Windproof wind-shield wall suitable for tower type photo-thermal power station heliostat

Abstract

The utility model relates to the technical field of wind resistance of heliostats, in particular to a wind-proof wind-shield wall suitable for a tower type photo-thermal power station heliostat. The windproof wind-shield wall comprises a plurality of blade-free wind driven generators. A plurality of blade-free wind driven generators are uniformly arranged between the edge of the heliostat field and the adjacent heliostats; the bladeless wind driven generator is composed of a generator, a vibration shell, a center rod and a tuning system. A stator of the generator is installed on the center rod, and a rotor of the generator is fixed to the inner wall of the vibration shell. The tuning system is used for dynamically adjusting the natural vibration frequency of the bladeless wind driven generator. Compared with a traditional heliostat wind-shield wall, the wind-shield wall forms a wind-light cooperative power generation system, and the overall energy output of a heliostat field is improved; and the advantages that the occupied area is small, and the blade-free fan can be assembled in a modularized mode are achieved.

Description

Technical Field

[0001] This utility model relates to the field of heliostat wind resistance technology, and specifically to a windproof wall suitable for heliostats in tower-type solar thermal power plants. Background Technology

[0002] Heliostats, as the basic optical unit of tower solar thermal power plants, account for approximately 40% to 50% of the total cost of the plant. Essentially, they are focusing mirrors installed on the supporting structure, primarily using mechanical drive to collect and reflect solar energy into the receiver. Heliostats are wind-sensitive structures; when exposed to high wind speeds, a high-pressure region caused by the rupture of a large vortex appears at the leading edge of the mirror, inducing peak hinge moments and resonance, ultimately leading to structural failure.

[0003] Heliostats are numerous, lightweight, and highly flexible. To ensure light-tracking performance, energy efficiency, and economy, their structural design limits their wind resistance. Excessive wind resistance design would also significantly increase the total cost of a heliostat field. Currently, the more economical approach is to use physical isolation methods for wind resistance.

[0004] Existing physical isolation methods mainly involve constructing windbreaks at the outer edge of the heliostat field to control wind conditions. These windbreaks are effective at reducing wind load on the edge areas of the heliostat field, but have little effect on the heliostats in the inner areas, which constitute the majority of the field. Furthermore, current windbreaks are functionally limited, only absorbing wind energy and failing to utilize or convert it. Utility Model Content

[0005] The purpose of this invention is to solve the problems existing in the prior art and provide a windbreak wall suitable for heliostats in tower-type solar thermal power plants. This invention uses a bladeless wind turbine placed within the heliostat field to absorb wind energy for power generation, thereby reducing the overall wind energy and the incoming wind speed, thus decreasing the wind load on the heliostat.

[0006] The technical solution provided by this utility model is a windbreak wall suitable for heliostats in tower-type solar thermal power plants, comprising several bladeless wind turbines; the bladeless wind turbines are evenly arranged at the edge of the heliostat field and between adjacent heliostats; each bladeless wind turbine consists of a generator, a vibrating shell, a central rod, and a tuning system; the stator of the generator is mounted on the central rod, and the rotor of the generator is fixed to the inner wall of the vibrating shell; the tuning system is used to dynamically adjust the natural frequency of the bladeless wind turbine.

[0007] Preferably, the height of the bladeless wind turbine arranged at the edge of the heliostat field is more than twice the height of the heliostat support.

[0008] Preferably, the bladeless wind turbines arranged at the edge of the heliostat field are arranged at equal intervals, and the interval D satisfies the following relationship: 2d < D < a, where d is the diameter of the bladeless wind turbine and a is the distance between adjacent heliostats.

[0009] Preferably, the distance L between the bladeless wind turbine arranged at the edge of the heliostat field and the heliostat at the edge of the heliostat field satisfies the relational expression: 2h < L < 5h; h is the height of the heliostat support column.

[0010] Preferably, the height of the bladeless wind turbine arranged inside the heliostat field is less than the height of the heliostat support column.

[0011] Preferably, the distance s between the bladeless wind turbine arranged inside the heliostat field and the heliostat satisfies the relational expression: s = ( / 3) a, where a is the distance between adjacent heliostats.

[0012] Preferably, the shape of the vibrating housing is a circular or quasi-circular blunt body.

[0013] The windproof and wind-blocking wall provided by the present utility model is mainly composed of bladeless wind turbines. The bladeless wind turbines work based on the principle of vortex-induced resonance. The vibration amplitude is non-linearly related to the oncoming wind speed. Resonance occurs and power is generated within the preset working wind speed range, and vibration is automatically suppressed when exceeding this range. This windproof and wind-blocking wall can not only absorb the wind energy of the heliostat field, reduce the wind pressure load on the surface of the heliostat, but also make full use of the absorbed wind energy and convert it into electric energy, having good economic benefits. Compared with the traditional heliostat wind-blocking wall, this wind-blocking wall forms a wind-solar collaborative power generation system, improving the overall energy output of the heliostat field; it also has the advantages of small floor area and modular assembly of the bladeless wind turbines. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall structural layout of the windproof and wind-blocking wall applicable to the heliostat of the tower-type solar thermal power station in the embodiment of the present utility model;

[0015] Figure 2 It is a schematic diagram of the structure of the bladeless wind turbine;

[0016] Figure 3 It is a schematic diagram of the structure of the heliostat;

[0017] Figure 4 It is a layout diagram of the bladeless wind turbines in the edge area of the heliostat field;

[0018] Figure 5 It is a layout diagram of the bladeless wind turbines in the internal area of the heliostat field;

[0019] In the figure, 1. bladeless wind turbine; 11. the first bladeless wind turbine; 12. the second bladeless wind turbine; 1001; vibration housing 1002; central rod 1003; tuning system 1004; 2. solar field mirror; 2001. mirror; 2002. column. Specific embodiments

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clear, the following further details this application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0021] Embodiment 1 This embodiment provides a windproof and wind-breaking wall for the solar field mirror of a tower-type solar thermal power station. As Figure 1 shown, this windproof and wind-breaking wall is composed of several bladeless wind turbines 1, and these bladeless wind turbines 1 are arranged in a uniformly arranged manner around the solar field mirror 2 and between each solar field mirror 2.

[0022] As Figure 2 shown, the main structure of the bladeless wind turbine 1 includes 4 key structural components: generator 1001, vibration housing 1002, central rod 1003, and tuning system 1004. The shape of the vibration housing is a circular or quasi-circular blunt body.

[0023] As Figure 3 shown, the main structure of the solar field mirror 2 is composed of a mirror 2001 and a column 2002.

[0024] As Figure 4 shown, the height H1 of the first bladeless wind turbine 11 arranged at the edge of the solar field mirror field should be greater than twice the height h of the solar field mirror support column, that is, H1 > 2h, so as to achieve a better effect of reducing the wind load on the surface of the solar field mirror in the mirror field.

[0025] The first bladeless wind turbines 11 arranged at the edge of the solar field mirror field are arranged at equal intervals, and the interval D satisfies the following relationship: 2d < D < a, where d is the diameter of the bladeless wind turbine and a is the distance between adjacent solar field mirrors. When the interval D is too small, the bladeless wind turbines are prone to collision during operation, resulting in damage and affecting efficiency; when the interval D is too large, the effect of the bladeless wind turbines absorbing wind energy is not good.

[0026] The distance L between the first bladeless wind turbine 11 arranged at the edge of the solar field mirror field and the solar field mirror 2 at the edge of the solar field mirror field satisfies the relationship: 2h < L < 5h. If the distance L is too large, it will lead to a reduction in the wind-blocking ability of the bladeless wind turbine for the solar field mirror field. If the distance L is too small, it will lead to the bladeless wind turbine blocking the solar field mirror, thereby reducing the working efficiency of the solar field mirror.

[0027] As Figure 5 As shown, the height H2 of the second bladeless wind turbine 12 arranged inside the heliostat field should be less than the height h of the heliostat support, i.e., H2 < h. If the height of the internal bladeless wind turbine is too high, it will block the heliostat, thereby reducing the efficiency of the heliostat in absorbing light energy.

[0028] The distance s between the second bladeless wind turbine 12, located inside the heliostat field, and the heliostat 2 satisfies the following relationship: s = ( / 3) a. While avoiding collisions between bladeless wind turbines and nearby heliostats, effectively absorb and reduce wind energy within the heliostat field.

[0029] The bladeless wind turbine 1 generates wind power based on the fundamental aerodynamic principle of vortex-induced resonance galloping. Specifically, when the incoming wind acts on the vibrating outer shell 1002 with a circular blunt surface, the vibrating outer shell 1002 will be subjected to a periodic vortex-induced force generated by the incoming wind. The vibrating outer shell 1002 then transmits this force to the central rod 1003 fixed to it, causing the central rod 1003 to deform. The central rod 1003 thus drives the vibrating outer shell to begin vortex-induced vibration, which in turn drives the rotor on the vibrating outer shell 1002 to move, while the internal stator remains stationary. A relative displacement is generated between the rotor and the stator, and the generator 1001 starts working, and the wind turbine begins to generate electricity. The tuning system 1004 consists of two annular magnets with opposite magnetic poles: one is located on the central rod of the generator; the other is fixed to the vibrating outer shell of the bladeless wind turbine. When the wind speed increases, the amplitude of the bladeless wind turbine increases, and the magnetic force between the two magnets increases. When two magnets approach each other, the repulsive force between them increases in a superlinear fashion. At this point, the resonator system of the bladeless wind turbine effectively gains a stiffness that increases with the amplitude. Therefore, as the amplitude increases, the frequency of the bladeless wind turbine increases, thereby expanding the "lock-in range" of the bladeless wind turbine's vortex-induced vibration.

[0030] Based on the basic operating characteristics of the bladeless wind turbine 1, it is placed in a heliostat field to absorb wind energy, thereby reducing the wind speed in the field and generating electricity.

[0031] Due to the influence of the bladeless wind turbines located at the edge of the heliostat field, after the incoming wind interacts with the bladeless wind turbines, some of the wind energy near the ground is absorbed by the turbines. The attenuated corrected wind speed has a much smaller impact on the heliostat compared to the near-ground incoming wind that does not pass through the bladeless wind turbines.

[0032] Due to the effect of the bladeless wind turbines arranged on the periphery of the heliostat field and the heliostats at the edge of the field, the incoming wind in the central field itself becomes smaller. At this time, arranging bladeless wind turbines inside the heliostat field can further reduce the wake effect between the heliostats and the wind magnitude in the central part of the field.

[0033] This embodiment provides a layout scheme for the windbreak and windshield walls of a heliostat field in a tower-type solar thermal power station. Taking a heliostat with a mirror panel area of 36 m 2 developed by a certain domestic company as an example, the height h of the support column of this heliostat is 4.1 m, the distance a between the heliostats in the field is 9 m, and the bladeless wind turbines are arranged in a zoned manner, specifically divided into an edge protection area and an internal wind energy absorption area.

[0034] Layout in the edge area: The height H1 of the bladeless wind turbine is 9 m (satisfying H1 > 2h), and the diameter d1 of the fan is 0.732 m. The spacing D of the bladeless wind turbines is taken as 4 m, satisfying the relationship: 1.464 m < D < 9 m. The distance L between the bladeless wind turbines at the edge and the heliostats at the edge of the heliostat field satisfies: 8.2 m < L < 20.5 m (i.e., 2h < L < 5h). In this embodiment, L = 10 m is selected, which can not only avoid blocking the heliostats but also effectively reduce the wind load.

[0035] Layout in the internal area: The height H2 of the bladeless wind turbine is 3 m (satisfying H2 < h), and the diameter of the fan is 0.244 m to avoid blocking the light energy absorption of the heliostats. The distance s between the bladeless wind turbine and the heliostat is calculated according to the formula s = ( / 3) a, and s is taken as 5.2 m for layout to ensure that there is no collision between the fan and the heliostat and effectively absorb the wind energy in the field.

[0036] The 9-m-high bladeless wind turbines in the edge area can significantly attenuate the incoming wind speed and reduce the wind load at the edge of the field.

[0037] The 3-m-high bladeless wind turbines in the internal area further absorb the wind energy inside the field and reduce the wake effect.

[0038] The electric energy generated by all bladeless wind turbines can be incorporated into the power grid of the solar thermal power station to form a wind-solar complementary power generation system.

[0039] Through the above layout, the wind load of the heliostat field is significantly reduced, and at the same time, the effective utilization of wind energy is achieved, taking into account both economy and protection effect.

[0040] The above description is only one embodiment of the present utility model and is not intended to limit the patent scope of the present utility model. It should be noted that the above embodiments are for illustrative purposes only and not for limiting the present utility model. Furthermore, those skilled in the art can design alternative embodiments or apply them directly or indirectly to other related technical fields without departing from the scope of the appended claims, and all of these are similarly included within the patent protection scope of the present utility model.

Claims

1. A windbreak wall suitable for heliostats in tower-type solar thermal power plants, characterized in that: It includes a number of bladeless wind turbines; the number of bladeless wind turbines are evenly arranged at the edge of the heliostat field and between adjacent heliostats; the bladeless wind turbine consists of a generator, a vibrating housing, a central rod, and a tuning system; the stator of the generator is installed on the central rod, and the rotor of the generator is fixed to the inner wall of the vibrating housing; the tuning system is used to dynamically adjust the natural vibration frequency of the bladeless wind turbine.

2. The windbreak wall suitable for use in a heliostat of a tower type solar thermal power plant according to claim 1, characterized in that: The height of the bladeless wind turbine arranged at the edge of the heliostat field is not less than twice the height of the heliostat support.

3. The windbreak wall suitable for use in a heliostat of a tower type solar thermal power plant according to claim 1, characterized in that: The bladeless wind turbines arranged at the edge of the heliostat field are arranged at equal intervals, and the interval D satisfies the following relationship: 2d < D < a, where d is the diameter of the bladeless wind turbine and a is the distance between adjacent heliostats.

4. The windbreak wall suitable for use in a heliostat of a tower type solar thermal power plant according to claim 1, characterized in that: The distance L between the bladeless wind turbine arranged at the edge of the heliostat field and the heliostat at the edge of the heliostat field satisfies the relational expression: 2h < L < 5h; h is the height of the heliostat support.

5. The windbreak wall suitable for use in a heliostat of a tower type solar thermal power plant according to claim 1, characterized in that: The height of the bladeless wind turbine arranged inside the heliostat field is less than the height of the heliostat support.

6. The windbreak wall suitable for use in a heliostat of a tower type solar thermal power plant according to claim 1, characterized in that: The distance s between the bladeless wind turbine arranged inside the heliostat field and the heliostat satisfies the following relationship: s = ( / 3) a, where a is the distance between adjacent heliostats.

7. The windbreak wall suitable for use in a heliostat of a tower type solar thermal power plant according to claim 1, characterized in that: The geometric shape of the vibrating housing is a circular or quasi-circular blunt body.

Images