Retired wind power blade product-mixed fiber sorting system

Abstract

The invention discloses a decommissioned wind power blade product-mixed fiber sorting system, which comprises a pretreatment system, a primary sorting system and a secondary sorting system, and is characterized in that a vibrating screen of the pretreatment system is used for removing residual dust and carbon deposition impurities on a decommissioned wind power blade product so as to realize primary cleaning; a calcium chloride solution with the saturated solution density of 1.81 t / m < 3 > to 1.83 t / m < 3 > at the temperature of 60 DEG C to 70 DEG C is contained in a salt water tank of the primary sorting system, so that the density of the calcium chloride solution is kept between the carbon fiber density and the glass fiber density, and therefore, after the pretreated retired wind power blade product is put into the salt water tank, the calcium chloride solution is separated from the glass fiber; the carbon fibers and the glass fibers can float or sink in a flotation manner, so that a primary separation function is realized; according to the characteristic that the carbon fibers and the glass fibers are different in color, the secondary sorting system separates a small amount of residual carbon fibers in the glass fibers or separates a small amount of residual glass fibers in the carbon fibers by arranging a color sorter, so that the advantage of improving the purity of the fibers is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste treatment and resource recycling, and in particular to a retired wind turbine blade product-mixed fiber sorting system. Background Art

[0002] In order to achieve the "dual carbon" goal, my country has vigorously developed wind power generation. The low installed capacity and high operation and maintenance costs of early wind turbines, as well as the low effective utilization rate of wind farms, have accelerated the technical transformation and upgrading of wind turbines, thereby further shortening the service life of wind turbine blades. Therefore, it is urgent to develop technologies for processing retired wind turbine blades. As the installed capacity of wind turbines increases, the strength and stiffness of wind turbine blade materials must also be continuously improved.

[0003] It is known that carbon fiber materials have the advantages of low density and high strength. Using them to replace glass fiber in wind turbine blades is a future development trend. In order to save costs, domestic carbon fiber wind turbine blades mainly use carbon fiber for the main beam, and other parts still use glass fiber; and with the application of carbon fiber wind turbine blades in my country and the substantial increase in the installed capacity of wind turbines, the large-scale retirement of wind turbine blades in the future will generate a large amount of recycled fiber. The mixed limit obtained after the disposal of retired wind blades needs to be separated in a certain way. If manual sorting is used, the efficiency will be low and it will be difficult to achieve industrialization of 10,000 tons or 100,000 tons in the future. In addition, carbon fiber (1.5~1.8t / m 3 ) and glass fiber (2.5~2.7t / m 3 ) have a small difference in density, and it is difficult to separate the two fibers by air separation.

[0004] Therefore, in order to achieve the classification of mixed fibers and improve the recycling value of retired carbon fiber wind turbine blades, this patent proposes a mixed fiber sorting system for retired wind turbine blade products, aiming to achieve effective separation of glass fiber and carbon fiber. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide a retired wind turbine blade product-mixed fiber sorting system to effectively separate glass fibers and carbon fibers in retired wind turbine blade products.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A retired wind turbine blade product-mixed fiber sorting system, comprising:

[0008] A pretreatment system, the pretreatment system comprising a screw conveyor and a vibrating screen, the end of the screw conveyor faces the inlet of the vibrating screen, and the vibrating screen removes carbon deposits and dust from the product by vibration;

[0009] The primary sorting system comprises a salt water pool, the outlet of the vibrating screen faces the salt water pool, and the salt water pool is used to contain a saturated solution with a density of 1.81 t / m at 60°C-70°C. 3 -1.83t / m 3 calcium chloride solution, flotation product through the calcium chloride solution in the brine pool;

[0010] A secondary sorting system, the secondary sorting system comprises a color sorter, the color sorter is arranged on one side of the brine pool, and the color sorter is used to sort the products after flotation by color sorting.

[0011] Furthermore, it also includes a cleaning system arranged between the primary sorting system and the secondary sorting system, the cleaning system includes a dewatering machine and a brush roller, the inlet of the dewatering machine is used to put the product after flotation, the dewatering machine is used to dewater the product after flotation, the outlet of the dewatering machine is opposite to the inlet of the brush roller, and the brush roller is used to rub and clean the surface of the dewatered product.

[0012] Furthermore, the cleaning system also includes a cleaning and dehydrating machine and a dryer. The outlet of the brush roller is opposite to the inlet of the cleaning and dehydrating machine. The cleaning and dehydrating machine cleans and dehydrates the products that have been friction-cleaned. The dryer is arranged on one side of the cleaning and dehydrating machine, and dries the products that have been cleaned and dehydrated.

[0013] Furthermore, it also includes two conveyors, which are distributed above and below the salt water pool, and the ends of the two conveyors extend to the entrances of the two dehydrators respectively.

[0014] Furthermore, the conveyor adopts a conveyor belt mechanism, a feeding pump mechanism or a scraper feeding mechanism.

[0015] Furthermore, a reflux channel is provided on the inner wall of the top of the salt water pool, and a sedimentation tank is provided on the inner bottom surface of the salt water pool. The reflux channel recovers the upper clear liquid of the salt water pool, and the sedimentation tank collects the sediment at the bottom of the salt water pool.

[0016] Furthermore, a density meter, a thermometer and an electric heating device are provided in the salt water pool. The density meter is used to measure the density of the calcium chloride solution in the salt water pool, the thermometer is used to measure the temperature of the calcium chloride solution in the salt water pool, and the electric heating device is used to adjust the temperature of the calcium chloride solution in the salt water pool.

[0017] Furthermore, it also includes a baler, which is arranged on one side of the color sorter and is used to pack the color-sorted products.

[0018] The present invention has the following beneficial effects:

[0019] The retired wind turbine blade product-mixed fiber sorting system of the present invention is provided with a pretreatment system, a primary sorting system and a secondary sorting system. The vibrating screen of the pretreatment system is used to remove the dust and carbon deposit impurities remaining on the retired wind turbine blade products to achieve a preliminary cleaning effect. The brine pool of the primary sorting system is filled with a saturated solution density of 1.81t / m at 60℃-70℃. 3 -1.83t / m 3 of calcium chloride solution to keep the density of the calcium chloride solution between the density of carbon fiber and the density of glass fiber. Therefore, after the pretreated retired wind turbine blade products are placed in the brine pool, the carbon fiber and glass fiber can float or sink by flotation, thereby realizing the function of preliminary separation; the secondary sorting system, according to the different colors of carbon fiber and glass fiber, separates the small amount of carbon fiber remaining in the glass fiber, or separates the small amount of glass fiber remaining in the carbon fiber by setting a color sorter, thereby achieving the advantage of improving fiber purity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the retired wind turbine blade product-mixed fiber sorting system of the present invention.

[0021] In the figure: 1. Screw conveyor; 2. Vibrating screen; 3. Brine pool; 4. Dehydrator; 5. Brush roller; 6. Cleaning and dehydrating machine; 7. Dryer; 8. Color sorter. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The terms such as "upper", "inner", "middle", "left", "right" and "one" cited in this specification are only for the convenience of description, and are not used to limit the scope of the present invention. The change or adjustment of their relative relationship shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0023] The present invention aims at the demand of recycling and processing retired wind turbine blades, and provides a processing system, which can separate the mixed fibers (mainly carbon fibers and glass fibers) recycled from retired wind turbine blades, and obtain clean carbon fibers and glass fibers after processing by the system device. The present invention uses a combination of calcium chloride salt solution and color sorting to process the mixed fibers according to the characteristics of the mixed fibers. This method has low operating costs and can be applied to industrial production on a large scale.

[0024] The processing system of the present invention is described in detail below:

[0025] Retired wind turbine blades refer to wind turbine blades made of mixed fiber cloth of carbon fiber and glass fiber. Carbon fiber has the advantages of high strength, high modulus, light density, etc. Large diameter wind turbine blades can be partially replaced by carbon fiber. Therefore, in the future, the use of pyrolysis oxidation to recycle fibers will require the separation of mixed fibers. This system is designed to achieve the purpose of separating carbon fiber and glass fiber.

[0026] A system for sorting mixed fibers from retired wind turbine blade products, such as Figure 1 As shown, it includes a pretreatment system, a primary sorting system, a cleaning system, a secondary sorting system and a baler; the pretreatment system is used for preliminarily treating the carbon deposits and dust on the surface of retired wind turbine blade products; the primary sorting system is used for sorting retired wind turbine blade products by flotation to separate the carbon fiber and glass fiber of the retired wind turbine blade products; the cleaning system is used for cleaning the carbon fiber products and glass fiber products that have been sorted once; the secondary sorting system is used for further secondary sorting of the carbon fiber products and glass fiber products that have been sorted once by color sorting to pick out the glass fiber in the carbon fiber products that have been sorted once, or to pick out the glass fiber in the carbon fiber products, so as to improve the purity of the sorted carbon fiber and glass fiber; the baler is used for baling the carbon fiber products and glass fiber products that have been sorted twice.

[0027] Regarding the pretreatment system, the pretreatment system includes a screw conveyor 1 and a vibrating screen 2. The screw conveyor 1 can use a feeding pump or a conveyor belt mechanism, and the end of the screw conveyor 1 faces the entrance of the vibrating screen 2. After the retired wind turbine blade products enter the vibrating screen 2, since the surface of the retired wind turbine blade products is mixed with a small amount of impurities such as dust and carbon deposits, the vibrating screen 2 is used to vibrate the products to remove impurities such as dust and carbon deposits on the surface of the products, which is beneficial to improve the purity of subsequent products and avoid dust pollution. The primary sorting system and the secondary sorting system used afterwards, thereby reducing the number of equipment cleaning times.

[0028] Regarding the primary sorting system, the primary sorting system includes a salt water pool 3, and the outlet of the vibrating screen 2 faces the salt water pool 3. It is known that carbon fiber and glass fiber have density differences, and conventional sorting and skipping methods will have poor effects. Therefore, the present invention adopts the salt water pool 3 for flotation. Specifically, the salt water pool 3 is filled with a saturated solution density of 1.81t / m when the temperature is 60℃-70℃. 3 -1.83t / m 3 The calcium chloride solution is prepared so that the density of the calcium chloride solution is between the density of carbon fiber and the density of glass fiber. Therefore, after the retired wind turbine blade products are placed in the salt water pool 3 and allowed to stand, the products with higher density will sink, while the products with lower density will float, thereby realizing the function of flotation of retired wind turbine blade products.

[0029] Regarding the salt water pool 3, in order to ensure that the density of the calcium chloride solution is between the carbon fiber and the glass fiber, a density meter, a thermometer, an electric heating device and a liquid level meter are arranged in the salt water pool 3; the density meter is used to measure the density of the calcium chloride solution in the salt water pool 3 in real time; the thermometer is used to measure the temperature of the calcium chloride solution in the salt water pool 3 in real time; the electric heating device adopts the steam jacket or electric heating wire of the prior art to heat the salt solution in the salt water pool 3, so as to control the temperature of the salt solution in the salt water pool 3 at 60°C to 70°C, and the liquid level meter is used to measure the liquid level of the salt solution in the salt water pool 3 in real time to prevent the salt solution level from being too low. Therefore, the calcium chloride solution in the salt water pool 3 is used as a primary sorting to preliminarily separate the carbon fiber and the glass fiber, thereby improving the purity of the product fiber.

[0030] In this embodiment, a reflux channel is provided on the inner wall of the top of the salt water pool 3, and a sedimentation tank is provided on the inner bottom surface of the salt water pool 3. The reflux channel can reflux and recycle the upper clear liquid of the salt water pool 3 to reduce waste, and the sedimentation tank can be used to collect the sediment at the bottom of the salt water pool 3 to achieve the effect of recycling.

[0031] In this embodiment, in order to be able to transfer the products of the upper and lower layers of the salt water pool 3 to two independent cleaning systems respectively, thereby improving the kinetic energy of remote transportation. The present invention also includes a conveyor, and the conveyor can adopt a conveyor belt mechanism, a feeding pump mechanism or a scraper feeding mechanism to realize the function of remote feeding. In this embodiment, there are two conveyors, which are distributed above and below the salt water pool 3. The ends of the two conveyors extend to two relatively independent cleaning systems respectively, so as to improve the efficiency of further feeding outward after the first sorting, which is conducive to improving the sorting efficiency of the first sorting system.

[0032] The cleaning system is arranged after the primary sorting system, and is used for cleaning the carbon fiber and glass fiber products after the primary sorting; the cleaning system comprises a dewatering machine 4 and a brush roller 5, the dewatering machine 4 is a roller with a mesh drum, and the brush roller 5 is a roller with a brush on the inner wall; wherein, the inlet of the dewatering machine 4 is used for placing the products after flotation, and when the dewatering machine 4 is started, the centrifugal force generated can dewater the carbon fiber products or glass fiber products after flotation, and the outlet of the dewatering machine 4 is directly opposite to the inlet of the brush roller 5, and the brush roller 5 rubs and cleans the residual calcium chloride solution on the surface of the dehydrated product through the brush during the rolling process.

[0033] The cleaning system of the present invention also includes a cleaning and dehydrating machine 6 and a drying machine 7. The cleaning and dehydrating machine 6 adopts a cleaning mesh drum, and municipal tap water can be supplied to the inside for cleaning during the rotation of the mesh drum. The outlet of the brush drum 5 is directly opposite to the inlet of the cleaning and dehydrating machine 6. The cleaning and dehydrating machine 6 supplies water to the inside through municipal tap water (such as water supplied by a faucet water pipe). After cleaning, the mesh drum can be rotated to achieve the function of dehydrating, so as to realize the function of cleaning and dehydrating the carbon fiber product or glass fiber product after friction cleaning; the drying machine 7 is arranged on one side of the cleaning and dehydrating machine 6. After the carbon fiber product or glass fiber product is cleaned and dehydrated by the cleaning and dehydrating machine 6, the product can be transferred to the drying machine 7 by a feeder (such as a pumping pump or a feeding pump in the prior art), and the product after cleaning and dehydration is dried by the drying machine 7, so as to facilitate the next step of secondary sorting operation.

[0034] Regarding the secondary sorting system, the secondary sorting system includes a color sorter 8, which can realize the color sorting function through a color sensor, a light wave sensor or a light sensor. It is known that carbon fiber is black and glass fiber is white. Therefore, the main function of the color sorter 8 is to color-sort the doped white glass fiber products from the input carbon fiber products, or to color-sort the doped black carbon fiber products from the input glass fiber products, so as to improve the purity of the product.

[0035] In summary, the retired wind turbine blade product-mixed fiber sorting system of the present invention is provided with a pretreatment system, a primary sorting system and a secondary sorting system. The vibrating screen 2 of the pretreatment system is used to remove the dust and carbon deposit impurities remaining on the retired wind turbine blade products to achieve the effect of preliminary cleaning; the brine pool 3 of the primary sorting system is filled with a saturated solution density of 1.81t / m at 60℃-70℃. 3 -1.83t / m 3 The calcium chloride solution is added to keep the density of the calcium chloride solution between the density of the carbon fiber and the density of the glass fiber. Therefore, after the pretreated retired wind turbine blade products are placed in the salt water pool 3, the carbon fiber and the glass fiber can float up or sink by flotation, thereby realizing the function of preliminary separation. The secondary sorting system separates a small amount of carbon fiber remaining in the glass fiber or a small amount of glass fiber remaining in the carbon fiber by setting a color sorter 8 according to the different colors of the carbon fiber and the glass fiber, thereby realizing the advantage of improving the purity of the fiber.

[0036] The implementation methods of the present invention are not limited to this. According to the above content of the present invention, using common technical knowledge and customary means in the field, without departing from the above basic technical ideas of the present invention, the present invention can also make other various forms of modification, replacement or combination, all of which fall within the scope of protection of the present invention.

Claims

1. A retired wind turbine blade product-mixed fiber sorting system, characterized in that: include: A pretreatment system, the pretreatment system comprising a screw conveyor and a vibrating screen, the end of the screw conveyor faces the inlet of the vibrating screen, and the vibrating screen removes carbon deposits and dust from the product by vibration; The primary sorting system comprises a salt water pool, the outlet of the vibrating screen faces the salt water pool, and the salt water pool is used to contain a saturated solution with a density of 1.81 t / m at 60°C-70°C. 3 -1.83t / m 3 calcium chloride solution, flotation product through the calcium chloride solution in the brine pool; A secondary sorting system, the secondary sorting system comprises a color sorter, the color sorter is arranged on one side of the brine pool, and the color sorter is used to sort the products after flotation by color sorting.

2. The retired wind turbine blade product-mixed fiber sorting system according to claim 1, characterized in that: It also includes a cleaning system arranged between the primary sorting system and the secondary sorting system, the cleaning system includes a dewatering machine and a brush roller, the inlet of the dewatering machine is used to put the product after flotation, the dewatering machine is used to dewater the product after flotation, the outlet of the dewatering machine is opposite to the inlet of the brush roller, and the brush roller is used to rub and clean the surface of the dewatered product.

3. The retired wind turbine blade product-mixed fiber sorting system according to claim 2, characterized in that: The cleaning system also includes a washing and dehydrating machine and a drying machine. The outlet of the brush roller is directly opposite to the inlet of the washing and dehydrating machine. The washing and dehydrating machine washes and dehydrates the products that have been cleaned by friction. The drying machine is arranged on one side of the washing and dehydrating machine and dries the products that have been washed and dehydrated.

4. The retired wind turbine blade product-mixed fiber sorting system according to claim 2, characterized in that: It also includes two conveyors, which are distributed above and below the salt water pool, and the ends of the two conveyors extend to the entrances of the two dehydrators respectively.

5. The retired wind turbine blade product-mixed fiber sorting system according to claim 4, characterized in that: The conveyor adopts a conveyor belt mechanism, a feeding pump mechanism or a scraper feeding mechanism.

6. The retired wind turbine blade product-mixed fiber sorting system according to claim 1, characterized in that: The inner wall at the top of the salt water pool is provided with a reflux channel, and the inner bottom surface of the salt water pool is provided with a sedimentation tank. The reflux channel recovers the upper clear liquid of the salt water pool, and the sedimentation tank collects the sediment at the bottom of the salt water pool.

7. The retired wind turbine blade product-mixed fiber sorting system according to claim 1, characterized in that: The salt water pool is provided with a density meter, a thermometer and an electric heating device, wherein the density meter is used to measure the density of the calcium chloride solution in the salt water pool, the thermometer is used to measure the temperature of the calcium chloride solution in the salt water pool, and the electric heating device is used to adjust the temperature of the calcium chloride solution in the salt water pool.

8. The retired wind turbine blade product-mixed fiber sorting system according to claim 1, characterized in that: It also includes a baler, which is arranged on one side of the color sorter and is used to pack the color-sorted products.

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