Deicing system and deicing method for blades of wind driven generator

Abstract

The invention discloses a wind driven generator blade deicing system and method, and relates to the technical field of wind power generation, the wind driven generator blade deicing system comprises fan blades, a generator cabin and a tower, the fan blades are fixedly connected to the peripheral side of a hub, the middle of the hub is connected with the generator cabin through a main shaft, and the lower end of the generator cabin is connected with the tower; an air heating box is arranged in the tower, air is heated through an electric heater, hot air is conveyed into fan blades, a soaking net is embedded in the fan blades, heat of the hot air is transferred to the soaking net through a heat conduction plate arranged in the fan blades to heat the fan blades, the temperature of the surfaces of the fan blades is evenly increased, and the heat conduction effect is improved. And meanwhile, hot air is blown to the surfaces of the fan blades from the annular air spraying pipes, the deicing efficiency is improved, heat generated when the generator works is absorbed through the heat exchanger, cold air is preheated, and the utilization efficiency of energy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a wind turbine blade deicing system and a deicing method. Background Art

[0002] With the development of society, people's demand for energy is getting bigger and bigger. Compared with the pollution problems caused by fossil energy, clean energy is pollution-free. Therefore, the demand for clean energy is also increasing. Vigorously developing clean energy and developing energy-saving technologies has become a trend in today's society. Wind energy, as a pollution-free renewable energy, has become the object of vigorous development in the energy industry, such as wind power generation and wind heating.

[0003] Wind turbines are usually installed in places with abundant wind energy resources. Some wind turbines installed in cold areas have blades that freeze in winter. Blade freezing will lead to a decrease in power generation. The ice on the blades will also change the aerodynamic performance of the blades, resulting in aerodynamic and mass imbalance of the impeller, which in turn affects the overall performance and life of the wind turbine and has great harm to the generator. Therefore, deicing measures need to be taken when the blades freeze in winter. Existing deicing measures include electric heating, hot water circulation, mechanical deicing, and vibration deicing. Mechanical deicing or vibration deicing has the risk of damaging the blades. Electric heating or hot water circulation requires laying resistance wires or pipelines inside the blades, which increases the manufacturing cost of the blades and the risk of failure, and increases the difficulty of maintenance. Therefore, a wind turbine blade deicing system and deicing method are proposed, which heats the air to generate hot air to circulate inside the blades to increase the blade temperature for deicing. Summary of the invention

[0004] In order to solve the above technical problems, a wind turbine blade deicing system and deicing method are provided. This technical solution blows heated air to the inside of the blade to increase the blade temperature, and cooperates with external blowing equipment to spray hot air on the blade surface to quickly de-ice.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A wind turbine blade deicing system comprises a fan blade, a generator cabin and a tower, wherein a plurality of the fan blades are fixedly connected to the peripheral side of a hub, a middle portion of the hub is connected to the generator cabin through a main shaft, and a lower end of the generator cabin is connected to the tower;

[0007] The fan blades include:

[0008] A heat-distributing net, wherein the heat-distributing net is embedded in the inner wall of the fan blade;

[0009] A central partition, the central partition is arranged inside the fan blades and is fixedly connected to the fan blades, an air inlet channel is formed between the lower end of the central partition and the fan blades, an air outlet channel is formed between the upper end of the central partition and the fan blades, a plurality of heat conducting plates are arranged inside the air inlet channel and the air outlet channel, and the heat conducting plates are fixedly connected to the heat equalizing network;

[0010] The tower comprises:

[0011] A cold air inlet pipe, the cold air inlet pipe is in communication with the side wall of the tower, and a first blower is installed at one end of the cold air inlet pipe extending into the interior of the tower, the first blower is used to draw cold air into the cold air inlet pipe;

[0012] An air heating box, the air heating box is installed inside the tower, a first electric heater is installed inside the air heating box, a second electric heater is installed on the upper end of the first electric heater, and multiple layers of heating nets consisting of electric heating wires are arranged inside the first electric heater and the second electric heater;

[0013] The second blower is installed on the top of the air heating box and is used to blow out the hot air heated by the first electric heater and the second electric heater through the pipeline.

[0014] Preferably, the generator compartment comprises:

[0015] A generator, wherein an input end of the generator is connected to a coupler;

[0016] A heat exchanger, the heat exchanger is installed on one side of the generator, the heat exchanger absorbs the heat generated when the generator is running, and the heat exchanger is connected to the coolant delivery pipe;

[0017] A speed-increasing gearbox, the right end of which is rotatably connected to the main shaft, the main shaft drives the multiple gears inside the speed-increasing gearbox to rotate and increase the speed of the output end of the speed-increasing gearbox, and the output end of the speed-increasing gearbox is fixedly connected to the coupler;

[0018] A brake mechanism, which is arranged on the right side of the speed increasing gearbox and is used to brake and lock the main shaft;

[0019] An air pipe connector, wherein the air pipe connector is fixedly connected to the side wall of the generator compartment, and the middle portion of the air pipe connector is rotatably connected to the main shaft;

[0020] The speed increasing gearbox also includes a motor for driving the internal gears of the speed increasing gearbox and the main shaft to rotate.

[0021] Preferably, a heat exchanger is connected between the air heating box and the first blower, and one side of the heat exchanger is connected to the coolant delivery pipe. The heat of the generator is transported to the top of the first blower through the heat exchanger and the coolant delivery pipe, and the cold air extracted by the first blower is heated after passing through the heat exchanger.

[0022] Preferably, the upper end of the air heating box is connected to a first air outlet duct, a duct connector is installed on the surface of the first air outlet duct, the other end of the first air outlet duct is connected to the duct connector, and the lower end of the air heating box is connected to a return air duct, the other end of the return air duct is connected to the duct connector.

[0023] Preferably, a filter is fixedly connected to the left opening of the cold air inlet duct.

[0024] Preferably, the top of the air heating box is connected to a second air outlet pipe, the other end of the second air outlet pipe passes through the outside of the tower and is connected to an annular jet pipe, the annular jet pipe is arranged in a ring shape and has a plurality of jet holes on its inner side, a movable frame is connected to the left side of the annular jet pipe, the left end of the movable frame is slidably connected to a slide rail, a driving motor is installed above the movable frame, and the driving motor drives the movable frame to reciprocate along the slide rail.

[0025] Preferably, an air inlet blower is installed inside the air inlet channel, and an air outlet blower is installed inside the central partition. The air inlet blower and the air outlet blower are arranged in opposite directions. A plurality of air duct partitions are arranged inside the air inlet channel and the air outlet channel. The air inlet channel and the air outlet channel are divided into a plurality of air ducts by the air duct partitions.

[0026] Preferably, the trachea connector comprises:

[0027] A hot air duct interface, the hot air duct interface is connected to the first air outlet duct, the first air outlet duct is connected to the hot air chamber inside the air duct connector through the hot air duct interface, the hot air chamber is annularly arranged, the hot air chamber is connected to a plurality of air inlet connecting pipes provided on the wheel hub, and the other end of the air inlet connecting pipe is connected to the air inlet channel;

[0028] A return pipe interface, the return pipe interface is connected to the return air duct, the first air outlet duct is connected to the return air chamber inside the trachea connector through the return pipe interface, the return air chamber is arranged on the outside of the hot air chamber, the return air chamber is connected to multiple outlet connecting pipes opened on the wheel hub, and the other end of the outlet connecting pipe is connected to the air outlet channel.

[0029] Preferably, a plurality of temperature and humidity sensors are provided on the surface of the fan blades, and the temperature and humidity sensors are used to monitor the temperature and humidity on the fan blades and feed back the data to a processing terminal.

[0030] The present invention discloses a method for deicing blades of a wind turbine generator, which specifically comprises the following steps:

[0031] 1. The temperature and humidity sensors are used to monitor the surface temperature and humidity of the blades. The processing terminal receives the temperature and humidity data and analyzes whether there is an icing risk.

[0032] 2. When there is a risk of freezing, the first blower and the second blower are started to extract external air, and the first electric heater, the second electric heater and the heat exchanger are started to heat the extracted external air;

[0033] 3. The main shaft is braked and decelerated by the brake mechanism. At the same time, the coupler decouples the input end of the generator from the output end of the speed-increasing gearbox. The motor drives the gear set in the speed-increasing gearbox to rotate, driving the main shaft and the hub to rotate. When one of the fan blades rotates to the vertical downward position, the brake mechanism stops and locks the main shaft.

[0034] 4. Open the first solenoid valve, and the hot air enters the hot air chamber through the first air outlet pipe, and then enters the air inlet channel through the air inlet connecting pipe. Start the air inlet blower and the air outlet blower to drive the hot air to flow along the air inlet channel and the air outlet channel and heat the heat transfer plate. The heat transfer plate transfers the heat to the heat spreader, and the heat spreader heats up to de-ice the surface of the fan blades;

[0035] 5. Open the second solenoid valve, and the hot air flows through the second air outlet pipe to the annular jet pipe and is ejected. The annular jet pipe is located directly below the fan blades. The driving motor drives the mobile frame to move back and forth so that the hot air is sprayed onto the surface of the fan blades to perform deicing operations.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The present invention is provided with an air duct connector, and a hot air chamber and a return air chamber are arranged inside the air duct connector. The hot air from the first air outlet duct enters the hot air chamber, and then enters the fan blades through the air inlet connecting pipe. The hot air entering the fan blades flows to the return air chamber and enters the air heating box again from the return air duct for heating and utilization, thereby reducing energy waste. The air duct connector can be used to heat the inside of the fan blades when they rotate, which can not only de-ice the fan blades when they are frozen, but also reduce the risk of blade freezing when the fan is working.

[0038] 2. A heat-distributing net is embedded inside the fan blades of the present invention. The heat of the hot air is transferred to the heat-distributing net through the heat-conducting plate arranged inside the fan blades to heat the fan blades, so that the surface of the fan blades is heated evenly, thereby avoiding stress concentration caused by uneven temperature rise and causing damage to the fan blades.

[0039] 3. The present invention provides a heat exchanger to absorb the heat of the generator when it is working, and sends the heat to the bottom of the air heating box through a coolant delivery pipe to preheat the extracted cold air, thereby improving the energy utilization efficiency.

[0040] 4. The present invention is provided with a movable frame and an annular jet pipe outside the tower, and hot air is transported to the annular jet pipe for ejection through the second air outlet pipe. The movable frame is driven by a driving motor to move up and down along the slide rail, and the surface of the fan blades can be sprayed for de-icing, which can improve the de-icing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of the present invention;

[0042] Figure 2 Schematic diagram of the internal structure of the fan blade of the present invention;

[0043] Figure 3 It is a schematic cross-sectional structure diagram of a fan blade in the present invention;

[0044] Figure 4 It is a schematic diagram of the structure of the wheel hub and the trachea connector in the present invention;

[0045] Figure 5 It is a structural schematic diagram of the trachea connector in the present invention from another perspective.

[0046] The numbers in the figure are:

[0047] 1. Fan blades; 101. Hub; 1011. Air inlet connecting pipe; 1012. Air outlet connecting pipe; 11. Heat distribution network; 111. Heat conduction plate; 112. Temperature and humidity sensor; 12. Central partition; 13. Air inlet channel; 14. Air outlet channel; 15. Air inlet blower; 16. Air outlet blower; 17. Air duct partition;

[0048] 2. Generator compartment; 21. Generator; 211. Coupler; 22. Heat exchanger; 221. Coolant delivery pipe; 23. Speed ​​increasing gearbox; 24. Brake mechanism; 25. Main shaft; 26. Air pipe connector; 261. First air outlet pipe; 2611. Hot air pipe interface; 2612. Hot air chamber; 262. Return air pipe; 2621. Return pipe interface; 2622. Return air chamber; 27. First solenoid valve; 28. Second solenoid valve;

[0049] 3. Tower; 31. Cold air inlet pipe; 311. Filter; 32. First blower; 33. Air heating box; 331. First electric heater; 332. Second electric heater; 34. Second blower; 35. Second air outlet pipe; 36. Slide rail; 37. Moving frame; 371. Driving motor; 38. Annular jet pipe. DETAILED DESCRIPTION

[0050] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned throughout the specification and claims, "including" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of implementing the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be determined by the definition of the attached claims.

[0051] like Figure 1-3 As shown, a wind turbine blade deicing system includes fan blades 1, a generator cabin 2 and a tower 3. A plurality of fan blades 1 are fixedly connected to the circumferential side of a hub 101. The middle portion of the hub 101 is rotatably connected to the generator cabin 2 via a main shaft 25. The lower end of the generator cabin 2 is rotatably connected to the tower 3.

[0052] The fan blade 1 includes a heat-scaling net 11 and a central partition 12. The heat-scaling net 11 is embedded in the inner wall of the fan blade 1. The central partition 12 is arranged inside the fan blade 1 and is fixedly connected to the fan blade 1. An air inlet channel 13 is formed between the lower end of the central partition 12 and the fan blade 1. An air outlet channel 14 is formed between the upper end of the central partition 12 and the fan blade 1. A plurality of heat-conducting plates 111 are arranged inside the air inlet channel 13 and the air outlet channel 14. The heat-conducting plates 111 are fixedly connected to the heat-scaling net 11. The heat-conducting plates 111 are heated by blowing hot air into the air inlet channel 13 and the air outlet channel 14. The heat-conducting plates 111 conduct the heat to the heat-scaling net 11. The heat-scaling net 11 heats up to melt the ice on the surface of the fan blade 1 and falls off. The air inlet channel 13 An air inlet blower 15 is installed inside, and an air outlet blower 16 is installed inside the central partition 12. The blowing directions of the air inlet blower 15 and the air outlet blower 16 are opposite to each other. A plurality of air duct partitions 17 are arranged inside the air inlet channel 13 and the air outlet channel 14. The air inlet channel 13 and the air outlet channel 14 are separated into a plurality of air ducts by the air duct partitions 17. The air inlet blower 15 and the air outlet blower 16 drive the hot air blown into the air inlet channel 13 to flow to the air outlet channel 14 through the air inlet channel 13 to form a circulation. The air duct partitions 17 are used to separate the air ducts, so that the air flow is smoother, and the internal air flow direction is avoided to be turbulent so that some areas are not heated by the hot air flow. At the same time, the air duct partitions 17 also strengthen the structural strength of the fan blade 1.

[0053] The tower 3 includes a cold air inlet pipe 31, a second air outlet pipe 35 and a slide rail 36. The cold air inlet pipe 31 is connected to the side wall of the tower 3. The cold air inlet pipe 31 extends to one end of the tower 3 and is equipped with a first blower 32. A filter screen 311 is fixedly connected to the left opening of the cold air inlet pipe 31. The filter screen 311 is used to prevent foreign matter from entering the cold air inlet pipe 31. The first blower 32 is used to draw cold air into the cold air inlet pipe 31. The air heating box 33 is installed inside the tower 3. A first electric heater 331 is installed inside the air heating box 33. A second electric heater 332 is installed on the upper end of the first electric heater 331. The first electric heater 331 and the second electric heater 332 are both provided with multiple layers of heating nets composed of electric heating wires. The second blower 34 is installed on the top of the air heating box 33 and is used to blow out the hot air heated by the first electric heater 331 and the second electric heater 332 through a pipe.

[0054] like Figure 1 As shown, the generator compartment 2 includes a generator 21, a heat exchanger 22, a speed-increasing gearbox 23, a brake mechanism 24 and an air pipe connector 26. The input end of the generator 21 is connected with a coupler 211. The heat exchanger 22 is installed on one side of the generator 21. The heat exchanger 22 absorbs the heat generated when the generator 21 is running. The heat exchanger 22 is connected to the coolant delivery pipe 221. The right end of the speed-increasing gearbox 23 is rotatably connected to the main shaft 25. The main shaft 25 drives multiple gears inside the speed-increasing gearbox 23 to rotate and increase the speed of the output end of the speed-increasing gearbox 23. The output of the speed-increasing gearbox 23 The output end is fixedly connected to the coupler 211, and the speed increasing gearbox 23 also includes a motor for driving the internal gears of the speed increasing gearbox 23 and the main shaft 25 to rotate. The motor drives the internal gear set of the speed increasing gearbox 23 to rotate, thereby driving the main shaft 25 and the hub 101 to rotate, so that the position of the fan blades 1 can be adjusted to facilitate maintenance operations. The brake mechanism 24 is arranged on the right side of the speed increasing gearbox 23, and the brake mechanism 24 is used to brake and lock the main shaft 25. The air pipe connector 26 is fixedly connected to the side wall of the generator compartment 2, and the middle part of the air pipe connector 26 is rotatably connected to the main shaft 25.

[0055] It should be noted that a heat exchanger 22 is connected between the air heating box 33 and the first blower 32. One side of the heat exchanger 22 is connected to the coolant delivery pipe 221. The heat of the generator 21 is delivered to the top of the first blower 32 through the heat exchanger 22 and the coolant delivery pipe 221. The cold air extracted by the first blower 32 is heated after passing through the heat exchanger 22. The heat generated by the generator 21 is absorbed by the coolant, and the coolant that absorbs the heat is delivered to the inside of the heat exchanger 22 in the tower 3 through the coolant delivery pipe 221. The cold air is heated when passing through the heat exchanger 22, thereby avoiding the waste of heat generated during the operation of the generator 21 and improving the energy utilization efficiency.

[0056] The upper end of the air heating box 33 is connected to the first air outlet pipe 261, and the surface of the first air outlet pipe 261 is installed with an air pipe connector 26, which is used to control the switch of the first air outlet pipe 261. The other end of the first air outlet pipe 261 is connected to the air pipe connector 26, and the lower end of the air heating box 33 is connected to the return air pipe 262, and the other end of the return air pipe 262 is connected to the air pipe connector 26. The top of the air heating box 33 is connected to the second air outlet pipe 35, and the other end of the second air outlet pipe 35 passes through the tower 3. The outer side of the annular jet pipe 38 is connected to the annular jet pipe 38, which is arranged in an annular shape and has a plurality of jet holes on its inner side. A movable frame 37 is connected to the left side of the annular jet pipe 38, and the left end of the movable frame 37 is slidably connected to the slide rail 36. A driving motor 371 is installed above the movable frame 37, and the driving motor 371 drives the movable frame 37 to reciprocate along the slide rail 36. The hot air is blown out from the annular jet pipe 38 through the second air outlet pipe 35, and can be sprayed on the outer surface of the fan blade 1 to accelerate the melting speed of ice and snow at the tip of the fan blade 1.

[0057] Please refer to Figure 4 and 5 The trachea connector 26 includes a hot air duct interface 2611 and a return air duct interface 2621. The hot air duct interface 2611 is connected to the first air outlet duct 261, and the return air duct interface 2621 is connected to the return air duct 262. The first air outlet duct 261 is communicated with the hot air chamber 2612 inside the trachea connector 26 through the hot air duct interface 2611. The first air outlet duct 261 is communicated with the return air chamber 2622 inside the trachea connector 26 through the return air duct interface 2621. The hot air chamber 2612 and the return air chamber 2622 are both arranged in an annular manner, and the return air chamber 2622 is arranged on the outside of the hot air chamber 2612. The hot air chamber 2612 is communicated with a plurality of air inlet connecting pipes 1011 opened on the wheel hub 101. The other end of the air inlet connecting pipe 1011 is connected to The air inlet channel 13 is connected, and the return air chamber 2622 is connected to multiple air outlet connecting pipes 1012 opened on the wheel hub 101. The other end of the air outlet connecting pipe 1012 is connected to the air outlet channel 14. When the wheel hub 101 rotates, the hot air chamber 2612 is always connected to the air inlet connecting pipe 1011, and the return air chamber 2622 is always connected to the air outlet connecting pipe 1012. While the air inlet connecting pipe 1011 keeps rotating, the hot air can also enter the air inlet connecting pipe 1011 through the first air outlet pipe 261 and then enter the air inlet channel 13. At the same time, the heated return gas enters the first air outlet pipe 261 through the air outlet connecting pipe 1012 and the return pipe interface 2621 and is transported to the inside of the air heating box 33 for heating and recycling again, thereby avoiding heat loss.

[0058] Among them, a plurality of temperature and humidity sensors 112 are arranged on the surface of the fan blades 1. The temperature and humidity sensors 112 are used to monitor the temperature and humidity on the fan blades 1 and feed back the data to the processing terminal. The optional model of the temperature and humidity sensor 112 is: LZ12-HC2-IE102, or other sensors that can achieve the same function. The processing terminal determines whether there is an icing risk by analyzing the temperature and humidity data on the surface of the fan blades 1, and starts the relevant mechanism for de-icing when there is an icing risk.

[0059] In addition, the present invention also provides a deicing method for wind turbine blades, which specifically includes the following steps:

[0060] 1. The temperature and humidity sensors are used to monitor the surface temperature and humidity of the blades. The processing terminal receives the temperature and humidity data and analyzes whether there is an icing risk.

[0061] 2. When there is a risk of freezing, the first blower and the second blower are started to extract external air, and the first electric heater, the second electric heater and the heat exchanger are started to heat the extracted external air;

[0062] 3. The main shaft is braked and decelerated by the brake mechanism. At the same time, the coupler decouples the input end of the generator from the output end of the speed-increasing gearbox. The motor drives the gear set in the speed-increasing gearbox to rotate, driving the main shaft and the hub to rotate. When one of the fan blades rotates to the vertical downward position, the brake mechanism stops and locks the main shaft.

[0063] 4. Open the first solenoid valve, and the hot air enters the hot air chamber through the first air outlet pipe, and then enters the air inlet channel through the air inlet connecting pipe. Start the air inlet blower and the air outlet blower to drive the hot air to flow along the air inlet channel and the air outlet channel and heat the heat transfer plate. The heat transfer plate transfers the heat to the heat spreader, and the heat spreader heats up to de-ice the surface of the fan blades;

[0064] 5. Open the second solenoid valve, and the hot air flows through the second air outlet pipe to the annular jet pipe and is ejected. The annular jet pipe is located directly below the fan blades. The driving motor drives the mobile frame to move back and forth so that the hot air is sprayed onto the surface of the fan blades to perform deicing operations.

[0065] To summarize, the present invention extracts external cold air and heats it, and then transports the hot air to the inside of the fan blades 1 through a pipe to heat the fan blades 1. The surface of the fan blades 1 is evenly heated through the heat-distributing net 11 to avoid stress concentration caused by uneven temperature and damage to the fan blades 1. At the same time, the melting speed of ice and snow is accelerated by blowing hot air from the annular jet pipe 38 to the surface of the fan blades 1, thereby improving the de-icing efficiency.

[0066] Finally, it should be noted that when describing the position of each component and the matching relationship between them, the present invention usually takes one / a pair of components as an example. However, those skilled in the art should understand that such position, matching relationship, etc. are also applicable to other components / other pairs of components.

[0067] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. A wind turbine blade deicing system, characterized in that: It comprises fan blades (1), a generator cabin (2) and a tower (3), wherein a plurality of the fan blades (1) are fixedly connected to the circumference of a hub (101), the middle portion of the hub (101) is connected to the generator cabin (2) via a main shaft (25), and the lower end of the generator cabin (2) is connected to the tower (3); The fan blade (1) comprises: A heat-dissipating net (11), wherein the heat-dissipating net (11) is embedded inside the inner wall of the fan blade (1); A central partition (12), the central partition (12) being arranged inside the fan blade (1) and fixedly connected to the fan blade (1), an air inlet channel (13) being formed between the lower end of the central partition (12) and the fan blade (1), an air outlet channel (14) being formed between the upper end of the central partition (12) and the fan blade (1), a plurality of heat conducting plates (111) being arranged inside the air inlet channel (13) and the air outlet channel (14), and the heat conducting plates (111) being fixedly connected to the heat dissipating network (11); The tower (3) comprises: a cold air inlet pipe (31), the cold air inlet pipe (31) being in communication with a side wall of the tower (3), a first blower (32) being installed at one end of the cold air inlet pipe (31) extending into the interior of the tower (3), the first blower (32) being used to draw cold air into the interior of the cold air inlet pipe (31); An air heating box (33), the air heating box (33) being installed inside the tower (3), a first electric heater (331) being installed inside the air heating box (33), a second electric heater (332) being installed on the upper end of the first electric heater (331), and a plurality of layers of heating nets consisting of electric heating wires being arranged inside the first electric heater (331) and the second electric heater (332); The second blower (34) is installed on the top of the air heating box (33) and is used to blow out the hot air heated by the first electric heater (331) and the second electric heater (332) through the pipeline.

2. A wind turbine blade deicing system according to claim 1, characterized in that: The generator compartment (2) comprises: A generator (21), wherein an input end of the generator (21) is connected to a coupler (211); A heat exchanger (22), the heat exchanger (22) being installed on one side of the generator (21), the heat exchanger (22) absorbing heat generated when the generator (21) is running, and the heat exchanger (22) being in communication with a coolant delivery pipe (221); A speed-increasing gearbox (23), wherein the right end of the speed-increasing gearbox (23) is rotatably connected to a main shaft (25), the main shaft (25) drives a plurality of gears inside the speed-increasing gearbox (23) to rotate and increase the speed of an output end of the speed-increasing gearbox (23), and the output end of the speed-increasing gearbox (23) is fixedly connected to a coupler (211); A brake mechanism (24), the brake mechanism (24) being arranged on the right side of the speed increasing gear box (23), the brake mechanism (24) being used for braking and locking the main shaft (25); An air pipe connector (26), wherein the air pipe connector (26) is fixedly connected to the side wall of the generator compartment (2), and the middle portion of the air pipe connector (26) is rotatably connected to the main shaft (25); The speed increasing gearbox (23) also includes a motor for driving the internal gears of the speed increasing gearbox (23) and the main shaft (25) to rotate.

3. A wind turbine blade deicing system according to claim 1, characterized in that: A heat exchanger (22) is connected between the air heating box (33) and the first blower (32), and one side of the heat exchanger (22) is connected to a coolant delivery pipe (221). The heat of the generator (21) is delivered to the top of the first blower (32) through the heat exchanger (22) and the coolant delivery pipe (221), and the cold air extracted by the first blower (32) is heated after passing through the heat exchanger (22).

4. A wind turbine blade deicing system according to claim 1, characterized in that: The upper end of the air heating box (33) is connected to a first air outlet pipe (261), a duct connector (26) is installed on the surface of the first air outlet pipe (261), and the other end of the first air outlet pipe (261) is connected to the duct connector (26); the lower end of the air heating box (33) is connected to a return air pipe (262), and the other end of the return air pipe (262) is connected to the duct connector (26).

5. A wind turbine blade deicing system according to claim 1, characterized in that: A filter screen (311) is fixedly connected to the left opening of the cold air inlet pipe (31).

6. A wind turbine blade deicing system according to claim 1, characterized in that: The top of the air heating box (33) is connected to a second air outlet pipe (35), the other end of the second air outlet pipe (35) passes through the outside of the tower (3) and is connected to an annular jet pipe (38), the annular jet pipe (38) is arranged in an annular shape and has a plurality of jet holes on its inner side, the left side of the annular jet pipe (38) is connected to a movable frame (37), the left end of the movable frame (37) is slidably connected to a slide rail (36), a driving motor (371) is installed above the movable frame (37), and the driving motor (371) drives the movable frame (37) to reciprocate along the slide rail (36).

7. A wind turbine blade deicing system according to claim 1, characterized in that: An air inlet blower (15) is installed inside the air inlet channel (13), and an air outlet blower (16) is installed inside the central partition plate (12); the air inlet blower (15) and the air outlet blower (16) are arranged in opposite directions; a plurality of air duct partition plates (17) are arranged inside the air inlet channel (13) and the air outlet channel (14); and the air inlet channel (13) and the air outlet channel (14) are divided into a plurality of air ducts by the air duct partition plates (17).

8. A wind turbine blade deicing system according to claim 2, characterized in that: The trachea connector (26) comprises: A hot air pipe interface (2611), the hot air pipe interface (2611) is connected to a first air outlet pipe (261), the first air outlet pipe (261) is connected to a hot air chamber (2612) inside the air pipe connector (26) through the hot air pipe interface (2611), the hot air chamber (2612) is arranged in an annular shape, the hot air chamber (2612) is connected to a plurality of air inlet connecting pipes (1011) provided on the wheel hub (101), and the other end of the air inlet connecting pipe (1011) is connected to an air inlet channel (13); A return pipe interface (2621), the return pipe interface (2621) is connected to the return air pipe (262), the first air outlet pipe (261) is connected to the return air chamber (2622) inside the air pipe connector (26) through the return pipe interface (2621), the return air chamber (2622) is arranged on the outside of the hot air chamber (2612), the return air chamber (2622) is connected to a plurality of air outlet connecting pipes (1012) provided on the wheel hub (101), and the other end of the air outlet connecting pipe (1012) is connected to the air outlet channel (14).

9. A wind turbine blade deicing system according to claim 1, characterized in that: A plurality of temperature and humidity sensors (112) are arranged on the surface of the fan blade (1), and the temperature and humidity sensors (112) are used to monitor the temperature and humidity on the fan blade (1) and feed back the data to a processing terminal.

10. A method for deicing blades of a wind turbine, characterized in that: The deicing method is performed using the wind turbine blade deicing system as shown in claims 1 to 9, and specifically comprises the following steps:

1. The temperature and humidity sensors are used to monitor the surface temperature and humidity of the blades. The processing terminal receives the temperature and humidity data and analyzes whether there is an icing risk.

2. When there is a risk of freezing, the first blower and the second blower are started to extract external air, and the first electric heater, the second electric heater and the heat exchanger are started to heat the extracted external air; 3. The main shaft is braked and decelerated by the brake mechanism. At the same time, the coupler decouples the input end of the generator from the output end of the speed-increasing gearbox. The motor drives the gear set in the speed-increasing gearbox to rotate, driving the main shaft and the hub to rotate. When one of the fan blades rotates to the vertical downward position, the brake mechanism stops and locks the main shaft.

4. Open the first solenoid valve, and the hot air enters the hot air chamber through the first air outlet pipe, and then enters the air inlet channel through the air inlet connecting pipe. Start the air inlet blower and the air outlet blower to drive the hot air to flow along the air inlet channel and the air outlet channel and heat the heat transfer plate. The heat transfer plate transfers the heat to the heat spreader, and the heat spreader heats up to de-ice the surface of the fan blades; 5. Open the second solenoid valve, and the hot air flows through the second air outlet pipe to the annular jet pipe and is ejected. The annular jet pipe is located directly below the fan blades. The driving motor drives the mobile frame to move back and forth so that the hot air is sprayed onto the surface of the fan blades to perform deicing operations.

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