A photovoltaic power plant sand prevention and sand fixation system based on retired wind turbine blades and a construction method thereof

Abstract

The application discloses a photovoltaic power plant sand prevention and fixation system based on retired wind turbine blades and a construction method. The sand prevention and fixation system comprises a brush-shaped net rope sand prevention wall, a first sand barrier, a second sand barrier and a third sand barrier. The brush-shaped net rope sand prevention wall comprises a plurality of brush-shaped net ropes arranged in parallel in the vertical direction and is arranged in a wind and sand prevention zone. The first sand barrier comprises a grapevine branch type composite sand barrier and / or a straw flat type composite sand barrier and is arranged on the surface of the sand layer in the wind and sand prevention zone. The second sand barrier comprises a light-reflecting type simulation straw mat and is arranged on the surface of the sand layer below the photovoltaic panel. The third sand barrier comprises a plurality of independently arranged conical sand barriers and / or tribulus terrestris type sand barriers, the conical sand barriers or the tribulus terrestris type sand barriers comprise bent brush-shaped net ropes and are arranged on the surface of the sand layer in the inter-panel turbulence zone. The sand fixation system realizes accurate interception of wind sand and high-value utilization of the retired wind turbine blades, solves the problem of solid waste disposal and has the advantages of strong weather resistance, long service life, comprehensive sand prevention effect and the like.

Description

Technical Field

[0001] This invention belongs to the field of sand control and stabilization technology, specifically relating to a photovoltaic power plant sand control and stabilization system based on decommissioned wind turbine blades and its construction method. Background Technology

[0002] In desert and other areas severely affected by wind and sand erosion, the safe operation of photovoltaic power station infrastructure faces severe challenges. Long-term erosion and deposition by wind and sand can easily lead to problems such as sand accumulation on photovoltaic modules, equipment burial, and corrosion damage, directly impacting the operational efficiency and lifespan of the infrastructure. Particularly within 100-300m of the north, west, and east edges of the photovoltaic array, the airflow exhibits a regular and significant alternating spatial distribution pattern of acceleration and settling zones. Erosion beneath the panels and deposition between panels are currently the main wind and sand hazards faced by desert photovoltaic power stations. Figure 1 As shown.

[0003] Traditional sand control measures mainly consist of straw checkerboard barriers, straw dragon sand barriers, and single-plant sand barriers. While these methods offer advantages such as readily available raw materials and low cost, they suffer from a fatal flaw: poor weather resistance. In the harsh environment of desert regions, with strong ultraviolet radiation, wind erosion, large diurnal temperature variations, and frequent alternations between dry and wet conditions, natural materials such as straw and herbs are highly susceptible to decomposition and degradation, typically having a lifespan of only 3-5 years. This necessitates frequent maintenance and replacement of sand barriers, increasing not only labor and material costs but also causing secondary disturbances to the ecological environment of the protected area due to frequent construction, significantly raising the long-term operating costs of the project.

[0004] Meanwhile, with the rapid expansion of the global wind power industry, a large number of wind turbine blades have entered their retirement cycle. The main body of retired wind turbine blades is made of fiberglass composite material, which is characterized by high hardness, strong chemical stability, and difficulty in natural degradation. Currently, the mainstream disposal methods for retired wind turbine blades are landfill or incineration: landfill disposal requires a large amount of land resources, and the resin components in the blades may seep into the soil, causing pollution; incineration releases harmful gases, causing air pollution, and also wastes valuable composite material resources; fiberglass dust can easily cause irreversible damage to the lungs, and aging exposure can easily cause puncture wounds, making direct resource utilization a safety and environmental hazard. Statistics show that the total amount of retired wind turbine blades globally each year has reached hundreds of thousands of tons, highlighting the increasing pressure on solid waste disposal.

[0005] In existing technologies, some studies have attempted to apply recycled wind turbine blade materials to sand control projects. For example, the recycled materials are processed into rigid plates and laid vertically on the sand surface to form sand-fixing grids or high-rise sand barrier structures, or made into single-wire plane mesh for sand blocking. However, the above technologies have obvious limitations: rigid plates are hard and lack flexible blocking effect against wind and sand flow, resulting in weak wind suppression and sand blocking effects, and the on-site laying process is complex; the single mesh structure is a thin plane structure, and its wind suppression and sand fixing effects are not significant. It can only intercept part of the wind and sand flow and cannot achieve full-process protection of "wind blocking and sand settling-sand fixing-turbulence" for different sand hazard characteristics in different areas. It is difficult to meet the multi-dimensional wind and sand control needs of complex scenarios such as photovoltaic fields.

[0006] In summary, existing technologies lack a solution that can simultaneously address the challenges of solid waste disposal from decommissioned wind turbine blades, improve the lifespan and material safety of sand control projects, and achieve comprehensive wind and sand protection. Developing a multi-structure collaborative sand control system based on recycled wind turbine blade materials to achieve the dual goals of solid waste resource utilization and wind and sand control in photovoltaic power plants has become a pressing technical challenge in this field. Summary of the Invention

[0007] The main objective of this invention is to provide a photovoltaic power plant sand control and stabilization system and its construction method based on decommissioned wind turbine blades, so as to overcome the defects of the prior art.

[0008] To achieve the aforementioned objectives, the technical solution adopted by this invention includes: The first aspect of the present invention provides a photovoltaic electric field sand-fixing and sand-stabilizing system based on decommissioned wind turbine blades, comprising: A brushed mesh rope sand-blocking wall is set in the wind-blocking and sand-settling zone and is used at least to suppress wind and block sand. The brushed mesh rope sand-blocking wall includes multiple brushed mesh ropes arranged in parallel in the vertical direction. The first sand barrier is laid on the surface of the sand layer in the windbreak and sand-settling zone, and is used at least for the deposition of wind-blown sand. The first sand barrier includes a grape branch composite sand barrier and / or a straw-laid composite sand barrier. The second sand barrier, laid on the surface of the sand layer of the sand-fixing strip under the photovoltaic panel, is at least used to prevent the pillars from being eroded. The second sand barrier includes a reflective simulated thatch blanket. The third sand barrier is set on the surface of the sand layer in the turbulence zone, at least to disturb the flow field and thus suppress the development of the interplate sand accumulation zone. The third sand barrier includes multiple independently set cone-shaped sand barriers and / or caltrop-shaped sand barriers. The cone-shaped sand barriers or caltrop-shaped sand barriers include bent brush-like net ropes. The brush-shaped net rope includes a linear metal core skeleton and thick flat wires. The linear metal core skeleton is formed by multiple metal wires spirally twisted together along the axial direction. The multiple thick flat wires are clamped and fixed between the multiple spirally twisted metal wires, and the two ends of the thick flat wires extend outward radially from the linear metal core skeleton to form a circular brush-shaped structure. The brushed mesh rope sand-blocking wall and the first sand barrier are arranged in parallel to each other in the upwind direction of the photovoltaic panel. The length direction of the wind-blocking sand-settling belt is parallel to the edge direction of the photovoltaic field area. The turbulence zone is located between adjacent photovoltaic panel arrays. The length directions of the sand-fixing belt and the turbulence zone extend along the array direction of the photovoltaic panels.

[0009] A second aspect of the present invention provides a method for constructing a photovoltaic electric field sand-fixing and sand-control system based on decommissioned wind turbine blades, comprising: The main component of retired wind turbine blades is recycled resin. The main components of the retired wind turbine blades are uniformly mixed with the first anti-aging agent and then melt-extruded to produce thick flat filaments. The main components of the retired wind turbine blades are uniformly mixed with black masterbatch and second anti-aging agent, and then sequentially subjected to melt extrusion, blown film cooling, slitting and drawing to produce thin flat filaments. The main components of the retired wind turbine blades are uniformly mixed with the third anti-aging agent and lubricant, and then melt-plasticized and spun into fine round filaments. Multiple thick, flat filaments are spirally clamped and fixed, wound around a linear metal core skeleton, and formed into a circular brush-like structure to produce a brush-like net rope. Multiple brush-shaped net ropes are arranged in parallel in the vertical direction to form a brush-shaped net rope sand-blocking wall, and multiple brush-shaped net rope sand-blocking walls are set in the wind-blocking and sand-settling belt. The filler material is filled into the three-dimensional skeleton of grape branches to form a three-dimensional support network structure, resulting in a grape branch composite sand barrier; Natural adhesive is sprayed onto the surface of the straw layer and bonded and cured to form a single-layer structure; a straw layer is covered on the desert plant body layer, and the natural adhesive is sprayed onto the surface of the straw layer and bonded and cured to form a layered mixed structure; multiple periodic units of the single-layer structure or the layered mixed structure are stacked to obtain a straw-laid composite sand barrier. The grape branch-type composite sand barrier and / or straw-laying composite sand barrier constitute the first sand barrier, which is laid on the surface of the sand layer in the wind-blocking and sand-settling zone. Spiral reflective thick flat yarns are sewn onto the bottom mesh to make reflective simulated thatch blankets, forming a second sand barrier, which is then laid on the surface of the sand layer in the sand-fixing belt. At least the brush-like netting ropes are bent to create cone-shaped or caltrop-shaped sand barriers; Multiple cone-shaped and / or caltrop-shaped sand barriers are scattered on the surface of the sand layer in the turbulence zone to form a third sand barrier.

[0010] Compared with the prior art, the present invention has at least the following beneficial effects: (1) High-value utilization of solid waste with significant environmental benefits: This invention uses recycled material from retired wind turbine blades as the core raw material to prepare a sand-proof structure, which effectively solves the problem of solid waste disposal from wind turbine blades, realizes the resource recycling of "turning waste into treasure", and reduces the environmental pressure caused by landfilling and incineration of solid waste; at the same time, it reduces the dependence of traditional sand-proof materials on natural vegetation and protects ecological resources.

[0011] (2) Strong weather resistance and long service life: The flat wire of the wind turbine blade recycled material is added with special anti-aging components, which have excellent anti-ultraviolet, anti-wind erosion and anti-rot properties. Compared with traditional straw sand barriers, the service life of the sand prevention structure of the present invention is longer, which greatly reduces the long-term maintenance cost and secondary construction frequency of sand prevention projects.

[0012] (3) Flexible structure, adaptable to complex terrain: The brush-shaped net rope is made of metal wire as a skeleton and can be folded and bent into any shape. It is convenient to transport and easy to lay on site. The composite sand barrier (straw flat type, grape branch composite type), the reflective simulated thatch blanket under the board and the three sand-proof structures between the boards can all adjust the layout parameters (such as height, density, spacing, etc.) according to the site conditions such as the undulation of the sand dunes, the wind speed, and the protection requirements, and adapt to the complex desert terrain.

[0013] (4) Tiered prevention and control, comprehensive sand control effect: The "wind-blocking sand-sand-stabilizing-turbulence" composite protection system constructed by this invention implements precise prevention and control for the typical hazards of wind and sand flow in different areas of the photovoltaic power plant. The sand-blocking wall on the periphery of the photovoltaic power plant can suppress wind speed and create weak wind conditions for the deposition of quicksand in the downwind first sand barrier, grape branch composite sand barrier and / or straw flat composite sand barrier area. At the same time, it can block a certain amount of incoming sand. The first sand barrier, grape branch composite sand barrier and / or straw flat composite sand barrier, intercepts and settles most of the external sand intrusion source. The second sand barrier in the inner panel area, reflective simulated thatch blanket can fix the sand in the local area, suppress the erosion of the column base, and stabilize the sand surface elevation under the panel. The third sand barrier in the inner inter-panel area, cone-shaped sand barrier and / or caltrop-shaped sand barrier suppresses the wind speed between the panels, increases turbulence, and prevents the formation of sand accumulation zone between the panels. It forms a full-process, full-area protection, and the protection effect is far superior to a single sand barrier.

[0014] (5) Multifunctional and adaptable to photovoltaic scenarios: The reflective simulated thatch blanket used in this invention can realize the closed-loop utilization of recycled materials, combining wind turbine blades and waste photovoltaic panels, two major solid wastes, to make a photovoltaic panel underlay material with both sand fixation and reflective functions, solving the problem of high-value utilization of single recycled materials; it can also achieve synergy between structure and function. The three-dimensional structure of simulated thatch can not only fix sand and block sand, but its fluffy shape can also keep the reflective surface exposed to wind and sand, solving the pain point of traditional flat reflective film being prone to sand accumulation and failure; it can also achieve a balance between environmental protection and performance. Whether it is embedded reflective masterbatch or water-based coating, it highlights the environmental protection characteristics of no VOC and low pollution, meeting the weather resistance requirements of outdoor wind and sand environment. At the same time, the three-dimensional fluffy thatch structure forms a multi-angle diffuse reflection surface, which can evenly scatter the ground reflected light to the back of the photovoltaic panel, increasing the power generation efficiency of the back by 10%~15%. Moreover, the composite sand barrier around the photovoltaic field can flexibly utilize existing harmful invasive plants in the area, such as sand rice, sand wormwood, tumbleweed, etc., as well as agricultural waste and branches, to reduce raw material transportation costs and achieve the dual goals of wind and sand protection and power generation efficiency improvement.

[0015] (6) Mature technology and easy to industrialize and promote: The preparation of core raw materials and the processing of structures all adopt mature equipment such as mesh weaving, spiral weaving, extrusion molding and welding. There is no need for large-scale transformation of production lines, and the production efficiency is high. The on-site deployment method is simple and can be combined with mechanized construction to reduce labor costs. It is suitable for large-scale promotion and application in photovoltaic fields, traffic arteries, oilfield facilities and other scenarios.

[0016] (7) Controllable cost and outstanding economic benefits: The recycled materials of retired wind turbine blades, agricultural waste and waste photovoltaic panels are widely available and the raw material cost is low. Compared with sand-proof products made of new fiberglass materials, the raw material cost can be reduced by 30-50%. At the same time, the long service life and low maintenance requirements further reduce the cost of the entire life cycle of the project and have significant economic benefits. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a diagram showing the wind and sand damage to existing desert photovoltaic power plants; Figure 2 This is a schematic diagram of the overall layout of the photovoltaic power plant sand prevention and fixation system for photovoltaic power generation areas according to Embodiment 1 of the present invention; Figure 3This is a schematic diagram of the structure of the brush-like mesh rope sand-blocking wall according to an embodiment of the present invention; Figure 4 This is a side view schematic diagram of the spiral wire brush-shaped mesh rope according to an embodiment of the present invention; Figure 5 This is a cross-sectional schematic diagram of the spiral wire brush-shaped mesh rope according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the reflective spiral simulated thatch blanket structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the grape branch composite sand barrier according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the straw-laid composite sand barrier according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the caltrop-shaped sand barrier according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the triangular pyramidal sand barrier according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of the anti-tank cone-shaped sand barrier according to an embodiment of the present invention.

[0019] Attached reference numerals: 1-Brush-shaped mesh rope sand-blocking wall, 11-Spiral brush-shaped mesh rope, 111-Spiral thick flat wire, 112-Metal wire core layer skeleton, 113-Fixing buckle, 12-Post, 2-Grape branch composite sand barrier, 21-Grape branch three-dimensional skeleton, 22-Filling material, 3-Straw-laid composite sand barrier, 31-Straw layer, 4-Reflective spiral simulated thatch blanket, 41-Reflective spiral thick flat wire, 42-Bottom layer mesh, 5-Third sand barrier, 51-Barbed wire sand barrier, 52-Triangular pyramid sand barrier, 53-Anti-tank cone sand barrier, 11-Spiral brush-shaped mesh rope, 6-Photovoltaic field perimeter fence, 7-Photovoltaic panel, 8-Main wind direction, 9-Ground. Detailed Implementation

[0020] In view of the problems existing in the above-mentioned prior art, after in-depth research, a photovoltaic electric field sand prevention and fixation system based on retired wind turbine blades and its construction method are provided.

[0021] The following will provide a further explanation of the technical solution, its implementation process, and its principles.

[0022] The first aspect of the present invention provides a photovoltaic electric field sand-fixing and sand-stabilizing system based on decommissioned wind turbine blades, comprising: A brushed mesh rope sand-blocking wall is set in the wind-blocking and sand-settling zone and is used at least to suppress wind and block sand. The brushed mesh rope sand-blocking wall includes multiple brushed mesh ropes arranged in parallel in the vertical direction. The first sand barrier is laid on the surface of the sand layer in the windbreak and sand-settling zone, and is used at least for the deposition of wind-blown sand. The first sand barrier includes a grape branch composite sand barrier and / or a straw-laid composite sand barrier. The second sand barrier, laid on the surface of the sand layer of the sand-fixing strip under the photovoltaic panel, is at least used to prevent the pillars from being eroded. The second sand barrier includes a reflective simulated thatch blanket. The third sand barrier is set on the surface of the sand layer in the turbulence zone, at least to disturb the flow field and thus suppress the development of the interplate sand accumulation zone. The third sand barrier includes multiple independently set cone-shaped sand barriers and / or caltrop-shaped sand barriers. The cone-shaped sand barriers or caltrop-shaped sand barriers include bent brush-like net ropes. The brush-shaped net rope includes a linear metal core skeleton and thick flat wires. The linear metal core skeleton is formed by multiple metal wires spirally twisted together along the axial direction. The multiple thick flat wires are clamped and fixed between the multiple spirally twisted metal wires, and the two ends of the thick flat wires extend outward radially from the linear metal core skeleton to form a circular brush-shaped structure. The brushed mesh rope sand-blocking wall and the first sand barrier are arranged in parallel to each other in the upwind direction of the photovoltaic panel. The length direction of the wind-blocking sand-settling belt is parallel to the edge direction of the photovoltaic field area. The turbulence zone is located between adjacent photovoltaic panel arrays. The length directions of the sand-fixing belt and the turbulence zone extend along the array direction of the photovoltaic panels.

[0023] In some embodiments, the brush-like mesh rope has a dense brush-like protrusion structure.

[0024] In some implementations, the brush-like net rope has a diameter of 20-40 cm and a length of 5-50 m.

[0025] In some embodiments, the thick flat filament is in the form of a helical shape resembling a tension spring; In some embodiments, the pitch of the thick flat wire clamped and fixed on the core skeleton is 10~20cm.

[0026] In some implementations, the core skeleton is made of galvanized steel wire or stainless steel wire.

[0027] In some implementations, the diameter of the core skeleton is 2-3 mm.

[0028] In some implementations, the spiral brush-shaped mesh rope is also provided with fixing buckles every 1 to 2 meters.

[0029] In some implementation schemes, the height of the brushed mesh rope sand-blocking wall is 1-2m, and the parallel spacing between two adjacent brushed mesh rope sand-blocking walls is 10-30m.

[0030] In some implementations, the brushed mesh rope sand-blocking wall includes multiple horizontally arranged brushed mesh ropes and multiple vertically arranged columns. The columns are fixed on the ground and spaced apart from each other. The brushed mesh ropes are arranged in parallel and densely in the vertical direction and are fixedly connected to the columns.

[0031] Furthermore, the brushed mesh rope sand-blocking wall includes 5 to 10 horizontally arranged brushed mesh ropes and two sets of vertically arranged columns. The two sets of columns are fixed on the ground and spaced apart from each other. The multiple brushed mesh ropes are arranged in parallel and densely in the vertical direction and are fixedly connected to the two columns.

[0032] Furthermore, the two ends of the spiral wire brush-shaped net rope are respectively fixed to two uprights.

[0033] Furthermore, the brush-like net ropes arranged horizontally overlap by 5-10 cm.

[0034] Furthermore, the spacing between the two sets of columns is 1.5~3m.

[0035] Furthermore, the diameter of the column is 4~12cm, the exposed height is 1~2m, and the insertion depth into the sand surface is 40~60cm.

[0036] Furthermore, the material of the column includes at least one of steel and round wood.

[0037] Specifically, the thick flat filaments in this invention are made from scraps of retired wind turbine blades. The main component of retired wind turbine blades is fiberglass composite material, with epoxy resin / unsaturated polyester resin (matrix, accounting for 60-70%) and glass fiber (reinforcing phase, accounting for 25-35%) as the core, and also containing a small amount of curing agent, coupling agent and other additives. In the pretreatment stage, three types of impurities need to be precisely removed: first, metal embedded parts (such as bolts, steel liners, carbon fiber mandrels, etc., accounting for about 2-5%); second, resin layers that have aged and fallen off the surface, oil stains, wind and sand deposits and mixed impurities from damaged parts (accounting for about 3-8%); and third, glass fiber (accounting for 25-35%). Only the complete resin matrix (accounting for 60-70% of the original blade weight) is retained, which can meet the requirements of melt extrusion molding and is used to make the thick flat filaments in this invention.

[0038] The preparation method of the thick flat filaments described in this invention specifically includes: mixing a resin-glass fiber composite matrix with a first anti-aging agent in a high-speed mixer for 10-15 minutes to ensure the anti-aging agent is uniformly adhered to the surface of the fragments; then, feeding the blade matrix fragments mixed with the anti-aging agent into an extruder and melting and extruding them at 200-220°C; subsequently, stretching them through a customized extrusion die to obtain thick flat filaments. After cooling and setting, the filaments are wound up for later use; the anti-aging components are uniformly dispersed inside the flat filaments, enabling them to withstand strong ultraviolet radiation from the desert for a long time.

[0039] In some embodiments, the width of the thick flat wire is 2~10mm and the thickness is 0.5~2mm.

[0040] In some implementations, the thick flat filament is spiral-shaped.

[0041] In some embodiments, the raw materials for preparing the thick flat filaments include 95-97% recycled resin and 3-5% primary anti-aging agent.

[0042] In some preferred embodiments, the first anti-aging agent comprises a compound system of 1.5-2.5% benzotriazole UV absorber and 1.5-2.5% hindered phenolic antioxidant.

[0043] In some preferred embodiments, the particle size of the regenerated resin matrix is ​​1-3 cm.

[0044] In some embodiments, the grape branch composite sand barrier includes a three-dimensional framework of grape branches and a filler material, wherein the filler material is filled in the three-dimensional framework of grape branches to form a three-dimensional support network structure.

[0045] In some preferred embodiments, the three-dimensional framework of the grapevine branches is formed by the interweaving of multiple naturally curved grapevine branches, each with a diameter of 2-8 cm and a length of 0.5-3 m. The natural curvature of the grapevine branches allows them to weave and intertwine within the filler material, forming a three-dimensional support network structure. These grapevine branches can also serve as pruning waste in orchards, making it economical and environmentally friendly.

[0046] In some preferred embodiments, the filler includes at least one of straw, sand rice, sand wormwood, tumbleweed, and branches.

[0047] In some implementations, the shape of the grape branch-type composite sand barrier includes at least one of trapezoidal, arched, and planar shapes.

[0048] In some implementations, the thickness of the grape branch-type composite sand barrier is 50-100cm and the width is 1-5m.

[0049] In some implementations, grape branches are additionally interspersed on the surface of the grape branch composite sand barrier to at least enhance the fixation effect of the surface material.

[0050] In some embodiments, the surface of the grape branch composite sand barrier also includes a natural adhesive, which is used at least to fix the surface.

[0051] In some implementations, the straw-laid composite sand barrier includes a composite material layer with multiple periodic units stacked on top of each other, and the composite material layer is a single-layer structure or a layered mixed structure.

[0052] In some embodiments, each of the single-layer structures includes a straw layer and a natural adhesive sprayed onto the surface of the straw layer.

[0053] In some preferred embodiments, the thickness of each of the single-layer structures is 10 to 20 cm.

[0054] In some embodiments, each of the layered hybrid structures includes a desert plant layer and a straw layer, the straw layer covering the desert plant layer, the surface of the straw layer being sprayed with a natural adhesive.

[0055] In some preferred embodiments, the thickness of the desert vegetation layer is 30-50 cm, and the thickness of the straw layer is 10-20 cm.

[0056] In some preferred embodiments, the natural adhesive includes at least one of plant gums and starch gums.

[0057] In some preferred embodiments, the amount of the natural adhesive is 0.5~1.0 kg / m³. 2 .

[0058] In some implementations, the straw-laid composite sand barrier includes a composite material layer of 2 to 4 periodic units.

[0059] In some implementations, the thickness of the straw-laid composite sand barrier is 40-80 cm and the width is 2-5 m.

[0060] In some embodiments, the reflective simulated thatch blanket includes a reflective simulated thatch layer and a bottom mesh fabric, with the reflective simulated thatch layer covering the bottom mesh fabric.

[0061] In some implementations, the reflective simulated thatch blanket has a length of 5-50cm and a width of 1-3m.

[0062] In some implementations, the reflective simulated thatch layer comprises multiple rows of parallel spiral reflective thick flat filaments.

[0063] Furthermore, the spiral reflective thick flat filament includes at least one of spiral thick flat filament with built-in reflective masterbatch and spiral thick flat filament with water-based environmentally friendly reflective coating.

[0064] Furthermore, each row of spiral reflective thick flat filaments includes 30-50 spiral reflective thick flat filaments per meter.

[0065] Furthermore, the spacing between adjacent rows of spiral reflective thick flat filaments is 3~10cm.

[0066] In some implementations, the thickness of the reflective simulated thatch layer is 15-30 cm.

[0067] In some implementations, the thickness of the bottom mesh is 0.5 to 1 cm.

[0068] In some embodiments, the bottom mesh fabric comprises a mesh structure woven from fine round or thin flat filaments. This invention allows for the flexible selection of either thin flat filament mesh fabric or fine round filament mesh fabric based on the actual working conditions, such as wind and sand intensity, sand particle size, and terrain conditions of different protected areas.

[0069] Moreover, the thin flat yarn woven into the mesh surface used in this invention has the following advantages: (1) excellent flexibility, which can adapt well to the changes in sandy terrain and has a high degree of fit with the basic barrier; (2) light weight, which makes transportation, laying and recycling convenient and efficient; (3) good air permeability, which is conducive to the germination and growth of sand plant seeds and takes into account the ecological restoration function; (4) the addition of UV-531 ultraviolet absorber and antioxidant 1010 compound system has excellent anti-aging performance and a service life of 10 to 15 years in desert environment.

[0070] Moreover, the mesh surface woven from fine round wire used in this invention has the following advantages: (1) higher tensile strength, strong resistance to wind erosion and tearing; (2) fine mesh, better sand fixation effect; (3) dense structure, good wear resistance, and longer service life under extreme wind and sand conditions; (4) the addition of UV-327 ultraviolet absorber, with excellent resistance to ultraviolet aging.

[0071] In some implementations, the reflective simulated thatch blanket is further provided with multiple fixing holes on its edge, each fixing hole having a diameter of 1 to 2 cm and a spacing of 30 to 50 cm between adjacent fixing holes.

[0072] In this invention, the preparation method of the reflective simulated thatch blanket specifically includes: (1) Substrate pretreatment: Select the above-mentioned reflective thick flat yarn (spiral thick flat yarn with built-in reflective masterbatch or spiral thick flat yarn with water-based environmentally friendly reflective coating), and ensure that all yarns are free from tangling and impurities, and cut to a uniform length of 30~60cm.

[0073] (2) Bottom layer weaving: Fine round yarn is woven into bottom layer mesh by a weaving machine. The width of the mesh is 1~3m, which serves as the supporting base of the thatch blanket and enhances the overall structural stability.

[0074] (3) Implanting of thatch layer: The treated spiral reflective thick flat yarn is sewn onto the bottom mesh at a density of 30-50 yarns / m per row using a sewing machine. The row spacing is 3-10cm to ensure that the flat yarn is firm and does not fall off. During the sewing process, the flat yarn is evenly distributed to form a three-dimensional and fluffy thatch layer with a height of 15-30cm.

[0075] (4) Edge treatment: The edges of the thatch blanket are heat-sealed to prevent loose threads; according to the requirements of the photovoltaic panel installation, fixing holes are pre-set on the edges with a diameter of 1~2cm and a spacing of 30~50cm to facilitate subsequent on-site fixing.

[0076] In some embodiments, the raw materials for preparing the thick flat filament with built-in reflective masterbatch include 40-60% of the main components of retired wind turbine blades, 20-30% of recycled PET material from waste photovoltaic panel backsheets, 5-10% of nano titanium dioxide, 0.3-0.5% of antioxidants and 0.3-0.5 wt% of compatibilizers.

[0077] Specifically, the preparation method of the thick flat filament with built-in reflective masterbatch includes: (1) Raw material pretreatment: Waste wind turbine blades are crushed to a particle size of 2-5 mm, and waste photovoltaic panel backsheet PET layer is crushed to 1-3 mm, and then dried.

[0078] (2) Blending and granulation: All raw materials are fed into a twin-screw extruder in proportion, melt-blended at 180~200℃, and extruded and granulated to obtain silver-white reflective masterbatch.

[0079] (3) Flat filament extrusion molding: The reflective masterbatch and the recycled resin of the wind turbine blade are mixed in a ratio of 1:3, melted by a single screw extruder, and then extruded through a flat die. After stretching and shaping, a spiral flat filament with built-in reflective particles is obtained.

[0080] In some implementations, the particle size of the main component of the decommissioned wind turbine blade is 2-5 mm, and the particle size of the recycled PET material from the waste photovoltaic panel backsheet is 1-3 mm.

[0081] In some embodiments, the raw materials for preparing the water-based environmentally friendly reflective coating include 30-50% water-based acrylic emulsion, 15-25% calcined kaolin, 10-15% mica powder, 5-10% nano titanium dioxide, 0.5-1% toughening agent and 0.5-1% leveling agent.

[0082] In some implementations, the thickness of the water-based environmentally friendly reflective coating is 50~80μm.

[0083] Specifically, the method for preparing the spiral thick flat filament with the water-based environmentally friendly reflective coating includes: (1) Pretreatment: Clean the surface of the reflective simulated thatch blanket to remove dust and oil stains.

[0084] (2) Spraying construction: High-pressure airless spraying equipment is used to spray the coating evenly on the surface of the thatch blanket, and the spraying thickness is controlled at 50~80μm.

[0085] (3) Curing and shaping: Dry naturally at room temperature for 24 hours, or dry in a hot air environment at 60℃ for 2 hours to ensure that the coating is fully formed and the adhesion meets the standard.

[0086] In some embodiments, the diameter of the fine round wire is 0.1~0.5mm.

[0087] In some embodiments, the raw materials for preparing the fine round filaments include 93-95% recycled resin matrix, 1-2% lubricant, and 3-4% third anti-aging agent.

[0088] In some preferred embodiments, the third anti-aging agent includes a UV-327 ultraviolet absorber.

[0089] In some preferred embodiments, the particle size of the resin-glass fiber composite matrix is ​​1~3cm.

[0090] In this invention, the method for preparing the fine round wire specifically includes: 1) Raw material pretreatment: Take the matrix fragments after the decommissioned wind turbine blades are broken, screen the particles with a diameter of 1~3cm, remove impurities, add 3~4% of anti-aging additives (such as UV-327 ultraviolet absorber) and 1~2% of lubricant, put them into a high-speed mixer and mix for 15~20 minutes to ensure that the raw materials are mixed evenly.

[0091] 2) Melting and plasticizing: The mixed raw materials are fed into a single screw extruder, and the temperatures of each section of the extruder are set as follows: feed section 160~180℃, melting section 190~210℃, and die head section 200~215℃, so that the raw materials are fully melted and plasticized to form a uniform melt.

[0092] 3) Spinning: The molten material is extruded through a circular spinneret with a diameter of 0.1~1mm. The extruded filament is then rapidly cooled in a cooling water tank at a temperature of 20~30℃ to ensure stable filament forming.

[0093] 4) Stretching and Shaping: After cooling, the filament enters the stretching machine and undergoes 2-3 stretching processes, with the stretching ratio controlled at 3-5 times, to make the internal structure of the filament dense and the diameter ultimately controlled at 0.1-0.5mm; then it is shaped by heat setting oven at 80-100℃ for 5-10 minutes to eliminate the internal stress of the filament.

[0094] 5) Rewinding for later use: The fine round filaments after being shaped are rewound by a rewinding machine. The rewinding speed is matched with the stretching speed to avoid stretching or loosening of the filaments. The resulting fine round filaments have good toughness, anti-aging properties and wind erosion resistance.

[0095] In some embodiments, the width of the thin flat wire is 0.5~3mm and the thickness is 0.1~0.3mm.

[0096] In some embodiments, the raw materials for preparing the thin flat yarn include 94-96 wt% recycled resin, 1-2 wt% masterbatch, and 2-4 wt% a second anti-aging agent. The second anti-aging agent comprises a compound system of 1-2 wt% ultraviolet absorber UV-531 and 1-2 wt% antioxidant 1010.

[0097] The specific preparation method of the thin flat yarn includes: mixing regenerated resin, masterbatch, and a second anti-aging agent to ensure uniform distribution of the anti-aging components; then melting at 180-200℃ to prevent the decomposition and inactivation of the anti-aging components; extruding the mixture through the gap of the annular die of a blown film machine to form a plastic film; rapidly cooling and shaping the film by blowing air through the cooling pipe of the blown film machine to ensure uniform film thickness and reduce internal stress; the cooled film is fed into a slitting machine and cut into flat yarns of uniform width; then passing the slitting film through a 90° preheating roller to eliminate internal stress, thus obtaining the thin flat yarn. The finished thin flat yarn combines flexibility, wear resistance, and anti-aging properties.

[0098] In some implementations, the third sand barrier has a triangular facet that contacts the sand surface.

[0099] In some implementation schemes, the third sand barrier is laid at a density of 5 to 10 barriers per 10m in the sand-fixing zone. 2 .

[0100] In some embodiments, the cone-shaped sand barrier includes a triangular pyramid sand barrier and / or an anti-tank cone-shaped sand barrier.

[0101] In some preferred embodiments, the triangular pyramidal sand barrier has a triangular pyramidal structure.

[0102] In some preferred embodiments, the anti-tank cone-shaped sand barrier is an anti-tank cone structure.

[0103] In some embodiments, the caltrop-like sand barrier includes a barbed caltrop-like sand barrier.

[0104] In some preferred embodiments, the barbed sand barrier is a multi-faceted barbed sand barrier structure.

[0105] Specifically, the third sand barrier is made of sections of brush-like mesh rope welded or bent and welded, or connected and fixed with binding wire. The whole structure is shaped like a multi-faceted barbed wire, a triangular pyramid, or an anti-tank cone; the multi-faceted structure increases the contact points with the sand surface, improving the ability to intercept flowing sand, while relying on its own weight and triangular stabilizing structure to achieve self-stabilization without the need for additional fixation.

[0106] In some more specific implementations, the preparation and deployment methods of the third sand barrier specifically include the following steps: 1) Segmentation of the net rope: The recycled material brush-shaped net rope is cut into segments of 60~120cm in length. The cut surfaces of the metal wire core skeleton are sealed by heat fusion or welding to prevent the wires from scattering.

[0107] 2) Preparation of barbed wire sand barrier: Bend and fold a single net rope segment into a 90° angled folded segment, ensuring that the fold is firm and does not spring back; take two folded segments and rotate them 90° so that the metal wire skeleton at the top corner is joined together, and use electric arc welding or wire binding to fix the joint point to form a multi-angled barbed wire structure sand barrier.

[0108] 3) Preparation of triangular pyramid-shaped sand barrier: Bend two or four individual rope segments into a triangular outline, so that the metal wire skeletons of each rope segment converge and connect at the apex, and fix the connection point by welding to form a triangular pyramid-shaped sand barrier; ensure that the three sides of the triangular pyramid are uniform in size and have good grounding stability.

[0109] 4) Preparation of anti-tank cone-shaped sand barrier: Similar to the structure of an anti-tank cone, select 3 single net rope segments, mark the middle position of each net rope segment, align the marked positions of the three net rope segments at 90 degrees to each other, and weld the metal wire skeleton together to form a three-column anti-tank cone-shaped sand barrier; after welding, adjust the structure to ensure that all three bottom surfaces can stably touch the ground.

[0110] 5) On-site deployment: The prepared barbed wire, triangular pyramids, and anti-tank cone-shaped sand barriers are randomly scattered on the sand surface at a density of 5-10 per 10 square meters, such as in the area between photovoltaic array panels. No additional fixing is required during deployment; their self-stabilizing characteristic of always having their triangular faces in contact with the ground is utilized. The multi-faceted structure effectively traps shifting sand and stabilizes the sand surface. Because they always have stable triangular faces in contact with the ground, they are allowed to roll with the wind within a certain range.

[0111] In some implementations, the distance between the windbreak and sand-settling belt and the sand-fixing belt is 10-30m, the sand-fixing belt under the slab and the turbulence belt between the slabs are arranged adjacent to each other at intervals, and the widths of the windbreak and sand-settling belt, the sand-fixing belt and the turbulence belt are 100-300m, 4-6m and 8-15m, respectively.

[0112] In some implementation schemes, the distance between the brushed mesh rope sand-blocking wall and the first sand barrier is 5-10m; In some preferred embodiments, when the first sand barrier includes a grape branch composite sand barrier and a straw-laid composite sand barrier, the distance between the brush-shaped net rope sand-blocking wall and the grape branch composite sand barrier is 5-10m, the distance between the grape branch composite sand barrier and the straw-laid composite sand barrier is 5-10m, and the distance between the straw-laid composite sand barrier and the sand-fixing belt is 10-30m.

[0113] In some implementations, the protected object includes a photovoltaic electric field.

[0114] A reflective simulated thatch blanket is installed under the photovoltaic panel and laid on the surface of the sand layer of the sand-fixing strip under the photovoltaic panel. It is fixed by U-shaped nails or ground anchors through fixing holes. This is at least to prevent the column from being eroded, and at the same time, its reflective function is used to improve the power generation efficiency on the back of the photovoltaic panel.

[0115] A second aspect of the present invention provides a method for constructing the photovoltaic electric field sand-fixing system, comprising: The main component of retired wind turbine blades is recycled resin. The main components of the retired wind turbine blades are uniformly mixed with the first anti-aging agent and then melt-extruded to produce thick flat filaments. The main components of the retired wind turbine blades are uniformly mixed with black masterbatch and second anti-aging agent, and then sequentially subjected to melt extrusion, blown film cooling, slitting and drawing to produce thin flat filaments. The main components of the retired wind turbine blades are uniformly mixed with the third anti-aging agent and lubricant, and then melt-plasticized and spun into fine round filaments. Multiple thick, flat filaments are spirally clamped and fixed, wound around a linear metal core skeleton, and formed into a circular brush-like structure to produce a brush-like net rope. Multiple brush-shaped net ropes are arranged in parallel in the vertical direction to form a brush-shaped net rope sand-blocking wall, and multiple brush-shaped net rope sand-blocking walls are set in the wind-blocking and sand-settling belt. The filler material is filled into the three-dimensional skeleton of grape branches to form a three-dimensional support network structure, resulting in a grape branch composite sand barrier; Natural adhesive is sprayed onto the surface of the straw layer and bonded and cured to form a single-layer structure; a straw layer is covered on the desert plant body layer, and the natural adhesive is sprayed onto the surface of the straw layer and bonded and cured to form a layered mixed structure; multiple periodic units of the single-layer structure or the layered mixed structure are stacked to obtain a straw-laid composite sand barrier. The grape branch-type composite sand barrier and / or straw-laying composite sand barrier constitute the first sand barrier, which is laid on the surface of the sand layer in the wind-blocking and sand-settling zone. Spiral reflective thick flat yarns are sewn onto the bottom mesh to make reflective simulated thatch blankets, forming a second sand barrier, which is then laid on the surface of the sand layer in the sand-fixing belt. At least the brush-like netting ropes are bent to create cone-shaped or caltrop-shaped sand barriers; Multiple cone-shaped and / or caltrop-shaped sand barriers are scattered on the surface of the sand layer in the turbulence zone to form a third sand barrier.

[0116] In some embodiments, the method for preparing the brush-shaped mesh rope includes: pre-treating the linear core skeleton; clamping and fixing multiple thick flat wires with a pitch of 10-20cm onto the linear metal core skeleton to form a circular brush-shaped structure; and then winding the brush-shaped mesh rope to fix it into a cylindrical shape. In some implementation schemes, the method for preparing the brushed mesh rope sand-blocking wall specifically includes: installing two sets of vertically erected columns along a direction perpendicular to the prevailing wind direction, the columns being fixed to the ground and spaced apart from each other, and 5 to 10 horizontally arranged brushed mesh ropes being densely arranged in parallel along the vertical direction and fixedly connected to the columns to form a brushed mesh rope sand-blocking wall.

[0117] In some more specific embodiments, the specific preparation steps of the spiral brush-shaped mesh rope are as follows: 1) Skeleton pretreatment: Select galvanized steel wire or stainless steel wire with a diameter of 2~3mm, cut according to the design length of the net rope, remove surface oil and impurities to ensure surface cleanliness and enhance the bonding force with thick flat wire.

[0118] 2) Spiral winding: Fix the treated metal wire core skeleton to one end of the spiral braiding equipment, and install the thick flat wire roll on the wire feeding frame of the braiding machine; start the equipment, the metal wire core skeleton moves forward at a constant speed, and the thick flat wire is spirally wound on the outside of the skeleton according to the set parameters of 10~20cm pitch, forming dense brush-like protrusions.

[0119] 3) Fixing and shaping: During the winding process, the pressing mechanism of the equipment is used to press the wound metal wire core skeleton to ensure that the thick flat wire is tightly attached to the core skeleton and is not easy to loosen; for longer net ropes, a fixing buckle is set every 1 to 2 meters to further enhance the structural stability.

[0120] 4) Finished product inspection: After the winding is completed, the diameter, length, brush-shaped protrusion density and other parameters of the net rope are inspected. After passing the inspection, the net rope is rolled up for use. During the rolling process, avoid excessive bending or squeezing of the net rope to protect the integrity of the brush-shaped protrusion structure.

[0121] The spiral brush-shaped net rope obtained by the above method is spirally fixed to the outside of the metal wire to form a net rope with a dense brush-shaped protrusion structure. The net rope has a diameter of 20~40cm and a length of 5~50m. It can be folded and bent into any shape, which is convenient for transportation and on-site deployment.

[0122] In this invention, the preparation and arrangement method of the brush-like mesh rope sand-blocking wall is as follows: 1) Column processing: Cut steel and round wood profiles according to the design height (1~2m), and process an insertion section with a depth of 40~60cm at the bottom of the column to facilitate insertion and fixation on the sand surface; place the above-mentioned recycled material brush-shaped net rope horizontally between the two columns.

[0123] 2) Site selection: On the sand surface upwind of the protected object, determine the layout direction of the sand-blocking wall according to the wind direction and terrain, ensuring that it is perpendicular to the main wind direction, or deploy multiple parallel walls on the west side (extending north-south) and north side (extending east-west) of the protected object, such as the photovoltaic power plant, to maximize the interception of wind and sand flow.

[0124] 3) Column installation: Insert multiple pairs of columns vertically at intervals of 1.5~3m, with a depth of 40~60cm into the sand surface to ensure that the columns are stable and do not tilt; after insertion, backfill sand around the columns and compact it to enhance stability.

[0125] 4) Installation of netting ropes: Place multiple brush-shaped netting ropes horizontally in parallel and secure them layer by layer between the two columns. Lay them layer by layer from the bottom up until the height of the netting rope stack is consistent with the height of the columns, forming a continuous sand-blocking wall. The adjacent netting ropes should overlap by 5-10cm to avoid gaps that could cause wind and sand to seep in.

[0126] In some implementations, the method for preparing the grape branch composite sand barrier specifically includes: first laying a layer of the filling material on the ground, then inserting the three-dimensional skeleton of the grape branches into the filling material, repeating the laying until the designed thickness of the grape branch composite sand barrier is reached, then spraying the natural adhesive on the surface of the grape branch composite sand barrier, and setting grape branches to be inserted and fixed at the edge of the grape branch composite sand barrier to form an edge reinforcement strip.

[0127] In some more specific embodiments, the preparation method of the grape branch composite sand barrier is as follows: (1) Laying out and positioning: Based on the prevailing wind direction and sand intensity of the photovoltaic plant area, lay out the sand barrier 50-100m outside the plant area to determine the laying range, direction and structural form (trapezoidal / arched / planar) of the sand barrier, and ensure that the sand barrier is perpendicular to the prevailing wind direction to improve the sand blocking efficiency.

[0128] (2) Base treatment: Clean up large gravel and debris in the paving area, level the sand surface, and make the sand slope ≤5° to avoid uneven stress on the sand barrier due to local height difference.

[0129] (3) Interleaving of materials and framework: Step 1: Evenly pile a layer of filler material within the marked area, with a thickness of 20-30cm. No strict leveling is required; keep it in a naturally loose state.

[0130] Step 2: Select robust grape branches with a diameter of 3-8cm and a length of 1-3m, and randomly insert them into the first layer of material. The depth of the branches should be 1 / 2 to 2 / 3 of the thickness of the material, and the spacing between adjacent branches should be 30-50cm. This ensures that the branches intertwine in three-dimensional space to form support nodes and avoid unidirectional arrangement.

[0131] Step 3: Continue to pile up filling material on top of the tree branch framework, with a thickness of 20-30cm, covering the main body of the tree branches, leaving only the ends of the branches embedded in the material to form the next layer of support foundation; repeat the steps of "piling up material ~ inserting grape branches" until the sand barrier reaches the designed thickness (50-100cm).

[0132] (4) Surface reinforcement: After the material is piled on the top layer of the sand barrier, a small number of short grape branches (50-100cm in length) can be inserted to enhance the fixing effect of the surface material; if the wind and sand intensity is high, a small amount of natural adhesive (0.5-1.0 kg / m²) can be sprayed on the top layer, which only acts on the surface material to further prevent it from being blown away by the wind.

[0133] (5) Edge treatment: Thick grape branches (5-8cm in diameter) are used to fix the sand barrier on both sides. The ends of the branches are embedded 15-20cm into the sand surface to form an edge reinforcement zone to prevent the sand barrier from falling off or deforming due to crosswind erosion.

[0134] In some implementation schemes, the method for preparing the straw-laid composite sand barrier specifically includes: first laying a layer of straw on the ground, then spraying a natural adhesive onto the surface of the straw layer to bond and cure it, forming the single-layer structure, repeating the single-layer structure until the designed thickness of the straw-laid composite sand barrier is reached, and fixing the edge of the straw-laid composite sand barrier.

[0135] Alternatively, a layer of desert vegetation can be laid on the ground first, followed by a layer of straw on top of the desert vegetation layer. The natural adhesive can then be sprayed onto the surface of the straw layer and bonded and cured to form a layered mixed structure. The layered mixed structure can be repeated until the designed thickness of the straw-laid composite sand barrier is reached, and the edges of the straw-laid composite sand barrier can be fixed.

[0136] In some more specific embodiments, the preparation method of the straw-laid composite sand barrier is as follows: (1) Base treatment: Clean up large gravel and debris in the area to be laid outside the photovoltaic field, level the sand surface, and ensure that the slope of the sand surface is ≤5° to avoid local water accumulation or steep slope causing the sand barrier to shift.

[0137] (2) First layer laying: spread the raw materials (single material or layered mixture) evenly on the sand surface with a thickness of 10~20cm, ensuring that the materials are loosely distributed and without obvious lumps or gaps.

[0138] (3) Adhesion and curing: Spray natural adhesives (such as plant glue, starch glue, etc.) onto the laid material layer. The amount of spraying should be enough to cover the surface of the upper straw and the junction between straws (recommended amount 0.5~1.0 kg / ㎡) so that the material can bond together to form an integrated protective shell with a certain strength. The wind erosion resistance of the protective shell is ≥15m / s.

[0139] (4) Multi-layer stacking: Repeat the above laying and bonding steps on the solidified protective shell, and stack 2 to 4 layers according to the wind and sand intensity to finally form a straw flat-lay composite sand barrier with a design thickness of 40 to 80 cm. Before laying each layer, the solidification status of the previous layer of protective shell must be checked to ensure that there is no loosening or cracking.

[0140] (5) Edge fixation: The sides of the sand barrier are reinforced with straw bundles or sand burial and compacted, with the edges embedded 5-10cm into the sand surface to prevent lateral wind erosion that could cause the edges to fall off.

[0141] More specifically, this invention addresses the wind and sand control needs of protected objects such as photovoltaic power plants by adopting a "tiered control" strategy. It utilizes a photovoltaic power plant sand control and fixation system to achieve full-process interception and control of wind and sand flows. (1) Outer layer of windbreak and sand-settling zone: 3 to 5 brush-shaped net rope sand-blocking walls are laid out in parallel in the upwind area of ​​the protected object. The distance between the sand-blocking wall and the protected object is determined according to the local wind speed and sand volume, generally 50 to 200 m. By utilizing the height advantage of the sand-blocking wall and the three-dimensional turbulence space structure of the brush-shaped protrusion, the invasion of external wind and sand flow is directly blocked, the wind speed is reduced, and large-diameter flowing sand is deposited on both sides of the sand-blocking wall to form a stable sand accumulation zone, thereby reducing the wind and sand pressure of the subsequent protection zone.

[0142] Straw-laid composite sand barriers or grape branch composite sand barriers (which can be deployed individually or in combination) are set up in the downwind area of ​​each sand-blocking wall. The distance between the composite sand barriers and the sand-blocking wall is 5-10m. The residual wind and sand flow after being intercepted by the sand-blocking wall is intercepted a second time to further deposit fine-grained quicksand, while weakening the wind speed, so as to greatly reduce the sand-carrying capacity of the wind and sand flow and reduce the amount of sand entering the core area of ​​the protected object.

[0143] (2) Sand fixation strip in the middle: A reflective simulated thatch blanket is set under the photovoltaic panel and laid on the sand layer surface of the sand fixation strip under the photovoltaic panel. It is fixed by U-shaped nails or ground anchors through fixing holes to at least prevent the column from being eroded. At the same time, its reflective function is used to improve the power generation efficiency of the back of the photovoltaic panel.

[0144] (3) Turbulence zone: In key areas inside the protected object (such as between rows of photovoltaic arrays, around equipment, on both sides of traffic lines, around oilfield facilities, etc.), one or more of the following can be deployed individually or in combination: barbed wire, triangular pyramid or anti-tank cone sand barriers constructed with brush-shaped net ropes; the deployment density in this area can be adjusted according to the intensity of local wind and sand activity, generally 5 to 10 per 10 square meters, to fix the sand rising on the spot, suppress the undulation of the sand surface in the sand accumulation zone between the panels, and prevent the components and facilities from being buried by quicksand.

[0145] For experiments not specifically described in the examples, the procedures or conditions can be performed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available. Other unmentioned raw materials and instruments are all conventionally chosen and do not involve the core technical means of this invention.

[0146] For example, the black masterbatch used in the embodiments of the present invention is Cabot's PE2762 weather-resistant black masterbatch, with polyethylene as the carrier and a carbon black content of 40%, which can significantly improve the outdoor UV resistance of the product and is suitable for melt extrusion and blown film processes of recycled resin matrix.

[0147] Example 1 like Figure 2 As shown, this embodiment provides a photovoltaic electric field sand control and sand fixation system. The extension direction of the photovoltaic panel array is defined as horizontal. Two adjacent rows of photovoltaic panel arrays are arranged side-by-side along the horizontal direction. Along the prevailing wind direction, the system includes a windbreak and sand-settling zone, a sand-fixing zone, and a turbulence zone, respectively installed in areas affected by wind and sand. These three zones are sequentially arranged along the prevailing wind direction, enabling precise interception of sand and dust flows at different stages of their movement.

[0148] A brush-like mesh rope sand-blocking wall 1, installed within a windbreak and sand-settling zone, is used at least for wind suppression and sand blocking. The brush-like mesh rope sand-blocking wall 1 comprises multiple brush-like mesh ropes 11 arranged in parallel vertical directions. Specifically, the windbreak and sand-settling zone is located at the forefront of the system, directly facing the impact of external wind and sand flows. Through its height advantage and three-dimensional turbulence structure, the brush-like mesh rope sand-blocking wall 1 can significantly reduce wind speed, forcing large-diameter flowing sand to deposit on the outer side of the wall.

[0149] The first sand barrier is laid on the surface of the sand layer in the windbreak and sand-settling zone, and is used at least for the deposition of wind-blown sand. The first sand barrier includes a grape branch composite sand barrier 2 and / or a straw-laid composite sand barrier 3. Specifically, the first sand barrier is located downwind of the brushed net rope sand-blocking wall 1 and is used to deal with the residual wind-blown sand flow after being intercepted by the brushed net rope sand-blocking wall 1.

[0150] The second sand barrier, laid on the surface of the sand layer of the sand-fixing strip under the photovoltaic panel, is at least used to prevent the pillars from being eroded. The second sand barrier includes a reflective spiral simulated thatch blanket 4.

[0151] The third sand barrier 5 is set on the surface of the sand layer in the turbulence zone between the plates, at least to disturb the flow field and thus inhibit the development of sand accumulation between the plates. The third sand barrier 5 includes multiple independently set conical sand barriers and / or caltrop-shaped sand barriers, and the conical or caltrop-shaped sand barriers include bent brush-like net ropes 11. The third sand barrier 5, through its multi-faceted structure and self-stabilizing characteristics, is scattered on the sand surface to disturb the local flow field between the plates and inhibit the formation and development of the sand accumulation zone.

[0152] Through the synergistic effect of the aforementioned three-tiered prevention and control system of "sand blocking and settling - sand fixation - turbulence," the sand-blocking walls surrounding the photovoltaic field can suppress wind speed, creating weak wind conditions for the deposition of shifting sand in the downwind first sand barrier area (grape branch composite sand barrier and / or straw flat-laid composite sand barrier area). Simultaneously, they themselves can block a certain amount of incoming sand. The first sand barrier (grape branch composite sand barrier and / or straw flat-laid composite sand barrier) intercepts and settles most of the external intrusive sand sources. The second sand barrier in the internal under-panel area, a reflective simulated thatch blanket, can fix locally stirred sand, suppress erosion at the base of the pillars, stabilize the sand surface elevation under the panels, and increase power generation. The third sand barrier in the internal inter-panel area, a conical sand barrier and / or caltrop-shaped sand barrier, suppresses wind speed between panels, increases turbulence, and prevents the formation of sand accumulation zones between panels. This forms a comprehensive, all-encompassing protection system, with a protective effect far superior to a single sand barrier.

[0153] like Figure 3 As shown, the height of the brush-like mesh rope sand-blocking wall 1 is 1-2m, and the parallel spacing between two adjacent brush-like mesh rope sand-blocking walls is 10-30m. The brush-like mesh rope sand-blocking wall 1 includes 5-10 spiral brush-like mesh ropes 11 and two uprights 12. The uprights 12 are arranged parallel to each other in the vertical direction, and the spiral brush-like mesh ropes 11 are arranged parallel to each other in the horizontal direction between the two uprights 12, with the spiral brush-like mesh ropes 11 perpendicularly connected to the uprights 12. The two ends of each spiral brush-like mesh rope 11 are fixed to the two uprights 12, and the overlap between adjacent horizontally arranged brush-like mesh ropes 11 is 5-10cm. The spacing between the two uprights 12 is 1.5-3m, the diameter of each upright 12 is 4-12cm, the exposed height is 1-2m, and the insertion depth into the sand surface is 40-60cm. The spiral brush-like mesh ropes 11 have a dense brush-like protrusion structure. The material of the upright 12 includes at least one of steel and round wood. The pitch of the thick flat wires in the spiral brush-shaped mesh rope that are clamped and fixed on the core layer skeleton is 10~20 cm; the spiral brush-shaped mesh rope is also provided with fixing buckles every 1~2m.

[0154] like Figure 4 and Figure 5As shown, the spiral brush-shaped mesh rope 11 includes a linear metal core skeleton 112 and thick flat wires 111. The linear metal core skeleton 112 is formed by two metal wires spirally twisted together axially. The multiple thick flat wires 111 are clamped and fixed between the two spirally twisted metal wires, with both ends extending radially outward from the linear metal core skeleton 112 to form a circular brush-like structure. The diameter of the spiral brush-shaped mesh rope 11 is 20~40cm, and the length is 5~100m.

[0155] In this embodiment, the thick flat filament 111 is spiral-shaped, with a width of 2-10 mm and a thickness of 0.5-2 mm. The raw materials for preparing the thick flat filament 111 include 96 wt% recycled resin and 4 wt% a first anti-aging agent; the first anti-aging agent comprises a compound system of 2 wt% benzotriazole UV absorber and 2 wt% hindered phenolic antioxidant. The particle size of the recycled resin is 1-3 cm. The diameter of the core skeleton 112 is 2-3 mm. The material of the core skeleton 112 includes galvanized steel wire or stainless steel wire.

[0156] like Figure 6 As shown, the reflective spiral simulated thatch blanket 4 includes reflective spiral thick flat yarns 41 and a bottom mesh fabric 42. The reflective spiral simulated thatch blanket 4 has a length of 5~50m and a width of 1~3m.

[0157] like Figure 7 As shown, the grape branch composite sand barrier 2 includes a three-dimensional framework 21 of grape branches and a filling material 22. The filling material 22 includes at least one of straw, sand rice, sand wormwood, tumbleweed, and branches. The shape of the grape branch composite sand barrier 2 includes at least one of trapezoidal, arched, and planar shapes. The thickness of the grape branch composite sand barrier 2 is 50-100cm and the width is 1-5m. The surface layer of the grape branch composite sand barrier also includes a natural adhesive, which is used at least to fix the surface layer.

[0158] like Figure 8 As shown, the straw-laid composite sand barrier 3 includes a straw layer 31 and a filler 22. The surface of the straw layer 31 is sprayed with a natural adhesive, which includes at least one of plant gum and starch gum, and the amount of natural adhesive used is 0.5~1.0 kg / m². 2 The straw-laid composite sand barrier 3 includes a composite material layer of 2 to 4 periodic units. The thickness of the straw-laid composite sand barrier 3 is 40 to 80 cm and the width is 2 to 5 m.

[0159] like Figures 9 to 11As shown, all three types of third sand barriers 5 are formed by cutting spiral brush-shaped net ropes and then fixing them by bending, welding, or wire binding. They include one or more combinations of barbed wire-shaped sand barriers 51, triangular pyramid-shaped sand barriers 52, and anti-tank cone-shaped sand barriers 53. The second sand barrier 3 in this embodiment has a multi-faceted structure, which effectively disturbs near-surface airflow, traps flowing sand, and fixes the sand surface. Furthermore, the second sand barrier of this invention has triangular faces that contact the sand surface. Utilizing the stability principle of triangles, regardless of the landing angle, at least one triangular face always contacts the sand surface, achieving self-stabilization without the need for additional fixing. The third sand barrier is made from spiral brush-shaped net rope 11, and its dense brush-like protrusions further enhance the sand-fixing effect.

[0160] In this embodiment, the third sand barrier 5 is laid at a density of 10 per 10m in the turbulence zone. 2 This density range ensures effective sand fixation while avoiding material waste. Those skilled in the art can make reasonable adjustments within this range based on actual wind and sand environmental parameters.

[0161] This embodiment achieves precise interception of wind and sand flows throughout the entire process by combining deployment according to a graded prevention and control strategy of "sand blocking and settling - sand fixation - disturbance". At the same time, by making high-value use of retired wind turbine blades, it achieves the dual goals of solid waste disposal and wind and sand control, significantly improving the economic and ecological benefits of sand control projects and providing a guarantee for the long-term stable operation of infrastructure in wind and sand active areas.

[0162] In some more specific embodiments, the thick flat filaments, thin flat filaments, and fine round filaments are all made of recycled resin, with the glass fiber component removed. The removal of glass fibers from the wind turbine blades using a solvent extraction method specifically includes the following steps: (1) Crushing pretreatment Waste wind turbine blades are cut, coarsely crushed, and finely crushed into block particles with a diameter of 2-5cm. Impurities such as metal embedded parts and bolts are removed to avoid impurities affecting subsequent resin dissolution and separation.

[0163] (2) Environmentally friendly solvents dissolve and release resin Place the crushed material into a sealed reactor, add an environmentally friendly ester / ketone composite solvent, heat to 60~90℃, and soak for 2~6 hours to allow the epoxy resin to fully swell, dissolve, and completely separate from the glass fiber, thus achieving the initial separation of the resin and glass fiber.

[0164] Specifically, the environmentally friendly ester / ketone composite solvent is composed of environmentally friendly ketone components and environmentally friendly ester components, comprising: 25-45 wt% ketone components and 55-75 wt% ester components. The ketone components include two or more of cyclohexanone, methyl isobutyl ketone (MIBK), and isophorone; the ester components include two or more of propylene glycol methyl ether acetate (PMA), dimethyl carbonate (DMC), ethyl lactate, and dimethyl adipate (DBE).

[0165] As a preferred formulation, based on a 100% mass percentage, it uses 20wt% cyclohexanone, 15wt% isophorone, 35wt% PMA, 20wt% DMC, and 10wt% ethyl lactate. The boiling point range of this compound solvent is 120-185℃. The epoxy swelling efficiency is optimal when soaked at 60-90℃. Subsequent vacuum distillation can achieve a solvent recovery rate of over 92%. The entire process is free of halogenated hydrocarbons and benzene-based toxic solvents, meeting environmental protection requirements.

[0166] (3) Pressure filtration separation of glass fiber The dissolved and mixed slurry is filtered under pressure through a filter screen, and the solid glass fiber residue is completely intercepted and separated to obtain a clear resin mixture solution, thus achieving complete separation of resin and glass fiber and eliminating the presence of residual glass fiber in the resin.

[0167] (4) Solvent recovery and resin purification The resin solution is subjected to vacuum distillation to evaporate and condense the organic solvent for recovery. The solvent can be recycled for use in the resin dissolving process, reducing production costs. The remaining concentrated material is dried and plasticized to obtain high-purity recycled epoxy resin without glass fibers.

[0168] The specific steps for preparing thick flat filaments, thin flat filaments, and fine round filaments are as follows: (1) The preparation method of the thick flat yarn specifically includes: mixing 96% regenerated resin and 4% of the first anti-aging agent (benzotriazole UV absorber UV-326 and hindered phenolic antioxidant 1076 in a 1:1 ratio) in a high-speed mixer for 15 minutes to ensure that the anti-aging agent is uniformly attached to the surface of the regenerated resin. Then, the regenerated resin mixed with the anti-aging agent is fed into an extruder and melt-extruded at 210°C. The extrusion die is used to draw the yarn into a flat yarn with a width of 6 mm and a thickness of 1.5 mm. After cooling and setting, the yarn is wound up to obtain the thick flat yarn. The anti-aging components are uniformly dispersed inside the flat yarn, which can resist strong ultraviolet radiation in the desert for a long time.

[0169] (2) The specific method for preparing the thin flat filament includes: 95% recycled resin, 2% masterbatch, and 3% secondary anti-aging agent are mixed to ensure uniform distribution of the anti-aging components. The mixture is then melted at 180°C to prevent the anti-aging components from decomposing and becoming ineffective. The mixture is then extruded through the annular die of a blown film machine to form a plastic film. The film is then rapidly cooled and shaped by airflow through the cooling pipes of the blown film machine to ensure uniform film thickness and reduce internal stress. The cooled film is then fed into a slitting machine and cut into flat filaments of uniform width. These filaments are then passed through a 90°C preheating roller to eliminate internal stress, resulting in thin flat filaments. The finished thin flat filaments combine flexibility, abrasion resistance, and anti-aging properties, with a width of 1 mm and a thickness of 0.2 mm.

[0170] (3) The specific method for preparing the fine round wire includes: Take 95% recycled resin, 3.5% UV-327 ultraviolet absorber, and 1.5% lubricant, and mix them in a high-speed mixer for 20 minutes to ensure uniform mixing. Feed the mixed material into a single-screw extruder, setting the temperatures of each section as follows: feed section 170℃, melt section 200℃, and die head section 210℃, to fully melt and plasticize the material, forming a uniform melt. Extrude the molten material through a circular spinneret with a 0.5 mm orifice. The extruded filament is rapidly cooled in a cooling water bath at 25℃ to ensure stable filament forming. The cooled filament enters a stretching machine, undergoing two stretching processes with a stretch ratio controlled within 4 times to achieve a dense internal structure and a final diameter of 0.3 mm. It is then heat-set in a 100℃ oven for 5 minutes to eliminate internal stress. After being shaped, the fine round filaments are wound up by a winding machine. The winding speed is matched with the stretching speed to avoid stretching or loosening of the filaments. The resulting fine round filaments have good toughness, anti-aging properties and wind erosion resistance.

[0171] (3) Brush-shaped net rope 11: Thick flat wires are spirally woven with galvanized steel wire of 3mm diameter as the core skeleton, with a pitch of 15cm, to produce a brush-shaped net rope 11 with a diameter of 25cm.

[0172] (4) Preparation of raw materials for reflective simulated thatch blanket 4: Select the above-mentioned thick flat yarn and prepare reflective flat yarn 5 according to the reflective masterbatch embedding process (60% of wind turbine blade recycled epoxy resin, 30% of waste photovoltaic back panel PET recycled material, 9% nano titanium dioxide, 0.5% antioxidant, 0.5% compatibilizer), and cut it to 60cm in length; select fine round yarn to weave the bottom mesh (width 2m, density 12 mesh / inch).

[0173] Preparation of four types of sand-control structures: (1) Brush-shaped mesh rope sand-blocking wall 1: Select steel columns with a height of 1.8m; insert them vertically into the sand surface at a spacing of 2.5m in the upwind direction of the photovoltaic field, with a column spacing of 2.5m and an insertion depth of 50cm, and backfill with sand and compact it; fix the brush-shaped mesh rope layer by layer between the columns to form a continuous sand-blocking wall with a height of 1.3m, with adjacent mesh ropes overlapping by 8cm.

[0174] (2) Grape branch composite sand barrier 2: Select grape branches with a diameter of 3~6cm and a length of 0.8~2.5m, and fill the material with a mixture of corn stalks and Artemisia argyi (mass ratio 2:1); circulate the process of "piling up materials - inserting branches" 3 times to construct an arched structure with a total thickness of 80cm and a width of 150cm; the spacing between the branches is 40cm, and the two sides are fixed horizontally with grape branches with a diameter of 5~6cm, embedded 18cm into the sand surface.

[0175] (3) Straw-laid composite sand barrier 3: The sand barrier is constructed using desert plants such as corn stalks, Artemisia arenaria, tumbleweed, and tree branches as raw materials. A layered, mixed structure is employed, with a 20cm thick desert plant layer and a 10cm thick straw layer on top. Each straw layer is sprayed with a natural adhesive (plant-based glue, starch glue) at a rate of 1.0kg / m². Two layers are stacked using the process of "laying desert plants - laying straw - spraying adhesive" to construct the overall structure, which is 60cm thick and approximately 3m wide. The edges of the sand barrier are embedded 5-10cm into the sand surface and compacted to enhance wind resistance.

[0176] (4) Brush-shaped wire rope barbed sand barrier 51, triangular pyramidal sand barrier 52, and anti-tank cone-shaped sand barrier 53: The brush-shaped wire rope is cut into 100cm long sections, and the cut surfaces are sealed by heat fusion; each section is folded at a 90° angle; two folded sections are rotated 90° to connect the galvanized steel wire skeleton at the apex, and fixed by arc welding. The weld points are coated with anti-rust paint to form a multi-faceted barbed wire structure sand barrier 51. The triangular pyramidal sand barrier 52 and the anti-tank cone-shaped sand barrier 53 are formed and connected in the same way as the barbed wire structure sand barrier 51, only the final shape is different.

[0177] (5) Reflective simulated thatch blanket 4: Reflective spiral thick flat yarns are arranged in parallel at a density of 40 yarns / m per row, with an 8cm spacing between adjacent rows. The middle of the flat yarns is sewn through to the bottom mesh fabric, and the two ends of the flat yarns extend upwards to form a fluffy thatch layer. The edges of the blanket are heat-sealed and pre-drilled with fixing holes (1.5cm in diameter, 40cm between adjacent fixing holes). The reflective spiral simulated thatch blanket 4 includes reflective spiral thick flat yarns 41 and a bottom mesh fabric 42.

[0178] The specific methods for preparing the bottom layer mesh include: The bottom layer mesh is prepared using fine round filaments. (1) Raw material preparation: Select fine round wire (0.3 mm in diameter) obtained by the above method, check the uniformity of wire diameter and surface smoothness, and ensure that there are no defects such as broken ends, burrs, or uneven thickness; prepare the corresponding number of fine round wire bobbins according to the design width of the mesh and the required number of warp wires calculated by warp density.

[0179] (2) Warping process: Install the fine round yarn bobbin on the warping machine bobbin frame, and adjust the number and arrangement of warp yarns according to the designed warp yarn density (12 mesh / inch); start the warping machine and wind the warp yarns onto the warp beam with uniform tension, ensuring that the tension of each warp yarn is consistent (tension controlled at 5~15cN) to avoid uneven tension causing problems such as loose edges and mesh deformation in the mesh fabric.

[0180] (3) Weaving and shaping: Weaving is carried out using a warp knitting machine or a plain loom. The warp beam with wound warp yarns is installed on the loom, and the weft yarns are introduced from the side shed. The warp and weft yarns are interwoven according to the plain weave structure. During the weaving process, the tension of the warp and weft yarns is strictly controlled to ensure that the mesh size is uniform and the shape is regular, and the overall thickness of the mesh is controlled within 1mm. The weaving density can be adjusted in the range of 8~16 mesh / inch according to the application scenario. The higher the density, the better the strength of the mesh, but the air permeability is correspondingly reduced.

[0181] (4) Heat setting treatment: The woven mesh is fed into a heat setting oven under constant tension and continuously heat-treated at 100℃ for 5 minutes to eliminate the internal stress generated during weaving, stabilize the warp and weft dimensions of the mesh, and prevent shrinkage and deformation during subsequent use or sewing. Keep the mesh flat during the setting process and avoid wrinkles.

[0182] (5) Slitting and rolling: According to the design width of 2m of the reflective simulated thatch blanket, the shaped mesh is longitudinally slit to remove the rough edges; then the finished mesh is rolled into rolls in a flat state, each roll is 30m long, packaged and ready for use, and stored in a cool, dry place away from direct sunlight and high temperature environments.

[0183] The bottom layer mesh is prepared using thin flat yarns. (1) Raw material preparation: Select thin flat yarn (1 mm wide and 0.2 mm thick) obtained by the above method, check the uniformity of the width and thickness of the flat yarn, and ensure that there are no defects such as broken ends, burrs, wrinkles, twists, etc.; the flat yarn should be kept flat and should not have obvious curling, so as to ensure that the surface of the mesh fabric is flat after weaving.

[0184] (2) Warping process: Install the thin flat yarn bobbin on the warping machine bobbin frame. When the flat yarn is drawn out, it passes through the guide device to ensure that the flat direction is consistent and that it is not twisted. Adjust the number of warp yarns and the arrangement according to the designed warp yarn density (12 mesh / inch). Wind the warp yarns evenly onto the warp beam and control the tension of each warp yarn to be consistent (tension controlled at 10~20cN) to avoid stretching and deformation of the flat yarn.

[0185] (3) Weaving and shaping: Plain weaving is carried out using a water jet loom or rapier loom. During the weaving process, ensure that the flat yarns are flat and not twisted, and that the warp and weft yarns are tightly attached at the interlacing points, with the mesh openings being regular rectangles or squares. The overall thickness of the mesh is controlled at 1mm. The mesh woven from flat yarns has better light-blocking properties and a smoother surface, making it suitable as a supporting base for thatch layers.

[0186] (4) Hot pressing and shaping: The woven mesh is continuously hot pressed and shaped through two sets of hot pressing rollers. The temperature of the hot rollers is controlled at 100℃ and the linear pressure is 0.3 MPa. Hot pressing makes the interlacing points of the flat yarns more tightly attached, the surface of the mesh is more flat and smooth, and at the same time eliminates the internal stress of weaving, stabilizes the size of the mesh, and prevents shrinkage during subsequent use.

[0187] (5) Slitting and winding: According to the product design width of 2m, the shaped mesh is longitudinally slit and hot-cut to avoid flat filaments, loose threads, and rough edges; then the finished mesh is rolled flat into rolls, each roll is 30m long, packaged and stored away from light for later use.

[0188] Both methods produce bottom layer mesh fabrics with excellent anti-aging and anti-wind erosion properties, making them suitable as support substrates for reflective simulated thatch blankets and meeting the long-term use requirements in harsh environments of photovoltaic fields. In practical applications, one method can be selected based on specific working conditions, or different combinations of warp and weft yarns can be used for weaving.

[0189] Construction of a photovoltaic power plant sand control and fixation system: like Figure 2 As shown, brush-shaped net rope sand-blocking wall 1, grape branch composite sand barrier 2, and straw flat-lay composite sand barrier 3 are laid on the sand layer surface of the sand-blocking and sand-settling zone in the photovoltaic power generation area. Reflective simulated thatch blanket 4 is set in the area below the photovoltaic panels as a sand-fixing zone. The third sand barrier 5 is set between adjacent photovoltaic panel arrays to form a turbulence zone.

[0190] (1) Sand-blocking and sedimentation zone: The above-mentioned brush-shaped net rope sand-blocking wall 1 is set up 100m upwind of the photovoltaic field, perpendicular to the main wind direction, to intercept external wind and sand flow, so that large-diameter flowing sand is deposited outside the wall.

[0191] At a distance of 10m downwind from the brushed rope sand-blocking wall 1, a composite sand barrier 2 made of grape branches and a composite sand barrier 3 made of straw are set up with a spacing of 8m between them to intercept the residual wind and sand flow and deposit fine-grained flowing sand.

[0192] (2) Sand-fixing strip: A reflective simulated thatch blanket 4 is installed under the photovoltaic panel, comprising a reflective simulated thatch layer and a bottom mesh fabric, wherein the reflective simulated thatch layer covers the bottom mesh fabric; the reflective simulated thatch blanket 4 is laid on the surface of the sand layer under the photovoltaic panel and fixed with U-shaped nails through fixing holes, at least to prevent the column from being eroded, and at the same time to improve the power generation efficiency of the back of the photovoltaic panel by utilizing its reflective function. The reflective simulated thatch blanket is 30m long and 2m wide.

[0193] (3) Turbulence strip: Between the rows of photovoltaic arrays, brush-shaped wire rope barbed sand barriers 51, triangular pyramidal sand barriers 52, and anti-tank cone-shaped sand barriers 53 are laid at a spacing of 1.5m, with a laying density of 10 barriers per 10 square meters, to fix the sand on the spot and prevent the photovoltaic modules from being buried by quicksand. In addition, reflective simulated thatch blankets 4 are set under the photovoltaic panels, and are fixed with U-shaped nails through fixing holes with a nail spacing of 40cm to ensure that the thatch blankets are flat and not loose.

[0194] Actual monitoring showed that after five years of operation, the sand-blocking walls and barbed wire sand barriers remained structurally intact, with no obvious aging or damage; the grape branch composite sand barrier was structurally stable with no material spillage; the reflective simulated thatch blanket had no sand accumulation and good reflective performance; the amount of quicksand deposition in the photovoltaic field area was reduced by more than 75% compared to the traditional straw sand barrier protection scheme, the amount of sand accumulation on photovoltaic modules was reduced by 80%, the power generation efficiency on the back of the photovoltaic panels was increased by 12%, and the maintenance frequency was reduced from twice a year to once every two years, significantly reducing operating costs.

[0195] In practical application, after four years of operation in the saline-alkali Gobi environment, the system showed good structural stability with no obvious corrosion or aging; the sand fixation effect was significant, the sand surface in the protected area was flat with no obvious sand accumulation, the maintenance cost was reduced by 60% compared with traditional sand control solutions, and the power generation efficiency on the back of the photovoltaic panels was increased by 10%, providing an effective solution for the protection of photovoltaic fields in saline-alkali Gobi areas.

[0196] In addition, the inventors of this case also conducted experiments with other raw materials, process operations, and process conditions described in this specification, referring to the aforementioned embodiments, and obtained relatively ideal results in all cases.

[0197] Although the invention has been described with reference to illustrative embodiments, those skilled in the art will understand that various other changes, omissions, and / or additions can be made without departing from the spirit and scope of the invention, and that elements of the embodiments can be substituted with substantially equivalents. Furthermore, many modifications can be made without departing from the scope of the invention to adapt particular situations or materials to the teachings of the invention. Therefore, this invention is not intended to be limited to the specific embodiments disclosed for carrying out the invention, but rather is intended to encompass all embodiments falling within the scope of the appended claims. Moreover, unless specifically stated otherwise, any use of the terms first, second, etc., does not indicate any order or importance, but is used to distinguish one element from another.

Claims

1. A photovoltaic power plant sand control and stabilization system based on decommissioned wind turbine blades, characterized in that, include: The brushed mesh rope sand-blocking wall is set within the wind-blocking and sand-settling zone and includes multiple brushed mesh ropes arranged in parallel in the vertical direction. The first sand barrier is laid on the surface of the sand layer in the windbreak and sand-settling zone, and includes grape branch type composite sand barriers and / or straw flat-lay type composite sand barriers. The second sand barrier is laid on the surface of the sand layer of the sand-fixing belt and located below the photovoltaic panels, and includes a reflective simulated thatch blanket. The third sand barrier is set on the surface of the sand layer in the turbulence zone and includes multiple independently set cone-shaped sand barriers and / or caltrop-shaped sand barriers, wherein the cone-shaped sand barriers or caltrop-shaped sand barriers include bent brush-like net ropes. The brush-shaped net rope includes a linear metal core skeleton and thick flat wires. The linear metal core skeleton is formed by multiple metal wires spirally twisted together along the axial direction. The multiple thick flat wires are clamped and fixed between the multiple spirally twisted metal wires, and the two ends of the thick flat wires extend outward radially from the linear metal core skeleton to form a circular brush-shaped structure. The brush-shaped net rope sand-blocking wall and the first sand barrier are arranged in parallel to each other in the upwind direction of the photovoltaic panel. The length direction of the wind-blocking sand-settling belt is parallel to the edge direction of the photovoltaic field area. The turbulence belt is located between adjacent photovoltaic panel arrays. The length directions of the sand-fixing belt and the turbulence belt extend along the array direction of the photovoltaic panels.

2. The photovoltaic electric field sand-fixing system according to claim 1, characterized in that: The brush-shaped mesh rope is a spiral brush-shaped mesh rope; And / or, the brush-like mesh rope has a dense brush-like protrusion structure; And / or, the diameter of the brush-like net rope is 20~40cm and the length is 5~50m; And / or, the thick flat filament is in the form of a helical shape resembling a tension spring; And / or, the pitch of the thick flat wire clamped and fixed on the core layer skeleton is 10~20cm; And / or, the material of the core skeleton includes galvanized steel wire or stainless steel wire; And / or, the diameter of the core skeleton is 2~3mm; And / or, the spiral wire brush-shaped mesh rope is also provided with fixing buckles every 1~2m.

3. The photovoltaic electric field sand-fixing system according to claim 1, characterized in that: The height of the brushed mesh rope sand-blocking wall is 1.0~2.0m, and the parallel spacing between two adjacent brushed mesh rope sand-blocking walls is 10~30m; And / or, the brushed mesh rope sand-blocking wall includes multiple horizontally arranged brushed mesh ropes and multiple vertically arranged columns. The multiple columns are fixed on the ground and spaced apart from each other. The multiple brushed mesh ropes are arranged in parallel and densely in the vertical direction and are fixedly connected to the multiple columns. Preferably, the brushed mesh rope sand-blocking wall includes 5 to 10 horizontally arranged brushed mesh ropes and multiple vertically arranged columns. The multiple columns are fixed on the ground and spaced apart from each other. The multiple brushed mesh ropes are arranged in parallel and densely in the vertical direction and are fixedly connected to the multiple columns. Preferably, the brush-shaped net ropes arranged horizontally overlap by 5-10 cm; Preferably, the distance between the two columns is 1.5~3m; Preferably, the diameter of the column is 4-12cm, the exposed height is 1-2m, and the insertion depth into the sand surface is 40-60cm. Preferably, the material of the column includes at least one of steel and round wood.

4. The photovoltaic electric field sand-fixing system according to claim 1, characterized in that: The grape branch composite sand barrier includes a three-dimensional framework of grape branches and a filler material, wherein the filler material is filled in the three-dimensional framework of grape branches to form a three-dimensional support network structure. Preferably, the three-dimensional framework of the grape branch is formed by multiple naturally curved grape branches intertwined with each other, and the grape branches have a diameter of 2~8cm and a length of 0.5~3m; Preferably, the filler material includes at least one of straw, sand rice, sand wormwood, tumbleweed, and branches; And / or, the shape of the grape branch-type composite sand barrier includes at least one of trapezoidal, arched, and planar shapes; And / or, the thickness of the grape branch composite sand barrier is 50~100cm and the width is 1~5m; And / or, the surface layer of the grape branch composite sand barrier is further interspersed with grape branches to at least enhance the fixation effect of the surface material; And / or, the surface layer of the grape branch composite sand barrier also includes a natural adhesive, which is used at least to fix the surface layer.

5. The photovoltaic electric field sand-fixing system according to claim 1, characterized in that: The straw-laid composite sand barrier includes a composite material layer with multiple periodic units superimposed, and the composite material layer is a single-layer structure or a layered mixed structure. Preferably, each of the single-layer structures includes a straw layer and a natural adhesive sprayed onto the surface of the straw layer; Particularly preferred is that the thickness of each of the single-layer structures is 10-20 cm; Preferably, each of the layered hybrid structures includes a desert plant layer and a straw layer, the straw layer covering the desert plant layer, and the surface of the straw layer being sprayed with a natural adhesive; Preferably, the thickness of the desert vegetation layer is 30-50 cm, and the thickness of the straw layer is 10-20 cm; Particularly preferred is that the natural adhesive includes at least one of plant gums and starch gums; Particularly preferred is that the amount of the natural adhesive used is 0.5~1.0 kg / m³. 2 ; Preferably, the straw-laid composite sand barrier includes a composite material layer of 2 to 4 periodic units; Preferably, the thickness of the straw-laid composite sand barrier is 40-80 cm and the width is 2-5 m.

6. The photovoltaic electric field sand-fixing system according to claim 1, characterized in that: The reflective simulated thatch blanket includes a reflective simulated thatch layer and a bottom mesh fabric, with the reflective simulated thatch layer covering the bottom mesh fabric. And / or, the reflective simulated thatch blanket has a length of 5~50m and a width of 1~3m; Preferably, the reflective simulated thatch layer comprises multiple rows of parallel spiral reflective thick flat filaments; Particularly preferred, the spiral reflective thick flat filament includes at least one of spiral thick flat filament with built-in reflective masterbatch and spiral thick flat filament with water-based environmentally friendly reflective coating; Preferably, each row of spiral reflective thick flat filaments includes 30 to 50 spiral reflective thick flat filaments per meter; Preferably, the spacing between adjacent rows of spiral reflective thick flat filaments is 3~10cm; Preferably, the thickness of the reflective simulated thatch layer is 15~30cm; Preferably, the thickness of the bottom mesh fabric is 0.5~1mm; Preferably, the bottom mesh fabric comprises a mesh structure woven from fine round filaments or thin flat filaments; And / or, the edge of the reflective simulated thatch blanket is also provided with multiple fixing holes, each fixing hole having a diameter of 1~2cm and a spacing of 30~50cm between adjacent fixing holes.

7. The photovoltaic electric field sand-fixing system according to claim 6, characterized in that: The raw materials for preparing the thick flat filament with built-in reflective masterbatch include 40-60% main components of retired wind turbine blades, 20-30% recycled PET material from waste photovoltaic panel backsheets, 5-10% nano titanium dioxide, 0.3-0.5% antioxidant, and 0.3-0.5 wt% compatibilizer. Preferably, the particle size of the main component of the retired wind turbine blade is 2-5 mm, and the particle size of the recycled PET material from the waste photovoltaic panel backsheet is 1-3 mm. And / or, the raw materials for preparing the water-based environmentally friendly reflective coating include 30-50% water-based acrylic emulsion, 15-25% calcined kaolin, 10-15% mica powder, 5-10% nano titanium dioxide, 0.5-1% toughening agent and 0.5-1% leveling agent; And / or, the thickness of the water-based environmentally friendly reflective coating is 50~80μm.

8. The photovoltaic electric field sand-fixing system according to claim 6, characterized in that: The width of the thick flat wire is 2~10mm and the thickness is 0.5~2mm; And / or, the thick flat filament is spiral-shaped; And / or, the raw materials for preparing the thick flat filament include 95-97% recycled resin and 3-5% first anti-aging agent; Preferably, the first anti-aging agent comprises a compound system of 1.5-2.5% benzotriazole ultraviolet absorber and 1.5-2.5% hindered phenolic antioxidant; Preferably, the particle size of the recycled resin matrix is ​​1~3cm; And / or, the width of the thin flat wire is 0.5~3mm and the thickness is 0.1~0.3mm; And / or, the raw materials for preparing the thin flat filaments include 94-96% recycled resin matrix, 1-2% masterbatch, and 2-4% second anti-aging agent; Preferably, the second anti-aging agent is a compound system of 1-2% ultraviolet absorber UV-531 and 1-2% antioxidant 1010; And / or, the diameter of the fine round wire is 0.1~0.5mm; And / or, the raw materials for preparing the fine round filaments include 93-95% recycled resin matrix, 1-2% lubricant and 3-4% third anti-aging agent; Preferably, the third anti-aging agent includes a UV-327 ultraviolet absorber.

9. The photovoltaic electric field sand-fixing system according to claim 1, characterized in that: The third sand barrier has a triangular facet, which is in contact with the sand surface; And / or, the third sand barrier is laid at a density of 5-10 per 10m in the turbulence zone. 2 ; And / or, the cone-shaped sand barrier includes a triangular pyramid-shaped sand barrier and / or an anti-tank cone-shaped sand barrier; Preferably, the triangular pyramidal sand barrier has a triangular pyramidal structure; Preferably, the anti-tank cone-shaped sand barrier is an anti-tank cone structure; And / or, the caltrop-like sand barrier includes iron caltrop-like sand barriers; Preferably, the barbed sand barrier has a multi-faceted barbed sand barrier structure.

10. The photovoltaic electric field sand-fixing system according to claim 1, characterized in that: The distance between the windbreak and sand-settling belt and the sand-fixing belt is 10~30m. The sand-fixing belt under the plate and the turbulence belt between the plates are arranged adjacent to each other at intervals. The widths of the windbreak and sand-settling belt, the sand-fixing belt and the turbulence belt are 100~300m, 4~6m and 8~15m, respectively. And / or, the distance between the brush-like mesh rope sand-blocking wall and the first sand barrier is 5~10m; Preferably, when the first sand barrier includes a grape branch composite sand barrier and a straw-laid composite sand barrier, the distance between the brush-shaped net rope sand-blocking wall and the grape branch composite sand barrier is 5-10m, the distance between the grape branch composite sand barrier and the straw-laid composite sand barrier is 5-10m, and the distance between the straw-laid composite sand barrier and the sand-fixing belt is 10-30m.

11. The method for constructing a photovoltaic power plant sand-fixing and sand-control system based on decommissioned wind turbine blades as described in any one of claims 1-10, characterized in that, include: The main component of retired wind turbine blades is recycled resin. The main components of the retired wind turbine blades are uniformly mixed with the first anti-aging agent and then melt-extruded to produce thick flat filaments. The main components of the retired wind turbine blades are uniformly mixed with black masterbatch and second anti-aging agent, and then sequentially subjected to melt extrusion, blown film cooling, slitting and drawing to produce thin flat filaments. The main components of the retired wind turbine blades are uniformly mixed with the third anti-aging agent and lubricant, and then melt-plasticized and spun into fine round filaments. Multiple thick, flat filaments are spirally clamped and fixed, wound around a linear metal core skeleton, and formed into a circular brush-like structure to produce a brush-like net rope. Multiple brush-shaped net ropes are arranged in parallel in the vertical direction to form a brush-shaped net rope sand-blocking wall, and multiple brush-shaped net rope sand-blocking walls are set in the wind-blocking and sand-settling belt. The filler material is filled into the three-dimensional skeleton of grape branches to form a three-dimensional support network structure, resulting in a grape branch composite sand barrier; Natural adhesives are sprayed onto the surface of the straw layer and bonded and cured to form a single-layer structure. A layer of straw is covered on a layer of desert vegetation, and the natural adhesive is sprayed onto the surface of the straw layer and bonded and cured to form a layered mixed structure; the single-layer structure or the multi-period units of the layered mixed structure are stacked to obtain a straw-laid composite sand barrier. The grape branch-type composite sand barrier and / or straw-laying composite sand barrier constitute the first sand barrier, which is laid on the surface of the sand layer in the wind-blocking and sand-settling zone. Spiral reflective thick flat yarns are sewn onto the bottom mesh to make reflective simulated thatch blankets, forming a second sand barrier, which is then laid on the surface of the sand layer in the sand-fixing belt. At least the brush-like netting ropes are bent to create cone-shaped or caltrop-shaped sand barriers; Multiple cone-shaped and / or caltrop-shaped sand barriers are scattered on the surface of the sand layer in the turbulence zone to form a third sand barrier.

12. The construction method according to claim 11, characterized in that, The preparation method of the brush-shaped mesh rope includes: pre-treating the linear core skeleton; clamping and fixing multiple thick flat wires with a pitch of 10~20cm and winding them around the linear metal core skeleton to form a circular brush-shaped structure; then winding the brush-shaped mesh rope and fixing it into a cylindrical shape. And / or, the preparation method of the grape branch composite sand barrier specifically includes: first laying a layer of the filling material on the ground, then inserting the three-dimensional skeleton of the grape branches into the filling material, repeating the laying until the designed thickness of the grape branch composite sand barrier is reached, then spraying the natural adhesive on the surface of the grape branch composite sand barrier, and additionally inserting grape branches to enhance the fixing effect of the surface material, and setting grape branches to be inserted and fixed at the edge of the grape branch composite sand barrier to form an edge reinforcement strip; And / or, the preparation method of the straw-laid composite sand barrier specifically includes: first laying a layer of straw on the ground, spraying natural adhesive onto the surface of the straw layer to bond and cure it, forming the single-layer structure, repeating the single-layer structure until the designed thickness of the straw-laid composite sand barrier is reached, and fixing the edge of the straw-laid composite sand barrier. Alternatively, a layer of desert vegetation can be laid on the ground first, followed by a layer of straw on top of the desert vegetation layer. The natural adhesive can then be sprayed onto the surface of the straw layer and bonded and cured to form a layered mixed structure. This layered mixed structure can be repeated until the designed thickness of the straw-laid composite sand barrier is reached, and the edges of the straw-laid composite sand barrier can be fixed.

13. The construction method according to claim 11, characterized in that, The method for preparing the main components of the recycled decommissioned wind turbine blades specifically includes: The waste and decommissioned wind turbine blades are crushed and pre-treated. Environmentally friendly solvents are used to dissolve the pretreated wind turbine blade fragments, allowing the recycled resin and glass fiber to be initially separated to obtain a mixed slurry. The mixed slurry is pressurized and filtered to completely separate the glass fibers in the mixed slurry, resulting in a resin mixture. The resin mixture is subjected to vacuum distillation and concentration to obtain regenerated resin.

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