Photovoltaic support wood, preparation method thereof, skid-mounted photovoltaic support comprising photovoltaic support wood and photovoltaic tool

Abstract

The invention provides photovoltaic support wood, a preparation method thereof, a skid-mounted photovoltaic support comprising the photovoltaic support wood and a photovoltaic tool. The preparation method comprises the following steps that wood raw materials are subjected to first soaking in a hydrogen peroxide aqueous solution, and wood A is obtained; the wood A is soaked in a titanium tetrachloride aqueous solution for the second time, boric acid powder is added into the system, and wood B is obtained; the wood B is subjected to third soaking in a mixed solution D containing glacial acetic acid and acetyl chloride, and wood C is obtained; and the wood C is subjected to hot pressing treatment, and the photovoltaic support wood is obtained. A specially treated wood material is used as a frame of the photovoltaic support, so that high-strength design and quick disassembly and transportation of the skid-mounted photovoltaic support can be realized, and the service life of the photovoltaic support in different environments can be prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of auxiliary accessories for photovoltaic panels, and particularly relates to a photovoltaic support wood, a preparation method thereof, a skid-mounted photovoltaic support and a photovoltaic tooling including the same. Background Art

[0002] Solar power generation is a technology that converts solar energy into electrical energy, which can greatly alleviate the future human dependence on fossil fuels and reduce carbon emissions. At the same time, as a renewable energy source, photovoltaic technology helps to solve the global energy shortage problem. In terms of the effect of reducing carbon dioxide, installing a 1-square-meter photovoltaic power generation system is equivalent to planting 100 square meters of trees. Therefore, the current development of renewable energy such as photovoltaic power generation is one of the effective means to fundamentally solve environmental problems such as haze and acid rain.

[0003] Currently, skid-mounted photovoltaics follow the principles of adapting to local conditions, being clean and efficient, having a quick layout, and making nearby use, making full use of local solar energy resources to replace and reduce fossil energy consumption. The current skid-mounted photovoltaics mainly adopt a steel split structure, that is, first fix the photovoltaic support made of metal material on the ground, then install the photovoltaic components through metal threaded connections, and finally adjust the angle, placement position, etc. according to the actual situation.

[0004] However, existing photovoltaic supports are all prepared from alloy materials, with a relatively large mass, and both transportation and installation require the assistance of heavy machinery and cannot be easily completed by manpower alone, increasing transportation costs and construction time. Moreover, the connection between the photovoltaic support and the components is mainly completed by the cooperation of metal bolts and nuts, which is inconvenient for installation and removal. Considering the harsh environments such as heavy rain, sand and dust, and high salinity corrosion that the working conditions may encounter, the service life of metal joints is severely tested, increasing the probability of safety accidents. At the same time, photovoltaic supports and components often adopt a separated form and need to be assembled at the construction site. After use, they are disassembled again, resulting in a long construction period and high costs. At the same time, the repeated disassembly process may cause damage to photovoltaic components and safety accidents. Summary of the Invention

[0005] In order to improve the above problems, according to one aspect of the present invention, a preparation method of a photovoltaic support wood is provided, which includes the following steps:

[0006] Step S1, performing a first soaking on wood raw materials in a boiling hydrogen peroxide aqueous solution with a hydrogen peroxide mass concentration of 30-32% to obtain wood A;

[0007] Step S2: Immerse Wood A in an aqueous titanium tetrachloride solution with a titanium tetrachloride mass concentration of 13 - 20% for the second time, and add 1.5 - 2.5 wt% of boric acid powder (i.e., the weight dosage of boric acid powder accounts for 1.5 - 2.5% of the total weight of the immersion system) to the immersion system during the second immersion to in-situ grow titanium boride on Wood A, obtaining Wood B;

[0008] Step S3: Immerse Wood B in a mixed solution D containing glacial acetic acid and acetyl chloride under the temperature condition of 25 - 38°C and the pressure condition of 0.3×10 5 Pa - 0.5×10 5 Pa for the third time to obtain Wood C;

[0009] Step S4: Perform hot pressing on Wood C to obtain the photovoltaic support wood.

[0010] First, the present invention first uses a boiling aqueous hydrogen peroxide solution with a hydrogen peroxide mass concentration of 30 - 32% to perform the first immersion on the wood raw material to remove part of the lignin in the wood, improve the wood porosity, and provide more reaction channels and contact sites for subsequent step processing.

[0011] Secondly, the present invention then uses an aqueous titanium tetrachloride solution to perform the second immersion on the material, and adds boric acid powder to the system during the second immersion. After removing the lignin, more reactive sites for chemical reactions are exposed on the wood raw material, which can serve as the nucleation centers for growth. When the wood is immersed in the aqueous titanium tetrachloride solution, the aqueous titanium tetrachloride solution will undergo a hydrolysis reaction to generate titanium hydroxy compounds and complexes, which are adsorbed on these reactive sites. The added boric acid powder in the system will react with the titanium hydroxy compounds and complexes to generate titanium boride. Therefore, during this process, titanium boride is generated, deposited, and in-situ grown on the wood while being generated. And during growth, titanium boride will grow on the porous wood in the form with the lowest energy, that is, covering and wrapping, to form a layer of titanium boride film, covering the surface and internal pores of the wood. By controlling the mass concentration of the aqueous titanium tetrachloride solution to be 13 - 20% and the dosage of boric acid powder to account for 1.5 - 2.5% of the total weight of the immersion system, it is ensured that the generated titanium boride is in the nanoscale. Thus, the plastic toughness of the photovoltaic support can be improved, and further the photovoltaic support can meet the mechanical plastic toughness performance requirements such as earthquake resistance and hail resistance during use.

[0012] Furthermore, the present invention continues to immerse the material in a mixed solution D containing glacial acetic acid and acetyl chloride under the temperature condition of 25 - 38°C and the pressure condition of 0.3 - 0.5×10 5 Pa for the third time. Glacial acetic acid and acetyl chloride undergo a hydroxyesterification reaction with the cell wall of the wood, thereby further improving the strength, wind resistance, anti-microbial property, and corrosion resistance of the photovoltaic support.

[0013] Finally, the present invention compresses the cell walls in wood through hot pressing treatment, so as to improve the densification degree of wood and eliminate the structural defects of wood while maintaining the original ordered arrangement of nanocellulose and hydroxy-esterified cell walls in wood, thereby further improving the strength of the photovoltaic support. Furthermore, the photovoltaic support has more excellent tensile strength on the basis of lighter weight and better stability, thus having significant advantages in aspects such as hoisting, transportation, installation, and disassembly.

[0014] Moreover, the photovoltaic support obtained through the above treatment is light grayish-white and has a high reflectivity. During subsequent applications, it can reflect sunlight onto the photovoltaic module for secondary absorption, increasing the secondary absorption of light by the photovoltaic module.

[0015] It should also be noted here that the present invention has a limitation on the order of the above steps, and any swapping of the steps cannot achieve the above beneficial effects. For example, if the second immersion is carried out first and then the first immersion, titanium boride will only grow on the surface of the wood, unable to improve the properties of the wood bulk phase, resulting in anisotropy of the material properties. Another example is that if the hot pressing treatment is carried out first and then the third immersion, the original structure of the wood will collapse, and the pressure and heating will destroy the interaction between cellulose and cell walls, causing adhesion between lignin and cellulose, greatly reducing the porosity, and being unfavorable for the improvement of wood properties by subsequent treatments. Another example is that if the third immersion treatment is carried out first and then the second immersion treatment, the cell walls will be esterified, reducing the surface reaction activity, which is unfavorable for the in-situ growth of nano-titanium boride in the second step.

[0016] In addition, such a photovoltaic support made of wood can be subsequently connected to the photovoltaic module in a mortise and tenon manner, without metal threads, and the installation and disassembly are fast and simple, with a high safety factor. When the photovoltaic module is embedded in the support and transported and relocated, only the mortise and tenon buckle needs to be opened, and the photovoltaic module is placed in the support, saving the complicated installation and disassembly process and greatly improving the construction efficiency of the skid-mounted photovoltaic equipment.

[0017] It is supplemented that the above wood raw materials can use conventional commercially available woods, such as square timbers, round timbers, cylindrical timbers, etc. Before preparing the photovoltaic support made of wood, the wood is cut into the shape of the required photovoltaic support along the natural growth direction of the wood for the above treatment to obtain the photovoltaic support made of wood. The above can be achieved by those skilled in the art themselves and will not be elaborated here.

[0018] In the above first immersion, the immersion time and solution concentration can be adaptively adjusted according to the size of the wood. In a preferred embodiment, in order to further balance the strength performance and weight performance of the photovoltaic support, the immersion time of the first immersion is 24 - 48 h.

[0019] In order to further improve the plasticity and toughness of the photovoltaic support, the immersion time of the second immersion is preferably 15 - 22 h.

[0020] Considering further enhancing the strength and wind resistance performance of the photovoltaic support, it is preferred that the time for the third immersion is 3 to 10 h; in the mixed solution D, the volume ratio of glacial acetic acid to acetyl chloride is 1:3 to 4.2.

[0021] In order to further improve the densification degree of the photovoltaic support and eliminate structural defects, it is preferred that the temperature for the hot pressing treatment is 90 to 110 °C, the pressure is 3 to 8 MPa, and the time is 20 to 29 h.

[0022] In a preferred embodiment, between step S1 and step S2, between step S2 and step S3, and between step S3 and step S4, the preparation method further includes a step of washing the material. For example, after the first immersion, the material is taken out and washed 3 to 5 times with deionized water and ethanol respectively; after the second immersion, the material is taken out and washed 3 to 8 times with deionized water and ethanol respectively; after the third immersion, the material is taken out and washed 3 to 8 times with deionized water and ethanol respectively.

[0023] According to another aspect of the present invention, there is provided a photovoltaic support wood prepared by the preparation method of the foregoing photovoltaic support wood.

[0024] Based on the foregoing reasons, the photovoltaic support wood of the present invention is lighter in mass, better in stability, and better in plastic toughness on the basis that its tensile strength meets the requirements of photovoltaic applications. It also has good corrosion resistance, anti-microbial property, and wind resistance. Moreover, the photovoltaic support wood is light grayish-white with a high reflectivity, and can reflect sunlight onto the photovoltaic module for secondary absorption. At the same time, such a photovoltaic support wood can be subsequently connected to the photovoltaic module in a mortise and tenon manner without metal threads, and the installation and disassembly are quick and simple with a high safety factor; when the photovoltaic module is embedded in the support and transported and relocated, only the mortise and tenon buckle needs to be opened, and the photovoltaic module is placed in the support, saving the complicated installation and disassembly process.

[0025] According to another aspect of the present invention, there is provided a skid-mounted photovoltaic support, as Figure 1 shown, which includes a bottom plate frame 1, a component frame 2, a main beam 3, and an inclined support rod 4; the component frame 2 is fixed on the main beam 3; the main beam 3 is connected to the bottom plate frame 1 through the inclined support rod 4; a first fixing seat is fixed on one side of the inner wall of the bottom plate frame 1, and one side of the component frame 2 is connected to the bottom plate frame 1 through the first fixing seat; a second fixing seat is fixed on the other side of the inner wall of the bottom plate frame 1, and the support rod 4 is connected to the bottom plate frame 1 through the second fixing seat; the materials of the bottom plate frame 1, the component frame 2, the main beam 3, and the inclined support rod 4 are independently the foregoing photovoltaic support wood; the connection between the main beam 3 and the inclined support rod 4 is a running horse pin connection, the connection between the inclined support rod 4 and the bottom plate frame 1 is a round pin mortise connection, and the connection between the component frame 2 and the bottom plate frame 1 is a round pin mortise connection.

[0026] The photovoltaic support is assembled using a mortise and tenon structure, eliminating the metal threaded structure, reducing the weight of the photovoltaic support, improving corrosion resistance, and further reducing the cost and cycle of assembling, disassembling, and transporting the photovoltaic support.

[0027] Furthermore, between the four corners of the component frame 2 is a box-type plug splicing.

[0028] According to another aspect of the present invention, a photovoltaic tooling is provided, as Figure 1 shown, including the aforementioned skid-mounted photovoltaic support and the photovoltaic component 5. There is a double patch joint between the photovoltaic component 5 and the component frame 2 in the skid-mounted photovoltaic support.

[0029] The present invention integrates the photovoltaic component and the support into an integrated structure, which can not only achieve the high-strength design and rapid disassembly and transportation of the skid-mounted photovoltaic support, but also improve the lifespan of the photovoltaic support in different environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Shows a schematic structural diagram of the photovoltaic tooling in an embodiment of the present invention;

[0031] Figure 2 Shows the tensile strength test diagrams of the materials in Example 1 and Comparative Example 1 of the present invention.

[0032] Wherein: 1, bottom plate frame; 2, component frame; 3, main beam; 4, inclined support rod; 5, photovoltaic component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In order to have a clearer understanding of the technical features, objectives, and beneficial effects of the present invention, the technical solutions of the present invention are described in detail below, but it should not be construed as a limitation on the implementable scope of the present invention.

[0034] Example 1

[0035] Step S1, soak the wood raw material in a hydrogen peroxide aqueous solution with a mass concentration of 30% and boiling for 28 h for the first soak. After the first soak, take out the material and wash it 3 times with deionized water and ethanol respectively to obtain wood A;

[0036] Step S2, soak wood A in an aqueous titanium tetrachloride solution with a mass concentration of 16% for 18 h for the second soak, and add 2.2 wt% of boric acid powder to the soak system during the second soak to in-situ grow nano-titanium boride on wood A. After the second soak, take out the material and wash it 5 times with deionized water and ethanol respectively to obtain wood B;

[0037] Step S3, place wood B at a temperature of 30 °C and a pressure of 0.4×10 5The third immersion is carried out in the mixed solution D containing glacial acetic acid and acetyl chloride in Pa (the volume ratio of glacial acetic acid to acetyl chloride is 1:3.5). After 5 hours of the third immersion, the material is taken out and washed 5 times with deionized water and ethanol respectively to obtain wood C;

[0038] Step S4, hot-press the wood C to obtain the photovoltaic bracket wood. The temperature of the hot-pressing treatment is 95 °C, the pressure is 3 MPa, and the time is 24 h.

[0039] Example 2

[0040] The difference from Example 1 is only that:

[0041] The time of the first immersion is 33 h; the mass concentration of hydrogen peroxide in the hydrogen peroxide aqueous solution is 31%.

[0042] The time of the second immersion is 15 h; the mass concentration of titanium tetrachloride is 13%, and the dosage of boric acid powder accounts for 2.5 wt% of the total weight of the immersion system.

[0043] The time of the third immersion is 6 h; in the mixed solution D, the volume ratio of glacial acetic acid to acetyl chloride is 1:3.

[0044] The temperature of the hot-pressing treatment is 110 °C, the pressure is 6 MPa, and the time is 26 h.

[0045] After the first immersion, the material is taken out and washed 5 times with deionized water and ethanol respectively.

[0046] Example 3

[0047] The difference from Example 1 is only that:

[0048] The time of the first immersion is 24 h; the mass concentration of hydrogen peroxide in the hydrogen peroxide aqueous solution is 32%.

[0049] The time of the second immersion is 20 h; the mass concentration of titanium tetrachloride is 20%, and the dosage of boric acid powder accounts for 1.5% of the total weight of the immersion system.

[0050] The time of the third immersion is 3 h; in the mixed solution D, the volume ratio of glacial acetic acid to acetyl chloride is 1:3.2.

[0051] The temperature of the hot-pressing treatment is 100 °C, the pressure is 7 MPa, and the time is 27 h.

[0052] After the first immersion, the material is taken out and washed 4 times with deionized water and ethanol respectively; after the second immersion, the material is taken out and washed 6 times with deionized water and ethanol respectively.

[0053] Comparative Example 1

[0054] Hot-dip galvanized Q235A carbon steel.

[0055] The tensile strength of the materials in Example 1 and Comparative Example 1 was tested in accordance with the national standard "Carbon Structural Steel" (GB / T 700-2007) and the industry standard "General Technical Requirements for Solar Photovoltaic System Supports" (JG / T 490-2016). The test results are as Figure 2 shown, and the tensile strength of the material in Example 1 is superior to that in Comparative Example 1.

[0056] Comparative Example 2

[0057] The difference from Example 1 is only that:

[0058] The time of the first immersion is 20 h; the mass concentration of hydrogen peroxide in the hydrogen peroxide aqueous solution is 10%.

[0059] The time of the second immersion is 20 h; the mass concentration of titanium tetrachloride is 10%, and the dosage of boric acid powder accounts for 1.8% of the total weight of the immersion system.

[0060] The time of the third immersion is 4 h; in the mixed solution D, the volume ratio of glacial acetic acid to acetyl chloride is 1:3.5.

[0061] The temperature of the hot pressing treatment is 100 °C, the pressure is 8 MPa, and the time is 22 h.

[0062] After the first immersion, the material is taken out and washed 5 times with deionized water and ethanol respectively.

[0063] Comparative Example 3

[0064] The difference from Example 1 is only that:

[0065] The time of the first immersion is 10 h; the mass concentration of hydrogen peroxide in the hydrogen peroxide aqueous solution is 5%.

[0066] The time of the second immersion is 20 h; the mass concentration of titanium tetrachloride is 10%, and the dosage of acid powder accounts for 3% of the total weight of the immersion system.

[0067] The time of the third immersion is 3 h; in the mixed solution D, the volume ratio of glacial acetic acid to acetyl chloride is 1:2.3.

[0068] The temperature of the hot pressing treatment is 60 °C, the pressure is 12 MPa, and the time is 5 h.

[0069] After the first immersion, the material is taken out and washed 4 times with deionized water and ethanol respectively; after the second immersion, the material is taken out and washed 4 times with deionized water and ethanol respectively; after the third immersion, the material is taken out and washed 3 times with deionized water and ethanol respectively.

[0070] Performance characterization:

[0071] The performance of the examples and comparative examples was tested in accordance with the General Technical Requirements for Solar Photovoltaic System Supports (JG / T 490-2016), the Technical Requirements for Supports of Photovoltaic Power Stations (NB / T 10642-2021), etc. The test results are shown in Table 1.

[0072] Table 1

[0073]

[0074] It can be seen from the content recorded in Table 1 that the materials obtained in Examples 1-3 of the present invention can bring good mechanical properties, corrosion resistance and wind resistance.

Claims

1. A preparation method of a photovoltaic support wood, characterized in that, It includes the following steps: Step S1: The wood raw material is first soaked in a boiling hydrogen peroxide aqueous solution with a hydrogen peroxide mass concentration of 30 - 32% to obtain Wood A. Step S2: The Wood A is secondarily soaked in an aqueous titanium tetrachloride solution with a titanium tetrachloride mass concentration of 13 - 20%, and 1.5 - 2.5 wt% of boric acid powder is added to the soaking system during the second soaking process to in-situ grow titanium boride nanoparticles on the Wood A, obtaining Wood B. Step S3, immerse the wood B in a mixed solution D containing glacial acetic acid and acetyl chloride under the temperature condition of 25-38°C and the pressure condition of 0.3×10 5 Pa to 0.5×10 5 Pa for the third time to obtain wood C; Step S4: The Wood C is subjected to hot pressing to obtain the photovoltaic support wood.

2. The preparation method of the photovoltaic support wood according to claim 1, wherein The time of the first soaking is 24 - 48 h.

3. The preparation method of the photovoltaic support wood according to claim 1, characterized in that, The time of the second soaking is 15 - 22 h.

4. The preparation method of the photovoltaic support wood according to claim 1, characterized in that, The time of the third soaking is 3 - 10 h. Preferably, in the mixed liquid D, the volume ratio of glacial acetic acid to acetyl chloride is 1:3 - 4.

2.

5. The preparation method of the photovoltaic support wood according to claim 1, characterized in that, The temperature of the hot pressing is 90 - 110 °C, the pressure is 3 - 8 MPa, and the time is 20 - 29 h.

6. The preparation method of the photovoltaic support wood according to claim 1, characterized in that, Between Step S1 and Step S2, between Step S2 and Step S3, and between Step S3 and Step S4, the preparation method further includes a step of washing the material.

7. A photovoltaic support wood, characterized in that, Prepared by the preparation method of the photovoltaic support wood according to any one of claims 1 to 6.

8. A skid-mounted photovoltaic support, comprising a bottom plate frame (1), a component frame (2), a main beam (3) and an inclined support rod (4); the component frame (2) is fixed on the main beam (3); the main beam (3) is connected to the bottom plate frame (1) through the inclined support rod (4); on one side of the inner wall of the bottom plate frame (1), a first fixing seat is fixed, and one side of the component frame (2) is connected to the bottom plate frame (1) through the first fixing seat; on the other side of the inner wall of the bottom plate frame (1), a second fixing seat is fixed, and the support rod (4) is connected to the bottom plate frame (1) through the second fixing seat; characterized in that the materials of the bottom plate frame (1), the component frame (2), the main beam (3) and the inclined support rod (4) are each independently the photovoltaic support wood according to claim 7; a running horse pin connection is provided between the main beam (3) and the inclined support rod (4), a round pin mortise connection is provided between the inclined support rod (4) and the bottom plate frame (1), and a round pin mortise connection is provided between the component frame (2) and the bottom plate frame (1).

9. The skid-mounted photovoltaic support according to claim 8, characterized in that, A box-shaped fire plug splicing is provided between the four corners of the component frame (2).

10. A photovoltaic tooling, characterized in that, It includes the skid-mounted photovoltaic support according to claim 8 or 9 and a photovoltaic module (5), and a double patch joint is provided between the photovoltaic module (5) and the component frame (2) in the skid-mounted photovoltaic support.

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