Wind power blade deicing device with partition heating function

Abstract

The utility model belongs to the technical field of wind power equipment deicing, and particularly relates to a partitioned heating wind power blade deicing device which comprises a waste heat recovery heating mechanism and a first electric heating film. Wherein the waste heat recovery heating mechanism comprises a circulating heat exchange assembly and a heat conduction heating assembly, the heat conduction heating assembly is arranged at the position behind the front edge of the blade, and the circulating heat exchange assembly is used for absorbing heat generated by the generator set and transmitting the heat to the heat conduction heating assembly; the first electric heating film is arranged on the front edge of the blade. The first heating film is arranged on the front edge of the blade to melt ice on the front edge of the blade, the rest part is heated in a waste heat recovery mode and in an electric heating mode in a combined mode to form a water film, falling of the ice is accelerated through resistance between an ice layer and wind in the running process of the blade, energy consumption can be reduced, and the deicing efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of wind power equipment de-icing technology, specifically relating to a wind turbine blade de-icing device with zoned heating. Background Technology

[0002] For waste heat recovery heating and de-icing, existing technologies employ heat exchange, using heat generated by the generator set to assist in air heating, and then introducing the hot air into the wind turbine blades (hereinafter referred to as blades) to achieve de-icing. However, because blade manufacturing currently uses materials with poor thermal conductivity, such as balsa wood, as the core material, which provides excellent insulation, hot air is difficult to transfer from the blade's interior to the surface. In actual heating processes, a situation often arises where the internal temperature of the blade is high, while the surface temperature is low, resulting in poor de-icing performance and significant energy consumption. Summary of the Invention

[0003] The technical problem to be solved by this application is to provide a wind turbine blade de-icing device with zoned heating, which can reduce energy consumption and improve de-icing efficiency.

[0004] This application provides a wind turbine blade de-icing device with zoned heating, comprising:

[0005] The waste heat recovery heating mechanism includes a circulating heat exchange component and a heat conduction heating component. The heat conduction heating component is located behind the leading edge of the blade. The circulating heat exchange component is used to absorb the heat generated by the generator set and transfer it to the heat conduction heating component.

[0006] One type of electric heating film is placed on the leading edge of the blade.

[0007] Optionally, the thermally conductive heating assembly includes a thermally conductive layer attached to the outside of the blade sandwich layer and an electrically heated film attached to the outside of the thermally conductive layer.

[0008] Optionally, the thermally conductive heating assembly further includes a heat storage layer disposed between the blade sandwich layer and the thermally conductive layer.

[0009] Optionally, the thermally conductive heating assembly also includes multiple ventilation micropores, which sequentially penetrate the second electric heating film, the thermally conductive layer, the heat storage layer, and the blade sandwich layer.

[0010] Optionally, multiple ventilation micropores are evenly distributed.

[0011] Optionally, the power of the first electric heating film is greater than the power of the second electric heating film.

[0012] Optionally, the circulating heat exchange assembly includes a cooler mounted on the generator set, a first circulating pipe connected to the cooler, a rotary joint connected to the first circulating pipe, a second circulating pipe connected to the rotary joint, and a heat exchanger connected to the second circulating pipe. The heat exchanger is in contact with the heat-conducting heating assembly. The rotary joint is mounted on the generator hub, and the second circulating pipe and the heat exchanger are mounted inside the blades.

[0013] Optionally, the cooler is an air-cooled cooler.

[0014] Optionally, the wind turbine blade de-icing device also includes multiple ultrasonic transducers installed inside the blade.

[0015] Optionally, the thermally conductive heating assembly is provided with multiple ultrasonic transducers.

[0016] The beneficial effects of this application are that by arranging a heating film on the leading edge of the blade to melt the ice covering the leading edge, the remaining part is heated by a combination of waste heat recovery and electric heating to form a water film. By utilizing the resistance between the ice layer and the wind during blade operation, the ice covering is accelerated to fall off, which can reduce energy consumption and improve de-icing efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the wind turbine blade de-icing device of this application;

[0018] Figure 2 This is a schematic diagram of the structure of the thermally conductive heating assembly of this application;

[0019] Figure 3 This is a schematic diagram showing the positional relationship between the electric heating film, the thermally conductive heating component, and the ultrasonic transducer in this application.

[0020] Figure 4 This is a schematic diagram of the blade cross-section after the leading edge of the blade has melted.

[0021] In the diagram: 1.1 Generator set; 1.2 Generator hub; 1.3 Blade; 1.4 Blade sandwich layer; 1.5 Blade leading edge; 2.1 Ice layer; 110 Circulating heat exchange assembly; 111 Cooler; 112 Circulating pipeline one; 113 Rotary joint; 114 Circulating pipeline two; 115 Heat exchanger; 120 Thermal heating assembly; 121 Thermal conductive layer; 122 Electric heating film two; 123 Heat storage layer; 124 Ventilation micropores; 200 Electric heating film one; 300 Ultrasonic transducer. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0023] like Figure 1-4 As shown, this application provides a wind turbine blade de-icing device with zoned heating, comprising: a waste heat recovery heating mechanism and an electric heating film 200; wherein, the waste heat recovery heating mechanism includes a circulating heat exchange component 110 and a heat-conducting heating component 120, the heat-conducting heating component 120 being disposed at a position 1.5 or later on the leading edge of the blade, the circulating heat exchange component 110 being used to absorb the heat generated by the generator set 1.1 and transfer it to the heat-conducting heating component 120; the electric heating film 200 being disposed at the leading edge of the blade 1.3.

[0024] The electric heating de-icing process will inevitably consume some of the electrical energy generated by generator set 1.1. By adopting a waste heat recovery heating mechanism to recover the heat generated by generator set 1.1, the consumption of electrical energy is reduced. Furthermore, the heat transfer speed can be accelerated through the heat-conducting heating component 120, which is beneficial to improving the de-icing effect and also helps to reduce the internal temperature of blade 1.3.

[0025] During the operation of wind turbines (hereinafter referred to as wind turbines), surface icing takes various forms due to environmental changes. When the surface icing is thin and appears as a layer of clear, encapsulated ice, the wind turbine can still operate, but the icing is difficult to remove. Therefore, without shutting down the turbine, the heating film on the leading edge 1.5 of the blade is first activated. This heating film is directly energized and heated, melting the icing on the leading edge 1.5. Once the icing on the leading edge 1.5 is mostly melted, the heat-conducting heating component 120 is activated. This component primarily uses a waste heat recovery system for heating, while also incorporating electric heating, to melt the icing between the blade and 1.3. After the icing on the leading edge 1.5 melts, a certain height difference remains between the blade and the icing. The remaining portion of the icing is positioned relative to the blade as follows: Figure 4 As shown, the ice layer 2.1 is higher than the airfoil of blade 1.3. During wind turbine operation, the protrusion of the ice layer 2.1 on the surface of blade 1.3 increases air resistance, and the air resistance rises sharply at the height difference of the ice layer 2.1. When the heat-conducting heating component 120 melts the ice to a certain extent, a water film forms on the surface of blade 1.3. Due to the increased air resistance, the surface ice is quickly peeled off from the surface of blade 1.3. This reduces the energy consumption required for de-icing and shortens the de-icing time. When the ice layer is thick, the wind turbine is generally shut down to ensure its safety. In this state, the electric heating film 200 and the heat-conducting heating component 120 are turned on for heating.

[0026] In one embodiment, the thermally conductive heating assembly 120 includes a thermally conductive layer 121 attached to the outside of the blade sandwich layer 1.4 and an electric heating film 122 attached to the outside of the thermally conductive layer 121. Specifically, the electric heating film 120 and the electric heating film 122 are resistance wire heating films, carbon crystal heating films, carbon-based ink electric heating films, graphene electric heating films, or other electric heating films. The thermally conductive layer 121 is a copper foil, aluminum foil, or a polymer composite film containing metal particles, used to transfer the heat generated by the circulating heat exchange assembly 110 to the electric heating film 122, reducing the heating heat required for the electric heating film 122 to melt ice and reducing power consumption.

[0027] In one embodiment, such as Figure 2 As shown, the thermally conductive heating assembly 120 also includes a heat storage layer 123 disposed between the blade sandwich layer 1.4 and the thermally conductive layer 121. Specifically, the heat storage layer 123 is a heat storage silver film or a graphene heat storage film, which plays a role in continuous heat preservation and reducing heat loss.

[0028] In this embodiment, the electric heating film 122, the heat-conducting layer 121, the heat storage layer 123, and the blade sandwich layer 1.4 are bonded together with epoxy resin.

[0029] In one embodiment, the thermally conductive heating assembly 120 further includes a plurality of ventilation micropores 124, which sequentially penetrate the electric heating film 122, the thermally conductive layer 121, the heat storage layer 123, and the blade sandwich layer 14. This facilitates heat transfer and improves ice-melting efficiency.

[0030] In one embodiment, a plurality of ventilation micropores 124 are evenly distributed. Specifically, the evenly distributed plurality of ventilation micropores 124 facilitate the uniform transfer of heat, enabling more uniform ice melting.

[0031] In one embodiment, the power of the electric heating film 200 is greater than that of the electric heating film 122. Specifically, the electric heating film 200 is located at the leading edge 1.5 of the blade, where the ice needs to be completely melted. However, other parts of the blade 1.3 only need to melt the ice to form a water film. The power of the heating film 122 is smaller, and the heat transferred by the waste heat recovery heating mechanism is sufficient to form a water film. Therefore, the power of the heating film 122 is smaller, which achieves the effect of energy saving.

[0032] In one embodiment, the circulating heat exchange assembly 110 includes a cooler 111 disposed on the generator set 1.1, a first circulation pipe 112 connected to the cooler 111, a rotary joint 113 connected to the first circulation pipe 112, a second circulation pipe 114 connected to the rotary joint 113, and a heat exchanger 115 connected to the second circulation pipe 114. The heat exchanger 115 is in contact with the thermally conductive heating assembly 120. The rotary joint 113 is disposed on the generator hub 1.2, and the second circulation pipe 114 and the heat exchanger 115 are disposed within the blades 1.3. Specifically, the cooler 111 is an air-cooled cooler 111, which uses air circulation to remove the heat generated by the generator set 1.1. The heated cold air enters the second circulation pipe 114 and the heat exchanger 115 in the blades 1.3 through the first circulation pipe 112 and the rotary joint 113. The heat exchanger 115 heats up to heat the thermally conductive heating assembly 120, and the cooled air flows back to the cooler 111 for circulation.

[0033] It should be noted that the circulating heat exchange component 110 can also be an existing wind turbine heat recovery device, used to heat the blades 1.3 and the thermal heating component 120.

[0034] In one embodiment, such as Figure 3 As shown, the device also includes multiple ultrasonic transducers 300 installed within the blade 1.3. Using ultrasonic devices to break large ice clods into smaller pieces can effectively reduce the damage to the wind turbine and the surrounding environment during the ice clod shedding process.

[0035] In one embodiment, the thermally conductive heating assembly 120 is provided with a plurality of ultrasonic transducers 300 to improve the efficiency of breaking ice into several small pieces.

[0036] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0037] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A partitioned heated wind turbine blade de-icing device, characterized in that, The application relates to a waste heat recovery heating mechanism, which comprises a circulating heat exchange component (110) and a heat conduction heating component (120), the heat conduction heating component (120) is arranged at a position behind a blade leading edge (1.5), the circulating heat exchange component (110) is used for absorbing heat generated by a generator set (1.1) and transmitting the heat to the heat conduction heating component (120), and an electric heating film one (200) is arranged at the blade leading edge (1.5). The heat conduction heating component (120) comprises a heat conduction layer (121) attached to the outer side of a blade sandwich layer (1.4), an electric heating film two (122) attached to the outer side of the heat conduction layer (121), a heat storage layer (123) arranged between the blade sandwich layer (1.4) and the heat conduction layer (121), and a plurality of air-permeable micropores (124) sequentially penetrating through the electric heating film two (122), the heat conduction layer (121), the heat storage layer (123) and the blade sandwich layer (1.4). The air-permeable micropores (124) are uniformly distributed. The power of the electric heating film one (200) is greater than that of the electric heating film two (122). The circulating heat exchange component (110) comprises a cooler (111) arranged on the generator set (1.1), a circulating pipeline one (112) connected with the cooler (111), a rotating joint (113) connected with the circulating pipeline one (112), a circulating pipeline two (114) connected with the rotating joint (113), and a heat exchanger (115) connected with the circulating pipeline two (114), the heat exchanger (115) is attached to the heat conduction heating component (120), the rotating joint (113) is arranged on a generator hub (1.2), and the circulating pipeline two (114) and the heat exchanger (115) are arranged in a blade (1.3). The cooler (111) is a wind-cooled cooler (111).

2. A wind turbine blade de-icing device according to claim 1, characterised in that A plurality of ultrasonic transducers (300) are arranged in the blade (1.3).

3. A wind turbine blade de-icing device according to any of claims 1, characterised in that, The heat conduction heating component (120) is provided with a plurality of ultrasonic transducers (300).

4. The wind turbine blade de-icing device according to claim 1, characterized in that, ​ 5. A wind turbine blade de-icing device according to claim 4, characterised in that, ​ 6. The wind turbine blade de-icing device according to claim 1, characterized in that, ​ 7. A wind turbine blade de-icing device according to claim 6, characterised in that, ​

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