System and method for recycling long glass fibers by cutting and pyrolyzing wind power blades

Abstract

The invention discloses a system and a method for recycling long glass fibers through pyrolysis of wind power blade blocks, and belongs to the technical field of solid waste treatment. A preheating chamber, a pyrolysis chamber, an oxidation chamber, a combustion chamber and a conveying mechanism are matched with one another to pyrolyze the large wind power blade blocks. By adopting the technical scheme, the heating uniformity of the wind power blade block in the pyrolysis process can be improved, a compact carbon layer is prevented from being formed on the surface of the wind power blade block to hinder heat transfer, meanwhile, energy consumption in the regenerated glass fiber oxidation carbon removal process is reduced, and the length and quality of regenerated glass fibers are improved; and high-efficiency and high-quality recovery of the glass fibers in the waste wind turbine blades is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid waste treatment, and in particular relates to a system and method for pyrolyzing and recovering long glass fibers from cut wind turbine blades. Background Art

[0002] With the advent of the retirement tide of wind turbines and the accelerated promotion of "replacing small with large" turbines, the output of emerging solid wastes such as wind turbine blades has increased year by year. Wind turbine blades are usually made of corrosion-resistant thermosetting resin-based fiber-reinforced composite materials, which cannot be melted or reshaped, and are difficult to degrade naturally. At present, the recycling technologies of discarded wind turbine blades include mechanical methods, energy recovery methods (incineration power generation / heating), cement kiln co-processing methods, pyrolysis methods and chemical dissolution methods. The pyrolysis method, which uses thermal decomposition of organic polymers as the main process, is not limited by the type of raw materials, and can achieve dual recycling of inorganic fibers and organic resin materials. It is considered to be the technology with the most promising industrial application prospects.

[0003] In the prior art, for example, the utility model patent with publication number CN219012762U discloses a propulsion-type wind turbine blade processing furnace, which is a fixed bed type and adopts continuous feeding. The wind turbine blades that are simply cut into large pieces can be pyrolyzed and gasified in the furnace to recover long glass fibers. The invention patent with publication number CN117259408A discloses a pyrolysis device and a pyrolysis method for waste wind turbine blades, which are continuously fed through a chain plate transmission mechanism. Due to the large volume and uneven thickness of the wind turbine blades in the above two patents, the pyrolysis process is prone to uneven heating, and the pyrolysis of some areas with poor heating is relatively slow; in addition, impurities such as tar and carbon deposits generated during the pyrolysis process will cover the surface of the wind turbine blades to form a dense carbon layer that hinders heat transfer, so the pyrolysis time is long and the pyrolysis efficiency is low. At the same time, recycled glass fibers with carbon-containing impurities are difficult to utilize and usually require an additional oxidation step for purification. Due to the large amount of carbon-containing impurities, the oxidation process is time-consuming and energy-intensive. The long-term exposure of recycled glass fibers to a high-temperature oxidation environment greatly damages their mechanical properties, so the quality of the recycled glass fibers is poor. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a system and method for pyrolyzing and recovering long glass fibers from wind turbine blade blocks, which can improve the uniformity of heating of wind turbine blade blocks during the pyrolysis process and prevent the formation of a dense carbon layer on the surface of the wind turbine blade blocks that hinders heat transfer. At the same time, removing the carbon layer during the pyrolysis process can shorten the time of the oxidation and decarbonization process of the regenerated glass fibers, reduce energy consumption, improve the quality of the regenerated glass fibers, and achieve efficient and high-quality recovery of glass fibers from discarded wind turbine blades.

[0005] In order to achieve the above-mentioned object, the present invention provides a system for pyrolyzing and recovering long glass fibers from wind turbine blade cut pieces, comprising a preheating chamber, a pyrolysis chamber, an oxidation chamber, a combustion chamber and a conveying mechanism, wherein:

[0006] The preheating chamber is used to load and preheat the wind turbine blade blocks. A loading port is provided at the feeding end of the preheating chamber, and the discharging end of the preheating chamber is connected to the pyrolysis chamber.

[0007] The pyrolysis chamber is used to provide a pyrolysis environment for the wind turbine blade cut pieces. The pyrolysis chamber is provided with a pyrolysis auxiliary component, an infrared thermal imager, a controller and a baffle. The pyrolysis auxiliary component is used to make the wind turbine blade cut pieces heat evenly and reduce the carbon deposits and tar adhesion on the surface of the recycled glass fiber. A gas outlet is provided at the top center of the pyrolysis chamber. The gas outlet is connected to the combustion chamber. The opening / closing of the gas outlet is controlled by a valve. The discharge end of the pyrolysis chamber is connected to the oxidation chamber. The discharge end of the pyrolysis chamber and the discharge end of the preheating chamber are respectively provided with sealed furnace doors. The preheating chamber and the pyrolysis chamber are connected / isolated by opening / closing the sealed furnace door at the discharge end of the preheating chamber. The pyrolysis chamber and the oxidation chamber are connected / isolated by opening / closing the furnace door at the discharge end of the pyrolysis chamber.

[0008] The oxidation chamber is used to remove carbon from the long glass fibers obtained by pyrolysis. A first heat exchanger is arranged on the top of the oxidation chamber. The first heat exchanger is used to heat the low-temperature carbon dioxide into medium-temperature carbon dioxide. The medium-temperature carbon dioxide is injected into the preheating chamber to provide a preheating environment.

[0009] The combustion chamber is used to provide the heat source required by the pyrolysis chamber. The side wall of the combustion chamber is arranged with a burner and an air inlet. The top of the combustion chamber is arranged with a second heat exchanger. The medium-temperature carbon dioxide is also used to enter the second heat exchanger to continue to heat up to high-temperature carbon dioxide. An air preheater is arranged in the flue of the combustion chamber. The cold air enters the oxidation chamber after being heated by the air preheater.

[0010] The conveying mechanism is used to convey the cut wind turbine blades. A wind chamber is arranged at the bottom of the conveying mechanism. The conveying mechanism passes through the preheating chamber, the pyrolysis chamber and the oxidation chamber. The conveying mechanism located in the pyrolysis chamber performs reciprocating motion during operation.

[0011] Preferably, the pyrolysis auxiliary component includes a first driving member, an operating arm, a brush holder, bristles, an air pump and an air path control component, one end of the operating arm is connected to the first driving member, the first driving member is arranged along the width direction of the conveying mechanism, the first driving member is used to drive the operating arm to move, the operating arm is fixedly connected to the brush holder at one end away from the first driving member, the operating arm and the brush holder are connected by a telescopic driving rod, the brush holder is a double-layer structure, the double-layer structures are connected by elastic members, the double-layer structures are provided with a plurality of holes for air flow to pass through, a plurality of bristles are fixedly connected to the bottom of the brush holder, the bristles are made of heat-resistant material, the air pump is located at the top of the pyrolysis chamber, the air pump is used to introduce hot air flow and control the output air flow intensity, the top of the brush holder is connected to the air path control component, the air path control component is connected to the air pump through an air pipe, and the air path control component is used to blow the input air flow out between the bristles.

[0012] Preferably, the infrared thermal imager is arranged on the top wall of the pyrolysis chamber, and the infrared thermal imager is used to obtain the contour and infrared thermal image of the cut wind turbine blades on the conveying mechanism.

[0013] Preferably, the controller is used to increase the wind force of the wind pump based on the infrared thermal image of the wind turbine blade segment when the operating arm passes through the low temperature area of ​​the wind turbine blade segment. The controller obtains the contour of the wind turbine blade segment through grayscale image edge detection, and controls the first driving member and the telescopic driving rod based on the contour of the wind turbine blade segment so that the wind frame always remains at a fixed distance above the wind turbine blade segment.

[0014] Preferably, the baffles are located on both sides of the conveying mechanism, the baffles are fixedly connected to the inner wall of the pyrolysis chamber, a plurality of guide slots are opened on the baffles, a carbon hopper is fixedly connected to the bottom of the baffles, and the guide slots are connected to the carbon hopper.

[0015] Preferably, the valve is one of a relief valve, a pressure reducing valve and a sequence valve.

[0016] Preferably, the conveying mechanism is a combination of one or more of a scale-type chain grate, a beam-type chain grate and a chain-belt chain grate.

[0017] Preferably, the conveying mechanism further includes a flipping mechanism, which is used to flip the wind turbine blade blocks. The flipping mechanism consists of a second driving member and a flap. The output shaft of the second driving member is fixedly connected to the flap, and the flap is fitted to the conveying mechanism.

[0018] Preferably, the number of the pyrolysis auxiliary components is at least 2, and the pyrolysis auxiliary components are respectively arranged on both sides of the turning mechanism along the conveying mechanism.

[0019] This solution also provides a method for pyrolyzing and recovering long glass fibers from wind turbine blade cut pieces based on any of the above items, which comprises the following steps:

[0020] S1, loading wind turbine blade blocks through a loading port by manual loading, and the blocks are sent into the pyrolysis chamber through a conveying mechanism after being preheated in the preheating chamber;

[0021] S2, at the initial start-up, the combustible gas is transported to the combustion chamber, and the high-temperature flue gas generated by the combustion is heat exchanged with the medium-temperature carbon dioxide through the second heat exchanger. The carbon dioxide is heated to a high temperature of 600-700℃ and then sent to the pyrolysis chamber through the wind chamber and valve. When the flue gas is discharged through the flue, it heats the cold air in the air preheater, and the generated hot air enters the oxidation chamber;

[0022] S3, adding wind turbine blade blocks through the feeding port at a feeding rate of 6-10 blocks / h, and controlling the transmission rate of the conveying mechanism so that the wind turbine blades stay in the preheating chamber for 0.5-1h and stay in the pyrolysis chamber for 1-2h. During the pyrolysis process, the conveying mechanism reciprocates, and the upper and lower surfaces of the wind turbine blade blocks are brought into contact with the pyrolysis auxiliary components through the flipping mechanism to remove impurities such as carbon deposits and tar on the surface. The volatile matter generated by the pyrolysis enters the combustion chamber for combustion, and the supply of combustible gas to the combustion chamber is stopped after the temperatures of the preheating chamber, the pyrolysis chamber and the oxidation chamber are stabilized;

[0023] S4, open the sealed furnace door at the discharge end of the pyrolysis chamber, and the conveying mechanism delivers the long glass fibers obtained after pyrolysis into the oxidation chamber. After staying for 0.5-1h, the regenerated glass fibers after oxidation and carbon removal are discharged through the discharge port. The flue gas generated during the oxidation process heats the low-temperature carbon dioxide to a medium temperature of 200-300°C through the first heat exchanger;

[0024] S5, medium-temperature carbon dioxide is sent into the preheating chamber through the wind chamber to preheat the loaded wind turbine blade blocks.

[0025] The beneficial effects of the present invention include at least:

[0026] 1. The present invention can pyrolyze large pieces of discarded wind turbine blades to achieve the recovery of long-sized, high-quality glass fibers.

[0027] 2. The operating arm will continuously reciprocate during the pyrolysis process, driving the bristles on the brush holder to remove impurities such as tar and carbon deposits generated during the pyrolysis process from the surface of the wind turbine blades, preventing the formation of a dense carbon layer on the surface that hinders heat transfer, so that the inside of the wind turbine blade blocks can fully contact the hot air flow and improve the pyrolysis efficiency.

[0028] 3. Through the detection of infrared thermal imager, the low-temperature area of ​​wind turbine blades can be located. When the operating arm moves to the low-temperature area, the air pump can accelerate the heat exchange in the low-temperature area by increasing the hot air flow, so that the wind turbine blade blocks are heated evenly, the pyrolysis efficiency is improved, and the internal stress of the recycled glass fiber caused by uneven heating is alleviated.

[0029] 4. Wind turbine blades are glass fiber reinforced resin-based composite materials. During the pyrolysis process, the organic resin filled between the glass fibers undergoes thermal decomposition, and the glass fibers are gradually exposed and present a porous structure. The hot air flow injected by the wind pump can better enter the pores between the glass fibers, thereby heating the inner layer of the wind turbine blades and removing impurities such as tar and carbon deposits in the pores, enhancing heat transfer while working with the bristles to remove impurities.

[0030] 5. A large amount of carbon particles will adhere to the bristles in the process of removing impurities. The hot air flow blown out by the air pump can promote the falling of the carbon particles, thereby cleaning the bristles.

[0031] 6. Since the pyrolysis process removes most of the carbon-containing impurities attached to the surface of the glass fiber, the time of the oxidation process can be greatly shortened, the energy consumption of the oxidation process can be reduced, and the mechanical properties of the recycled glass fiber can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of a system according to an embodiment of the present invention.

[0033] Figure 2 It is an axial schematic diagram of a pyrolysis chamber according to an embodiment of the present invention.

[0034] Figure 3 for Figure 2 Schematic diagram of the front view structure.

[0035] Figure 4 It is a cross-sectional axial schematic diagram of a pyrolysis chamber according to an embodiment of the present invention.

[0036] Figure 5 for Figure 4 Enlarged schematic diagram of part A.

[0037] Figure 6 Schematic diagram of system logic of an embodiment of the present invention.

[0038] Figure 7 Schematic diagram of the method steps of an embodiment of the present invention.

[0039] The figure marks in the drawings of the specification include: pyrolysis chamber 1, combustion chamber 2, conveying mechanism 3, first driving member 4, operating arm 5, brush holder 6, bristles 7, air pump 8, air path control component 9, infrared thermal imager 10, baffle 11, guide slot 12, charcoal bucket 13, telescopic driving rod 14, elastic member 15, hole 16, second driving member 17, flap 18, preheating chamber 19, oxidation chamber 20, burner 21, first heat exchanger 22, second heat exchanger 23, wind chamber 24, valve 25, air preheater 26. DETAILED DESCRIPTION

[0040] The following is further described in detail through specific implementation methods:

[0041] The embodiment is basically as shown in the attached Figure 1 To Attachment Figure 7 As shown:

[0042] Embodiment 1:

[0043] A system for pyrolyzing and recovering long glass fibers from cut wind turbine blades comprises: a preheating chamber 19, a pyrolysis chamber 1, an oxidation chamber 20, a combustion chamber 2 and a conveying mechanism 3.

[0044] The preheating chamber 19 is used to load and preheat the cut wind turbine blades. A loading port is provided at the feeding end of the preheating chamber 19 , and the discharging end of the preheating chamber 19 is connected to the pyrolysis chamber 1 .

[0045] The pyrolysis chamber 1 is used to provide a pyrolysis environment for cutting wind turbine blades. The pyrolysis chamber 1 is provided with a pyrolysis auxiliary component, an infrared thermal imager 10, a controller and a baffle 11. The pyrolysis auxiliary component, the infrared thermal imager 10 and the controller are all provided with an insulation or cooling structure for adapting to the high temperature environment of pyrolysis.

[0046] A gas outlet is provided at the center of the top of the pyrolysis chamber 1, and the gas outlet is connected to the combustion chamber 2. The opening / closing of the gas outlet is controlled by a valve 25. The discharge end of the pyrolysis chamber 1 is connected to the oxidation chamber 20. The discharge end of the pyrolysis chamber 1 and the discharge end of the preheating chamber 19 are respectively provided with sealed furnace doors. The preheating chamber 19 and the pyrolysis chamber 1 are connected / isolated by opening / closing the sealed furnace door at the discharge end of the preheating chamber 19, and the pyrolysis chamber 1 and the oxidation chamber 20 are connected / isolated by opening / closing the furnace door at the discharge end of the pyrolysis chamber 1.

[0047] The oxidation chamber 20 is used to remove carbon and purify the long glass fibers obtained by pyrolysis. A first heat exchanger 22 is arranged on the top of the oxidation chamber 20. The first heat exchanger 22 is used to heat the low-temperature carbon dioxide into medium-temperature carbon dioxide, and the medium-temperature carbon dioxide is used to be injected into the preheating chamber 19 to provide a preheating environment.

[0048] The combustion chamber 2 is used to provide the heat source required by the pyrolysis chamber 1. A burner 21 and an air inlet are arranged on the side wall of the combustion chamber 2. A second heat exchanger 23 is arranged on the top of the combustion chamber 2. The medium-temperature carbon dioxide is also used to enter the second heat exchanger 23 to continue to heat up to high-temperature carbon dioxide. An air preheater 26 is arranged in the flue of the combustion chamber 2. The cold air enters the oxidation chamber 20 after being heated by the air preheater 26.

[0049] The conveying mechanism 3 is used to convey the cut wind turbine blades. A wind chamber 24 is arranged at the bottom of the conveying mechanism 3. The conveying mechanism 3 passes through the preheating chamber 19, the pyrolysis chamber 1 and the oxidation chamber 20. The conveying mechanism 3 located in the pyrolysis chamber 1 reciprocates during the pyrolysis auxiliary work.

[0050] When in use, the wind turbine blades are first cut into several large blocks. The loader works in front of the preheating chamber 19 and intermittently places the wind turbine blade blocks on the conveying mechanism 3. The conveying mechanism 3 is used to convey the wind turbine blade blocks. The wind turbine blade blocks first enter the preheating chamber 19 and are preheated to 100-150°C before pyrolysis. Then the wind turbine blade blocks are continuously conveyed into the pyrolysis chamber 1 along with the conveying mechanism 3. The pyrolysis chamber 1 provides a high temperature of 500-600°C to pyrolyze the resin and other organic matter in the wind turbine blade blocks into gas, thereby separating them from the solid glass fiber and realizing the recycling of the glass fiber.

[0051] After the pyrolysis is completed, the glass fiber is sent into the oxidation chamber 20 through the conveying mechanism 3. At this time, the glass fiber maintains a relatively high temperature and the surface is covered with carbon-containing impurities. After the glass fiber enters the oxidation chamber 20, the carbon-containing impurities on the surface are removed by combustion.

[0052] The high temperature flue gas generated by the combustion in the oxidation chamber 20 heats the low temperature carbon dioxide to medium temperature carbon dioxide of 200-300°C through the first heat exchanger 22. The medium temperature carbon dioxide is respectively introduced into the preheating chamber 19 as a preheating heat source, or introduced into the combustion chamber 2 to be further heated to a high temperature of 600-700°C, so as to enter the pyrolysis chamber 1 to provide a high temperature environment for pyrolysis.

[0053] The combustion chamber 2 is used to burn the pyrolysis gas and pyrolysis oil (collectively referred to as volatile matter) produced by the pyrolysis of wind turbine blade segments to generate heat. When the flue gas is discharged through the flue, it heats the cold air in the air preheater 26, and the generated hot air enters the oxidation chamber 20.

[0054] The conveying mechanism 3 in the pyrolysis chamber 1 performs reciprocating motion during operation, and can adjust the position of the wind turbine blade segments so that they fully stay within the action area of ​​the pyrolysis auxiliary component, ensuring that the pyrolysis auxiliary component can fully act on the wind turbine blade segments.

[0055] Preferably, the pyrolysis auxiliary component includes a first driving member 4, an operating arm 5, a brush holder 6, bristles 7, an air pump 8 and an air path control component 9, one end of the operating arm 5 is connected to the first driving member 4, the first driving member 4 is arranged along the width direction of the conveying mechanism 3, the first driving member 4 is used to drive the operating arm 5 to move, the operating arm 5 is fixedly connected to the brush holder 6 at one end away from the first driving member 4, the operating arm 5 and the brush holder 6 are connected by a telescopic driving rod 14, the brush holder 6 is a double-layer structure, the double-layer structures are connected by an elastic member 15, the double-layer structure is provided with a plurality of holes 16 for air flow to pass through, a plurality of bristles 7 are fixedly connected to the bottom of the brush holder 6, the bristles 7 are made of heat-resistant material, the heat-resistant material is glass fine fiber, the air pump 8 is located at the top of the pyrolysis chamber 1, the air pump 8 is used to introduce hot air flow and control the output air flow intensity, the top of the brush holder 6 is connected to the air path control component 9, the air path control component 9 is connected to the air pump 8 through an air pipe, and the air path control component 9 is used to blow the input air flow out between the bristles 7.

[0056] Since the wind turbine blade blocks are large in size and uneven in thickness, they are prone to uneven heating, and some areas that are poorly heated will undergo relatively slow pyrolysis. The operating arm 5 will continuously reciprocate during the pyrolysis process, driving the bristles 7 on the brush holder 6 to remove impurities such as tar and carbon deposits generated during the pyrolysis process from the surface of the wind turbine blades, preventing the formation of a dense carbon layer on the surface that hinders heat transfer, so that the inside of the wind turbine blade blocks can be fully in contact with the hot air flow, thereby improving the pyrolysis efficiency. The wind turbine blades are glass fiber reinforced resin-based composite materials. During the pyrolysis process, the organic resin filled between the glass fibers undergoes thermal decomposition, and the glass fibers are gradually exposed and present a porous structure. The hot air flow injected by the air pump 8 can better enter the pores between the glass fibers, thereby heating the inner layer of the wind turbine blades, while removing impurities such as tar and carbon deposits in the pores, enhancing heat transfer while cooperating with the bristles 7 to remove impurities. Through the detection of the infrared thermal imager 10, the low-temperature area of ​​the wind turbine blade can be located. When the operating arm 5 moves to the low-temperature area, the wind pump 8 can accelerate the heat exchange in the low-temperature area by increasing the hot air flow, so that the wind turbine blade blocks are heated evenly, the pyrolysis efficiency is improved, and the internal stress of the recycled glass fiber caused by uneven heating is alleviated. The bristles 7 will adhere to a large amount of carbon particles in the process of removing impurities. The hot air flow blown by the wind pump 8 can promote the falling of carbon particles, thereby cleaning the bristles 7. Since the pyrolysis process removes most of the carbon-containing impurities attached to the surface of the glass fiber, the time of the oxidation process can be greatly shortened, the energy consumption of the oxidation process can be reduced, and the mechanical properties of the recycled glass fiber can be improved.

[0057] Preferably, the infrared thermal imager 10 is disposed on the top wall of the pyrolysis chamber 1 , and the infrared thermal imager 10 is used to obtain infrared thermal images of the wind turbine blade cut pieces on the conveying mechanism 3 .

[0058] The infrared thermal imager 10 can well capture the outline of the wind turbine blade cut and reflect the temperature distribution of each area.

[0059] Preferably, the controller is used to increase the wind force of the wind pump 8 based on the infrared thermal image of the wind turbine blade segment when the operating arm 5 passes through the low temperature area of ​​the wind turbine blade segment. The controller obtains the contour of the wind turbine blade segment through grayscale image edge detection, and controls the first driving member 4 and the telescopic driving rod 14 based on the contour of the wind turbine blade segment so that the wind frame is always maintained at a fixed distance above the wind turbine blade segment. Maintaining a fixed distance can better stabilize the additional heat rate and facilitate temperature control.

[0060] The low-temperature area can be located by infrared thermal imaging, so that when the brush holder 6 passes through the low-temperature area, the wind force is increased to provide more heat for the low-temperature area, increase the temperature of the low-temperature area, and thus improve the pyrolysis efficiency.

[0061] Preferably, the baffle 11 is located on both sides of the conveying mechanism 3 , the baffle 11 is fixedly connected to the inner wall of the pyrolysis chamber 1 , a plurality of guide slots 12 are opened on the baffle 11 , a carbon hopper 13 is fixedly connected to the bottom of the baffle 11 , and the guide slots 12 are connected to the carbon hopper 13 .

[0062] The baffle 11 can limit the position of the wind turbine blade cut piece so that it will not be excessively displaced under the friction of the bristles 7. The guide slot 12 can guide out the brushed impurities such as tar and carbon deposits to reduce their accumulation on the conveying mechanism 3. The carbon bucket 13 is used to collect the guided impurities such as tar and carbon deposits to facilitate the subsequent maintenance of the pyrolysis chamber 1.

[0063] Preferably, the valve 25 is one of a relief valve, a pressure reducing valve and a sequence valve.

[0064] In addition to conventional switches, the overflow valve, the pressure reducing valve and the sequence valve can provide certain additional controls, thereby improving the control capability of the volatile matter entering the combustion chamber 2 and facilitating the control of the temperature of the refined pyrolysis chamber 1.

[0065] Preferably, the conveying mechanism 3 is a combination of one or more of a scale-type chain grate, a beam-type chain grate and a chain-belt chain grate.

[0066] The structures such as the scale chain grate, the beam chain grate and the belt chain grate have good high temperature adaptability and can operate well in the pyrolysis environment. The first driving member 4 also adopts the transmission structure of the chain grate structure to improve its high temperature adaptability.

[0067] Preferably, the conveying mechanism 3 also includes a flipping mechanism, which is used to flip the wind turbine blade blocks. The flipping mechanism consists of a second driving member 17 and a flap 18. The output shaft of the second driving member 17 is fixedly connected to the flap 18, and the flap 18 is in contact with the conveying mechanism 3.

[0068] The flap 18 in the flip mechanism can be flipped under the drive of the second driving member 17 to turn over the wind turbine blade blocks, thereby improving the pyrolysis efficiency. The second driving member 17 is a motor, whose electric control part is placed outside the pyrolysis chamber 1 and is equipped with a corresponding heat insulation or cooling structure, and the output shaft extends into the pyrolysis chamber 1 for driving the flap 18.

[0069] Preferably, the number of the pyrolysis auxiliary components is at least 2, and the pyrolysis auxiliary components are arranged on both sides of the flipping mechanism along the conveying mechanism 3, respectively, to process the wind turbine blade cut pieces before and after flipping, so that they can perform pyrolysis auxiliary functions throughout the process.

[0070] Embodiment 2:

[0071] A method for recovering long glass fibers by pyrolysis of wind turbine blade cut pieces comprises the following steps:

[0072] S1, loading wind turbine blade blocks through the loading port by manual loading, and the blocks are sent to the pyrolysis chamber 1 through the conveying mechanism 3 after being preheated in the preheating chamber 19;

[0073] S2, at the initial start-up, combustible gas is transported to the combustion chamber 2, and the high-temperature flue gas generated by the combustion exchanges heat with carbon dioxide through the second heat exchanger 23. The carbon dioxide is heated to a high temperature of 600-700°C and then transported to the pyrolysis chamber 1 through the wind chamber 24 and the valve 25. When the flue gas is discharged through the flue, it heats the cold air in the air preheater 26, and the generated hot air enters the oxidation chamber 20;

[0074] S3, adding wind turbine blade blocks at a feeding rate of 6-10 blocks / h through the feeding port, and controlling the transmission rate of the conveying mechanism 3 so that the residence time of the wind turbine blades in the preheating chamber 19 is 0.5-1h, and the residence time in the pyrolysis chamber 1 is 1-2h. During the pyrolysis process, the conveying mechanism 3 reciprocates, and the upper and lower surfaces of the wind turbine blade blocks are brought into contact with the pyrolysis auxiliary components through the flipping mechanism to remove impurities such as carbon deposits and tar on the surface. The volatile matter generated by the pyrolysis enters the combustion chamber 2 for combustion. After the temperatures of the preheating chamber 19, the pyrolysis chamber 1 and the oxidation chamber 20 are stabilized, the supply of combustible gas to the combustion chamber 2 is stopped;

[0075] S4, open the sealed furnace door at the discharge end of the pyrolysis chamber 1, and the conveying mechanism 3 delivers the long glass fibers obtained after pyrolysis into the oxidation chamber 20. After staying for 0.5-1h, the regenerated glass fibers after oxidation and carbon removal purification are discharged through the discharge port. The flue gas generated during the oxidation process heats the low-temperature carbon dioxide to a medium temperature of 200-300°C through the first heat exchanger 22.

[0076] S5, medium-temperature carbon dioxide is sent into the preheating chamber 19 through the wind chamber 24 to preheat the loaded wind turbine blade blocks.

[0077] The wind turbine blade cut pieces are fed through the feeding port at a feeding rate of 6-10 pieces / h, and continuous operation is performed, so that each wind turbine blade cut piece can be fully preheated, pyrolyzed and oxidized.

[0078] Carbon dioxide heated to 600-700°C can provide a suitable pyrolysis environment, and the wind chamber 24 and the valve 25 can provide high-temperature hot air flow from the upper and lower sides respectively.

[0079] The oxidation chamber 20 can further remove carbon-containing impurities on the surface of the recycled glass fiber, and can use the flue gas generated by oxidation to heat the preheating chamber 19 to improve the utilization rate of thermal energy.

[0080] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A system for pyrolyzing and recovering long glass fibers from wind turbine blade cut pieces, characterized in that: It includes a preheating chamber, a pyrolysis chamber, an oxidation chamber, a combustion chamber and a conveying mechanism, wherein: The preheating chamber is used to load and preheat the wind turbine blade blocks. A loading port is provided at the feeding end of the preheating chamber, and the discharging end of the preheating chamber is connected to the pyrolysis chamber. The pyrolysis chamber is used to provide a pyrolysis environment for the wind turbine blade cut pieces. The pyrolysis chamber is provided with a pyrolysis auxiliary component, an infrared thermal imager, a controller and a baffle. The pyrolysis auxiliary component is used to make the wind turbine blade cut pieces heat evenly and reduce the carbon deposits and tar adhesion on the surface of the recycled glass fiber. A gas outlet is provided at the top center of the pyrolysis chamber. The gas outlet is connected to the combustion chamber. The opening / closing of the gas outlet is controlled by a valve. The discharge end of the pyrolysis chamber is connected to the oxidation chamber. The discharge end of the pyrolysis chamber and the discharge end of the preheating chamber are respectively provided with sealed furnace doors. The preheating chamber and the pyrolysis chamber are connected / isolated by opening / closing the sealed furnace door at the discharge end of the preheating chamber. The pyrolysis chamber and the oxidation chamber are connected / isolated by opening / closing the furnace door at the discharge end of the pyrolysis chamber. The oxidation chamber is used to remove carbon from the long glass fibers obtained by pyrolysis. A first heat exchanger is arranged on the top of the oxidation chamber. The first heat exchanger is used to heat the low-temperature carbon dioxide into medium-temperature carbon dioxide. The medium-temperature carbon dioxide is injected into the preheating chamber to provide a preheating environment. The combustion chamber is used to provide the heat source required by the pyrolysis chamber. The side wall of the combustion chamber is arranged with a burner and an air inlet. The top of the combustion chamber is arranged with a second heat exchanger. The medium-temperature carbon dioxide is also used to enter the second heat exchanger to continue to heat up to high-temperature carbon dioxide. An air preheater is arranged in the flue of the combustion chamber. The cold air enters the oxidation chamber after being heated by the air preheater. The conveying mechanism is used to convey the cut wind turbine blades. A wind chamber is arranged at the bottom of the conveying mechanism. The conveying mechanism passes through the preheating chamber, the pyrolysis chamber and the oxidation chamber. The conveying mechanism located in the pyrolysis chamber performs reciprocating motion during operation.

2. The system for pyrolyzing and recovering long glass fibers from wind turbine blade cut pieces according to claim 1 is characterized in that: The pyrolysis auxiliary component includes a first driving member, an operating arm, a brush holder, bristles, an air pump and an air path control component. One end of the operating arm is connected to the first driving member, and the first driving member is arranged along the width direction of the conveying mechanism. The first driving member is used to drive the operating arm to move. The operating arm is fixedly connected to the brush holder at one end away from the first driving member. The operating arm and the brush holder are connected by a telescopic driving rod. The brush holder is a double-layer structure, and the double-layer structures are connected by elastic members. The double-layer structures are provided with a plurality of holes for air flow to pass through. A plurality of bristles are fixedly connected to the bottom of the brush holder, and the bristles are made of heat-resistant material. The air pump is located at the top of the pyrolysis chamber, and the air pump is used to introduce hot air flow and control the output air flow intensity. The top of the brush holder is connected to the air path control component, and the air path control component is connected to the air pump through an air pipe. The air path control component is used to blow the input air flow out between the bristles.

3. The system for pyrolyzing and recovering long glass fibers from wind turbine blade cut pieces according to claim 2 is characterized in that: The infrared thermal imager is arranged on the top wall of the pyrolysis chamber, and is used to obtain the outline and infrared thermal image of the wind turbine blade blocks on the conveying mechanism.

4. The system for pyrolyzing and recovering long glass fibers from wind turbine blade cut pieces according to claim 3 is characterized in that: The controller is used to increase the wind force of the wind pump when the operating arm passes through the low temperature area of ​​the wind turbine blade segment based on the infrared thermal image of the wind turbine blade segment. The controller obtains the contour of the wind turbine blade segment through grayscale image edge detection, and controls the first driving member and the telescopic driving rod based on the contour of the wind turbine blade segment to keep the wind frame at a fixed distance above the wind turbine blade segment at all times.

5. The system for pyrolyzing and recovering long glass fibers from wind turbine blade cut pieces according to claim 4 is characterized in that: The baffles are located on both sides of the conveying mechanism, are fixedly connected to the inner wall of the pyrolysis chamber, are provided with a plurality of guide slots, and a carbon bucket is fixedly connected to the bottom of the baffles, and the guide slots are communicated with the carbon bucket.

6. The system for pyrolyzing and recovering long glass fibers from wind turbine blade cut pieces according to claim 5 is characterized in that: The valve is one of a relief valve, a pressure reducing valve and a sequence valve.

7. The system for recovering long glass fibers by pyrolysis of cut wind turbine blades according to claim 6, characterized in that: The conveying mechanism is a combination of one or more of a scale-type chain grate, a beam-type chain grate and a chain-belt chain grate.

8. The system for recovering long glass fibers by pyrolysis of cut wind turbine blades according to claim 7, characterized in that: The conveying mechanism also includes a flipping mechanism, which is used to flip the wind turbine blade blocks. The flipping mechanism consists of a second driving member and a flap. The output shaft of the second driving member is fixedly connected to the flap, and the flap is fitted to the conveying mechanism.

9. The system for recovering long glass fibers by pyrolysis of cut wind turbine blades according to claim 8, characterized in that: The number of the pyrolysis auxiliary components is at least 2, and the pyrolysis auxiliary components are arranged on both sides of the turning mechanism along the conveying mechanism.

10. A method for recovering long glass fibers by pyrolysis of wind turbine blade cut pieces, based on the method of the system for recovering long glass fibers by pyrolysis of wind turbine blade cut pieces as claimed in claim 9, characterized in that: Includes steps: S1, loading wind turbine blade blocks through a loading port by manual loading, and the blocks are sent into the pyrolysis chamber through a conveying mechanism after being preheated in the preheating chamber; S2, at the initial start-up, the combustible gas is transported to the combustion chamber, and the high-temperature flue gas generated by the combustion is heat exchanged with the medium-temperature carbon dioxide through the second heat exchanger. The carbon dioxide is heated to a high temperature of 600-700℃ and then sent to the pyrolysis chamber through the wind chamber and valve. When the flue gas is discharged through the flue, it heats the cold air in the air preheater, and the generated hot air enters the oxidation chamber; S3, adding wind turbine blade blocks through the feeding port at a feeding rate of 6-10 blocks / h, and controlling the transmission rate of the conveying mechanism so that the wind turbine blades stay in the preheating chamber for 0.5-1h and stay in the pyrolysis chamber for 1-2h. During the pyrolysis process, the conveying mechanism reciprocates, and the upper and lower surfaces of the wind turbine blade blocks are brought into contact with the pyrolysis auxiliary components through the flipping mechanism to remove impurities such as carbon deposits and tar on the surface. The volatile matter generated by the pyrolysis enters the combustion chamber for combustion, and the supply of combustible gas to the combustion chamber is stopped after the temperatures of the preheating chamber, the pyrolysis chamber and the oxidation chamber are stabilized; S4, open the sealed furnace door at the discharge end of the pyrolysis chamber, and the conveying mechanism delivers the long glass fibers obtained after pyrolysis into the oxidation chamber. After staying for 0.5-1h, the regenerated glass fibers after oxidation and carbon removal are discharged through the discharge port. The flue gas generated during the oxidation process heats the low-temperature carbon dioxide to a medium temperature of 200-300°C through the first heat exchanger; S5, medium-temperature carbon dioxide is sent into the preheating chamber through the wind chamber to preheat the loaded wind turbine blade blocks.

Images