Separation equipment for waste wind turbine blade resin and fiber by grading and thermal decomposition

Abstract

This utility model proposes a graded thermal decomposition separation device for resin and fiber of waste wind turbine blades, belonging to the field of waste wind turbine blade recycling. In order to improve the thermal decomposition efficiency of waste wind turbine blades, the graded thermal decomposition separation device for resin and fiber of waste wind turbine blades includes a primary resin and fiber separation box (1), a screw conveyor (2), a secondary resin and fiber separation box (3), and a carbon removal box (4). The material to be decomposed can be initially pyrolyzed into semi-decomposed material in the primary resin and fiber separation box (1). The semi-decomposed material can enter the secondary resin and fiber separation box (3) through the screw conveyor (2). The semi-decomposed material can be pyrolyzed again in the secondary resin and fiber separation box (3) into carbon fiber material on the surface. The carbon particles on the carbon fiber material can be removed in the carbon removal box (4). By adopting two-stage or multi-stage thermal decomposition and providing different decomposition environments or decomposition conditions at different time periods, the thermal decomposition efficiency of waste wind turbine blades can be improved.

Description

Technical Field

[0001] This utility model relates to the field of waste wind turbine blade recycling, and in particular to a graded thermal decomposition and separation device for resin and fiber of waste wind turbine blades. Background Technology

[0002] With the accelerated upgrading and equipment replacement of new energy industries such as wind power and photovoltaics, new energy equipment will face the issue of mass retirement. The main material of wind turbine blades is resin-based composite material, a type of thermosetting composite material. It has advantages that other materials lack: lightweight, high strength, and corrosion resistance. However, once cured, it cannot be reused. Glass fiber, being cured within the fiber body, is extremely difficult to recycle, and even if recycled, it faces environmental and high cost challenges. Furthermore, retired wind turbine equipment is large in size and has high resource value. Therefore, the recycling of retired wind turbine equipment is of great significance. It can effectively utilize renewable resources such as resin, glass fiber, and carbon fiber, avoiding land occupation and environmental risks caused by improper utilization and disposal. It is the final link in the green, low-carbon, and circular development of the wind power industry chain.

[0003] Currently, the main technologies for thermal decomposition and recycling of waste wind turbine blades are rotary furnace heating decomposition and box-type fixed mode heating decomposition. These two methods can also separate the resin and fiber of waste wind turbine blades, but the resin on the blades is not completely separated, there is resin residue, and there are also problems such as slow decomposition speed, low production capacity, and easy secondary pollution when production is stopped. Utility Model Content

[0004] To improve the thermal decomposition efficiency of waste wind turbine blades, this utility model provides a graded thermal decomposition and separation device for resin and fiber of waste wind turbine blades. The waste wind turbine blade resin and fiber graded thermal decomposition and separation device adopts two-stage or multi-stage thermal decomposition, and provides different decomposition environments or decomposition conditions at different time periods, which can improve the thermal decomposition efficiency of waste wind turbine blades.

[0005] The technical solution adopted by this utility model embodiment to solve its technical problem is: A graded thermal decomposition and separation device for resin and fiber in waste wind turbine blades includes a primary resin and fiber separation box, a screw conveyor, a secondary resin and fiber separation box, and a carbon removal box arranged from left to right. The material to be decomposed can be initially pyrolyzed into semi-decomposed material in the primary resin and fiber separation box. The semi-decomposed material can enter the secondary resin and fiber separation box through the screw conveyor. The semi-decomposed material can be pyrolyzed again in the secondary resin and fiber separation box into carbon fiber-containing material on the surface. The carbon particles on the carbon fiber-containing material can be removed in the carbon removal box.

[0006] The heating temperature inside the primary resin fiber separation box is 400℃~600℃. The primary resin fiber separation box contains a primary separation box body and a primary separation inner cavity. The primary separation box body is provided with a primary inlet at the left end and a primary outlet at the right end. The primary separation inner cavity is provided with a primary conveying mechanism, which can convey the material to be decomposed from the primary inlet to the primary outlet.

[0007] The primary separation cavity is equipped with a material distribution spiral. The rotating shaft is located between the primary inlet and the primary conveying mechanism in the up-down direction. The material distribution spiral contains a rotating shaft and a first drive unit connected in sequence. The rotating shaft extends in the front-back direction and is connected to the front and rear spiral blades arranged in front and behind.

[0008] The primary inlet along the front-to-back direction is located between the front and rear spiral blades. During the process of the first drive unit driving the front and rear spiral blades to rotate around the axis, the distributing spiral can move the material to be decomposed to the front and rear sides. The distributing spiral is connected to a lifting mechanism, which can raise and lower the distributing spiral.

[0009] The heating temperature inside the secondary resin fiber separation box is 400℃~500℃. The secondary resin fiber separation box contains a secondary separation box body and a secondary separation inner cavity. A secondary inlet is provided at the left end of the secondary separation box body, and a secondary outlet is provided at the right end of the secondary separation box body. A secondary conveying mechanism is provided inside the secondary separation inner cavity, which can convey the semi-decomposed material from the secondary inlet to the secondary outlet.

[0010] The screw conveyor includes a screw housing and a screw cavity. The screw cavity contains an upper conveying screw and a lower conveying screw arranged in parallel. The upper and lower conveying screws are connected to a second drive unit. Both the upper and lower conveying screws are inclined from the lower left to the upper right. The screw conveyor can squeeze and tumble the semi-decomposed material to form the semi-decomposed material containing resin and the solid material without resin.

[0011] The spiral box is equipped with an insulation layer. The spiral box is equipped with a conveying inlet, an upper outlet, and a lower outlet. The conveying inlet is located above the lower left end of the upper conveying spiral and is connected to the primary outlet. The upper outlet is located to the right of the upper right end of the upper conveying spiral and is connected to the secondary inlet of the secondary resin fiber separation box. The semi-decomposed material containing resin can be discharged from the upper outlet. The lower outlet is located to the right of the upper right end of the lower conveying spiral and is connected to a solid waste storage box. The solid material without resin can be discharged from the lower outlet.

[0012] The upper conveying screw is longer than the lower conveying screw, and the pitch of the upper conveying screw blades is also greater than that of the lower conveying screw blades. The lower left and middle parts of the upper conveying screw overlap with the lower conveying screw at intervals, and the rotation direction of the upper conveying screw is the same as that of the lower conveying screw.

[0013] The carbon removal box contains an outer box and a carbon removal inner cavity. The carbon removal inlet is located at the left end of the outer box, and the fiber outlet is located at the lower right end of the outer box. The carbon removal inner cavity is equipped with a conveying screw and a heater. The conveying screw enables the carbon fiber material on the surface to move from the carbon removal inlet to the fiber outlet.

[0014] The carbon removal box also includes a control unit. The outer casing is equipped with an air inlet regulating port and a fan. Both the air inlet regulating port and the fan are connected to the control unit. The air inlet regulating port is located on the left side of the outer casing, and the fan is located on the right side of the outer casing. The control unit can control the opening degree of the air inlet regulating port and the power of the fan. External air can enter the carbon removal chamber through the air inlet regulating port, and the air in the carbon removal chamber can be discharged through the fan.

[0015] The beneficial effects of this utility model embodiment are: the waste wind turbine blade resin and fiber graded thermal decomposition separation equipment adopts two-stage or multi-stage thermal decomposition, and provides different decomposition environments or decomposition conditions at different time periods, which can improve the thermal decomposition efficiency of waste wind turbine blades. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention.

[0017] Figure 1 This is a front view schematic diagram of the waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment described in this utility model.

[0018] Figure 2 This is a schematic diagram of a primary resin fiber separation box.

[0019] Figure 3 It is along Figure 2 A schematic diagram of the direction A in the middle.

[0020] Figure 4 This is a schematic diagram of a screw conveyor.

[0021] Figure 5 This is a schematic diagram of a secondary resin fiber separation box.

[0022] Figure 6 This is a schematic diagram of a flue gas treatment device.

[0023] The annotations in the attached figures are explained as follows: 1. Primary resin fiber separation box; 2. Screw conveyor; 3. Secondary resin fiber separation box; 4. Carbon removal box; 5. Solid waste storage box; 6. Flue gas treatment device; 11. Primary separation chamber; 12. Primary separation inner cavity; 13. Primary inlet; 14. Primary outlet; 15. Distributing screw; 16. Lifting mechanism; 17. Primary conveying mechanism; 21. Spiral housing; 22. Spiral inner cavity; 23. Upper conveying spiral; 24. Lower conveying spiral; 25. Second drive unit; 31. Secondary separation chamber; 32. Secondary separation cavity; 33. Secondary inlet; 34. Secondary outlet; 35. Secondary conveying mechanism; 41. Outer casing; 42. Carbon removal chamber; 43. Carbon removal inlet; 44. Air volume regulating port; 45. Fiber outlet; 46. Conveying screw; 47. Heater; 48. Fan; 211. Conveyor Inlet; 212. Upper Outlet; 213. Lower Outlet; 151. Rotating shaft; 152. First drive unit; 153. Front helical blade; 154. Rear helical blade. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] For ease of understanding and description, the following description of this utility model uses absolute positional relationships. Unless otherwise specified, the directional word "above" indicates... Figure 1 The direction above, the directional word "down" indicates Figure 1 The lower side of the middle, the directional word "left" indicates Figure 1 The left side of the direction, the directional word "right" indicates Figure 1 The right-hand direction in the text, the directional word "front" indicates perpendicular to. Figure 1 The direction of the paper and the direction pointing inwards; the directional word "back" indicates perpendicular to. Figure 1 The direction of the orientation is towards the outside of the paper. This invention is described from the perspective of a reader or user, but the aforementioned directional terms should not be construed as limiting the scope of protection of this invention. Regarding the material, weight, size, angle, and parameters of the components, those skilled in the art can determine or replace them based on actual needs or a limited number of experiments.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown in the figure, the waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment described in this embodiment includes a primary resin fiber separation box 1, a screw conveyor 2, a secondary resin fiber separation box 3, and a carbon removal box 4 arranged sequentially from left to right. The material to be decomposed (large waste wind turbine blades after cutting, slicing, and shredding) can be initially pyrolyzed into semi-decomposed material in the primary resin fiber separation box 1. The semi-decomposed material can enter the secondary resin fiber separation box 3 through the screw conveyor 2. The semi-decomposed material can be pyrolyzed again in the secondary resin fiber separation box 3 into carbon fiber-containing material on the surface. The carbon particles on the carbon fiber-containing material can be removed in the carbon removal box 4.

[0027] The heating temperature inside the primary resin fiber separation box 1 is 400℃~600℃. The primary resin fiber separation box 1 includes a primary separation box body 11 and a primary separation inner cavity 12. A primary inlet 13 is provided at the left end of the primary separation box body 11, and a primary outlet 14 is provided at the right end of the primary separation box body 11. A primary conveying mechanism 17 and a primary heating device are provided inside the primary separation inner cavity 12. The primary conveying mechanism 17 can be a metal conveyor chain or a metal conveyor belt. The primary conveying mechanism 17 can convey the material to be decomposed from the primary inlet 13 to the primary outlet 14.

[0028] like Figure 2 , Figure 3 As shown, to ensure uniform material height within the primary resin fiber separation chamber 1, a distributing spiral 15 is installed within the primary separation cavity 12. A rotating shaft 151, extending vertically, is located between the primary inlet 13 and the primary conveying mechanism 17. The distributing spiral 15 includes a rotating shaft 151 and a first drive unit 152 connected sequentially. The rotating shaft 151 extends in the front-to-back direction and is externally connected to a front spiral blade 153 and a rear spiral blade 154, arranged front and rear respectively. The first drive unit 152 is located outside the primary separation cavity 12, while the rotating shaft 151, the front spiral blade 153, and the rear spiral blade 154 are located inside the primary separation cavity 12. The first drive unit 152 can drive the front spiral blade 153 and the rear spiral blade 154 to rotate around the rotating shaft 151.

[0029] The front helical blade 153 and the rear helical blade 154 are symmetrical and mirror images of each other. The primary inlet 13 is located between the front helical blade 153 and the rear helical blade 154 along the front-to-back direction. During the rotation of the front helical blade 153 and the rear helical blade 154 around the rotating shaft 151 driven by the first drive unit 152, the distributing screw 15 can move the material to be decomposed unloaded from the primary inlet 13 to the front and rear sides. The installation position of the distributing screw 15 determines the material height in the primary resin fiber separation box 1. The distributing screw 15 is connected to a lifting mechanism 16, which can raise and lower the distributing screw 15. When the distributing screw 15 rotates, the material enters from the primary inlet 13 and moves evenly to the front and rear sides, while also distributing the material evenly to the front and rear sides in terms of height, in order to ensure the height and uniformity of the material.

[0030] like Figure 1 , Figure 5 As shown, the heating temperature inside the secondary resin fiber separation box 3 is 400℃~500℃. The secondary resin fiber separation box 3 includes a secondary separation box body 31 and a secondary separation inner cavity 32. A secondary inlet 33 is provided at the left end of the secondary separation box body 31, and a secondary outlet 34 is provided at the right end of the secondary separation box body 31. A secondary conveying mechanism 35 is provided inside the secondary separation inner cavity 32. The secondary conveying mechanism 35 can be a metal conveyor chain or a metal conveyor belt. The secondary conveying mechanism 35 can convey the semi-decomposed material from the secondary inlet 33 to the secondary outlet 34.

[0031] like Figure 1 As shown, the waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment also includes a flue gas treatment device 6. The primary resin-fiber separation box 1 and the secondary resin-fiber separation box 3 are both connected to the flue gas treatment device 6. The material to be decomposed is initially pyrolyzed into semi-decomposed material in the primary resin-fiber separation box 1. The semi-decomposed material is then pyrolyzed again in the secondary resin-fiber separation box 3 to form a material containing carbon fibers on its surface; that is, the secondary resin-fiber separation box 3 performs a second residual resin pyrolysis separation. The flue gas mixture formed by the decomposition of resin on the wind turbine blades at high temperature is drawn by a wind turbine to the flue gas treatment device 6 for catalytic reforming and liquefaction to form pyrolysis oil. The exhaust gas is purified and discharged in compliance with standards. The flue gas treatment device 6 can adopt existing technology products.

[0032] like Figure 1 , Figure 4As shown, the screw conveyor 2 includes a screw housing 21 and a screw cavity 22. The screw cavity 22 contains an upper conveying screw 23 and a lower conveying screw 24 arranged parallel to each other. Multiple upper conveying screws 23 are arranged at intervals in the front-to-back direction, and multiple lower conveying screws 24 can also be arranged at intervals in the front-to-back direction. The upper conveying screws 23 and lower conveying screws 24 correspond one-to-one. The upper conveying screws 23 and lower conveying screws 24 are connected to a second drive unit 25. The second drive unit 25 can drive the upper conveying screws 23 and lower conveying screws 24 to rotate in opposite directions. The upper conveying screws 23 and lower conveying screws 24 rotate at the same speed. Both the upper conveying screws 23 and lower conveying screws 24 are inclined from the lower left to the upper right. The screw conveyor 2 can squeeze and tumble the semi-decomposed material to form the semi-decomposed material containing resin and the solid material without resin.

[0033] Specifically, wind turbine blades are mainly made of resin, glass fiber, and carbon fiber. Early blades also used balsa wood, which is a thermosetting plastic. During operation, large materials are typically shredded into pieces of about 20 cm (materials to be decomposed) using a shredder. The distance between the upper conveying screw 23 and the lower conveying screw 24 is only about 10 cm. After heating in the primary resin fiber separation box 1, the resin on the surface material has been initially separated, and other solids (such as balsa wood) have also been initially carbonized. During the conveying process of the upper conveying screw 23 and the lower conveying screw 24, the material is easily squeezed by the upper conveying screw 23 and falls into the lower conveying screw 24 through the long connecting opening of about 10 cm in the middle of the screw. In this way, the volume and weight of the material conveyed by the upper conveying screw 23 into the secondary resin fiber separation box 3 are reduced. Some of the solid waste after resin separation is conveyed to the solid waste storage box 5 through the lower conveying screw 24. In addition, glass fiber is also a thermal insulation material. When combined with resin, the speed at which heat penetrates into the interior will slow down. The upper conveying spiral 23 and the lower conveying spiral 24 can play a stirring role during the conveying process, which also accelerates the decomposition speed of the resin. In other words, the decomposition time of the material entering the secondary resin fiber separation box 3 will be reduced.

[0034] The semi-decomposed material discharged from the primary resin fiber separator 1 is conveyed into the screw conveyor 2, where it undergoes compression and tumbling. Through compression, some solids without resin are removed and fall into the lower conveying screw 24, while simultaneously being transported to the external solid waste storage box 5 for processing. Finally, it is packaged and stored, thus reducing the volume and weight of the waste wind turbine blades with residual resin. Furthermore, the tumbling action of the upper conveying screw 23 and the lower conveying screw 24 improves the efficiency of heat penetration into the solid waste, reducing the amount of solid waste that needs to enter the secondary resin fiber separator 3 for secondary residual resin pyrolysis separation. The secondary resin separation eliminates the heating time required to rise from room temperature to the required decomposition temperature; that is, the starting temperature is the decomposition temperature. The heating device in the secondary resin fiber separator 3 only needs to maintain the heat required for the decomposition of the remaining resin, thus reducing energy consumption.

[0035] like Figure 1 , Figure 4 As shown, the spiral box 21 is provided with an insulation layer. The spiral box 21 is provided with a conveying inlet 211, an upper outlet 212 and a lower outlet 213. The conveying inlet 211 is located above the lower left end of the upper conveying spiral 23 and is connected to the primary outlet 14. The upper outlet 212 is located to the right of the upper right end of the upper conveying spiral 23 and is connected to the secondary inlet 33 of the secondary resin fiber separation box 3. The semi-decomposed material containing resin can be discharged from the upper outlet 212 and enter the secondary resin fiber separation box 3. The lower outlet 213 is located to the right of the upper right end of the lower conveying spiral 24 and is connected to a solid waste storage box 5. The solid material without resin can be discharged from the lower outlet 213 and enter the solid waste storage box 5.

[0036] like Figure 2 , Figure 3 As shown, the outer diameter of the upper conveying screw 23 is larger than that of the lower conveying screw 24, and the pitch of the screw blades of the upper conveying screw 23 is also larger than that of the screw blades of the lower conveying screw 24. The lower left and middle parts of the upper conveying screw 23 overlap with the lower conveying screw 24 at intervals, and the rotation direction of the upper conveying screw 23 is the same as that of the lower conveying screw 24.

[0037] The carbon removal box 4 includes an outer box 41 and a carbon removal inner cavity 42. The outer box 41 is square and made of high-temperature resistant stainless steel. A carbon removal inlet 43 is provided at the left end of the outer box 41, and a fiber outlet 45 is provided at the lower right end of the outer box 41. A conveying spiral 46 and a heater 47 are provided in the carbon removal inner cavity 42. The conveying spiral 46 extends in the left-right direction, and the heater 47 is located at the bottom of the outer box 41. The conveying spiral 46 enables the carbon fiber material on the surface to move from the carbon removal inlet 43 to the fiber outlet 45.

[0038] like Figure 1 , Figure 6 As shown, the heating temperature inside the decarbonization chamber 42 is no more than 400℃. A conveyor belt can be installed between the secondary outlet 34 of the secondary resin fiber separation box 3 and the decarbonization inlet 43 of the decarbonization box 4. The carbon fiber material discharged from the secondary resin fiber separation box 3 can enter the decarbonization box 4 through the conveyor belt for removal.

[0039] The carbon removal box 4 also includes a control unit. An air inlet regulating port 44 and a fan 48 are provided on the outer casing 41. Both the air inlet regulating port 44 and the fan 48 are connected to the control unit. The air inlet regulating port 44 is located on the left side of the outer casing 41 and is connected to the carbon removal inlet 43. The fan 48 is located on the right side of the outer casing 41. The control unit can control the opening degree of the air inlet regulating port 44 and the power of the fan 48. Outside air can enter the carbon removal inner cavity 42 through the air inlet regulating port 44, and the air inside the carbon removal inner cavity 42 can be discharged through the fan 48. The air inlet regulating port 44 can be an electrically controlled switch valve with adjustable opening degree.

[0040] The solid material formed after pyrolysis in the secondary resin fiber separation box 3 (mainly fiber, which can be called carbon fiber surface material) has no residual resin, but retains a large number of carbon particles. It is conveyed to the decarbonization box 4 by a conveyor belt for decarbonization treatment. In the decarbonization box 4, the residual heat of the fiber itself and the supplementary heat provided by the heater 47 are used. The air volume regulating port 44 and the fan 48 work together to intelligently regulate the air volume entering the decarbonization box 4, so that the residual carbon on the fiber surface is quickly oxidized to form carbon dioxide gas. The conveying screw 46 is frequency-controlled to control the fiber conveying speed to match the time required for the oxidation of the residual carbon on the surface. At the same time, the oxidized gas is discharged through the fan 48, and finally the decarbonization treatment of the fiber is completed, providing the original color recycled fiber.

[0041] The working process of the waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment is described below.

[0042] 1. The material to be decomposed (large waste wind turbine blades after cutting, slicing and shredding) is initially pyrolyzed into semi-decomposed material in the primary resin fiber separation box 1.

[0043] 2. The semi-decomposed material enters the screw conveyor 2, where it is squeezed and turned to form the semi-decomposed material containing resin and the solid material without resin.

[0044] 3. The semi-decomposed material containing resin enters the secondary resin fiber separation box 3 for secondary pyrolysis into carbon fiber material on the surface, and the solid material without resin enters the solid waste storage box 5 for storage.

[0045] 4. The carbon particles on the surface of the carbon fiber material discharged from the secondary resin fiber separation box 3 are removed in the carbon removal box 4.

[0046] Conventional single-chamber fixed-mode thermochemical decomposition requires larger chambers or increased stacking height of blade waste inside the chamber to ensure sufficient output. For resin to decompose fully, the decomposition time needs to be extended. With continuous feeding, the resin is constantly separating, and flue gas mixtures are continuously generated. Some flue gas stays around the chamber for too long, failing to undergo timely catalytic reforming, leading to an increase in non-condensable gases, reduced pyrolysis oil recovery, increased emissions, a heavier burden on exhaust gas purification, and decreased economic efficiency.

[0047] In conventional single-chamber fixed-mode heating decomposition, the minimum decomposition time of resin is fixed. If the material is too high, similar to an insulation layer, heat cannot penetrate within the fixed time, and the resin cannot be completely decomposed and discharged directly, resulting in unqualified by-products that cannot be recycled.

[0048] The waste wind turbine blade resin and fiber grading and pyrolysis separation equipment of this utility model only requires a fixed minimum decomposition time during use. The gas residence time is matched with the catalytic reforming time by the fan traction, reducing the generation of non-condensable gases and the amount of exhaust gas treated. Pyrolysis oil is recovered to the maximum extent. With the total processing volume and total heating power remaining unchanged, the material height in the primary resin and fiber separation tank 1 and the secondary resin and fiber separation tank 3 is lower, which is conducive to rapid heat penetration and decomposition. Therefore, within the same time and with the same total heating power, the waste processing capacity is increased.

[0049] The following describes the actual use of the waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment.

[0050] The following experiments were conducted on the same batch of discarded wind turbine blades: Experiment 1: Using a conventional single-chamber fixed mode, resin and fiber were heated and decomposed to separate them.

[0051] Experiment 2 involved using the waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment described above to decompose and separate the resin and fiber.

[0052] Analysis of Experiments 1 and 2 yielded the following conclusions: For the same batch of solid waste, with the same volume or weight and the same heating power, the staged thermal decomposition separation of resin and fiber using this invention shortened the time by 16 minutes, increased pyrolysis oil recovery by 2%, and ensured thorough and clean separation of resin and fiber. This improved solid waste treatment efficiency while also saving energy and reducing consumption.

[0053] After pyrolysis in the secondary resin fiber separation box 3, the solid material (mainly fibers) has no residual resin, but retains a large number of carbon particles. It is conveyed to the decarbonization box 4 by a conveyor belt for decarbonization treatment. The air volume regulating port 44 and the fan 48 work together to intelligently regulate the air volume entering the decarbonization box 4, so that the residual carbon on the fiber surface is quickly oxidized. At the same time, the oxidized gas is discharged through the fan 48, and finally the decarbonization treatment of the fiber is completed, providing the original color recycled fiber.

[0054] The above description is merely a specific embodiment of this utility model and should not be construed as limiting the scope of its implementation. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this utility model should still fall within its coverage. Furthermore, the technical features, technical solutions, and embodiments of this utility model can be freely combined and used.

Claims

1. A graded thermal decomposition and separation device for resin and fiber from waste wind turbine blades, characterized in that, The waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment includes a primary resin fiber separation box (1), a screw conveyor (2), a secondary resin fiber separation box (3), and a carbon removal box (4) arranged from left to right. The material to be decomposed can be initially pyrolyzed into semi-decomposed material in the primary resin fiber separation box (1). The semi-decomposed material can enter the secondary resin fiber separation box (3) through the screw conveyor (2). The semi-decomposed material can be pyrolyzed again in the secondary resin fiber separation box (3) into carbon fiber material on the surface. The carbon particles on the carbon fiber material on the surface can be removed in the carbon removal box (4).

2. The waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment according to claim 1, characterized in that, The heating temperature inside the primary resin fiber separation box (1) is 400℃~600℃. The primary resin fiber separation box (1) contains a primary separation box body (11) and a primary separation inner cavity (12). A primary inlet (13) is provided at the left end of the primary separation box body (11), and a primary outlet (14) is provided at the right end of the primary separation box body (11). A primary conveying mechanism (17) is provided inside the primary separation inner cavity (12). The primary conveying mechanism (17) can convey the material to be decomposed from the primary inlet (13) to the primary outlet (14).

3. The waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment according to claim 2, characterized in that, A material distribution spiral (15) is provided in the primary separation cavity (12). The rotating shaft (151) along the up and down direction is located between the primary inlet (13) and the primary conveying mechanism (17). The material distribution spiral (15) contains a rotating shaft (151) and a first drive unit (152) connected in sequence. The rotating shaft (151) extends in the front and back direction. The rotating shaft (151) is connected to the front spiral blade (153) and the rear spiral blade (154) arranged in front and back.

4. The waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment according to claim 3, characterized in that, The primary inlet (13) along the front-to-back direction is located between the front helical blade (153) and the rear helical blade (154). During the process of the first drive unit (152) driving the front helical blade (153) and the rear helical blade (154) to rotate around the rotating shaft (151), the distributing screw (15) can move the material to be decomposed to the front and back sides. The distributing screw (15) is connected to a lifting mechanism (16), which can lift the distributing screw (15).

5. The waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment according to claim 2, characterized in that, The heating temperature inside the secondary resin fiber separation box (3) is 400℃~500℃. The secondary resin fiber separation box (3) contains a secondary separation box body (31) and a secondary separation inner cavity (32). A secondary inlet (33) is provided at the left end of the secondary separation box body (31), and a secondary outlet (34) is provided at the right end of the secondary separation box body (31). A secondary conveying mechanism (35) is provided inside the secondary separation inner cavity (32). The secondary conveying mechanism (35) can convey the semi-decomposed material from the secondary inlet (33) to the secondary outlet (34).

6. The waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment according to claim 5, characterized in that, The screw conveyor (2) contains a screw housing (21) and a screw cavity (22). The screw cavity (22) contains an upper conveying screw (23) and a lower conveying screw (24) arranged in parallel. The upper conveying screw (23) and the lower conveying screw (24) are connected to a second drive unit (25). The upper conveying screw (23) and the lower conveying screw (24) are both inclined in the direction from the lower left to the upper right. The screw conveyor (2) can squeeze and turn the semi-decomposed material to form the semi-decomposed material containing resin and the solid material without resin.

7. The waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment according to claim 6, characterized in that, The spiral box (21) is provided with an insulation layer. The spiral box (21) is provided with a conveying inlet (211), an upper outlet (212) and a lower outlet (213). The conveying inlet (211) is located above the lower left end of the upper conveying spiral (23). The conveying inlet (211) is connected to the primary outlet (14). The upper outlet (212) is located to the right of the upper right end of the upper conveying spiral (23). The upper outlet (212) is connected to the secondary inlet (33) of the secondary resin fiber separation box (3). The semi-decomposed material containing resin can be discharged from the upper outlet (212). The lower outlet (213) is located to the right of the upper right end of the lower conveying spiral (24). The lower outlet (213) is connected to a solid waste storage box (5). The solid material without resin can be discharged from the lower outlet (213).

8. The waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment according to claim 7, characterized in that, The length of the upper conveying screw (23) is greater than the length of the lower conveying screw (24). The pitch of the screw blades of the upper conveying screw (23) is also greater than the pitch of the screw blades of the lower conveying screw (24). The lower left and middle parts of the upper conveying screw (23) overlap with the lower conveying screw (24) at intervals. The rotation direction of the upper conveying screw (23) is the same as the rotation direction of the lower conveying screw (24).

9. The waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment according to claim 1, characterized in that, The carbon removal box (4) contains an outer box (41) and a carbon removal inner cavity (42). The left end of the outer box (41) is provided with a carbon removal inlet (43), and the lower right end of the outer box (41) is provided with a fiber outlet (45). The carbon removal inner cavity (42) is provided with a conveying screw (46) and a heater (47). The conveying screw (46) can make the carbon fiber material on the surface move from the carbon removal inlet (43) to the fiber outlet (45).

10. The waste wind turbine blade resin and fiber grading and thermal decomposition separation equipment according to claim 1, characterized in that, The carbon removal box (4) also contains a control unit. An air inlet regulating port (44) and a fan (48) are provided on the outer casing (41). The air inlet regulating port (44) and the fan (48) are both connected to the control unit. The air inlet regulating port (44) is located on the left side of the outer casing (41), and the fan (48) is located on the right side of the outer casing (41). The control unit can control the opening degree of the air inlet regulating port (44) and the power of the fan (48). External air can enter the carbon removal chamber (42) from the air inlet regulating port (44), and the air in the carbon removal chamber (42) can be discharged from the fan (48).

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