CN113357103A

CN113357103A - Anti-icing protection device for icing monitoring camera of wind turbine generator

Info

Publication number: CN113357103A
Application number: CN202110837910.5A
Authority: CN
Inventors: 林伟荣; 蔡安民; 张林伟; 李媛; 郑磊; 李力森; 金强
Original assignee: Huaneng Clean Energy Research Institute
Current assignee: Huaneng Clean Energy Research Institute
Priority date: 2021-07-23
Filing date: 2021-07-23
Publication date: 2021-09-07

Abstract

The invention discloses an anti-icing protection device for an icing monitoring camera of a wind turbine generator, and belongs to the technical field of wind power generation. The anti-icing protection device is used for protecting a camera which is arranged on a tower barrel and used for monitoring the icing condition of blades, the camera is connected with a computer, and the anti-icing protection device comprises a hot air flow system and a spherical shield; the spherical shield comprises an outer shield, an inner shield and a bottom plate, the bottom plate is fixedly connected with the tower barrel, and the outer shield and the inner shield are connected with the bottom plate and arranged outside the camera; an air outlet and a plurality of air inlets are arranged on the bottom plate between the outer layer shield and the inner layer shield, and the plurality of air inlets are connected with a hot air flow system. The invention has simpler integral structure, occupies smaller space in the tower drum, and does not influence the normal operation of the fan and the normal operation of other equipment in the tower drum; the icing on the camera protective cover can be effectively solved in icing weather, the normal monitoring function of the video device is guaranteed, and the video device has a good application prospect.

Description

Anti-icing protection device for icing monitoring camera of wind turbine generator

Technical Field

The invention belongs to the technical field of wind power generation, and particularly relates to an anti-icing protection device for an icing monitoring camera of a wind turbine generator.

Background

In wind power plants in southern low wind speed areas and part of high wind speed areas, severe freezing problems generally exist in winter and spring. The icing monitoring device/system detects the icing condition on the surface of the fan blade and provides starting and stopping signals for air heating, electric heating or other anti-icing devices of the fan blade. Video/image icing detection methods have gained much attention and use, wherein image-based icing detection systems continuously take pictures of detected blades using a fixed video device and analyze the images. The image method is relatively simple and easy to implement, and the monitoring response to the icing condition is relatively intuitive.

In fact, when the wind turbine is subjected to meteorological conditions to induce icing, the wind turbine itself may form icing to different degrees except on the fan blades, that is, the video device may be in a severe environment and the monitoring may be disabled due to the fact that the equipment (particularly the camera) is covered by ice and snow. In order to protect the camera, a circular cover is conventionally arranged in front of the camera, and the problem that the blade icing detection function fails due to ice and snow covering cannot be effectively solved by the measure.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide an anti-icing protection device for an icing monitoring camera of a wind turbine generator, which can effectively solve the icing on a camera protection cover in icing weather, and ensure a normal monitoring function of a video device.

The invention is realized by the following technical scheme:

the invention discloses an anti-icing protection device for an icing monitoring camera of a wind turbine generator, which is used for protecting a camera which is arranged on a tower barrel and used for monitoring the icing condition of blades, wherein the camera is connected with a computer;

the spherical shield comprises an outer shield, an inner shield and a bottom plate, the bottom plate is fixedly connected with the tower barrel, and the outer shield and the inner shield are connected with the bottom plate and arranged outside the camera; an air outlet and a plurality of air inlets are arranged on the bottom plate between the outer layer shield and the inner layer shield, and the plurality of air inlets are connected with a hot air flow system.

Preferably, a supporting platform is arranged in the tower barrel, the hot air flow system comprises a power supply, a heating chamber, an air blower and a circuit control unit which are arranged on the supporting platform, a resistance wire is arranged in the heating chamber, the power supply is connected with the circuit control unit, the circuit control unit is respectively connected with the resistance wire and the air blower, the air blower is connected with an air inlet of the heating chamber, and an air outlet of the heating chamber is connected with a plurality of air inlets through an air supply pipe.

Further preferably, the power is the battery, and the power is connected with a plurality of photovoltaic cell board, and a plurality of photovoltaic cell board are established at a tower section of thick bamboo outer wall.

Further preferably, a gas mixing chamber is arranged between the gas supply pipe and the plurality of air inlets, the inner wall of the gas mixing chamber is a smooth curved surface, one side of the gas mixing chamber is provided with the gas inlet, the other side of the gas mixing chamber is provided with the plurality of air outlets, the gas inlet is connected with the gas supply pipe, and the plurality of air outlets are respectively connected with the plurality of air inlets.

Preferably, the plurality of air inlets are arranged at the upper part of the bottom plate, and the air outlets are arranged at the lower part of the bottom plate.

Further preferably, the plurality of air inlets are distributed at equal angular intervals, the centers of the plurality of air inlets are distributed on a distribution arc line, the midpoint of the distribution arc line is located at the highest point of the bottom plate, and the air outlet is located at the lowest point of the bottom plate.

Preferably, the cross-sectional area of the air outlet does not exceed the sum of the cross-sectional areas of the air inlets.

Preferably, the outer shield and the inner shield are quartz glass shields.

Preferably, the air inlet is provided with a first temperature measuring device, a second temperature measuring device is arranged below the spherical shield outside the tower barrel, the first temperature measuring device and the second temperature measuring device are connected to a computer, and the computer is connected with a hot air flow system.

Preferably, the connecting pipelines in the hot air flow system are all silica gel pipes.

Compared with the prior art, the invention has the following beneficial technical effects:

according to the anti-icing protection device for the ice coating monitoring camera of the wind turbine generator, hot air generated by a hot air system flows to the air outlet along the plurality of air inlets between the outer-layer shield and the inner-layer shield, uniform heat exchange between the inner part of the spherical shield and the wall surface is realized, ice coating prevention or ice coating melting of the outer-layer shield of the spherical shield can be effectively realized, and normal monitoring of the camera system on the ice coating of the blades of the wind turbine generator is guaranteed. The invention has simple integral structure, occupies small space in the tower drum, does not influence the normal operation of the fan and the normal operation of other equipment in the tower drum, and has good application prospect.

Furthermore, the hot air flow system is simple in structure and convenient to construct; the support platform is arranged on the support platform in a centralized manner, so that the installation and maintenance are convenient.

Furthermore, the power supply adopts a storage battery, and the power supply supplies power through a photovoltaic cell panel arranged on the outer wall of the tower barrel, so that sunlight irradiating the tower barrel every day can be fully converted, and the storage battery can be continuously charged; and the system is independent of the circuit of the wind turbine generator, has high reliability and has small influence on the fan.

Furthermore, a gas mixing chamber is arranged between the gas supply pipe and the plurality of air inlets, so that hot gas flow can uniformly enter each air inlet after being buffered.

Furthermore, the sectional area of the air outlet does not exceed the sum of the sectional areas of the air inlets, so that the resistance of hot air flow in an interlayer space between the outer-layer shield and the inner-layer shield is reduced.

Furthermore, the outer layer shield and the inner layer shield are quartz glass covers, so that the light transmittance is good, the hardness is high, and the camera can be better protected.

Furthermore, by arranging the first temperature measuring device and the second temperature measuring device, the working parameters of the hot air flow system can be reasonably controlled according to the external environment temperature, the automation degree is high, and the energy consumption is saved.

Furthermore, the connecting pipelines in the hot air flow system are all silica gel tubes, so that the heat resistance and the ageing resistance are good.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic diagram of a wind turbine blade icing condition monitoring system based on image recognition in the prior art;

FIG. 3 is a front view of the spherical shroud;

FIG. 4 is a top view of a photovoltaic panel disposed on an outer wall of a tower.

In the figure: 1. a tower drum; 2. a blade; 3. a camera; 4. a computer; 5. a cable; 6. an outer shield; 7. an inner shield; 8. an air inlet; 9. an air outlet; 10. a support platform; 11. a photovoltaic cell panel; 12. a power source; 13. a heating chamber; 14. a resistance wire; 15. a blower; 16. a circuit control unit; 17. a first temperature measuring device; 18. a second temperature measuring device; 19. a spherical shield; 20. a base plate; 21. an air supply pipe.

Detailed Description

The invention will now be described in further detail with reference to the following drawings and specific examples, which are intended to be illustrative and not limiting:

as shown in fig. 2, a camera 3 for monitoring the icing condition on a blade 2 is installed at a specific height of a tower barrel 1 of a wind turbine generator at present, a shot image of the camera 3 is connected to a computer 4 arranged at the bottom of the tower barrel through a cable 5, a driving program and control software of the camera 3 are installed in the computer 4, the shot image of the camera 3 is transmitted to the computer 4 for storage according to a certain frequency (such as 1-2 pieces/minute), an operator can remotely operate the computer 4 and process, compare and analyze the image based on an icing identification algorithm, and can judge the icing condition of the blade and start/stop an anti-icing system of the blade.

The anti-icing protection device for the icing monitoring camera of the wind turbine generator is used for protecting the camera 3 which is arranged on the tower barrel 1 and used for monitoring the icing condition of the blade 2, the camera 3 is connected with the computer 4, and the anti-icing protection device comprises a hot air flow system and a spherical shield 19; the spherical shield 19 comprises an outer shield 6, an inner shield 7 and a bottom plate 20, the bottom plate 20 is fixedly connected with the tower barrel 1, and the outer shield 6 and the inner shield 7 are connected with the bottom plate 20 and arranged outside the camera 3; an air outlet 9 and a plurality of air inlets 8 are arranged on the bottom plate 20 between the outer protective cover 6 and the inner protective cover 7, and the plurality of air inlets 8 are connected with a hot air flow system.

In a preferred embodiment of the present invention, a supporting platform 10 is disposed in the tower barrel 1, the hot air flow system includes a power supply 12, a heating chamber 13, a blower 15 and a circuit control unit 16 which are disposed on the supporting platform 10, a resistance wire 14 is disposed inside the heating chamber 13, the power supply 12 is connected to the circuit control unit 16, the circuit control unit 16 is respectively connected to the resistance wire 14 and the blower 15, the blower 15 is connected to an air inlet of the heating chamber 13, and an air outlet of the heating chamber 13 is connected to the air inlets 8 through an air feeding pipe 21. Preferably, the power source 12 is a storage battery, the power source 12 is connected with a plurality of photovoltaic cell panels 11, and the photovoltaic cell panels 11 are arranged on the outer wall of the tower 1. Preferably, a gas mixing chamber is arranged between the air supply pipe 21 and the plurality of air inlets 8, the inner wall of the gas mixing chamber is a smooth curved surface, one side of the gas mixing chamber is provided with an air inlet, the other side of the gas mixing chamber is provided with a plurality of air outlets, the air inlet is connected with the air supply pipe 21, and the air outlets are respectively connected with the plurality of air inlets 8.

In a preferred embodiment of the present invention, the air inlets 8 are disposed on the upper portion of the bottom plate 20, and the air outlets 9 are disposed on the lower portion of the bottom plate 20. Preferably, the plurality of air inlets 8 are distributed at equal angular intervals, the centers of the plurality of air inlets 8 are distributed on a distribution arc line, the middle point of the distribution arc line is located at the highest point of the bottom plate 20, and the air outlet 9 is located at the lowest point of the bottom plate 20.

In a preferred embodiment of the invention, the cross-sectional area of the outlet opening 9 does not exceed the sum of the cross-sectional areas of the inlet openings 8.

In a preferred embodiment of the invention, the outer shield 6 and the inner shield 7 are quartz glass shields.

In a preferred embodiment of the present invention, the air inlet 8 is provided with a first temperature measuring device 17, a second temperature measuring device 18 is arranged below a spherical shield 19 outside the tower 1, the first temperature measuring device 17 and the second temperature measuring device 18 are connected to the computer 4, and the computer 4 is connected to a hot air flow system.

In a preferred embodiment of the present invention, the connecting pipes in the hot air flow system are silicone pipes.

The following is a specific example:

referring to fig. 1, a support platform 10 is disposed inside a tower 1 at a suitable position near a camera 3, a power source 12, a small blower 15 and a heating chamber 13 are disposed on the support platform 10, wherein the power source 12 is a battery, the heating chamber 13 is a heat-resistant glass tube, and a resistance wire 14 is fixedly disposed inside the heat-resistant glass tube disposed on the support platform 10.

A hemispherical spherical shield 19 with a certain diameter (such as 30-40 cm) is fixedly arranged outside the camera 3, the spherical shield 19 is formed by connecting an outer shield 6, an inner shield 7 and a bottom plate 20, and an air interlayer is arranged inside the spherical shield 19. The spherical shield 19 can be made of quartz glass with good light transmittance and high hardness, so that the camera 3 can be better protected and the ice coating prevention function can be realized. Due to the conical shape of the tower 1 itself, the spherical cover 19 is not strictly hemispherical, and the bottom plate 20 thereof should be shaped to closely fit the tower 1.

Referring to fig. 3, 5

air inlets

8 and 1 air outlet 9 are respectively disposed at the upper end and the lower end of the bottom plate 20. The air outlet 9 is located at the lowest position in the height direction, and the air inlet 8 in the middle is located at the highest position in the height direction. The 5 air inlets 8 are arranged at equal intervals along the circumferential direction, the circle center angle of two adjacent air inlets is 30 degrees, namely the total circle center angle of the 5 air inlets 8 is 120 degrees. The arrangement design of the 5 air inlets 8 can ensure that the hot air enters the spherical shield 19 from multiple positions, namely flows through most of the inner space of the spherical shield 19, and has relatively uniform heating effect on the whole spherical shield 19.

Because the icing condition of the outer surface of the spherical shield 19 is not serious than that of the surface of the blade 2, in fact, under the condition that the hot air in the spherical shield 19 continuously circulates, the heat conduction of the outer shield 6 can be smoothly carried out without large flow to melt the ice coated on the surface of the outer shield. Therefore, the diameter of the air inlet 8 can be selected to be small (such as 2-3 cm), and the cross-sectional area of the air outlet 9 is the sum of the cross-sectional areas of the 5 air inlets 8. The design regarding the diameters of the air inlet 8 and the air outlet 9 allows the hot air to flow smoothly inside the spherical shield 19 with low resistance.

Because the resistance wire 14 is fixedly arranged in the heat-resistant glass tube on the supporting platform 10, the diameter of the resistance wire can be selected to be larger, the heat-resistant glass can be selected as the material, and the plurality of sections of resistance wires 14 are connected in parallel in the interior and fixed in the tube (are not in contact with the tube wall). The silicon rubber tube is connected with the air inlet 8, the heat-resisting glass tube and the blower 15 in sequence to form an air circulation pipeline, and the blower 15 sucks air from the interior of the tower barrel 1, sends the air into the heat-resisting glass tube for heating and sends hot air into the spherical shield 19. The hot air slowly flows within the spherical shroud 19 and heats the glass material of the spherical shroud 19. The temperature of the whole spherical shield 19 is kept at 20-30 ℃, so that ice can be prevented and removed from the spherical shield 19 smoothly, the freezing of the wet cold air between the spherical shield 19 and the camera 3 is prevented, and the normal work of the camera 3 is not influenced.

As shown in fig. 4, an indefinite number of photovoltaic cell panels 11 may be uniformly arranged on the outer wall of the tower tube 1 along the circumferential direction, and a wire is connected between the photovoltaic cell panels 11 and is tightly fixed to the outer wall of the tower tube 1. The two output poles of the photovoltaic cell panel 11 are connected to the charging electrode of the storage battery through a lead passing through the tower 1. By properly selecting the capacity (such as a lower power generation level) of the photovoltaic cell panel 11, basically, the tower 1 can be irradiated by sunlight to different degrees during the normal operation of the wind turbine generator, and the output current of the tower directly charges the storage battery.

The power transmission electrodes of the battery are connected to a resistance wire 14 and a blower 15, respectively, via a circuit control unit 16, i.e. the system of the invention is operated solely by the battery. The circuit control unit 16 is connected with the computer 4 arranged at the bottom of the tower barrel 1, an operator can remotely control the computer 4 and operate the circuit control unit 16, and the circuit control unit 16 has the following functions:

1) the start or stop of the resistance wire 14 and the blower 15 can be controlled respectively;

2) the heating current of the resistance wire 14 can be adjusted;

3) the ventilation quantity of the blower 15 can be adjusted;

in order to reasonably control the power of the resistance wire 14 and the ventilation volume of the blower 15, a first temperature measuring device 17 is installed on the air inlet 8, the top of the first temperature measuring device 17 is inserted into the air inlet 8 and used for measuring the temperature of hot air pumped into the spherical shield 19, and similarly, a second temperature measuring device 18 is arranged at a proper position, close to the lower part of the spherical shield 19, of the tower barrel 1 and used for measuring the ambient temperature. The first temperature measuring device 17 and the second temperature measuring device 18 are respectively connected with the computer 4, a thermoelectric even data collector is integrated in the computer 4, finally, the temperature measured by two thermocouples can be directly displayed on the computer 4, the measured temperature of the first temperature measuring device 17 is 20-30 ℃ higher than that of the second temperature measuring device 18 through the operation of the computer 4 on the circuit control unit 16, and the measured temperature value provides direct reference for operating personnel to optimize system operation parameters through the computer 4.

The temperature and the flow of hot air are adjusted by adjusting the running current of the resistance wire 14 and the blower 15, so that the ice prevention and removal requirements of the spherical shield 19 under different environmental meteorological conditions are met. The system can also operate under the condition of no ice coating formation and operate at night, the stored energy of the storage battery is consumed, and the overcharge problem after the storage battery is fully charged is avoided.

The above description is only a part of the embodiments of the present invention, and although some terms are used in the present invention, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention and are to be construed as any additional limitation which is not in accordance with the spirit of the invention. The foregoing is merely an illustration of the present invention for the purpose of providing an easy understanding and is not intended to limit the present invention to the particular embodiments disclosed herein, and any technical extensions or innovations made herein are protected by the present invention.

Claims

1. An anti-icing protection device for an icing monitoring camera of a wind turbine generator is used for protecting a camera (3) which is arranged on a tower barrel (1) and used for monitoring the icing condition of a blade (2), and the camera (3) is connected with a computer (4), and is characterized by comprising a hot air flow system and a spherical shield (19);

the spherical shield (19) comprises an outer shield (6), an inner shield (7) and a bottom plate (20), the bottom plate (20) is fixedly connected with the tower drum (1), and the outer shield (6) and the inner shield (7) are connected with the bottom plate (20) and arranged outside the camera (3); an air outlet (9) and a plurality of air inlets (8) are arranged on the bottom plate (20) between the outer protective cover (6) and the inner protective cover (7), and the plurality of air inlets (8) are connected with a hot air flow system.

2. The anti-icing protection device for the icing monitoring camera of the wind turbine generator system according to claim 1, wherein a support platform (10) is arranged in the tower tube (1), the hot air flow system comprises a power supply (12) arranged on the support platform (10), a heating chamber (13), a blower (15) and a circuit control unit (16), a resistance wire (14) is arranged inside the heating chamber (13), the power supply (12) is connected with the circuit control unit (16), the circuit control unit (16) is respectively connected with the resistance wire (14) and the blower (15), the blower (15) is connected with an air inlet of the heating chamber (13), and an air outlet of the heating chamber (13) is connected with the air inlets (8) through an air supply pipe (21).

3. The anti-icing protection device for the icing monitoring camera of the wind turbine generator set according to claim 2, wherein the power supply (12) is a storage battery, the power supply (12) is connected with a plurality of photovoltaic cell panels (11), and the photovoltaic cell panels (11) are arranged on the outer wall of the tower barrel (1).

4. The anti-icing protection device for the ice-coating monitoring camera of the wind turbine generator set according to claim 2, wherein a gas mixing chamber is arranged between the air supply pipe (21) and the plurality of air inlets (8), the inner wall of the gas mixing chamber is a smooth curved surface, one side of the gas mixing chamber is provided with an air inlet, the other side of the gas mixing chamber is provided with a plurality of air outlets, the air inlet is connected with the air supply pipe (21), and the air outlets are respectively connected with the plurality of air inlets (8).

5. The anti-icing protection device for the icing monitoring camera of the wind turbine generator system according to claim 1, wherein a plurality of air inlets (8) are formed in the upper portion of the base plate (20), and the air outlets (9) are formed in the lower portion of the base plate (20).

6. The anti-icing protection device for the icing monitoring camera of the wind turbine generator set according to claim 5, wherein the plurality of air inlets (8) are distributed at equal angular intervals, the centers of the plurality of air inlets (8) are distributed on a distribution arc line, the midpoint of the distribution arc line is located at the highest point of the bottom plate (20), and the air outlet (9) is located at the lowest point of the bottom plate (20).

7. The anti-icing protection device for the icing monitoring camera of the wind turbine generator set according to claim 1, wherein the cross-sectional area of the air outlet (9) does not exceed the sum of the cross-sectional areas of the air inlets (8).

8. The anti-icing protection device for the icing monitoring camera of the wind turbine generator set according to claim 1, characterized in that the outer shield (6) and the inner shield (7) are quartz glass covers.

9. The anti-icing protection device for the icing monitoring camera of the wind turbine generator system according to claim 1, wherein the air inlet (8) is provided with a first temperature measuring device (17), a second temperature measuring device (18) is arranged below a spherical shield (19) outside the tower (1), the first temperature measuring device (17) and the second temperature measuring device (18) are connected to the computer (4), and the computer (4) is connected with a hot air flow system.

10. The anti-icing protection device for the icing monitoring camera of the wind turbine generator according to claim 1, wherein connecting pipelines in a hot air flow system are all silica gel tubes.