinforced epoxy resin composites. These materials have high structural strength but are difficult to degrade. Disposing of them through stockpiling or landfilling will occupy land and pollute soil and water for a long period. The resource utilization of decommissioned wind turbine blades is a crucial issue facing the development of renewable energy. Dismantling and crushing are key prerequisites and challenges for achieving resource utilization. Direct crushing is extremely energy-intensive and places stringent requirements on crushing equipment; currently, reliable and efficient crushing and recycling equipment and methods are still lacking.

[0003] Patent CN210207006U discloses a waste wind turbine blade crusher, including a base, a first support column, a crushing drum, a second support column, a collecting drum, a connecting rope, and a fixing hook. A self-locking wheel is provided on the lower end face of the base, and a first motor is mounted on the base. The first support column is mounted on the base, and a guide block and a crushing frame are provided on the left end face of the first support column. The crushing drum is disposed within a first through hole, the second motor is disposed within the crushing frame, the collecting drum is disposed on the second support column, the left end of the connecting rope is disposed on the collecting drum, a second through hole is formed on the second support column, and a fixing hook is disposed at the lower end of the connecting rope. This crusher mainly uses a crushing drum to crush the blades and uses a conveyor belt to transfer the fragments to prevent accumulation and blockage, but it lacks the capacity for pre-treatment and large-scale processing of blade materials.

[0004] Patent CN219377406U discloses a wind turbine blade crushing and sorting line, including a conveyor, shredder, crusher, gravity separator, heavy material vibrating screen, and light material vibrating screen. The top inlet of the shredder is connected to a first conveyor for conveying materials. The top inlet of the crusher is connected to the bottom outlet of the shredder via a second conveyor. The top inlet of the gravity separator is connected to the bottom outlet of the crusher via a third conveyor. The heavy material vibrating screen is correspondingly arranged with the heavy material outlet of the gravity separator, and it contains a screen for separating materials. The light material vibrating screen is correspondingly arranged with the light material outlet of the gravity separator, and it also contains a screen for separating materials. This crushing and sorting line has high capacity and high stability, but it still lacks pretreatment of the blade material, resulting in extremely high energy consumption during the crushing process and high requirements for the strength and investment cost of the crushing equipment.

[0005] Patent CN105881775A discloses a method for recycling wind turbine blades, including cutting the blades into blade blocks with a maximum size not exceeding 2m using a wire saw; crushing the blade blocks into particles with a maximum size not exceeding 5cm; and separating the particles according to material type to separate resin particles, fiberglass particles, and lightweight material particles, wherein the density of the lightweight material particles is lower than that of the resin particles and fiberglass particles; further pulverizing the resin particles into powder of 40-1250 mesh. This method uses cutting, double tearing, sorting, and pulverizing processes to break and classify the blades for recycling, improving the efficiency of wind turbine blade recycling, reducing operational difficulty, and ensuring high safety. However, it does not address the challenge of breaking high-strength fiber-reinforced composite materials after cutting the blades. The method does not provide a solution to the difficulty of breaking blade materials. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a system and method for the crushing and recycling of decommissioned wind turbine blades. By heat-treating the high-strength decommissioned wind turbine blades, the strength of the blade material is significantly reduced, greatly decreasing the energy consumption of blade crushing and enabling the recycling of decommissioned wind turbine blades. This invention is achieved through the following technical solutions:

[0007] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device, a heat treatment kiln, a coarse crusher, a fine crusher, a sorting device, a pulverizer, a screening device, and a conveying system.

[0008] The cutting and dismantling device includes a robotic cutting arm, a robotic dismantling arm, and a scanning detector. The cutting arm employs one of diamond saw cutting, water jet cutting, or laser cutting. The robotic dismantling arm is responsible for removing exposed metal parts during the cutting process and transferring the cut blade blocks. The scanning detector uses one of X-ray detection or CCD camera detection to guide the robotic cutting and dismantling arms, ensuring the cut blade blocks are the correct size. Blade cutting and metal part removal should be performed simultaneously; exposed metal parts are removed concurrently by the robotic dismantling arm. The scanning detector guides the robotic cutting arm, allowing for real-time setting of cutting parameters and positions to obtain blade blocks of the target size.

[0009] The heat treatment kiln is one of a mesh belt kiln and a roller kiln. It heats the cut blade blocks. The cut blade blocks should conform to the inlet size of the heat treatment kiln. The high strength of the blade material comes from the fiber-reinforced resin matrix material. The thermosetting matrix resin cannot be remelted, but its strength can be significantly reduced by heating.

[0010] The coarse crusher is located at the outlet of the heat treatment kiln and is a twin-shaft shear crusher; the fine crusher is located on the discharge side of the coarse crusher and is a twin-shaft shear crusher.

[0011] The sorting device is located at the discharge port of the fine crusher and employs either hydraulic flotation or air separation. The pulverizer is located at the discharge port of the sorting device and pulverizes the different sorted materials separately, employing either a hammer mill or a blade mill. The screening device is located at the discharge port of the pulverizer and employs vibrating screening. The transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, and the load transfers the decommissioned wind turbine blade materials from one process to the next.

[0012] Based on the above-described decommissioned wind turbine blade crushing and recycling system, this invention also proposes a decommissioned wind turbine blade crushing and recycling method, including the steps of dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization.

[0013] The removal of metal components refers to the removal of metal wires, devices, and connectors from the decommissioned wind turbine blades. The cutting is carried out on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks measuring 2.0–4.0m in length, 0.5–2.0m in width, and 0.05–0.3m in height, using one of the following methods: diamond saw cutting, water jet cutting, or laser cutting. Blade cutting and metal component removal should be carried out simultaneously; any exposed metal components during the cutting process can be removed concurrently. The cutting and removal process utilizes a scanning detector to acquire real-time information such as the blade's position, controlling the cutting to obtain blade blocks of the target size.

[0014] The heat treatment involves heating the cut blade blocks to 120–240°C in a mesh belt kiln or roller kiln, thereby reducing their strength. This is the key technical point of this invention. Wind turbine blades generally use thermosetting matrix resins as the matrix. Once cured, thermosetting resins cannot be reheated and melted. However, as the temperature rises, the cross-linked network structure in the matrix resin is destroyed, causing a sharp decrease in the strength of the fiber-reinforced composite material. Generally, epoxy resin-based materials begin to show a decrease in strength above 60°C, and other types of resin materials also show a significant decrease in strength above 100°C. Therefore, heating to 120–240°C will greatly reduce the strength of the fiber-reinforced composite material, making it easier to break and significantly reducing energy consumption. Since breaking is a key challenge in the recycling of decommissioned wind turbine blades, this invention proposes to first heat-treat the blades to reduce their strength, and then break them. The breaking process can be achieved using a conventional crusher, while blades that have not undergone heat treatment require a high-performance crusher. Currently, there is still no crusher capable of efficient and long-term stable operation to break up wind turbine blades.

[0015] The coarse crushing involves using a twin-shaft shear crusher to break the blade blocks to a length of 10–50 cm, a width of 2–10 cm, and a thickness of 0.5–1.0 cm. The fine crushing involves using a twin-shaft shear crusher to break the blades to a maximum size of 1.0–3.0 cm. Both coarse and fine crushing are completed within 20 minutes after heat treatment. Although the two crushing processes extend the process compared to single crushing, the dimensional changes in each crushing process are smaller, thus reducing overall energy consumption. Controlling the completion of both crushing processes within a certain time avoids recooling the heated material, ensuring the crushing process occurs when the material is at a low strength level, thereby reducing energy consumption.

[0016] The sorting process separates the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). The sieving process optionally involves sieving the fiber-reinforced composite material powder A using a 1.0mm screen to obtain oversize and undersize materials. The pulverization of the fiber-reinforced composite material and core material after sorting is necessary because the fiber-reinforced composite material has higher strength, while the core material has lower strength. Joint crushing would result in over-crushing of the lower-strength core material, while the higher-strength fiber-reinforced composite material would not reach the target size, increasing the energy consumption of the pulverization process.

[0017] The resource utilization involves using fiber-reinforced composite material powder A and core material powder B to partially replace the raw materials and fuels of cement kilns, with a replacement ratio ≤10wt.%. Powder A can replace the raw materials and fuels of cement kilns on its own, with the matrix resin serving as fuel and the glass fiber serving as an additive for SiO2. The oversize material from the sieve of the fiber-reinforced composite material is used as a reinforcing agent for building materials. The oversize material mainly consists of high-strength glass fiber and / or carbon fiber, which can be used as a reinforcing material for cement mortar, concrete, etc. The undersize material from the sieve of the fiber-reinforced composite material and core material powder B are used to partially replace pulverized coal, with a replacement ratio ≤3wt.%. The undersize material removes most of the reinforcing fibers, which can reduce the ash content of the fuel, thus not affecting the quality of the pulverized coal.

[0018] The beneficial technical effects of the present invention are as follows:

[0019] (1) The system provided by the present invention can continuously process retired wind turbine blades, including cutting, heat treatment, crushing and screening, to achieve efficient crushing and recycling of retired blades.

[0020] (2) The method provided by the present invention significantly reduces the strength of the blade material by preheating the retired wind turbine blades, thereby greatly reducing the difficulty and energy consumption of crushing, solving the key problem of blade recycling and crushing, and the energy consumption reduced by crushing is significantly lower than the energy consumption increased by heat treatment.

[0021] (3) The method provided by the present invention uses the materials recovered from the crushing of retired wind turbine blades to replace raw materials and fuels in cement kilns, building material reinforcing agents and pulverized coal, etc., thus realizing high consumption and high-value utilization of retired blades. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a decommissioned wind turbine blade crushing and recycling system according to the present invention;

[0023] Figure 2 This is a flowchart of a method for crushing and recycling decommissioned wind turbine blades according to the present invention.

[0024] 1-Cutting and dismantling device; 2-Heat treatment kiln; 3-Coarse crusher; 4-Fine crusher; 5-Sorting device; 6-Pulverizer; 7-Screening device. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Rather, this invention covers any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of the invention as defined in the claims.

[0026] Implementation Case 1

[0027] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses diamond saw blades for cutting; the dismantling arm removes exposed metal parts from the cutting process and transfers the cut blade fragments; the scanning detector uses X-ray detection to guide the cutting and dismantling arms. A mesh belt kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the outlet of the heat treatment kiln, and a fine crusher is located at the discharge port of the coarse crusher, both using a twin-shaft shear crusher. A sorting device is located at the discharge port of the fine crusher, using hydraulic flotation; a pulverizer is located at the discharge port of the sorting device, pulverizing the sorted materials separately using a hammer mill; a screening device is located at the discharge port of the pulverizer, using vibrating screening; a transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0028] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average length of 2.0m, width of 0.5m, and height of 0.05m using diamond saw blades. Heat treatment involves heating the cut blade blocks to 120℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 10cm, width of 2cm, and thickness of 0.5cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 1.0cm. Coarse and fine crushing are completed within 20 minutes after heat treatment.

[0029] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤10wt.%; the oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials; and the undersize material from the fiber-reinforced composite material sieve, along with core material powder B, is used to partially replace pulverized coal, with a replacement ratio ≤3wt.%.

[0030] Implementation Case 2

[0031] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses water jet cutting; the dismantling arm removes exposed metal parts and transfers the cut blade fragments; the scanning detector uses a CCD camera to guide the cutting and dismantling arms. A roller kiln heats the cut blade fragments. A coarse crusher is located at the kiln outlet, and a fine crusher is located at the coarse crusher outlet, both using a twin-shaft shear crusher. A sorting device is located at the fine crusher outlet, using air separation; a pulverizer is located at the sorting device outlet, pulverizing the sorted materials separately using a blade pulverizer; a screening device is located at the pulverizer outlet, using vibrating screening; a transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0032] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average size of 2.5m long, 0.5m wide, and 0.1m high using water jet cutting. Heat treatment involves heating the cut blade blocks to 140℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 15cm, width of 4cm, and thickness of 0.7cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 1.0cm. Coarse and fine crushing are completed within 20 minutes after heat treatment.

[0033] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤10wt.%; the oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials; and the undersize material from the fiber-reinforced composite material sieve, along with core material powder B, is used to partially replace pulverized coal, with a replacement ratio ≤3wt.%.

[0034] Implementation Case 3

[0035] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses laser cutting; the dismantling arm removes exposed metal parts and transfers the cut blade fragments; the scanning detector uses X-ray detection to guide the cutting and dismantling arms. A mesh belt kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the kiln outlet, and a fine crusher is located at the coarse crusher outlet, both using a twin-shaft shear crusher. A sorting device is located at the fine crusher outlet, using hydraulic flotation; a pulverizer is located at the sorting device outlet, pulverizing the sorted materials separately using a hammer mill; a screening device is located at the pulverizer outlet, using vibrating screening; and a transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0036] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average size of 3.0m long, 1.0m wide, and 0.15m high using laser cutting. Heat treatment involves heating the cut blade blocks to 160℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 25cm, width of 5cm, and thickness of 0.8cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 2.0cm. Coarse and fine crushing are completed within 20 minutes after heat treatment.

[0037] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤10wt.%; the oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials; and the undersize material from the fiber-reinforced composite material sieve, along with core material powder B, is used to partially replace pulverized coal, with a replacement ratio ≤3wt.%.

[0038] Implementation Case 4

[0039] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses diamond saw blades for cutting; the dismantling arm removes exposed metal parts and transfers the cut blade fragments; the scanning detector uses a CCD camera to guide the cutting and dismantling arms. A roller kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the kiln outlet, and a fine crusher is located at the coarse crusher outlet, both using a twin-shaft shear crusher. A sorting device is located at the fine crusher outlet, using air separation; a pulverizer is located at the sorting device outlet, pulverizing the sorted materials separately using a blade pulverizer; a screening device is located at the pulverizer outlet, using vibrating screening; and a transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0040] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average length of 3.5m, width of 1.0m, and height of 0.2m using diamond saw blades. Heat treatment involves heating the cut blade blocks to 180℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 30cm, width of 7cm, and thickness of 0.9cm; fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 2.0cm. Coarse and fine crushing are completed within 15 minutes after heat treatment.

[0041] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤10wt.%; the oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials; and the undersize material from the fiber-reinforced composite material sieve, along with core material powder B, is used to partially replace pulverized coal, with a replacement ratio ≤3wt.%.

[0042] Implementation Case 5

[0043] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses water jet cutting; the dismantling arm removes exposed metal parts and transfers the cut blade fragments; the scanning detector uses X-ray detection to guide the cutting and dismantling arms. A mesh belt kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the kiln outlet, and a fine crusher is located at the coarse crusher outlet, both using a twin-shaft shear crusher. A sorting device is located at the fine crusher outlet, using air separation; a pulverizer is located at the sorting device outlet, pulverizing the sorted materials separately using a blade pulverizer; a screening device is located at the pulverizer outlet, using vibrating screening; a transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0044] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average size of 4.0m long, 2.0m wide, and 0.3m high using water jet cutting. Heat treatment involves heating the cut blade blocks to 200℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties due to increased temperature. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 50cm, width of 10cm, and thickness of 1.0cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 3.0cm. Coarse and fine crushing are completed within 15 minutes after heat treatment.

[0045] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤8wt.%. The oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials. The undersize material from the fiber-reinforced composite material sieve and core material powder B are used to partially replace pulverized coal, with a replacement ratio ≤2wt.%.

[0046] Implementation Case 6

[0047] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses laser cutting; the dismantling arm removes exposed metal parts and transfers the cut blade fragments; the scanning detector uses a CCD camera to guide the cutting and dismantling arms. A roller kiln heats the cut blade fragments. A coarse crusher is located at the kiln outlet, and a fine crusher is located at the coarse crusher outlet, both using a twin-shaft shear crusher. A sorting device is located at the fine crusher outlet, using hydraulic flotation; a pulverizer is located at the sorting device outlet, pulverizing the sorted materials separately using a hammer mill; a screening device is located at the pulverizer outlet, using vibrating screening. A transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0048] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average size of 2.0m long, 1.0m wide, and 0.25m high using laser cutting. Heat treatment involves heating the cut blade blocks to 220℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties due to increased temperature. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 25cm, width of 3cm, and thickness of 0.5cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 1.0cm. Coarse and fine crushing are completed within 15 minutes after heat treatment.

[0049] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤10wt.%; the oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials; and the undersize material from the fiber-reinforced composite material sieve, along with core material powder B, is used to partially replace pulverized coal, with a replacement ratio ≤3wt.%.

[0050] Implementation Case 7

[0051] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses diamond saw blades for cutting; the dismantling arm removes exposed metal parts and transfers the cut blade fragments; the scanning detector uses X-ray detection to guide the cutting and dismantling arms. A mesh belt kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the kiln outlet, and a fine crusher is located at the coarse crusher outlet, both using a twin-shaft shear crusher. A sorting device is located at the fine crusher outlet, using air separation; a pulverizer is located at the sorting device outlet, pulverizing the sorted materials separately using a blade pulverizer; a screening device is located at the pulverizer outlet, using vibrating screening; a transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0052] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average length of 2.5m, width of 1.5m, and height of 0.1m using diamond saw blades. Heat treatment involves heating the cut blade blocks to 240℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 30cm, width of 5cm, and thickness of 0.5cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 2.0cm. Coarse and fine crushing are completed within 15 minutes after heat treatment.

[0053] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤10wt.%; the oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials; and the undersize material from the fiber-reinforced composite material sieve, along with core material powder B, is used to partially replace pulverized coal, with a replacement ratio ≤3wt.%.

[0054] Implementation Case 8

[0055] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a robotic cutting arm, a robotic dismantling arm, and a scanning detector. The cutting arm employs water jet cutting. The robotic dismantling arm is responsible for removing exposed metal parts during the cutting process and transferring the cut blade fragments. The scanning detector uses a CCD camera to guide the operation of the robotic cutting and dismantling arms. A roller kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the outlet of the heat treatment kiln, and a fine crusher is located at the discharge port of the coarse crusher; both are dual-shaft shear crushers. A sorting device is located at the discharge port of the fine crusher, employing hydraulic flotation. A pulverizer is located at the discharge port of the sorting device, pulverizing the sorted materials separately using a hammer mill. A screening device is located at the discharge port of the pulverizer, employing vibrating screening. A transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0056] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average size of 3.0m long, 0.5m wide, and 0.05m high using water jet cutting. Heat treatment involves heating the cut blade blocks to 200℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties due to increased temperature. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 20cm, width of 2cm, and thickness of 0.5cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 1.5cm. Coarse and fine crushing are completed within 15 minutes after heat treatment.

[0057] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤10wt.%; the oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials; and the undersize material from the fiber-reinforced composite material sieve, along with core material powder B, is used to partially replace pulverized coal, with a replacement ratio ≤3wt.%.

[0058] Implementation Case 9

[0059] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses laser cutting; the dismantling arm removes exposed metal parts and transfers the cut blade fragments; the scanning detector uses X-ray detection to guide the cutting and dismantling arms. A mesh belt kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the kiln outlet, and a fine crusher is located at the coarse crusher outlet, both using a twin-shaft shear crusher. A sorting device is located at the fine crusher outlet, using hydraulic flotation; a pulverizer is located at the sorting device outlet, pulverizing the sorted materials separately using a hammer mill; a screening device is located at the pulverizer outlet, using vibrating screening; and a transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0060] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average size of 3.5m long, 2.0m wide, and 0.2m high using laser cutting. Heat treatment involves heating the cut blade blocks to 180℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 40cm, width of 8cm, and thickness of 0.8cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 2.5cm. Coarse and fine crushing are completed within 15 minutes after heat treatment.

[0061] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤10wt.%; the oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials; and the undersize material from the fiber-reinforced composite material sieve, along with core material powder B, is used to partially replace pulverized coal, with a replacement ratio ≤3wt.%.

[0062] Implementation Case 10

[0063] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses diamond saw blades for cutting; the dismantling arm removes exposed metal parts and transfers the cut blade fragments; the scanning detector uses a CCD camera to guide the cutting and dismantling arms. A roller kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the kiln outlet, and a fine crusher is located at the coarse crusher outlet, both using a twin-shaft shear crusher. A sorting device is located at the fine crusher outlet, using air separation; a pulverizer is located at the sorting device outlet, pulverizing the sorted materials separately using a blade pulverizer; a screening device is located at the pulverizer outlet, using vibrating screening; and a transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0064] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average size of 4.0m long, 2.0m wide, and 0.3m high using diamond saw blades. Heat treatment involves heating the cut blade blocks to 200℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 50cm, width of 9cm, and thickness of 0.9cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 3.0cm. Coarse and fine crushing are completed within 20 minutes after heat treatment.

[0065] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤8wt.%. The oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials. The undersize material from the fiber-reinforced composite material sieve and core material powder B are used to partially replace pulverized coal, with a replacement ratio ≤2wt.%.

[0066] Implementation Case 11

[0067] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm employs water jet cutting. The dismantling arm is responsible for removing exposed metal parts and transferring the cut blade fragments. The scanning detector uses X-ray detection to guide the operation of the cutting and dismantling arms. A mesh belt kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the outlet of the heat treatment kiln, and a fine crusher is located at the discharge port of the coarse crusher, both employing a twin-shaft shear crusher. A sorting device is located at the discharge port of the fine crusher, employing hydraulic flotation. A pulverizer is located at the discharge port of the sorting device, pulverizing the sorted materials separately using a hammer mill. A screening device is located at the discharge port of the pulverizer, employing vibrating screening. A transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0068] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average size of 4.0m long, 1.0m wide, and 0.1m high using water jet cutting. Heat treatment involves heating the cut blade blocks to 220℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties due to increased temperature. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 45cm, width of 9cm, and thickness of 1.0cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 3.0cm. Coarse and fine crushing are completed within 20 minutes after heat treatment.

[0069] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤9wt.%. The oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials. The undersize material from the fiber-reinforced composite material sieve and core material powder B are used to partially replace pulverized coal, with a replacement ratio ≤2wt.%.

[0070] Implementation Case 12

[0071] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses laser cutting; the dismantling arm removes exposed metal parts and transfers the cut blade fragments; the scanning detector uses a CCD camera to guide the cutting and dismantling arms. A roller kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the kiln outlet, and a fine crusher is located at the coarse crusher outlet, both using a twin-shaft shear crusher. A sorting device is located at the fine crusher outlet, using air separation; a pulverizer is located at the sorting device outlet, pulverizing the sorted materials separately using a blade pulverizer; a screening device is located at the pulverizer outlet, using vibrating screening; a transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0072] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average size of 3.0m long, 1.0m wide, and 0.2m high using laser cutting. Heat treatment involves heating the cut blade blocks to 230℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 35cm, width of 7cm, and thickness of 1.0cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 2.5cm. Coarse and fine crushing are completed within 20 minutes after heat treatment.

[0073] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤9wt.%. The oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials. The undersize material from the fiber-reinforced composite material sieve and core material powder B are used to partially replace pulverized coal, with a replacement ratio ≤2wt.%.

[0074] Implementation Case 13

[0075] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses diamond saw blades for cutting; the dismantling arm removes exposed metal parts and transfers the cut blade fragments; the scanning detector uses X-ray detection to guide the cutting and dismantling arms. A mesh belt kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the kiln outlet, and a fine crusher is located at the coarse crusher outlet, both using a twin-shaft shear crusher. A sorting device is located at the fine crusher outlet, using air separation; a pulverizer is located at the sorting device outlet, pulverizing the sorted materials separately using a blade pulverizer; a screening device is located at the pulverizer outlet, using vibrating screening; a transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0076] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average size of 2.0m long, 0.5m wide, and 0.05m high using diamond saw blades. Heat treatment involves heating the cut blade blocks to 150℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 10cm, width of 3cm, and thickness of 0.6cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 1.0cm. Coarse and fine crushing are completed within 20 minutes after heat treatment.

[0077] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤10wt.%; the oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials; and the undersize material from the fiber-reinforced composite material sieve, along with core material powder B, is used to partially replace pulverized coal, with a replacement ratio ≤3wt.%.

[0078] Implementation Case 14

[0079] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a robotic cutting arm, a robotic dismantling arm, and a scanning detector. The cutting arm employs water jet cutting. The robotic dismantling arm is responsible for removing exposed metal parts during the cutting process and transferring the cut blade fragments. The scanning detector uses a CCD camera to guide the operation of the robotic cutting and dismantling arms. A roller kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the outlet of the heat treatment kiln, and a fine crusher is located at the discharge port of the coarse crusher; both are dual-shaft shear crushers. A sorting device is located at the discharge port of the fine crusher, employing hydraulic flotation. A pulverizer is located at the discharge port of the sorting device, pulverizing the sorted materials separately using a hammer mill. A screening device is located at the discharge port of the pulverizer, employing vibrating screening. A transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0080] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average size of 2.0m long, 0.5m wide, and 0.1m high using water jet cutting. Heat treatment involves heating the cut blade blocks to 170℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 15cm, width of 4cm, and thickness of 0.6cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 1.0cm. Coarse and fine crushing are completed within 20 minutes after heat treatment.

[0081] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤10wt.%; the oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials; and the undersize material from the fiber-reinforced composite material sieve, along with core material powder B, is used to partially replace pulverized coal, with a replacement ratio ≤3wt.%.

[0082] Implementation Case 15

[0083] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses laser cutting; the dismantling arm removes exposed metal parts and transfers the cut blade fragments; the scanning detector uses X-ray detection to guide the cutting and dismantling arms. A mesh belt kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the kiln outlet, and a fine crusher is located at the coarse crusher outlet, both using a twin-shaft shear crusher. A sorting device is located at the fine crusher outlet, using air separation; a pulverizer is located at the sorting device outlet, pulverizing the sorted materials separately using a blade pulverizer; a screening device is located at the pulverizer outlet, using vibrating screening; a transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0084] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average size of 3.0m long, 1.0m wide, and 0.3m high using laser cutting. Heat treatment involves heating the cut blade blocks to 190℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 35cm, width of 8cm, and thickness of 0.7cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 2.0cm. Coarse and fine crushing are completed within 20 minutes after heat treatment.

[0085] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤10wt.%; the oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials; and the undersize material from the fiber-reinforced composite material sieve, along with core material powder B, is used to partially replace pulverized coal, with a replacement ratio ≤3wt.%.

[0086] Implementation Case 16

[0087] A decommissioned wind turbine blade crushing and recycling system includes a cutting and dismantling device comprising a cutting arm, a dismantling arm, and a scanning detector. The cutting arm uses diamond saw blades for cutting; the dismantling arm removes exposed metal parts from the cutting process and transfers the cut blade fragments; the scanning detector uses a CCD camera to guide the cutting and dismantling arms. A roller kiln is used for heat treatment of the cut blade fragments. A coarse crusher is located at the outlet of the heat treatment kiln, and a fine crusher is located at the discharge port of the coarse crusher, both using a twin-shaft shear crusher. A sorting device is located at the discharge port of the fine crusher, using hydraulic flotation; a pulverizer is located at the discharge port of the sorting device, pulverizing the sorted materials separately using a hammer mill; a screening device is located at the discharge port of the pulverizer, using vibrating screening; a transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, transferring decommissioned wind turbine blade materials from one process to the next.

[0088] A method for crushing and recycling decommissioned wind turbine blades based on the above system includes the following steps: dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization. Dismantling metal parts involves removing metal wires, components, and connectors from the decommissioned wind turbine blades. Cutting is performed on-site at the wind farm, cutting the decommissioned wind turbine blades into blade blocks with an average length of 2.0m, width of 2.0m, and height of 0.2m using diamond saw blades. Heat treatment involves heating the cut blade blocks to 210℃ in a mesh belt kiln or roller kiln, reducing their mechanical properties. Coarse crushing uses a twin-shaft shear crusher to crush the blade blocks to an average length of 20cm, width of 5cm, and thickness of 0.6cm. Fine crushing uses a twin-shaft shear crusher to crush the blades into fragments with a maximum size of 1.0cm. Coarse and fine crushing are completed within 20 minutes after heat treatment.

[0089] The separation process involves separating the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves crushing the denser fiber-reinforced composite material into powder A (≤1.5mm) and the less dense core material into powder B (≤1.0mm). Optionally, the fiber-reinforced composite material powder A is sieved through a 1.0mm screen to obtain oversize and undersize materials. Resource utilization includes the optional use of fiber-reinforced composite material powder A and core material powder B to partially replace raw materials and fuels in cement kilns, with a replacement ratio ≤10wt.%; the oversize material from the fiber-reinforced composite material sieve is used as a reinforcing agent in building materials; and the undersize material from the fiber-reinforced composite material sieve, along with core material powder B, is used to partially replace pulverized coal, with a replacement ratio ≤3wt.%.

Claims

1. A method for crushing and recycling decommissioned wind turbine blades, characterized in that, It includes cutting and dismantling equipment, heat treatment kiln, coarse crusher, fine crusher, sorting equipment, pulverizer, screening equipment, and conveying system; the method includes dismantling metal parts, cutting, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, screening, and resource utilization steps; The heat treatment kiln is one of a mesh belt kiln and a roller kiln, used to heat the cut blade blocks. The heat treatment involves heating the cut blade blocks to 120–240°C in a mesh belt kiln or roller kiln, causing the blade blocks to heat up and reduce their mechanical properties. The coarse crusher is located at the outlet of the heat treatment kiln and is a twin-shaft shear crusher. The fine crusher is located on the discharge side of the coarse crusher and is also a twin-shaft shear crusher. The coarse crushing breaks the blade blocks into pieces with a length of 10-50cm, a width of 2-10cm, and a thickness of 0.5-1.0cm; the fine crushing breaks the blades into fragments with a maximum size of 1.0-3.0cm; the coarse and fine crushing are completed within 20 minutes after heat treatment. The sorting process separates the denser fiber-reinforced composite material from the less dense core material in the crushed material using flotation or air classification. The pulverization process involves pulverizing the denser fiber-reinforced composite material into powder A with a size ≤ 1.5 mm, and pulverizing the less dense core material into powder B with a size ≤ 1.0 mm. The sieving process involves sieving the fiber-reinforced composite material powder A using a 1.0 mm sieve to obtain oversize and undersize materials. The resource utilization involves using fiber-reinforced composite material powder A and sandwich material powder B to partially replace the raw materials and fuels of cement kilns, with a replacement ratio of ≤10wt.%. The oversize material from the screening of fiber-reinforced composite materials is used as a reinforcing agent in building materials; The undersize material from the fiber-reinforced composite material screening and the sandwich material powder B are used to partially replace coal powder, with a replacement ratio of ≤3wt.%.

2. The method for crushing and recycling decommissioned wind turbine blades according to claim 1, characterized in that, The cutting and dismantling device includes a machine cutting arm, a machine dismantling arm, and a scanning detector. The machine cutting arm uses one of diamond saw cutting, water jet cutting, and laser cutting. The machine dismantling arm is responsible for dismantling the metal parts exposed during the cutting process and transferring the cut blade blocks. The scanning detector uses one of X-ray detection and CCD camera detection to guide the machine cutting arm and machine dismantling arm to ensure the size of the cut blade blocks.

3. The method for crushing and recycling decommissioned wind turbine blades according to claim 1, characterized in that, The sorting device is located at the discharge port of the fine crusher and employs either hydraulic flotation or air separation. The pulverizer is located at the discharge port of the sorting device and pulverizes the different sorted materials separately, employing either a hammer mill or a blade mill. The screening device is located at the discharge port of the pulverizer and employs vibrating screening. The transmission system runs through the entire process of blade cutting and dismantling, heat treatment, coarse crushing, fine crushing, sorting, pulverizing, and screening, and the load transfers the decommissioned wind turbine blade materials from one process to the next.

4. The method for crushing and recycling decommissioned wind turbine blades according to claim 1, characterized in that, The metal parts to be removed are the metal wires, devices and connectors removed from the decommissioned wind turbine blades; the cutting is to cut the decommissioned wind turbine blades on-site at the wind farm, cutting the blades into blade blocks with a length of 2.0 to 4.0m, a width of 0.5 to 2.0m and a height of 0.05 to 0.3m, using one of diamond saw cutting, water jet cutting and laser cutting.

Images