Wind turbine blade de-icing heating device

Abstract

This application discloses a wind turbine blade de-icing heating device, comprising: multiple heating zones distributed along the length of the blade; each heating zone is provided with a heat dissipation structure; a heat transfer medium flows inside each heat dissipation structure; each heat dissipation structure is connected to a heating device for heating the heat transfer medium; each heat dissipation structure includes a first input pipe and a first output pipe connected to the heating device; a second input pipe and a second output pipe are disposed between the first input pipe and the first output pipe; the second input pipe is connected to the first input pipe; the second output pipe is connected to the first output pipe; multiple heat dissipation pipes are connected between the second input pipe and the second output pipe; and the heat dissipation pipes are connected to the outer shell of the blade; the multiple heat dissipation structures provide separate heating to the multiple heating zones, facilitating precise and centralized heating for high icing locations.

Description

Technical Field

[0001] This application relates to the field of wind turbine blade de-icing technology, and in particular to a wind turbine blade de-icing heating device. Background Technology

[0002] Wind power (wind turbine power generation) is a clean energy technology that uses wind power to drive the rotation of wind turbine blades, converting wind energy into electrical energy. It is characterized by being renewable and having low carbon emissions, and is one of the core areas of global energy transition. Because wind turbines are usually located in high-altitude areas with abundant wind energy, the air temperature is usually low, making wind turbine blades prone to icing.

[0003] Icing on wind turbine blades increases load, alters the aerodynamic shape of the blades, severely impacts power generation efficiency, and can even cause structural damage. Therefore, de-icing technology is a crucial research area in the wind power industry. Currently, wind turbine blade de-icing methods can be broadly categorized into active de-icing (requiring external energy input) and passive de-icing (relying on material / structural design and requiring no additional energy).

[0004] Existing active de-icing methods mainly rely on electrothermal de-icing and hot gas de-icing. Hot gas de-icing primarily involves delivering hot gas through pipelines to various locations on the blades; however, existing pipeline heating systems struggle to precisely control the heating situation in different areas. Therefore, there is a need to research and develop a de-icing heating device for wind turbine blades. Utility Model Content

[0005] The main purpose of this application is to propose a wind turbine blade de-icing heating device, which aims to solve the problem that existing pipeline heating systems are unable to accurately control the heating situation in different areas.

[0006] To achieve the above objectives, the wind turbine blade de-icing heating device proposed in this application includes: multiple heating zones distributed along the blade length direction, each of the multiple heating zones being provided with a heat dissipation structure, a heat transfer medium flowing inside the heat dissipation structure, and each of the multiple heat dissipation structures being connected to a heating device, the heating device being used to heat the heat transfer medium. The heat dissipation structure includes a first input pipe and a first output pipe connected to the heating equipment. A second input pipe and a second output pipe are provided between the first input pipe and the first output pipe. The second input pipe is connected to the first input pipe, and the second output pipe is connected to the first output pipe. A plurality of heat dissipation pipes are connected between the second input pipe and the second output pipe. The heat dissipation pipes are connected to the outer shell of the blade. Each of the first input pipes is equipped with a solenoid valve, and the solenoid valve is electrically connected to the controller.

[0007] Optionally, both the second input pipe and the second output pipe are configured as ring structures.

[0008] Optionally, the heat dissipation structure further includes a plurality of first heat dissipation fins evenly distributed along the axis of the heat dissipation pipes, the first heat dissipation fins being fixedly connected to the plurality of heat dissipation pipes, and the first heat dissipation fins being fixedly connected to the outer shell of the blades.

[0009] Optionally, the first heat sink has a ring structure, and the shape of the first heat sink is consistent with the cross-sectional curve shape at the location of the blade.

[0010] Optionally, a plurality of second heat sinks are provided between two adjacent heat dissipation structures. The first end of the second heat sink is fixedly connected to the second input pipe of one of the heat dissipation structures, and the second end of the second heat sink is fixedly connected to the second output pipe of the other heat dissipation structure. The second heat sink is fixedly connected to the outer shell of the blade.

[0011] Optionally, both the first heat sink and the second heat sink are made of aluminum alloy.

[0012] Optionally, the cross-sectional area of ​​the heat dissipation pipe is smaller than the cross-sectional areas of the second input pipe and the second output pipe.

[0013] Optionally, the length of the plurality of heating zones gradually decreases from the leaf root to the leaf tip.

[0014] Optionally, the first input pipe and the first output pipe are structures made of titanium alloy, and an insulation layer is provided on the outside of the first input pipe and the first output pipe.

[0015] Optionally, the second input pipe, the second output pipe, and the heat dissipation pipe are structures made of aluminum alloy.

[0016] This application's technical solution involves setting up multiple heating zones distributed along the blade's length. Each heating zone is equipped with a heat dissipation structure, and a heat transfer medium flows inside each heat dissipation structure. These heat dissipation structures are connected to a heating device, which heats the heat transfer medium. Each heat dissipation structure includes a first input pipe and a first output pipe connected to the heating device. A second input pipe and a second output pipe are connected between the first input pipe and the first output pipe. The second input pipe is connected to the first input pipe, and the second output pipe is connected to the first output pipe. Multiple heat dissipation pipes are connected between the second input pipe and the second output pipe, and these heat dissipation pipes are connected to the blade's outer shell. Each first input pipe is equipped with a solenoid valve, which is electrically connected to a controller. After the heating device heats the heat transfer medium, it is transported through the first input pipes to the heat dissipation structures in each heating zone. The heat transfer medium is then diverted through the second input pipes to the multiple heat dissipation pipes, where it contacts the blade's outer shell, transferring heat to the blade surface to melt the ice layer. Subsequently, the cooled heat transfer medium flows back through the second output pipe to the first output pipe, and finally returns to the heating device for recirculation. By circulating the heat transfer medium between the heating equipment and the heat dissipation structure, the surface temperature of various parts of the blades can be quickly increased, achieving rapid de-icing; through the control of solenoid valves, multiple heat dissipation structures can supply heat to multiple heating zones separately, facilitating precise and centralized heating for high icing locations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the wind turbine blade de-icing heating device of this application; Figure 2 For this application Figure 1 Enlarged schematic diagram of the local structure at point A; Figure 3 This is a schematic diagram of the heat dissipation structure in the wind turbine blade de-icing heating device of this application.

[0019] Explanation of icon numbers: 1. Blade; 2. Heating zone; 3. Heat dissipation structure; 310. First input pipe; 311. Second input pipe; 320. First output pipe; 321. Second output pipe; 330. Heat dissipation pipe; 340. First heat sink; 4. Second heat sink.

[0020] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0025] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0026] Existing active de-icing methods mainly rely on electrothermal de-icing and hot gas de-icing. Hot gas de-icing primarily involves delivering hot gas through pipelines to various locations on the blades; however, existing pipeline heating systems struggle to precisely control the heating situation in different areas. Therefore, there is a need to research and develop a de-icing heating device for wind turbine blades.

[0027] In view of this, this application proposes a wind turbine blade de-icing heating device.

[0028] In the embodiments of this application, reference is made to Figures 1 to 3 The aforementioned wind turbine blade de-icing heating device includes: multiple heating zones 2 distributed along the length of the blade 1; each heating zone 2 is provided with a heat dissipation structure 3; a heat transfer medium flows inside the heat dissipation structure 3; each heat dissipation structure 3 is connected to a heating device (not shown in the figure); the heating device is used to heat the heat transfer medium; the heat dissipation structure 3 includes a first input pipe 310 and a first output pipe 320 connected to the heating device; a second input pipe 311 and a second output pipe 321 are provided between the first input pipe 310 and the first output pipe 320; the second input pipe 311 is connected to the first input pipe 310; the second output pipe 321 is connected to the first output pipe 320; multiple heat dissipation pipes 330 are connected between the second input pipe 311 and the second output pipe 321; the heat dissipation pipes 330 are connected to the outer shell of the blade 1; each first input pipe 310 is provided with a solenoid valve, which is electrically connected to a controller.

[0029] Specifically, the heating equipment includes a heating device and a pressure pump. The heating device heats the heat transfer medium, and the pressure pump drives the heat transfer medium to flow. The heat transfer medium can be water or air. After heating the heat transfer medium, the heating equipment delivers it to the heat dissipation structure 3 of each heating zone 2 through each first input pipe 310. The heat transfer medium is diverted to multiple heat dissipation pipes 330 through the second input pipe 311. The heat dissipation pipes 330 contact the outer shell of the blade 1, transferring heat to the surface of the blade 1 to melt the ice layer. Subsequently, the cooled heat transfer medium flows back to the first output pipe 320 through the second output pipe 321, and finally returns to the heating equipment for recirculation. Heat transfer is achieved through a closed-loop heat transfer system. Multiple heating zones 2 are distributed along the length of the blade 1 to accommodate the icing differences in different parts of the blade 1 (such as the blade root, blade middle, and blade tip). The heat dissipation pipes 330 are in direct contact with the outer shell of the blade 1, using conduction heat transfer to transfer heat to the ice layer, while convection heat transfer enhances the circulation of the heat transfer medium.

[0030] In this embodiment, both the second input pipe 311 and the second output pipe 321 are configured as annular structures. The second input pipe 311 and the second output pipe 321 form annular structures on the cross-section of the blade 1. The heat transfer medium flows circumferentially within the annular pipe and is evenly distributed to each heat dissipation pipe 330. The annular structure ensures that the heat transfer medium is evenly distributed within the cross-section of the blade 1 through circumferential flow uniformity, avoiding local overheating or cooling. Combined with the centrifugal force when the blade 1 rotates, the annular pipe can further enhance fluid turbulence and improve heat exchange efficiency.

[0031] In this embodiment, the heat dissipation structure 3 further includes a plurality of first heat dissipation fins 340 evenly distributed along the axis of the heat dissipation pipes 330. The first heat dissipation fins 340 are fixedly connected to the plurality of heat dissipation pipes 330 and fixedly connected to the outer shell of the blades 1. The first heat dissipation fins 340, evenly distributed along the axis of the heat dissipation pipes 330, are fixed to the outer shell of the blades 1, which quickly conducts the heat from the heat dissipation pipes 330 to the surface of the blades 1. The heat dissipation fins enhance heat conduction and heat transfer by increasing the heat dissipation area, thus accelerating the melting of the ice layer. The evenly distributed heat dissipation fins can disperse heat to the surface of the blades 1, avoiding local heat concentration. The heat dissipation fins increase the heat dissipation per unit length of pipe by 30%-50%. The rigid connection between the heat dissipation fins and the pipes and the outer shell of the blades 1 enhances the vibration resistance of the system.

[0032] In this embodiment, the first heat sink 340 is an annular structure, and its shape is consistent with the cross-sectional curve of the blade 1. The annular heat sink fits the cross-sectional curve of the blade 1 and is in close contact with the outer shell, forming a seamless heat conduction path. The irregular design improves heat conduction efficiency by reducing contact thermal resistance, while the annular structure enhances circumferential heat diffusion. For example, the heat sink at the blade root has a larger curvature to match the thick cross-section of the blade root, while the curvature at the blade tip is smaller to match the thin cross-section.

[0033] In this embodiment, multiple second heat sinks 4 are arranged between two adjacent heat dissipation structures 3. The first end of the second heat sink 4 is fixedly connected to the second input pipe 311 of one of the heat dissipation structures 3, and the second end of the second heat sink 4 is fixedly connected to the second output pipe 321 of the other heat dissipation structure 3. The second heat sink 4 is fixedly connected to the outer shell of the blade 1. The second heat sinks 4 between adjacent heat dissipation structures 3 connect adjacent second input pipes 311 and second output pipes 321, forming a heat conduction path across the heating zone 2. The second heat sink 4 acts as a thermal bridge to balance the temperature difference between adjacent heating zones 2 and avoid local overcooling caused by uneven heating power.

[0034] In this embodiment, both the first heat sink 340 and the second heat sink 4 are made of aluminum alloy. The aluminum alloy heat sink quickly absorbs the heat from the heat dissipation pipe 330 and transfers the heat to the surface of the blade 1 through its high thermal conductivity; moreover, aluminum has a low density, which reduces the load on the blade 1, thus achieving both lightweight design and efficient heat conduction.

[0035] In this embodiment, the cross-sectional area of ​​the heat dissipation pipe 330 is smaller than that of the second input pipe 311 and the second output pipe 321. The smaller cross-sectional area of ​​the heat dissipation pipe 330 leads to an increase in the flow velocity of the heat transfer medium within the heat dissipation pipe 330; according to the fluid continuity equation, the reduced cross-sectional area increases the flow velocity, thereby enhancing the convective heat transfer coefficient.

[0036] In this embodiment, due to the high wind speed and centrifugal force at the tip of blade 1, the risk of icing is higher and the ice layer is thicker, requiring higher thermal power; the length of the multiple heating zones 2 gradually decreases from the root to the tip of blade 1. The gradual shortening of the length of the heating zone 2 from the root to the tip results in a higher heating power density in the tip region.

[0037] In this embodiment, the first input pipe 310 and the first output pipe 320 are structures made of titanium alloy, and an insulation layer is provided on the outside of the first input pipe 310 and the first output pipe 320. The insulation layer can be made of ceramic fiber material. The high strength and corrosion resistance of titanium alloy ensure the reliability of the main pipe; the thermal conductivity of the ceramic fiber insulation layer is <0.05 W / m・K, which can reduce heat loss by more than 50%.

[0038] In this embodiment, the second input pipe 311, the second output pipe 321, and the heat dissipation pipe 330 are structures made of aluminum alloy. The aluminum alloy second input pipe 311, second output pipe 321, and heat dissipation pipe 330 can quickly conduct heat to the heat sink; at the same time, the lightweight characteristics reduce the overall weight of the blade 1.

[0039] This application's technical solution involves setting up multiple heating zones distributed along the blade's length. Each heating zone has a heat dissipation structure, and a heat transfer medium flows inside the heat dissipation structure. These heat dissipation structures are connected to heating equipment, which heats the heat transfer medium. Each heat dissipation structure includes a first input pipe and a first output pipe connected to the heating equipment. A second input pipe and a second output pipe are located between the first input and first output pipes. The second input pipe is connected to the first input pipe, and the second output pipe is connected to the first output pipe. Multiple heat dissipation pipes connect the second input and second output pipes and are connected to the blade's outer shell. Each first input pipe is equipped with a solenoid valve, which is electrically connected to a controller. After heating the heat transfer medium, the heating equipment delivers it to the heat dissipation structure of each heating zone through the first input pipes. The heat transfer medium is then distributed through the second input pipes to the multiple heat dissipation pipes, where it contacts the blade's outer shell, transferring heat to the blade surface to melt the ice layer. Subsequently, the cooled heat transfer medium flows back to the first output pipe through the second output pipe and finally returns to the heating equipment for recirculation. By circulating the heat transfer medium between the heating equipment and the heat dissipation structure, the surface temperature of various parts of the blades can be quickly increased, achieving rapid de-icing; through the control of solenoid valves, multiple heat dissipation structures can supply heat to multiple heating zones separately, facilitating precise and centralized heating for high icing locations.

[0040] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A wind turbine blade de-icing heating device, characterized in that, include: Multiple heating zones are distributed along the length of the blade, and each of the multiple heating zones is provided with a heat dissipation structure. A heat transfer medium flows inside the heat dissipation structure, and the multiple heat dissipation structures are respectively connected to a heating device, which is used to heat the heat transfer medium. The heat dissipation structure includes a first input pipe and a first output pipe connected to the heating equipment. A second input pipe and a second output pipe are provided between the first input pipe and the first output pipe. The second input pipe is connected to the first input pipe, and the second output pipe is connected to the first output pipe. A plurality of heat dissipation pipes are connected between the second input pipe and the second output pipe. The heat dissipation pipes are connected to the outer shell of the blade. Each of the first input pipes is equipped with a solenoid valve, and the solenoid valve is electrically connected to the controller.

2. The wind turbine blade de-icing heating device as described in claim 1, characterized in that, Both the second input pipe and the second output pipe are configured as ring structures.

3. The wind turbine blade de-icing heating device as described in claim 1, characterized in that, The heat dissipation structure further includes a plurality of first heat dissipation fins evenly distributed along the axis of the heat dissipation pipes. The first heat dissipation fins are fixedly connected to the plurality of heat dissipation pipes and fixedly connected to the outer shell of the blades.

4. The wind turbine blade de-icing heating device as described in claim 3, characterized in that, The first heat sink has a ring structure, and the shape of the first heat sink is consistent with the cross-sectional curve shape at the location of the blade.

5. The wind turbine blade de-icing heating device as described in claim 3, characterized in that, Multiple second heat sinks are provided between two adjacent heat dissipation structures. The first end of the second heat sink is fixedly connected to the second input pipe of one of the heat dissipation structures, and the second end of the second heat sink is fixedly connected to the second output pipe of the other heat dissipation structure. The second heat sink is fixedly connected to the outer shell of the blade.

6. The wind turbine blade de-icing heating device as described in claim 5, characterized in that, Both the first heat sink and the second heat sink are made of aluminum alloy.

7. The wind turbine blade de-icing heating device as described in claim 1, characterized in that, The cross-sectional area of ​​the heat dissipation pipe is smaller than the cross-sectional areas of the second input pipe and the second output pipe.

8. The wind turbine blade de-icing heating device as described in claim 1, characterized in that, The length of the plurality of heating zones gradually decreases from the leaf root to the leaf tip.

9. The wind turbine blade de-icing heating device as described in claim 1, characterized in that, The first input pipe and the first output pipe are made of titanium alloy, and an insulation layer is provided on the outside of the first input pipe and the first output pipe.

10. The wind turbine blade de-icing heating device as described in claim 1, characterized in that, The second input pipe, the second output pipe, and the heat dissipation pipe are structures made of aluminum alloy.

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