Deicing system and method for wind power blade

Abstract

The invention belongs to the technical field of wind turbine blade ice prevention and removal, and discloses a deicing system and method for a wind turbine blade, and the deicing system comprises an electric heating deicing subsystem and a gas heating deicing subsystem; the electric heating deicing subsystem is used for heating and deicing the blade front edge of the wind power blade in an electric heating mode; the gas heat deicing subsystem is used for heating and deicing a blade tip area of the wind power blade by using heat source gas; the electric heating deicing subsystem comprises an electric heating film; the electrothermal film covers a blade front edge preset area of the wind power blade; the gas heat deicing subsystem comprises a hot air source and a hot air conveying pipeline; the hot air source is arranged at the blade root part of the wind power blade; an inlet of the hot air conveying pipeline is connected with an outlet of the hot air source, and an outlet of the hot air conveying pipeline extends to the tail end of a cavity in a blade tip of the wind power blade; according to the invention, regional directional heating and deicing of the wind power blade are realized, so that a high-efficiency, low-power and full-coverage deicing target is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbine blade anti-icing and deicing, and in particular relates to a deicing system and method for wind turbine blades. Background Art

[0002] In the field of wind power generation, wind turbine blades are the core components for capturing wind energy, and their operating status directly affects the efficiency and safety of power generation. However, under extreme winter climatic conditions, the harsh environment of low temperature, high humidity and high wind speed makes wind turbine blades extremely prone to icing. Icing of wind turbine blades will lead to a significant decrease in starting performance, causing imbalance problems of wind turbine blades, which in turn will cause a significant reduction in power generation efficiency and may even induce safety accidents, posing a huge challenge to the stable operation of wind farms.

[0003] At present, the de-icing problem of vibrating wind turbine blades is mostly solved by using hydrophobic coating technology and electrothermal de-icing technology. However, the existing wind turbine blade de-icing technology is difficult to function stably in the long term and cannot achieve comprehensive and effective de-icing. Specifically, Existing hydrophobic coating technology achieves anti-icing purposes by coating the blade surface with special materials to make it difficult for water droplets to adhere. However, this coating is prone to aging, has a short anti-icing cycle, and has poor environmental tolerance, making it difficult to function stably and long-term in complex and changeable natural environments. In addition, due to the complex structure of the blade tip, the electric heating film in the existing electric thermal de-icing technology is difficult to fit. At the same time, considering the requirements for lightning protection, the electric heating film cannot be deployed at the blade tip, resulting in obvious heating blind spots in the blade tip area, making comprehensive and effective de-icing impossible. Summary of the Invention

[0004] In response to the technical problems existing in the prior art, the present invention provides a deicing system and method for wind turbine blades to solve the technical problem that the existing deicing technology fails to achieve a good balance in power consumption control, lightweight structure, and comprehensive deicing range.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: The present invention provides a deicing system for wind turbine blades, comprising an electric deicing subsystem and a gas-heating deicing subsystem; the electric deicing subsystem is used to heat and de-ice the leading edge of the wind turbine blade using electric heating; the gas-heating deicing subsystem is used to heat and de-ice the tip area of ​​the wind turbine blade using heat source gas; The electric heating deicing subsystem includes an electric heating film; the electric heating film is covered on a preset area of ​​the leading edge of the wind turbine blade; The gas-heat deicing subsystem includes a hot air source and a hot air delivery pipe; the hot air source is arranged at the root of the wind turbine blade; the inlet of the hot air delivery pipe is connected to the outlet of the hot air source, and the outlet of the hot air delivery pipe extends to the end of the internal cavity of the blade tip of the wind turbine blade.

[0006] Furthermore, the electric heating film is made of carbon fiber cloth, carbon nanotube film or graphene heating film.

[0007] Furthermore, the electric deicing subsystem also includes a power supply, wires and a thermostat; The power supply and the temperature controller are both arranged at the root of the wind turbine blade. The output end of the power supply is connected to the power supply end of the electric heating film through the wire; the output end of the thermostat is connected to the control end of the power supply. The thermostat is used to collect the surface temperature of the electric heating film and adjust the output power of the power supply based on the collected surface temperature of the electric heating film.

[0008] Furthermore, the gas-heat deicing subsystem further includes a heat flow regulating valve and a flow rate monitoring device; The heat flow regulating valve is provided at the connection between the hot air source and the inlet of the hot gas delivery pipe, and is used to regulate the flow rate of the heat source gas entering the hot gas delivery pipe; The flow rate monitoring device is arranged at the middle part and the outlet of the hot gas conveying pipeline, and is used to collect the flow rate of the heat source gas in the hot gas conveying pipeline.

[0009] Furthermore, it also includes a control subsystem; the control subsystem is used to jointly control the electric heating deicing subsystem and the gas heating deicing subsystem; The control subsystem includes an ice layer sensor, a temperature and humidity sensor, a wind speed sensor and a controller; The ice layer sensor is arranged on the leading edge surface of the wind turbine blade to monitor the thickness of the ice layer on the leading edge surface of the wind turbine blade; the temperature and humidity sensor is arranged on the root surface of the wind turbine blade to collect the ambient temperature and humidity around the wind turbine blade; the wind speed sensor is arranged on the top of the nacelle of the wind turbine generator set to collect the ambient wind speed around the wind turbine blade; The output ends of the flow rate monitoring device, the ice layer sensor, the temperature and humidity sensor, and the wind speed sensor are all connected to the input end of the controller, and the output end of the controller is connected to the control end of the power supply, the heat flow regulating valve, and the control end of the hot air source.

[0010] Furthermore, the hot air source is a hot air blower, which is used to output hot air with a temperature of 80-120°C.

[0011] Furthermore, the hot gas delivery pipe is laid on the inner side of the blade web or trailing edge beam of the wind turbine blade, and extends from the blade root of the wind turbine blade to the end of the inner cavity of the blade tip of the wind turbine blade.

[0012] Furthermore, the hot gas delivery pipe adopts a high-temperature silicone tube or a composite pressure-resistant nylon tube, and an insulation layer is provided on the outer tube wall of the high-temperature silicone tube or the composite pressure-resistant nylon tube; Among them, a conical air outlet structure is provided at the outlet of the hot air conveying pipe, and the conical air outlet structure includes a support ring, an expansion joint and a dovetail bionic nozzle; one end of the support ring is connected to the outlet end of the hot air conveying pipe, the other end of the support ring is connected to one end of the expansion joint, the other end of the expansion joint is connected to the small mouth end of the dovetail bionic nozzle, and the large mouth end of the dovetail bionic nozzle extends toward the tip of the wind turbine blade; a number of diversion holes are evenly arranged on the surface of the dovetail bionic nozzle.

[0013] Furthermore, the diameter of the hot gas conveying pipe is 5-10 cm; the aperture of the diversion hole is 0.5-1.5 mm, and the injection angle of the diversion hole is 5°.

[0014] The present invention also provides a deicing method for wind turbine blades, utilizing the deicing system for wind turbine blades; The deicing method for wind turbine blades comprises: The electric heating deicing subsystem is used to heat and de-ice the leading edge of the wind turbine blades by means of electric heating. The gas-heat deicing subsystem uses the heating method of the heat source gas to heat and de-ice the tip area of ​​the wind turbine blade.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The deicing system and method for wind turbine blades provided by the present invention utilize electric heating to heat and de-ice the leading edge of the wind turbine blades through an electric deicing subsystem, and utilize heat source gas to heat and de-ice the tip area of ​​the wind turbine blades through a gas-heating deicing subsystem, thereby realizing regional directional heating and de-icing of the wind turbine blades, thereby achieving the goal of high-efficiency, low-power, and full-coverage deicing; specifically, utilizing the electric deicing subsystem to heat the leading edge area of ​​the blades can heat and de-ice quickly and accurately, thereby reducing unnecessary energy consumption; utilizing the gas-heating deicing subsystem to heat the tip area of ​​the blades, Hot air is generated by a hot air source and transported to the end of the internal cavity of the blade tip through a hot air transmission pipe for heating and de-icing; this effectively avoids energy waste, effectively controls the overall energy consumption of the system, and improves the energy efficiency ratio; secondly, the electric heating de-icing subsystem only needs to cover the leading edge of the blade with an electric heating film, and the structure is simple and light; in the gas heating de-icing subsystem, the hot air source is set at the root of the blade, reducing the additional weight on the blade; the overall design of the system effectively reduces the weight of the system and reduces the structural complexity while achieving efficient de-icing, which is conducive to improving the operating reliability and service life of wind turbine blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 This is a structural block diagram of a deicing system for wind turbine blades according to an embodiment; Figure 2 Schematic diagram of the distribution position of the electric heating film and the hot air delivery pipe in the embodiment; Figure 3 Schematic diagram of the structure of the conical air outlet structure in the embodiment.

[0018] Among them, 100 is the electric heating de-icing subsystem, 200 is the gas heating de-icing subsystem, 300 is the control subsystem, 400 is the wind turbine blade; 101 is the electric heating film; 201 is the hot air transmission pipeline, 202 is the support ring, 203 is the expansion joint, 204 is the swallowtail bionic nozzle, and 205 is the diversion hole. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions, and beneficial effects solved by this application more clearly understood, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application; it is obvious that the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of this application.

[0020] The present invention provides a deicing system for wind turbine blades, comprising an electric deicing subsystem 100 and a gas-heating deicing subsystem 200; the electric deicing subsystem 100 is used to heat and de-ice the leading edge of a wind turbine blade 400 using electric heating; the gas-heating deicing subsystem 200 is used to heat and de-ice the tip area of ​​the wind turbine blade 400 using heat source gas.

[0021] The electric deicing subsystem 100 includes an electric heating film 101; the electric heating film 101 is covered on a preset area of ​​the leading edge of the wind turbine blade 400; the gas-heating deicing subsystem 200 includes a hot air source and a hot air delivery pipe 201; the hot air source is arranged at the root of the wind turbine blade 400; the inlet of the hot air delivery pipe 201 is connected to the outlet of the hot air source, and the outlet of the hot air delivery pipe 201 extends to the end of the internal cavity of the blade tip of the wind turbine blade 400.

[0022] The deicing system for wind turbine blades described in the present invention, by providing an electric heating deicing subsystem, utilizes an electric heating film to heat the leading edge of the blade, thereby giving full play to the advantages of fast response and high efficiency of electric deicing; by providing a gas heating deicing subsystem, utilizes a hot air source provided at the root of the blade to transport hot air to the blade tip through a hot air transmission pipe, thereby effectively improving the deicing effect, reducing the energy consumption of the entire machine, and meeting the requirements of efficient, stable and low-energy deicing for wind turbine blades under complex climatic conditions, and having important practical value.

[0023] The following further explains the deicing system for wind turbine blades provided by the present invention with reference to some specific embodiments: Example As attached Figure 1-2 As shown, this embodiment provides a deicing system for wind turbine blades, including an electric deicing subsystem 100, a gas-heating deicing subsystem 200 and a control subsystem 300; the electric deicing subsystem 100 is used to heat and de-ice the leading edge of a wind turbine blade 400 by electric heating; the gas-heating deicing subsystem 200 is used to heat and de-ice the tip area of ​​the wind turbine blade 400 by using heat source gas.

[0024] The electric heating de-icing subsystem 100 includes an electric heating film 101, a power supply, wires, and a thermostat. The electric heating film 101 is covered on a predetermined area of ​​the leading edge of the wind turbine blade 400 and is used to heat and de-ice the predetermined area of ​​the leading edge of the wind turbine blade 400 by electric heating. Preferably, the covering range of the electric heating film 101 is specifically as follows: in the axial direction of the wind turbine blade 400, from the blade root to the blade tip, with the blade root as the starting point, extending 10%-80% of the axial length of the blade; in the chord length direction of the wind turbine blade 400, with the blade leading edge mold seam as the center and extending 30%-80% of the blade chord length in the direction away from the blade leading edge mold seam. The electric heating film 101 is made of a material with excellent conductive properties and flexibility and conformability, such as carbon fiber cloth, carbon nanotube film, or graphene heating film. The sheet resistance of the electric heating film 101 is less than 0.5Ω / sq, ensuring heating uniformity of the electric heating film 101.

[0025] The power supply and the temperature controller are both arranged at the root of the wind turbine blade 400, the output end of the power supply is connected to the power supply end of the electric heating film 101 through the wire, and the output end of the temperature controller is connected to the control end of the power supply; wherein, the temperature controller is used to collect the surface temperature of the electric heating film 101 and adjust the output power of the power supply based on the collected surface temperature of the electric heating film 101; wherein, the control end of the power supply is also connected to the output end of the control subsystem 300, so as to use the control subsystem 300 to automatically control the power supply on and off.

[0026] It should be noted that, in the electrothermal film, the copper foil electrodes preset at both ends are used as its power supply ends; wherein, the preset copper foil electrodes are set in an embedded or attached manner to achieve the purpose of closely fitting the outer surface of the wind turbine blade 400; the wire is routed inside the wind turbine blade 400 to connect from the power supply end of the electrothermal film 101 to the root of the wind turbine blade 400; specifically, one end of the wire is connected to the output end of the power supply, and the other end of the wire extends along the axial internal cavity of the wind turbine blade 400, in a direction away from the root of the blade and passes through a preset wire through-hole to be connected to the copper foil electrode preset on the electrothermal film 101; wherein, the preset wire through-hole is set on the surface of the wind turbine blade 400, and is located near the root of the wind turbine blade 400 and at a distance of 5-10 mm from the edge of the electrothermal film 101.

[0027] The gas-heat deicing subsystem 200 includes a hot air source, a hot air delivery pipe 201 , a heat flow regulating valve, a flow rate monitoring device and a conical air outlet structure.

[0028] The hot air source is provided at the root of the wind turbine blade 400 and is used to output hot air with a temperature of 80-120° C.; that is, the temperature of the heat source gas is 80-120° C.; preferably, the hot air source is a hot air blower.

[0029] The hot air delivery pipe 201 is laid on the inner side of the blade web or trailing edge beam of the wind turbine blade 400, and extends from the blade root of the wind turbine blade 400 to the end of the internal cavity of the blade tip of the wind turbine blade 400; wherein, the inlet of the hot air delivery pipe 201 is connected to the outlet of the hot air source, and the outlet of the hot air delivery pipe 201 extends to the end of the internal cavity of the blade tip of the wind turbine blade 400; preferably, the hot air delivery pipe 201 adopts a high-temperature silicone tube or a composite pressure-resistant nylon tube, and an insulation layer is provided on the outer tube wall of the high-temperature silicone tube or the composite pressure-resistant nylon tube. By providing the insulation layer, the thermal insulation performance of the hot air delivery pipe 201 can be effectively improved, thereby improving the efficiency of the hot air delivery pipe 201 in transporting the heat source gas and reducing heat loss, thereby ensuring the heating and deicing efficiency of the gas-heat deicing subsystem 200; further preferably, the diameter of the hot air delivery pipe 201 is 5-10 cm.

[0030] The heat flow regulating valve is arranged at the connection between the hot air source and the inlet of the hot gas delivery pipe 201, and is used to regulate the flow rate of the heat source gas entering the hot gas delivery pipe 201; wherein, the input end of the heat flow regulating valve is connected to the output end of the control subsystem 300, so as to adjust the opening or closing of the heat flow regulating valve through the control subsystem 300; the flow rate monitoring device is arranged in the middle and outlet of the hot gas delivery pipe 201, and is used to collect the flow rate of the heat source gas in the hot gas delivery pipe 201; wherein, the output end of the flow rate monitoring device is connected to the input end of the control subsystem 300, and is used to input the collected flow rate of the heat source gas in the hot gas delivery pipe 201 into the control subsystem 300, so as to be used in the control decision process of the control subsystem 300.

[0031] The conical air outlet structure is arranged at the end of the internal cavity of the blade tip of the wind turbine blade 400 and is installed at the outlet of the hot air delivery pipe 201; wherein, the conical air outlet structure is used to form a vortex heating area at the end of the internal cavity of the blade tip of the wind turbine blade 400, so as to heat and de-ice the preset area of ​​the blade tip of the wind turbine blade 400; preferably, the preset area of ​​the blade tip of the wind turbine blade 400 is the range 5m in front of the blade tip of the wind turbine blade 400.

[0032] As attached Figure 3As shown, the conical air outlet structure includes a support ring 202, a telescopic joint 203 and a dovetail bionic nozzle 204 connected in sequence; one end of the support ring 202 is connected to the outlet end of the hot air delivery pipe 201, the other end of the support ring 202 is connected to one end of the telescopic joint 203, the other end of the telescopic joint 203 is connected to the small end of the dovetail bionic nozzle 204, and the large end of the dovetail bionic nozzle 204 extends toward the tip of the wind turbine blade 400; specifically, the support ring 202 is made of shape memory alloy; the dovetail bionic nozzle 204 is a hollow cone with two ends open. shaped structure, a plurality of diverter holes 205 are evenly arranged on the surface of the dovetail bionic nozzle 204; wherein, the plurality of diverter holes 205 are evenly distributed along the circumferential direction of the dovetail bionic nozzle 204, and 8-16 diverter holes 205 are distributed on each circumferential end face of the dovetail bionic nozzle 204, and each of the diverter holes 205 are arranged along the radial direction of the dovetail bionic nozzle 204 to improve the coverage rate of the heat source gas in the tip area of ​​the wind turbine blade 400; preferably, the aperture of the diverter hole 205 is 0.5-1.5 mm, and the injection angle of the diverter hole 205 is 5°.

[0033] The control subsystem 300 includes an ice layer sensor, a temperature and humidity sensor, a wind speed sensor and a controller; the ice layer sensor is arranged on the leading edge surface of the wind turbine blade 400, the temperature and humidity sensor is arranged on the root surface of the wind turbine blade 400, and the wind speed sensor is arranged on the top of the nacelle of the wind turbine generator set; the output ends of the flow rate monitoring device, the ice layer sensor, the temperature and humidity sensor and the wind speed sensor are all connected to the input end of the controller, and the output end of the controller is all connected to the control end of the power supply, the heat flow regulating valve and the control end of the hot air source.

[0034] The ice layer sensor is used to monitor the thickness of the ice layer on the leading edge surface of the wind turbine blade 400, the temperature and humidity sensor is used to collect the ambient temperature and humidity around the wind turbine blade 400, and the wind speed sensor is used to collect the ambient wind speed around the wind turbine blade 400. The controller is used to control the flow rate of the heat flow regulating valve, the switching on and off of the power supply, and the switching on and off of the hot air source based on the collected flow rate of the heat source gas in the hot gas transmission pipeline 201, the thickness of the ice layer on the leading edge surface of the wind turbine blade 400, the ambient temperature and humidity around the wind turbine blade 400, and the ambient wind speed around the wind turbine blade 400. It should be noted that the wind speed sensor can be a wind speed sensor provided on the wind turbine generator set itself.

[0035] Optionally, the control subsystem also includes an early warning module, the input end of the early warning module is connected to the output end of the controller; wherein, the controller is also used to generate and send an early warning instruction to the early warning module based on the ambient temperature and humidity around the wind turbine blade 400 and the ambient wind speed around the wind turbine blade 400; the early warning module is used to generate a wind turbine blade icing early warning signal in response to the early warning instruction.

[0036] The working principle and de-icing method are as follows: When deicing a wind turbine blade using the deicing system, the electric heating deicing subsystem 100 is used to heat and de-ice the leading edge of the wind turbine blade 400 using electric heating; and the gas heating deicing subsystem 200 is used to heat and de-ice the tip area of ​​the wind turbine blade 400 using heat source gas.

[0037] Specifically, the deicing system for wind turbine blades according to the present invention operates as follows: First, based on the ambient temperature and humidity around the wind turbine blade 400 and the ambient wind speed around the wind turbine blade 400, it is determined whether there is a risk of blade icing; specifically, when the temperature around the wind turbine blade 400 is lower than 0°C, the humidity is higher than 85% and the wind speed is greater than a preset threshold, it is determined that the wind turbine blade 400 will be at risk of icing; at this time, the controller generates and sends an early warning instruction to the early warning module, and the early warning module generates a wind turbine blade icing early warning signal in response to the early warning instruction.

[0038] Next, the ice layer sensor is used to monitor and transmit the ice layer thickness on the leading edge surface of the wind turbine blade 400 to the controller; the controller compares the ice layer thickness on the leading edge surface of the wind turbine blade 400 with a preset ice layer thickness threshold to determine whether ice has formed on the leading edge of the wind turbine blade 400; if so, the controller controls the power supply to be turned on and uses the electrothermal film 101 to heat and de-ice the leading edge of the wind turbine blade 400; at the same time, the controller controls the hot air source to be turned on and transmits the hot air output by the hot air source to the blade tip area through the hot air transmission pipe 201 to heat and de-ice the blade tip area of ​​the wind turbine blade 400; the controller adjusts the flow rate of the heat flow regulating valve, the on-off time of the power supply, and the on-off time of the hot air source according to the flow rate of the heat source gas in the hot air transmission pipe 201, the ice layer thickness on the leading edge surface of the wind turbine blade 400, the ambient temperature and humidity around the wind turbine blade 400, and the ambient wind speed around the wind turbine blade 400 until the ice layer is completely removed.

[0039] The deicing system and method for wind turbine blades described in the present invention, taking into account the icing characteristics of different areas of wind turbine blades, adopts a deicing method that combines electric heating and gas heating, with electric heating deicing as the main method and gas heating deicing as the auxiliary method. While ensuring the safety and lightweight of the blade structure, it effectively improves the deicing efficiency and coverage range.

[0040] In the present invention, electric heating film is used for heating the leading edge of the blade, and internally transported heat source gas is used for heating the tip area; since the tip of the wind turbine blade has the risk of lightning strike and complex structure, the use of gas heating is limited to the tip area to avoid high energy consumption caused by large-scale air supply, and at the same time reduce the risk of lightning strike on the tip of the blade; the gas heating components are only locally provided, which effectively reduces the weight burden and does not affect the balance and aerodynamic performance of the blade; in the present invention, full coverage deicing of the leading edge and tip of the blade is achieved, the deicing effect is more thorough, and efficiency and economy are taken into account; by arranging a conical air outlet structure at the outlet end of the hot air delivery duct, the hot air diffusion efficiency and spatial adaptability are greatly improved; by setting a control subsystem, on-demand startup, zoned heating and closed-loop regulation are supported, which significantly improves the system's deicing efficiency, energy efficiency level and structural adaptability.

[0041] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention.

Claims

1. A deicing system for wind turbine blades, characterized in that: It comprises an electric heating deicing subsystem (100) and a gas heating deicing subsystem (200); the electric heating deicing subsystem (100) is used to heat and de-ice the leading edge of a wind turbine blade (400) by means of electric heating; The gas-heat deicing subsystem (200) is used to heat and de-ice the tip region of the wind turbine blade (400) using heat source gas; The electric heating deicing subsystem (100) comprises an electric heating film (101); the electric heating film (101) is covered on a preset area of ​​the leading edge of a wind turbine blade (400); The gas-heat deicing subsystem (200) comprises a hot air source and a hot air delivery pipe (201); the hot air source is arranged at the blade root of the wind turbine blade (400); the inlet of the hot air delivery pipe (201) is connected to the outlet of the hot air source, and the outlet of the hot air delivery pipe (201) extends to the end of the internal cavity of the blade tip of the wind turbine blade (400).

2. A deicing system for wind turbine blades according to claim 1, characterized in that: The electric heating film (101) is made of carbon fiber cloth, carbon nanotube film or graphene heating film.

3. The deicing system for wind turbine blades according to claim 1, characterized in that: The electric heating deicing subsystem (100) also includes a power supply, a wire and a temperature controller; The power supply and the temperature controller are both arranged at the root of the wind turbine blade (400); the output end of the power supply is connected to the power supply end of the electric heating film (101) via the wire; the output end of the temperature controller is connected to the control end of the power supply; the temperature controller is used to collect the surface temperature of the electric heating film (101) and adjust the output power of the power supply based on the collected surface temperature of the electric heating film (101).

4. A deicing system for wind turbine blades according to claim 3, characterized in that: The gas-heat deicing subsystem (200) further includes a heat flow regulating valve and a flow rate monitoring device; The heat flow regulating valve is provided at the connection between the hot air source and the inlet of the hot gas delivery pipe (201), and the heat flow regulating valve is used to regulate the flow rate of the heat source gas entering the hot gas delivery pipe (201); The flow rate monitoring device is arranged at the middle and outlet of the hot gas delivery pipeline (201) and is used to collect the flow rate of the heat source gas in the hot gas delivery pipeline (201).

5. The deicing system for wind turbine blades according to claim 4, characterized in that: It also includes a control subsystem (300); the control subsystem (300) is used to jointly control the electric heating deicing subsystem (100) and the gas heating deicing subsystem (200); The control subsystem (300) includes an ice layer sensor, a temperature and humidity sensor, a wind speed sensor, and a controller; The ice layer sensor is arranged on the leading edge surface of the wind turbine blade (400) and is used to monitor the thickness of the ice layer on the leading edge surface of the wind turbine blade (400); the temperature and humidity sensor is arranged on the root surface of the wind turbine blade (400) and is used to collect the ambient temperature and humidity around the wind turbine blade (400); the wind speed sensor is arranged on the top of the nacelle of the wind turbine generator set and is used to collect the ambient wind speed around the wind turbine blade (400); The output ends of the flow rate monitoring device, the ice layer sensor, the temperature and humidity sensor, and the wind speed sensor are all connected to the input end of the controller, and the output end of the controller is connected to the control end of the power supply, the heat flow regulating valve, and the control end of the hot air source.

6. The deicing system for wind turbine blades according to claim 1, characterized in that: The hot air source is a hot air blower, and the hot air blower is used to output hot air with a temperature of 80-120°C.

7. The deicing system for wind turbine blades according to claim 1, characterized in that: The hot gas delivery pipe (201) is laid on the inner side of the blade web or trailing edge beam of the wind turbine blade (400), and extends from the blade root of the wind turbine blade (400) to the end of the internal cavity of the blade tip of the wind turbine blade (400).

8. The deicing system for wind turbine blades according to claim 1, characterized in that: The hot gas delivery pipe (201) adopts a high-temperature silicone tube or a composite pressure-resistant nylon tube, and an insulation layer is provided on the outer tube wall of the high-temperature silicone tube or the composite pressure-resistant nylon tube; The outlet of the hot air delivery pipe (201) is provided with a conical air outlet structure, and the conical air outlet structure comprises a support ring (202), an expansion joint (203) and a swallowtail bionic nozzle (204); one end of the support ring (202) is connected to the outlet end of the hot air delivery pipe (201), the other end of the support ring (202) is connected to one end of the expansion joint (203), the other end of the expansion joint (203) is connected to the small end of the swallowtail bionic nozzle (204), and the large end of the swallowtail bionic nozzle (204) extends toward the tip of the wind turbine blade (400); and a plurality of diversion holes (205) are evenly provided on the surface of the swallowtail bionic nozzle (204).

9. The deicing system for wind turbine blades according to claim 8, characterized in that: The diameter of the hot gas conveying pipe (201) is 5-10 cm; the aperture of the diversion hole (205) is 0.5-1.5 mm, and the injection angle of the diversion hole (205) is 5°.

10. A deicing method for wind turbine blades, characterized in that: Utilizing the deicing system for wind turbine blades according to any one of claims 1 to 9; The deicing method for wind turbine blades comprises: The electric heating deicing subsystem (100) is used to heat and de-ice the leading edge of the wind turbine blade (400) by means of electric heating; The gas-heat deicing subsystem (200) utilizes the heating method of the heat source gas to heat and de-ice the tip area of ​​the wind turbine blade (400).

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