CN112832961A - Pneumatic deicing system for blades of wind turbine generator and working method of pneumatic deicing system - Google Patents
Pneumatic deicing system for blades of wind turbine generator and working method of pneumatic deicing system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 108
- 238000007710 freezing Methods 0.000 claims description 9
- 230000008014 freezing Effects 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 238000010248 power generation Methods 0.000 abstract description 7
- 238000011217 control strategy Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 108010066057 cabin-1 Proteins 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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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
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
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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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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses a pneumatic deicing system for blades of a wind turbine generator and a working method of the pneumatic deicing system, and belongs to the technical field of wind power generation. And a generator cooling bypass is arranged beside the generator cooling loop. When the blades are frozen, part of circulating air in the generator enters the bypass heat exchanger to exchange heat with the deicing airflow. The deicing airflow absorbs partial heat from circulating air in the generator through the heat exchanger, and then is sent to the blades to heat the blades, so that the icing phenomenon is prevented. The control system adjusts the opening of the control valve according to the temperature measured by the blade temperature sensor, and adjusts the flow of internal circulating gas entering the cooling bypass. When the flow of the bypass opening main path is reduced, the output of a cooling pipeline fan is reduced, and the energy consumption of the whole machine is saved. The targeted control strategy is refined aiming at the running environment of the fan, the energy is fully utilized, the cascade utilization of the energy of the wind generating set is realized, the overall energy consumption of the system is reduced, and the generating efficiency of the whole machine is improved.
Description
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a pneumatic deicing system for blades of a wind turbine generator and a working method of the pneumatic deicing system.
Background
With the development of wind power generation in China, a plurality of wind power plants are located in areas easy to freeze, and certain influence is caused on the application of wind power generation. When the environmental temperature of a fan running in a high-humidity area is reduced to about 0 ℃, and water drops in wet air collide with the surface of a blade shell (the surface temperature of the blade shell is not higher than the environmental temperature), latent heat is released, and the phenomenon of icing occurs. Once the surface of the blade is frozen, on one hand, the aerodynamic performance of the blade is affected, the generating efficiency of a unit is reduced (20% -50% of generating capacity loss is caused when the blade is heavily iced), and meanwhile, the service life of the blade is shortened. Currently, the research on the deicing technology of the wind generating set can be roughly divided into two categories: firstly, a hot blast deicing technology; and the other is an electric heating deicing technology. The hot blast technology is to bring the outside air into the cabin, heat the air and then send the air into the interior of the fan blade to exchange heat with the blade, so that the temperature of the blade rises and exceeds the freezing temperature, and water drops are prevented from freezing on the surface of the blade. The hot blast deicing technology has the advantages of safe structure, easy maintenance and repair and no increase of lightning stroke risk of the wind turbine generator. However, the disadvantage is that the energy consumption is relatively high, and the additionally introduced blower and heater consume a part of the electric energy, which reduces the overall power generation efficiency of the fan. In order to more energy-conservingly utilize the hot blast technology to carry out fan blade deicing, on one hand, the extra loss brought by the fan can be reduced by reducing the dead weight of the fan and the like, and on the other hand, the fan energy can be utilized in a gradient manner by optimizing a reasonable heat transfer scheme, so that the self-power consumption of the fan is reduced, and the power generation efficiency of the whole machine is improved.
The patent with publication number CN110821762A proposes a fan blade deicing system, in which a ventilation duct passes through a middle channel of a fan generator and extends to a fan hub, and a single-layer multi-channel rotary joint in the fan hub is used to realize air volume distribution, thereby better improving energy consumption caused by installing an air blower at the root of a blade and improving fan efficiency. However, it lacks a comprehensive cascade utilization that takes into account the energy inside the wind turbine.
The patent with publication number CN107100803A performs closed-loop linear control on the heater power and the turbine speed of the electric turbocharger, so that the system has lower energy consumption, lower use cost and more uniform heating. But the optimization of extra power consumption brought by the weight of the blower and the comprehensive utilization of the whole energy of the blower cannot be considered.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a pneumatic deicing system for blades of a wind turbine and a working method thereof, which systematically design energy distribution of the whole machine, and realize effective deicing of the blades and cascade utilization of energy of a fan, thereby further realizing maximization of fan efficiency.
The invention is realized by the following technical scheme:
the invention discloses a pneumatic deicing system for blades of a wind turbine generator, which comprises a cooling pipeline, a generator cooling main road, a main road heat exchanger, a generator cooling bypass, a bypass heat exchanger and a deicing pipeline, wherein the main road heat exchanger is arranged on the generator cooling bypass;
an inlet and an outlet of the cooling pipeline are both arranged outside the fan engine room, the cooling pipeline is provided with a cooling pipeline fan, and the cooling pipeline and the generator cooling main path exchange heat in the main path heat exchanger; the generator internal air flow channel and the generator cooling main path, the generator internal air flow channel and the generator cooling bypass respectively form two circulation loops, a generator side fan is arranged on the generator internal air flow channel, and a control valve is arranged on the generator cooling bypass; the generator cooling bypass and the deicing pipeline exchange heat in a bypass heat exchanger, a deicing pipeline fan and a heater are arranged on the deicing pipeline, an inlet of the deicing pipeline is arranged outside a fan cabin, and an outlet of the deicing pipeline is connected with the inside of the blade; the blade is provided with a blade temperature sensor; the generator side fan, the cooling pipeline fan, the deicing pipeline fan, the control valve, the blade temperature sensor and the heater are respectively connected to the control system.
Preferably, a rotary joint is installed in a hub of the wind turbine generator, the rotary joint is communicated with the interior of each blade through an air supply pipeline, and the rotary joint is connected with a deicing pipeline.
Further preferably, each air supply pipeline is provided with a regulating valve, and the regulating valves are connected with the control system.
Preferably, the blade temperature sensor is provided at the tip of the blade.
Preferably, a generator cooling main path temperature sensor is arranged on the generator cooling main path, and the generator cooling main path temperature sensor is connected with the control system.
Preferably, a flow meter is arranged on the generator cooling bypass and is connected with the control system.
Preferably, the main and bypass heat exchangers are plate heat exchangers.
Preferably, the cooling pipeline exchanges heat with the generator cooling main circuit in a countercurrent mode, and the generator cooling bypass exchanges heat with the deicing pipeline in a countercurrent mode.
The invention discloses a working method of the pneumatic deicing system for the blades of the wind turbine generator, which comprises the following steps:
when the temperature measured by the blade temperature sensor is higher than a first preset temperature, the control valve is closed, all air in the air flow channel inside the generator enters the generator cooling main path for cooling, and the cooling pipeline fan operates at rated power, so that the temperature of the air circulating in the generator at the outlet of the main path heat exchanger is maintained at a second preset temperature;
when the temperature measured by the blade temperature sensor is lower than a first preset temperature, the control valve is opened, part of air in an air flow channel inside the generator enters a generator cooling bypass, a deicing pipeline fan is opened, deicing airflow is introduced from the outside to exchange heat with the generator cooling bypass in a bypass heat exchanger, and the deicing airflow enters the interior of the blade after the temperature is increased so as to increase the temperature of the blade; meanwhile, the power of a cooling pipeline fan is reduced, so that the temperature of circulating air in the generator at the outlet of the main path heat exchanger is maintained at a second preset temperature;
when the temperature measured by the blade temperature sensor rises to a third preset temperature, the opening degree of the control valve is reduced, the temperature of the blade is maintained between the first preset temperature and the third preset temperature, and correspondingly, the power of the cooling pipeline fan is increased, so that the temperature of circulating air in the generator at the outlet of the main heat exchanger is maintained at a second preset temperature;
when the environment temperature is too low, the control valve is completely opened, and the temperature measured by the blade temperature sensor is still lower than the first preset temperature, the heater is started, and the temperature of the blade is maintained between the first preset temperature and a third preset temperature;
when the ambient temperature is lower than the first preset temperature, the wind turbine generator is shut down and started, the heater is started, the temperature of the blade is maintained between the first preset temperature and the third preset temperature, after the wind turbine generator runs stably, the power of the heater is gradually reduced until the heater is closed, meanwhile, the opening degree of the control valve is gradually increased, and the temperature of the blade is maintained between the first preset temperature and the third preset temperature.
Preferably, the first preset temperature is freezing point +3 ℃, the second preset temperature is 20-40 ℃, and the third preset temperature is freezing point +5 ℃.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a pneumatic deicing system for blades of a wind turbine generator, which is characterized in that a generator cooling bypass is arranged on the basis of a generator cooling loop of the wind turbine generator. When the fan blades are frozen, part of circulating air in the generator enters the bypass heat exchanger to exchange heat with the deicing airflow. The deicing airflow absorbs partial heat from circulating air in the generator through the heat exchanger, and then is sent to the fan blades to heat the blades, so that the icing phenomenon is prevented. On one hand, the structure of an air blower and a heater which are arranged at the root of each blade in the existing pneumatic deicing device is removed, the dead weight of the blades is greatly reduced, and the energy consumption is reduced. Meanwhile, the generator bypass is introduced for cooling, and the blade pneumatic deicing is carried out by utilizing the bypass heat, so that the cascade utilization of the energy of the wind generating set is realized, and the generating efficiency of the whole machine is improved. In addition, through the measurement of the real-time temperature sensor, the temperatures of the blades and the internal circulating air are fed back in time, the output of the air inlet fan is adjusted in time, the air inlet fan can be prevented from operating under high load for a long time, the energy consumption is saved, and the unit efficiency is improved.
Furthermore, the deicing pipeline sends deicing airflow into the blades through each air supply pipeline on the rotary joint, and the deicing device is simple in structure, light in weight and convenient to maintain daily.
Furthermore, each air supply pipeline is independently controlled by adopting a regulating valve, and when the temperature difference exists between the blades, the flow of the deicing air flow can be respectively regulated, so that the aim of fine control is fulfilled.
Further, the blade temperature sensor is arranged at the blade tip of the blade, and the icing is firstly generated at the blade tip, so that the icing can be timely processed at the blade tip.
Furthermore, a generator cooling main path temperature sensor is arranged on the generator cooling main path, so that the temperature in the generator cooling main path can be monitored in real time, and the adjustment and control are carried out by matching with a control strategy.
Furthermore, a flowmeter is arranged on the generator cooling bypass, so that the gas flow in the generator cooling bypass can be monitored in real time, and the stability of the system is ensured.
Furthermore, as the media for exchanging heat in the main circuit heat exchanger and the bypass heat exchanger are both gas, the heat exchange efficiency of the plate heat exchanger is high.
Furthermore, the cooling pipeline and the generator cooling main circuit perform countercurrent heat exchange, the generator cooling bypass and the deicing pipeline perform countercurrent heat exchange, and the heat exchange efficiency is high.
The working method of the pneumatic deicing system for the blades of the wind turbine generator set, disclosed by the invention, has the advantages that the targeted control strategy refinement is carried out aiming at the running environment of a fan, the energy is fully utilized, the cascade utilization of the energy of the wind turbine generator set is realized, the overall energy consumption of the system is reduced, and the power generation efficiency of the whole machine is improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1-a fan nacelle; 2-a generator; 3-generator internal air flow channel; 4-generator side fan; 5-generator cooling main circuit; 6-main circuit heat exchanger; 7-cooling the pipeline fan; 8-generator cooling bypass; 9-a bypass heat exchanger; 10-deicing pipeline fan; 11-a control valve; 12-a flow meter; 13-deicing airflow; 14-a hub; 15-a rotary joint; 16-an air supply duct; 17-a blade; 18-blade temperature sensor; 19-generator cooling main circuit temperature sensor; 20-a heater; 21-a cooling line; 22-deicing circuit.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings, which are included to illustrate and not to limit the invention:
referring to fig. 1, the pneumatic deicing system for the blades of the wind turbine generator comprises a cooling pipeline 21, a generator cooling main road 5, a main road heat exchanger 6, a generator cooling bypass 8, a bypass heat exchanger 9 and a deicing pipeline 22.
An inlet and an outlet of the cooling pipeline 21 are both arranged outside the fan engine room 1, the cooling pipeline 21 is provided with a cooling pipeline fan 7, and the cooling pipeline 21 and the generator cooling main path 5 exchange heat in the main path heat exchanger 6; the generator internal air flow channel 3 and the generator cooling main path 5, and the generator internal air flow channel 3 and the generator cooling bypass 8 respectively form two circulation loops, the generator internal air flow channel 3 is provided with a generator side fan 4, and the generator cooling bypass 8 is provided with a control valve 11; the generator cooling bypass 8 and the deicing pipeline 22 exchange heat in the bypass heat exchanger 9, the deicing pipeline 22 is provided with a deicing pipeline fan 10 and a heater 20, an inlet of the deicing pipeline 22 is arranged outside the fan cabin 1, and an outlet of the deicing pipeline 22 is connected with the inside of the blade 17; the blade 17 is provided with a blade temperature sensor 18, and the blade temperature sensor 18 is preferably provided near the tip of the blade 17 because icing occurs first at the tip. The generator side fan 4, the cooling pipeline fan 7, the deicing pipeline fan 10, the control valve 11, the blade temperature sensor 18 and the heater 20 are respectively connected to a control system.
In a preferred embodiment of the invention, a rotary joint 15 is mounted in the hub 14 of the wind turbine, the rotary joint 15 is communicated with the inside of each blade 17 through a blast duct 16, and the rotary joint 15 is connected with a deicing pipeline 22. Furthermore, each air supply pipeline 16 is provided with a regulating valve, and the regulating valve is connected with the control system.
In a preferred embodiment of the present invention, a generator cooling main circuit temperature sensor 19 is provided on the generator cooling main circuit 5, and the generator cooling main circuit temperature sensor 19 is connected to the control system. The generator cooling bypass 8 is provided with a flow meter 12, and the flow meter 12 is connected with the control system.
Preferably, the main heat exchanger 6 and the bypass heat exchanger 9 adopt plate heat exchangers, and the heat exchange efficiency of gas-gas is high.
Preferably, the cooling line 21 is in counter-current heat exchange with the main generator cooling circuit 5, and the generator cooling bypass 8 is in counter-current heat exchange with the de-icing line 22.
The specific operation control strategy of the pneumatic deicing system for the blades of the wind turbine generator is as follows:
(1) when the blade temperature sensor 18 at the tip measures a temperature above the freezing point (T)i) At the temperature of 3 ℃, the blade 17 is low in icing risk, and heating for deicing is not needed. The control valve 11 is closed, all the circulating air in the generator enters the generator cooling main path 5 for cooling, the cooling pipeline fan 7 operates at rated power, the circulating air in the generator is cooled by introducing external cold air, and the temperature of the circulating air in the generator at the outlet of the main path heat exchanger 6 is maintained at a reasonable level T0；T0The temperature is generally set to 20 to 40 ℃.
(2) When the ambient temperature is lowered, below the freezing point (T)i) And 3 ℃ above, the fan blade 17 enters an easy-to-freeze region. The blade temperature sensor 18 sends temperature information to the control system, and the opening degree of the control valve 11 is gradually increased through PID closed loop calculation in the control system, so that part of circulating air in the generator enters the generator for coolingThe bypass 8 is cooled.
(3) Meanwhile, the deicing pipeline fan 10 is started, deicing airflow 13 is introduced from the outside, and the deicing airflow 13 exchanges heat with internal circulation air entering the generator cooling bypass 8, so that the temperature is increased.
(4) The deicing air flow 13 is sent to the interior of three fan blades 17 through a rotary joint 15 in the center of a hub 14, and is heated with the blades 17, so that the temperature of the blades 17 is increased.
(5) Due to the opening of the generator cooling bypass 8, the flow rate of the generator internal circulation air on the generator cooling main path 5 is reduced, and the required flow rate of the cooling air is reduced. If the output of the cooling pipeline fan 7 is not changed, the temperature T of the circulating air in the generator at the outlet of the main path heat exchanger 60And decreases. In order to reduce energy consumption, the output of the cooling pipeline fan 7 is correspondingly reduced, so that the temperature T of the circulating air in the generator at the outlet of the heat exchanger 6 is reduced0And maintained unchanged.
(6) When the temperature of the blade tip rises to the freezing point (T)i) After the temperature reaches 5 ℃, the opening degree of the control valve 11 is gradually reduced through calculation of the control system, the flow of the internal circulation air entering the generator cooling bypass 8 is reduced, and the temperature of the blades 17 is maintained at Ti+3℃～Ti+5 ℃. Correspondingly, the output of the cooling pipeline fan 7 is increased, and the T is maintained0And is not changed.
(7) In particular, the following cases require additional introduction of an external heating source for treatment: firstly, when the ambient temperature is too low, the control valve 11 is completely opened, and all the circulating air in the generator enters the generator cooling bypass 8 for cooling, the temperature of the blade temperature sensor 18 is still lower than Ti+3 deg.c, the heater 20 is turned on and the heating power is controlled by the control system so that the tip temperature falls to Ti+3℃～Ti+5 ℃. In this case, when the ambient temperature increases, the power of the heater 20 is first reduced, and then the opening degree of the control valve 11 is closed again. ② when the ambient temperature is lower than Ti+3 ℃, when the engine is stopped and started, the generator is in a stopped state and cannot provide heat, and at the moment, the heater 20 is started, so that the temperature of the blade tip falls to Ti+3℃～TiWithin the interval of +5 ℃, the risk of icing of the blades 17 is eliminated. Step-by-step starting unitThe standby group operates stably, gradually turning off the heater 20 and simultaneously turning on the control valve 11 so that the tip temperature falls to Ti+3℃～TiWithin the interval of +5 ℃.
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 (10)
1. A pneumatic deicing system for blades of a wind turbine generator is characterized by comprising a cooling pipeline (21), a generator cooling main road (5), a main road heat exchanger (6), a generator cooling bypass (8), a bypass heat exchanger (9) and a deicing pipeline (22);
an inlet and an outlet of a cooling pipeline (21) are arranged outside the fan engine room (1), the cooling pipeline (21) is provided with a cooling pipeline fan (7), and the cooling pipeline (21) and the generator cooling main path (5) exchange heat in a main path heat exchanger (6); the generator internal air flow channel (3) and the generator cooling main path (5) as well as the generator internal air flow channel (3) and the generator cooling bypass (8) respectively form two circulation loops, a generator side fan (4) is arranged on the generator internal air flow channel (3), and a control valve (11) is arranged on the generator cooling bypass (8); the generator cooling bypass (8) and the deicing pipeline (22) exchange heat in a bypass heat exchanger (9), a deicing pipeline fan (10) and a heater (20) are arranged on the deicing pipeline (22), an inlet of the deicing pipeline (22) is arranged outside a fan cabin (1), and an outlet of the deicing pipeline (22) is connected with the inside of a blade (17); a blade temperature sensor (18) is arranged on the blade (17); the generator side fan (4), the cooling pipeline fan (7), the deicing pipeline fan (10), the control valve (11), the blade temperature sensor (18) and the heater (20) are respectively connected to a control system.
2. Pneumatic deicing system for blades of a wind turbine according to claim 1, characterized in that a rotary joint (15) is mounted in the hub (14) of the wind turbine, the rotary joint (15) being in communication with the inside of each blade (17) through a supply duct (16), the rotary joint (15) being connected to the deicing duct (22).
3. Pneumatic deicing system for wind turbine blades according to claim 2, characterized in that each supply duct (16) is provided with a regulating valve, which is connected to a control system.
4. Pneumatic deicing system for wind turbine blades according to claim 1, characterized in that the blade temperature sensor (18) is provided at the tip of the blade (17).
5. Pneumatic deicing system for wind turbine blades according to claim 1, characterized in that a generator main cooling path temperature sensor (19) is provided on generator main cooling path (5), and generator main cooling path temperature sensor (19) is connected to the control system.
6. Pneumatic deicing system for wind turbine blades according to claim 1, characterized in that a flow meter (12) is provided on the generator cooling bypass (8), the flow meter (12) being connected to the control system.
7. Pneumatic deicing system for wind turbine blades according to claim 1, characterized in that the main circuit heat exchanger (6) and the bypass heat exchanger (9) are plate heat exchangers.
8. Pneumatic deicing system for wind turbine blades according to claim 1, characterized in that the cooling circuit (21) is in countercurrent heat exchange with the main generator cooling circuit (5) and the bypass generator cooling circuit (8) is in countercurrent heat exchange with the deicing circuit (22).
9. The working method of the pneumatic deicing system for the blades of the wind turbine generator set according to any one of claims 1 to 8, comprising:
when the temperature measured by the blade temperature sensor (18) is higher than a first preset temperature, the control valve (11) is closed, all air in the internal air flow channel (3) of the generator enters the main cooling path (5) of the generator for cooling, and the cooling pipeline fan (7) operates at rated power, so that the temperature of the circulating air in the generator at the outlet of the main path heat exchanger (6) is maintained at a second preset temperature;
when the temperature measured by the blade temperature sensor (18) is lower than a first preset temperature, the control valve (11) is opened, part of air in the internal air channel (3) of the generator enters the generator cooling bypass (8), the deicing pipeline fan (10) is opened, deicing airflow is introduced from the outside to exchange heat with the generator cooling bypass (8) in the bypass heat exchanger (9), and the deicing airflow enters the blades (17) after the temperature is increased, so that the temperature of the blades (17) is increased; meanwhile, the power of a cooling pipeline fan (7) is reduced, so that the temperature of circulating air in the generator at the outlet of the main heat exchanger (6) is maintained at a second preset temperature;
when the temperature measured by the blade temperature sensor (18) rises to a third preset temperature, the opening degree of the control valve (11) is reduced, the temperature of the blade (17) is maintained between the first preset temperature and the third preset temperature, and correspondingly, the power of the cooling pipeline fan (7) is increased, so that the temperature of the circulating air in the generator at the outlet of the main heat exchanger (6) is maintained at a second preset temperature;
when the ambient temperature is too low, the control valve (11) is completely opened, and the temperature measured by the blade temperature sensor (18) is still lower than the first preset temperature, the heater (20) is opened, the temperature of the blade (17) is maintained between the first preset temperature and a third preset temperature, in this case, if the ambient temperature is increased, the power of the heater (20) is firstly reduced, and then the opening degree of the control valve (11) is reduced;
when the ambient temperature is lower than a first preset temperature, the wind turbine generator is stopped and started, the heater (20) is started, the temperature of the blade (17) is maintained between the first preset temperature and a third preset temperature, after the wind turbine generator runs stably, the power of the heater is gradually reduced until the blade is closed, and meanwhile, the opening degree of the control valve (11) is gradually increased, so that the temperature of the blade (17) is maintained between the first preset temperature and the third preset temperature.
10. The working method of the pneumatic deicing system for the blades of the wind turbine generator set according to claim 9, wherein the first preset temperature is freezing point +3 ℃, the second preset temperature is 20-40 ℃, and the third preset temperature is freezing point +5 ℃.
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| CN202110160790.XA CN112832961B (en) | 2021-02-05 | 2021-02-05 | Pneumatic deicing system for blades of wind turbine generator and working method of pneumatic deicing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113623149A (en) * | 2021-07-26 | 2021-11-09 | 西安交通大学 | Wind power blade efficient ice melting system utilizing water latent heat |
| CN115839320A (en) * | 2023-02-23 | 2023-03-24 | 国网江西省电力有限公司电力科学研究院 | Wind power blade deicing control method and system |
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| CA2433072A1 (en) * | 2002-06-28 | 2003-12-28 | High Technology Investments B.V. | Wind generator unit with high energy yield |
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