Overhead photovoltaic and sand prevention system

Abstract

The invention discloses an elevated photovoltaic and sand prevention system, and the system comprises a photovoltaic unit which comprises a plurality of elevated sand burying prevention photovoltaic devices which are arranged in a photovoltaic field area in an array manner, each elevated sand burying prevention photovoltaic device comprises a photovoltaic panel and an elevated photovoltaic support, and the minimum distance between the photovoltaic panel and the ground surface is greater than a set value; the sand blocking and mist catching unit comprises an inclined sand blocking and mist catching barrier arranged in the upwind edge area of the photovoltaic field area, the inclined sand blocking and mist catching barrier comprises a plurality of sand blocking and mist catching plates, and mist catching mechanisms are arranged on the surfaces of the sand blocking and mist catching plates; the engineering sand stabilization unit comprises sand stabilization grids, and the sand stabilization grids are arranged at one or more positions in an inter-dune zone, a dune windward slope toe and a slope middle zone in the photovoltaic field; the sand stabilization and mist catching unit comprises a three-dimensional net; a biological sand fixation unit; therefore, the photovoltaic module is prevented from being damaged by sand storm such as burying by quicksand and undercutting, and is not influenced by topographic fluctuation.

Description

Technical Field

[0001] The invention relates to an elevated photovoltaic and sand prevention system, belonging to the technical field of ecological environment management. Background Art

[0002] Many large-scale photovoltaic bases in northwest my country are built in "sand and desert" areas, and most of them are suffering from serious wind and sand hazards. There are three main reasons for this. First, in desert areas, quicksand activities are frequent and the terrain is undulating. In Gobi desert areas, there are abundant sand sources, dry and windy, and quicksand has the characteristics of accumulation when encountering obstacles. Secondly, the photovoltaic array's own strong wind-blocking and sand-fixing effects will destroy the original balanced and stable wind and sand flow field, and then cause sand accumulation on the underlying surface and raise the sand surface elevation, which will directly cause the risk of sand burial for the photovoltaic array, or cause wind erosion of the foundation piles, or even collapse. Thirdly, northwest winds generally prevail in sand and desert areas, and under the premise that the photovoltaic panels are set facing south, the air supply channel formed by the panels and the ground will inevitably intensify the transmission process of wind and sand into the site.

[0003] There are no specific countermeasures for the sand burial and wind erosion hazards in the Shagohuang photovoltaic array area. When burial or erosion occurs, temporary treatment such as sand clearing or pile foundation reinforcement is often carried out by manual and mechanical methods. The photovoltaic array changes the flow field and topography, and the changes in topography and flow field aggravate the sand burial or erosion of photovoltaic facilities, forming a vicious circle. Existing technology cannot fundamentally solve the long-term damage caused by sand accumulation to photovoltaic arrays. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide an elevated photovoltaic and sand-proof system.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes:

[0006] An embodiment of the present invention provides an elevated photovoltaic and sand prevention system, comprising:

[0007] A photovoltaic unit, comprising a plurality of elevated anti-sand burial photovoltaic devices arrayed in a photovoltaic field area, wherein the elevated anti-sand burial photovoltaic devices comprise a photovoltaic panel and an elevated photovoltaic bracket, wherein the elevated photovoltaic bracket is at least used to support the photovoltaic panel, and the distance between the photovoltaic panel and the ground surface is adjustable, and the minimum distance between the photovoltaic panel and the ground surface is above a set value;

[0008] A sand-blocking and fog-catching unit comprises an inclined sand-blocking and fog-catching barrier arranged at the upwind edge area of ​​the photovoltaic field area, wherein the inclined sand-blocking and fog-catching barrier comprises a plurality of sand-blocking and fog-catching plates, wherein the plurality of sand-blocking and fog-catching plates are installed in parallel on a sand-blocking and fog-catching plate bracket and are distributed in a vertical direction to form a shutter structure, and a fog-catching mechanism is provided on the surface of the sand-blocking and fog-catching plates;

[0009] An engineering sand fixation unit, comprising sand fixation grids, which are arranged at one or more locations in the inter-dune zone, the foot of the windward slope of the sand dunes and the mid-slope area within the photovoltaic field area;

[0010] A sand fixation and fog capture unit, comprising a three-dimensional net with a porosity of 50-80%, the three-dimensional net being arranged on the periphery of the elevated photovoltaic support and enclosing to form a grid structure;

[0011] The biological sand fixation unit includes plants planted at one or more positions including the upwind drip line of the inclined sand-blocking and fog-catching barrier, the inside or outside of the sand-fixing grid, and the lower periphery of the grid structure.

[0012] Furthermore, the photovoltaic panel is arranged at an angle.

[0013] Furthermore, a plurality of the elevated photovoltaic supports are arranged in a rectangular array on the surface of moving sand dunes, Gobi or desert.

[0014] Furthermore, the elevated photovoltaic support includes multiple upper sections of columns, multiple beams and multiple first cross bars, and the multiple upper sections of the columns are arranged on the ground in a polygonal or circular shape. The elevated photovoltaic support frame includes several first columns, and the first columns are inserted into the ground. A cross beam is fixedly installed between two adjacent first columns, and a plurality of first cross bars are fixedly installed between two opposite beams. The photovoltaic panel is set on the first cross bars.

[0015] Furthermore, the first column includes a base, a column lower section and a column upper section which are arranged in sequence from bottom to top, the base is buried under the ground surface, the column lower section is fixedly connected to the base, the column upper section is arranged on the column lower section, and the crossbeam is arranged on the column upper section.

[0016] Furthermore, the cross beam and the upper section of the column, and the first cross bar and the cross beam are all detachably connected.

[0017] Furthermore, a first connecting member is provided on the upper section of the column, the first connecting member can move along the axial direction of the upper section of the column, a first limiting groove is provided on the first connecting member, a first limiting tenon is provided on the crossbeam, and the first limiting tenon is inserted in the first limiting groove to achieve limiting and form a connection;

[0018] The crossbeam is provided with a second connecting piece, the second connecting piece is provided with a second limiting groove, the first crossbar is provided with a second limiting tenon, the second limiting tenon is inserted in the second limiting groove to achieve limiting and form a connection.

[0019] Furthermore, the first cross bar and the end surface of the photovoltaic panel are fixedly connected via a connecting piece.

[0020] Furthermore, the heights of the upper section of the column and the lower section of the column are both 3 to 5 meters, and the depth of the base buried under the ground surface is 2 to 5 meters.

[0021] Furthermore, the upper section of the column is provided with a plurality of limiting holes along the axial direction, and limiting screws are inserted into the limiting holes to fix the first connecting member at the position of any limiting hole along the axial direction of the upper section of the column.

[0022] Furthermore, the distance between the photovoltaic panel and the ground surface is adjustable between 3m and 10m.

[0023] Furthermore, the plurality of photovoltaic panels cooperate with the sand-fixing and fog-catching units to form a semi-enclosed cover-like structure.

[0024] Furthermore, the sand-blocking and fog-catching plate is a wave plate having a first surface and a second surface facing each other, the second surface being arranged toward the ground, the first surface forming an angle greater than 0 and less than 90° with a horizontal plane, a plurality of protrusions being arranged on the first surface, the fog-catching mechanism comprising a plurality of protrusions staggered on the first surface, at least the protrusions and the protrusions being covered with a hydrophilic base film, the first surface also forming a guide groove, at least the groove wall of the guide groove being covered with a hydrophobic base film.

[0025] Furthermore, the sand-blocking and mist-catching plate and the plurality of protrusions are combined at different spatial scales to form a wave-like spatial structure.

[0026] Furthermore, the plurality of guide grooves are parallel to each other, and an angle formed by the guide grooves and a horizontal plane is 25° to 60°.

[0027] Furthermore, the angle formed between the first surface of the sand-blocking and mist-catching plate and the horizontal plane is 25° to 60°.

[0028] Furthermore, the sand-blocking and mist-catching plate bracket includes a second column, a second crossbar and a base, the base is buried under the ground surface, and the second column is fixedly connected to the base.

[0029] Furthermore, the sand-fixing grid includes grass fiber foamed cement boards and splicing pieces, and every four grass fiber foamed cement boards distributed in a cross shape are connected by the splicing pieces. A plurality of holes are provided on the top of the grass fiber foamed cement boards, and the holes are used for inserting tree branches.

[0030] Furthermore, the side length of the sand-fixing grid is 1 to 3 m, and the overall height is 40 to 120 cm.

[0031] Furthermore, the straw fiber foamed cement board has a length of 1 to 3 m and a height of 20 to 60 cm.

[0032] Furthermore, the height of the plant branches inserted into the top of the grass fiber foamed cement board is 20 to 60 cm.

[0033] The sand-fixing and fog-catching unit is arranged between the elevated anti-sand-burying photovoltaic device and the ground surface, and is used to fix the quicksand at the bottom of the elevated anti-sand-burying photovoltaic device, capture moisture in the airflow and irrigate the vegetation at the bottom of the sand-fixing and fog-catching net, thereby suppressing the impact of the terrain undulations on the elevated anti-sand-burying photovoltaic device.

[0034] Furthermore, the three-dimensional net is formed by winding nylon threads, part of the nylon threads are extended and wound in the vertical direction and a hydrophilic material film is plated on the surface of the nylon threads, and another part of the nylon threads are extended and wound in the horizontal direction and a hydrophobic material film is plated on the surface of the nylon threads.

[0035] Furthermore, the three-dimensional net includes a plurality of first wire loops and a plurality of second wire loops, the first wire loops are formed by nylon wires extending and winding in a vertical direction, and the second wire loops are formed by nylon wires extending and winding in a horizontal direction, and the surfaces of the first wire loops and the second wire loops are respectively covered with a hydrophilic material film and a hydrophobic material film, and the ratio of the number of the first wire loops to the number of the second wire loops is greater than 4.

[0036] Furthermore, the thickness of the three-dimensional net is 0.5 to 3 cm.

[0037] Furthermore, the diameter of the nylon filaments used to form the three-dimensional net is 0.3-2 mm.

[0038] Furthermore, the height of the lattice structure is 2 to 4 m, and the width is 5 to 10 m.

[0039] Compared with the prior art, the advantages of the present invention include:

[0040] 1. An elevated photovoltaic and sand prevention system provided by the embodiment of the present invention keeps all photovoltaic panels away from the sand surface of the ground, and the sand blocking and fog capturing system blocks sand at the front edge. The sand fixing and fog capturing unit and a number of photovoltaic panels together form a semi-enclosed inverted box structure, which effectively reduces the wind energy in the field area and the disturbance to the underlying surface (i.e. the sand surface of the ground), so that the photovoltaic components are protected from wind and sand hazards such as burial and erosion by quicksand, and are not affected by changes in terrain undulations;

[0041] 2. The bottom of the sand-fixing grid in an elevated photovoltaic and sand-control system provided by the embodiment of the present invention is a grass fiber foamed cement board, which is light in material, high in strength and environmentally friendly. Compared with traditional material boards, it is easy to carry and construct, and has low cost; the top of the grass fiber foamed cement board is cut to set a biological sand-fixing unit, that is, plant leaves, which are flexible materials and absorb wind energy and sand kinetic energy by swinging, thereby enhancing the wind-blocking and sand-fixing effect of the overall grid structure, and also has the advantages of low difficulty in obtaining materials and convenient construction;

[0042] 3. A three-dimensional net in an elevated photovoltaic and sand-control system provided by an embodiment of the present invention has a sand-blocking and sand-fixing efficiency that is superior to that of common sand-blocking barriers and sand-fixing grids, and has an added fog-catching function. The nylon yarns extending and winding in the vertical direction and in the horizontal direction respectively have spatial heterogeneous distribution characteristics of hydrophilic and hydrophobic substances, and can more efficiently and automatically collect and utilize water vapor in the airflow in a specific area, automatically irrigate vegetation, and restore the ecology and improve the environment;

[0043] 4. The sand-blocking and fog-catching plate in an elevated photovoltaic and sand-prevention system provided by the embodiment of the present invention has a fog-catching mechanism on its surface. The convex and protruding parts of the sand-blocking and fog-catching plate have large areas and steep slopes, and are covered with a hydrophilic base film, which is conducive to capturing the falling of fog and small droplets; the guide groove is covered with a hydrophobic base film, which makes it easy for water droplets to slide to the drip line for irrigating vegetation; therefore, the sand-blocking and fog-catching plate has multiple functions of sand blocking, fog catching, and irrigation, and the convex and wavy shapes distributed on it greatly increase its wind resistance and contact area, and have high efficiency in sand blocking and fog catching;

[0044] 5. An elevated photovoltaic and sand control system provided by an embodiment of the present invention is composed of an elevated photovoltaic system, a sand blocking and fog capturing system, a sand fixation system, a biological sand fixation unit and a sand fixation and fog capturing unit to form a complete photovoltaic ecological sand fixation system. The system can completely solve the sand damage problem faced by the photovoltaic field in an extreme wind and sand environment, has a significant sand control effect, combines engineering and biology, has a long engineering life and strong sustainability. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of an elevated photovoltaic and sand prevention system provided in a typical implementation case of the present invention;

[0046] Figure 2 It is a structural schematic diagram of a first connecting member of an elevated photovoltaic and sand prevention system provided in a typical implementation case of the present invention;

[0047] Figure 3 It is a structural schematic diagram of a second connecting member of an elevated photovoltaic and sand prevention system provided in a typical implementation case of the present invention;

[0048] Figure 4It is a structural schematic diagram of a connecting piece of an elevated photovoltaic and sand-proof system provided in a typical implementation case of the present invention;

[0049] Figure 5 It is a structural schematic diagram of a sand-fixing grid of an elevated photovoltaic and sand-control system provided in a typical implementation case of the present invention;

[0050] Figure 6 It is a structural schematic diagram of a splicing component of an elevated photovoltaic and sand-proof system provided in a typical implementation case of the present invention;

[0051] Figure 7 It is a structural schematic diagram of a sand-blocking and fog-catching plate of an elevated photovoltaic and sand-prevention system provided in a typical implementation case of the present invention;

[0052] Figure 8 It is a side view of a sand-blocking and fog-catching plate of an elevated photovoltaic and sand-prevention system provided in a typical implementation case of the present invention;

[0053] Fig. 9 It is a structural schematic diagram of a raised portion and a guide groove on a sand-blocking and fog-catching plate of an elevated photovoltaic and sand-prevention system provided in a typical implementation case of the present invention;

[0054] Fig.10 It is a structural schematic diagram of an elevated photovoltaic and sand prevention system provided in a typical implementation case of the present invention;

[0055] Fig.11 It is a schematic diagram of the structure of the first column in an elevated photovoltaic and sand prevention system provided in a typical implementation case of the present invention;

[0056] Fig.12 It is a structural schematic diagram of an elevated anti-sand burial photovoltaic device array arrangement provided in another typical implementation case of the present invention.

[0057] Description of reference numerals:

[0058] 1. First column; 11. Lower column section; 12. Upper column section; 13. First connector; 131. First stop slot; 14. Stop screw; 15. Base; 2. Crossbeam; 21. First stop tenon; 22. First screw; 23. Second connector; 231. Second stop slot; 3. First crossbar; 31. Connecting piece; 32. Photovoltaic panel; 33. Second stop tenon; 34. Second screw; 4. Elevated anti-sand buried photovoltaic volt device; 5, sand fixation grid; 51, grass fiber foamed cement board; 52, biological sand fixation unit; 53, splicing piece; 6, inclined sand blocking and fog catching barrier; 61, second column; 62, sand blocking and fog catching plate; 621, raised part; 622, guide groove; 623, protrusion; 63, base; 64, fixing piece; 65, sand-dwelling plant; 66, second cross bar; 67, ground surface; 7, moving sand dunes; 8, main wind direction; 9, three-dimensional net. DETAILED DESCRIPTION

[0059] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The technical solution, its implementation process and principle will be further explained as follows.

[0060] See also Figures 1 to 11, which is an elevated photovoltaic and anti-sand system of the first embodiment of the present invention, comprising: a photovoltaic unit, including a plurality of elevated anti-sand buried photovoltaic devices 4 arranged in an array in a photovoltaic field area, the elevated anti-sand buried photovoltaic device 4 comprising a photovoltaic panel 32 and an elevated photovoltaic bracket, the elevated photovoltaic bracket at least used to support the photovoltaic panel 32, and to make the distance between the photovoltaic panel 32 and the ground surface 67 adjustable, and to make the minimum distance between the photovoltaic panel 32 and the ground surface 67 above a set value, so as to ensure that the elevated anti-sand buried photovoltaic device 4 avoids the hazards of sand burial, abrasion and the like caused by the terrain change of the ground surface 67; a sand blocking and fog catching unit, comprising an inclined sand blocking and fog catching barrier 6 arranged in the upwind edge area of ​​the photovoltaic field area, which is the main wind direction 8 in this embodiment, the inclined sand blocking and fog catching barrier 6 comprises a plurality of sand blocking and fog catching plates 62, and the plurality of sand blocking and fog catching plates 62 are installed in parallel on the sand blocking and fog catching plate 62 bracket and distributed in the vertical direction, forming a The structure is formed into a louver structure, and the surface of the sand-blocking and fog-catching plate 62 is provided with a fog-catching mechanism for reducing wind speed, blocking quicksand and capturing moisture in the air; the engineering sand-fixing unit includes a sand-fixing grid 5, which is arranged at one or more positions in the inter-hill area, the foot of the windward slope of the sand dunes and the middle area of ​​the slope within the photovoltaic field area, and the engineering sand-fixing unit is used to suppress the start of quicksand on the surface 67; the sand-fixing and fog-catching unit includes a three-dimensional net 9 with a permeability of 50-80%, which is arranged on the periphery of the elevated photovoltaic support and enclosed to form a grid structure; the biological sand-fixing unit 52 includes plants planted at one or more positions at the upwind drip line of the inclined sand-blocking and fog-catching barrier 6, inside or outside the sand-fixing grid 5 and at the lower edge of the grid structure, for long-term stabilization of the quicksand on the surface 67, and the above-mentioned plants can be sand-dwelling shrubs such as Nitraria thorni, Haloxylon ammodendron, Calligonum mongolicum, Ephedra sinica, Astragalus membranaceus, and Licorice.

[0061] It should be noted that the large-scale photovoltaic power field of the prior art occupies a large area, and the inclined sand-blocking and fog-catching barriers 6 set at the upwind edge can only suppress the high-altitude wind speed at the edge of the field, but cannot suppress the wind speed inside the field. The long-term accumulation of the fluctuation of the internal sand dunes will reduce the clearance height under the board and threaten the board surface. Therefore, an elevated photovoltaic and sand-control system of the first embodiment of the present invention utilizes the sand-fixing and fog-catching units set on the support columns to form a tall grid structure to suppress the high-altitude wind speed inside the field; the first embodiment of the present invention combines the sand-fixing grids 5 set on the inter-hill surface 67, which can cooperate and complement each other at the high altitude and surface 67 levels in the vertical direction, and can also cooperate and complement each other at the edge and internal area in the plane position, so as to achieve the purpose of reducing wind speed in the entire field, leveling sand dunes, fixing quicksand, and maintaining the ultra-high board clearance height for a long time.

[0062] The sand-fixing and fog-catching unit and a number of photovoltaic panels 32 together form a semi-enclosed cover structure, which effectively reduces the wind energy in the site and the disturbance to the underlying surface, and protects the photovoltaic components from wind and sand hazards such as burial and erosion by quicksand.

[0063] The first embodiment of the present invention takes engineering measures as a guide to suppress air flow speeds at different heights and settle and fix sand particles; it uses automatic water vapor collection and irrigation measures combined with plant measures to achieve the purpose of sustainable flattening and fixing the mobile sand dunes 7.

[0064] Furthermore, in the large-scale mobile sand dune area 7, the sand surface is loose and the terrain is undulating violently. It is necessary to maintain low wind speed at the edge and inside of the photovoltaic field area to prevent local sand blowing and terrain fluctuations. To achieve this purpose, the large photovoltaic panels 32 at high levels will isolate the upper airflow, causing the airflow under the panel to lose the drag effect of the upper airflow and slow down. At the same time, the weakened airflow under the panel is blocked by the tall grid structure formed by the sand-fixing and fog-catching unit and the sand-fixing grid 5 on the surface 67 to form a turbulent flow under the panel, so that the velocity of the weakened airflow under the panel will be further reduced. Therefore, the first embodiment of the present invention can reduce the overall space wind speed under the panel, and achieve the purpose of isolating the hazards of quicksand and fixing quicksand for a long time in the large-scale photovoltaic power station area of ​​Shagohuang.

[0065] The plants are distributed at the lower edge of the inclined sand-blocking and fog-catching barrier 6. The barrier provides protection, shade, and irrigation for the plant seedlings, promoting their growth. When the plants grow up, sand accumulates at the base of the barrier, and the sand pile formed strengthens the base structure of the barrier.

[0066] The photovoltaic panel 32 is set at an angle; a plurality of elevated photovoltaic brackets are arranged in a rectangular array on the mobile sand dunes 7, Gobi or desert surface 67; the elevated photovoltaic bracket includes a plurality of column upper sections 12, a plurality of beams 2 and a plurality of first cross bars 3, and the plurality of column upper sections 12 are arranged on the ground in a polygonal or circular shape, and the elevated photovoltaic support frame includes a plurality of first columns 1, the first columns 1 are inserted into the ground surface 67, a cross beam 2 is fixedly arranged between two adjacent first columns 1, and a plurality of first cross bars 3 are fixedly arranged between two opposite cross beams 2, and the photovoltaic panel 32 is arranged on the first cross bar 3. It should be noted that in the present embodiment, the four first columns 1 of the elevated photovoltaic support frame are all arranged nearly vertically to the ground surface 67, that is, the four first columns 1 and the plurality of cross beams 2 form a frame that is almost rectangular.

[0067] The first column 1 includes a base 15, a column lower section 11 and a column upper section 12 which are arranged in sequence from bottom to top, the base 15 is buried below the ground surface 67, the column lower section 11 is fixedly connected to the base 15, the column upper section 12 is arranged on the column lower section 11, and the crossbeam 2 is arranged on the column upper section 12; the crossbeam 2 and the column upper section 12, and the first crossbar 3 and the crossbeam 2 are all detachably connected.

[0068] A first connecting member 13 is provided on the upper section 12 of the column, and the first connecting member 13 can move along the axial direction of the upper section 12 of the column, and a first limiting groove 131 is provided on the first connecting member 13, and a first limiting tenon 21 is provided on the cross beam 2, and the first limiting tenon 21 is inserted in the first limiting groove 131 to achieve limiting and form a connection; a second connecting member 23 is provided on the cross beam 2, and a second limiting groove 231 is provided on the second connecting member 23, and a second limiting tenon 33 is provided on the first cross bar 3, and the second limiting tenon 33 is inserted in the second limiting groove 231 to achieve limiting and form a connection; the end faces of the first cross bar 3 and the photovoltaic panel 32 are fixedly connected by the connecting piece 31; the height of the upper section 12 of the column and the lower section 11 of the column are both 3 ~5m, the depth of the base 15 buried below the ground surface 67 is 2~5m; a plurality of limit holes are opened axially on the upper section 12 of the column, and limit screws 14 are inserted in the limit holes to fix the first connecting member 13 at the position of any limit hole along the axial direction of the upper section 12 of the column; the distance between the photovoltaic panel 32 and the ground surface 67 is adjustable between 3m and 10m, and this height can completely isolate the photovoltaic panel 32 from the wind and sand flow on the ground surface 67, so as to avoid various hazards caused by wind and sand; in addition, the high-altitude airflow is relatively clean, the cleaning frequency of the photovoltaic panel 32 is reduced, the cleaning cost is saved, and it has the advantages of long engineering life and less maintenance; multiple photovoltaic panels 32 cooperate with the sand-fixing and fog-catching units to form a semi-closed cover-like structure.

[0069] It should be noted that the upper section 12 of the column is a cylinder. The main purpose of setting the upper section 12 of the column as a cylinder is to realize the up and down movement of the beam 2, that is, the first connecting member 13 can move up and down in the upper section 12 of the column. When it moves to an appropriate height, the height of the beam 2 can be fixed by the limit screw 14, thereby adjusting the height of the photovoltaic panel 32 from the ground; the lower section 11 of the column is a cone, and the diameter of the lower section 11 of the column gradually decreases from bottom to top. The conical lower section 11 of the column is to improve the stability of the lower section 11 of the column, save material costs and reduce the weight of the lower section, and is easy to construct. The four first columns 1 are arranged in a rectangle with equal spacing (5 to 10 mm), and the long side formed is perpendicular to the main wind direction 8.

[0070] The sand-blocking and fog-catching plate 62 is made of a polymer material such as polyethylene and HDPE. The sand-blocking and fog-catching plate 62 is a corrugated plate having a first surface and a second surface facing each other. The second surface is arranged toward the ground, and the first surface forms an angle greater than 0 and less than 90° with the horizontal plane. The fog-catching mechanism includes a plurality of protrusions 621 staggeredly distributed on the first surface. The surfaces of the protrusions 621 and the protrusions 623 are covered with a hydrophilic base film, which is used to capture moisture in the air and form water droplets, and make the water droplets slide down the steep surface of the protrusions 621. As for the guide groove 622, a guide groove 622 is also provided on the sand-blocking and fog-catching plate 62, and a hydrophobic base film is covered on the groove wall of the guide groove 622, which is used to collect water droplets formed on the protrusion 621, and under the action of the hydrophobic base film and gravity, the water droplets are dripped through the guide groove 622 to the biological sand fixation unit 52 located on the inclined sand-blocking and fog-catching barrier 6; the setting of the protrusion 621 is beneficial to increase the surface area and wind-blocking efficiency of the sand-blocking and fog-catching plate 62. It can be seen that the sand-blocking and fog-catching plate 62 plays the triple role of wind blocking, sand blocking and fog catching.

[0071] The wave plate and the multiple protrusions 621 distributed thereon are combined to form a wave-like spatial structure at different spatial scales; a hydrophobic base film is continuously covered on the groove wall of the guide groove 622; the multiple guide grooves 622 are parallel to each other; the angle formed between the first surface of the sand-blocking and fog-catching plate 62 and the horizontal plane is 25° to 60°; the bracket of the sand-blocking and fog-catching plate 62 includes a second column 61, a second cross bar 66 and a base 63, the base 63 is buried under the ground surface 67, and the second column 61 is fixedly connected to the base 63.

[0072] It should be noted that each sand blocking and mist catching plate 62 has a length of 2 to 5 m and a width of 30 to 60 cm, a bottom diameter of the raised portion 621 of 0.5 to 3 cm, and a height of the raised portion 621 of 0.5 to 3 cm. The biological sand fixation unit 52 is arranged at the automatic irrigation drip line below the sand blocking and mist catching plate 62. The mist droplets in the air flow contact with the hydrophilic base material at the raised portion 621 and the protrusion 623 to form small droplets, which are promoted to flow to the guide groove 622 under the action of gravity. The hydrophobic base material in the guide groove 622 is conducive to the gathering of droplets and their dripping to the drip line on the ground under the action of gravity, thereby irrigating the biological sand fixation unit 52, and playing a role in blocking and fixing the quicksand; and each sand-blocking and fog-catching plate 62 is arranged horizontally on the second cross bar 66 from bottom to obliquely above along the wind direction, and multiple second cross bars 66 are fixed in parallel on the second column 61 through fixing parts 64, so that the multiple sand-blocking and fog-catching plates 62 form a shutter structure as a whole.

[0073] The structure of the sand-blocking and fog-catching plate 62 simulates the raised portion 621 and groove structure on the surface of the desert beetle shell, as well as the different spatial distribution characteristics of hydrophobic and hydrophilic substances at different concave and convex parts. While increasing the surface area, it can effectively increase the ability and efficiency of the material to capture water vapor from the airflow. In addition, due to the setting of the raised portion 621, the roughness of the sand-blocking and fog-catching plate 62 is increased, which can also increase its wind-blocking efficiency.

[0074] The sand-fixing grid 5 includes a grass fiber foamed cement board 51 and a splicing piece 53. Every four grass fiber foamed cement boards 51 distributed in a cross are connected by the splicing piece 53. A plurality of holes are provided on the top of the grass fiber foamed cement board 51 for inserting tree branches. The side length of the sand-fixing grid 5 is 1 to 3 m, and the overall height is 40 to 120 cm. The length of the grass fiber foamed cement board 51 is 1 to 3 m, the height is 20 to 60 cm, and the thickness is 2 to 5 cm. The height of the plant branches inserted into the top of the grass fiber foamed cement board 51 is 20 to 60 cm.

[0075] The grass fiber is made of tanned wheat straw, corn stalks and other crop stalks or natural grass such as Gramineae, mixed in a certain proportion with foamed cement, and then pressed into a grass fiber foamed cement board 51 by a brick-making machine. The sand-fixing grid 5 is set in the low land between dunes, the foot and the middle of the windward slope of the dunes in the photovoltaic field, that is, on the mobile sand dunes 7, to inhibit the start of quicksand, fix the sand on the surface 67 of the photovoltaic field, reduce the height of the dunes by blocking the front and pulling the back, prevent the dunes from moving forward, and fix the dunes.

[0076] Specifically, this embodiment also provides a method for making a grass fiber foamed cement material, comprising:

[0077] S1. preparing plant fiber;

[0078] S2, preparing foamed cement;

[0079] S3, mixing the grass fiber and the foamed cement evenly, and injecting the mixture into a film pressing machine for film pressing;

[0080] Among them, the grass fiber in S1 is tanned from natural plant materials, specifically, the grass fiber is tanned from natural plant materials such as wheat straw and rice straw; the foamed cement in S2 is mixed with a foaming agent and cement in a certain proportion; the grass fiber and foamed cement in S3 are evenly mixed in a certain proportion and injected into a film pressing machine to produce the above-mentioned grass fiber foamed cement board 5151.

[0081] The grass fiber foamed cement material provided in this embodiment has low density, light material, and can float on the water surface. Due to the addition of grass fiber, its strength is also greatly improved. It has the advantages of being economical, environmentally friendly, low-cost, and easy to construct.

[0082] The elevated photovoltaic and sand prevention system also includes a sand fixation and fog capture unit, which is arranged between the elevated anti-sand buried photovoltaic device 4 and the ground surface 67, and is used to fix the quicksand at the bottom of the elevated anti-sand buried photovoltaic device, capture water vapor in the air flow and irrigate the vegetation at the lower edge of the three-dimensional network 9, thereby suppressing the impact of the terrain undulations of the ground surface 67 on the elevated anti-sand buried photovoltaic device.

[0083] The sand-fixing and fog-catching unit is a three-dimensional net 9 formed by winding nylon threads, part of which is extended and wound in the vertical direction and coated with a hydrophilic material film on the surface of the nylon threads, and the other part of which is extended and wound in the horizontal direction and coated with a hydrophobic material film on the surface of the nylon threads.

[0084] The three-dimensional net 9 includes a plurality of first wire loops and a plurality of second wire loops, wherein the first wire loops are formed by extending and winding nylon wires in a vertical direction, and the second wire loops are formed by extending and winding nylon wires in a horizontal direction, and the surfaces of the first wire loops and the second wire loops are respectively covered with a hydrophilic material film and a hydrophobic material film, and the ratio of the number of the first wire loops to the number of the second wire loops is greater than 4, that is, the three-dimensional net 9 is wound into a three-dimensional space structure in the shape of a wire loop, wherein the first wire loops are the majority (more than 80%) and are plated with a hydrophilic material film; the second wire loops are the minority (less than 20%) and are plated with a hydrophobic material film; the thickness of the three-dimensional net 9 is 0.5 to 3 cm; the diameter of the nylon wire used to form the three-dimensional net 9 is 0.3 ~2mm; the height of the grid structure is 2~4m, and the width is 5~10m. Since water vapor needs to pass through the three-dimensional net 9 more smoothly to promote its condensation, the permeability of the three-dimensional net 9 is much higher than that of the sand-blocking net (30~50%), generally 50~80%, and the thickness is 0.5~3 cm. The diameter of the nylon wire that makes up the three-dimensional net 9 is 0.3~2mm. The three-dimensional net 9 is used as a sand-fixing and fog-catching unit. Its sand-blocking and sand-fixing efficiency is better than that of ordinary sand-fixing barriers and sand-fixing grids 5, and the fog-catching function is added. The three-dimensional net 9 wire loops have the spatial heterogeneous distribution characteristics of hydrophobic and hydrophilic substances, which can automatically collect and utilize water vapor in the airflow in a specific area more efficiently, automatically irrigate vegetation, restore ecology and improve the environment.

[0085] The frame formed by the four first columns 1 of the elevated photovoltaic support frame in this embodiment is pyramid-shaped, that is, the cross-section obtained by horizontally intercepting the space wrapped by the frame gradually increases in area from bottom to top.

[0086] See also Fig.12, is an elevated photovoltaic and sand prevention system of the first embodiment of the present invention. The structure of this embodiment is basically the same as that of the first embodiment, but the difference is that the sand-fixing and fog-catching unit of this embodiment is arranged between the photovoltaic panel 32 and the ground surface 67, specifically, the sand-fixing and fog-catching unit is attached to the ground surface 67, and a plurality of elevated anti-sand buried photovoltaic devices 4 are arranged in array on the ground surface 67. The three-dimensional net 9 of the sand-fixing and fog-catching unit is arranged in contact with the ground surface, which can block and fix the quicksand moving along the ground, and can also block the quicksand moving in the high-altitude layer; the height of the square structure formed by the three-dimensional net 9 is 2 to 4 meters, and the side length is 5 to 10 meters. This high vertical large grid structure, combined with the large-area photovoltaic panel 32 at the top, forms a cover-shaped semi-enclosed space structure, which blocks the top airflow and suppresses the flow rate of the bottom airflow, and can play a role in suppressing wind and sand at all height layers.

[0087] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An elevated photovoltaic and sand prevention system, characterized in that: include: A photovoltaic unit, comprising a plurality of elevated anti-sand burial photovoltaic devices (4) arranged in an array in a photovoltaic field area, wherein the elevated anti-sand burial photovoltaic device (4) comprises a photovoltaic panel (32) and an elevated photovoltaic bracket, wherein the elevated photovoltaic bracket is at least used to support the photovoltaic panel (32), and the distance between the photovoltaic panel (32) and the ground surface (67) is adjustable, and the minimum distance between the photovoltaic panel (32) and the ground surface (67) is greater than a set value; A sand blocking and fog catching unit, comprising an inclined sand blocking and fog catching barrier (6) arranged at an upwind edge region of the photovoltaic field, the inclined sand blocking and fog catching barrier (6) comprising a plurality of sand blocking and fog catching plates (62), the plurality of sand blocking and fog catching plates (62) being installed in parallel on a sand blocking and fog catching plate (62) bracket and distributed in a vertical direction to form a shutter structure, and a fog catching mechanism being provided on the surface of the sand blocking and fog catching plate (62); An engineering sand fixation unit comprises a sand fixation grid (5), wherein the sand fixation grid (5) is arranged at one or more positions in the inter-dune zone, the foot of the windward slope of the sand dune and the mid-slope area within the photovoltaic field area; A sand-fixing and fog-catching unit comprises a three-dimensional net (9) with a porosity of 50 to 80%, wherein the three-dimensional net (9) is arranged on the periphery of the elevated photovoltaic support and encloses to form a grid structure; The biological sand fixation unit (52) comprises plants planted at one or more positions including the upwind drip line of the inclined sand-blocking and fog-catching barrier (6), the inside or outside of the sand fixation grid (5), and the lower periphery of the grid structure.

2. The elevated photovoltaic and sand prevention system according to claim 1, characterized in that: The photovoltaic panel (32) is arranged tilted; And / or, a plurality of the elevated photovoltaic supports are arranged in a rectangular array on a moving sand dune (7), a Gobi desert or a desert surface (67); And / or, the elevated photovoltaic support comprises a plurality of column upper sections (12), a plurality of cross beams (2) and a plurality of first cross bars (3), the plurality of column upper sections (12) are arranged on the ground in a polygonal or circular shape, the elevated photovoltaic support frame comprises a plurality of first columns (1), the first columns (1) are inserted into the ground surface (67), a cross beam (2) is fixedly arranged between two adjacent first columns (1), a plurality of first cross bars (3) are fixedly arranged between two opposite cross beams (2), and the photovoltaic panel (32) is arranged on the first cross bars (3).

3. The elevated photovoltaic and sand prevention system according to claim 2 is characterized in that: The first column (1) comprises a base (15), a column lower section (11) and a column upper section (12) which are arranged in sequence from bottom to top, the base (15) is buried under the ground surface (67), the column lower section (11) is fixedly connected to the base (15), the column upper section (12) is arranged on the column lower section (11), and the crossbeam (2) is arranged on the column upper section (12); And / or, the cross beam (2) and the upper section (12) of the column, and the first cross bar (3) and the cross beam (2) are all detachably connected.

4. The elevated photovoltaic and sand prevention system according to claim 3, characterized in that: The upper section (12) of the column is provided with a first connecting piece (13), the first connecting piece (13) can move along the axial direction of the upper section (12) of the column, the first connecting piece (13) is provided with a first limiting groove (131), the cross beam (2) is provided with a first limiting tenon (21), the first limiting tenon (21) is inserted into the first limiting groove (131) to achieve limiting and form a connection; The crossbeam (2) is provided with a second connecting piece (23), the second connecting piece (23) is provided with a second limiting groove (231), the first crossbar (3) is provided with a second limiting tenon (33), the second limiting tenon (33) is inserted into the second limiting groove (231) to achieve limiting and form a connection; And / or, the first cross bar (3) and the end surface of the photovoltaic panel (32) are fixedly connected via a connecting piece (31); and / or, the heights of the upper column section (12) and the lower column section (11) are both 3 to 5 m, and the depth of the base (15) buried below the ground surface (67) is 2 to 5 m; And / or, the upper column section (12) is provided with a plurality of limiting holes along the axial direction, and limiting screws (14) are inserted into the limiting holes to fix the first connecting member (13) at the position of any limiting hole along the axial direction of the upper column section (12); and / or, the distance between the photovoltaic panel (32) and the ground surface (67) is adjustable between 3m and 10m; And / or, a plurality of the photovoltaic panels (32) cooperate with the sand-fixing and fog-catching units to form a semi-enclosed cover-like structure.

5. The elevated photovoltaic and sand prevention system according to claim 4, characterized in that: The sand-blocking and fog-catching plate (62) is a wave plate having a first surface and a second surface facing each other, the second surface being arranged toward the ground, the first surface forming an angle greater than 0 and less than 90° with a horizontal plane, a plurality of protrusions (623) being arranged on the first surface, the fog-catching mechanism comprising a plurality of protrusions (621) staggeredly distributed on the first surface, at least the protrusions (621) and the protrusions (623) being covered with a hydrophilic base film, the first surface also forming a guide groove (622), at least the groove wall of the guide groove (622) being covered with a hydrophobic base film.

6. The elevated photovoltaic and sand prevention system according to claim 5, characterized in that: The sand-blocking and mist-catching plates and the plurality of protrusions are combined at different spatial scales to form a wave-like spatial structure; And / or, the plurality of guide grooves (622) are parallel to each other, and the angle formed by the guide grooves (622) and the horizontal plane is 25° to 60°; And / or, the angle formed between the first surface of the sand-blocking and mist-catching plate (62) and the horizontal plane is 25° to 60°; And / or, the support of the sand-blocking and mist-catching plate (62) comprises a second column (61), a second crossbar (66) and a base (63), wherein the base (63) is buried under the ground surface (67), and the second column (61) is fixedly connected to the base (63).

7. The elevated photovoltaic and sand prevention system according to claim 1, characterized in that: The sand-fixing grid (5) comprises a grass fiber foamed cement board (51) and a splicing piece (53), and every four grass fiber foamed cement boards (51) distributed in a cross shape are connected by the splicing piece (53), and a plurality of holes are provided on the top of the grass fiber foamed cement board (51), and the holes are used for inserting branches; And / or, the side length of the sand fixation grid (5) is 1 to 3 m, and the overall height is 40 to 120 cm; And / or, the length of the grass fiber foamed cement board (51) is 1 to 3 meters and the height is 20 to 60 cm And / or, the height of the plant branches inserted into the top of the grass fiber foamed cement board (51) is 20 to 60 cm.

8. The elevated photovoltaic and sand prevention system according to claim 1, characterized in that: The sand-fixing and fog-catching unit is arranged between the elevated anti-sand-burying photovoltaic device (4) and the ground surface (67), and is used to fix the quicksand at the bottom of the elevated anti-sand-burying photovoltaic device (4), capture moisture in the airflow and irrigate vegetation at the bottom of the sand-fixing and fog-catching net, thereby suppressing the influence of the terrain fluctuation of the ground surface (67) on the elevated anti-sand-burying photovoltaic device (4).

9. The elevated photovoltaic and sand prevention system according to claim 8, characterized in that: The three-dimensional net (9) is formed by winding nylon threads, part of the nylon threads are extended and wound in the vertical direction and a hydrophilic material film is plated on the surface of the nylon threads, and the other part of the nylon threads are extended and wound in the horizontal direction and a hydrophobic material film is plated on the surface of the nylon threads.

10. The elevated photovoltaic and sand prevention system according to claim 9, characterized in that: The three-dimensional net (9) comprises a plurality of first wire loops and a plurality of second wire loops, wherein the first wire loops are formed by nylon wires extending and winding in a vertical direction, and the second wire loops are formed by nylon wires extending and winding in a horizontal direction, and the surfaces of the first wire loops and the second wire loops are respectively covered with a hydrophilic material film and a hydrophobic material film, and the ratio of the number of the first wire loops to the number of the second wire loops is greater than 4; and / or, the thickness of the three-dimensional net (9) is 0.5 to 3 cm; and / or, the diameter of the nylon filaments used to form the three-dimensional net (9) is 0.3 to 2 mm; And / or, the height of the lattice structure is 2-4 m and the width is 5-10 m.

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