A recycling and processing system for retired wind turbine blades

Abstract

The present invention provides a system for recycling and processing retired wind turbine blades. The system comprises at least two chain grates within a reactor: a first chain grate and a second chain grate. The first chain grate is positioned above the second chain grate in the direction of gravity. The reactor space above the first chain grate serves as a pyrolysis chamber, while the reactor space above the second chain grate serves as an oxidation chamber. A blade scrap inlet and a pyrolysis gas outlet are provided on the reactor wall of the pyrolysis chamber. A pyrolysis atmosphere gas inlet is provided on the chain of the first chain grate, while an oxidation gas inlet is provided on the second chain grate. A one-way material conveying device is provided between the discharge end of the first chain grate and the inner wall of the reactor. The first chain grate and the one-way material conveying device isolate the pyrolysis chamber from the oxidation chamber. The system can be widely applied to the processing of retired wind turbine blades, facilitating easy replacement and low-cost operation.

Description

Technical Field

[0001] The present invention relates to the technical field of waste recycling and treatment, in particular to the technical field of blade recycling and treatment of wind turbines used for wind power generation. Background Art

[0002] Wind power generation technology converts wind energy into electrical energy. With its increasing maturity, wind power generation has been widely used since the beginning of this century. Wind turbine blades are a core component of wind turbine equipment. Composite materials account for over 90% of the blade mass, primarily consisting of PVC, PET, and balsa wood. Wind turbine blades are subjected to harsh conditions, including strong wind loads and UV damage, and are inevitably subject to damage such as erosion, bending, delamination, and cracking. Therefore, wind turbine blades have a limited service life and typically need to be replaced before their service life is reached. As the service life of previously constructed wind turbine equipment reaches its limit, the effective disposal of retired wind turbine blades has become an increasingly important technical issue.

[0003] In the past, retired wind turbine blades were primarily disposed of by stacking and landfilling. This not only occupies a large amount of land but also releases toxic substances that contaminate soil and groundwater, causing serious environmental pollution and impacting human health. Currently, a more effective method for disposing of retired wind turbine blades is pyrolysis, which then recovers reusable glass fiber.

[0004] Existing pyrolysis methods for retired wind turbine blades are costly. For example, Chinese invention patent application number 202211330417.5, titled "System and Method for Recycling Wind Turbine Blades Using Waste Heat from Thermal Power Plants," discloses a method for processing wind turbine blades that requires transporting them to a thermal power plant for centralized processing, incurring significant transportation costs. Summary of the Invention

[0005] In order to solve the problem of high centralized processing and transportation costs in existing wind turbine blade recycling technologies, the present invention provides a retired wind turbine blade recycling and processing system.

[0006] The technical solutions of the present invention are as follows:

[0007] A system for recycling and processing retired wind turbine blades comprises a reactor; in the reactor, at least two chain grates are arranged: a first chain grate and a second chain grate; in the direction of gravity, the first chain grate is arranged above the second chain grate, the space in the reactor above the first chain grate is a pyrolysis space, and the space in the reactor above the second chain grate is an oxidation space; a blade fragment inlet and a pyrolysis gas outlet are provided on the wall of the reactor in the pyrolysis space; a pyrolysis atmosphere gas inlet device is provided on the chain of the first chain grate, and an oxidation gas inlet is provided on the second chain grate; a material one-way conveying device is provided between the discharge end of the first chain grate and the inner wall of the reactor; the first chain grate and the material one-way conveying device isolate the pyrolysis space from the oxidation space.

[0008] Optionally, the pyrolysis atmosphere gas inlet device includes a hollow columnar body arranged on the chain of the first chain grate; at least two through holes penetrating the wall of the columnar body are arranged on the columnar body: a first through hole and a second through hole; a spring is arranged between the columnar body and the chain; the columnar body moves through the chain as the spring expands and contracts; when the columnar body is not subject to external force, the first through hole and the second through hole are both located on one side of the chain; when the gravity of the blade fragments acts on the columnar body, the first through hole and the second through hole are respectively located on both sides of the chain.

[0009] Optionally, the first through hole and the second through hole are both provided on the side wall of the columnar body.

[0010] Optionally, the first chain grate includes a bearing layer for bearing the blade fragments and a non-bearing layer after the chain is turned over; the oxidation space is connected to the space between the bearing layer and the non-bearing layer.

[0011] Optionally, the pyrolysis gas outlet is communicated with an inlet of a pyrolysis gas pump disposed outside the reaction furnace.

[0012] Optionally, an air preheater is provided on the passage between the pyrolysis gas outlet and the pyrolysis gas pump; and a normal temperature air inlet and a preheated air outlet are provided on the air preheater.

[0013] Optionally, the preheated air outlet is connected to the oxidizing gas inlet.

[0014] Optionally, a control valve is provided on the passage between the preheated air outlet and the oxidizing gas inlet; the control valve controls the excess air coefficient of the air entering the oxidizing gas inlet to be between 1.2 and 1.5.

[0015] Optionally, the preheated air outlet is communicated with the combustion chamber.

[0016] Optionally, the outlet of the pyrolysis gas pump is connected to the combustion chamber.

[0017] Optionally, the combustion chamber is connected to the pyrolysis atmosphere gas inlet device.

[0018] Optionally, the combustion chamber is in communication with the oxidizing gas inlet.

[0019] Optionally, the outlet of the pyrolysis gas pump is connected to a gas generator.

[0020] The technical effects of the present invention are as follows:

[0021] The retired wind turbine blade recycling and processing system of the present invention is equipped with a pyrolysis space and an oxidation space in a reactor. After the wind turbine blade fragments undergo pyrolysis reaction in the pyrolysis space, they are transported to the oxidation space below by the first chain grate at its discharge end through a one-way material conveying device. Further oxidation reaction occurs in the oxidation space, and finally recyclable glass fiber is obtained. The pyrolysis gas generated by the pyrolysis of the wind turbine blade fragments in the pyrolysis space is burned to continuously provide heat for the oxidation reaction and pyrolysis reaction in the reactor. From the above description, it can be seen that the retired wind turbine blade recycling and processing system of the present invention can firstly significantly reduce the volume of the equipment by merging the pyrolysis space and the oxidation space in the reactor, compared with setting up the pyrolysis space and the oxidation space separately. Secondly, through the continuous operation of the first chain grate and the second chain grate, the continuous recycling and processing of wind turbine blades can be achieved, with high work efficiency. Thirdly, the combustion of the pyrolysis gas generated by the pyrolysis of the wind turbine blade fragments can provide the required heat for the operation of the reactor, saving the use of external fuel. The retired wind turbine blade recycling and processing system of the present invention has the above-mentioned characteristics of small size, high continuous processing efficiency, and low additional fuel requirement, so that the system can be transported to the wind power generation site by vehicle and directly recycle and process the retired wind turbine blades on site. Therefore, the transportation cost can be greatly reduced, and the purpose of the present invention can be achieved.

[0022] Further effects of the above optional manner will be described below in conjunction with specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 2 is a structural principle diagram of an embodiment of the present invention.

[0024] Figure 2 for Figure 1 Schematic diagram of the structure of the reactor as seen from the right side.

[0025] Figure 3 for Figure 1FIG. 1 is a front view of a first state in which pyrolysis atmosphere gas enters the device. FIG.

[0026] Figure 4 for Figure 3 A perspective view of the pyrolysis atmosphere gas inlet device is shown.

[0027] Figure 5 for Figure 1 A front view of a second state in which the pyrolysis atmosphere gas enters the device is shown.

[0028] Figure 6 for Figure 5 A perspective view of the pyrolysis atmosphere gas inlet device is shown.

[0029] Figure 7 The pyrolysis process flow chart of retired wind turbine blades is displayed in Aspen Plus software.

[0030] Figure 8 for Figure 7 The pyrolysis temperature and flue gas temperature change with the recirculation flue gas ratio in the simulated process flow.

[0031] The symbols in the figure are explained as follows:

[0032] 101. Crusher; 102. Blade material inlet; 103. Pyrolysis chamber; 104. Reactor; 105. Pyrolysis gas outlet; 106. Air lock; 107. Air preheater; 108. Pyrolysis gas pump; 109. Combustion chamber; 110. Gas generator; 111. Second chain grate; 112. Oxidation chamber; 113. First chain grate; 114. Pyrolysis atmosphere gas inlet device.

[0033] 201, second chain grate bearing layer; 202, first chain grate non-bearing layer; 203, first chain grate bearing layer; 301, top plate; 302, spring; 303, first through hole; 304, second through hole; 305, chain; 306, limiting ring. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is described in detail below with reference to the examples shown in the accompanying drawings.

[0035] Figure 1The schematic diagram shows the schematic structure of an embodiment of a retired wind turbine blade recycling and processing system according to the present invention. The retired wind turbine blade recycling and processing system includes a reactor 104. A blade fragmentation inlet 102 and a pyrolysis gas outlet 105 are provided on the reactor 104. A crusher 101 is also provided outside the reactor 104. The crusher 101 is used to crush retired wind turbine blades into blade fragments that meet the requirements. The blade fragments processed by the crusher 101 are transported into the reactor 104 through the blade fragmentation inlet 102. The pyrolysis gas outlet 105 is connected to the inlet of a pyrolysis gas pump 108, which is located outside the reactor 104. The pyrolysis gas outlet 105 is connected to the inlet of a pyrolysis gas pump 108, which is located outside the reactor 104. The pyrolysis gas pump 108 is used to provide power for gas flow. An air preheater 107 is provided in the passage between the pyrolysis gas outlet 105 and the pyrolysis gas pump 108. Specifically, the pipeline in the passage between the pyrolysis gas outlet 105 and the pyrolysis gas pump 108 forms a heat exchange surface at the air preheater 107. Air preheater 107 is provided with a normal-temperature air inlet and a preheated air outlet. Normal-temperature air enters the air preheater 107 through the normal-temperature air inlet, exchanges heat with the heat exchange surfaces, and then exits the preheated air outlet. The preheated air outlet is connected to the combustion chamber 109. The outlet of the pyrolysis gas pump 108 is also connected to the combustion chamber 109 and the gas generator 110.

[0036] like Figure 1 As shown, two chain grates are provided in the reaction furnace 104: a first chain grate 113 and a second chain grate 111. Figure 1 The first chain grate 113 is arranged above the second chain grate 111. The movement direction of the upper chain of the first chain grate 113 ( Figure 1 The horizontal direction is from left to right) and the movement direction of the upper chain of the second chain grate 111 ( Figure 1 The space in the reactor 104 above the first chain grate 113 in the direction of gravity is the pyrolysis space 103. The space above the second chain grate 111 in the direction of gravity and between the first chain grate 113 is the oxidation space 112. The blade material inlet 102 is set in the pyrolysis space 103 and is adjacent to the feeding end of the first chain grate 113 (i.e. Figure 1 The pyrolysis gas outlet 105 is arranged in the pyrolysis space 103 and is adjacent to the discharge end of the first chain grate 113 (i.e. Figure 1The right end of the first chain grate 113 in the reactor). An air lock 106 is provided between the discharge end of the first chain grate 113 and the inner side wall of the reactor 104. The air lock is a sealed and reliable one-way material conveying device composed of a rotating impeller with a cell, a body, and a reduction motor. When the impeller rotates in the body, the crushed materials falling from above enter the impeller cell from the feed port, and are sent to the discharge port of the air lock for discharge as the impeller rotates. During the entire working process, continuous quantitative feeding and unloading can be achieved. The purpose of the air lock is to prevent air crossflow from occurring when the crushed materials enter a space within a certain gas pressure range from a space within another gas pressure range, thereby maintaining the smooth circulation of the crushed materials. The air lock 106 and the first chain grate 113 isolate the pyrolysis space 103 from the oxidation space 112.

[0037] like Figure 1 As shown, a plurality of pyrolysis atmosphere gas inlet devices 114 are provided on the chain of the first chain grate 113. The pyrolysis atmosphere gas inlet devices 114 can connect the pyrolysis space 103 with the oxidation space 112, so that the gas in the oxidation space 112 enters the pyrolysis space 103 as pyrolysis atmosphere gas. An oxidizing gas inlet ( Figure 1 not shown).

[0038] like Figure 1 As shown, the preheated air outlet of the air preheater 107 is connected to the oxidizing gas inlet provided on the second chain grate 111, so that the preheated air enters the oxidation space 112 through the oxidizing gas inlet. A control valve ( Figure 1 (not shown), the control valve controls the excess air ratio of the air entering the oxidizing gas inlet (i.e., entering the oxidation space 112) to be between 1.2 and 1.5. The excess air ratio refers to the ratio of the amount of air actually entering the oxidation space 112 to the amount of air required for the oxidation reaction in the oxidation space 112.

[0039] like Figure 1 As shown, the combustion chamber 109 is communicated with the pyrolysis atmosphere gas inlet device 114. The combustion chamber 109 is also communicated with the oxidizing gas inlet provided on the second chain grate 111.

[0040] Figure 2 from Figure 1 The right side view shows the internal structure of the reactor 104. Figure 1 The first chain grate 113 includes a closed chain mounted on two rollers at the left and right ends. Figure 1 The upper chain part that carries the blade fragments is the first chain grate bearing layer 203, and the lower chain part after the roller is turned over is the first chain grate non-bearing layer 202. Figure 2 As shown, the width of the second chain grate 111 is greater than the width of the first chain grate 113, and the side wall of the reaction furnace 104 extends from the second chain grate 111 to the first chain grate bearing layer 203, so that the oxidation space 112 is connected with the space between the first chain grate bearing layer 203 and the first chain grate non-bearing layer 202.

[0041] Figures 3 to 6 The specific structure of the pyrolysis atmosphere gas inlet device provided on the first chain grate 113 of the retired wind turbine blade recycling and processing system of the present invention is shown. Figures 3 to 6 As shown, a plurality of pyrolysis atmosphere gas inlet devices are provided on the chain of the first chain grate 113 and are evenly distributed. Figure 3 and Figure 5 The up and down direction in is the direction of gravity. Figure 3 As shown, the pyrolysis atmosphere gas inlet device installed on the chain 305 (i.e., the chain installed on the first chain grate 113) includes a hollow cylinder. A flat plate, a top plate 301, is installed at one end of the cylinder to cover the end of the cylinder. The other end of the cylinder is installed through the chain 305, and a protruding limit ring 306 is installed on the side wall of the cylinder where it passes through the other side of the chain 305. The side wall of the cylinder is provided with several through holes: a first through hole 303 and a second through hole 304. The first through hole 303 and the second through hole 304 are respectively located adjacent to the two ends of the cylinder. A spring 302 is installed between the cylinder and the chain 305. Specifically, one end of the helical spring 302 is pressed against or fixedly connected to the top plate 301 fixed to the end of the cylinder; the other end of the spring 302 is pressed against or fixedly connected to the chain 305.

[0042] Figure 3 and Figure 4 The diagram shows the state when no blade fragments exert a gravitational force on top plate 301. At this point, spring 302 is extended, first through-hole 303 and second through-hole 304 are both located above chain 305, and retaining ring 306 limits the expansion and contraction of the cylinder to ensure it cannot completely separate from chain 305. In this state, both sides of chain 305 are prevented from allowing pyrolysis atmosphere gas to enter the device and become conductive.

[0043] Figure 5 and Figure 6 The diagram shows the state when blade fragments (not shown) exert a gravitational force on top plate 301. At this point, spring 302 is compressed, and first through-hole 303 and second through-hole 304 are located above and below chain 305, respectively. Pyrolysis atmosphere gas enters the device and flows through both sides of chain 305.

[0044] The working process of the embodiment shown in the accompanying drawings is described below to further illustrate the technical solution of the present invention.

[0045] like Figure 1 As shown, the crusher 101 crushes the retired wind turbine blades into blade fragments that meet the requirements, and then transports the blade fragments into the pyrolysis space 103 of the reaction furnace 104 through the blade fragment inlet 102. Specifically, the blade fragments fall on the feeding end of the first chain grate 113, and then the blade fragments move from left to right ( Figure 1 Move slowly in the left and right directions. Figures 3 to 6 When the blade fragments fall onto the first chain grate support layer 203, they exert a gravitational force on the top plate 301. Consequently, the weight of the blade fragments compresses the spring 302, placing the first through-hole 303 and the second through-hole 304 on the upper and lower sides of the chain 305, respectively. Therefore, the pyrolysis atmosphere gas below the chain 305 can sequentially pass through the second through-hole 304 and the first through-hole 303 into the pyrolysis space 103. After passing through the first through-hole 303, the pyrolysis atmosphere forms a pyrolysis atmosphere in the pyrolysis space 103, causing the blade fragments stacked on the first chain grate support layer 203 to undergo a pyrolysis reaction. As the chains of the first chain grate support layer 203 slowly move from left to right, the pyrolysis reaction proceeds fully. By the time the blade fragments reach the discharge end of the first chain grate 113, the corresponding blade fragments have already completed pyrolysis. The blade fragments that have completed the pyrolysis reaction fall into the air lock 106 as the chain on the first chain grate 113 turns over, and then enter the oxidation space 112 below through the air lock 106, specifically falling on the second chain grate bearing layer 201.

[0046] The chain on the second chain grate bearing layer 201 moves slowly from right to left, and the blade fragments to be oxidized move with it. The oxidizing gas inlet provided on the chain on the second chain grate bearing layer 201 introduces oxidizing gas (in this embodiment, the oxidizing gas is air, and the oxidation reaction is carried out using the oxygen in the air) into the oxidation space 112. After passing through the oxidizing gas inlet, the air undergoes an oxidation reaction with the blade fragments to be oxidized stacked on the second chain grate bearing layer 201. The second chain grate bearing layer 201 moves slowly from right to left. As the second chain grate bearing layer 201 moves, the oxidation reaction of the blade fragments to be oxidized thereon continues until they are separated from the second chain grate bearing layer 201, and recycled materials such as glass fibers that have completed the oxidation reaction are obtained.

[0047] The following is a detailed description of the gas flow in the retired wind turbine blade recycling and processing system.

[0048] The pyrolysis gas pump 108 provides power for the gas flow within the retired wind turbine blade recycling and processing system. Driven by the pyrolysis gas pump 108, the pyrolysis gas after pyrolysis in the pyrolysis space 103 is discharged from the pyrolysis space 103 through the pyrolysis gas outlet. The exhausted pyrolysis gas passes through the heat exchange surface in the air preheater 107 and exchanges heat with the normal temperature air introduced by the air preheater 107, thereby preheating the normal temperature air. Part of the preheated air enters the combustion chamber 109 to assist combustion, and the other part enters the oxidation space 112 through the oxidation gas inlet on the second chain grate bearing layer 201, thereby increasing the temperature in the oxidation space 112 and accelerating the oxidation reaction.

[0049] The pyrolysis gas pump 108 guides the pyrolysis gas that has passed through the air preheater 107 to flow further. Part of the pyrolysis gas is introduced into the combustion chamber 109, and the other part is introduced into the gas generator 110. The pyrolysis gas introduced into the gas generator 110 is used to generate electricity for use in the retired wind turbine blade recycling and processing system. The pyrolysis gas entering the combustion chamber 109 is mixed with the preheated air and burned. The pyrolysis reaction carried out in the pyrolysis space 103 is mainly the thermal cracking of the high-molecular organic matter in the wind turbine blade material. The products are mainly C, H2, H2O, CO, CO2, CH4, tar and other hydrocarbon substances, which can be approximately expressed by the chemical equation:

[0050] CHxOy=n1C+n2H2+n3H2O+n4CO+n5CO2+n6CH4

[0051] Therefore, the pyrolysis gas discharged from the pyrolysis space 103 can be burned in the combustion chamber 109. A portion of the high-temperature gas generated after combustion enters the pyrolysis space 103 through the pyrolysis atmosphere gas inlet device 114, providing heat for the pyrolysis reaction. Another portion of the high-temperature gas enters the oxidation space 112 through the oxidation gas inlet port on the second chain grate support layer 201, providing heat for the oxidation reaction. The oxidation reaction is the oxidation of carbon in the pyrolyzed material to produce CO2, which is a carbon elimination reaction.

[0052] The oxygen content of the gas after the oxidation reaction is reduced and the temperature is higher, so it can be reused. Figure 2 The gas that has completed the oxidation reaction in the oxidation space 112 cannot pass through the first chain grate non-bearing layer 202, because the pyrolysis atmosphere gas on the first chain grate non-bearing layer 202 enters the device in Figure 3 As shown in the closed state. Figure 2 As shown, the oxidation space 112 is connected to the space between the first chain grate bearing layer 203 and the first chain grate non-bearing layer 202. Therefore, the gas that completes the oxidation reaction in the oxidation space 112 can still enter the device through the pyrolysis atmosphere gas on the first chain grate bearing layer 203 (the pyrolysis atmosphere gas entering the device at this time is in the Figure 5The pyrolysis space 103 is opened (in the open state shown). Since the excess air coefficient of the air entering the oxidation space 112 is controlled between 1.2 and 1.5, and the pyrolysis space 103 and the oxidation space 112 are separated (so that the gas entering the oxidation space 112 can have sufficient residence time to react), the oxygen content of the gas that completes the oxidation reaction in the oxidation space 112 is low. After entering the pyrolysis space 103, the atmosphere of the pyrolysis space 103 can still be kept as a reducing atmosphere, so that the pyrolysis reaction can proceed smoothly and the heat generated by the oxidation reaction is fully utilized.

[0053] In the decommissioned wind turbine blade recycling and processing system of the present invention, the pyrolysis reaction conditions are: a reaction temperature of 500-800°C and a reaction time of 10-30 minutes. The proportion of pyrolysis gas generated by pyrolysis returned to the reactor 104 is 40%-80%. The oxidation reaction temperature is 500-800°C and the oxidation time is 5-15 minutes. The blade fragments obtained by the crusher 101 after shredding the wind turbine blades have a length of ≤50 mm, a width of ≤50 mm, and a thickness of ≤15 mm.

[0054] In order to verify the technical effect of the retired wind turbine blade recycling and processing system of the present invention, a process flow model was established using Aspen Plus software for simulation. Figure 7 The pyrolysis process flow chart of retired wind turbine blades is shown in Aspen Plus software. Figure 7 The process flow shown is described below.

[0055] Decomposition module (DECOMP)

[0056] Since Aspen Plus software cannot identify the components of wind turbine blades, the decomposition module uses RYield reactor simulation to convert wind turbine blade (BLADE) materials into C, H, O, N, S, ash and moisture that can participate in subsequent simulations. The decomposition products are ELEMENTS.

[0057] Separation module (CSEP1)

[0058] The separation module separates the decomposition products ELEMENTS into the carbon (CCONV) that does not participate in the pyrolysis reaction and the part (ELEM2) that participates in the pyrolysis reaction.

[0059] Pyrolysis module (PYRO)

[0060] After ELEM2 is introduced into the pyrolysis module, pyrolysis products (PYROOUT) are produced.

[0061] Combustion Module (COMBUST)

[0062] After the ELEM2 is introduced into the pyrolysis module, pyrolysis products (PYROOUT) are generated. The pyrolysis products and air (AIR) enter the combustion module for combustion reaction, and the combustion product (FLUEGAS) is high-temperature flue gas.

[0063] Mixed module (MIX)

[0064] The unreacted carbon and combustion products are mixed through a mixing module, and the mixed product (FLUEGASM) is separated into part of the flue gas (BACKFLUE) through a diversion module to provide energy for the pyrolysis reaction, and the rest is discharged as system exhaust (OUT) through a diversion module (SEP).

[0065] Figure 7 The boundary conditions of the pyrolysis process model shown in Aspen Plus are shown in the table below.

[0066]

[0067] like Figure 8 As shown in the figure, by adjusting the ratio of the return flue gas, the pyrolysis temperature can be adjusted. When the ratio of the return flue gas increases from 0.4 to 0.8, the pyrolysis temperature increases from 267°C to 867°C. When the ratio of the return flue gas is 66%, the pyrolysis temperature is 600°C, which has reached the temperature required for the pyrolysis of wind turbine blade materials. It can be seen that the combustion of the post-pyrolysis products can provide enough heat for the pyrolysis reaction to maintain the pyrolysis reaction. Figure 7 and Figure 8 As can be seen from the simulated structure, using the retired wind turbine blade recycling and processing system of the present invention to process retired wind turbine blades, the combustion of pyrolysis gas utilizes the heat inherent in the blades to maintain the system's reactions, significantly reducing reliance on external energy sources. Furthermore, the oxidation reaction itself generates heat, which further provides the heat required for the pyrolysis reaction in the retired wind turbine blade recycling and processing system of the present invention. Consequently, more pyrolysis gas can be used to generate electricity for gas-fired generator 110. In other words, the retired wind turbine blade recycling and processing system of the present invention can utilize the heat from the oxidation reaction, achieving higher energy efficiency.

[0068] As can be seen from the working process and process flow of the above-mentioned embodiments of the present invention, the system of the present invention is small in size and can be easily transported to the wind power plant site for construction, thereby reducing costs. Secondly, the present invention can achieve continuous recycling and processing of wind turbine blades, with high working efficiency. Thirdly, the energy generated by the oxidation reaction and pyrolysis reaction can be fully utilized to maintain the system's reactions and power the system, so that the system requires less external energy for operation. On the one hand, this reduces operating costs and transportation costs, and on the other hand, it is more convenient for work to be carried out in frequently changing locations.

[0069] The retired wind turbine blade recycling and processing system of the present invention burns the pyrolysis gas generated by pyrolysis, avoiding the direct incineration of the blades to generate pollutants such as dioxins, which pollute the environment and harm human health. The present invention can flexibly allocate the ratio of pyrolysis gas for incineration and power generation based on the composition of the blades, meeting the heat required for the pyrolysis reaction while also meeting the power needs of auxiliary equipment. The additional electricity can be connected to the grid to generate revenue. At the same time, the present invention recycles the high-value-added glass fiber in the wind turbine blades. The obtained glass fiber is intact and retains its high strength characteristics. It can be directly used in cement clinker and can also be used as a reinforcement material in composite materials. The fiber in the blades is recovered nearly losslessly with a high recovery rate, which can realize the resource processing of retired wind turbine blades. The retired wind turbine blade recycling and processing system of the present invention can adjust the pyrolysis temperature and pyrolysis rate by adjusting the ratio of the reflowing pyrolysis gas. At the same time, the pyrolysis reaction and oxidation reaction are carried out in two separate spaces, avoiding the risk of explosion caused by the introduction of air during the pyrolysis reaction when recycling wind turbine blades using the currently commonly used pyrolysis method. The pyrolysis reaction of the present invention is carried out at a lower temperature and in a reducing atmosphere, which can effectively curb the generation of harmful substances such as dioxins.

[0070] It is worth noting that the above description is merely a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. The present invention may also be replaced by equivalent technologies. Therefore, any equivalent changes made by applying the description and illustrations of the present invention, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A retired wind turbine blade recycling and processing system, characterized by: The invention comprises a reaction furnace; in the reaction furnace, at least two chain grates are arranged: a first chain grate and a second chain grate; In the direction of gravity, the first chain grate is arranged above the second chain grate, the space in the reaction furnace above the first chain grate is a pyrolysis space, and the space in the reaction furnace above the second chain grate is an oxidation space; a blade fragment inlet and a pyrolysis gas outlet are provided on the wall of the reaction furnace in the pyrolysis space; a pyrolysis atmosphere gas inlet device is provided on the chain of the first chain grate, and an oxidation gas inlet is provided on the second chain grate; a material one-way conveying device is provided between the discharge end of the first chain grate and the inner wall of the reaction furnace; the first chain grate and the material one-way conveying device isolate the pyrolysis space from the oxidation space; The pyrolysis atmosphere gas inlet device includes a hollow columnar body arranged on the chain of the first chain grate; at least two through holes penetrating the wall of the columnar body are arranged on the columnar body: a first through hole and a second through hole; a spring is arranged between the columnar body and the chain; the columnar body moves through the chain as the spring expands and contracts; when the columnar body is not subject to external force, the first through hole and the second through hole are both located on one side of the chain; when the gravity of the blade fragments acts on the columnar body, the first through hole and the second through hole are respectively located on both sides of the chain.

2. The retired wind turbine blade recycling and processing system according to claim 1, characterized in that: The first through hole and the second through hole are both arranged on the side wall of the columnar body.

3. The retired wind turbine blade recycling and processing system according to claim 1, characterized in that: The first chain grate includes a bearing layer for bearing the blade fragments and a non-bearing layer after the chain is turned over; the oxidation space is connected to the space between the bearing layer and the non-bearing layer.

4. The retired wind turbine blade recycling and processing system according to claim 1, characterized in that: The pyrolysis gas outlet is communicated with an inlet of a pyrolysis gas pump disposed outside the reaction furnace.

5. The retired wind turbine blade recycling and processing system according to claim 4, characterized in that: An air preheater is provided on the passage between the pyrolysis gas outlet and the pyrolysis gas pump; and a normal temperature air inlet and a preheated air outlet are provided on the air preheater.

6. The retired wind turbine blade recycling and processing system according to claim 5, characterized in that: The preheated air outlet is in communication with the oxidizing gas inlet.

7. The retired wind turbine blade recycling and processing system according to claim 6, characterized in that: A control valve is provided on the passage between the preheated air outlet and the oxidizing gas inlet; the control valve controls the excess air coefficient of the air entering the oxidizing gas inlet to be between 1.2 and 1.

5.

8. The retired wind turbine blade recycling and processing system according to claim 5, characterized in that: The preheated air outlet is communicated with the combustion chamber.

9. The retired wind turbine blade recycling and processing system according to claim 8, characterized in that: The outlet of the pyrolysis gas pump is communicated with the combustion chamber.

10. The retired wind turbine blade recycling and processing system according to claim 8, characterized in that: The combustion chamber is in communication with the pyrolysis atmosphere gas inlet device.

11. The retired wind turbine blade recycling and processing system according to claim 8, characterized in that: The combustion chamber is in communication with the oxidizing gas inlet.

12. The retired wind turbine blade recycling and processing system according to claim 4, characterized in that: The outlet of the pyrolysis gas pump is communicated with the gas generator.

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