Steam heat deicing device and deicing method for blades of wind driven generator

Abstract

The invention discloses a steam heat deicing device and method for blades of a wind driven generator, and relates to the technical field of wind power generation. The steam heat deicing device comprises a steam generation unit, a generator cabin and a deicing unit; hot steam generated by the steam generation unit is discharged through the deicing unit to conduct blowing deicing on the surfaces of the blades, a steam boiler and a steam-water separator are arranged in the steam generation unit, moisture in the hot steam generated by the steam boiler is removed through the steam-water separator, the separated water flows back to the water storage tank, the steam quality is improved, and the energy consumption is reduced. And the annular support in the deicing unit can move up and down along the moving guide rail, ice and snow on the surfaces of the fan blades can be more comprehensively removed, the deicing speed is higher, an air heater is arranged in the steam generation unit, air can be heated, hot air can be blown to the surfaces of the fan blades for deicing pretreatment, and the deicing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, in particular to a steam-heat deicing device and a deicing method for blades of a wind power generator. 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. The blades of wind turbines are attached by liquid generated by airflow, which is very easy to freeze and produce ice crystals, increasing the burden and danger of the equipment, thereby affecting the overall performance and life of the fan and causing great harm to the generator. The phenomenon of blade freezing in winter is more common in some wind turbines installed in cold areas. 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. Therefore, deicing measures need to be taken when the blades are frozen 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 increases the risk of failure, increasing the difficulty of maintenance. Therefore, a steam-heat deicing device for wind turbine blades is proposed. Hot steam is generated by heating water to spray the outside of the blades, quickly melting the ice and snow on the surface of the blades, and reducing the damage of ice to the generator blades. Summary of the invention

[0004] In order to solve the above technical problems, a steam-heat deicing device for wind turbine blades is provided. This technical solution generates hot steam by heating water to spray on the outside of the blades, quickly melting the ice and snow on the surface of the blades, reducing the damage of ice to the blades, and at the same time increasing power generation.

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

[0006] A steam-heat deicing device for blades of a wind turbine generator, comprising:

[0007] A steam generating unit, wherein the steam generating unit is arranged at one side of the tower and generates hot steam to de-ice the blades;

[0008] A generator cabin, which is installed at the upper end of the tower, and one end of the generator cabin is equipped with a plurality of fan blades;

[0009] A deicing unit, wherein the deicing unit is arranged at the lower end of the generator compartment, and the hot steam generated by the steam generating unit is discharged through the deicing unit to spray and de-ice the blade surface;

[0010] The steam generating unit comprises:

[0011] A water storage tank, the water storage tank is arranged inside the steam generating unit, and a water pump is installed at the upper end of the water storage tank;

[0012] A steam boiler, wherein the steam boiler is arranged at one side of the water storage tank, a plurality of electric heating pipes are arranged inside the steam boiler, the electric heating pipes are used to heat the water in the steam boiler, a pressure gauge is installed on the top of the steam boiler, the top of the steam boiler is connected to a steam discharge pipe, a steam-water separator is installed in the middle of the steam discharge pipe, and the steam-water separator is used to separate water from the steam discharged from the steam boiler;

[0013] A water pump, wherein an input end of the water pump is connected to a water pumping pipe, and one end of the water pumping pipe extends to the bottom of the water storage tank;

[0014] An air heater is arranged above the water tank, a plurality of electric heating nets are arranged inside the air heater, one end of the air heater is connected to a hot air exhaust pipe, a first-stage blower is installed inside the hot air exhaust pipe, a second-stage blower is arranged on one side of the first-stage blower, and external air is drawn into the air heater through the first-stage blower and the second-stage blower.

[0015] Preferably, the de-icing unit includes a mounting block, an annular bracket, a movable guide rail, a first drive motor and a second drive motor, the movable guide rail is mounted inside the tower, both ends of the mounting block are slidably connected to the movable guide rails, one side of the movable guide rail is fixedly connected to a rack, the first drive motor is mounted on one side of the mounting block and an output end thereof is fixedly connected to a driving gear, the driving gear is meshed with the rack, the first drive motor drives the mounting block to move up and down along the movable guide rail, the annular bracket is provided with two and one end of each is fixedly connected to a rotating gear, the rotating gears are meshed with each other, the rotating gears are all arranged inside the mounting block and are rotatably connected to the inner wall of the mounting block, the second drive motor is mounted on the lower end of the mounting block, and the output end of the second drive motor is fixedly connected to one of the rotating gears.

[0016] Preferably, the lower end of the water storage tank is connected to a liquid replenishing pipe, and the lower end of the steam boiler is connected to a drain pipe, and the drain pipe extends to the outside of the steam generating unit.

[0017] Preferably, the output end of the water pump is connected to a water pipe, the other end of the water pipe is connected to a steam boiler, a second solenoid valve is installed in the middle of the water pipe, and the steam exhaust pipe is located between the steam boiler and the steam-water separator and is installed with a first solenoid valve.

[0018] Preferably, the steam-water separator includes a shell, an inlet, an outlet, a reversing plate and a swirl reversing tube, the inlet and the outlet are respectively provided on both sides of the shell, the inlet and the outlet are both connected to the steam outlet pipe, the reversing plate is obliquely arranged inside the shell and fixedly connected to the inner wall of the shell, a swirl reversing tube is provided in the middle of the reversing plate, a spiral guide plate is fixedly connected to the circumference of the swirl reversing tube, a separator plate is provided below the swirl reversing tube, a gap is provided between the separator plate and the inner wall of the shell for the separated water to pass through, the lower end of the shell is connected to a reflux pipe, and the other end of the reflux pipe is connected to a water storage tank.

[0019] Preferably, a filter is provided at one end of the air heater, and the filter is used to filter external impurities.

[0020] Preferably, one end of the generator compartment is rotatably connected to a wheel hub, a plurality of fan blades are installed on the outer side of the wheel hub, an end of the wheel hub close to the generator compartment is fixedly connected to a brake disc, a first hydraulic column is installed at one end of the generator compartment through a connecting plate, a brake pad is fixedly connected to the output end of the first hydraulic column, and the first hydraulic column is extended to brake and decelerate the wheel hub.

[0021] Preferably, a plurality of positioning holes are provided on the circumferential side of the wheel hub, and the positioning holes are arranged corresponding to the fan blades. A second hydraulic column is provided at the lower end of the wheel hub, and the second hydraulic column is installed on one side of the generator compartment. A positioning block is fixedly connected to the output end of the second hydraulic column, and the positioning block is matched with the second hydraulic column. The second hydraulic column is extended to position the wheel hub.

[0022] Preferably, a plurality of hot air nozzles and hot steam nozzles are installed on the inner side of the annular bracket, and the hot air nozzles and hot steam nozzles are evenly arranged. The hot air nozzles are connected to the hot air exhaust pipe through the annular bracket and the mounting block, and the hot steam nozzles are connected to the steam exhaust pipe through the annular bracket and the movable guide rail.

[0023] The present invention discloses a method for deicing blades of a wind turbine generator by steam heating, which specifically comprises the following steps:

[0024] 1. Start the water pump and open the second solenoid valve to inject the water in the water tank into the steam boiler. After the electric heating tube is energized, the water is heated, and the pressure inside the steam boiler is monitored by the pressure gauge;

[0025] 2. The first hydraulic column extends to make the brake pad close to the brake disc to slow down the wheel hub, and then the second hydraulic column extends to insert the positioning block into the positioning hole to position the wheel hub so that one of the fan blades is vertically downward;

[0026] 3. When the set pressure is reached inside the steam boiler, the first solenoid valve is opened, and the steam inside the steam boiler enters the steam-water separator through the steam discharge pipe. The steam enters the steam-water separator and spirally descends along the outer wall of the swirl reversing tube and the spiral guide plate, and then rises inside the swirl reversing tube and is discharged through the discharge port. The steam containing water passes through the inner wall of the shell and the spiral guide plate, and the speed is reduced to separate the water and fall back to the water storage tank through the reflux pipe;

[0027] 4. Steam is ejected from the hot steam nozzle after passing through the steam exhaust pipe, the mounting block and the annular bracket. Start the second drive motor to drive the two annular brackets to move closer to each other so that the fan blades are surrounded in the middle of the annular brackets. Start the first drive motor to drive the mounting block to move upward along the movable guide rail for de-icing. Repeat the above operation to complete the de-icing operation of multiple fan blades.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The device is provided with a steam boiler and a steam-water separator. The hot steam generated by the steam boiler passes through the steam-water separator and spirally descends along the outer wall of the swirl reversing tube and the spiral guide plate. During this process, the speed decreases, and the water therein is separated and falls. The steam rises through the inside of the swirl reversing tube and is discharged through the discharge port. The separated water flows back to the water storage tank through the reflux pipe, which improves the steam quality and avoids energy waste.

[0030] 2. This device is equipped with a deicing unit outside the tower, which melts the ice and snow on the surface of the fan blades by spraying steam from the hot steam nozzle to the surface of the fan blades. At the same time, the annular bracket can also move up and down along the movable guide rail, which can more comprehensively remove the ice and snow on the surface of the fan blades and achieve higher deicing efficiency.

[0031] 3. The device is also provided with an air heater, which can draw external air for heating and spray it out through the hot air nozzle in the deicing unit. When the steam boiler does not generate steam with sufficient pressure, hot air can be sprayed on the ice and snow on the surface of the fan blades for deicing pretreatment, which can improve the deicing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Figure 2 It is a structural schematic diagram of the steam generating unit in the present invention;

[0034] Figure 3 It is a schematic diagram of the internal structure of the deicing unit in the present invention;

[0035] Figure 4 It is a structural schematic diagram of the annular bracket in the present invention;

[0036] Figure 5 Schematic diagram of the internal structure of the steam-water separator in the present invention;

[0037] Figure 6 It is a schematic diagram of the structure of the wheel hub in the present invention.

[0038] The numbers in the figure are:

[0039] 1. Tower;

[0040] 2. Steam generating unit; 21. Water storage tank; 211. Water pumping pipe; 212. Liquid replenishing pipe; 22. Steam boiler; 221. Electric heating pipe; 222. Steam discharge pipe; 223. Drain pipe; 224. Pressure gauge; 225. First solenoid valve; 23. Water pump; 231. Water delivery pipe; 232. Second solenoid valve; 24. Steam-water separator; 241. Shell; 242. Inlet; 243. Discharge port; 244. Reversing plate; 245. Cyclone reversing pipe; 246. Spiral guide plate; 247. Liquid separation plate; 248. Reflux pipe; 25. Air heater; 251. Filter screen; 252. Electric heating screen; 253. Hot air discharge pipe; 254. Primary blower; 255. Secondary blower;

[0041] 3. Generator compartment; 31. Wheel hub; 32. Brake disc; 33. Positioning hole; 34. First hydraulic column; 35. Second hydraulic column; 36. Positioning block;

[0042] 4. Fan blades;

[0043] 5. De-icing unit; 51. Mounting block; 52. Ring bracket; 521. Rotating gear; 522. Hot air nozzle; 523. Hot steam nozzle; 53. Moving guide rail; 531. Rack; 54. First driving motor; 541. Driving gear; 55. Second driving motor. DETAILED DESCRIPTION

[0044] 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.

[0045] like Figure 1-6 As shown, a steam-heat deicing device for wind turbine blades includes: a steam generating unit 2, a generator cabin 3 and a deicing unit 5, wherein the steam generating unit 2 is arranged at one side of a tower 1, and the blades are deiced by generating hot steam through the steam generating unit 2, the generator cabin 3 is installed at the upper end of the tower 1, and a plurality of fan blades 4 are installed at one end of the generator cabin 3, and the deicing unit 5 is arranged at the lower end of the generator cabin 3, and the hot steam generated by the steam generating unit 2 is discharged through the deicing unit 5 to spray and de-ice the blade surface.

[0046] like Figure 2 As shown, the steam generating unit 2 includes: a water tank 21, a steam boiler 22, a water pump 23 and an air heater 25. The water tank 21 is arranged inside the steam generating unit 2. The water pump 23 is installed on the upper end of the water tank 21. The input end of the water pump 23 is connected to the water pumping pipe 211. The output end of the water pump 23 is connected to the water delivery pipe 231. The other end of the water delivery pipe 231 is connected to the steam boiler 22. A second solenoid valve 232 is installed in the middle of the water delivery pipe 231. One end of the water pumping pipe 211 extends to the bottom of the water tank 21. The water in the water tank 21 is injected into the steam boiler 22 through the water pump 23. The steam boiler 22 is arranged on one side of the water tank 21. A plurality of electric heating pipes 221 are arranged inside the steam boiler 22. The electric heating pipes 221 are used to heat the water in the steam boiler 22. The end of the steam boiler 22 is connected to a replenishing pipe 212, which is used to replenish or discharge the water in the water storage tank 21. The lower end of the steam boiler 22 is connected to a drain pipe 223, which extends to the outside of the steam generating unit 2, and is used to discharge the water in the steam boiler 22. A pressure gauge 224 is installed on the top of the steam boiler 22, and the pressure inside the steam boiler 22 is monitored by the pressure gauge 224. The top of the steam boiler 22 is connected to a steam discharge pipe 222, and a steam-water separator 24 is installed in the middle of the steam discharge pipe 222. The steam-water separator 24 is used to separate water in the steam discharged from the steam boiler 22, so that the dry steam is discharged to the outside to de-ice the blades. The steam discharge pipe 222 is located between the steam boiler 22 and the steam-water separator 24 and is installed with a first solenoid valve 225.

[0047] Please refer to Figure 3 and 4The deicing unit 5 includes a mounting block 51, an annular bracket 52, a movable guide rail 53, a first drive motor 54 and a second drive motor 55. The movable guide rail 53 is installed inside the tower 1. Both ends of the mounting block 51 are slidably connected to the movable guide rail 53. A rack 531 is fixedly connected to one side of the movable guide rail 53. The first drive motor 54 is installed on one side of the mounting block 51 and a driving gear 541 is fixedly connected to its output end. The driving gear 541 is meshed with the rack 531. The first drive motor 54 drives the mounting block 51 to move up and down along the movable guide rail 53. The annular bracket 52 is provided with two and one end of each of them is fixedly connected with a rotating gear 521. The rotating gears 521 are meshed and arranged. The rotating gears 521 are meshed. 1 are all arranged inside the mounting block 51 and are rotatably connected to the inner wall of the mounting block 51. The second driving motor 55 is installed at the lower end of the mounting block 51. The output end of the second driving motor 55 is fixedly connected to one of the rotating gears 521. The second driving motor 55 can drive the two annular brackets 52 to move closer to or farther away from each other. When deicing is required, the hot air nozzles 522 move closer to each other to surround the fan blades 4 therebetween. A plurality of hot steam nozzles 523 are installed on the inner side of the annular bracket 52. The hot steam nozzles 523 are evenly arranged. The hot steam nozzles 523 are connected to the steam exhaust pipe 222 through the annular bracket 52 and the movable guide rail 53. Hot air is sprayed through the hot steam nozzles 523 to the surface of the fan blades 4 to melt ice and snow.

[0048] like Figure 5 As shown, the steam-water separator 24 includes a shell 241, an inlet 242, an outlet 243, a reversing plate 244 and a swirl reversing tube 245. The inlet 242 and the outlet 243 are respectively arranged on both sides of the shell 241. The inlet 242 and the outlet 243 are both connected to the steam outlet pipe 222. The reversing plate 244 is arranged obliquely inside the shell 241 and is fixedly connected to the inner wall of the shell 241. The middle part of the reversing plate 244 is provided with a swirl reversing tube 245. The circumferential side of the swirl reversing tube 245 is fixedly connected with a spiral guide plate 246. The lower part of the swirl reversing tube 245 is provided with a A separator plate 247 is provided with a gap between the separator plate 247 and the inner wall of the shell 241 for the separated water to pass through. The lower end of the shell 241 is connected to a reflux pipe 248, and the other end of the reflux pipe 248 is connected to the water storage tank 21. The steam enters the steam-water separator 24 through the inlet 242, and spirally descends along the outer wall of the swirl reversing tube 245 and the spiral guide plate 246. During this process, the speed decreases, and the water therein is separated and falls. The steam rises through the swirl reversing tube 245 and is discharged through the outlet 243. The separated water flows back to the water storage tank 21 through the reflux pipe 248.

[0049] In the present embodiment, a wheel hub 31 is rotatably connected to one end of the generator compartment 3, and a plurality of blades 4 are installed on the outer side of the wheel hub 31. A brake disc 32 is fixedly connected to one end of the wheel hub 31 close to the generator compartment 3. A first hydraulic column 34 is installed at one end of the generator compartment 3 through a connecting plate. A brake pad is fixedly connected to the output end of the first hydraulic column 34. The first hydraulic column 34 extends out to brake and decelerate the wheel hub 31. A plurality of positioning holes 33 are provided on the circumference of the wheel hub 31. The positioning holes 33 are arranged corresponding to the blades 4. A second hydraulic column 35 is arranged at the lower end of the wheel hub 31. The second hydraulic column 35 is installed on one side of the generator compartment 3. A positioning block 36 is fixedly connected to the output end of the second hydraulic column 35. The positioning block 36 is matched with the second hydraulic column 35. The second hydraulic column 35 extends out to position the wheel hub 31. The wheel hub 31 stops rotating and the blades 4 are positioned by the first hydraulic column 34 and the second hydraulic column 35, so that one of the blades 4 is vertically downward for easy de-icing.

[0050] The present invention also provides another embodiment, in which an air heater 25 is arranged above the water storage tank 21, and a filter screen 251 is arranged at one end of the air heater 25, and the filter screen 251 is used to filter the inhaled air to prevent external impurities from entering the air heater 25. A plurality of electric heating nets 252 are arranged inside the air heater 25, and the electric heating nets 252 are used to heat the air. One end of the air heater 25 is connected to a hot air exhaust pipe 253, and a primary blower 254 is installed inside the hot air exhaust pipe 253. A secondary blower 255 is arranged on one side of the primary blower 254, and external air is drawn in through the primary blower 254 and the secondary blower 255. To the inside of the air heater 25 and discharge the hot air from the hot air exhaust pipe 253. The diameter of the rear end of the hot air exhaust pipe 253 is smaller than that of the front end, which can further increase the flow rate of the hot air. A plurality of hot air nozzles 522 are installed on the inner side of the annular bracket 52. The hot air nozzles 522 are evenly arranged. The hot air nozzles 522 are connected to the hot air exhaust pipe 253 through the annular bracket 52 and the mounting block 51. The hot air can be discharged through the hot steam nozzles 523 and sprayed onto the surface of the fan blades 4 to assist in deicing. Since it takes a certain amount of time for the steam boiler 22 to generate steam of sufficient pressure, the air heating deicing provided in this embodiment can perform deicing pretreatment before sufficient steam is generated, thereby improving the deicing efficiency.

[0051] The present invention also provides a method for deicing blades of a wind turbine generator by steam heating, which specifically comprises the following steps:

[0052] 1. Start the water pump and open the second solenoid valve to inject the water in the water tank into the steam boiler. After the electric heating tube is energized, the water is heated, and the pressure inside the steam boiler is monitored by the pressure gauge;

[0053] 2. The first hydraulic column extends to make the brake pad close to the brake disc to slow down the wheel hub, and then the second hydraulic column extends to insert the positioning block into the positioning hole to position the wheel hub so that one of the fan blades is vertically downward;

[0054] 3. When the set pressure is reached inside the steam boiler, the first solenoid valve is opened, and the steam inside the steam boiler enters the steam-water separator through the steam discharge pipe. The steam enters the steam-water separator and spirally descends along the outer wall of the swirl reversing tube and the spiral guide plate, and then rises inside the swirl reversing tube and is discharged through the discharge port. The steam containing water passes through the inner wall of the shell and the spiral guide plate, and the speed is reduced to separate the water and fall back to the water storage tank through the reflux pipe;

[0055] 4. Steam is ejected from the hot steam nozzle after passing through the steam exhaust pipe, the mounting block and the annular bracket. Start the second drive motor to drive the two annular brackets to move closer to each other so that the fan blades are surrounded in the middle of the annular brackets. Start the first drive motor to drive the mounting block to move upward along the movable guide rail for de-icing. Repeat the above operation to complete the de-icing operation of multiple fan blades.

[0056] The above description is only a specific implementation mode of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should also be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection of the claims.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A steam heat deicing device for wind turbine blades, characterized in that: include: A steam generating unit (2), wherein the steam generating unit (2) is arranged on one side of the tower (1), and the steam generating unit (2) generates hot steam to de-ice the blades; A generator cabin (3), the generator cabin (3) being mounted on the upper end of the tower (1), and a plurality of fan blades (4) being mounted on one end of the generator cabin (3); A deicing unit (5), wherein the deicing unit (5) is arranged at the lower end of the generator cabin (3), and the hot steam generated by the steam generating unit (2) is discharged through the deicing unit (5) to spray and de-ice the blade surface; The steam generating unit (2) comprises: A water storage tank (21), the water storage tank (21) being arranged inside the steam generating unit (2), and a water pump (23) being installed at the upper end of the water storage tank (21); A steam boiler (22), the steam boiler (22) being arranged at one side of the water storage tank (21), a plurality of electric heating pipes (221) being arranged inside the steam boiler (22), the electric heating pipes (221) being used to heat water in the steam boiler (22), a pressure gauge (224) being installed on the top of the steam boiler (22), a steam discharge pipe (222) being connected to the top of the steam boiler (22), a steam-water separator (24) being installed in the middle of the steam discharge pipe (222), the steam-water separator (24) being used to separate water from steam discharged from the steam boiler (22); A water pump (23), wherein an input end of the water pump (23) is in communication with a water pumping pipe (211), and one end of the water pumping pipe (211) extends to the bottom of the water storage tank (21); An air heater (25), wherein the air heater (25) is arranged above the water storage tank (21), a plurality of electric heating nets (252) are arranged inside the air heater (25), one end of the air heater (25) is connected to a hot air exhaust pipe (253), a primary blower (254) is installed inside the hot air exhaust pipe (253), a secondary blower (255) is arranged on one side of the primary blower (254), and external air is drawn into the air heater (25) through the primary blower (254) and the secondary blower (255).

2. A steam-heat deicing device for wind turbine blades according to claim 1, characterized in that: The deicing unit (5) comprises a mounting block (51), an annular bracket (52), a movable guide rail (53), a first drive motor (54) and a second drive motor (55); the movable guide rail (53) is mounted inside the tower (1); both ends of the mounting block (51) are slidably connected to the movable guide rail (53); one side of the movable guide rail (53) is fixedly connected to a rack (531); the first drive motor (54) is mounted on one side of the mounting block (51) and an output end thereof is fixedly connected to a drive gear (541); the drive gear (541) and the rack (531) are connected to each other. 31), the first driving motor (54) drives the mounting block (51) to move up and down along the moving guide rail (53), the annular bracket (52) is provided with two and one end of each of the two is fixedly connected with a rotating gear (521), the rotating gears (521) are arranged in meshing with each other, the rotating gears (521) are arranged inside the mounting block (51) and are rotatably connected to the inner wall of the mounting block (51), the second driving motor (55) is installed at the lower end of the mounting block (51), and the output end of the second driving motor (55) is fixedly connected to one of the rotating gears (521).

3. The steam heat deicing device for wind turbine blades according to claim 1, characterized in that: The lower end of the water storage tank (21) is connected to a liquid replenishing pipe (212), and the lower end of the steam boiler (22) is connected to a drainage pipe (223), and the drainage pipe (223) extends to the outside of the steam generating unit (2).

4. The steam heat deicing device for wind turbine blades according to claim 1, characterized in that: The output end of the water pump (23) is connected to a water pipe (231), the other end of the water pipe (231) is connected to the steam boiler (22), a second solenoid valve (232) is installed in the middle of the water pipe (231), and a first solenoid valve (225) is installed on the steam discharge pipe (222) located between the steam boiler (22) and the steam-water separator (24).

5. The steam heat deicing device for wind turbine blades according to claim 1, characterized in that: The steam-water separator (24) comprises a shell (241), an inlet (242), an outlet (243), a reversing plate (244) and a swirl reversing tube (245). The shell (241) is provided with an inlet (242) and an outlet (243) on both sides thereof. The inlet (242) and the outlet (243) are both communicated with the steam outlet tube (222). The reversing plate (244) is obliquely arranged inside the shell (241) and fixedly connected to the inner wall of the shell (241). A swirl reversing tube (245) is arranged in the middle of the reversing plate (244), a spiral guide plate (246) is fixedly connected to the circumference of the swirl reversing tube (245), a liquid separator (247) is arranged below the swirl reversing tube (245), a gap for separated water to pass through is arranged between the liquid separator (247) and the inner wall of the shell (241), and a return pipe (248) is connected to the lower end of the shell (241), and the other end of the return pipe (248) is connected to the water storage tank (21).

6. The steam heat deicing device for wind turbine blades according to claim 1, characterized in that: A filter screen (251) is provided at one end of the air heater (25), and the filter screen (251) is used to filter external impurities.

7. The steam heat deicing device for wind turbine blades according to claim 1, characterized in that: One end of the generator compartment (3) is rotatably connected to a wheel hub (31), a plurality of fan blades (4) are installed on the outer side of the wheel hub (31), one end of the wheel hub (31) close to the generator compartment (3) is fixedly connected to a brake disc (32), one end of the generator compartment (3) is installed with a first hydraulic column (34) through a connecting plate, an output end of the first hydraulic column (34) is fixedly connected to a brake pad, and the first hydraulic column (34) extends to brake and decelerate the wheel hub (31).

8. A steam-heat deicing device for wind turbine blades according to claim 7, characterized in that: A plurality of positioning holes (33) are provided on the circumferential side of the wheel hub (31), and the positioning holes (33) are arranged corresponding to the fan blades (4). A second hydraulic column (35) is provided at the lower end of the wheel hub (31), and the second hydraulic column (35) is installed on one side of the generator compartment (3). A positioning block (36) is fixedly connected to the output end of the second hydraulic column (35), and the positioning block (36) is matched with the second hydraulic column (35). The second hydraulic column (35) extends out to position the wheel hub (31).

9. The steam heat deicing device for wind turbine blades according to claim 2, characterized in that: A plurality of hot air nozzles (522) and hot steam nozzles (523) are installed on the inner side of the annular bracket (52); the hot air nozzles (522) and hot steam nozzles (523) are evenly arranged; the hot air nozzles (522) are connected to the hot air exhaust pipe (253) through the annular bracket (52) and the mounting block (51); and the hot steam nozzles (523) are connected to the steam exhaust pipe (222) through the annular bracket (52) and the movable guide rail (53).

10. A method for deicing wind turbine blades by steam heating, characterized in that: The steam-heat deicing method is carried out using the steam-heat deicing device for wind turbine blades as shown in claims 1-9, and specifically comprises the following steps:

1. Start the water pump and open the second solenoid valve to inject the water in the water tank into the steam boiler. After the electric heating tube is energized, the water is heated, and the pressure inside the steam boiler is monitored by the pressure gauge; 2. The first hydraulic column extends to make the brake pad close to the brake disc to slow down the wheel hub, and then the second hydraulic column extends to insert the positioning block into the positioning hole to position the wheel hub so that one of the fan blades is vertically downward; 3. When the set pressure is reached inside the steam boiler, the first solenoid valve is opened, and the steam inside the steam boiler enters the steam-water separator through the steam discharge pipe. The steam enters the steam-water separator and spirally descends along the outer wall of the swirl reversing tube and the spiral guide plate, and then rises inside the swirl reversing tube and is discharged through the discharge port. The steam containing water passes through the inner wall of the shell and the spiral guide plate, and the speed is reduced to separate the water and fall back to the water storage tank through the reflux pipe; 4. Steam is ejected from the hot steam nozzle after passing through the steam exhaust pipe, the mounting block and the annular bracket. Start the second drive motor to drive the two annular brackets to move closer to each other so that the fan blades are surrounded in the middle of the annular brackets. Start the first drive motor to drive the mounting block to move upward along the movable guide rail for de-icing. Repeat the above operation to complete the de-icing operation of multiple fan blades.

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