Off-grid photovoltaic water electrolysis hydrogen production coupling control system

Abstract

The utility model belongs to photovoltaic system field, propose a kind of off-grid photovoltaic water electrolysis hydrogen production coupling control system, including solar power generation system, energy storage system, coupling control device and hydrogen production device, hydrogen production device includes electrolytic cell, water tank and gas storage equipment, the output side of gas storage equipment is provided with hydrogen gas utilization equipment and oxygen utilization equipment, water tank includes 1# water cavity, 2# water cavity, 3# water cavity and 4# water cavity, water tank is provided with inlet pipe system and outlet pipe system, outlet pipe system includes outlet water main pipe, 4 outlet water branch pipes and outlet water valve. The utility model discloses by adopting 4 combined water storage cavities, water can be supplied to electrolytic cell in order through outlet pipe system from 1# water cavity to 4# water cavity, not only it is favorable to guarantee water supply timeliness, also leave sufficient time for water treatment tower to treat water quality, and it is favorable to reduce water quality residue of outlet water main pipe in one complete supply cycle, it is favorable to guarantee the performance of the system electrolytic hydrogen production, suitable for large-scale promotion.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic systems, and in particular relates to an off-grid photovoltaic electrolysis water production hydrogen production coupling control system. Background Technology

[0002] Photovoltaic electrolysis of water to produce hydrogen is a technology that converts solar energy into hydrogen energy. It combines the two processes of photovoltaic power generation and water electrolysis to produce hydrogen, and is an important way to achieve hydrogen production from renewable energy sources.

[0003] Existing patent CN202211055378.2 discloses an off-grid photovoltaic hydrogen production coupling control system. This system generates electricity through photovoltaic power generation equipment, and the generated electricity is regulated by a coupling control module. Part of the electricity is stored in a battery, while the remainder is supplied to the hydrogen production module for hydrogen production. This system can effectively convert and utilize solar energy, electrical energy, hydrogen energy, and thermal energy under photovoltaic-hydrogen coupling, improving the comprehensive utilization efficiency of renewable energy in green electricity production. However, since water electrolysis generally uses a single water tank, although there is a water level alarm mechanism, the flow rate supplying the electrolyzer may be untimely in a short period, affecting the timing of water replenishment and impacting the efficiency of subsequent water electrolysis. Utility Model Content

[0004] This invention addresses the technical problems existing in the aforementioned photovoltaic systems by proposing an off-grid photovoltaic electrolysis water hydrogen production coupling control system that is rationally designed, facilitates water supply and water quality treatment, and helps ensure the performance of water electrolysis.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides an off-grid photovoltaic electrolysis water production hydrogen production coupling control system, including a solar power generation system, an energy storage system, a coupling control device, and a hydrogen production device. The hydrogen production device includes an electrolyzer, with a water tank and a gas storage device respectively installed at the supply and output ends of the electrolyzer. A hydrogen utilization device and an oxygen utilization device are installed on the output side of the gas storage device. The water tank includes four 2×2 distributed water storage chambers, designated as water chamber #1, water chamber #2, water chamber #3, and water chamber #4. The water tank is equipped with an inlet pipe system and an outlet pipe system. The water outlet pipe system includes a main outlet pipe, which is U-shaped and passes through water chambers #1, #2, #3, and #4. The main outlet pipe has four branch outlet pipes, each connected to one of the four water chambers. Each branch outlet pipe has a valve positioned in the direction of its outlet flow. The water inlet pipe system includes a main inlet pipe, which is U-shaped and passes through water chambers #1, #2, #3, and #4. The main inlet pipe has four branch inlet pipes, each connected to one of the four water chambers. Each branch inlet pipe has a valve positioned in the direction of its outlet flow.

[0006] Preferably, the water storage cavity has a rectangular cross-section, and the inlet branch pipe and outlet branch pipe are distributed along the diagonal direction of the water storage cavity.

[0007] Preferably, a water treatment tower is provided at the inlet end of the water inlet header, and the water treatment tower is provided with at least 4 stages of adsorption filtration layers.

[0008] Preferably, the four-stage adsorption filtration layer includes, in sequence, a first sand and gravel filtration layer, an activated carbon adsorption layer, a zeolite filtration layer, and a second sand and gravel filtration layer.

[0009] Preferably, the hydrogen utilization equipment includes at least one of a hydrogen fuel cell, a hydrogen fuel cell vehicle, and a hydrogen welding machine.

[0010] Preferably, the oxygen utilization equipment includes at least one of an oxygen welding machine and an aquaculture aerator.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] This utility model provides an off-grid photovoltaic electrolysis water production hydrogen production coupling control system. By employing four interconnected water storage chambers, water can be sequentially supplied to the electrolyzer from chamber #1 to chamber #4 through the outlet water pipe system. This not only ensures the timely supply of water but also allows sufficient time for the water treatment tower to process the water. Furthermore, it helps reduce the amount of residual water in the outlet header during a complete supply cycle. The system is rationally designed, facilitates water replenishment and water treatment, and helps ensure the performance of the electrolysis hydrogen production system as well as the utilization rate of hydrogen and oxygen. It is suitable for large-scale promotion. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of an off-grid photovoltaic electrolysis water production hydrogen production coupling control system provided for an embodiment;

[0015] Figure 2 A schematic diagram of the water tank, inlet pipe system, outlet pipe system, and water treatment tower provided for the embodiment;

[0016] In the above figures:

[0017] 1. Solar power generation system; 2. Energy storage system; 3. Coupling control device; 4. Hydrogen production device; 41. Electrolyzer; 42. Water tank; 421. Water chamber #1; 422. Water chamber #2; 423. Water chamber #3; 424. Water chamber #4; 43. Gas storage equipment; 44. Hydrogen utilization equipment; 45. Oxygen utilization equipment; 46. Inlet water pipe system; 461. Inlet main pipe; 462. Inlet branch pipe; 463. Inlet valve; 47. Outlet water pipe system; 471. Outlet main pipe; 472. Outlet branch pipe; 473. Outlet valve; 5. Water treatment tower. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0020] Examples, such as Figure 1 and Figure 2 As shown, this utility model provides an off-grid photovoltaic electrolysis water production hydrogen production coupling control system, including a solar power generation system 1, an energy storage system 2, a coupling control device 3, and a hydrogen production device 4. The hydrogen production device 4 includes an electrolyzer 41, with a water tank 42 and a gas storage device 43 respectively installed at the supply and output ends of the electrolyzer 41. A hydrogen utilization device 44 and an oxygen utilization device 45 are installed on the output side of the gas storage device 43. The solar power generation system 1 includes photovoltaic modules, an inverter, and a photovoltaic grid-connected cabinet, while the energy storage system 2 includes a battery and an energy storage inverter. The solar power generation system 1 utilizes solar energy to generate electricity, which can be connected to the power grid and provide the necessary power for water electrolysis. The coupling control device 3 is used to regulate the voltage and frequency in the power grid, maintain the stability of the power system, and ensure stability and safety during grid connection. When a disturbance occurs in the power grid, the coupling control device 3 can respond quickly by adjusting the coupled energy or signal to restore the power grid to normal operation. The gas storage device 43 includes at least a hydrogen tank and an oxygen tank for storing hydrogen and oxygen respectively, and the hydrogen tank can be supplied to the hydrogen utilization device 44, and the oxygen tank can be supplied to the oxygen utilization device 45, thereby improving the utilization rate of the products generated by water electrolysis.

[0021] To improve the continuous operating performance of the electrolytic cell 41, the water tank 42 provided by this utility model includes four 2×2 distributed water storage chambers, namely water chamber 1#421, water chamber 2#422, water chamber 3#423, and water chamber 4#424. A water pump is installed at the power end of the water tank 42, and a water level alarm device is installed on the inner wall of each of the four water storage chambers to provide water level warning information to the control end of the system. The water tank 42 is provided with an inlet pipe system 46 and an outlet pipe system 47. The outlet pipe system 47 includes an outlet header pipe 471, which is U-shaped and passes through water chambers 1#421, 2#422, 3#423, and 4#424. Pipe 471 is provided with four outlet branch pipes 472 that are respectively connected to water chamber 1# 421, water chamber 2# 422, water chamber 3# 423 and water chamber 4# 424. An outlet valve 473 is provided in the outlet direction of the outlet branch pipe 472. The water inlet pipe system 46 includes an inlet main pipe 461. The inlet main pipe 461 is U-shaped and passes through water chamber 1# 421, water chamber 2# 422, water chamber 3# 423 and water chamber 4# 424. The inlet main pipe 461 is provided with four inlet branch pipes 462 that are respectively connected to water chamber 1# 421, water chamber 2# 422, water chamber 3# 423 and water chamber 4# 424. An inlet valve is provided in the outlet direction of the inlet branch pipe 462. This invention employs four interconnected water storage chambers, allowing water to be supplied sequentially from water chamber 1 (421) to water chamber 424 (424) to the electrolytic cell 41 via water outlet pipe system 47. Before the water in one of the chambers is nearly depleted, a water level alarm device sends a real-time water level report to the control system, which then opens the downstream water outlet valve 473. When the water in that chamber reaches its limit, it helps ensure the timely supply of the required medium to the electrolytic cell 41.

[0022] Furthermore, if different water chambers in water tank 42 are opened sequentially for water supply, the water pumped later can continue to pump the water remaining in the water pipe in the front section into the electrolytic cell 41, which helps to reduce the water quality residue in the outlet header 471 during a complete supply cycle. In the emptied water chamber, water is replenished in an orderly manner through the water inlet relationship, which allows sufficient time for the water treatment tower to treat the water quality. The design is reasonable, facilitates water supply and water quality treatment, and helps to ensure the performance of the electrolytic hydrogen production of this system.

[0023] To improve the utilization rate of the water tank 42, the water storage cavity provided by this invention has a rectangular cross-section. The four quadrangular prism-shaped water cavities can fully utilize the overall volume of the water tank 42. Furthermore, considering the overall pipeline design, this invention distributes the inlet branch pipe 462 and the outlet branch pipe 472 diagonally along the water storage cavity. Specifically, the outlet branch pipe 472 is positioned closer to the water usage direction of the electrolytic cell 41, while the inlet branch pipe 462 is positioned closer to the supply side of the water treatment tower towards the inlet pipe system 46. This ensures the independence of the inlet and outlet water flow and facilitates real-time monitoring of the inlet and outlet water positions.

[0024] To improve the water quality entering the electrolyzed water, the inlet end of the inlet header 461 provided by this invention is equipped with a water treatment tower 5, and the interior of the water treatment tower 5 is equipped with at least four stages of adsorption filtration layers. Further, the four stages of adsorption filtration layers sequentially include a first sand and gravel filtration layer, an activated carbon adsorption layer, a zeolite filtration layer, and a second sand and gravel filtration layer. The sand and gravel particles in the first sand and gravel filtration layer are larger than those in the second sand and gravel filtration layer. The first and second sand and gravel filtration layers utilize the gaps between the sand and gravel particles and the gravity of the water flow to filter physical impurities carried by the water. The activated carbon adsorption layer has a strong adsorption capacity for organic matter, pigments, and odors, and can remove pigments and organic matter from the water. Zeolite has a large specific surface area and a unique pore structure, and has good adsorption performance for organic matter in the water. Zeolite can remove heavy metal ions from the water through ion exchange and adsorption, thereby expanding the sources of water supply, improving water utilization, and ensuring the quality of water supplied to the electrolyzer 41. The water treatment tower, through multi-stage filtration and adsorption, can ensure the quality of the water supplied to the electrolyzer 41, and make full use of the time interval between the outlet pipe system 47 switching to different water chambers to complete the water treatment.

[0025] To improve the utilization rate of hydrogen, the hydrogen utilization device 44 provided by this utility model includes at least one of a hydrogen fuel cell, a hydrogen fuel cell vehicle, and a hydrogen welding machine. The hydrogen tank of the gas storage device 43 can be replaced promptly when its capacity reaches the rated capacity. Utilizing the hydrogen tank as a safe and portable gas source can be effectively applied to the corresponding hydrogen utilization device 44.

[0026] To improve oxygen utilization, the oxygen utilization device 45 provided by this invention includes at least an oxygen welding machine and an aquaculture aerator. The aquaculture aerator increases the oxygen content of the water in the aquaculture pond by inputting oxygen, which is beneficial to the growth and reproduction of the corresponding aquatic organisms. The oxygen tank in the gas storage device 43 can be replaced promptly when its capacity reaches the rated capacity. Using the oxygen tank as a safe and portable gas source can be effectively applied to the corresponding oxygen utilization device 45.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An off-grid photovoltaic water electrolysis hydrogen production coupling control system, comprising a solar power generation system, an energy storage system, a coupling control device and a hydrogen production device, the hydrogen production device comprising an electrolytic cell, a water tank and a gas storage device being arranged at the supply end and the output end of the electrolytic cell respectively, and a hydrogen utilization device being arranged at the output side of the gas storage device, characterized in that, The gas storage device is also equipped with an oxygen utilization device on its output side. The water tank includes four 2×2 distributed water storage chambers, designated as chamber 1, chamber 2, chamber 3, and chamber 4. The water tank is equipped with an inlet pipe system and an outlet pipe system. The outlet pipe system includes an outlet header pipe, which is U-shaped and passes through chambers 1, 2, 3, and 4. The outlet header pipe has four terminals connecting to chambers 1, 2, 3, and 4. The system includes a main inlet pipe that is U-shaped and passes through water chambers 1, 2, 3, and 4. Four branch inlet pipes are connected to water chambers 1, 2, 3, and 4 respectively. Each branch inlet pipe has a valve positioned at the outlet direction.

2. The off-grid photovoltaic water electrolysis hydrogen production coupling control system according to claim 1, characterized in that, The water storage cavity has a rectangular cross-section, and the inlet branch pipe and outlet branch pipe are distributed along the diagonal direction of the water storage cavity.

3. The off-grid photovoltaic water electrolysis hydrogen production coupling control system according to claim 2, characterized in that, A water treatment tower is installed at the inlet end of the water inlet header, and the water treatment tower has at least four stages of adsorption filtration layers inside.

4. The off-grid photovoltaic water electrolysis hydrogen production coupling control system according to claim 3, characterized in that, The four-stage adsorption filtration layer includes, in sequence, a first sand and gravel filtration layer, an activated carbon adsorption layer, a zeolite filtration layer, and a second sand and gravel filtration layer.

5. The off-grid photovoltaic water electrolysis hydrogen production coupling control system according to claim 1, characterized in that, The hydrogen utilization equipment includes at least one of the following: a hydrogen fuel cell, a hydrogen fuel cell vehicle, and a hydrogen welding machine.

6. The off-grid photovoltaic water electrolysis hydrogen production coupling control system according to claim 1, characterized in that, The oxygen utilization equipment includes at least one of an oxygen welding machine and an aquaculture aerator.

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