A method and device for grading and reforming recycling of decommissioned wind turbine blades

Abstract

The application provides a method and device for grading gasification and reforming recovery of retired fan blades, and belongs to the technical field of solid waste decomposition and recovery. The method comprises the following steps: heating retired fan blade particles to 700-900 DEG C in an inert atmosphere, introducing water vapor for pyrolysis to obtain pyrolysis gas; introducing the pyrolysis gas into a porous medium loaded with an active metal catalyst to perform periodic pulse joule heating, and the average temperature in the process is 900-1200 DEG C to obtain hydrogen-rich synthesis gas; and cooling and recovering glass fibers in an inert atmosphere after pyrolysis. Heating in an inert atmosphere can prevent oxidation reaction and protect the structure of glass fibers; the introduction of water vapor can realize complete decomposition of the resin matrix, and the glass fibers obtained have high surface cleanliness and high tensile strength retention rate; then, the joule effect is used to realize rapid multi-stage high temperature, and the first-stage pyrolysis product is directionally converted into hydrogen-rich synthesis gas. The problems of high recovery cost and large environmental risk of the existing retired fan blades are solved.

Description

A method and apparatus for staged gasification and reforming recovery of decommissioned wind turbine blades. Technical Field

[0001] This invention belongs to the field of solid waste decomposition and recycling technology, and particularly relates to a method and system for graded gasification and reforming recycling of retired wind turbine blades. Specifically, it relates to a method and apparatus for graded gasification and reforming recycling of retired wind turbine blades to recover glass fiber and prepare hydrogen-rich syngas. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] With the rapid growth of global wind power installed capacity, the disposal of solid waste generated from retired wind turbine blades has become increasingly prominent. Wind turbine blades are made of composite materials, including glass fiber and resin. Because composite materials are difficult to degrade, traditional landfilling is not the preferred method for disposing of retired wind turbine blades. Pyrolysis, currently the most promising recycling technology for treating retired wind turbine blades, still faces many technical bottlenecks in practical applications, such as insufficient fiber purity, poor control over gasification products, and low energy efficiency of the catalytic system.

[0004] In existing technologies for directly pyrolyzing decommissioned wind turbine blade powder, adjusting the pyrolysis temperature can control the composition of the crude syngas, but the quality of the recovered glass fiber is not taken into account, resulting in a large amount of deposits (especially residual carbon) on its surface and a low gas yield.

[0005] The technology of using pyrolysis promoters (such as acetic acid and hydrogen peroxide) to pyrolyze decommissioned wind turbine blades can reduce the carbon content (<1%) of recycled glass fibers while maintaining high tensile strength. However, this method relies on chemical reagents to clean the fibers and suppress the formation of pyrolysis carbon, and lacks the ability to modulate gaseous byproducts, increasing costs and post-processing burdens.

[0006] The method of vacuum pyrolysis for segmented treatment of retired wind turbine blades can recover pyrolysis gas, pyrolysis oil, and metal and fiber materials, achieving efficient resource utilization and low pollution emissions; however, the syngas control capability is weak, the added value of the products is low, and the system is complex and energy consumption is high. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a method and apparatus for the staged gasification and reforming recovery of decommissioned wind turbine blades, which can convert decommissioned wind turbine blades into high-value-added hydrogen-rich syngas and glass fibers, and the glass fibers have the characteristics of high surface cleanliness and high tensile strength retention.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows:

[0009] In a first aspect, a method for the staged gasification and reforming recovery of decommissioned wind turbine blades includes the following steps:

[0010] S1. Heat the decommissioned wind turbine blade particles to 700~900℃ in an inert atmosphere, and then pass in steam for pyrolysis to obtain pyrolysis gas.

[0011] S2. The pyrolysis gas is introduced into a porous medium supported with an active metal catalyst and subjected to periodic pulse Joule heating. The average temperature during the process is 900~1200℃ to obtain hydrogen-rich synthesis gas.

[0012] S3. After pyrolysis, the glass fibers are cooled and recovered in an inert atmosphere.

[0013] Secondly, a staged gasification and reforming recovery device for retired wind turbine blades includes a feeding device, a fixed-bed pyrolysis reaction device, and a periodic pulse Joule heating device that are interconnected. The fixed-bed pyrolysis reaction device is connected to an inert gas source and a gasifying agent gas source, respectively. The periodic pulse Joule heating device is provided with a porous medium loaded with an active metal catalyst.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. This invention constructs a gradient pyrolysis system: First, heating in an inert atmosphere effectively prevents oxidation and protects the glass fiber structure; then, a gasifying agent is introduced into the first-stage high-temperature pyrolysis zone, and precise temperature field control achieves complete decomposition of the resin matrix, reducing residual carbon and obtaining glass fibers with a surface cleanliness >98% and high tensile strength retention; the second-stage Joule thermal reforming zone is equipped with a porous media reaction bed, achieving rapid multi-stage high temperature through the Joule effect, directionally converting the first-stage pyrolysis products into hydrogen-rich syngas. This solves the problems of high recycling costs and significant environmental risks associated with existing decommissioned wind turbine blades.

[0016] 2. This invention establishes a product regulation mechanism: In the pretreatment of raw materials, the decommissioned wind turbine blades are first crushed into particles to increase the specific surface area and improve the pyrolysis efficiency; then, drying is carried out to reduce the moisture content and avoid moisture interfering with the pyrolysis reaction; in the catalytic reforming process of the pyrolysis gas, by adjusting the Joule heat power and the gasifying agent flow rate, a gasifying agent flow rate-Joule heat power coordinated regulation model is established to achieve precise regulation of the H2 / CO ratio in the range of 1.5 to 3.0. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Figure 1 is a schematic flowchart of the graded gasification and reforming recovery method for decommissioned wind turbine blades in Embodiment 2 of the present invention.

[0019] Figure 2 is a schematic diagram of the structure of the graded gasification and reforming recovery device for retired wind turbine blades in Embodiment 1 of the present invention; wherein, 1, feeding device; 2, fixed bed pyrolysis reaction device; 3, periodic pulse Joule heating device; 4, inert gas source; 5, gasifying agent gas source; 6, cooling and filtration device.

[0020] Figure 3 shows the microstructure of the glass fiber prepared in Comparative Example 1 of this invention.

[0021] Figure 4 shows the microstructure of the glass fiber prepared in Example 2 of this invention. Detailed Implementation

[0022] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. 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 invention pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] A typical embodiment of the present invention provides a method for staged gasification and reforming recovery of decommissioned wind turbine blades, comprising the following steps:

[0025] S1. Heat the decommissioned wind turbine blade particles to 700~900℃ in an inert atmosphere, and then pass in steam for pyrolysis to obtain pyrolysis gas.

[0026] S2. The pyrolysis gas is introduced into a porous medium supported with an active metal catalyst and subjected to periodic pulse Joule heating. The average temperature during the process is 900~1200℃ to obtain hydrogen-rich synthesis gas.

[0027] S3. After pyrolysis, the glass fibers are cooled and recovered in an inert atmosphere.

[0028] In the above process, an inert atmosphere is first used to prevent the oxidation reaction of the decommissioned wind turbine blade particles and protect the glass fiber structure. The resin matrix treatment process includes a primary pyrolysis process and a secondary Joule thermal reforming process. In the primary pyrolysis process, the resin matrix is ​​completely pyrolyzed by controlling the temperature with the participation of a gasifying agent, reducing residual carbon and obtaining glass fibers with high surface cleanliness and high tensile strength retention. In the secondary Joule thermal reforming process of the pyrolysis gas, the Joule effect is used to achieve rapid multi-stage high temperature and directionally convert the pyrolysis products into hydrogen-rich synthesis gas.

[0029] Optionally, the retired wind turbine blades are made of glass fiber reinforced composite material, which is the mainstream type of wind turbine blades.

[0030] Optionally, in S1, the preparation method of the decommissioned wind turbine blade particles includes: cutting and crushing the decommissioned wind turbine blades into particles with a diameter <10cm and then drying them until the moisture content is less than 0.5wt%; crushing the decommissioned wind turbine blades into particles can increase the specific surface area and improve the pyrolysis efficiency; when the particle size is >10cm, it may lead to uneven pyrolysis, affecting the resin decomposition efficiency and increasing the pyrolysis cost; drying treatment can avoid moisture interfering with the pyrolysis reaction.

[0031] Optionally, drying methods include drying at 100~110℃ for more than 4 hours. This method can reduce the moisture content to below the target value and avoid moisture interfering with the pyrolysis reaction.

[0032] Optionally, in S1, the inert atmosphere includes one or more of nitrogen, argon, and helium; the oxygen content of the pyrolysis atmosphere is <0.1% to protect the glass fiber structure.

[0033] Optionally, in S1, the pyrolysis process is carried out in a fixed-bed pyrolysis reactor; this can accelerate the heating rate, achieve rapid pyrolysis, and effectively avoid side reactions that occur during the heating process; the temperature is set to 700~900℃. When the pyrolysis temperature is too low, the resin decomposes incompletely, and the residue contaminates the fiber surface; when the pyrolysis temperature is too high, the glass fiber undergoes a glass transition, resulting in a sharp increase in strength loss.

[0034] Optionally, in S1, the water vapor is a gasifying agent; the purpose of water vapor as a gasifying agent includes: on the one hand, reacting with carbon to generate carbon monoxide and hydrogen (C + H2O → CO + H2), thus removing carbon; on the other hand, water vapor serves as a hydrogen source to provide an appropriate hydrogen-oxygen ratio, which, combined with subsequent periodic pulse Joule heating, reforms the volatiles to obtain hydrogen-rich syngas.

[0035] Optionally, in S1, the molar ratio of water vapor to inert gas in the pyrolysis stage is 1:(0.2~1.0), preferably 1:0.5, to ensure controllable pyrolysis reaction atmosphere and stable temperature, while avoiding excessive dilution of reactant concentration by inert gas, which would affect pyrolysis efficiency. The mass ratio (S / B ratio) of water vapor introduced throughout the pyrolysis stage to the particles of the decommissioned wind turbine blades is 1.0~1.5. Water vapor that does not participate in the reaction during the pyrolysis stage will enter the S2 step with the pyrolysis gas to continue reacting and transform into hydrogen-rich syngas. When the S / B ratio is below 1.0, insufficient water vapor will lead to increased carbon deposits and higher tar production; when the S / B ratio is above 1.5, excessive steam dilutes the syngas, lowering the reaction temperature and increasing heat loss.

[0036] Optionally, in S2, the porous medium includes one or more of graphite carbon felt, foamed silicon carbide, and foamed carbon; the active metal catalyst includes one or more of iron-based, nickel-based, and cobalt-based catalysts.

[0037] Optionally, in S2, the periodic pulsed Joule heating method includes: using periodic pulse heating, with a pulse time of 0.1~1s and a duty cycle (pulse time / cycle time) of 20%~50%; if the pulse time is too short, the reaction will not proceed completely, and if it is too long, it will lead to increased equipment wear, shortened life of porous media catalyst, and increased energy consumption; if the duty cycle is too small, the temperature will be too low, and the reaction will be difficult to proceed continuously; if the duty cycle is too high, it will easily lead to overheating of the porous media, and the metal catalyst will melt, agglomerate, and deactivate; Joule heating makes the average temperature reach 900~1200℃; if the temperature is too low, the carbon conversion rate is low, and unreacted carbon is deposited in the porous media, reducing the efficiency of the reaction zone; if the temperature is too high, the catalyst and equipment wear will be increased, the life of porous media catalyst will be shortened, the replacement frequency will increase, and the energy consumption economy will be poor.

[0038] Optionally, in S2, the hydrogen-rich syngas is recovered after cooling and filtration. The cooling and filtration methods include: using a heat exchanger to reduce the gas temperature to room temperature (20~40℃), and removing condensate, tar and fine particulate impurities through a quartz sand filter bed or ceramic filter element to ensure that the collected hydrogen-rich syngas is free of liquid or solid impurities, thereby improving gas purity and storage and transportation safety.

[0039] Optionally, in S3, the glass fibers are recycled after being cooled to room temperature in the same inert atmosphere as in S1.

[0040] A typical embodiment of the present invention provides a staged gasification and reforming recovery device for retired wind turbine blades, comprising a feeding device, a fixed-bed pyrolysis reaction device and a periodic pulse Joule heating device that are interconnected. The fixed-bed pyrolysis reaction device is connected to an inert gas source and a gasifying agent gas source, respectively. The periodic pulse Joule heating device is provided with a porous medium loaded with an active metal catalyst.

[0041] In the above apparatus, the feeding device is used to transport the decommissioned wind turbine blades, crushed to a set particle size and dried, to the fixed-bed pyrolysis reactor; the fixed-bed pyrolysis reactor is used to heat the decommissioned wind turbine blades to a set pyrolysis temperature under an inert atmosphere, and to perform pyrolysis after introducing a gasifying agent, producing pyrolysis gas and preserving residual glass fibers; the periodic pulse Joule heating device is used to subject the pyrolysis gas to periodic pulse Joule heating in a porous medium loaded with an active metal catalyst to obtain hydrogen-rich synthesis gas through directional conversion.

[0042] Optionally, the periodic pulse Joule heating device is connected to a cooling and filtering device for cooling and filtering the hydrogen-rich synthesis gas.

[0043] Optionally, the porous medium includes one or more of graphite carbon felt, foamed silicon carbide, and foamed carbon; the active metal catalyst includes one or more of iron-based, nickel-based, and cobalt-based catalysts, used for the catalytic conversion of pyrolysis gas into hydrogen-rich syngas.

[0044] Example 1

[0045] A staged gasification and reforming recovery device for retired wind turbine blades, as shown in Figure 2, includes a feeding device 1, a fixed-bed pyrolysis reaction device 2, and a periodic pulse Joule heating device 3 that are interconnected. The fixed-bed pyrolysis reaction device 2 is connected to an inert gas source 4 and a gasifying agent gas source 5, respectively. The downstream of the periodic pulse Joule heating device 3 is connected to a cooling and filtering device 6. The periodic pulse Joule heating device 3 is provided with a porous medium loaded with an active metal catalyst.

[0046] Feeding device 1 is used to transport decommissioned wind turbine blades crushed to a set particle size and dried to fixed bed pyrolysis reactor 2. Inert gas source 4 is used to supply inert gas to fixed bed pyrolysis reactor 2, and gasifying agent gas source 5 is used to supply gasifying agent to fixed bed pyrolysis reactor 2. Fixed bed pyrolysis reactor 2 is used to heat the decommissioned wind turbine blades to a set pyrolysis temperature under an inert atmosphere, and to carry out pyrolysis after the introduction of gasifying agent, preserving the residual glass fiber and transporting the generated pyrolysis gas and gasifying agent to periodic pulse Joule heating device 3. Periodic pulse Joule heating device 3 is used to subject the pyrolysis gas and gasifying agent to periodic pulse Joule heating in a porous medium loaded with an active metal catalyst to obtain directionally converted hydrogen-rich syngas, and to transport the hydrogen-rich syngas to cooling and filtering device 6. Cooling and filtering device 6 is used to cool and filter the hydrogen-rich syngas.

[0047] The porous media include one or more of graphite carbon felt, foamed silicon carbide, and foamed carbon; the active metal catalyst includes one or more of iron-based, nickel-based, and cobalt-based catalysts. The porous media and active metal catalysts can be replaced according to the specific process and are used for the catalytic conversion of pyrolysis gas into hydrogen-rich synthesis gas.

[0048] Example 2

[0049] A method for staged gasification and reforming recovery of decommissioned wind turbine blades, using the equipment provided in Example 1, as shown in Figure 1, includes the following steps:

[0050] S1. After the decommissioned wind turbine blade particles are divided and crushed into particles with a diameter of <10cm, they are dried at 105℃ for 5 hours until the moisture content is less than 0.5wt%. The processed decommissioned wind turbine blade particles are fed into a fixed bed pyrolysis reactor for primary pyrolysis: Argon (inert gas) is introduced into the fixed bed pyrolysis reactor to purge the air and reduce the oxygen content to below 0.1%. Then, water vapor (gasifying agent) is introduced to make the ratio of water vapor to argon 1:0.5, and the rapid pyrolysis process is started. The rapid pyrolysis temperature is 800℃. The ratio of water vapor to material mass (S / B ratio) during the entire pyrolysis stage is 1.0. Pyrolysis gas and glass fiber remaining in the fixed bed pyrolysis reactor are obtained.

[0051] S2. The pyrolysis gas and the mixed gasifying agent are passed into a periodic pulse Joule heating device for secondary Joule thermal reforming. The gas is contacted with a graphite carbon felt (a porous medium supported active metal catalyst) with a nickel-based catalyst and subjected to periodic pulse Joule heating. The pulse time of the periodic pulse Joule heating is 0.5s, the duty cycle is 25%, and the average temperature is 1000℃. The catalytic reforming is combined into gas components to obtain hydrogen-rich synthesis gas. The cooled and filtered hydrogen-rich synthesis gas is collected in a gas bag.

[0052] S3. Monitor the changes in the composition of the syngas in real time. When the concentration of active components such as H2 and CO drops to less than 1%, the pyrolysis is determined to be complete. After the pyrolysis is determined to be complete, stop the introduction of water vapor into the fixed bed pyrolysis reactor before cooling down and continue to introduce argon gas. After that, collect the glass fibers remaining in the fixed bed pyrolysis reactor after they have cooled naturally in an inert atmosphere.

[0053] The glass fiber prepared in this embodiment has a residual carbon content of 0.8% and a tensile strength retention rate of 98.3%; the collected hydrogen-rich synthesis gas contains 61.5% H2, 24.8% CO (H2 / CO=61.5%÷24.8%=2.48), and a carbon conversion rate of 95.5%.

[0054] The residual carbon content of the glass fiber was determined by thermogravimetric analysis (TGA) and is the mass percentage of carbon adhering to the glass fiber surface, expressed in wt%. Tensile strength retention rate refers to the ratio of the tensile strength of the recycled glass fiber to that of the virgin glass fiber. The calculation formula is: Tensile strength retention rate = (Recycled glass fiber tensile strength / Virgin glass fiber tensile strength) × 100%. The virgin glass fiber tensile strength is determined based on the glass fiber specifications obtained from the wind turbine blade model. H2 percentage and CO percentage refer to their volume percentages, respectively. The carbon conversion rate refers to the proportion of carbon elements in the decommissioned wind turbine blades converted into carbon in gaseous products.

[0055] The microstructure of the glass fiber obtained in this embodiment is shown in Figure 4. It can be seen that there is basically no obvious residual carbon adhering to the surface of the glass fiber, the fiber surface is smooth and intact, the surface cleanliness is high, and the structure is not significantly damaged. Together with the high value of tensile strength retention rate, this indicates that the method has a better protective effect on the glass fiber.

[0056] Example 3

[0057] The difference between this embodiment and Embodiment 2 is as follows:

[0058] In S1, the molar ratio of water vapor to inert gas during the pyrolysis stage is 1:1.0, the rapid pyrolysis temperature is 900℃, and the S / B ratio is 1.2.

[0059] The glass fiber prepared in this embodiment has a residual carbon content of 0.7% and a tensile strength retention rate of 98.6%; the collected hydrogen-rich synthesis gas contains 63.7% H2, 22.1% CO (H2 / CO=2.88), and a carbon conversion rate of 96.2%.

[0060] Example 4

[0061] The difference between this embodiment and Embodiment 2 is as follows:

[0062] In S1, the molar ratio of water vapor to inert gas during the pyrolysis stage is 1:0.2, and the S / B ratio is 1.5.

[0063] In S2, the graphite carbon felt is supported on an iron-based catalyst.

[0064] The glass fiber prepared in this embodiment has a residual carbon content of 1.0% and a tensile strength retention rate of 97.8%; the collected hydrogen-rich synthesis gas contains 59.4% H2, 27.3% CO (H2 / CO=2.88), and a carbon conversion rate of 96.2%.

[0065] Example 5

[0066] The difference between this embodiment and Embodiment 2 is as follows:

[0067] In S1, the rapid pyrolysis temperature is 900℃, and the ratio of water vapor consumed to the mass of the material is 1.5.

[0068] In S2, the pulse duration of the periodic pulse Joule heating is 0.5s, the duty cycle is 50%, and the average temperature is 1100℃.

[0069] The glass fiber prepared in this embodiment has a residual carbon content of 0.6% and a tensile strength retention rate of 98.0%; the collected hydrogen-rich synthesis gas contains 64.9% H2, 20.5% CO (H2 / CO=3.16), and a carbon conversion rate of 95.9%.

[0070] Comparative Example 1

[0071] The difference between this comparative example and Example 2 is as follows:

[0072] In S1, the rapid pyrolysis temperature is 650℃.

[0073] In S2, by adjusting the heating power, the average temperature is made to be 900℃ while keeping the pulse time 0.5s and the duty cycle 25% constant.

[0074] The glass fiber prepared in this comparative example had a residual carbon content of 4.2% and a tensile strength retention rate of 94.8%. The synthesis gas contained 23.6% H2 and 18.4% CO (H2 / CO=1.28), with a carbon conversion rate of 76.3%.

[0075] Figure 3 shows the microstructure of the glass fiber obtained in this comparative example. It can be seen that a large amount of carbon residue is attached to the surface of the glass fiber, and there are ablation, roughness and burr phenomena. This indicates that the low pyrolysis temperature and insufficient heat treatment intensity are not enough to achieve effective carbon removal and structural protection.

[0076] Comparative Example 2

[0077] The difference between this comparative example and Example 2 is as follows:

[0078] In S1, the rapid pyrolysis temperature is 700℃, and the ratio of water vapor consumed to the mass of the material is 0.8.

[0079] In S2, the pulse time is 0.2s, the duty cycle is 20%, and the average temperature is 800℃.

[0080] The glass fiber prepared in this comparative example had a residual carbon content of 1.0% and a tensile strength retention rate of 96.7%. The synthesis gas contained 28.4% H2 and 32.7% CO (H2 / CO=0.87), with a carbon conversion rate of 85.2%.

[0081] Data from Examples 2, 3, 4, Comparative Example 1, and Comparative Example 2 were compiled to obtain Table 1.

[0082] Table 1

[0083]

[0084] It can be seen that, compared with the comparative example, the glass fiber produced by using a better pyrolysis temperature, a better amount of gasifying agent, and a suitable catalyst combination in the example has a significantly reduced residual carbon content and a higher tensile strength retention rate. At the same time, the proportion of H2 in the hydrogen-rich synthesis gas increases significantly, and the H2 / CO ratio remains stable between 2.18 and 3.16. This indicates that the process has significant advantages in achieving high-value recovery of resources.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for the staged gasification and reforming recovery of decommissioned wind turbine blades, characterized in that, A staged gasification and reforming recovery device for retired wind turbine blades is adopted. This device includes an interconnected feeding device, a fixed-bed pyrolysis reactor, and a periodic pulse Joule heating device. The fixed-bed pyrolysis reactor is connected to both an inert gas source and a gasifying agent source. The periodic pulse Joule heating device contains a porous medium loaded with an active metal catalyst. The periodic pulse Joule heating device is connected to a cooling and filtration device. The device includes the following steps: S1, drying the retired wind turbine blade particles to a moisture content below 0.5 wt%, heating them to 700-900°C in an inert atmosphere, and then introducing steam for pyrolysis to obtain pyrolysis gas. The ratio of steam to inert gas during the pyrolysis stage is 1:(0.2-1.0), and the mass ratio of steam to retired wind turbine blade particles is 1.0-1.

5. No other components are involved in the pyrolysis stage. The water vapor from the reaction enters step S2 along with the pyrolysis gas to continue the reaction and be converted into hydrogen-rich syngas; S2, the pyrolysis gas is passed into a porous medium supported by an active metal catalyst and subjected to periodic pulsed Joule heating, with an average temperature of 900~1200℃ during the process, to obtain hydrogen-rich syngas; the periodic pulsed Joule heating method includes: using a periodic pulse heating method, with a pulse time of 0.1~1s and a duty cycle of 20%~50%; S3, the composition change of the syngas is monitored in real time, and when the concentration of active components H2 and CO drops to less than 1%, the pyrolysis is determined to be complete; after the pyrolysis is completed, the glass fiber is cooled and recovered in an inert atmosphere; in S2, the porous medium includes one or more of graphite carbon felt, foamed silicon carbide, and foamed carbon; the active metal catalyst includes one or more of iron-based, nickel-based, and cobalt-based catalysts.

2. The method for staged gasification and reforming recovery of decommissioned wind turbine blades as described in claim 1, characterized in that, The retired wind turbine blades are made of glass fiber reinforced composite material.

3. The method for staged gasification and reforming recovery of decommissioned wind turbine blades as described in claim 1, characterized in that, In S1, the method for preparing decommissioned wind turbine blade particles includes cutting and crushing the decommissioned wind turbine blades into particles with a particle size of less than 10 cm.

4. The method for staged gasification and reforming recovery of decommissioned wind turbine blades as described in claim 1, characterized in that, Drying methods include drying at 100~110℃ for more than 4 hours.

5. The method for staged gasification and reforming recovery of decommissioned wind turbine blades as described in claim 1, characterized in that, In S1, the inert atmosphere includes one or more of argon and helium.

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