Heat treatment system and treatment method for high-molecular excess materials of fan blades

Abstract

The invention provides a fan blade macromolecule excess material heat treatment system and method, the treatment system comprises a fluidization reaction kettle, a liquid separator, an extraction liquid tank and a fractionator, the fluidization reaction kettle is used for decomposing fan blades into glass fibers and epoxy resin, the liquid separator is used for dissolving the epoxy resin and separating an obtained liquid-liquid mixture, and the extraction liquid tank is used for separating the liquid-liquid mixture; and returning the separated aqueous solution to the fluidization reaction kettle for recycling, and feeding the resin degradation product and the carried extract liquor into a fractionator. The fractionator is used for separating the resin degradation product from the carried extraction liquid, the generated extraction liquid steam is condensed by the cooler and then is fed into the extraction liquid tank for recycling, and the resin degradation product is fed into the product tank for recycling. According to the invention, the glass fiber obtained after heat treatment of the fan blade and the byproduct epoxy resin can be recycled respectively.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine blade recycling, and particularly to a heat treatment system and method for polymer leftovers of wind turbine blades. Background Art

[0002] Wind turbines are the main equipment for wind power generation. Wind turbine blades convert wind energy into mechanical energy, which is the key part of the energy conversion of wind turbines and also the component with the highest cost of the wind turbines. Wind turbine blades are successively the blade root, blade middle and blade tip from the inside to the outside with the rotor as the center, and are generally composed of thermosetting materials (such as epoxy resin), thermosetting fiber reinforced materials, adhesives (epoxy adhesives, polyurethane adhesives, etc.), balsa wood, polyvinyl chloride (PVC), coatings, metal parts and other components. Among them, the composite material is the component with the highest value, and epoxy resin in the polymer material has the highest proportion.

[0003] The disposal methods of composite material corner waste and waste are usually landfilling and incineration. The recycling technologies that have reached the industrialization stage and are being studied currently include: reuse method, mechanical crushing method, pyrolysis method, energy acquisition method (power plant incineration), co-processing method in cement kiln, biodegradation method. Each recycling technology has its own advantages and disadvantages. But generally, there is a common problem that the recycling value level of glass fiber materials is low and the economic benefit is poor. Under the policy guidance of the construction of the national circular economy society, the above value development prospects are limited, and the industry needs to develop a blade polymer material recycling technology with a higher level of resource utilization. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related technologies to some extent. For this reason, the embodiments of the present invention provide a heat treatment system and method for polymer leftovers of wind turbine blades, which can process and recycle the polymer leftovers while recycling the wind turbine blades.

[0005] On one hand, an embodiment of the present invention provides a heat treatment system for polymer scraps of fan blades, including: a fluidized reaction kettle, a liquid distributor, an extraction liquid tank and a fractionator. There is a reaction chamber in the fluidized reaction kettle to decompose the fan blades into glass fibers and epoxy resin. The reaction chamber has an epoxy resin discharge port and a liquid return port. The liquid distributor has a first feed port, a second feed port, a first discharge port and a second discharge port. The first feed port of the liquid distributor is connected to the epoxy resin discharge port of the fluidized reaction kettle, and the first discharge port of the liquid distributor is connected to the liquid return port of the fluidized reaction kettle to return the separated aqueous solution to the fluidized reaction kettle. The extraction liquid tank has a liquid outlet and a liquid return port. The extraction liquid tank is used to hold the extraction liquid. The liquid outlet of the extraction liquid tank is connected to the second feed port of the liquid distributor to introduce the extraction liquid for dissolving epoxy resin into the liquid distributor. The fractionator has a feed port, a discharge port and an exhaust port. The feed port of the fractionator is connected to the second discharge port of the liquid distributor to fractionate the product of decomposing epoxy resin in the liquid distributor. The exhaust port of the fractionator is connected to the liquid return port of the extraction liquid tank through a liquid return pipe, and a cooler is connected to the liquid return pipe to condense the extraction liquid vapor generated by fractionation in the fractionator into extraction liquid.

[0006] In some embodiments, a product tank is arranged at the discharge port of the fractionator to receive the colloid generated after decomposing epoxy resin in the liquid distributor.

[0007] In some embodiments, a heat-resistant solution pump is connected to the connecting pipeline between the epoxy resin discharge port of the fluidized reaction kettle and the first feed port of the liquid distributor.

[0008] In some embodiments, a reaction cylinder is arranged in the reaction chamber. The reaction cylinder is suitable for placing the fan blades to be treated. A plurality of through holes are evenly distributed on the side wall of the reaction cylinder to allow the reaction liquid in the reaction chamber to flow into the reaction cylinder and contact the fan blades to react.

[0009] In some embodiments, a rotating support base is connected to the bottom of the reaction chamber. The reaction cylinder is fixedly connected to the upper end of the rotating support base. The center of the bottom of the rotating support base is connected to a reducer to drive the rotating support base to rotate horizontally and drive the reaction cylinder to rotate synchronously.

[0010] In some embodiments, a plurality of reaction cylinders are arranged and evenly distributed on the upper end of the rotating support base.

[0011] On the other hand, an embodiment of the present invention provides a heat treatment method for polymer scraps of fan blades, using the above heat treatment system for polymer scraps of fan blades, including the following steps:

[0012] Cut the fan blade into long strip-shaped blade stock, put the blade stock into the reaction cylinder, add the reaction liquid into the fluidized reaction kettle, heat up, and the reaction liquid decomposes the blade stock into epoxy resin and glass fiber. The glass fiber stays in the reaction cylinder for recycling, and the epoxy resin flows from the through holes of the reaction cylinder into the fluidized reaction kettle.

[0013] The epoxy resin and the reaction liquid in the fluidized reaction kettle are sent into the separator by a heat-resistant solution pump. The extraction liquid tank feeds the stored extraction liquid into the separator, where it reacts with the epoxy resin to dissolve the epoxy resin, obtaining a liquid-liquid mixture. The separator separates the liquid-liquid mixture to obtain an aqueous solution and a resin degradation product.

[0014] The aqueous solution returns to the fluidized reaction kettle for recycling. The resin degradation product and the carried extraction liquid enter the fractionator. The fractionator separates the resin degradation product from the extraction liquid. The generated extraction liquid vapor is condensed by the cooler and then sent back to the extraction liquid tank for reuse. The resin degradation product is sent to the product tank for recycling.

[0015] After the fluidized reaction kettle operates for 8 - 12 hours, cool it down, open the fluidized reaction kettle, and recycle the glass fiber.

[0016] In some embodiments, the reaction liquid is an aqueous solution of zinc chloride with a mass concentration greater than 60%, and the extraction liquid is carbon tetrachloride.

[0017] In some embodiments, after adding the reaction liquid into the fluidized reaction kettle, heat it up to 180 - 220 °C, and after operating for 8 - 12 hours, cool it down to below 45 °C.

[0018] In some embodiments, the reaction cylinder is connected to the fluidized reaction kettle through a rotating support base. The rotating support base drives the reaction cylinder to rotate centrifugally at a speed of 500 - 800 r / min. Description of the Drawings

[0019] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings.

[0020] Wherein:

[0021] Figure 1 is a schematic structural diagram of the heat treatment system for the polymer waste of the fan blade in the embodiment of the present invention;

[0022] Reference Signs:

[0023] 1. Fluidized reaction kettle; 2. Rotating support base; 3. Reaction cylinder; 4. Heat-resistant solution pump; 5. Separator; 6. Fractionator; 7. Product tank; 8. Extraction liquid tank; 9. Cooler;. Detailed Embodiments

[0024] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation of the present invention.

[0025] The heat treatment system and method for polymer residues of fan blades according to embodiments of the present invention will be described below with reference to the accompanying drawings.

[0026] As Figure 1 shown, on the one hand, an embodiment of the present invention provides a heat treatment system for polymer residues of fan blades, including: a fluidized reaction kettle 1, a liquid separator 5, an extraction liquid tank 8 and a fractionator 6. The fluidized reaction kettle 1 has a reaction chamber for decomposing the fan blade into glass fiber and epoxy resin. The reaction chamber has an epoxy resin discharge port and a return liquid port. The liquid separator 5 has a first feed port, a second feed port, a first discharge port and a second discharge port. The first feed port of the liquid separator 5 is connected to the epoxy resin discharge port of the fluidized reaction kettle 1, and the first discharge port of the liquid separator 5 is connected to the return liquid port of the fluidized reaction kettle 1 to return the separated aqueous solution to the fluidized reaction kettle 1. The extraction liquid tank 8 has a liquid outlet and a return liquid port and is used to contain the extraction liquid. The liquid outlet of the extraction liquid tank 8 is connected to the second feed port of the liquid separator 5 to introduce the extraction liquid for dissolving the epoxy resin into the liquid separator 5. The fractionator 6 has a feed port, a discharge port and an exhaust port. The feed port of the fractionator 6 is connected to the second discharge port of the liquid separator 5 to fractionate the product of decomposing the epoxy resin in the liquid separator 5. The exhaust port of the fractionator 6 is connected to the return liquid port of the extraction liquid tank 8 through a return liquid pipe, and a cooler 9 is connected to the return liquid pipe to condense the extraction liquid steam generated by fractionation in the fractionator 6 into an extraction liquid.

[0027] By connecting the fluidized reaction kettle 1 to the liquid separator 5, the extraction liquid tank 8 and the fractionator 6, the embodiments of the present invention can respectively recycle the glass fiber and the by-product epoxy resin obtained after heat treatment of the fan blade.

[0028] Among them, the liquid separator 5 is used to dissolve the epoxy resin and separate the obtained liquid-liquid mixture, so that the separated aqueous solution is returned to the fluidized reaction kettle 1 for recycling, and the resin degradation product and the carried extraction liquid enter the fractionator 6.

[0029] The fractionator 6 is used to separate the resin degradation product and the carried extraction liquid. The generated extraction liquid steam is condensed by the cooler 9 and then sent to the extraction liquid tank 8 for reuse, and the resin degradation product is sent to the product tank 7 for recycling.

[0030] Furthermore, a cover plate that can be opened and closed is provided at the top of the fluidized reaction kettle 1 for feeding and discharging the fan blade.

[0031] In some embodiments, a product tank 7 is provided at the discharge port of the fractionator 6 to receive the colloid generated after decomposing the epoxy resin in the liquid separator 5.

[0032] In some embodiments, a heat-resistant solution pump 4 is connected to the connecting pipeline between the epoxy resin discharge port of the fluidized reaction kettle 1 and the first feed port of the liquid distributor 5. This enables the epoxy resin and the reaction liquid in the fluidized reaction kettle 1 to be quickly fed into the liquid distributor 5.

[0033] Furthermore, the material of the heat-resistant solution pump 4 can be high-temperature resistant materials such as stainless steel and ceramics.

[0034] In some embodiments, a reaction cylinder 3 is provided in the reaction chamber. The reaction cylinder 3 is adapted to place the fan blades to be processed. A plurality of through holes are evenly distributed on the side wall of the reaction cylinder 3, so that the reaction liquid in the reaction chamber flows into the reaction cylinder 3 and contacts the fan blades to react.

[0035] In some embodiments, a rotating support base 2 is connected to the bottom of the reaction chamber. The reaction cylinder 3 is fixedly connected to the upper end of the rotating support base 2. The center of the bottom of the rotating support base 2 is connected to a speed reducer to drive the rotating support base 2 to rotate horizontally and drive the reaction cylinder 3 to rotate synchronously.

[0036] In some embodiments, there are a plurality of reaction cylinders 3, which are evenly distributed on the upper end of the rotating support base 2.

[0037] As Figure 1 shown, another embodiment of the present invention provides a heat treatment method for polymer residues of fan blades. Using the above-mentioned heat treatment system for polymer residues of fan blades, it includes the following steps:

[0038] Cut the fan blades into long strip-shaped blade strips, place the blade strips into the reaction cylinder 3, add the reaction liquid into the fluidized reaction kettle 1, raise the temperature, the reaction liquid decomposes the blade strips into epoxy resin and glass fiber, the glass fiber remains in the reaction cylinder 3 waiting to be recycled, and the epoxy resin flows from the through holes of the reaction cylinder 3 into the fluidized reaction kettle 1.

[0039] The epoxy resin and the reaction liquid in the fluidized reaction kettle 1 are sent into the liquid distributor 5 through the heat-resistant solution pump 4. The extraction liquid tank 8 feeds the stored extraction liquid into the liquid distributor 5, reacts with the epoxy resin to dissolve the epoxy resin, and obtains a liquid-liquid mixture. The liquid distributor 5 separates the liquid-liquid mixture to obtain an aqueous solution and a resin degradation product.

[0040] The aqueous solution returns to the fluidized reaction kettle 1 for recycling. The resin degradation product and the carried extraction liquid enter the fractionator 6. The fractionator 6 separates the resin degradation product and the extraction liquid. The generated extraction liquid vapor is condensed by the cooler 9 and then sent back to the extraction liquid tank 8 for reuse. The resin degradation product is sent to the product tank 7 for recycling.

[0041] After the fluidized reaction kettle 1 operates for 8 - 12 hours, it cools down, and the fluidized reaction kettle 1 is opened to recycle the glass fiber.

[0042] In the embodiments of the present invention, by adopting the above method, the glass fiber and the by-product epoxy resin obtained after the heat treatment of the fan blade can be recycled respectively.

[0043] It should be noted that the degraded epoxy resin is a jelly-like colloid, insoluble in aqueous solution, but can pass through the through holes of the reaction cylinder 3 and enter the fluidized reaction kettle 1. In the liquid distributor 5, after the extract reacts with the epoxy resin, in the obtained liquid-liquid mixture, due to the large density difference, it can be separated by the liquid distributor 5. In the fractionator 6, due to the different boiling points of the extract and the resin degradation product in the colloid state, it can be separated by the fractionator 6.

[0044] In some embodiments, the reaction liquid is an aqueous zinc chloride solution with a mass concentration greater than 60%, and the extract is carbon tetrachloride.

[0045] In some embodiments, after adding the reaction liquid into the fluidized reaction kettle 1, the temperature is raised to 180 - 220 °C, and after running for 8 - 12 h, the temperature is lowered to below 45 °C.

[0046] The reaction temperature of the fluidized reaction kettle 1 is set to 180 - 220 °C, and the glass fiber obtained at this temperature has excellent performance and high value.

[0047] In some embodiments, the reaction cylinder 3 is connected to the fluidized reaction kettle 1 through a rotating support base 2, and the rotating support base 2 drives the reaction cylinder 3 to rotate centrifugally at a speed of 500 - 800 r / min.

[0048] If the rotation speed is lower than 500 r / min, the resin degradation product in the reaction cylinder 3 cannot escape into the reaction liquid in the fluidized reaction kettle 1. If the rotation speed is higher than 800 r / min, the glass fiber to be recycled in the reaction cylinder 3 will also escape into the reaction liquid in the fluidized reaction kettle 1.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0050] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] In the present invention, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. should be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0053] In the present invention, terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0054] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A fan blade polymer waste heat treatment system, characterized in that: include: A fluidized reactor, wherein the fluidized reactor has a reaction chamber to decompose the fan blades into glass fibers and epoxy resin, and the reaction chamber has an epoxy resin discharge port and a liquid return port; A liquid separator, the liquid separator having a first feed port, a second feed port, a first discharge port and a second discharge port, the first feed port of the liquid separator being connected to the epoxy resin discharge port of the fluidized reactor, and the first discharge port of the liquid separator being connected to the liquid return port of the fluidized reactor, so as to return the separated aqueous solution to the fluidized reactor; An extraction liquid tank, the extraction liquid tank having a liquid outlet and a liquid return port, the extraction liquid tank is used to contain the extraction liquid, the liquid outlet of the extraction liquid tank is connected to the second feed port of the liquid separator, so as to introduce the extraction liquid for dissolving the epoxy resin into the liquid separator; A fractionator, the fractionator having a feed port, a discharge port and an exhaust port, the feed port of the fractionator being connected to the second discharge port of the liquid separator so as to fractionate the product of decomposing the epoxy resin in the liquid separator, the exhaust port of the fractionator being connected to the liquid return port of the extraction liquid tank through a liquid return pipe, the liquid return pipe being connected to a cooler so as to condense the extraction liquid vapor generated by the distillation of the fractionator into an extraction liquid.

2. The fan blade polymer waste heat treatment system according to claim 1 is characterized in that: A product tank is arranged at the discharge port of the fractionator to receive the colloid produced after the epoxy resin is decomposed in the liquid separator.

3. The fan blade polymer waste heat treatment system according to claim 1, characterized in that: A heat-resistant solution pump is connected to the connecting pipeline between the epoxy resin discharge port of the fluidized reactor and the first feed port of the liquid separator.

4. The fan blade polymer waste heat treatment system according to claim 1, characterized in that: A reaction cylinder is arranged in the reaction chamber, and the reaction cylinder is suitable for placing the fan blades to be processed. The side wall of the reaction cylinder is evenly provided with a plurality of through holes, so that the reaction liquid in the reaction chamber flows into the reaction cylinder to contact the fan blades for reaction.

5. The fan blade polymer waste heat treatment system according to claim 4, characterized in that: The bottom of the reaction chamber is connected to a rotating support base, the reaction tube is fixedly connected to the upper end of the rotating support base, and the center of the bottom of the rotating support base is connected to a reducer to drive the rotating support base to rotate horizontally and drive the reaction tube to rotate synchronously.

6. The fan blade polymer waste heat treatment system according to claim 5, characterized in that: The reaction cylinders are provided in a plurality and are evenly arranged on the upper end of the rotating support base.

7. A method for heat treatment of residual polymer materials of fan blades, characterized in that: The fan blade polymer waste heat treatment system according to any one of claims 1 to 6 comprises the following steps: Cut the fan blades into long strips, put the blade strips into a reaction cylinder, add a reaction liquid into the fluidized reactor, increase the temperature, and the reaction liquid decomposes the blade strips into epoxy resin and glass fiber, the glass fiber remains in the reaction cylinder to be recycled, and the epoxy resin flows from the through hole of the reaction cylinder into the fluidized reactor; The epoxy resin and the reaction liquid in the fluidized reactor are pumped into the liquid separator through a heat-resistant solution pump, the extraction liquid tank passes the stored extraction liquid into the liquid separator, reacts with the epoxy resin to dissolve the epoxy resin, and obtains a liquid-liquid mixture, and the liquid separator separates the liquid-liquid mixture to obtain an aqueous solution and a resin degradation product; The aqueous solution is returned to the fluidized reactor for recycling, the resin degradation products and the carried extract enter the fractionator, the fractionator separates the resin degradation products from the extract, the generated extract vapor is condensed by the cooler and then sent to the extract tank for recycling, and the resin degradation products are sent to the product tank for recycling; The fluidized bed reactor is run for 8 to 12 hours and then cooled down, and the fluidized bed reactor is opened to recover the glass fibers.

8. The method for heat treatment of residual polymer materials of fan blades according to claim 7, characterized in that: The reaction liquid is a zinc chloride aqueous solution with a mass concentration greater than 60%, and the extract is carbon tetrachloride.

9. The method for heat treatment of residual polymer materials of fan blades according to claim 7, characterized in that: After the reaction liquid is added into the fluidized reactor, the temperature is raised to 180-220° C., and after running for 8-12 hours, the temperature is lowered to below 45° C.

10. The method for heat treatment of residual polymer materials of fan blades according to claim 7, characterized in that: The reaction tube is connected to the fluidized reactor via a rotating support base, and the rotating support base drives the reaction tube to centrifugally rotate at a speed of 500 to 800 r / min.

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