Gypsum accumulated dust cleaning agent for photovoltaic module and use method of gypsum accumulated dust cleaning agent

Abstract

The invention discloses a photovoltaic module gypsum accumulated dust cleaning agent and a use method thereof. The cleaning agent is composed of 10-40% by mass of a complexing agent, 5-10% by mass of a cleaning auxiliary agent, 0.5-2% by mass of a penetrant and demineralized water. And the complexing agent is used for complexing calcium ions in gypsum. The cleaning aid is used for increasing the reaction rate and promoting dissolution of gypsum. And the penetrating agent can accelerate the complexing agent and the cleaning auxiliary agent to penetrate into the gypsum and the gypsum-glass bonding surface, so that the dissolution reaction is accelerated. The cleaning agent can quickly dissolve gypsum, does not need to be soaked or washed for a long time, is easy to biodegrade, is easy to treat waste liquid, and is environment-friendly.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical cleaning, and in particular relates to a photovoltaic module gypsum dust cleaning agent and a use method thereof. Background Art

[0002] In order to achieve green and low-carbon transformation and development and promote the integrated multi-energy complementary construction of wind, solar, thermal and storage, a large number of photovoltaic panels are often installed inside and around thermal power plants.

[0003] Most thermal power plants use wet flue gas desulfurization technology, especially the limestone-gypsum process. Since the clean flue gas at the outlet of the wet flue gas desulfurization absorption tower is in a wet saturated state, the temperature decreases during the process of flowing through the flue and chimney into the atmosphere, and some of the vapor water and slurry in the flue gas will condense and fall in the surrounding area of ​​the thermal power plant, forming "gypsum rain". After the "gypsum rain" falls on the photovoltaic panel, it dries to white gypsum spots. Gypsum is difficult to dissolve in water and is tightly bonded to the glass cover of the photovoltaic panel. Long-term deposition of gypsum on the surface of the photovoltaic panel is prone to produce hot spots, affecting the life of the component and the power generation efficiency.

[0004] At present, there are two methods for cleaning gypsum dust from photovoltaic modules: physical method and chemical method, which mainly have the following problems: 1) Physical methods mostly use manual scrubbing, water flushing and other methods. Since gypsum is tightly bonded to the glass cover and is difficult to dissolve in water, conventional water flushing methods have problems such as poor flushing effect and large amount of flushing water. Manual scrubbing has problems such as component surface wear, low efficiency and poor effect.

[0005] 2) Chemical methods often use surfactants and chelating agents for cleaning. Commonly used chelating agents include ethylenediaminetetraacetic acid (EDTA), sodium nitrilotriacetate (NTA), triethanolamine, citric acid, ethylenediaminetetramethylene phosphate (EDTMPS), etc. Commonly used chelating agents have weak solubility for gypsum, and long-term soaking and rinsing are required to partially dissolve the gypsum. Long-term soaking and rinsing can easily cause corrosion of the aluminum alloy frame and galvanized bracket of photovoltaic modules, and produce a large amount of difficult-to-biodegrade cleaning waste liquid, causing environmental pollution. Summary of the invention

[0006] The object of the present invention is to provide a photovoltaic module gypsum dust cleaning agent and a use method, the cleaning agent can quickly dissolve gypsum without soaking or long-term rinsing, and the cleaning agent is easily biodegradable and environmentally friendly.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: In a first aspect, the present invention provides a photovoltaic module gypsum dust cleaning agent, which is composed of 10% to 40% by mass of a complexing agent, 5% to 10% by mass of a cleaning aid, 0.5% to 2% by mass of a penetrant and desalted water.

[0008] The complexing agent is used to complex the calcium ions in the gypsum, and is a mixture of one or more of tetrasodium glutamate diacetate, tetrasodium aspartate diacetate, and trisodium dicarboxymethyl alanine; the cleaning aid is used to increase the reaction rate and promote the dissolution of the gypsum, and is a mixture of one or more of ammonium citrate, ammonium carbonate, and sodium carbonate. The penetrant can accelerate the penetration of the complexing agent and the cleaning aid into the gypsum and the gypsum-glass interface, and accelerate the dissolution reaction, and is a mixture of one or more of sodium cocoyl glycinate, sodium lauroyl sarcosinate, and sodium cycloglutamate.

[0009] In a second aspect, the present invention provides a photovoltaic module gypsum dust cleaning agent, which has an operating temperature of 5°C to 95°C and a method of use of: 1) Use sulfuric acid to adjust the pH value of the cleaning solution to 7.0; 2) Spray the cleaning solution with adjusted pH value to the gypsum deposition position of the photovoltaic module; 3) After the gypsum is moistened and bubbles begin to form, rinse it with water without added detergent to dissolve the gypsum or flush it out of the photovoltaic panel.

[0010] 4) After the plaster is rinsed clean, continue rinsing until the rinse water is clear and free of foam.

[0011] As a further improvement of the present invention, sulfuric acid is used to adjust the pH value of the cleaning solution to 7±05.

[0012] As a further improvement of the present invention, when the cleaning liquid with adjusted pH value is sprayed onto the gypsum deposition position of the photovoltaic module, the spraying amount per unit area is 0.1~0.5L / m².

[0013] As a further improvement of the present invention, the cleaning liquid with adjusted pH value is sprayed to the gypsum deposition position of the photovoltaic module, and the waiting reaction time is 5 to 20 minutes.

[0014] As a further improvement of the present invention, when flushing is performed using water without adding detergent, the flushing water pressure is 10~200kPa.

[0015] The technical solution provided by the present invention has the following beneficial effects: The cleaning agent dissolves gypsum quickly without soaking or long-term rinsing; the cleaning agent is neutral and has a short reaction time, and is non-corrosive to easily corrosive parts such as aluminum alloy frames and galvanized brackets; the cleaning agent is easily biodegradable and environmentally friendly. DETAILED DESCRIPTION

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

[0017] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0018] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any mixture of these items, including any mixture of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0019] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0020] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0021] The weight of the relevant components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also indicate the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the embodiment description of the present application, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass in the embodiment description of the present application can be a mass unit known in the chemical industry such as µg, mg, g, kg, etc.

[0022] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0023] The first object of the present invention is to provide a photovoltaic module gypsum dust cleaning agent, comprising 10% to 40% by mass of a complexing agent, 5% to 10% by mass of a cleaning aid, 0.5% to 2% by mass of a penetrant and 48% to 84.5% by mass of desalted water.

[0024] The complexing agent is used to complex the calcium ions in the gypsum, and is a mixture of one or more of tetrasodium glutamate diacetate, tetrasodium aspartate diacetate, and trisodium dicarboxymethyl alanine; the cleaning aid is used to increase the reaction rate and promote the dissolution of the gypsum, and is a mixture of one or more of ammonium citrate, ammonium carbonate, and sodium carbonate. The penetrant can accelerate the penetration of the complexing agent and the cleaning aid into the gypsum and the gypsum-glass interface, and accelerate the dissolution reaction, and is a mixture of one or more of sodium cocoyl glycinate, sodium lauroyl sarcosinate, and sodium cycloglutamate.

[0025] The principle analysis of each component is as follows: Complexing agent (mass percentage 10%~40%), can complex calcium ions in gypsum, and help dissolve and remove gypsum. One or more of tetrasodium glutamate diacetate, tetrasodium aspartate diacetate, and trisodium dicarboxymethyl alanine are mixed at random. These ingredients are effective calcium ion complexing agents, which can selectively combine with calcium ions to form stable complexes, thereby promoting the dissolution of gypsum.

[0026] Cleaning aid (5% to 10% by mass) can increase the reaction rate and promote the dissolution of gypsum. One or more of ammonium citrate, ammonium carbonate, and sodium carbonate can be mixed at will. These ingredients can accelerate the reaction between the cleaning agent and gypsum and improve the dissolution efficiency.

[0027] Penetrant (mass percentage 0.5%~2%), accelerates the penetration of complexing agent and cleaning aid into the interior of gypsum and the gypsum-glass interface, and accelerates the dissolution reaction. Sodium cocoyl glycinate, sodium lauroyl sarcosinate, sodium cycloglutamate or one or more can be mixed arbitrarily. These ingredients have good permeability, which can ensure that the cleaning agent fully contacts the surface of gypsum and glass, thereby improving the cleaning effect.

[0028] Demineralized water: As a solvent, it dissolves the above ingredients to form a uniform cleaning solution. At the same time, demineralized water can also reduce impurities in the cleaning agent and improve the cleaning quality.

[0029] As an example, the complexing agent in the cleaning agent combines with the calcium ions in the gypsum to form a stable complex. This process reduces the solubility of the gypsum, making it easier to remove from the surface of the PV module. The cleaning aid can accelerate the reaction between the cleaning agent and the gypsum, increasing the dissolution rate of the gypsum. At the same time, the action of the penetrant allows the cleaning agent to penetrate deeper into the gypsum and the gypsum-glass interface, thereby accelerating the dissolution process. The penetrant not only has the effect of accelerating dissolution, but also ensures that the cleaning agent fully contacts all areas of the surface of the PV module, including corners and gaps that are difficult to clean. This helps to improve the uniformity and thoroughness of the cleaning.

[0030] Therefore, through the combined effects of complexation, dissolution and penetration of each component, the cleaning agent can effectively remove the gypsum dust on the surface of the photovoltaic module. At the same time, since the cleaning agent does not contain strong acid or strong alkali components, it will not cause corrosion or damage to the photovoltaic module. It can effectively solve the problem of gypsum dust on the surface of the photovoltaic module.

[0031] The second object of the present invention is to provide a photovoltaic module gypsum dust cleaning agent, and the use method thereof is: 1) Use sulfuric acid to adjust the pH value of the cleaning solution to 7.0; Specifically, use an accurate measuring tool, such as a burette or electronic scale, to determine the amount of sulfuric acid required to ensure the accuracy of the pH adjustment.

[0032] Add sulfuric acid to the cleaning solution slowly and gradually while stirring to avoid excessive local acidity that may cause the cleaning solution to fail or become dangerous.

[0033] Real-time monitoring of pH value: Use a pH meter to monitor the pH value of the cleaning solution in real time to ensure that it is adjusted to the neutral range (pH=7±0.5).

[0034] 2) Spray the cleaning solution with adjusted pH value to the gypsum deposition position of the photovoltaic module, using temperature of 5℃~95℃; Use spraying equipment (such as a high-pressure sprayer or spray pot) to ensure that the cleaning liquid can evenly cover the gypsum deposits on the photovoltaic modules. According to the area of ​​the photovoltaic modules and the severity of the gypsum deposits, reasonably control the spraying amount to avoid waste and excessive cleaning.

[0035] 3) After the gypsum is moistened and bubbles begin to form, rinse it with water without added detergent to dissolve the gypsum or flush it out of the photovoltaic panel.

[0036] Initial Rinse: After the plaster is wet and bubbles begin to form, perform an initial rinse using water without added detergent to remove surface plaster and bubbles.

[0037] Continuous flushing: Continue flushing until the gypsum is completely dissolved or flushed out of the photovoltaic panel. During this period, the flushing pressure and flow rate can be appropriately increased to improve the flushing effect.

[0038] Check the flushing effect: During the flushing process, check regularly whether the flushing water is clean and free of foam to determine whether the plaster has been completely rinsed.

[0039] 4) After the plaster is rinsed clean, continue rinsing until the rinse water is clear and free of foam.

[0040] After rinsing, use a clean cloth or paper towel to gently wipe the surface of the photovoltaic module, or use natural air drying to ensure that the surface of the photovoltaic module is completely dry. After cleaning, conduct a comprehensive inspection of the photovoltaic module to ensure that there is no missed gypsum deposition or cleaning fluid residue. At the same time, record the problems and improvement measures during the cleaning process to provide a reference for subsequent maintenance.

[0041] The formula combination of the gypsum dust cleaning agent for photovoltaic modules also involves the principle of foaming, which usually involves the ability of surfactants (which may be part of the penetrant or cleaning aid in this formula) to form bubbles in the liquid. The formation and stability of these bubbles are affected by many factors, including surface tension, viscosity of the solution, temperature, and the structure and concentration of the surfactant. As surfactants, sodium cocoyl glycinate, sodium lauroyl sarcosinate, sodium cycloglutamate (penetrant) have the ability to reduce the surface tension of the solution. When they are dissolved in water, one end of the molecule is hydrophilic (towards the water) and the other end is hydrophobic (towards the air). This structure enables them to form a thin film on the surface of the liquid, thereby stabilizing the bubbles. Ammonium citrate, ammonium carbonate, sodium carbonate (cleaning aid) are mainly used as cleaning aids, but they may also have certain surface activity and contribute to the foaming phenomenon. In particular, when they are combined with surfactants (such as penetrants), the foaming effect may be enhanced. Deionized water as a solvent not only dissolves the above ingredients, but also reduces impurities, thereby improving the purity and foaming performance of the cleaning agent. Solutions with higher purity generally form more stable, longer-lasting bubbles.

[0042] In addition, an increase in temperature usually reduces the viscosity of the solution, making it easier for surfactant molecules to move and gather on the surface of the liquid, thereby enhancing the foaming ability. However, too high a temperature may also cause the bubbles to collapse faster. The viscosity of the solution also affects the stability of the bubbles. A more viscous solution may be more difficult to form and maintain bubbles.

[0043] Furthermore, when the cleaning agent solution is stirred, sprayed, or otherwise introduced with air, the surfactant molecules form a thin film on the surface of the liquid and form bubbles around the air nuclei. These bubbles remain intact due to the stabilizing effect of the surfactant molecules until they burst due to buoyancy, surface tension imbalance, or other factors. The formation and bursting of bubbles can agitate the solution and increase the contact area between the cleaning agent and the gypsum dust, thereby improving the cleaning efficiency. In some cases, the generation and disappearance of bubbles can be used as an indication of the progress of cleaning. For example, when the number of bubbles decreases or disappears, it may mean that the cleaning agent has effectively removed the gypsum dust.

[0044] In addition, according to research, when the cleaning liquid with adjusted pH value is sprayed on the gypsum deposition position of the photovoltaic module, there is a certain relationship between the spraying amount and the gypsum deposition area. Definition: The spraying amount (Q) is the volume of cleaning liquid sprayed on the surface of the photovoltaic module per unit time, and the unit is usually milliliter (mL) or liter (L). The gypsum deposition area (S) is the area covered by gypsum deposition on the photovoltaic module, and the unit is usually square centimeters (cm²) or square meters (m²). The spraying amount per unit area (P) is the volume of cleaning liquid sprayed per square meter or per square centimeter, and the unit is usually mL / cm² or L / m².

[0045] The relationship between the spraying volume (Q), the gypsum deposition area (S) and the spraying volume per unit area (P) can be expressed as: Q = P × S.

[0046] The formula shows that the spraying volume is equal to the product of the spraying volume per unit area and the gypsum deposition area. Determination of the spraying volume per unit area: The spraying volume per unit area (P) is usually determined based on experimental data or experience. It may be affected by many factors, such as the concentration of the cleaning fluid, the performance of the spraying equipment, the material and surface condition of the photovoltaic module, etc.

[0047] Calculation of spraying volume: After the gypsum deposition area (S) and the spraying volume per unit area (P) are known, the required spraying volume (Q) can be calculated using the above formula. According to the calculation, if the gypsum deposition area is 1m² and the spraying volume per unit area is 0.1~0.5L / m², the required spraying volume is 0.1~0.5L.

[0048] In actual operation, it is necessary to ensure that the cleaning liquid can be sprayed evenly on the surface of the gypsum deposit to avoid local insufficient cleaning or excessive cleaning. The choice of spraying pressure and angle will also affect the cleaning effect. Appropriate spraying pressure and angle can ensure that the cleaning liquid can fully penetrate into the gypsum deposit layer, thereby improving the cleaning efficiency. The pH value of the cleaning liquid has an important influence on the cleaning effect. The pH value of the cleaning liquid needs to be adjusted according to the properties of the gypsum deposits and the cleaning requirements to ensure the best cleaning effect.

[0049] When cleaning PV panels, water without detergent is used for flushing. It is very important to control the water pressure. The impact pressure of the cleaning equipment on the panel must be controlled within a certain range to avoid cracks caused by improper force. This means that the water pressure cannot be too high to avoid damage to the PV panels. It is further emphasized that caution should be taken during the cleaning process to avoid using too high water pressure. It is usually recommended to use low-pressure water flushing to ensure that no damage is caused to the PV panels. Generally speaking, the water pressure should be controlled at 10~200 kPa, which can effectively remove dust and dirt while protecting the PV panels from damage.

[0050] The present invention is further described in detail below with reference to specific embodiments.

[0051] Embodiment 1: A photovoltaic module gypsum dust cleaning agent is prepared, the composition of which is: 20% by mass of tetrasodium glutamate diacetate, 10% by mass of tetrasodium aspartate diacetate, 5% by mass of ammonium citrate, 5% by mass of sodium carbonate, 0.5% by mass of sodium cocoyl glycinate, and the remaining components are desalted water.

[0052] Gypsum dust cleaning was carried out in the photovoltaic power station affected by "gypsum rain" with an ambient temperature of 28°C.

[0053] The cleaning steps are as follows: 1) Add sulfuric acid to the cleaning solution to adjust the pH value of the cleaning solution to 7.0; 2) Manually spray the cleaning solution with adjusted pH value to the gypsum deposition position of the photovoltaic module; 3) Once the gypsum is moistened and bubbles begin to form, immediately rinse it with water without detergent to dissolve the gypsum or flush it out of the photovoltaic panel.

[0054] 4) After the plaster is rinsed clean, continue rinsing until the rinse water is clear and free of foam.

[0055] The cleaning waste liquid was collected and subjected to biodegradability tests. The biodegradation rate of the cleaning waste liquid exceeded 80% within 14 days.

[0056] Embodiment 2: A photovoltaic module gypsum dust cleaning agent is prepared, whose composition is: 10% by mass of tetrasodium glutamate diacetate, 10% by mass of tetrasodium aspartate diacetate, 10% by mass of trisodium dicarboxymethylalanine, 3% by mass of ammonium citrate, 2% by mass of sodium carbonate, 2% by mass of ammonium carbonate, 0.5% by mass of sodium cocoyl glycinate, 0.5% by mass of sodium cycloglutamate, and the remaining components are deionized water.

[0057] Gypsum dust cleaning was carried out in the photovoltaic power station affected by "gypsum rain" with an ambient temperature of 36°C.

[0058] The cleaning steps are as follows: 1) Add sulfuric acid to the cleaning solution to adjust the pH value of the cleaning solution to 7.05; 2) Manually spray the cleaning liquid with adjusted pH value to the gypsum deposition position of the photovoltaic module; the spraying amount per unit area is 0.5L / m², and the waiting reaction time is 5 minutes.

[0059] 3) After the gypsum is moistened and bubbles begin to form, immediately rinse it with water without detergent added. The water pressure is 10kPa, which can dissolve the gypsum or flush it out of the photovoltaic panel.

[0060] 4) After the plaster is rinsed clean, continue rinsing until the rinse water is clear and free of foam.

[0061] Through experiments, cleaning waste liquid was collected and biodegradability tests were carried out. The biodegradation rate of the cleaning waste liquid exceeded 70% within 14 days.

[0062] Embodiment 3: A photovoltaic module gypsum dust cleaning agent is prepared, the composition of which is: 10% by mass of tetrasodium glutamate diacetate, 5% by mass of trisodium dicarboxymethylalanine, 2% by mass of ammonium citrate, 3% by mass of sodium carbonate, 1% by mass of sodium cocoyl glycinate, and the remaining components are 80% desalted water.

[0063] Gypsum dust cleaning was carried out in a photovoltaic power station at an ambient temperature of 5°C.

[0064] The cleaning steps are as follows: 1) Add sulfuric acid to the cleaning solution to adjust the pH value of the cleaning solution to 7.0; 2) Manually spray the cleaning liquid with adjusted pH value to the gypsum deposition position of the photovoltaic module; the spraying amount per unit area is 0.1L / m², and the waiting reaction time is 10min.

[0065] 3) After the gypsum is moistened and bubbles begin to form, immediately rinse it with water without detergent added. The water pressure is 50kPa, which can dissolve the gypsum or flush it out of the photovoltaic panel.

[0066] 4) After the plaster is rinsed clean, continue rinsing until the rinse water is clear and free of foam.

[0067] The cleaning waste liquid was collected and subjected to biodegradability tests. The biodegradation rate of the cleaning waste liquid exceeded 75% within 13 days.

[0068] Embodiment 4: A photovoltaic module gypsum dust cleaning agent is prepared, whose composition is: 20% by mass of tetrasodium glutamate diacetate, 10% by mass of tetrasodium aspartate diacetate, 5% by mass of trisodium dicarboxymethylalanine, 6% by mass of ammonium citrate, 2% by mass of sodium carbonate, 1% by mass of ammonium carbonate, 0.5% by mass of sodium cocoyl glycinate, 0.5% by mass of sodium cycloglutamate, and 0.5% by mass of sodium cycloglutamate, and the remaining components are deionized water.

[0069] Gypsum dust cleaning was carried out in the photovoltaic power station affected by "gypsum rain" with an ambient temperature of 95°C.

[0070] The cleaning steps are as follows: 1) Add sulfuric acid to the cleaning solution to adjust the pH value of the cleaning solution to 7.0; 2) Manually spray the cleaning liquid with adjusted pH value to the gypsum deposition position of the photovoltaic module; the spraying amount per unit area is 0.3L / m², and the waiting reaction time is 20min.

[0071] 3) After the gypsum is moistened and bubbles begin to form, immediately rinse it with water without detergent added, with a water pressure of 200kPa, which can dissolve the gypsum or flush it out of the photovoltaic panel.

[0072] 4) After the plaster is rinsed clean, continue rinsing until the rinse water is clear and free of foam.

[0073] Through experiments, cleaning waste liquid was collected and biodegradability tests were carried out. The biodegradation rate of the cleaning waste liquid exceeded 70% within 15 days.

[0074] Embodiment 5: A photovoltaic module gypsum dust cleaning agent is prepared, the composition of which is: 10% by mass of tetrasodium glutamate diacetate, 15% by mass of tetrasodium aspartate diacetate, 2% by mass of ammonium citrate, 5% by mass of sodium carbonate, 1.5% by mass of sodium cycloglutamate, and the remaining components are desalted water.

[0075] Gypsum dust cleaning was carried out in the photovoltaic power station affected by "gypsum rain" with an ambient temperature of 28°C.

[0076] The cleaning steps are as follows: 1) Add sulfuric acid to the cleaning solution to adjust the pH value of the cleaning solution to 7.0; 2) Manually spray the cleaning liquid with adjusted pH value to the gypsum deposition position of the photovoltaic module; the spraying amount per unit area is 0.1L / m², and the waiting reaction time is 15min.

[0077] 3) After the gypsum is moistened and bubbles begin to form, immediately rinse it with water without detergent added. The water pressure is 10kPa, which can dissolve the gypsum or flush it out of the photovoltaic panel.

[0078] 4) After the plaster is rinsed clean, continue rinsing until the rinse water is clear and free of foam.

[0079] The cleaning waste liquid was collected and subjected to biodegradability tests. The biodegradation rate of the cleaning waste liquid exceeded 75% within 13 days.

[0080] Embodiment 6: A photovoltaic module gypsum dust cleaning agent is prepared, whose composition is: 5% by mass of tetrasodium glutamate diacetate, 2% by mass of tetrasodium aspartate diacetate, 3% by mass of trisodium dicarboxymethylalanine, 2% by mass of ammonium citrate, 4% by mass of sodium carbonate, 4% by mass of ammonium carbonate, 1.5% by mass of sodium cocoyl glycinate, 0.5% by mass of sodium cycloglutamate, and the remaining components are deionized water.

[0081] Gypsum dust cleaning was carried out in the photovoltaic power station affected by "gypsum rain" with an ambient temperature of 60℃.

[0082] The cleaning steps are as follows: 1) Add sulfuric acid to the cleaning solution to adjust the pH value of the cleaning solution to 6.95; 2) Manually spray the cleaning liquid with adjusted pH value to the gypsum deposition position of the photovoltaic module; the spraying amount per unit area is 0.2L / m², and the waiting reaction time is 8 minutes.

[0083] 3) After the gypsum is moistened and bubbles begin to form, immediately rinse it with water without detergent added. The water pressure is 100kPa, which can dissolve the gypsum or flush it out of the photovoltaic panel.

[0084] 4) After the plaster is rinsed clean, continue rinsing until the rinse water is clear and free of foam.

[0085] Through experiments, cleaning waste liquid was collected and biodegradability tests were carried out. The biodegradation rate of the cleaning waste liquid exceeded 72% within 14 days.

[0086] In summary, the present invention provides a photovoltaic module gypsum dust cleaning agent and a method of use. The cleaning agent can quickly dissolve gypsum without soaking or long-term rinsing. At the same time, the cleaning agent is easily biodegradable and environmentally friendly. The biodegradation rate of the waste liquid can exceed 70% to 80% in a short time (13 to 15 days). In particular, the cleaning agent has a fast dissolution rate for gypsum without soaking or long-term rinsing; it has no corrosion to easily corroded parts such as aluminum alloy frames and galvanized brackets; the cleaning agent is easily biodegradable. In particular, it has a good effect on cleaning gypsum dust on photovoltaic modules.

[0087] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A photovoltaic module gypsum dust cleaning agent, characterized in that: Calculated by mass percentage, it includes: 10%-40% of complexing agent, 5%-10% of cleaning aid, 0.5%-2% of penetrant and the balance of desalted water.

2. A photovoltaic module gypsum dust cleaning agent according to claim 1, characterized in that: The complexing agent is a random mixture of one or more of tetrasodium glutamate diacetate, tetrasodium aspartate diacetate and trisodium dicarboxymethyl alanine.

3. A photovoltaic module gypsum dust cleaning agent according to claim 1, characterized in that: The cleaning aid is a random mixture of one or more of ammonium citrate, ammonium carbonate and sodium carbonate.

4. A photovoltaic module gypsum dust cleaning agent according to claim 1, characterized in that: The penetrant is a mixture of one or more of sodium cocoyl glycinate, sodium lauroyl sarcosinate and sodium cycloglutamate.

5. The method for using the photovoltaic module gypsum dust cleaning agent according to any one of claims 1 to 4, characterized in that: The steps include: Use sulfuric acid to adjust the pH value of the cleaning solution to neutral; Spray the cleaning solution with adjusted pH value onto the gypsum deposition position of the photovoltaic module; After the gypsum is moistened and bubbles begin to form, rinse it with water without detergent until the gypsum is dissolved or flushed out of the photovoltaic panel; After the plaster is rinsed clean, continue rinsing until the rinse water is clear and free of foam.

6. The method for using a photovoltaic module gypsum dust cleaning agent according to claim 5, characterized in that: The temperature during flushing is 5℃~95℃.

7. The method for using a photovoltaic module gypsum dust cleaning agent according to claim 5, characterized in that: Use sulfuric acid to adjust the pH value of the cleaning solution to 7±0.

5.

8. The method for using a photovoltaic module gypsum dust cleaning agent according to claim 5, characterized in that: When the cleaning liquid with adjusted pH value is sprayed onto the gypsum deposition position of the photovoltaic module, the spraying amount per unit area is 0.1~0.5L / m².

9. The method for using a photovoltaic module gypsum dust cleaning agent according to claim 5, characterized in that: Spray the cleaning solution with adjusted pH value onto the gypsum deposition position of the photovoltaic module and wait for the reaction time to be 5 to 20 minutes.

10. The method for using the photovoltaic module gypsum dust cleaning agent according to claim 5, characterized in that: When flushing with water without detergent added, the flushing water pressure is 10~200 kPa.