阅读说明：本技术 双机头风电机组及其运行方法 (Double-machine-head wind turbine generator set and operation method thereof ) 是由 王康世 许移庆 王坤鹏 于 2021-09-01 设计创作，主要内容包括：本发明公开了一种双机头风电机组及其运行方法,其包括有机组和塔架,所述机组的数量为两个,所述塔架上安装有支撑所述机组的支撑梁,所述机组分别安装在所述支撑梁的两端,两个所述机组的叶片之间相互错开,两个所述机组的中心距离大于所述机组的叶轮半径且小于所述机组的叶轮直径。通过设置机组在支撑梁上的位置更接近支撑梁和塔架的连接点,使机组的叶片扫风面积在空间上有部分重叠区域,从而减小机组在支撑梁上产生的力矩,提高支撑梁的支撑效果,同时,双机头可以共用部分设备,减少设备和机位点的数量,节约成本。(The invention discloses a double-head wind turbine generator set and an operation method thereof, wherein the double-head wind turbine generator set comprises two generator sets and towers, support beams for supporting the generator sets are arranged on the towers, the generator sets are respectively arranged at two ends of each support beam, blades of the two generator sets are staggered with each other, and the central distance between the two generator sets is greater than the radius of impellers of the generator sets and smaller than the diameter of the impellers of the generator sets. The position of the unit on the supporting beam is closer to the connecting point of the supporting beam and the tower, so that the blade wind sweeping area of the unit is partially overlapped in space, the moment generated by the unit on the supporting beam is reduced, the supporting effect of the supporting beam is improved, meanwhile, partial equipment can be shared by the double heads, the quantity of the equipment and the machine position points is reduced, and the cost is saved.)

1. The utility model provides a duplex locomotive wind-powered electricity generation unit, its includes unit and pylon, the quantity of unit is two, install on the pylon and support a supporting beam of unit, its characterized in that, the unit is installed respectively the both ends of a supporting beam, two stagger each other between the blade of unit, two the center distance of unit is greater than the impeller radius of unit just is less than the impeller diameter of unit.

2. The twin-head wind turbine generator system of claim 1, wherein the blades of both said units are respectively distributed on the front and rear sides of said support beam.

3. The twin-head wind turbine as defined in claim 1, further comprising a control system for controlling the rotational speed of said impeller, said support beam being rotatable about the axis of said tower.

4. The double-head wind turbine generator system according to claim 1 or 3, wherein a transition flange is connected to the tower, a sliding sleeve nested with the transition flange is connected to the support beam, the sliding sleeve and the transition flange are of a circular sleeve structure, and the sliding sleeve can rotate relative to the transition flange.

5. The twin-head wind turbine generator system of claim 4, further comprising a brake block, said brake block being connected to said sliding sleeve and in frictional contact with said transition flange; or the brake block is connected with the transition flange and is in frictional contact with the sliding sleeve.

6. The twin-head wind turbine generator system according to claim 5, wherein the top of the sliding sleeve has a radially extending upper flange, the top of the transition flange has a radially extending upper end flange, the brake block is connected to the sliding sleeve, and the brake block and the upper flange are respectively clamped on the upper and lower sides of the upper end flange.

7. The twin-head wind turbine generator set of claim 6, wherein said brake block is attached to a lower surface of said upper flange, and said brake block is in frictional contact with a lower surface of said upper end flange.

8. The twin-head wind turbine generator system according to claim 6, wherein the brake blocks have an L-shaped cross section, and are in frictional contact with the lower surface and the side surface of the upper end rim, respectively; or the brake blocks are respectively in friction contact with the upper surface and the side surface of the upper end edge.

9. The double-head wind turbine generator system according to claim 4, wherein a lower flange is provided at the bottom of the sliding sleeve, and the lower flange is connected to the support beam through a plurality of support rods.

10. The twin-head wind turbine generator system of claim 4, wherein the bottom of said sliding sleeve is provided with a lower flange, the bottom of said transition flange is provided with a lower end edge, said lower end edge is connected with the upper surface of said tower, and said lower flange rests on said lower end edge.

11. A method of operating a twin-head wind turbine generator system, implemented using a twin-head wind turbine generator system according to any of claims 1 to 10.

12. The method of operating a twin-head wind turbine generator set according to claim 11, wherein the rotational speed of the impellers is controlled so that the rotational speeds of the impellers are different, thereby controlling the rotation of the support beam relative to the shaft of the tower.

Technical Field

The invention relates to a double-head wind turbine generator set and an operation method thereof.

Background

The single machine large-capacity machine type is the main trend of the development of the wind power technology, the large-capacity machine set can reduce the number of equipment and machine sites, reduce the occupied area and reduce the land acquisition difficulty, and under limited space and resources, the large-capacity machine set can also reduce the investment proposal cost of equipment, transportation and construction, the development of the large-capacity machine set faces a lot of challenges, large parts matched with the large-capacity machine set are huge, the difficulty in land transportation and hoisting is high, the development design, manufacture, operation and maintenance of blades, engine rooms, hubs, bearings and the like are difficult, the length of the existing trial-manufactured blades reaches 107 meters, the diameter of an impeller reaches 220 meters, and land transportation is almost impossible. Firstly, the diameter of a blade is large, the aerodynamic force difference of the blade tips at the upper position and the lower position is also large, and the imbalance of the blade is serious; secondly, the thickness and weight of the large blade are increased, so that the pneumatic efficiency is reduced, and the power generation efficiency is influenced; thirdly, the requirements on the bearing capacity and the bearing capacity of the large-capacity unit are higher and higher, the cost is increased rapidly, the unit monomer capacity is larger, the workpiece size is larger, and the size of the fasteners such as bolts and nuts is correspondingly increased, so that the traditional assembly process is challenged, and the operation and maintenance difficulty and the labor intensity are increased.

Disclosure of Invention

The invention aims to overcome the defect of poor support of a double-head wind turbine generator set in the prior art, and provides a double-head wind turbine generator set and an operation method thereof.

The invention solves the technical problems through the following technical scheme: the utility model provides a duplex locomotive wind-powered electricity generation unit, its includes unit and pylon, the quantity of unit is two, install on the pylon and support a supporting beam of unit, the unit is installed respectively the both ends of a supporting beam, two stagger each other between the blade of unit, two the center distance of unit is greater than the impeller radius of unit just is less than the impeller diameter of unit.

In this scheme, through setting up the position of unit on a supporting beam and being closer to the tie point of a supporting beam and pylon, make the blade of unit sweep the wind area and have the partial overlap region in space to reduce the moment that the unit produced on a supporting beam, improve a supporting beam's supporting effect, simultaneously, the duplex head can share some equipment, reduces the quantity of equipment and machine position, practices thrift the cost.

Preferably, the blades of the two sets are respectively distributed on the front side and the rear side of the supporting beam.

In this scheme, set up two unit blades one in a supporting beam front side, another sets up in a supporting beam's rear side, and the blade of being convenient for is swept wind, avoids the blade collision between two units, because the blade between two units has certain distance, can improve wind energy utilization.

Preferably, the tower further comprises a control system for controlling the rotational speed of the impeller, and the support beam is rotatable about the axis of the tower.

The power equipment of general driftage sets up in the center department, because truss girder length is big, central moment of torsion is great during the driftage, and the power requirement to the driftage is higher, in this scheme, makes the impeller rotational speed of two units different through control system, because the rotational speed is poor, makes the moment of unit on a supporting beam inequality, and then a supporting beam can rotate around the axle of pylon, and the driftage motion need not set up special power equipment moreover, practices thrift the cost.

Preferably, a transition flange is connected to the tower, a sliding sleeve nested with the transition flange is connected to the supporting beam, the sliding sleeve and the transition flange are of a circular shaft sleeve structure, and the sliding sleeve can rotate relative to the transition flange.

In the scheme, the transition flange is fixed on the tower frame, the sliding sleeve and the connected supporting beam rotate relative to the transition flange, the circular shaft sleeve is simple in structure and convenient to process, and the precision is easy to guarantee after installation.

Preferably, the double-head wind turbine generator set further comprises a brake block, and the brake block is connected with the sliding sleeve and in friction contact with the transition flange; or the brake block is connected with the transition flange and is in frictional contact with the sliding sleeve.

In this scheme, under the condition that does not have the brake block, the degree of freedom between sliding sleeve and the transition flange is too high, can rotate at will between sliding sleeve and the transition flange, is unfavorable for the rigidity of unit and the degree of accuracy of driftage to the wind, sets up the brake block after, rotation between them has certain frictional force, limits its pivoted degree of freedom, when needs yaw in addition, also easily controls the position of rotating back supporting beam.

Preferably, the top of sliding sleeve has the upper flange that radially stretches out, the top of transition flange has the upper end reason that radially stretches out, the brake block is connected on the sliding sleeve, just the brake block with the upper flange presss from both sides respectively and locates the upper and lower both sides of upper end reason.

In this scheme, transition flange's upper end edge clamp is established between the last flange of brake block and sliding sleeve, along axial emergence displacement between restriction transition flange and the sliding sleeve, can guarantee the friction effect when both rotate simultaneously, simple structure moreover, simple to operate.

Preferably, the brake block is attached to the lower surface of the upper flange and is in frictional contact with the lower surface of the upper end rim.

In this scheme, the brake block is connected at the lower surface of upper flange, and make full use of space is convenient for to the brake block installation.

Preferably, the cross section of the brake block is in an L shape, and the brake block is in friction contact with the lower surface and the side surface of the upper end edge respectively; or the brake blocks are respectively in friction contact with the upper surface and the side surface of the upper end edge.

In this scheme, through setting up two faces of brake block L shape respectively with the side of top end edge and upper surface or the side and the lower surface friction contact of top end edge, increased the friction contact area, improve the life of brake block.

Preferably, the bottom of the sliding sleeve is provided with a lower flange, and the lower flange is connected with the supporting beam through a plurality of supporting rods.

In this scheme, at the unit operation in-process, the sliding sleeve can receive great radial power, sets up a plurality of bracing pieces and a supporting beam connection on the lower flange through the sliding sleeve bottom, improves the stability of sliding sleeve.

Preferably, the bottom of the sliding sleeve is provided with a lower flange, the bottom of the transition flange is provided with a lower end edge, the lower end edge is connected with the upper surface of the tower frame, and the lower flange is placed on the lower end edge.

In this scheme, the lower flange of sliding sleeve is shelved on transition flange's lower extreme edge, makes on the load of unit and a supporting beam transmits the pylon through lower flange and lower extreme edge structure, and the structure is compacter moreover, and stability is good.

The invention also discloses an operation method of the double-head wind turbine generator set, which is realized by using the double-head wind turbine generator set.

Preferably, the rotational speed of the impellers is controlled such that the rotational speed of the impellers differs, thereby controlling the rotation of the support beam relative to the axis of the tower.

In this scheme, through control impeller rotational speed, make to have the rotational speed difference between the impeller, and then make two units produce the moment of equidimension not on a supporting beam, a supporting beam rotates for the pylon to realize driftage, do not need special power equipment moreover, practice thrift the cost.

The positive progress effects of the invention are as follows: the position of the unit on the supporting beam is closer to the connecting point of the supporting beam and the tower, so that the blade wind sweeping area of the unit is partially overlapped in space, the moment generated by the unit on the supporting beam is reduced, the supporting effect of the supporting beam is improved, meanwhile, partial equipment can be shared by the double heads, the quantity of the equipment and the machine position points is reduced, and the cost is saved.

Drawings

Fig. 1 is a schematic structural diagram of a double-head wind turbine generator set according to a preferred embodiment of the present invention.

FIG. 2 is a schematic view of a support beam structure according to a preferred embodiment of the present invention.

Fig. 3 is a schematic diagram of an internal structure of a dual-head wind turbine generator set according to a preferred embodiment of the present invention.

Fig. 4 is a partial structural diagram of a portion a in fig. 3 according to a preferred embodiment of the present invention.

FIG. 5 is a schematic view of the location of the assembly and impeller in accordance with a preferred embodiment of the present invention.

FIG. 6 is a partial schematic structural view of the brake block, the upper flange and the upper rim according to the preferred embodiment of the present invention.

FIG. 7 is a partial view of the lower flange and lower rim of the preferred embodiment of the present invention.

Description of reference numerals:

unit 1

Blade 11

Tower 2

Transition flange 21

Upper end edge 210

Lower edge 211

Foundation 22

Supporting beam 3

Sliding sleeve 31

Upper flange 310

Lower flange 311

Fixing ring 32

Reinforcing plate 33

Cover plate 34

Support bar 35

Main stress steel pipe 36

Steel strand 360

Prestressing system 37

Brake block 4

Anchor 5

Prestressing cable 6

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.

In this embodiment, as shown in fig. 1 to 5, a double-head wind turbine generator set 1 includes two sets 1 and two towers 2, the towers 2 are provided with support beams 3 for supporting the sets 1, the sets 1 are respectively installed at two ends of the support beams 3, blades 11 of the two sets 1 are staggered with each other, and a center distance between the two sets 1 is greater than an impeller radius of the sets 1 and smaller than an impeller diameter of the sets 1. The position of the unit 1 on the supporting beam 3 is closer to the connecting point of the supporting beam 3 and the tower 2, so that the wind sweeping area of the blades 11 of the unit 1 is partially overlapped in space, the moment generated by the unit 1 on the supporting beam 3 is reduced, the supporting effect of the supporting beam 3 is improved, meanwhile, partial equipment can be shared by the double heads, the quantity of the equipment and the machine position points is reduced, and the cost is saved.

The existing mature machine type can be used in the embodiment, the unit 1 with the capacity of one machine site on land being more than 8-10MW or more than 15-20MW on the sea can be rapidly realized, two impellers in the embodiment are double blades 11, the unit 1 with the double blades 11 is adopted, the rotating speed is high, the wind energy conversion rate is high, and the wind sweeping area of each blade 11 is 0.32D²—0.39D²While the wind sweeping area of the common 3-blade 11 fan is 0.26D²Compared with the common large-blade 11 unit 1, the tip speed of the unit 1 is very high, the rotating speed is low, the wind energy conversion rate in a very large area near the blade root is very low, the truss girder structure and the strength design are mainly considered by adopting partial overlapping of 2 x 2 blades 11, the overall cost efficiency of the unit 1 is optimal, wherein two fixing rings 32 are welded on a supporting beam 3, the two units 1 are respectively connected with the fixing rings 32 through bolts, no relative movement exists between the unit 1 and the supporting beam 3, the installation position of the unit 1 is shown in fig. 5, and the central distance L of the unit 1 is smaller than the diameter D of an impeller and larger than the radius D/2 of the impeller.

As shown in fig. 1, in this embodiment, the blades 11 of the two units 1 are respectively distributed on the front and rear sides of the supporting beam 3, one of the blades 11 of the two units 1 is arranged on the front side of the supporting beam 3, and the other is arranged on the rear side of the supporting beam 3, so that the blades 11 can sweep wind conveniently, and the collision of the blades 11 between the two units 1 is avoided, and the wind energy utilization rate can be improved because the blades 11 between the two units 1 have a certain distance. In other embodiments, it is also possible to arrange the two units 1 on the same side of the support beam 3, with the blades 11 of the two units 1 being offset with respect to each other.

In this embodiment, the yaw system further includes a control system (not shown in the figure) for controlling the rotation speed of the impeller, the support beam 3 can rotate around the shaft of the tower 2, the power equipment for yaw is generally arranged at the center, because the length of the truss beam is large, the torque at the center is large during yaw, and the requirement on the power for yaw is high, in this scheme, the rotation speeds of the impellers of the two sets 1 are different through the control system, because of the difference in rotation speed, the moments of the sets 1 on the support beam 3 are different, and further, the support beam 3 can rotate around the shaft of the tower 2, and the yaw movement does not need to be provided with special power equipment, such as a yaw motor, a yaw gear and other parts, so that the cost is saved. In other embodiments, the yaw may be realized by adjusting the position of the unit 1 by providing that the unit 1 is rotatable around the support beam 3 without providing a control system for controlling the rotation speed of the impeller.

As shown in fig. 4, in the present embodiment, a transition flange 21 is connected to the tower 2, a sliding sleeve 31 nested with the transition flange 21 is connected to the support beam 3, the sliding sleeve 31 and the transition flange 21 are circular sleeve structures, the sliding sleeve 31 can rotate relative to the transition flange 21, the transition flange 21 is fixed on the tower 2, the sliding sleeve 31 and the connected support beam 3 rotate relative to the transition flange 21, the circular sleeve structure is simple and convenient to process, and the accuracy is easy to ensure after installation, wherein the sliding sleeve 31 connected to the support beam 3 is equivalent to an outer sleeve of a large sliding bearing, the steel structure transition flange 21 installed on the upper portion of the tower 2 is equivalent to an inner shaft of the large sliding bearing, details of yaw grease and friction plates are omitted, in other embodiments, the sliding sleeve 31 and the transition flange 21 are not provided, and yaw is realized by using other structures which are convenient to rotate in the prior art.

The double-head wind turbine generator set 1 further comprises a brake block 4, and the brake block 4 is connected with the sliding sleeve 31 and is in friction contact with the transition flange 21; or the brake block 4 is connected with the transition flange 21 and is in friction contact with the sliding sleeve 31. In the absence of the brake blocks 4, the degree of freedom between the sliding sleeve 31 and the transition flange 21 is too high, the sliding sleeve 31 and the transition flange 21 can rotate freely, which is not beneficial to the position fixing of the unit 1 and the accuracy of yaw against wind, after the brake blocks 4 are arranged, the rotation between the sliding sleeve 31 and the transition flange 21 has certain friction force to limit the degree of freedom of rotation, and when yaw is needed, the position of the support beam 3 after rotation is easy to control, as shown in fig. 4 and 6, the brake blocks 4 in the embodiment are arranged on the sliding sleeve 31 and in frictional contact with the transition flange 21, in other embodiments, the brake blocks 4 can be arranged on the transition flange 21 and in frictional contact with the sliding sleeve 31, in the embodiment, a plurality of brake blocks 4 are arranged, and in common frictional contact with the plurality of brake blocks 4, the friction force of a single brake block 4 can be reduced, the service life of the brake block 4 can be prolonged, in other embodiments, a single friction block may also be provided as desired.

As shown in fig. 4 and 6, in this embodiment, the top of the sliding sleeve 31 has an upper flange 310 extending radially, the top of the transition flange 21 has an upper end edge 210 extending radially, the brake block 4 is connected to the sliding sleeve 31, and the brake block 4 and the upper flange 310 are respectively clamped on the upper and lower sides of the upper end edge 210, the upper end edge 210 of the transition flange 21 is clamped between the brake block 4 and the upper flange 310 of the sliding sleeve 31, so as to limit the axial displacement between the transition flange 21 and the sliding sleeve 31, and simultaneously, the friction effect when the transition flange 21 and the sliding sleeve 31 rotate can be ensured.

As shown in fig. 4 and 6, in the present embodiment, the brake pads 4 are attached to the lower surface of the upper flange 310, and the brake pads 4 are in frictional contact with the lower surface of the upper flange 210, and the brake pads 4 are attached to the lower surface of the upper flange 310, thereby making full use of space and facilitating installation of the brake pads 4.

The section of the brake block 4 is in an L shape, and the brake block 4 is in friction contact with the lower surface and the side surface of the upper end edge 210 respectively; or the brake pads 4 are in frictional contact with the upper surface and the side surfaces of the upper end rim 210, respectively. As shown in fig. 4, in this embodiment, the transition flange 21 is nested in the sliding sleeve 31, and the brake pads 4 are in frictional contact with the lower surface and the side surface of the upper end edge 210, respectively, in other embodiments, the sliding sleeve 31 may be nested in the transition flange 21, and the brake pads 4 are in frictional contact with the upper surface and the side surface of the upper end edge 210, respectively, and by disposing two L-shaped surfaces of the brake pads 4 in frictional contact with the side surface and the upper surface of the upper end edge 210 or the side surface and the lower surface of the upper end edge 210, the frictional contact area is increased, and the service life of the brake pads 4 is prolonged.

In this embodiment, as shown in fig. 4 and 7, the bottom of the sliding sleeve 31 is provided with a lower flange 311, the lower flange 311 is connected to the supporting beam 3 through a plurality of supporting rods 35, during the operation of the unit 1, the sliding sleeve 31 is subjected to a large radial force, and the plurality of supporting rods 35 are arranged on the lower flange 311 at the bottom of the sliding sleeve 31 and connected to the supporting beam 3, so as to improve the stability of the sliding sleeve 31.

In this embodiment, as shown in fig. 4 and 7, the bottom of the sliding sleeve 31 is provided with a lower flange 311, the bottom of the transition flange 21 is provided with a lower end edge 211, the lower end edge 211 is connected with the upper surface of the tower 2, the lower flange 311 rests on the lower end edge 211, and the lower flange 311 of the sliding sleeve 31 rests on the lower end edge 211 of the transition flange 21, so that the load of the unit 1 and the support beam 3 is transmitted to the tower 2 through the structure of the lower flange 311 and the lower end edge 211, and the structure is more compact and has good stability.

Specifically, in this embodiment, the supporting beam 3 is a prestressed truss beam, the steel material for the structure is considered to be the minimum, the prestressed steel pipe has high fatigue resistance and high bearing capacity, the truss beam is formed by welding steel pipes with different specifications, two fixing rings 32 are welded on the truss beam and used for the bolt connection unit 1, the sliding sleeve 31 is welded on the truss beam through a reinforcing plate 33 and a supporting rod 35, the prestressed system 37 is applied in the middle of a main stressed steel pipe 36, the detailed structure mainly comprises a steel strand 360, an anchorage device 5 and an end plate, the sliding sleeve 31 is installed on the transition flange 21 and can slide relatively, the brake block 4 can increase the relative sliding resistance, and the cover plate 34 is installed on the reinforcing plate 33. The tower frame 2 is formed by pouring concrete, the lower part of the concrete is a foundation 22, the concrete tower frame 2 is an external prestressed structure in the embodiment, and as shown in fig. 1, 3 and 4, an upper transition flange 21 is connected with a prestressed cable 6 and the concrete tower frame 2 into a whole through an anchorage device 5.

The concrete tower 2 is mainly used for solving the huge bearing capacity of the double-head fan, the concrete tower 2 can meet the frequency requirement of the double-head fan, the 8-10MW double-head fan does not need a very high tower 2 in a wind resource excellent area, the conventional length is 80-90 meters, if a common 8-10MW high-power unit 1 is installed, the blade 11 is very long, and the tower 2 needs to be heightened to be more than 120 meters, so that the problems of transportation and hoisting are brought, the blade 11 and the structural form of the unit 1 are optimized in the embodiment, and the truss girder is combined with the concrete tower 2, so that the lowest cost of high power is realized.

The embodiment also discloses an operation method of the double-head wind turbine generator set 1, which is realized by using the double-head wind turbine generator set 1.

In this embodiment, the rotation speed of the impeller is controlled to make the rotation speeds of the impeller different, so as to control the rotation of the support beam 3 relative to the shaft of the tower 2, and through controlling the rotation speed of the impeller, the rotation speed difference between the impellers is made, so as to make the two units 1 generate moments of different sizes on the support beam 3, and the support beam 3 rotates relative to the tower 2, thereby realizing yawing without special power equipment and saving cost. In other embodiments, the yaw may be achieved by manually driving the support beam 3 to rotate without controlling the rotation speed of the impeller, or by providing a yaw motor capable of driving the support beam 3 to rotate.

The running state of the double-head wind turbine generator set of the embodiment is as follows:

the normal operation state of the unit 1 is as follows: the rotating speeds of the impellers of the two units 1 are the same, one rotates anticlockwise, the other rotates clockwise, the moments generated by the impellers of the two units 1 are offset in the center of the supporting beam 3, and at the moment, the truss beam is fixed and does not have a yawing state.

Yaw state of the unit 1: when the wind direction changes and needs to yaw, the control system is used for controlling the rotating speeds of the double impellers, the impellers generate a rotating speed difference, the moment cannot be completely offset, the truss girder can be rotated by an angle through the moment, after the wind is in place, the impellers are controlled to recover the same rotating speed, the moment is offset, and the yaw stops under the friction of the brake block 4.

The shutdown state of the unit 1 is as follows: when no wind exists, the unit 1 is not controlled, and the impeller is in a free state; when wind exists, the yaw can also freely drift, namely passively face the wind, and the wind blows the minimum stressed position; the rotation speed can be actively controlled when wind exists, so that the support beam 3 rotates to face the wind.

The installation process of the double-head wind turbine generator set 1 in the embodiment is as follows: firstly, completing the pouring of a pre-support unit of a concrete tower 2 and the processing and manufacturing of a transition flange 21, installing the pre-support unit of the concrete tower 2, finally installing the transition flange 21, and installing an upper anchorage device 5 and a lower anchorage device 5 of a prestress system 37 and a tensioning prestress cable; secondly, welding the truss girder, preparing steel pipes with various specifications, a sliding sleeve 31 and a fixing ring 32, performing factory welding and surface corrosion prevention treatment, tensioning a main steel pipe prestress system 37, transporting to the site, hoisting to the top of the tower frame 2, installing a brake block 4, transporting the truss girder integrally, splitting into a plurality of blocks, and welding on the site; finally, the unit 1 and the impeller are installed.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.