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

Abstract

The invention relates to the technical field of wind resistance of heliostats, in particular to a wind-proof wind-shield wall and method 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] The present invention relates to the technical field of wind resistance of heliostats, and in particular to a windproof wall and method suitable for heliostats in tower-type solar thermal power stations. Background Art

[0002] Heliostats, the fundamental optical unit of a tower-type CSP plant, account for approximately 40% to 50% of the plant's total cost. They are essentially focusing mirrors mounted on a supporting structure, mechanically driven to concentrate solar energy and reflect it into a heat sink. Heliostats are wind-sensitive structures. When exposed to high wind speeds, high-pressure regions develop at the leading edge of the mirrors due to the breakdown of large vortices. This can induce peak hinge torques and resonance, leading to structural failure.

[0003] However, due to their large number, light weight, and high flexibility, heliostats are designed to withstand winds to ensure optimal tracking performance, energy efficiency, and cost-effectiveness. Excessive wind resistance can significantly increase the total cost of a heliostat field. Currently, a more economical solution is to use physical isolation to provide wind resistance.

[0004] Existing physical isolation measures primarily involve constructing windbreaks at the outer edges of the heliostat field to control the wind environment. These windbreaks are effective at reducing loads on the periphery of the heliostat field, but have little effect on the heliostats in the inner area, which makes up the majority of the field. Furthermore, current windbreaks are limited in their function, serving only to absorb wind energy but failing to utilize or convert it. Summary of the Invention

[0005] The present invention aims to address the problems existing in the prior art by providing a windbreak wall and method suitable for heliostats in tower-type solar thermal power plants. This invention incorporates bladeless wind turbines within a heliostat field to absorb wind energy from the field to generate electricity. This reduces overall wind energy and incoming wind speed, thereby reducing the wind load on the heliostats.

[0006] The technical solution provided by the present invention is a windbreak wall suitable for heliostats in a tower-type solar thermal power station, comprising a plurality of bladeless wind turbines; the plurality of bladeless wind turbines are evenly arranged at the edge of the heliostat field and between adjacent heliostats; the bladeless wind turbines are composed of a generator, a vibration housing, a center pole, and a tuning system; the stator of the generator is mounted on the center pole, and the rotor of the generator is fixed to the inner wall of the vibration housing; the tuning system is used to dynamically adjust the natural frequency of the bladeless wind turbines.

[0007] Preferably, the height of the bladeless wind turbines arranged at the edge of the heliostat field is greater than twice the height of the heliostat pillars.

[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 present invention also provides a wind prevention and wind shielding method applicable to the heliostats of a tower-type solar thermal power station. This method uses the wind prevention and wind shielding wall to absorb the wind energy around the heliostat field and reduce the wind pressure load on the surface of the heliostat; and based on the principle of vortex-induced resonance galloping, the absorbed wind energy is converted into electric energy.

[0014] The wind prevention and wind shielding wall provided by the present invention 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, and resonance occurs and power generation is carried out within a preset working wind speed range. When exceeding this range, the vibration is automatically suppressed. This wind prevention and wind shielding wall can not only absorb the wind energy of the heliostat field and 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 shielding wall, this wind shielding wall forms a wind-solar collaborative power generation system, improving the overall energy output of the heliostat field; and also has the advantages of small floor area and modular assembly of the bladeless wind turbines. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the overall structural layout of the wind prevention and wind shielding wall applicable to the heliostats of a tower-type solar thermal power station in an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the bladeless wind turbine; Figure 3 It is a schematic diagram of the structure of the heliostat; Figure 4 It is a layout diagram of the bladeless wind turbines in the edge area of the heliostat field; Figure 5 It is a layout diagram of the bladeless wind turbines in the internal area of the heliostat field; 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 heliostat; 2001. lens; 2002. column. Specific embodiments

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0017] Embodiment 1. This embodiment provides a windproof and wind-blocking wall for a solar heliostat in a tower-type solar thermal power station. As Figure 1 shown, the windproof and wind-blocking wall is composed of a number of bladeless wind turbines 1, and these bladeless wind turbines 1 are arranged in a uniformly arranged manner around the solar heliostat 2 and between each solar heliostat 2.

[0018] 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, tuning system 1004. The shape of the vibration housing is a circular or quasi-circular blunt body.

[0019] As Figure 3 shown, the main structure of the solar heliostat 2 is composed of a lens 2001 and a column 2002.

[0020] As Figure 4 shown, the height H1 of the first bladeless wind turbine 11 arranged at the edge of the solar heliostat field should be greater than twice the height h of the solar heliostat support column, that is, H1 > 2h, so as to achieve a better effect of reducing the wind load on the surface of the solar heliostat in the heliostat field.

[0021] The first bladeless wind turbines 11 arranged at the edge of the solar 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 solar heliostats. When the interval D is too small, the bladeless wind turbines are prone to collision during operation, causing damage and affecting efficiency; when the interval D is too large, the effect of the bladeless wind turbines absorbing wind energy is not good.

[0022] The distance L between the first bladeless wind turbine 11 arranged at the edge of the solar heliostat field and the solar heliostat 2 at the edge of the solar heliostat field satisfies the relational expression: 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 heliostat field. If the distance L is too small, the bladeless wind turbine will block the solar heliostat, thereby reducing the working efficiency of the solar heliostat.

[0023] like 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, that is, H2 < h. If the internal bladeless wind turbine is too high, it will block the heliostat, resulting in a decrease in the efficiency of the heliostat in absorbing light energy.

[0024] The distance s between the second bladeless wind turbine 12 and the heliostat 2 arranged inside the heliostat field satisfies the relationship: s=( / 3) a. While preventing bladeless wind turbines from colliding with nearby heliostats, it effectively absorbs and reduces wind energy within the heliostat field.

[0025] The bladeless wind turbine 1 generates wind power based on the fundamental aerodynamic principle of vortex-induced resonance (VIR) galloping. Specifically, when incoming wind strikes a circular, blunt-surfaced vibrating housing 1002, it is subjected to periodic vortex-induced forces. This force is then transmitted to a central rod 1003 to which it is affixed, causing the rod to deform. This in turn causes the vibrating housing to initiate VIR, driving the rotor within the housing 1002 in motion while the stator remains stationary. This creates a relative displacement between the rotor and stator, activating the generator 1001 and generating electricity. The tuning system 1004 consists of two annular magnets with opposing poles: one located on the generator's central rod and the other fixed to the vibrating housing. As wind speed increases, the vibration amplitude of the bladeless wind turbine increases, increasing the magnetic force between the two magnets. When two magnets approach, the repulsive force between them increases at a nonlinear rate. At this point, the bladeless wind turbine's resonant system effectively gains a stiffness that increases with the amplitude. Consequently, as the amplitude increases, the frequency of the bladeless wind turbine increases, thereby expanding the turbine's vortex vibration "locking range."

[0026] Based on the basic working characteristics of the bladeless wind turbine 1, it is placed in a heliostat field to absorb wind energy, reduce the wind speed in the field and generate electricity at the same time.

[0027] Due to the influence of the bladeless wind turbines arranged 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 wind turbines. The impact of the attenuated corrected wind speed on the heliostats is much smaller than that of the near-ground incoming wind that does not pass through the bladeless wind turbines.

[0028] 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 oncoming 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 speed in the central part of the field.

[0029] This embodiment provides an arrangement scheme for the windbreak and windshield walls of the heliostat field of a tower-type solar thermal power station. Taking a heliostat with a mirror panel area of 36 m 2 developed by a 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.

[0030] Arrangement 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 not only avoids blocking the heliostats but also effectively reduces the wind load.

[0031] Arrangement 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 arranged as 5.2 m to ensure that there is no collision between the fan and the heliostat and effectively absorb the wind energy in the field.

[0032] The 9-m-high bladeless wind turbines in the edge area can significantly attenuate the oncoming wind speed and reduce the wind load at the edge of the field.

[0033] The 3-m-high bladeless wind turbines in the internal area further absorb the wind energy inside the field and reduce the wake effect.

[0034] The electric energy generated by all the bladeless wind turbines can be incorporated into the power grid of the solar thermal power station to form a wind-solar hybrid power generation system.

[0035] Through the above arrangement, 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.

[0036] The above description is only one embodiment of the present invention and does not limit the patent scope of the present invention. It should be noted that the above embodiment illustrates the present invention rather than limits the invention, and those skilled in the art may design alternative embodiments without departing from the scope of the appended claims, or directly or indirectly apply them to other related technical fields, which are similarly included in the patent protection scope of the present invention.

Claims

1. A windbreak wall suitable for heliostats in tower-type solar thermal power stations, characterized by: It includes a number of bladeless wind turbines; the number of bladeless wind turbines are evenly arranged at the edge of the solar field and between adjacent solar mirrors; 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 for heliostats in a tower-type solar thermal power station according to claim 1, characterized in that: The height of the bladeless wind turbine arranged at the edge of the solar field is not less than twice the height of the solar mirror support column.

3. The windbreak wall suitable for heliostats in a tower-type solar thermal power station according to claim 1, characterized in that: The bladeless wind turbines arranged at the edge of the solar 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 mirrors.

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

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

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

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

8. A windproof method for heliostats in a tower-type solar thermal power station, characterized in that: This method uses the windbreak and wind shield wall described in any one of claims 1-7 to absorb the wind energy around the solar field and reduce the wind pressure load on the surface of the solar mirror; and based on the principle of vortex-induced resonance galloping, the absorbed wind energy is converted into electric energy.

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