Water cleaning system for flexible support photovoltaic module and use method of water cleaning system

Abstract

The invention discloses a water cleaning system for a flexible support photovoltaic module and a using method of the water cleaning system. The water cleaning system comprises a water supply main pipe, cleaning subareas and a controller. The water supply main pipe is connected with the pressurizing water supply device through a water inlet pipe, and water supply branch vertical pipes are arranged on the portion, surrounding the photovoltaic module to be cleaned, corresponding to all the cleaning subareas. The pressurizing water supply equipment is used for supplying pressurized water to the water supply main pipe; the controller is connected with an electric control valve on each water supply branch vertical pipe, that is, the controller is connected with a pressure sensor of the pressurizing water supply equipment, and the pressurizing water supply equipment is controlled to be started and the water supply branch vertical pipes are controlled to be communicated according to the reading of the pressure sensor and the cleaning subarea needing to be started; all the cleaning subareas are fixed to the flexible support and arranged inwards from the two ends of a pile column and a supporting rod of the flexible support, and each cleaning subarea comprises a water supply transverse branch pipe; and each water supply transverse branch pipe is connected with the corresponding water supply vertical branch pipe through a flexible rubber elbow. The defects of an existing cleaning system in the aspects of adaptability, operability, efficiency and the like can be overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible support photovoltaic power generation engineering, and particularly relates to a water cleaning system for flexible support photovoltaic modules and a method for using the same. Background Art

[0002] The inclination angle of photovoltaic modules is small, and dust and dirt are likely to accumulate on the surface, which will easily affect their power generation efficiency. The reasons mainly include two aspects: First, the accumulation of surface dust and dirt reduces the light transmittance, thereby reducing the radiation received on the module surface; Second, the dirt attached to the module surface will form shadows and cause hot spot effects locally, continuously generating heat and even burning out the module. The above shows that in order to ensure the power generation efficiency of photovoltaic modules and prevent equipment accidents at the same time, the photovoltaic modules should be cleaned.

[0003] In recent years, with the reduction of land resources suitable for ordinary photovoltaic projects in China, the high land cost has made power station owners start to overcome mountain photovoltaic projects with relatively complex terrains and special terrain photovoltaic projects such as fish ponds and sewage treatment plants before. Due to the advantages in terms of cost and environmental adaptability, flexible supports have been increasingly widely used in the market.

[0004] To sum up, the change of technology has also brought challenges. The flexible support is composed of pile columns, steel beams, struts, suspension cables, etc. The modules are fixed on the suspension cables off the ground. Due to the special structural features such as the large span, high off the ground, and suspension cable installation of the support, there is currently no complete set of module cleaning design methods.

[0005] Therefore, how to solve the deficiencies of the existing cleaning system in terms of adaptability, operability, and efficiency has become an urgent technical problem for those skilled in the art. Summary of the Invention

[0006] In view of the above-mentioned defects of the prior art, the present invention provides a water cleaning system for flexible support photovoltaic modules and a method for using the same, and the purpose is to solve the deficiencies of the existing cleaning system in terms of adaptability, operability, and efficiency.

[0007] To achieve the above purpose, the present invention discloses a water cleaning system for flexible support photovoltaic modules, including a water supply main pipe arranged in a ring around the photovoltaic module to be cleaned, a plurality of cleaning partitions connected to the water supply main pipe and arranged above the photovoltaic module to be cleaned, and a controller for controlling the operation of each cleaning partition;

[0008] The water supply main pipe is connected to a pressurized water supply device through a water inlet pipe, and a water supply branch riser is provided corresponding to each cleaning partition in the part around the photovoltaic module to be cleaned;

[0009] The pressurized water supply device is used to supply pressurized water to the water supply main pipe;

[0010] The controller is associated with the electric control valves on each of the water supply branch risers by wired or wireless means, that is, the controller is connected to the pressure sensor of the pressurized water supply device. According to the readings of the pressure sensor and the cleaning zones to be opened, the controller controls the pressurized water supply device to start and conduct with the water supply branch risers corresponding to the cleaning zones to be opened.

[0011] All the cleaning zones are fixed to the flexible support, and are arranged inward from both ends of the piles and struts of the flexible support. Each cleaning zone includes a water supply cross-branch corresponding to the corresponding water supply branch riser, and nozzles evenly distributed along the length direction of each water supply cross-branch.

[0012] Each water supply cross-branch is connected to the corresponding water supply branch riser through a flexible rubber elbow.

[0013] Preferably, the other end of the pressurized water supply device is connected to a reliable water source / water supply network.

[0014] More preferably, the pressurizing components of the pressurized water supply device include at least two parallel pumps.

[0015] A Y-type filter is provided at the water inlet end of each pump, and a check valve is connected to the water outlet end through a flexible joint.

[0016] More preferably, a maintenance gate valve is provided between each Y-type filter and the reliable water source / water supply network, and between each check valve and the water inlet pipe.

[0017] More preferably, a pressure relief valve and a drain valve are provided on the water inlet pipe.

[0018] Preferably, the water supply cross-branch of each cleaning zone is fixed to the suspension cable of the corresponding flexible support by wire rope clips.

[0019] Preferably, each water supply cross-branch is a small-diameter thin-wall stainless steel pipe. It is best to give the definition of how small is considered a small diameter and how thick is considered a thin wall.

[0020] Preferably, each nozzle is a low-flow wide-angle solid cone water mist nozzle.

[0021] The present invention also provides a method for using the water cleaning system for flexible support photovoltaic modules. The output flow of the pressurized water supply device only meets the use of one cleaning zone, and includes the following steps:

[0022] Step 1: When the timer of the controller reaches the set value, the controller starts and supplies water from the pressurized water supply device to the water supply main pipe.

[0023] Step 2: After the water pressure in the water supply main pipe feedback by the pressure sensor of the pressurized water supply equipment reaches the requirement, the controller sequentially opens the electromagnetic control valves corresponding to all the cleaning zones that need to be opened according to the preset sequence, and the opening and closing intervals of the electromagnetic control valves in each cleaning zone correspond to the set cleaning duration;

[0024] Step 3: It ends after all the cleaning zones that need to be opened are opened and closed in sequence once.

[0025] Preferably, after completing Step 3, or before executing Step 2, the water spraying cleaning is manually performed on any one of the cleaning zones designated by the user without time limit until the user's instruction to stop.

[0026] Advantages of the present invention:

[0027] The present invention overcomes the problems such as the special structure of the component support and the difficulty in fixing the cleaning system, and improves the stability and operation convenience of the system.

[0028] The present invention improves the cleanliness of the cleaning system. By using solid cone water mist nozzles, the water mist is evenly distributed to avoid cleaning dead corners.

[0029] The present invention optimizes the water cleaning process. The automatic system optimizes the limitations of manual operation of non-accessible systems. The use of small flow nozzles reduces water waste, and the supporting low-power water supply equipment reduces energy consumption and effectively reduces the cost of the system.

[0030] The present invention adopts a lightweight structure fixed by small-diameter thin-walled seamless steel pipes and wire rope clips, which reduces the overall load, improves the adaptability and operability of the system, and uses flexible joints in the horizontal and vertical sections to solve the problem of metal fatigue caused by the vibration of rigid pipes along with the cable, and is applicable to different types of flexible support photovoltaic modules.

[0031] The present invention is particularly applicable to agricultural photovoltaic projects and mountain grassland projects, and can effectively combine the dual needs of photovoltaic power generation and agricultural production.

[0032] The high-efficiency cleaning function and the reuse of water resources of the present invention greatly improve the operation efficiency and economic benefits of photovoltaic modules, and have a positive effect on promoting the combination of agriculture and photovoltaics and promoting regional economic development.

[0033] The present invention can achieve efficient, economical and environmental protection cleaning effects, and meet the needs of modern photovoltaic industry for clean, green and efficient energy utilization.

[0034] The following will further illustrate the concept, specific structure and technical effects of the present invention with reference to the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention. Description of the Drawings

[0035] Figure 1 Schematic structural diagram showing an embodiment of the present invention.

[0036] Figure 2 Flow chart of the use showing an embodiment of the present invention. Detailed implementation manners

[0037] Embodiment

[0038] As Figure 1 As shown, a water cleaning system for a flexible support photovoltaic module includes a water supply main pipe 1 arranged in a ring around the photovoltaic module to be cleaned, a plurality of cleaning partitions 3 connected to the water supply main pipe 1 and arranged above the photovoltaic module to be cleaned, and a controller 4 for controlling the operation of each cleaning partition 3;

[0039] The part of the water supply main pipe 1 that is connected to the pressurized water supply device 2 through the water inlet pipe 11 and surrounds the photovoltaic module to be cleaned is provided with a water supply branch riser 14 corresponding to each cleaning partition 3;

[0040] The pressurized water supply device 2 is used to supply pressurized water to the water supply main pipe 1;

[0041] The controller 4 is associated with the electric control valve 141 on each water supply branch riser 14 by wired or wireless means, that is, the controller 4 is connected to the pressure sensor 27 of the pressurized water supply device 2. According to the reading of the pressure sensor 27 and the cleaning partition 3 to be opened, the controller 4 controls the pressurized water supply device 2 to be turned on and conducts with the water supply branch riser 14 corresponding to the cleaning partition 3 to be opened;

[0042] All the cleaning partitions 3 are fixed to the flexible support and are arranged inward from both ends of the pile columns and struts of the flexible support. Each cleaning partition 3 includes a water supply cross pipe 31 corresponding to the corresponding water supply branch riser 14, and nozzles 32 evenly distributed along the length direction of each water supply cross pipe 31;

[0043] Each water supply cross pipe 31 is connected to the corresponding water supply branch riser 14 through a flexible rubber elbow 5.

[0044] Based on the structural specialities of the flexible support such as large span, high off - ground height, and suspension cable installation, on the one hand, the present invention can ensure that the system is simple and reasonable while minimizing the additional load on the suspension cable. All the cleaning partitions 3 are arranged in a form of being arranged inward from both ends of the pile columns and struts, reducing the liquid transportation path, reducing the pipeline head loss, and avoiding metal fatigue caused by the oscillation of the suspension cable at the center of the pipe section when the pipeline is arranged along the suspension cable over a long distance;

[0045] On the other hand, each water supply cross pipe 31 is connected to the corresponding water supply branch riser 14 through a flexible rubber elbow 5, which can further avoid metal fatigue caused by the oscillation of the suspension cable and effectively slow down the pipeline damage. The water supply cross pipe 31 is fixed to the suspension cable by wire rope clips and should not affect the installation of the module.

[0046] On the other hand, considering that this system is an auxiliary project for a photovoltaic power generation project, the project investment should be reduced as much as possible. Therefore, on the premise that the diameter of the water supply cross-branch pipe 31 is small, multiple cleaning zones 3 are divided to reduce the liquid transportation path, lower the pipeline head loss, and perform cleaning in batches one by one.

[0047] In some embodiments, the other end of the pressurized water supply device 2 is connected to a reliable water source / water supply pipe network.

[0048] In some embodiments, the pressurizing component of the pressurized water supply device 2 includes at least two parallel water pumps 21;

[0049] A Y-shaped filter 22 is provided at the water inlet end of each water pump 21, and a check valve 24 is connected to the water outlet end through a flexible joint 23.

[0050] In some embodiments, a maintenance gate valve 25 is provided between each Y-shaped filter 22 and the reliable water source / water supply pipe network, and between each check valve 24 and the water inlet pipe 11.

[0051] In some embodiments, a pressure relief valve 12 and a drain valve 13 are provided on the water inlet pipe 11.

[0052] In some embodiments, the water supply cross-branch pipe of each cleaning zone 3 is fixed to the corresponding flexible support suspension cable by a wire rope clip 33.

[0053] In some embodiments, each water supply cross-branch pipe 31 is a small-diameter thin-wall stainless steel pipe. It would be best if the definitions of how small is considered small-diameter and what wall thickness is considered thin-wall could be given.

[0054] In practical applications, thin-wall stainless steel pipes are selected as the water supply cross-branch pipes 31, taking advantage of the fact that this type of pipe has a wide variety of specifications, light weight, high strength, and simple installation.

[0055] In some embodiments, each spray head 32 is a low-flow wide-angle solid cone water mist spray head.

[0056] In practical applications, low-flow wide-angle solid cone water mist spray heads are used, and at the same time, the number of spray heads working simultaneously in the same zone is reduced. Therefore, a low-power pump group with small flow and high head is designed to reduce the later operation and maintenance costs.

[0057] As Figure 2 shown, the present invention also provides a method for using the water cleaning system for flexible support photovoltaic modules. The output flow of the pressurized water supply device 2 only meets the usage of one cleaning zone 3, and includes the following steps:

[0058] Step 1: When the timer 41 of the controller 4 reaches the set value, the controller 4 starts and supplies water to the water supply main pipe 1 through the pressurized water supply device 2;

[0059] Step 2: After the water pressure in the water supply main pipe 1 fed back by the pressure sensor 27 of the pressurized water supply device 2 reaches the requirement, the controller 4 sequentially opens the electric control valves 141 corresponding to all the cleaning zones 3 that need to be opened according to the preset sequence, and the opening and closing intervals of the electric control valves 141 in each cleaning zone 3 correspond to the set cleaning duration; after the electric control valves 141 are opened, the nozzles 32 in the corresponding cleaning zones 3 all spray and clean the photovoltaic modules to be cleaned.

[0060] Step 3: It ends after all the cleaning zones 3 that need to be opened are opened and closed in sequence once.

[0061] In some embodiments, after completing Step 3, or before executing Step 2, any one of the cleaning zones 3 specified by the user is manually sprayed and cleaned without time limit until the user's instruction to stop.

[0062] Through the above technical means, the staff can also manually start the sectional valve and the feed water pump according to the surface cleanliness of the components in each zone. It should be noted that to ensure the cleaning intensity of the components, the system design pressure and flow can only meet the simultaneous operation of the nozzles in a single zone.

[0063] According to the special structure of the flexible support of the photovoltaic module in the present invention, the pipeline layout should be overall considered. On the premise of minimizing the additional suspension load as much as possible and not affecting the installation and operation of the components, the system is ensured to be simple, reasonable, safe and practical.

[0064] The water supply main pipe 1 of the present invention can adopt a PE100 material water supply pipe, which is connected by hot melting. The water supply cross-branch pipe 31 adopts a thin-walled stainless steel pipe, which is connected by threading. The joints of the two material pipes are connected by flanges. The water supply main pipe 1 should slope towards the drain point with a longitudinal slope of 0.002. An electric control valve 141 is arranged on the water supply branch vertical pipe 14, and the installation height of the electric control valve 141 is preferably 1.10 m from the ground.

[0065] Considering that the suspension is affected by the environment and vibrates greatly and frequently in daily life, it is easy to cause metal fatigue and bending damage to the metal pipeline, especially for the pipeline joints and the pipeline at the suspension center. Therefore, each water supply cross-branch pipe 31 and the corresponding water supply branch vertical pipe 14 are connected through a flexible rubber elbow 5 to avoid repeated bending damage of the pipeline; for the pipe section at the suspension center, the present invention adopts a structure arranged from both ends of the pile column and the strut of the flexible support inward to avoid excessive bending amplitude at the suspension center, which is not conducive to pipeline installation and steel pipe damage.

[0066] The present invention adopts an industrial wide-angle solid cone water mist nozzle. Referring to the product parameters of a well-known foreign brand: the spray angle is 120°, the working pressure is 0.2 MPa, the rated flow rate is 4.00 L / min, the interface diameter is DN15 (1 / 4"), and the effective spray distance is 1.5 m.

[0067] Taking the above as an example, in practical applications, the number of simultaneously operating nozzles of the present invention is usually 10 to 20, the minimum flow rate is 0.70 L / s, and the working pressure of the nozzles is 0.35 MPa; therefore, a vertical single-stage centrifugal pump with Q = 3.6 m 3 / h, H = 0.50 MPa, and P = 2.2 k is selected as the water pump 21; the pressure relief valve is selected as the Y42X type with a set pressure of 0.55 MPa.

[0068] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in this technical field based on the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art shall fall within the protection scope determined by the claims.

Claims

1. A water cleaning system for flexible support photovoltaic modules; characterized in that: The invention comprises a water supply main pipe (1) arranged in a ring shape around a photovoltaic component to be cleaned, a plurality of cleaning partitions (3) connected to the water supply main pipe (1) and arranged above the photovoltaic component to be cleaned, and a controller (4) for controlling the operation of each cleaning partition (3); The water supply main pipe (1) is connected to the pressurized water supply equipment (2) via a water inlet pipe (11), and a water supply branch pipe (14) is provided in the portion surrounding the photovoltaic module to be cleaned and corresponding to each of the cleaning partitions (3); The pressurized water supply equipment (2) is used to supply pressurized water to the water supply main (1); The controller (4) is associated with the electric control valve (141) on each of the water supply branch pipes (14) by wired or wireless means, that is, the controller (4) is connected to the pressure sensor (27) of the boost water supply device (2), and controls the boost water supply device (2) to be turned on and the water supply branch pipe (14) corresponding to the cleaning partition (3) to be turned on according to the reading of the pressure sensor (27) and the cleaning partition (3) to be turned on. All the cleaning zones (3) are fixed to the flexible support and are arranged inward from the piles and the two ends of the support rods of the flexible support, and each includes a water supply lateral branch pipe (31) corresponding to the corresponding water supply vertical branch pipe (14), and nozzles (32) evenly distributed along the length direction of each water supply lateral branch pipe (31); Each of the water supply lateral branch pipes (31) is connected to the corresponding water supply vertical branch pipe (14) via a flexible rubber elbow (5).

2. The water cleaning system for flexible support photovoltaic modules according to claim 1, characterized in that: The other end of the pressurized water supply device (2) is connected to a reliable water source / water supply network.

3. The water cleaning system for flexible support photovoltaic modules according to claim 2, characterized in that: The pressurizing component of the pressurized water supply equipment (2) includes at least two water pumps (21) connected in parallel; The water inlet end of each water pump (21) is provided with a Y-type filter (22), and the water outlet end is connected to a check valve (24) via a flexible joint (23).

4. The water cleaning system for flexible support photovoltaic modules according to claim 3, characterized in that: A maintenance gate valve (25) is provided between each Y-type filter (22) and the reliable water source / water supply network, and between each check valve (24) and the water inlet pipe (11).

5. The water cleaning system for flexible support photovoltaic modules according to claim 1, characterized in that: The water inlet pipe (11) is provided with a pressure relief valve (12) and a water discharge valve (13).

6. The water cleaning system for flexible support photovoltaic modules according to claim 1, characterized in that: The water supply lateral branch pipe of each cleaning partition (3) is fixed to the corresponding flexible bracket suspension cable by means of a wire rope clamp (33).

7. The water cleaning system for flexible support photovoltaic modules according to claim 1, characterized in that: Each of the water supply lateral branches (31) is a small-diameter, thin-walled stainless steel pipe. It is best to be able to give a definition of how small the diameter is and how thick the wall is considered thin-walled.

8. The water cleaning system for flexible support photovoltaic modules according to claim 1, characterized in that: Each of the nozzles (32) is a low-flow wide-angle solid cone water mist nozzle.

9. A method for using a water cleaning system for a flexible support photovoltaic module, characterized in that: The output flow of the boost water supply device (2) is only sufficient for use in one cleaning zone (3), and the method comprises the following steps: Step 1: When the timer (41) of the controller (4) reaches a set value, the controller (4) starts to supply water to the booster water supply device (2) and the water supply main (1); Step 2: When the water pressure in the water supply main pipe (1) fed back by the pressure sensor (27) of the booster water supply device (2) reaches the required pressure, the controller (4) opens the electric control valves (141) corresponding to all the cleaning partitions (3) that need to be opened in sequence according to a preset sequence, and the opening and closing intervals of the electric control valves (141) of each cleaning partition (3) correspond to the set cleaning time; Step 3, after all the cleaning partitions (3) that need to be opened are opened and closed in sequence for one round, the process ends.

10. The method for using the water cleaning system for the flexible support photovoltaic assembly according to claim 9, characterized in that: After completing step 3, or before executing step 2, any of the cleaning partitions (3) designated by the user is manually sprayed with water for an unlimited time until the user instructs to stop.

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