CN111734583B - Accurate in-place installation method for wind power generation large-elevation impeller - Google Patents
Accurate in-place installation method for wind power generation large-elevation impeller Download PDFInfo
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- CN111734583B CN111734583B CN202010360766.6A CN202010360766A CN111734583B CN 111734583 B CN111734583 B CN 111734583B CN 202010360766 A CN202010360766 A CN 202010360766A CN 111734583 B CN111734583 B CN 111734583B
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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
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
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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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- General Engineering & Computer Science (AREA)
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Abstract
A wind power generation large elevation impeller accurate in-place mounting method comprises the following steps: mounting three blades to a hub; according to the wind condition and the fan impeller parameter, the lower blades are adjusted to the wind abandoning position through the variable pitch operation, so that the stress conditions of the two upper blades are equal, the balance is kept, and no deflection occurs; the fan impeller is hoisted to a butt joint position with the fan main machine through a hoisting tool; carrying out secondary pitch variation, and finely adjusting the angles of the two upper blades to enable the upper elevation angle of the fan impeller to be consistent with the upper elevation angle of the fan main engine; and after butt joint positioning, connecting the fan impeller and the main engine together, and finishing installation. The method can dynamically adjust the angle of the paddle according to the instant wind speed so that the fan impeller does not deflect, realizes the quick butt joint installation of the fan impeller and the fan main engine, and has the characteristics of simple steps, high efficiency and high safety.
Description
Technical Field
The invention relates to the technical field of wind power generation equipment, in particular to a method for accurately positioning and mounting a wind power generation large-elevation impeller.
Background
With the development of wind power technology, the blade wind capturing technology is changed day by day, the structures of a fan tower and a fan body are optimized day by day, and domestic fan manufacturers gradually research and develop a semi-direct-drive high-power fan with a large upper elevation angle; however, the hoisting points, the hoists and the tools provided by the fan manufacturers cannot meet the impeller butt joint requirement in the actual fan installation process, and the practice of Shandong Zhanhua wind power projects proves that the impeller butt joint time is about 5 hours by adopting the conventional butt joint technology, and the hoisting and installation risk of large high-altitude heavy objects is high under the condition of unknown wind conditions.
Therefore, the conventional impeller butt joint installation method has the technical problems of difficult installation, long time consumption and high risk.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method for accurately positioning and mounting a wind power generation large-elevation impeller, which can dynamically adjust the angle of a blade according to the instant wind speed so as to prevent the fan impeller from deflecting, realize the quick butt joint mounting of the fan impeller and a fan main engine, and has the characteristics of simple steps, high efficiency and high safety.
In order to achieve the purpose, the invention adopts the technical scheme that: the method for accurately positioning and mounting the wind power generation large-elevation impeller is characterized by comprising the following steps of:
step 1) blade formation and pitch control preparation: three blades of the fan impeller are arranged on a hub of the air inlet fan impeller on a ground mounting field in a way that a main lifting appliance and an auxiliary lifting appliance are matched, a generator set is respectively configured on the ground and a fan host machine to serve as a power supply for changing the blades, a blade changing module is arranged in the hub, the blade changing module is tested, and blade changing preparation is completed;
step 2) pitch control: a ground generator is adopted to drive a variable pitch module, the lower blades are adjusted to a wind abandoning position, and simultaneously, the blade angles of the two upper blades are calculated and adjusted according to the instant wind direction, the wind speed, the impeller parameters and the blade parameters, so that the stress conditions of the two upper blades are equal, and the two upper blades are kept balanced and do not deflect;
step 3) lifting and initially positioning an impeller: lifting the fan impeller and gradually turning over and lifting the fan impeller to the ground by adopting a lifting mode that a main lifting sling and an auxiliary lifting sling are matched, removing the auxiliary lifting sling after the tail tip of the lower blade leaves the ground and reaches a safe distance, and independently lifting the lifted fan impeller to a position butted with a fan main machine by the main lifting sling;
step 4), fine adjustment of blade angle: after the fan impeller reaches the primary position, implementing secondary pitch control, adopting a generator on a fan host to drive a pitch control module, calculating and adjusting blade angles of the two upper blades according to the instant wind direction, the wind speed, the impeller parameters and the blade parameters, so that the stress conditions of the two upper blades are equal, the balance is kept and no deflection occurs, and meanwhile, in the process of adjusting the blade angles, the upper elevation angle of the fan impeller and the upper elevation angle of the fan host are visually observed and adjusted until the upper elevation angles of the two blades are consistent;
step 5), accurately positioning an impeller: the hub of the fan impeller is in butt joint positioning with the fan host through the main lifting sling, and then the fan impeller and the fan host are connected and fastened through bolts.
As a further improvement of the invention, in the step 1), a 50kw diesel generator set is adopted as a power supply for pitch control.
As a further improvement of the invention, in step 2), before adjusting the blade angle of the blade, the wind speed on the main crane sling is read, and the wind pressure and the eccentric weight and the eccentric distance of different blade angles are calculated by combining the wind receiving areas at different angles.
As a further improvement of the invention, in the step 2) and the step 4), the blade angle alpha is calculated according to the formula
Calculating, wherein P is the total pressure of the blade at different blade angles, and A is the wind area m of the blade2,
Taking 0-6 m/s as the instant wind speed, and taking G as the dead weight of the blade.
As a further improvement of the invention, in step 3), when the impeller is lifted, the main lifting sling pulls the upper installation part of the hub of the fan impeller, and the auxiliary lifting sling pulls the tail part of the lower blade to keep the overall balance.
As a further improvement of the invention, in step 5), the hub of the fan impeller and the fan main unit are butted and positioned through the combined actions of rotation of the main lifting sling, the reversing rake rod and lifting and descending, then the fan impeller and the fan main unit are connected and fastened by bolts by adopting a method of jumping holes up and down, left and right, and then arranging the inner ring and the outer ring.
As a further improvement of the invention, an anemometer is arranged on the main crane sling, and the instant wind speed is read by the anemometer.
The invention has the beneficial effects that:
firstly, a set of standard and effective process flow is formed. The method can dynamically adjust the angle of the blade through the variable pitch according to the wind condition of an installation place, so that the gravity center of the fan impeller deviates within a calculation range, the blade is prevented from deflecting, the fan impeller is in an elevation angle posture, the fan impeller and the host computer are quickly butted and installed, the quick butting and installation of the fan impeller and the host computer can be completed within two hours as long as the wind speed is less than 6m/s, the gravity center of the fan impeller is changed through the variable pitch operation in the hoisting process to achieve balance, the method does not need the assistance of large-scale auxiliary hoisting equipment, and is simple, convenient, rapid and effective.
And secondly, the risk is reduced, and safety and controllability are realized. In the process of installing the fan, the fan impeller is large in size, greatly influenced by wind, the object is the heaviest, and the safety risk of high-altitude operation is the greatest.
And thirdly, calculating and adjusting the blade angles of the two upper blades according to the instant wind direction, the instant wind speed, the instant impeller parameters and the instant blade parameters by adopting a balance principle and a simple principle of wind mechanics of the blades of the fan, so that the two upper blades are balanced.
Fourthly, the popularization is strong. The wind power generation method can be applied to elevation fans on land, avoids the influence of wind power on installation or by using variable pitch in the hoisting process, can also be applied to installation and maintenance of high-capacity offshore wind power, and is high in applicability.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The method aims at a quick butt joint method of a main shaft and an impeller of a semi-direct-drive large-elevation fan, meets the self-repairing and self-maintaining requirements of wind power generation in the installation and operation periods, and comprises the following specific implementation processes:
step 1) blade formation and pitch control preparation: three blades of the fan impeller are arranged in a wheel hub human blade mounting hole of the fan impeller on a ground mounting field in a way that a main lifting sling and an auxiliary lifting sling are matched, and when one blade is arranged, one auxiliary lifting sling is used for traction to keep the integral balance; respectively configuring a 50kw generator set as a power supply for variable pitch on the ground and a fan host, installing a variable pitch module in a hub, testing the variable pitch module, and completing preparation for variable pitch;
step 2) pitch control: the main lifting appliance is provided with an anemoscope, the wind speed on the main lifting appliance before variable pitch is read, and the wind pressure and the eccentric weight and the eccentric distance of different blade angles are calculated by combining the wind receiving areas at different angles. The method comprises the steps of connecting a ground generator and a related signal circuit on a ground installation site, driving a variable pitch module by the ground generator, adjusting the lower blades to a wind abandoning position, calculating and adjusting blade angles of the upper two blades according to the instant wind direction, the wind speed, the impeller parameters and the blade parameters on a main crane sling, adjusting the upper two blades to a proper windward angle, enabling stress conditions of the upper two blades to be equal, keeping balance and avoiding deflection. Blade angle alpha according to the formula
Calculating, wherein P is that the blade is notThe total pressure applied to the same blade angle, A is the wind area m of the blade2,
Taking the wind speed as the instant wind speed, and taking 0-6 m/s, wherein G is the dead weight of the blade;
step 3) lifting and initially positioning an impeller: the fan impeller is lifted and gradually turned over and lifted off the ground by adopting a lifting mode that a main lifting sling and an auxiliary lifting sling are matched, when the impeller is lifted, the main lifting sling pulls the upper mounting part of the hub of the fan impeller, and the auxiliary lifting sling pulls the tail part of the lower paddle to keep the integral balance. The tail tip of the lower blade leaves the ground and reaches a safe distance, then the auxiliary lifting sling is released, and the main lifting sling independently lifts the raised fan impeller to a position in butt joint with the fan main machine;
step 4), fine adjustment of blade angle: after the fan impeller reaches the initial position, implementing secondary pitch control, adopting a generator on a fan host to drive a pitch control module, adopting a calculation formula in the step 2), calculating and adjusting blade angles of the two upper blades according to the instant wind direction, wind speed, impeller parameters and blade parameters on a main lifting sling, so that the stress conditions of the two upper blades are equal, keeping balance and avoiding deflection, meanwhile, in the process of adjusting the blade angles, the fan impeller integrally forms an elevation angle, and the elevation angle of the fan impeller and the elevation angle of the fan host are visually observed in a cabin and adjusted to be consistent;
step 5), accurately positioning an impeller: the hub of the fan impeller and the fan host are butted and positioned through the combined actions of the rotation of the main lifting appliance, the reversing rake rod and the lifting and descending, then the fan impeller and the fan host are connected and fastened by bolts by adopting a method of jumping holes up and down, left and right, and firstly adopting an inner ring and then adopting an outer ring.
The above-mentioned embodiments are only for convenience of illustration and not intended to limit the invention in any way, and those skilled in the art will be able to make equivalents of the features of the invention without departing from the technical scope of the invention.
Claims (7)
1. A wind power generation large elevation impeller accurate positioning and mounting method is characterized by comprising the following steps:
step 1) blade formation and pitch control preparation: three blades of the fan impeller are arranged on a hub of the air inlet fan impeller on a ground mounting field in a way that a main lifting appliance and an auxiliary lifting appliance are matched, a generator set is respectively configured on the ground and a fan host machine to serve as a power supply for changing the blades, a blade changing module is arranged in the hub, the blade changing module is tested, and blade changing preparation is completed;
step 2) pitch control: a ground generator is adopted to drive a variable pitch module, the lower blades are adjusted to a wind abandoning position, and simultaneously, the blade angles of the two upper blades are calculated and adjusted according to the instant wind direction, the wind speed, the impeller parameters and the blade parameters, so that the stress conditions of the two upper blades are equal, and the two upper blades are kept balanced and do not deflect;
step 3) lifting and initially positioning an impeller: lifting the fan impeller and gradually turning over and lifting the fan impeller to the ground by adopting a lifting mode that a main lifting sling and an auxiliary lifting sling are matched, removing the auxiliary lifting sling after the tail tip of the lower blade leaves the ground and reaches a safe distance, and independently lifting the lifted fan impeller to a position butted with a fan main machine by the main lifting sling;
step 4), fine adjustment of blade angle: after the fan impeller reaches the primary position, implementing secondary pitch control, adopting a generator on a fan host to drive a pitch control module, calculating and adjusting blade angles of the two upper blades according to the instant wind direction, the wind speed, the impeller parameters and the blade parameters, so that the stress conditions of the two upper blades are equal, the balance is kept and no deflection occurs, and meanwhile, in the process of adjusting the blade angles, the upper elevation angle of the fan impeller and the upper elevation angle of the fan host are visually observed and adjusted until the upper elevation angles of the two blades are consistent;
step 5), accurately positioning an impeller: the hub of the fan impeller is in butt joint positioning with the fan host through the main lifting sling, and then the fan impeller and the fan host are connected and fastened through bolts.
2. The method for accurately positioning and installing the wind power generation high-elevation impeller according to claim 1, wherein the method comprises the following steps: in the step 1), a 50kw diesel generator set is adopted as a power supply for variable pitch.
3. The method for accurately positioning and installing the wind power generation high-elevation impeller according to claim 1, wherein the method comprises the following steps: in the step 2), before the blade angle of the blade is adjusted, the wind speed on the main lifting appliance is read, and the wind pressure and the eccentric weight and the eccentric distance of different blade angles are calculated by combining the wind receiving areas at different angles.
4. The method for accurately positioning and installing the wind power generation high-elevation impeller according to claim 1, wherein the method comprises the following steps: in step 2) and step 4), the blade angle alpha is according to the formula
Calculating, wherein P is the total pressure of the blade at different blade angles, and A is the wind area m of the blade2,
Taking 0-6 m/s as the instant wind speed, and taking G as the dead weight of the blade.
5. The method for accurately positioning and installing the wind power generation high-elevation impeller according to claim 1, wherein the method comprises the following steps: and 3) when the impeller is lifted, the main lifting sling pulls the upper installation part of the hub of the fan impeller, and the auxiliary lifting sling pulls the tail part of the lower blade to keep integral balance.
6. The method for accurately positioning and installing the wind power generation high-elevation impeller according to claim 1, wherein the method comprises the following steps: and step 5), through the combined actions of rotation of the main lifting appliance, the reversing rake rod and lifting and descending, the hub of the fan impeller is in butt joint with the fan host, then the fan impeller and the fan host are connected and fastened by bolts by adopting a method of jumping holes up and down, left and right, and firstly adopting an inner ring and then adopting an outer ring.
7. The method for accurately positioning and installing the wind power generation high-elevation impeller according to claim 1, wherein the method comprises the following steps: an anemoscope is installed on the main lifting appliance, and the instant wind speed is read through the anemoscope.
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