CN109751180B - Blade type selection method of double-impeller fan - Google Patents
Blade type selection method of double-impeller fan Download PDFInfo
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- CN109751180B CN109751180B CN201711065282.3A CN201711065282A CN109751180B CN 109751180 B CN109751180 B CN 109751180B CN 201711065282 A CN201711065282 A CN 201711065282A CN 109751180 B CN109751180 B CN 109751180B
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a blade type selection method of a double-impeller fan, which comprises the steps of determining the installed total capacity of a wind power plant; acquiring wind power data at a plurality of preset position coordinates; determining the installed capacities of the fans at the preset position coordinates according to the installed total capacity and the wind power data at the preset position coordinates; and determining the length of the blade according to the installed capacity of each fan, the wind power data and the electricity consumption cost at the position coordinate, wherein the length of the blade of the primary impeller is more than 2 times of the length of the blade of the secondary impeller.
Description
The technical field is as follows:
the invention belongs to the technical field of wind power generation, and particularly relates to a blade type selection method of a double-impeller fan.
Background art:
along with the rapid expansion of the installed scale of wind turbines in various countries in the world, the single machine capacity of the mainstream wind turbine is continuously increased. How to more reasonably select the type of the wind turbine generator is to ensure that the fan arrangement is more reasonable, the power on the grid is more increased, and the investment is more saved, which becomes a subject which is increasingly emphasized by researchers at home and abroad at present.
The single-impeller fan has limited utilization efficiency of wind energy, the generating efficiency can be indirectly adjusted only by adjusting the angle and the length of the blades, the double-impeller fan can effectively improve the wind energy utilization rate by selecting the primary impeller and the secondary impeller according to different wind directions, and the double-impeller fan has incomparable advantages compared with the single-impeller fan, so that the double-impeller fan with a reasonable structure is very necessary to design. In addition, the double-impeller fan blade is a shutdown component for converting wind energy of the fan, and under the condition of the same capacity, the length of the blade is a key parameter influencing the generating capacity of a wind power plant. Longer blades mean greater wind energy absorption efficiency, but also increase fan cost and wake effects. Therefore, under the condition of a given installed capacity of the wind power plant, how to select a reasonable blade length and reduce the power consumption cost of the wind power plant is also one of the main problems of the construction of the double-impeller fan wind power plant.
The invention content is as follows:
the invention aims to provide a double-impeller fan and a corresponding blade type selection method thereof, so that the structure of the double-impeller fan is optimized, and the power consumption cost of a wind power plant mainly comprising the double-impeller fan is minimized.
The invention is implemented by the following technical scheme:
a blade type selection method of a double-impeller fan, wherein the double-impeller fan comprises the following steps:
the first-stage impeller, the second-stage impeller and the impeller rotating speed combining mechanism; the impeller rotating speed merging mechanism is provided with a first input shaft, a second input shaft, a first output shaft and a second output shaft, the first-stage impeller is in driving connection with the first input shaft, the second-stage impeller is in driving connection with the second input shaft, the first output shaft is in driving connection with the input shaft of the first generator through a first clutch, and the second output shaft is in driving connection with the input shaft of the second generator through a second clutch;
the first-stage impeller is coaxially connected with the second-stage impeller, the length of blades of the first-stage impeller is greater than that of blades of the second-stage impeller, the rotating directions of the first-stage impeller and the second-stage impeller are opposite during working, and the first-stage impeller is positioned in front of the second-stage impeller;
the impeller rotating speed combining mechanism comprises a sun gear, a gear ring and a planet carrier which are coaxially arranged, a plurality of planet gears are arranged on the planet carrier, the gear ring is provided with inner teeth and outer teeth, the planet gears are meshed between the inner teeth of the gear ring and the sun gear, a driving gear is arranged on the first input shaft and is meshed with the outer teeth of the gear ring, the second input shaft is connected with a rotating shaft of the sun gear, the rotating shaft of the planet carrier is in driving connection with an output shaft through an intermediate shaft, one end of the output shaft forms the first output shaft, and the other end of the output shaft forms the second output shaft;
the blade type selection method specifically comprises the following steps:
determining the installed total capacity of the wind power plant;
acquiring wind power data at a plurality of preset position coordinates;
determining the installed capacities of the fans at the preset position coordinates according to the installed total capacity and the wind power data at the preset position coordinates;
and determining the length of the blade according to the installed capacity of each fan, the wind power data and the electricity consumption cost at the position coordinate, wherein the length of the blade of the primary impeller is more than 2 times of the length of the blade of the secondary impeller.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a wind turbine according to an embodiment;
FIG. 2 is a schematic diagram of an impeller speed consolidation mechanism in one embodiment;
FIG. 3 is a flow chart of a blade type selection method according to an embodiment.
The reference numbers are as follows: 1 first-stage impeller, 2 second-stage impeller, 31 first input shaft, 32 second input shaft, 41 first output shaft, 42 second output shaft, 51 sun gear, 52 gear ring, 53 planet carrier, 54 planet gear, 55 driving gear and 6 intermediate shaft
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, in order to further reduce the electricity consumption cost and optimize the mechanism of the double-impeller wind turbine, a double-impeller wind power generator is provided, which comprises: the first-stage impeller 1, the second-stage impeller 2 and the impeller rotating speed combining mechanism; the impeller rotating speed combining mechanism is provided with a first input shaft 31, a second input shaft 32, a first output shaft 41 and a second output shaft 42, the primary impeller 1 is in driving connection with the first input shaft 31, the secondary impeller 2 is in driving connection with the second input shaft 32, the first output shaft 41 is in driving connection with an input shaft of a first generator through a first clutch, and the second output shaft 42 is in driving connection with an input shaft of a second generator through a second clutch.
The first-stage impeller 1 is coaxially connected with the second-stage impeller 2, the length of the blade of the first-stage impeller 1 is larger than that of the blade of the second-stage impeller 2, the rotating directions of the first-stage impeller 1 during working are opposite, and the first-stage impeller 1 is located in front of the second-stage impeller 2.
When the wind turbine works, airflow firstly passes through the first-stage impeller 1 and then passes through the second-stage impeller 2, and the diameter of the second-stage impeller 2 is smaller than that of the first-stage impeller 1, so that the lowest wind speed required by the work of the second-stage impeller 2 is also smaller than that of the first-stage impeller 1. In order to increase the stability of the machine head during operation, the primary impeller 1 and the secondary impeller 2 rotate in opposite directions, so that the torque is offset.
The impeller rotating speed combining mechanism can combine the rotating speeds of the first-stage impeller 1 and the second-stage impeller 2, so that a larger output rotating speed is obtained, the generator is driven to work, the residual wind energy is effectively utilized, and the generating efficiency is improved.
Impeller rotational speed merges mechanism includes sun gear 51, ring gear 52 and the planet carrier 53 of coaxial setting, be equipped with a plurality of planet wheels 54 on the planet carrier 53, ring gear 52 is equipped with internal tooth and external tooth, planet wheel 54 meshes the internal tooth of ring gear 52 with between the sun gear 51, first input shaft 31 is equipped with drive gear 55, drive gear 55 with the external tooth meshing of ring gear 52, second input shaft 32 with sun gear 51's pivot is connected, the pivot of planet carrier 53 is passed through jackshaft 6 and is connected with the output shaft drive, the one end of output shaft forms first output shaft 41, the other end forms second output shaft 42.
For example, the rotation speed of the sun gear 51 is n1, the rotation speed of the ring gear 52 is n2, the rotation speed of the carrier 53 is n3, the tooth number ratio of the internal teeth of the ring gear 52 to the sun gear 51 is a, and n3 is (n1+ a × n2)/(1+ a). Thereby realizing the superposition of the rotating speed and the moment.
In this embodiment, the length of the blades of the first-stage impeller is 75m, and the length of the blades of the second-stage impeller is 35 m. Under the condition that one generator works, when only one primary impeller works, the starting wind speed of the fan is 4m/s, the rated wind speed is 15m/s, the safe wind speed is 25m/s and the rated power is 3MW, and when only one secondary impeller works, the starting wind speed of the fan is 3m/s, the rated wind speed is 10m/s, the safe wind speed is 25m/s and the rated power is 1.5 MW.
Since the energy loss is large and the power is low in the operation of the first impeller in the low wind speed operation, two thresholds are involved in the control of the wind turbine, the first threshold being 6m/s and the second threshold being 10m/s, in order to enable the wind turbine to adapt to wind speeds in a wide range and to effectively utilize wind resources.
The specific control method comprises the following steps: and obtaining the wind speed, and when the wind speed is less than a first threshold value, changing the pitch of the blades of the first-stage impeller 1 and the second-stage impeller 2 to enable the first-stage impeller 1 to stop generating power, enabling the second-stage impeller 2 to be in a rotating power generation state, enabling the first clutch to be in a meshing state, and enabling the second clutch to be in a separation state. Therefore, the fan is started to generate power at low wind speed, the internal consumption of the fan in the power generation process is reduced, and the power generation efficiency is improved.
When the wind speed is not less than the first threshold value and not more than the second threshold value, blades of the first-stage impeller 1 and the second-stage impeller 2 are changed into the pitch, so that the first-stage impeller 1 and the second-stage impeller 2 are both in a rotating power generation state, the first clutch is in a meshing state, and the second clutch is in a separating state. Thereby, high power generation is performed through the first impeller, and the surplus wind energy is effectively utilized through the second impeller. In this mode, the maximum power of the fan can reach 4 MW.
When the wind speed is greater than the second threshold value, the first-stage impeller 1 and the second-stage impeller 2 are both in a rotating power generation state, and the first clutch and the second clutch are both in an engaged state. When the wind speed greatly exceeds the rated wind speed 10m/s required by a single generator, the two generators are used for generating power simultaneously, the maximum generating power can reach 8MW, wind energy can be effectively utilized, the generating power is improved, the diameter of an impeller cannot be increased, the blades are prevented from being too long, and the manufacturing, transporting and installing and maintaining costs are increased.
Because the diameter of the primary impeller 1 is large, when the wind power is smaller than a first threshold value, the primary impeller 1 cannot be driven to rotate, the blades of the primary impeller 1 are adjusted, the windward area is reduced, airflow passes through the primary impeller 1, the secondary impeller 2 is directly driven to rotate, and in order to reduce the starting wind speed, the second clutch is in a separation state, and only the first generator works.
When the wind power is increased to a first threshold value and a second threshold value, the first impeller also starts to rotate, the second impeller effectively utilizes the residual wind energy, and the rotating speeds of the first impeller and the second impeller are superposed by the impeller rotating speed combining mechanism to drive the first generator to work.
When the wind power is continuously increased to be larger than the second threshold value, the rotating speed of the impeller cannot be infinitely increased, but the driving force is increased, the second clutch is engaged, and the first generator and the second generator are driven to generate electricity at the same time, so that the generating efficiency is improved.
Compared with the traditional single-blade blower, the wind driven generator provided by the embodiment has higher blower efficiency, so that the generated energy of a wind field is improved, and the electricity consumption cost is reduced.
Another embodiment provides a method S100 for selecting a blade type of the dual impeller fan, which is described above with reference to fig. 3. The method S100 includes:
step S101: determining the installed total capacity of the wind power plant;
step S102: wind data is acquired at a plurality of predetermined position coordinates including wind speed, direction, wind duration, and the like.
Step S103: and determining the installed capacities of the fans at the preset position coordinates according to the installed total capacity and the wind power data at the preset position coordinates, and specifically determining that the installed capacities of the individual fans can be reasonably distributed by process engineers according to the specific wind power data and the total installed capacity through technical experiences in the technical field, wherein the technical experiences belong to common technical common knowledge in the field and are not described herein again.
Step S104: and determining the length of the blade according to the installed capacity of each fan, the wind power data at the position coordinate and the expected electricity cost, wherein a specific determination mode has a mature algorithm in the field and is not described herein any more. However, a lot of experiments by the inventor show that when the length of the blade of the first-stage impeller is more than 2 times of the length of the blade of the second-stage impeller, the blade wake effect of the double-impeller fan in the previous embodiment can be minimized, the power generation efficiency is the highest, and the double-impeller fan belongs to the optimal implementation mode.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (1)
1. A blade type selection method of a double-impeller fan is characterized by comprising the following steps:
the double-impeller fan includes:
the first-stage impeller, the second-stage impeller and the impeller rotating speed combining mechanism; the impeller rotating speed merging mechanism is provided with a first input shaft, a second input shaft, a first output shaft and a second output shaft, the first-stage impeller is in driving connection with the first input shaft, the second-stage impeller is in driving connection with the second input shaft, the first output shaft is in driving connection with the input shaft of the first generator through a first clutch, and the second output shaft is in driving connection with the input shaft of the second generator through a second clutch;
the first input shaft is parallel to the second input shaft, the first-stage impeller is connected with the second-stage impeller in a non-coaxial mode, the length of blades of the first-stage impeller is larger than that of the blades of the second-stage impeller, the rotating directions of the first-stage impeller and the second-stage impeller are opposite during working, and the first-stage impeller is located in front of the second-stage impeller;
the impeller rotating speed combining mechanism comprises a sun gear, a gear ring and a planet carrier which are coaxially arranged, a plurality of planet gears are arranged on the planet carrier, the gear ring is provided with inner teeth and outer teeth, the planet gears are meshed between the inner teeth of the gear ring and the sun gear, a driving gear is arranged on the first input shaft and is meshed with the outer teeth of the gear ring, the second input shaft is connected with a rotating shaft of the sun gear, the rotating shaft of the planet carrier is in driving connection with an output shaft through an intermediate shaft, one end of the output shaft forms the first output shaft, and the other end of the output shaft forms the second output shaft;
the blade type selection method specifically comprises the following steps:
determining the installed total capacity of the wind power plant;
acquiring wind power data at a plurality of preset position coordinates;
determining the installed capacities of the fans at the preset position coordinates according to the installed total capacity and the wind power data at the preset position coordinates;
and determining the length of the blade according to the installed capacity of each fan, the wind power data and the electricity consumption cost at the position coordinate, wherein the length of the blade of the primary impeller is more than 2 times of the length of the blade of the secondary impeller.
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| CN201711065282.3A CN109751180B (en) | 2017-11-02 | 2017-11-02 | Blade type selection method of double-impeller fan |
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| CN201711065282.3A CN109751180B (en) | 2017-11-02 | 2017-11-02 | Blade type selection method of double-impeller fan |
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| CN109751180A CN109751180A (en) | 2019-05-14 |
| CN109751180B true CN109751180B (en) | 2020-07-14 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072094A (en) * | 2010-12-02 | 2011-05-25 | 岑益南 | Wind driven generator with double wind wheels with power synthesis |
| CN203114522U (en) * | 2013-03-17 | 2013-08-07 | 南京风电科技有限公司 | Efficient and reliable wind power generation device |
| CN106503341A (en) * | 2016-10-31 | 2017-03-15 | 上海电力学院 | A kind of wind electric field blower blade Lectotype Optimization method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101205329B1 (en) * | 2010-06-11 | 2012-11-28 | 신익 | Wind Power Generator Having Triple Rotors Integrated System |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072094A (en) * | 2010-12-02 | 2011-05-25 | 岑益南 | Wind driven generator with double wind wheels with power synthesis |
| CN203114522U (en) * | 2013-03-17 | 2013-08-07 | 南京风电科技有限公司 | Efficient and reliable wind power generation device |
| CN106503341A (en) * | 2016-10-31 | 2017-03-15 | 上海电力学院 | A kind of wind electric field blower blade Lectotype Optimization method |
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Effective date of registration: 20201126 Address after: 100052, 8 floor, No. 1 Caishikou Avenue, Beijing, Xicheng District, 801-03 Patentee after: BEIJING TANGHAO POWER ENGINEERING TECHNOLOGY RESEARCH Co.,Ltd. Address before: 102199 No. 1363 Kangxi Road, Badaling Economic Development Zone, Yanqing District, Beijing Patentee before: BEIJING PUHUA YINENG WIND POWER TECHNOLOGY Co.,Ltd. |