A system for co-production of green hydrogen and organic chemicals by coupling open circuit flow battery with charging and discharging

Abstract

The utility model discloses a kind of open-circuit flow battery coupling charge-discharge co-production green hydrogen and organic chemical system, including the open-circuit flow battery coupling charging hydrogen production or organic chemical system and open-circuit flow battery coupling discharge hydrogen production or organic chemical system of a set of positive electrolyte liquid supply mechanism for sharing;Open-circuit flow battery coupling charging hydrogen production or organic chemical system includes power supply mechanism, charging negative electrolyte liquid supply mechanism and and at least one open-circuit flow battery coupling charging hydrogen production or organic chemical reactor;Open-circuit flow battery coupling discharge hydrogen production or organic chemical system includes energy storage mechanism, discharging negative electrolyte liquid supply mechanism and and at least one open-circuit flow battery coupling discharge hydrogen production or organic chemical reactor.The utility model realizes efficient energy storage and green synthesis of high-value chemicals;Reaction system is widely applicable, provides new ideas for absorbing and stabilizing green electricity fluctuation and organic chemical green synthesis field.

Description

Technical Field

[0001] This utility model belongs to the field of energy storage and organic chemical synthesis, specifically relating to an open-circuit flow battery coupled charge and discharge system for the co-production of green hydrogen and organic chemicals. Background Technology

[0002] Flow batteries, as a typical example of novel long-term energy storage, play an important role in absorbing and mitigating fluctuations in green electricity. However, their high energy storage cost restricts their large-scale application. Solving the high cost problem of flow batteries and achieving efficiency improvement and cost reduction is a current research hotspot and challenge. Currently, most methods for reducing the cost of flow batteries focus on electrolyte and stack costs. While some progress has been made, it has not yet met expectations and a breakthrough is unlikely in the short term. Therefore, seeking a new technology for cost reduction and efficiency improvement in flow batteries is urgently needed. In 2014, Professor Michael J. Aziz of Harvard University first proposed the aqueous organic flow battery (AOFB), using water-soluble organic compounds as the energy storage medium. This opened up new research avenues, replacing expensive inorganic ion reduction pairs with inexpensive organic molecules. Furthermore, electrocatalytic reactions and flow batteries share common redox mechanisms and similar structures (such as positive and negative electrodes, electrolytes, and separators). Based on this, the charging / discharging process of flow batteries is coupled with the electrocatalytic oxidation and reduction processes of organic matter, breaking through the traditional "closed-loop" electrolyte technology framework of flow batteries. This achieves efficient energy storage while also producing high-value-added chemicals, thereby reducing energy storage costs and increasing efficiency. However, this system has not yet been effectively studied, and how to design an efficient, simple, and universally applicable reaction system is a problem that needs to be researched and solved. Utility Model Content

[0003] This invention addresses the problems of high cost and low energy utilization in current electrochemical energy storage systems. Its purpose is to provide a system for co-producing green hydrogen and organic chemicals using an open-circuit flow battery coupled with charge and discharge.

[0004] This utility model is achieved through the following technical solution: An open-circuit flow battery coupled charge-discharge system for the co-production of green hydrogen and organic chemicals includes an open-circuit flow battery coupled charging system for producing hydrogen or organic chemicals and an open-circuit flow battery coupled discharging system for producing hydrogen or organic chemicals, both sharing a common positive electrode electrolyte supply mechanism. The open-circuit flow battery coupled charging system for producing hydrogen or organic chemicals includes a power supply mechanism, a charging negative electrode electrolyte supply mechanism, and at least one open-circuit flow battery coupled charging reactor for producing hydrogen or organic chemicals. The open-circuit flow battery coupled charging reactor for hydrogen production or organic chemical production includes a charging positive electrode, a charging negative electrode, and a charging membrane disposed between the two; the charging positive electrode and the charging negative electrode are arranged in a mirror-symmetric manner; The power supply mechanism includes a DC power supply electrically connected to an open-circuit flow battery coupled to charge a hydrogen production or organic chemical reactor. The charging negative electrode electrolyte supply mechanism includes a front charging negative electrode electrolyte storage device and a rear charging negative electrode electrolyte storage device. The front charging negative electrode electrolyte storage device is connected to the inlet of the charging negative electrode through a pipeline; the rear charging negative electrode electrolyte storage device is connected to the outlet of the charging negative electrode. The open-circuit flow battery coupled discharge hydrogen production or organic chemical production system includes an energy storage mechanism, a discharge negative electrode electrolyte supply mechanism, and at least one open-circuit flow battery coupled discharge hydrogen production or organic chemical production reactor. The energy storage mechanism includes a transformer electrically connected to an open-circuit flow battery coupled to discharge a hydrogen production or organic chemical reactor. The discharge negative electrode electrolyte supply mechanism includes a rear discharge negative electrode electrolyte storage device and at least one front discharge negative electrode electrolyte storage device; the rear discharge negative electrode electrolyte storage device is connected to the inlet of the discharge negative electrode; the front discharge negative electrode electrolyte storage device is connected to the outlet of the discharge negative electrode.

[0005] In the above technical solution, the charging positive electrode includes a charging positive end plate, a charging positive insulating plate, a charging positive current collector, a charging positive bipolar plate, a charging positive fluid flow frame, a charging positive pad, and a charging positive catalyst layer arranged in sequence; the charging negative electrode includes a charging negative end plate, a charging negative insulating plate, a charging negative current collector, a charging negative bipolar plate, a charging negative fluid flow frame, a charging negative pad, and a charging negative catalyst layer arranged in sequence.

[0006] In the above technical solution, the charging positive terminal plate, the charging positive terminal insulating plate, the charging negative terminal plate, and the charging negative terminal insulating plate are all rectangular plate structures with screw holes formed along the edges; the charging positive terminal plate, the charging positive terminal insulating plate, the charging negative terminal plate, and the charging negative terminal insulating plate are fastened together by bolts, and the remaining components of the charging positive and charging negative terminals, as well as the charging diaphragm, are pressed between the charging positive terminal plate and the charging negative terminal plate.

[0007] In the above technical solution, both the positive charging current collector and the negative charging current collector are rectangular plate structures, and one end forms a connecting strip; the connecting strip of the positive charging current collector is connected to the positive terminal of the DC power supply; the connecting strip of the negative charging current collector is connected to the negative terminal of the DC power supply.

[0008] In the above technical solution, the charging positive bipolar plate and the charging negative bipolar plate have the same structure, both being rectangular plate structures; a liquid flow channel field is formed on the side of the charging positive bipolar plate facing the charging positive catalyst layer and the side of the charging negative bipolar plate facing the charging negative catalyst layer. The liquid flow channel field is composed of multiple wavy liquid flow channels. Both the charging positive bipolar plate and the charging negative bipolar plate form liquid inlet channels and liquid outlet channels, which are diagonally distributed and connected to the liquid flow channel field; the shape and size of the liquid flow channel field match the shape and size of the corresponding charging positive catalyst layer or charging negative catalyst layer.

[0009] In the above technical solution, the charging positive electrode liquid flow frame and the charging negative electrode liquid flow frame have the same structure. They are both plate-shaped structures with a rectangular hole in the middle and flow channels are provided on both sides of the rectangular hole. The size of the rectangular hole matches the size of the liquid flow channel field.

[0010] In the above technical solution, both the positive and negative charging pads are plate-shaped structures with a rectangular hole in the middle, and the dimensions of the positive and negative charging pads are the same as the dimensions of the positive and negative charging flow frames; both the positive and negative charging catalyst layers are rectangular plate-shaped structures, and their dimensions are not larger than the dimensions of the rectangular holes in the positive and negative charging flow frames; the dimensions of the charging separator are not smaller than the dimensions of the positive and negative charging catalyst layers; the positive and negative charging catalyst layers are located on both sides of the charging separator.

[0011] In the above technical solution, the DC power supply is connected to the upstream energy source, and a charging circuit breaker is installed between the DC power supply and the upstream energy source; the transformer is electrically connected to the energy storage mechanism, and a discharge circuit breaker is installed between the two.

[0012] In the above technical solution, the structure of the open-circuit flow battery coupled with discharge to produce hydrogen or organic chemicals is the same as the structure of the open-circuit flow battery coupled with charging to produce hydrogen or organic chemicals reactor.

[0013] In the above technical solution, when the open-circuit flow battery coupled charging hydrogen production or organic chemical production system includes multiple open-circuit flow battery coupled charging hydrogen production or organic chemical production reactors, the multiple open-circuit flow battery coupled charging hydrogen production or organic chemical production reactors are connected in parallel or in series; when the open-circuit flow battery coupled discharging hydrogen production or organic chemical production system includes multiple open-circuit flow battery coupled discharging hydrogen production or organic chemical production reactors, the multiple open-circuit flow battery coupled discharging hydrogen production or organic chemical production reactors are connected in parallel or in series.

[0014] The beneficial effects of this utility model are: This invention provides a system for the co-production of green hydrogen and organic chemicals using an open-circuit flow battery coupled with charge and discharge. It constructs a revolutionary technology system of "flow battery and energy-mass coupling," breaking through the traditional "closed-loop circulation" technology framework of flow battery electrolytes. The system couples the electrocatalytic oxidation / reduction process for producing hydrogen and high-value chemicals with the charge and discharge process of the open-circuit flow battery, achieving efficient energy storage and green synthesis of high-value chemicals. The reaction system has wide applicability, providing a new approach for absorbing and mitigating fluctuations in green electricity and for the green synthesis of organic chemicals. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the open-circuit flow battery coupled charging reactor for hydrogen production or organic chemical production in this utility model; Figure 3 This is a schematic diagram of the structure of the open-circuit flow battery coupled discharge reactor for producing hydrogen or organic chemicals in this utility model; Figure 4 This is a schematic diagram of the structure of the charging positive bipolar plate, the charging negative bipolar plate, the discharging positive bipolar plate, and the discharging negative bipolar plate in this utility model. Figure 5 This is a schematic diagram of the structure of the charging positive electrode fluid flow frame, the charging negative electrode fluid flow frame, the discharging positive electrode fluid flow frame, and the discharging negative electrode fluid flow frame in this utility model; Figure 6 This is a constant current charging diagram of hydrogen production via open-circuit flow battery coupled charging under power drive in application example 1 of this utility model. Figure 7 This is a constant current discharge diagram of the open-circuit flow battery coupled discharge to produce glycolic acid in application example 1 of this utility model; Figure 8 This is a constant current charging diagram of open-circuit flow battery coupled charging for hydrogen production under power-driven conditions in Application Example 2 of this utility model. Figure 9 This is a constant current discharge diagram of acetic acid production by open-circuit flow battery coupling discharge in application example 2 of this utility model; Figure 10 These are product analysis diagrams from application examples 1 and 2 of this utility model.

[0016] in: 10. Open-circuit flow battery coupled with charging reactor for hydrogen production or organic chemical production. 101. Positive charging terminal; 1011. Positive charging electrode plate; 1012. Positive charging electrode insulating plate; 1013. Positive charging electrode current collector; 1014. Positive charging electrode bipolar plate; 1015. Positive charging electrode fluid flow frame; 1016. Positive charging electrode gasket; 1017. Positive charging electrode catalyst layer; 102. Negative terminal of the charger; 1021. Charging negative electrode plate; 1022. Charging negative electrode insulating plate; 1023. Charging negative electrode current collector; 1024. Charging negative electrode bipolar plate; 1025. Charging negative electrode fluid flow frame; 1026. Charging negative electrode gasket; 1027. Charging negative electrode catalyst layer; 103. Charging diaphragm; 11. DC power supply; 12. Energy supplied by higher authorities; 13. Charging circuit breaker; 14. Hydrogen gas collection device; 15. Pre-charged negative electrode electrolyte storage solution; 16. Post-charge negative electrode electrolyte storage 20. Open-circuit flow battery coupled discharge reactor for hydrogen production or organic chemical production. 201. Discharge positive electrode; 2011, Discharge positive electrode plate; 2012, Discharge positive electrode insulating plate; 2013, Discharge positive electrode current collector; 2014, Discharge positive electrode bipolar plate; 2015, Discharge positive electrode liquid flow frame; 2016, Discharge positive electrode gasket; 2017, Discharge positive electrode catalyst layer; 202. Discharge negative electrode; 2021, Discharge negative electrode plate; 2022, Discharge negative electrode insulating plate; 2023, Discharge negative electrode current collector; 2024, Discharge negative electrode bipolar plate; 2025, Discharge negative electrode liquid flow frame; 2026, Discharge negative electrode gasket; 2027, Discharge negative electrode catalyst layer; 203. Discharge diaphragm; 21. Transformer; 22. Energy storage institutions; 23. Discharge circuit breaker; 24. Post-discharge negative electrode electrolyte storage device; 25. Pre-discharge negative electrode electrolyte storage device; 30. Positive electrolyte storage device.

[0017] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] like Figures 1-5As shown, an open-circuit flow battery coupled charge and discharge system for producing green hydrogen and organic chemicals includes an open-circuit flow battery coupled charging system for producing hydrogen or organic chemicals and an open-circuit flow battery coupled discharging system for producing hydrogen or organic chemicals, both sharing a common positive electrode electrolyte supply mechanism. The open-circuit flow battery coupled charging hydrogen production or organic chemical production system includes a power supply mechanism, a charging negative electrode electrolyte supply mechanism, and at least one open-circuit flow battery coupled charging hydrogen production or organic chemical production reactor 10. The open-circuit flow battery coupled charging hydrogen production or organic chemical reactor 10 includes a charging positive electrode 101, a charging negative electrode 102, and a charging membrane 103 disposed between the two; the charging positive electrode 101 and the charging negative electrode 102 are arranged in a mirror symmetrical manner; The charging positive electrode 101 includes a charging positive electrode plate 1011, a charging positive electrode insulating plate 1012, a charging positive electrode current collector 1013, a charging positive electrode bipolar plate 1014, a charging positive electrode liquid flow frame 1015, a charging positive electrode pad 1016, and a charging positive electrode catalyst layer 1017 arranged sequentially. The charging negative electrode 102 includes a charging negative electrode end plate 1021, a charging negative electrode insulating plate 1022, a charging negative electrode current collector 1023, a charging negative electrode bipolar plate 1024, a charging negative electrode liquid flow frame 1025, a charging negative electrode pad 1026, and a charging negative electrode catalyst layer 1027 arranged sequentially. The positive charging terminal plate 1011, the positive charging terminal insulating plate 1012, the negative charging terminal plate 1021, and the negative charging terminal insulating plate 1022 are all rectangular plate structures with screw holes formed along the edges. The positive charging terminal plate 1011, the positive charging terminal insulating plate 1012, the negative charging terminal plate 1021, and the negative charging terminal insulating plate 1022 are fastened together by bolts, and the remaining components of the positive charging terminal 101 and the negative charging terminal 102, as well as the charging diaphragm 103, are pressed between the positive charging terminal plate 1011 and the negative charging terminal plate 1021. Both the positive charging current collector 1013 and the negative charging current collector 1023 are rectangular plate structures, with a wiring protrusion at one end; the protrusion of the positive charging current collector 1013 is connected to the positive terminal of the DC power supply 11; the protrusion of the negative charging current collector 1023 is connected to the negative terminal of the DC power supply 11. The charging positive bipolar plate 1014 and the charging negative bipolar plate 1024 have the same structure, both being rectangular plate structures. A liquid flow channel field is formed on the side of the charging positive bipolar plate 1014 facing the charging positive catalyst layer 1017 and on the side of the charging negative bipolar plate 1024 facing the charging negative catalyst layer 1027. The liquid flow channel field is composed of multiple wavy liquid flow channels. Both the charging positive bipolar plate 1014 and the charging negative bipolar plate 1024 form inlet and outlet channels, which are diagonally distributed and connected to the liquid flow channel field. The shape and size of the liquid flow channel field correspond to the shape and size of the corresponding charging positive catalyst layer 1017 or charging negative catalyst layer 1027. The positive charging flow frame 1015 and the negative charging flow frame 1025 have the same structure, both being plate-shaped structures with a rectangular hole in the middle; the size of the rectangular hole matches the size of the liquid flow channel field of the positive charging bipolar plate 1014 or the negative charging bipolar plate 1024. The charging positive electrode liquid flow frame 1015 and the charging negative electrode liquid flow frame 1025 have the same structure. They are both plate-shaped structures with a rectangular hole in the middle. The size of the rectangular hole matches the size of the liquid flow field. Multiple flow channels are provided on the side walls on both sides of the rectangular hole. Inlet and outlet channels are formed on both the charging positive electrode liquid flow frame 1015 and the charging negative electrode liquid flow frame 1025. One end of the flow channel is connected to the inlet or outlet channel, and the other end is connected to the rectangular hole. The multi-channel design allows the electrolyte to flow into the reaction zone evenly. Covers are provided on the flow channel areas on both sides of the charging positive electrode flow frame 1015 and the charging negative electrode flow frame 1025. The positive charging plate 1011, the positive charging insulating plate 1012, the positive charging current collector 1013, the positive charging bipolar plate 1014, and the positive charging liquid flow frame 1015 all have interconnected liquid inlets and outlets, and the liquid inlets and outlets are respectively connected to the liquid flow channels of the liquid flow field of the positive charging bipolar plate 1014. The charging negative electrode plate 1021, charging negative electrode insulating plate 1022, charging negative electrode current collector 1023, charging negative electrode bipolar plate 1024 and charging negative electrode liquid flow frame 1025 are all interconnected with liquid inlet and liquid outlet. The liquid inlet and liquid outlet are respectively connected to the liquid flow channel and liquid outlet of the liquid flow field of the charging negative electrode bipolar plate 1024. After the gas enters the post-charging negative electrode electrolyte storage 16 synchronously, it enters the hydrogen gas collection device 14 from the gas outlet of the post-charging negative electrode electrolyte storage 16. The positive charging pad 1016 and the negative charging pad 1026 are both plate-shaped structures with a rectangular hole in the middle, and the dimensions of the positive charging pad 1016 and the negative charging pad 1026 are the same as the dimensions of the positive charging liquid flow frame 1015 and the negative charging liquid flow frame 1025. Both the charging positive electrode catalyst layer 1017 and the charging negative electrode catalyst layer 1027 are rectangular plate structures, and their size is not larger than the size of the rectangular holes of the charging positive electrode liquid flow frame 1015 and the charging negative electrode liquid flow frame 1025, to ensure that the catalyst is in full contact with the liquid flow field. The size of the charging separator 103 is not smaller than the size of the charging positive catalyst layer 1017 and the charging negative catalyst layer 1027, to ensure that the charging positive catalyst layer 1017 and the charging negative catalyst layer 1027 are fully isolated; the charging positive catalyst layer 1017 and the charging negative catalyst layer 1027 are located on both sides of the charging separator 103 respectively. The power supply mechanism includes a DC power supply 11 that is electrically connected to the open-circuit flow battery coupled to charge hydrogen production or organic chemical reactor 10. The DC power supply 11 is connected to the upstream power supply 12, and a charging circuit breaker 13 is provided between the DC power supply 11 and the upstream power supply 12. The charging negative electrode electrolyte supply mechanism includes a pre-charging negative electrode electrolyte storage 15 and a post-charging negative electrode electrolyte storage 16. The pre-charging negative electrode electrolyte storage 15 is connected to the inlet of the charging negative electrode through a pipeline, and a pump and a valve are installed on the pipeline. The post-charging negative electrode electrolyte storage 16 is connected to the outlet of the charging negative electrode. The pre-charging negative electrode electrolyte storage 15 and the post-charging negative electrode electrolyte storage 16 are connected by a pipeline, and a valve is installed on the pipeline. The open-circuit flow battery coupled charging hydrogen or organic chemical production system also includes a hydrogen collection device 14, which is connected to the outlet of the post-charge negative electrode electrolyte storage 16. When the open-circuit flow battery coupled charging hydrogen production or organic chemical production system includes multiple open-circuit flow battery coupled charging hydrogen production or organic chemical production reactors 10, the multiple open-circuit flow battery coupled charging hydrogen production or organic chemical production reactors 10 are connected in parallel or in series. When multiple open-circuit flow batteries are coupled and charged to produce hydrogen or organic chemicals 10 in series or in parallel, the inlet of the charging negative electrode is connected to the main pipeline through its respective branch pipeline, and then connected to the front charging negative electrode electrolyte storage 15. The outlet of the charging negative electrode is connected to the main pipeline through its respective branch pipeline, and then connected to the rear charging negative electrode electrolyte storage 16. The inlet and outlet of the charging positive electrode are also connected to the positive electrode electrolyte supply mechanism through pipelines. The open-circuit flow battery coupled discharge hydrogen production or organic chemical production system includes an energy storage mechanism, a discharge negative electrode electrolyte supply mechanism, and at least one open-circuit flow battery coupled discharge hydrogen production or organic chemical production reactor 20. The energy storage mechanism includes a transformer 21, which is electrically connected to the energy storage mechanism 22, and a discharge circuit breaker 23 is provided between the two; the transformer 21 is electrically connected to the open-circuit flow battery coupled discharge hydrogen production or organic chemical reactor 20. The structure of the open-circuit flow battery coupled discharge hydrogen production or organic chemical production reactor 20 is the same as that of the open-circuit flow battery coupled discharge hydrogen production or organic chemical production reactor 10.

[0020] The open-circuit flow battery coupled discharge reactor 20 for producing hydrogen or organic chemicals includes a positive discharge electrode 201, a negative discharge electrode 202, and a discharge membrane 203 disposed between the two; the positive discharge electrode 201 and the negative discharge electrode 202 are arranged in a mirror symmetrical manner. The discharge positive electrode 201 includes a discharge positive electrode plate 2011, a discharge positive electrode insulating plate 2012, a discharge positive electrode current collector 2013, a discharge positive electrode bipolar plate 2014, a discharge positive electrode liquid flow frame 2015, a discharge positive electrode gasket 2016, and a discharge positive electrode catalyst layer 2017 arranged sequentially. The discharge negative electrode 202 includes a discharge negative electrode end plate 2021, a discharge negative electrode insulating plate 2022, a discharge negative electrode current collector 2023, a discharge negative electrode bipolar plate 2024, a discharge negative electrode liquid flow frame 2025, a discharge negative electrode gasket 2026, and a discharge negative electrode catalyst layer 2027 arranged sequentially. The discharge positive terminal plate 2011, discharge positive terminal insulating plate 2012, discharge negative terminal plate 2021 and discharge negative terminal insulating plate 2022 are all rectangular plate structures with screw holes formed along the edges; the discharge positive terminal plate 2011, discharge positive terminal insulating plate 2012, discharge negative terminal plate 2021 and discharge negative terminal insulating plate 2022 are fastened together by bolts, and the remaining components of the discharge positive electrode 201 and discharge negative electrode 202, as well as the discharge diaphragm 203, are pressed between the discharge positive terminal insulating plate 2012 and the discharge negative terminal plate 2021; Both the positive discharge current collector 2013 and the negative discharge current collector 2023 are rectangular plate structures, with a wiring protrusion at one end; the protrusion of the positive discharge current collector 2013 is connected to the positive terminal of the transformer 21; the protrusion of the negative discharge current collector 2023 is connected to the negative terminal of the transformer 21. The discharge positive electrode bipolar plate 2014 and the discharge negative electrode bipolar plate 2024 have the same structure, both being rectangular plate structures. A liquid flow channel field is formed on the side of the discharge positive electrode bipolar plate 2014 facing the discharge positive electrode catalyst layer 2017 and on the side of the discharge negative electrode bipolar plate 2024 facing the discharge negative electrode catalyst layer 2027. The liquid flow channel field consists of multiple wavy liquid flow channels. Both the discharge positive electrode bipolar plate 2014 and the discharge negative electrode bipolar plate 2024 form inlet and outlet channels, which are diagonally distributed and connected to the liquid flow channel field. The shape and size of the liquid flow channel field correspond to the shape and size of the corresponding discharge positive electrode catalyst layer 2017 or discharge negative electrode catalyst layer 2027. The discharge positive electrode liquid flow frame 2015 and the discharge negative electrode liquid flow frame 2025 have the same structure, both being plate-shaped structures with a rectangular hole in the middle; the size of the rectangular hole matches the size of the liquid flow field; multiple flow channels are provided on the side walls on both sides of the rectangular hole; both the discharge positive electrode liquid flow frame 2015 and the discharge negative electrode liquid flow frame 2025 have inlet and outlet channels; one end of the flow channel is connected to the inlet or outlet channel, and the other end is connected to the rectangular hole. The multi-channel design allows the electrolyte to flow evenly into the reaction zone. Covers are provided on the flow channel areas on both sides of the discharge positive electrode flow frame 2015 and the discharge negative electrode flow frame 2025. The discharge positive electrode plate 2011, discharge positive electrode insulating plate 2012, discharge positive electrode current collector 2013, discharge positive electrode bipolar plate 2014 and discharge positive electrode liquid flow frame 2015 are all formed with interconnected liquid inlets and liquid outlets, and the liquid inlets and liquid outlets are respectively connected to the liquid flow channel and liquid outlet of the liquid flow field of the discharge positive electrode bipolar plate 2014; The discharge negative electrode plate 2021, discharge negative electrode insulating plate 2022, discharge negative electrode current collector 2023, discharge negative electrode bipolar plate 2024 and discharge negative electrode liquid flow frame 2025 are all formed with interconnected liquid inlets and liquid outlets, and the liquid inlets and liquid outlets are respectively connected to the liquid flow channel and liquid outlet of the liquid flow field of the discharge negative electrode bipolar plate 2024; The positive discharge electrode pad 2016 and the negative discharge electrode pad 2026 are both plate-shaped structures with a rectangular hole formed in the middle, and the dimensions of the positive discharge electrode pad 2016 and the negative discharge electrode pad 2026 are the same as the dimensions of the positive discharge electrode liquid flow frame 2015 and the negative discharge electrode liquid flow frame 2025. Both the positive discharge catalyst layer 2017 and the negative discharge catalyst layer 2027 are rectangular plate structures, and their size is not larger than the size of the rectangular holes of the positive discharge liquid flow frame 2015 and the negative discharge liquid flow frame 2025, to ensure that the catalyst is in full contact with the liquid flow field. The size of the discharge diaphragm 203 is not smaller than the size of the discharge positive electrode catalyst layer 2017 and the discharge negative electrode catalyst layer 2027, to ensure sufficient isolation between the discharge positive electrode catalyst layer 2017 and the discharge negative electrode catalyst layer 2027. The negative electrode electrolyte supply mechanism includes a post-discharge negative electrode electrolyte storage device 24 and at least one pre-discharge negative electrode electrolyte storage device 25. When multiple pre-discharge negative electrode electrolyte storage devices 25 are provided, the multiple pre-discharge negative electrode electrolyte storage devices 25 are connected in parallel. The post-discharge negative electrode electrolyte storage device 24 and the pre-discharge negative electrode electrolyte storage device 25 are connected through a pipeline. The post-discharge negative electrode electrolyte storage device 24 is connected to the inlet of the negative electrode, and a pump and valve are provided on the connecting pipeline. The pre-discharge negative electrode electrolyte storage device 25 is connected to the outlet of the negative electrode. When the open-circuit flow battery coupled discharge hydrogen production or organic chemical production system includes multiple open-circuit flow battery coupled discharge hydrogen production or organic chemical production reactors 20, the multiple open-circuit flow battery coupled discharge hydrogen production or organic chemical production reactors 20 are connected in parallel or in series. When multiple open-circuit flow batteries are coupled and discharged to produce hydrogen or organic chemicals in parallel, the inlet of the discharge negative electrode is connected to the main pipeline through its respective branch pipeline, and then connected to the front discharge negative electrode electrolyte storage 25. The outlet of the discharge negative electrode is connected to the main pipeline through its respective branch pipeline, and then connected to the rear discharge negative electrode electrolyte storage 24. The inlet and outlet of the discharge positive electrode are also connected to the positive electrode electrolyte supply mechanism through pipelines. The positive electrolyte supply mechanism includes a positive electrolyte storage 30, which is connected to the inlet and outlet of the charging negative electrode 102 and the inlet and outlet of the discharging positive electrode 201.

[0021] The principle of this utility model: The power supply unit supplies power to the charging module, which consists of the positive and negative electrodes. At this time, the low-valence ions in the electrolyte of the positive electrode are oxidized into high-valence ions, and the negative electrode undergoes a reduction reaction, producing hydrogen or organic chemicals.

[0022] The discharge module, composed of the negative and positive electrodes, stores electrical energy or supplies power to the power supply system through the power output mechanism. At this time, the charging positive electrode electrolyte, which is oxidized into high-valence ions, is reduced into low-valence ions, and the negative electrode undergoes an oxidation reaction, producing hydrogen or organic chemicals.

[0023] Application Example 1 A reaction system for co-producing green hydrogen and organic chemicals using an open-circuit flow battery coupled with charge and discharge: The positive electrode for charging uses a graphite felt electrode, and the electrolyte for the positive electrode contains VO. 2+The electrolyte for the ions is as follows: the charging negative electrode uses a Pt-loaded graphite felt electrode, and the electrolyte for the charging negative electrode is a 4 M sulfuric acid solution; a Nafion 117 membrane is placed between the charging positive and negative electrodes; the discharging positive electrode uses a graphite felt electrode, and the electrolyte for the discharging positive electrode is VO2. + The electrolyte for ions is a nickel foam electrode loaded with gold-palladium alloy, and the electrolyte for the negative discharge electrode is a potassium hydroxide solution containing ethylene glycol organic substrate. A flow battery coupled with discharge can be used as a discharge reactor for hydrogen production or organic chemical production. Alternatively, a flow battery coupled with discharge can be used as a discharge reactor for hydrogen production or organic chemical production. A flow battery coupled with discharge can be used as a discharge reactor for hydrogen production or organic chemical production. This can be achieved by using a Pt electrocatalyst-supported graphite felt conductive substrate as the charging negative electrode and graphite felt as the charging positive electrode.

[0024] Power is supplied to an open-circuit flow battery coupled with a charging reactor for hydrogen production or organic chemicals, driven by the power supply at 100 mA cm⁻¹. –2 Constant current charging is performed, and the charging curve is as follows: Figure 6 As shown, the charging voltage is approximately 1.2V, and the battery charging capacity is approximately 38 AhL. -1 VO charging positive electrode 2+ Ions oxidized to VO2 + Furthermore, the negative electrode contains a sulfuric acid electrolyte that undergoes a reduction hydrogen evolution reaction. At the end of charging, the open-circuit flow battery is coupled with a discharge to produce hydrogen or an organic chemical reactor at 100 mA cm⁻¹. –2 A constant current is supplied to the energy storage mechanism, and the discharge curve is as follows: Figure 7 As shown, the discharge voltage reaches 1.3V, and the battery discharge capacity is approximately 40 Ah L. -1 Discharge positive electrode VO2 + Ions reduced to VO 2+ Furthermore, the negative electrode contains an electrolyte containing ethylene glycol, which undergoes an oxidation reaction to produce glycolic acid. Product analysis is as follows: Figure 8 As shown, the ethylene glycol electrocatalytic performance in this system is excellent, and the yield of glycolic acid reaches 0.84 mmol / cm². –2 h –1 Furthermore, both selectivity and Faraday efficiency remain around 90%.

[0025] Application Example 2 A reaction system for co-producing green hydrogen and organic chemicals using an open-circuit flow battery coupled with charge and discharge: The positive electrode for charging uses a graphite felt electrode, and the electrolyte for the positive electrode contains VO. 2+The electrolyte for the ions is as follows: the charging negative electrode uses a Pt-loaded graphite felt electrode, and the electrolyte for the charging negative electrode is a 4 M sulfuric acid solution; a Nafion 117 membrane is placed between the charging positive and negative electrodes; the discharging positive electrode uses a graphite felt electrode, and the electrolyte for the discharging positive electrode is VO2. + The electrolyte for ions is a nickel foam electrode loaded with nickel hydroxide, and the electrolyte for the negative discharge electrode is a potassium hydroxide solution containing ethanol organic substrate. A flow battery coupled with discharge can be used as a discharge reactor for hydrogen production or organic chemical production. Alternatively, a flow battery coupled with discharge can be used as a discharge reactor for hydrogen production or organic chemical production. A flow battery coupled with discharge can be used as a discharge reactor for hydrogen production or organic chemical production. This can be achieved by using a conductive graphite felt substrate supported on a Pt electrocatalyst as the charging negative electrode and graphite felt as the charging positive electrode.

[0026] Power is supplied to an open-circuit flow battery coupled with a charging reactor for hydrogen production or organic chemicals, driven by the power supply at 60 mA cm⁻¹. –2 Constant current charging is performed, and the charging curve is as follows: Figure 9 As shown, the charging voltage required is approximately 1.1V, and the battery charging capacity is approximately 38Ah / L. -1 VO charging positive electrode 2+ Ions oxidized to VO2 + Furthermore, the negative electrode contains a sulfuric acid electrolyte that undergoes a reduction hydrogen evolution reaction. At the end of charging, the open-circuit flow battery is coupled with a discharge to produce hydrogen or an organic chemical reactor at 60 mA cm⁻¹. –2 A constant current is supplied to the energy storage mechanism, and the discharge curve is as follows: Figure 10 As shown, the discharge voltage reaches 0.6 V, and the battery discharge capacity is approximately 40 Ah L. -1 Discharge positive electrode VO2 + Ions reduced to VO 2+ Furthermore, the negative electrode contains an electrolyte containing ethylene glycol, which undergoes an oxidation reaction to produce glycolic acid. Product analysis is as follows: Figure 9 As shown, the ethylene glycol electrocatalytic performance in this system is excellent, and the yield of glycolic acid reaches 0.45 mmol / cm². –2 h –1 Furthermore, both selectivity and Faraday efficiency remain around 80%.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A system for co-producing green hydrogen and organic chemicals using an open-circuit flow battery coupled with charge and discharge, characterized in that: The system includes an open-circuit flow battery coupled charging system for producing hydrogen or organic chemicals and an open-circuit flow battery coupled discharging system for producing hydrogen or organic chemicals, both sharing a common positive electrode electrolyte supply mechanism. The open-circuit flow battery coupled charging system for producing hydrogen or organic chemicals includes a power supply mechanism, a charging negative electrode electrolyte supply mechanism, and at least one open-circuit flow battery coupled charging reactor (10) for producing hydrogen or organic chemicals. The open-circuit flow battery coupled charging hydrogen production or organic chemical reactor (10) includes a charging positive electrode (101), a charging negative electrode (102), and a charging diaphragm (103) disposed between the two; the charging positive electrode (101) and the charging negative electrode (102) are arranged in a mirror symmetrical manner; The power supply mechanism includes a DC power supply (11) that is electrically connected to the open-circuit flow battery coupled to charge the hydrogen production or organic chemical reactor (10). The charging negative electrode electrolyte supply mechanism includes a front charging negative electrode electrolyte storage (15) and a rear charging negative electrode electrolyte storage (16). The front charging negative electrode electrolyte storage (15) is connected to the inlet of the charging negative electrode through a pipeline; the rear charging negative electrode electrolyte storage (16) is connected to the outlet of the charging negative electrode. The open-circuit flow battery coupled discharge hydrogen production or organic chemical production system includes an energy storage mechanism, a discharge negative electrode electrolyte supply mechanism, and at least one open-circuit flow battery coupled discharge hydrogen production or organic chemical production reactor (20). The energy storage mechanism includes a transformer (21) electrically connected to a reactor (20) coupled to an open-circuit flow battery for hydrogen production or organic chemical production. The discharge negative electrode electrolyte supply mechanism includes a post discharge negative electrode electrolyte storage device (24) and at least one pre discharge negative electrode electrolyte storage device (25); the post discharge negative electrode electrolyte storage device (24) is connected to the inlet of the discharge negative electrode; the pre discharge negative electrode electrolyte storage device (25) is connected to the outlet of the discharge negative electrode.

2. The open-circuit flow battery coupled charge-discharge co-production system for green hydrogen and organic chemicals according to claim 1, characterized in that: The positive charging electrode (101) includes a positive charging end plate (1011), a positive charging insulation plate (1012), a positive charging current collector (1013), a positive charging bipolar plate (1014), a positive charging fluid frame (1015), a positive charging pad (1016), and a positive charging catalyst layer (1017) arranged in sequence; the negative charging electrode (102) includes a negative charging end plate (1021), a negative charging insulation plate (1022), a negative charging current collector (1023), a negative charging bipolar plate (1024), a negative charging fluid frame (1025), a negative charging pad (1026), and a negative charging catalyst layer (1027) arranged in sequence.

3. The open-circuit flow battery coupled charge-discharge co-production system for green hydrogen and organic chemicals according to claim 2, characterized in that: The positive charging plate (1011), positive charging insulating plate (1012), negative charging plate (1021), and negative charging insulating plate (1022) are all rectangular plate structures with screw holes along the edges. The positive charging plate (1011), positive charging insulating plate (1012), negative charging plate (1021), and negative charging insulating plate (1022) are fastened together by bolts, and the remaining components of the positive charging plate (101) and negative charging plate (102) as well as the charging diaphragm (103) are pressed between the positive charging plate (1011) and the negative charging plate (1021).

4. The open-circuit flow battery coupled charge-discharge co-production system for green hydrogen and organic chemicals according to claim 2, characterized in that: Both the positive current collector (1013) and the negative current collector (1023) are rectangular plate structures, with a wiring protrusion at one end; the protrusion of the positive current collector (1013) is connected to the positive terminal of the DC power supply (11); the protrusion of the negative current collector (1023) is connected to the negative terminal of the DC power supply (11).

5. The open-circuit flow battery coupled charge-discharge co-production system for green hydrogen and organic chemicals according to claim 2, characterized in that: The charging positive bipolar plate (1014) and the charging negative bipolar plate (1024) have the same structure, both being rectangular plate structures. A liquid flow channel field is formed on the side of the charging positive bipolar plate (1014) facing the charging positive catalyst layer (1017) and on the side of the charging negative bipolar plate (1024) facing the charging negative catalyst layer (1027). The liquid flow channel field is composed of multiple wavy liquid flow channels. Both the charging positive bipolar plate (1014) and the charging negative bipolar plate (1024) form liquid inlet channels and liquid outlet channels. The liquid inlet channels and liquid outlet channels are diagonally distributed and are connected to the liquid flow channel field. The shape and size of the liquid flow channel field are matched with the shape and size of the corresponding charging positive catalyst layer (1017) or charging negative catalyst layer (1027).

6. The open-circuit flow battery coupled charge-discharge co-production system for green hydrogen and organic chemicals according to claim 2, characterized in that: The charging positive electrode liquid flow frame (1015) and the charging negative electrode liquid flow frame (1025) have the same structure. They are both plate-shaped structures with a rectangular hole in the middle and flow channels on both sides of the rectangular hole. The size of the rectangular hole matches the size of the liquid flow channel field.

7. The open-circuit flow battery coupled charge-discharge co-production system for green hydrogen and organic chemicals according to claim 2, characterized in that: The positive charging pad (1016) and negative charging pad (1026) are both plate-shaped structures with a rectangular hole in the middle, and the size of the positive charging pad (1016) and negative charging pad (1026) is the same as the size of the positive charging liquid flow frame (1015) and negative charging liquid flow frame (1025); the positive charging catalyst layer (1017) and negative charging catalyst layer (1027) are both rectangular plate-shaped structures, and their size is not greater than the size of the rectangular hole of the positive charging liquid flow frame (1015) and negative charging liquid flow frame (1025); the size of the charging diaphragm (103) is not less than the size of the positive charging catalyst layer (1017) and negative charging catalyst layer (1027); the positive charging catalyst layer (1017) and negative charging catalyst layer (1027) are located on both sides of the charging diaphragm (103).

8. The open-circuit flow battery coupled charge-discharge co-production system for green hydrogen and organic chemicals according to claim 1, characterized in that: The DC power supply (11) is connected to the upper-level energy supply (12), and a charging circuit breaker (13) is provided between the DC power supply (11) and the upper-level energy supply (12); the transformer (21) is electrically connected to the energy storage mechanism (22), and a discharge circuit breaker (23) is provided between the two.

9. The open-circuit flow battery coupled charge-discharge co-production system for green hydrogen and organic chemicals according to claim 1, characterized in that: The structure of the open-circuit flow battery coupled discharge hydrogen production or organic chemical production reactor (20) is the same as that of the open-circuit flow battery coupled charging hydrogen production or organic chemical production reactor (10).

10. The open-circuit flow battery coupled charge-discharge co-production system for green hydrogen and organic chemicals according to claim 1, characterized in that: When the open-circuit flow battery coupled charging hydrogen production or organic chemical production system includes multiple open-circuit flow battery coupled charging hydrogen production or organic chemical production reactors (10), the multiple open-circuit flow battery coupled charging hydrogen production or organic chemical production reactors (10) are connected in parallel or in series; when the open-circuit flow battery coupled discharging hydrogen production or organic chemical production system includes multiple open-circuit flow battery coupled discharging hydrogen production or organic chemical production reactors (20), the multiple open-circuit flow battery coupled discharging hydrogen production or organic chemical production reactors (20) are connected in parallel or in series.

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