CN112761904B - Fan blade deicing system and working method thereof - Google Patents
Fan blade deicing system and working method thereof Download PDFInfo
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- CN112761904B CN112761904B CN202110217566.XA CN202110217566A CN112761904B CN 112761904 B CN112761904 B CN 112761904B CN 202110217566 A CN202110217566 A CN 202110217566A CN 112761904 B CN112761904 B CN 112761904B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000000694 effects Effects 0.000 abstract description 14
- 238000012546 transfer Methods 0.000 abstract description 7
- 238000010248 power generation Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 4
- 230000008646 thermal stress Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/40—Ice detection; De-icing means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements of the blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/303—Temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a fan blade deicing system and a working method thereof, and belongs to the technical field of wind power generation. The device comprises a fan outlet pipeline, a first air passage, a second air passage and a baffle plate; the outlet pipeline of the fan is a straight pipe, the first air path and the second air path are arranged in a layered roundabout way between the front edge of the blade and the web, and the first air path is arranged close to the front edge of the blade; the baffle is fixedly connected with the front edge of the blade and the web plate respectively, and a first air passage interface and a second air passage interface which are communicated are arranged on the baffle; one end of the first air passage is connected with the fan outlet pipeline, and the other end of the first air passage is connected with the first air passage interface; one end of the second air channel is connected with the fan outlet pipeline, and the other end of the second air channel is connected with the second air channel interface; the second air path is provided with a valve, the front edge of the blade is provided with a blade front edge thermometer, and the web is provided with a web thermometer. The invention optimizes the structure of deicing pipelines in the fan blades, improves the heat transfer effect in the blades, and improves the economy and safety of a deicing system.
Description
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a fan blade deicing system and a working method thereof.
Background
With the continuous development of wind power generation, a plurality of wind power plants are positioned in areas which are easy to freeze, and icing is easy to occur when the ambient temperature is reduced to about 0 ℃. Once the surface of the blade is frozen, the problems of performance degradation, mechanical failure and the like are caused, and meanwhile, additional economic loss is caused due to freezing and shutdown. Currently, research on deicing technology of wind turbine generator sets can be largely divided into two main categories: firstly, a hot blast deicing technology; and secondly, an electric heating deicing technology. The hot blast deicing has the characteristics of controllable technical risk, convenient installation, no lightning strike risk, proper new installation and transformation, and the like, so the hot blast deicing is more widely adopted.
The existing hot blast deicing technology utilizes a heat-conducting pipe to send hot air into the interior of a fan blade to exchange heat with the blade. In actual operation, the blade tip has a relatively high linear speed and relatively high heat dissipation, so that the icing trend is relatively obvious. However, when heat exchange with hot air is performed, the closer to the blade tip, the lower the temperature of the air flow becomes, and the flow passage becomes narrower, so that the residence time of the air flow is reduced, which is extremely undesirable for the heat transfer effect. If serious uneven heating exists, the thermal stress in the blade is too large, fatigue and aging of the blade are accelerated, and adverse effects are brought to the safety of the unit.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a fan blade deicing system and a working method thereof, which optimize the structure of deicing pipelines in fan blades, improve the heat transfer effect in the blades and improve the economical efficiency and safety of the deicing system.
The invention is realized by the following technical scheme:
the invention discloses a fan blade deicing system, which comprises a fan outlet pipeline, a first air passage, a second air passage and a baffle plate; the outlet pipeline of the fan is a straight pipe, the first air path and the second air path are arranged in a layered roundabout way between the front edge of the blade and the web, and the first air path is arranged close to the front edge of the blade; the baffle is fixedly connected with the front edge of the blade and the web plate respectively, and a first air passage interface and a second air passage interface which are communicated are arranged on the baffle; one end of the first air passage is connected with the fan outlet pipeline, and the other end of the first air passage is connected with the first air passage interface; one end of the second air channel is connected with the fan outlet pipeline, and the other end of the second air channel is connected with the second air channel interface; the second air path is provided with a valve, the front edge of the blade is provided with a blade front edge thermometer, and the web is provided with a web thermometer.
Preferably, the first and second air paths are each located at a trisection between the leading edge of the blade and the web.
Preferably, the first air path and the second air path are square waveforms.
It is further preferred that the section of the first air passage close to the leading edge of the blade matches the curvature of the leading edge of the blade.
Preferably, the distribution density of the first air path and the second air path increases along the fan outlet duct to the baffle.
Preferably, the first air path and the second air path have a detour value of greater than 30cm.
Preferably, the first air path and the second air path have opposite detour directions.
Preferably, the length of the fan outlet duct is 2-3 m.
The working method of the fan blade deicing system disclosed by the invention comprises the following steps:
when the fan blade needs to be heated, deicing air flows through the hot air blower to enter an outlet pipeline of the fan, and when the difference between the temperature measured by the blade front edge thermometer and the temperature measured by the web thermometer is smaller than a preset temperature difference value, the valve is closed, and the deicing air flows in the first air path for heat exchange; when the difference between the temperature measured by the blade front edge temperature measuring instrument and the temperature measured by the web temperature measuring instrument is greater than or equal to a preset temperature difference value, the valve is opened, deicing airflow is divided into two paths which respectively flow through the first air path interface and the second air path interface on the baffle plate and then are mixed in the internal channel of the blade, flow towards the blade tip, bypass the end part of the web after reaching the blade tip, enter a space surrounded by the web and the blade rear edge for heat exchange, and flow out of the blade at the blade root.
Preferably, the preset temperature difference is 5 ℃.
Compared with the prior art, the invention has the following beneficial technical effects:
in the existing technical scheme, the heat-blast deicing of the fan adopts a downstream heat-transfer arrangement mode no matter through the heat-conducting pipe or the runner formed by the web plate of the blade, the temperature of the heat-exchange airflow at the tip of the blade is lower, the flow speed is faster, the stay time of the deicing airflow is shorter, the heat-transfer effect is reduced, and the situation is different from the actual situation that the icing is serious at the position close to the blade tip. Meanwhile, the deicing pipeline is arranged close to the front edge of the blade, and a certain degree of uneven heating can be caused in the chord length direction.
According to the fan blade deicing system disclosed by the invention, the design of the fan blade deicing pipeline is optimized, and the residence time of gas is reasonably controlled through the design of the flow channel along the direction of the blade in the expanding direction, so that higher coincidence is realized between heat distribution and an ice-covered area. And two layers of air channels are arranged along the chord length direction, so that the inside of the blade is heated uniformly, and the thermal stress is reduced. The air flow from the hot air blower outlet is fed into a first air path disposed proximate the leading edge of the blade. The fan outlet pipeline adopts a straight pipe, and after entering a section of area of the blade to reach the first air path and the second air path, the fan outlet pipeline adopts circuitous air path arrangement, so that the residence time of unit spreading distance air flow is increased, the heat exchange time is increased, the heat exchange effect is enhanced, and the fan outlet pipeline has a better effect of removing ice coating close to the blade tip. The real-time temperature feedback of the blade front edge thermometer and the web thermometer is used for closed-loop adjustment, and the opening degree of the valve on the second air path is adjusted, so that the temperature inside the blade is balanced, and the generation of large thermal stress along the chord length direction is avoided. The invention optimizes the structure of deicing pipelines in the fan blades, improves the heat transfer effect in the blades, and improves the economy and safety of a deicing system.
Further, the first air passage and the second air passage are uniformly distributed between the front edge of the blade and the web plate, and uneven temperature along the chord length direction of the blade can be avoided.
Further, the first air channel and the second air channel are square waveforms, and processing and installation can be facilitated.
Further, the pipe section of the first air passage close to the front edge of the blade is matched with the curvature of the front edge of the blade, so that the heating effect on the front edge of the blade can be improved.
Further, the distribution density of the first air channel and the second air channel is increased along the outlet pipeline of the fan to the baffle, the longer the residence time of unit spanwise airflow is, the heat exchange time is increased, the heat exchange effect is enhanced, and the removal effect of ice coating near the blade tip part can be improved.
Further, the circuitous amplitude of the first air channel and the second air channel is larger than 30cm, so that the local loss of airflow can be reduced.
Further, the circuitous directions of the first air channel and the second air channel are opposite, so that heat flow can be better distributed, and uneven temperature inside the blade is reduced.
According to the working method of the fan blade deicing system disclosed by the invention, through real-time temperature feedback of the blade front edge thermometer and the web thermometer, the heat transfer effect inside the blade can be improved, the temperature balance inside the blade is improved, and the fan blade deicing system has a good application prospect.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a view A-A of FIG. 1;
FIG. 3 is a view B-B of FIG. 1;
fig. 4 is a schematic structural view of the baffle.
In the figure: 1-a fan outlet duct; 2-valve; 3-a second air path; 4-a first air path; 5-blade leading edge; 6-blade front edge thermometer; 7-a baffle; 701-a second air path interface; 702—a first air path interface; 8-a web thermometer; 9-a web; 10-blade trailing edge; 11-blade root; 12-suction surface; 13-pressure face.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings, the content of which is to be interpreted as illustrative and not limiting:
referring to fig. 1, the deicing system for fan blades according to the present invention comprises a fan outlet pipeline 1, a first air path 4, a second air path 3 and a baffle 7. The fan outlet pipeline 1 is a straight pipe, and the length of the fan outlet pipeline 1 is generally 2-3 m.
The first air passage 4 and the second air passage 3 are arranged in a layered and circuitous manner between the blade leading edge 5 and the web 9, and the first air passage 4 is arranged close to the blade leading edge 5; preferably, the first air path 4 and the second air path 3 are located at trisection positions between the blade leading edge 5 and the web 9, respectively.
As shown in fig. 4, a baffle 7 is fixedly connected with a front edge 5 and a web 9 of the blade, and a first air passage interface 702 and a second air passage interface 701 which are communicated are formed on the baffle 7; one end of the first air passage 4 is connected with the fan outlet pipeline 1, and the other end is connected with the first air passage interface 702; one end of the second air path 3 is connected with the fan outlet pipeline 1, and the other end is connected with the second air path interface 701.
The second air path 3 is provided with a valve 2, the blade front edge 5 is provided with a blade front edge thermometer 6, and the web 9 is provided with a web thermometer 8.
In a preferred embodiment of the invention, as shown in fig. 2 and 3, the first air path 4 and the second air path 3 are square wave shaped, the section of the first air path 4 near the blade leading edge 5 matches the curvature of the blade leading edge 5, and at the same time, the distribution density of the first air path 4 and the second air path 3 increases along the fan outlet duct 1 to the baffle 7. The circuitous amplitude of the first air passage 4 and the second air passage 3 is larger than 30cm, and the circuitous directions of the first air passage 4 and the second air passage 3 are opposite. The first air path 4 and the second air path 3 may also take a sine waveform.
The working principle of the invention is as follows:
the deicing air flow is heated by the heater at a position close to the blade root 11 and enters the inner duct of the blade from the fan outlet duct 1. The initial section airflow flows along a pipeline which is closely attached to the front edge 5 of the blade, and the deicing airflow pipeline is divided into a first air channel 4 and a second air channel 3 by the arrangement of a three-way valve at a position 2-3 m away from the outlet of the fan, and the flow between the two air channels is regulated by the valve 2. For the first air passage 4, it is arranged along a position close to the blade leading edge 5. In order to adjust the residence time of the air flow, the first air passage 4 adopts a curved air passage arrangement, and the embodiment adopts a square wave shaped curved circuit. The connection between the pipelines adopts smooth joints, so that the local resistance of the gas flow is reduced. The spacing of the square wave forms is reduced along different spanwise positions, namely, the closer to the blade tip direction, the more densely the square wave form bent pipelines are distributed, the longer the residence time of unit spanwise airflow is, the heat exchange time is increased, and the heat exchange effect is enhanced. For the second air path 3 arranged close to the web 9, the aim is to reduce temperature non-uniformities along the chord length of the blade. The second gas path 3 is arranged between the web 9 and the blade leading edge 5 at a distance of two thirds of the distance from the blade leading edge 5 to the web 9, i.e. at a distance of one third of the distance from the blade leading edge 5 to the web 9. The second air passage 3 is provided with an air flow regulating valve 2, and the air flow of the second air passage 3 is reasonably regulated according to the temperature distribution of the blades. A blade front edge thermometer 6 is arranged at the middle section of the blade front edge 5, and a web thermometer 8 is arranged at the corresponding position of the web 9. When the deicing system is just startedIn operation, the valve 2 is in a closed state, and the deicing air flow only flows through the first air passage 4 for heat exchange. Reading the temperature T of the blade leading edge thermometer 6 0 And temperature T of web thermometer 8 1 When T 1 Ratio T 0 The opening degree of the valve 2 is gradually increased when the temperature is lower than 5 ℃ until T 1 And T is 0 The temperature difference between them being within 5 ℃, i.e. by T 0 And T 1 Closed-loop control of the opening of the valve 2 is realized. The tail ends of the first air passage 4 and the second air passage 3 are connected to the baffle 7 and are tightly adhered. After the airflows of the first air path 4 and the second air path 3 flow through the baffle, the airflows are mixed in the internal channels of the blade and flow towards the blade tip. The baffle 7 seals against the inner surface of the vane and the web against backflow. The deicing airflow flows to the blade tip, bypasses the web 9, enters the space surrounded by the web 9 and the blade trailing edge 10 for heat exchange, and then flows out of the blade at the blade root 11.
Fig. 2 is a schematic view of the second gas circuit 3 seen in the direction A-A, the circuit being arranged between the pressure side 13 and the suction side 12. The closer to the blade root 11, the more densely the square-wave curved lines are distributed. To reduce the local loss of airflow, the shortest square wave tubing is no shorter than 30cm.
Fig. 3 is a schematic view of the first air passage 4 viewed from the B-B direction. The piping is arranged between the pressure side 13 and the suction side 12. The closer to the blade root 11, the more densely the square-wave curved lines are distributed. The arrangement mode of the square wave-shaped pipeline of the second air circuit 3 is staggered with the first air circuit 4, so that heat is distributed more uniformly in space, and thermal stress is reduced.
Fig. 4 is a schematic cross-sectional view of a baffle. The second air passage 3 is connected with and tightly adhered to a second air passage interface 701 on the baffle 7, and the first air passage 4 is connected with and tightly adhered to a first air passage interface 702 on the baffle 7.
The foregoing is only a part of the embodiments of the present invention, and although some terms are used in the present invention, the use of other terms is not excluded. These terms are used merely for convenience of description and to explain the nature of the invention and are to be construed as any additional limitations that are not intended to depart from the spirit of the invention. The foregoing description of the invention is provided by way of example only to facilitate easy understanding, but is not intended to limit the scope of the invention to any particular embodiment or embodiment, and is to be construed as being limited thereto.
Claims (9)
1. The working method of the fan blade deicing system is characterized in that the system comprises a fan outlet pipeline (1), a first air passage (4), a second air passage (3) and a baffle plate (7); the fan outlet pipeline (1) is a straight pipe, the first air channel (4) and the second air channel (3) are arranged in a layered roundabout manner between the front edge (5) of the blade and the web (9), and the first air channel (4) is arranged close to the front edge (5) of the blade; the baffle (7) is fixedly connected with the front edge (5) and the web (9) of the blade respectively, and a first air passage interface (702) and a second air passage interface (701) which are communicated are formed in the baffle (7); one end of the first air passage (4) is connected with the fan outlet pipeline (1), and the other end of the first air passage is connected with the first air passage interface (702); one end of the second air channel (3) is connected with the fan outlet pipeline (1), and the other end of the second air channel is connected with the second air channel interface (701); a valve (2) is arranged on the second air path (3), a blade front edge thermometer (6) is arranged on the blade front edge (5), and a web thermometer (8) is arranged on the web (9);
the working method comprises the following steps:
when the fan blade needs to be heated, deicing air flows through the hot air blower to enter the fan outlet pipeline (1), and when the difference between the temperature measured by the blade front edge thermometer (6) and the temperature measured by the web thermometer (8) is smaller than a preset temperature difference value, the valve (2) is closed, and the deicing air flows in the first air passage (4) for heat exchange; when the difference between the temperature measured by the blade front edge thermometer (6) and the temperature measured by the web thermometer (8) is larger than or equal to a preset temperature difference value, the valve (2) is opened, deicing airflow is divided into two flows which respectively flow through the first air passage (4) and the second air passage (3), and the deicing airflow is mixed in the internal passage of the blade through the first air passage interface (702) and the second air passage interface (701) on the baffle plate and flows towards the blade tip, bypasses the end part of the web (9) after reaching the blade tip, enters the space surrounded by the web (9) and the blade rear edge (10), exchanges heat, and flows out of the blade at the blade root (11).
2. A method of operating a fan blade deicing system according to claim 1, characterized in that the first air path (4) and the second air path (3) are located at trisection positions between the blade leading edge (5) and the web (9), respectively.
3. A method of operating a fan blade deicing system according to claim 1, characterized in that the first air path (4) and the second air path (3) are square waveforms.
4. A method of operating a fan blade deicing system according to claim 3, characterized in that the section of the first air path (4) close to the blade leading edge (5) matches the curvature of the blade leading edge (5).
5. A method of operating a fan blade deicing system according to claim 1, characterized in that the distribution density of the first air path (4) and the second air path (3) increases along the fan outlet duct (1) to the baffle (7).
6. A method of operating a fan blade deicing system according to claim 1, characterized in that the first air path (4) and the second air path (3) have a detour amplitude of more than 30cm.
7. A method of operating a fan blade deicing system according to claim 1, characterized in that the directions of detouring of the first air path (4) and the second air path (3) are opposite.
8. A method of operating a fan blade deicing system according to claim 1, characterized in that the length of the fan outlet duct (1) is 2-3 m.
9. A method of operating a fan blade deicing system according to claim 1, wherein the preset temperature difference is 5 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110217566.XA CN112761904B (en) | 2021-02-26 | 2021-02-26 | Fan blade deicing system and working method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110217566.XA CN112761904B (en) | 2021-02-26 | 2021-02-26 | Fan blade deicing system and working method thereof |
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| CN112761904A CN112761904A (en) | 2021-05-07 |
| CN112761904B true CN112761904B (en) | 2024-01-30 |
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|---|---|---|---|---|
| DE102010051297A1 (en) * | 2010-11-12 | 2012-05-16 | Nordex Energy Gmbh | Rotor blade for wind turbine, has bars connected with inner sides of rotor blade wall, and air passage surface formed by apertures and arranged at reduced distance from blade root, where one of bars comprises apertures in region of tip |
| WO2013107457A1 (en) * | 2012-01-20 | 2013-07-25 | Vestas Wind Systems A/S | Method of de-icing a wind turbine blade |
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| Publication number | Publication date |
|---|---|
| CN112761904A (en) | 2021-05-07 |
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