A photovoltaic module cleaner and a method for cleaning photovoltaic modules

Abstract

This disclosure relates to a photovoltaic module cleaner and a method for cleaning photovoltaic modules. The photovoltaic module cleaner comprises gluconate, ethylenediaminetetraacetate, diethylenetriaminepentaacetate, and water. The gluconate content is 0.5-4.0% by weight, the ethylenediaminetetraacetate content is 0.5-4.0% by weight, the diethylenetriaminepentaacetate content is 0.5-4.0% by weight, and the water content is 88.0-98.5% by weight, relative to the total weight of the photovoltaic module cleaner. The cleaner of this disclosure can quickly remove dirt, scale, and mineral deposits from the surface of photovoltaic modules without damaging the surface.

Description

Technical Field

[0001] This disclosure relates to the field of photovoltaic module surface maintenance technology, and more specifically, to a photovoltaic module cleaner and a method for cleaning photovoltaic modules. Background Technology

[0002] Photovoltaic modules are typically used outdoors, and dust easily accumulates on their surfaces. This dust blocks sunlight, reduces power output, and is one of the main factors affecting the performance ratio of photovoltaic power plants. To maintain the cleanliness of the photovoltaic module surfaces, regular cleaning is necessary. Choosing the appropriate cleaning agent based on the specific characteristics of the surface dirt is crucial. Summary of the Invention

[0003] The purpose of this disclosure is to provide a photovoltaic module cleaner and a method for cleaning photovoltaic modules, wherein the cleaner can quickly remove dirt, scale and mineral deposits from the surface of photovoltaic modules without damaging the surface of the photovoltaic modules.

[0004] To achieve the above objectives, the first aspect of this disclosure provides a photovoltaic module cleaner, the photovoltaic module cleaner comprising gluconate, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid and water; Of which, relative to the total weight of the photovoltaic module cleaner, the content of gluconate is 0.5-4.0% by weight, the content of ethylenediaminetetraacetic acid salt is 0.5-4.0% by weight, the content of diethylenetriaminepentaacetic acid salt is 0.5-4.0% by weight, and the content of water is 88.0-98.5% by weight.

[0005] Optionally, relative to the total weight of the photovoltaic module cleaner, the content of the gluconate is 1.5 to 3.5% by weight, the content of the ethylenediaminetetraacetate is 1.5 to 3.5% by weight, the content of the diethylenetriaminepentaacetate is 1.5 to 3.5% by weight, and the content of the water is 89.5 to 95.5% by weight.

[0006] Optionally, the gluconate includes sodium gluconate and / or potassium gluconate, the ethylenediaminetetraacetic acid salt includes dipotassium ethylenediaminetetraacetic acid, and the diethylenetriaminepentaacetic acid salt includes pentapotassium diethylenetriaminepentaacetic acid.

[0007] Optionally, the method for preparing the photovoltaic module cleaner includes: mixing the gluconate, the ethylenediaminetetraacetic acid salt, the diethylenetriaminepentaacetic acid salt, and the water under stirring conditions.

[0008] Optionally, the mixing conditions include: a stirring speed of 300-600 rpm, a time of 5-10 min, and a temperature of 5-35°C.

[0009] The second aspect of this disclosure provides a method for cleaning photovoltaic modules, the method comprising: spraying a photovoltaic module cleaner as described in the first aspect of this disclosure onto the surface of the photovoltaic module, and then allowing it to stand.

[0010] Optionally, the conditions for settling include: a time of 5 to 20 minutes and a temperature of 5 to 35°C.

[0011] Optionally, the spraying includes: using a sprayer to spray the photovoltaic module cleaner onto the surface of the photovoltaic module; The spraying conditions include: spray pressure 0.2~0.4MPa, spray distance 20~40cm, and flow rate 0.2~0.5L / min.

[0012] Optionally, the method further includes rinsing the surface of the photovoltaic module with water after it has been left to stand.

[0013] Optionally, the deposits on the surface of the photovoltaic module include minerals; The minerals include one or more of silicon dioxide, carbonates, sulfates, and aluminosilicates.

[0014] Through the above technical solution, this disclosure utilizes a unique combination of gluconate, ethylenediaminetetraacetic acid (EDTA), and diethylenetriaminepentaacetic acid (DTA) to form a highly efficient photovoltaic module cleaner. The gluconate, EDTA, and DTA have a synergistic effect, dissolving minerals on the surface of the photovoltaic module and simultaneously removing metal ions through chelation. The cleaner's composition is relatively mild, quickly removing dirt, scale, and mineral deposits from the photovoltaic module surface without damaging it. It does not cause corrosion or wear to the photovoltaic module surface, extending its service life. It boasts advantages such as strong environmental friendliness, non-corrosiveness, ease of operation, and significant cleaning effect, making it suitable for large-scale or routine maintenance, thus improving the maintenance efficiency of photovoltaic power plants.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is an XRD pattern of deposits on the surface of an uncleaned photovoltaic module according to Embodiment 1 of this disclosure; Figure 2 This is an FT-IR spectrum of deposits on the uncleaned surface of a photovoltaic module according to Embodiment 1 of this disclosure; Figure 3 This is a photograph of the surface of the photovoltaic module before cleaning, according to Embodiment 1 of this disclosure; Figure 4 This is a photograph of the surface of a cleaned photovoltaic module according to Embodiment 1 of this disclosure; Figure 5 This is a photograph of the cleaned surface of the photovoltaic module, which is Comparative Example 1 of this publication. Detailed Implementation

[0017] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0018] The first aspect of this disclosure provides a photovoltaic module cleaner, the photovoltaic module cleaner comprising gluconate, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid and water; Of which, relative to the total weight of the photovoltaic module cleaner, the content of gluconate is 0.5-4.0% by weight, the content of ethylenediaminetetraacetic acid salt is 0.5-4.0% by weight, the content of diethylenetriaminepentaacetic acid salt is 0.5-4.0% by weight, and the content of water is 88.0-98.5% by weight.

[0019] This disclosure utilizes a unique combination of gluconate, ethylenediaminetetraacetic acid (EDTA), and diethylenetriaminepentaacetic acid (DTA) to form a highly efficient photovoltaic module cleaner. The gluconate, EDTA, and DTA have a synergistic effect, dissolving minerals on the photovoltaic module surface and simultaneously removing metal ions through chelation. The cleaner's composition is relatively mild, quickly removing dirt, scale, and mineral deposits from the photovoltaic module surface without damaging it. It does not cause corrosion or wear to the photovoltaic module surface, extending its lifespan. It boasts advantages such as strong environmental friendliness, non-corrosiveness, ease of operation, and significant cleaning effect, making it suitable for large-scale or routine maintenance.

[0020] According to one embodiment of this disclosure, relative to the total weight of the photovoltaic module cleaner, the content of gluconate is 1.5 to 3.5% by weight, the content of ethylenediaminetetraacetate is 1.5 to 3.5% by weight, the content of diethylenetriaminepentaacetate is 1.5 to 3.5% by weight, and the content of water is 89.5 to 95.5% by weight; for example, relative to the total weight of the photovoltaic module cleaner, the content of gluconate is 2% by weight, the content of ethylenediaminetetraacetate is 3% by weight, the content of diethylenetriaminepentaacetate is 2% by weight, and the content of water is 93% by weight; by limiting each component within the above range, a better cleaning effect is achieved on the surface of the photovoltaic module.

[0021] According to one embodiment of this disclosure, the gluconate comprises sodium gluconate and / or potassium gluconate; the ethylenediaminetetraacetic acid salt comprises dipotassium ethylenediaminetetraacetic acid, and the diethylenetriaminepentaacetic acid salt comprises pentapotassium diethylenetriaminepentaacetic acid; in a preferred embodiment, the photovoltaic module cleaner comprises sodium gluconate, dipotassium ethylenediaminetetraacetic acid, pentapotassium diethylenetriaminepentaacetic acid, and water. The selection of these components improves the cleaning effect while avoiding problems such as damage to the ecosystem caused by detergent dripping during the cleaning process.

[0022] According to one embodiment of this disclosure, a method for preparing the photovoltaic module cleaner includes: mixing the gluconate, the ethylenediaminetetraacetic acid salt, the diethylenetriaminepentaacetic acid salt, and the water under stirring conditions.

[0023] To ensure thorough mixing of the components, according to one embodiment of this disclosure, the mixing conditions include: a stirring speed of 300-600 rpm, including but not limited to 300 rpm, 320 rpm, 350 rpm, 400 rpm, 450 rpm, 500 rpm, 550 rpm, 600 rpm, or any combination thereof; a time of 5-10 min, including but not limited to 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, or any combination thereof; and a temperature of 5-35°C, including but not limited to 5°C, 8°C, 10°C, 15°C, 18°C, 20°C, 25°C, 27°C, 30°C, 32°C, 35°C, or any combination thereof.

[0024] According to one embodiment of the present disclosure, the method includes: mixing gluconate, ethylenediaminetetraacetic acid salt and diethylenetriaminepentaacetic acid salt, and then adding water to the solid mixture.

[0025] The second aspect of this disclosure provides a method for cleaning photovoltaic modules, the method comprising: spraying a photovoltaic module cleaner as described in the first aspect of this disclosure onto the surface of the photovoltaic module, and then allowing it to stand.

[0026] According to one embodiment of this disclosure, the settling conditions include: a time of 5 to 10 minutes, including but not limited to 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, 10 minutes, or any combination thereof; and a temperature of 5 to 35°C, including but not limited to 5°C, 8°C, 10°C, 15°C, 18°C, 20°C, 25°C, 27°C, 30°C, 32°C, 35°C, or any combination thereof. These conditions are beneficial for improving the cleaning effect.

[0027] According to one embodiment of this disclosure, the spraying includes: spraying the photovoltaic module cleaner onto the surface of the photovoltaic module using a sprayer; the spraying conditions include: a spray pressure of 0.2~0.4 MPa, including but not limited to 0.2 MPa, 0.22 MPa, 0.25 MPa, 0.28 MPa, 0.30 MPa, 0.32 MPa, 0.35 MPa, 0.4 MPa, or any combination thereof; a spray distance of 20~40 cm, including but not limited to 20 cm, 22 cm, 25 cm, 28 cm, 30 cm, 32 cm, 35 cm, 40 cm, or any combination thereof; and a flow rate of 0.2~0.5 L / min, including but not limited to 0.2 L / min, 0.25 L / min, 0.3 L / min, 0.32 L / min, 0.35 L / min, 0.40 L / min, 0.45 L / min, 0.5 L / min. L / min, or any combination thereof; the angle is preferably perpendicular to the surface of the photovoltaic module, and the spray should be sufficient to completely wet the surface of the photovoltaic module.

[0028] According to one embodiment of this disclosure, the method further includes rinsing the surface of the photovoltaic module after it has been left to stand with water.

[0029] According to one embodiment of this disclosure, the deposits on the surface of the photovoltaic module include minerals; the minerals include one or more of silica, carbonates, sulfates and aluminosilicates.

[0030] The present disclosure is further illustrated by the following examples, but the present disclosure is not limited thereto. All raw materials used in the examples are commercially available.

[0031] The instrument used for XRD testing was a Bruker D8 X-ray diffractometer. The instrument used for FT-IR testing was a Bruker Tensor II Fourier Transform Infrared Spectrometer.

[0032] Example 1 Photovoltaic module cleaner A1 was prepared and the photovoltaic modules were cleaned using the following steps: (1) Sodium gluconate, dipotassium ethylenediaminetetraacetate and pentapotassium diethylenetriaminepentaacetate were mixed to obtain a mixture. Under stirring conditions, deionized water was added to the obtained solid mixture and stirred to obtain photovoltaic module cleaner A1, which is a transparent and stable solution. The stirring speed was 600 rpm, the time was 5 min, and the temperature was 5℃. Relative to the total weight of photovoltaic module cleaner A1, the content of sodium gluconate is 2% by weight, the content of dipotassium ethylenediaminetetraacetate is 4% by weight, the content of pentapotassium diethylenetriaminepentaacetate is 1% by weight, and the content of deionized water is 93% by weight; (2) Put photovoltaic module cleaner A1 into a sprayer and spray it on the surface of the photovoltaic module that needs to be cleaned. Let it stand at 10°C for 10 minutes. The conditions of the sprayer are: spray pressure 0.2MPa, spray distance 20cm, flow rate 0.2L / min, and angle perpendicular to the surface of the photovoltaic module to completely wet the surface of the photovoltaic module. (3) Rinse the surface of the photovoltaic module with deionized water to remove the cleaning agent from the surface of the photovoltaic module, and let it air dry naturally. The mineral thickness of the photovoltaic module surface before and after cleaning is listed in Table 1.

[0033] XRD and FT-IR spectroscopy tests were performed on the deposits on the uncleaned photovoltaic module surface, and the results are as follows: Figure 1 and 2 As shown. In the FT-IR spectrum, 1614 cm⁻¹ -1 and 3642 cm -1 This is a stretching absorption peak belonging to the OH group in water molecules. It is located at 469 cm⁻¹. -1 The nearby peak is due to Al-O tensile vibration. It is located at 787 cm⁻¹. -1 and 1110 cm -1 The nearby peaks are absorption peaks caused by symmetric and asymmetric tensile vibrations of Si-O-Si. In summary, the results indicate that the deposits on the surface of photovoltaic modules mainly consist of quartz, muscovite, calcite, aluminosilicates, and sulfates.

[0034] Photos of the photovoltaic module surface before cleaning, as shown Figure 3 As shown in the photo, the surface of the cleaned photovoltaic module is as follows: Figure 4 As shown, according to Figure 3 and 4 The comparison shows that the cleaning agent disclosed in this paper has a better cleaning effect on photovoltaic modules.

[0035] Example 2 Photovoltaic module cleaner A2 was prepared and used to clean photovoltaic modules using the method of Example 1. The difference was that, relative to the total weight of photovoltaic module cleaner A2, the content of sodium gluconate was 1 wt%, the content of dipotassium ethylenediaminetetraacetate was 3 wt%, the content of pentapotassium diethylenetriaminepentaacetate was 1 wt%, and the content of deionized water was 95 wt%. The thickness of the deposited layer on the surface of the photovoltaic modules before and after cleaning is listed in Table 1.

[0036] Example 3 Photovoltaic module cleaner A3 was prepared and used to clean photovoltaic modules using the method of Example 1. The difference was that, relative to the total weight of photovoltaic module cleaner A3, the content of sodium gluconate was 1 wt%, the content of dipotassium ethylenediaminetetraacetate was 2 wt%, the content of pentapotassium diethylenetriaminepentaacetate was 4 wt%, and the content of deionized water was 93 wt%. The thickness of the deposited layer on the surface of the photovoltaic modules before and after cleaning is listed in Table 1.

[0037] Comparative Example 1 Photovoltaic module cleaner D1 was prepared and used to clean photovoltaic modules using the method of Example 1, except that diethylenetriaminepentaacetic acid pentapotassium was not added. The content of sodium gluconate was 2% by weight, the content of diethylenetriaminetetraacetic acid dipotassium was 3% by weight, and the content of deionized water was 95% by weight relative to the total weight of photovoltaic module cleaner D1. The thickness of the deposited layer on the surface of the photovoltaic modules before and after cleaning is listed in Table 1.

[0038] Photos of the cleaned photovoltaic module surface, as shown Figure 5 As shown, according to Figure 5 It is known that cleaning agents without the composition disclosed herein have poor cleaning effects on photovoltaic modules.

[0039] Comparative Example 2 Photovoltaic module cleaner D2 was prepared and used to clean photovoltaic modules using the method of Example 1. The difference was that, relative to the total weight of photovoltaic module cleaner D2, the content of sodium gluconate was 0.3 wt%, the content of dipotassium ethylenediaminetetraacetate was 3 wt%, the content of pentapotassium diethylenetriaminepentaacetate was 1 wt%, and the content of deionized water was 95.7 wt%. The thickness of the deposited layer on the surface of the photovoltaic modules before and after cleaning is listed in Table 1.

[0040] Comparative Example 3 Photovoltaic module cleaner D3 was prepared and used to clean photovoltaic modules using the method of Example 1. The difference was that, relative to the total weight of photovoltaic module cleaner D3, the content of sodium gluconate was 3% by weight, the content of dipotassium ethylenediaminetetraacetate was 0.3% by weight, the content of pentapotassium diethylenetriaminepentaacetate was 3% by weight, and the content of deionized water was 93.7% by weight. The thickness of the deposited layer on the surface of the photovoltaic modules before and after cleaning is listed in Table 1.

[0041] Comparative Example 4 Photovoltaic module cleaner D4 was prepared and used to clean photovoltaic modules using the method of Example 1. The difference was that, relative to the total weight of photovoltaic module cleaner D4, the content of sodium gluconate was 2% by weight, the content of dipotassium ethylenediaminetetraacetate was 2% by weight, the content of pentapotassium diethylenetriaminepentaacetate was 0.4% by weight, and the content of deionized water was 95.6% by weight. The thickness of the deposited layer on the surface of the photovoltaic modules before and after cleaning is listed in Table 1.

[0042] The thickness of the deposited layer in the examples and comparative examples was measured using the national standard for measuring the thickness of nanofilms on glass substrates (GB / T 33826-2017) and the stylus profilometer method. During the measurement process, the thickness of the deposited layer was measured in 10 different regions for each sample, and the average value was taken as the surface deposition thickness of that sample. The measurement results are listed in Table 1. Table 1

[0043] Based on the above data, it can be seen that the cleaning agent disclosed herein has a good cleaning effect on the minerals on the surface of photovoltaic modules, and will not cause corrosion or wear to the surface of photovoltaic modules.

[0044] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0045] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0046] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A photovoltaic module cleaner, characterized in that, The photovoltaic module cleaning agent includes gluconate, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and water; Of which, relative to the total weight of the photovoltaic module cleaner, the content of gluconate is 0.5-4.0% by weight, the content of ethylenediaminetetraacetic acid salt is 0.5-4.0% by weight, the content of diethylenetriaminepentaacetic acid salt is 0.5-4.0% by weight, and the content of water is 88.0-98.5% by weight.

2. The photovoltaic module cleaner according to claim 1, wherein, Relative to the total weight of the photovoltaic module cleaner, the content of gluconate is 1.5~3.5% by weight, the content of ethylenediaminetetraacetic acid is 1.5~3.5% by weight, the content of diethylenetriaminepentaacetic acid is 1.5~3.5% by weight, and the content of water is 89.5~95.5% by weight.

3. The photovoltaic module cleaner according to claim 1, wherein, The gluconate includes sodium gluconate and / or potassium gluconate, the ethylenediaminetetraacetic acid salt includes dipotassium ethylenediaminetetraacetic acid, and the diethylenetriaminepentaacetic acid salt includes pentapotassium diethylenetriaminepentaacetic acid.

4. The photovoltaic module cleaner according to claim 1, wherein, The method for preparing the photovoltaic module cleaner includes: mixing the gluconate, the ethylenediaminetetraacetic acid salt, the diethylenetriaminepentaacetic acid salt, and the water under stirring conditions.

5. The photovoltaic module cleaner according to claim 4, wherein, The mixing conditions include: a stirring speed of 300-600 rpm, a time of 5-10 min, and a temperature of 5-35℃.

6. A method for cleaning photovoltaic modules, characterized in that, The method includes: spraying the photovoltaic module cleaner according to any one of claims 1 to 5 onto the surface of the photovoltaic module, and then letting it stand.

7. The method according to claim 6, wherein, The conditions for settling include: time of 5 to 20 minutes and temperature of 5 to 35°C.

8. The method according to claim 6, wherein, The spraying process includes: using a sprayer to spray the photovoltaic module cleaner onto the surface of the photovoltaic module; The spraying conditions include: spray pressure 0.2~0.4MPa, spray distance 20~40cm, and flow rate 0.2~0.5L / min.

9. The method according to claim 6, wherein, The method also includes rinsing the surface of the photovoltaic module with water after it has been left to stand.

10. The method according to claim 6, wherein, The deposits on the surface of the photovoltaic module include minerals; The minerals include one or more of silicon dioxide, carbonates, sulfates, and aluminosilicates.

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