Coupling system for electrolytic hydrogen production and solid hydrogen storage
By using a thermally conductive oil evaporator in the coupling system of electrolytic hydrogen production and solid hydrogen storage, the reaction heat generated during the magnesium-based hydrogen charging process is converted into high-temperature water vapor required for electrolytic hydrogen production by solid oxide, the problem of low energy utilization in the prior art is solved, and efficient energy management and heat recovery are achieved.
Patent Information
- Application Number
- CN202421936344.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-08-09
AI Technical Summary
There is a lack of a system in the prior art that couples solid oxide electrolytic cells and magnesium-based solid hydrogen storage structures, resulting in lower energy utilization.
A coupling system for electrolytic hydrogen production and solid hydrogen storage is designed. The reaction heat generated during magnesium-based hydrogen charging is converted into high-temperature water vapor required for electrolytic hydrogen production by solid oxide, so as to achieve the coupling of materials and thermal management between the hydrogen production system and the hydrogen charging system.
It significantly improves the energy utilization rate of the entire system, realizes heat recovery in the hydrogen charging process of the solid-state hydrogen storage system, and does not require external heat source supply, basically achieving the heat balance of the system.
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Figure CN222878110U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of hydrogen production and storage, and in particular to a coupling system of hydrogen production by electrolysis and solid-state hydrogen storage. Background Art
[0002] Green hydrogen refers to the production of hydrogen by using renewable energy (such as solar, wind, hydro or geothermal energy) to generate electricity and then using this green electricity to electrolyze water. This process does not directly produce greenhouse gas emissions and is therefore considered a truly zero-emission, clean energy carrier. The key technologies for the preparation of green hydrogen include the production of hydrogen by electrolysis of water and the storage and transportation of hydrogen. Among them, the solid oxide electrolyzer SOEC in the electrolysis of water hydrogen production technology usually has a higher energy conversion efficiency than traditional alkaline and proton exchange membrane (PEM) electrolyzers, but its application is limited because it needs to be heated to high temperatures. Magnesium-based solid hydrogen storage has attracted much attention due to its high hydrogen storage density and low cost advantages, but its application process has also been challenged by the high temperature required during the hydrogen charging and discharging process. At present, there is an urgent need to develop a system that couples a solid oxide electrolyzer and a magnesium-based solid hydrogen storage structure to achieve optimal energy configuration and further improve the energy utilization of the system. Utility Model Content
[0003] The purpose of this application is to provide a coupling system of hydrogen production by electrolysis and solid-state hydrogen storage, which to a certain extent solves the technical problem in the prior art of urgently needing to develop a system that couples a solid oxide electrolytic cell and a magnesium-based solid-state hydrogen storage structure, achieves optimal energy allocation, and further improves the energy utilization rate of the system.
[0004] The present application provides a coupled system of electrolytic hydrogen production and solid-state hydrogen storage, comprising: a solid oxide electrolysis device, a magnesium-based solid-state hydrogen storage device, a thermal oil evaporator, and a hydrogen compressor; wherein the solid oxide electrolysis device comprises a solid oxide electrolysis cell, a cathode-side high-temperature heat exchanger, a cathode-side low-temperature heat exchanger, and a gas-liquid separator;
[0005] The solid oxide electrolyzer, the cathode side high temperature heat exchanger and the cathode side low temperature heat exchanger are sequentially connected; the inlet and liquid phase outlet of the gas-liquid separator are respectively connected with the hot fluid outlet end of the cathode side low temperature heat exchanger and the cold fluid inlet end of the cathode side low temperature heat exchanger; the magnesium-based solid hydrogen storage device is formed with a chamber and a flow channel separated from each other, and a magnesium-based solid hydrogen storage material is arranged in the chamber, and heat transfer oil is arranged in the flow channel;
[0006] The gas phase outlet of the gas-liquid separator is connected to the chamber of the magnesium-based solid-state hydrogen storage device via the hydrogen compressor; the flow channel of the magnesium-based solid-state hydrogen storage device is connected to the first heat exchange chamber of the thermal oil evaporator through a pipeline to form a circulation loop; the cold fluid outlet of the cathode-side low-temperature heat exchanger and the cold fluid inlet of the cathode-side high-temperature heat exchanger are respectively connected to the second heat exchange chamber of the thermal oil evaporator.
[0007] In the above technical solution, further, the coupling system of hydrogen production by electrolysis and solid-state hydrogen storage also includes a thermal oil circulation device, and the thermal oil circulation device is connected between the flow channel of the magnesium-based solid-state hydrogen storage device and the first heat exchange chamber of the thermal oil evaporator.
[0008] In any of the above technical solutions, further, the heat transfer oil circulation device is a high temperature resistant pump.
[0009] In any of the above technical solutions, further, the coupling system of hydrogen production by electrolysis and solid-state hydrogen storage also includes a water pump, and the water pump is connected between the liquid phase outlet of the gas-liquid separator and the cold fluid inlet of the cathode-side low-temperature heat exchanger.
[0010] In any of the above technical solutions, further, the coupling system of hydrogen production by electrolysis and solid-state hydrogen storage also includes a softened water inlet pipeline, and the softened water inlet pipeline is connected to the inlet end of the water pump.
[0011] In any of the above technical solutions, further, the solid oxide electrolysis device also includes a cathode side electric heater, and the cathode side electric heater is connected between the solid oxide electrolysis cell and the cathode side high temperature heat exchanger.
[0012] In any of the above technical solutions, further, the solid oxide electrolysis device also includes at least two anode-side heat exchangers, and the solid oxide electrolysis cell and all the anode-side heat exchangers are serially connected.
[0013] In any of the above technical solutions, further, the number of the anode side heat exchangers is two, and they are an anode side high-temperature heat exchanger and an anode side low-temperature heat exchanger respectively.
[0014] In any of the above technical solutions, further, the coupling system of hydrogen production by electrolysis and solid-state hydrogen storage also includes an exhaust pipeline, and the exhaust pipeline is connected to the hot fluid outlet of the anode-side low-temperature heat exchanger.
[0015] In any of the above technical solutions, further, the solid oxide electrolysis device also includes a blower and an anode side electric heater; wherein the blower, the anode side heat exchanger, the anode side electric heater and the solid oxide electrolysis cell are connected in sequence.
[0016] Compared with the prior art, the beneficial effects of this application are:
[0017] In the coupled system of electrolytic hydrogen production and solid-state hydrogen storage provided in the present application, a thermal oil evaporator is used to convert the reaction heat generated in the magnesium-based hydrogen charging process into high-temperature water vapor required for solid oxide electrolytic hydrogen production through heat exchange between thermal oil and water, thereby realizing a clever coupling of the material and thermal management of the hydrogen production system and the hydrogen charging system, and significantly improving the energy utilization rate of the entire system. That is, a thermal oil evaporator is used to couple the solid oxide electrolysis device and the magnesium-based solid-state hydrogen storage device, thereby realizing heat recovery in the hydrogen charging process of the solid-state hydrogen storage system, and also generating raw gas required for the solid oxide hydrogen production system. There is no need to consider the external supply of heat sources, and the heat balance of the entire system can be basically achieved, significantly improving the energy efficiency of the system. At the same time, the high-temperature products generated by the anode and cathode of solid oxide electrolytic hydrogen production use two heat exchangers on the anode and cathode sides to preheat the hydrogen production raw water and air respectively, thereby realizing optimal energy configuration and further improving the energy utilization rate of the system. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0019] Figure 1 A schematic diagram of the structure of a coupled system for hydrogen production by electrolysis and solid-state hydrogen storage provided in an embodiment of the present application.
[0020] Reference numerals:
[0021] 1-blower, 2-anode side low temperature heat exchanger, 3-anode side high temperature heat exchanger, 4-anode side electric heater, 5-solid oxide electrolyzer, 6-cathode side electric heater, 7-cathode side high temperature heat exchanger, 8-cathode side low temperature heat exchanger, 9-gas-liquid separator, 10-hydrogen compressor, 11-magnesium-based solid hydrogen storage device, 12-thermal oil evaporator, 13-thermal oil circulation device, 14-water pump, 21-low temperature air pipeline, 22-medium temperature air pipeline, 23-high temperature air pipeline, 31-high temperature oxygen-enriched Air pipeline, 32-medium temperature oxygen-enriched air pipeline, 33-low temperature oxygen-enriched air pipeline, 41-normal temperature supply water pipeline, 42-low temperature water pipeline, 43-medium temperature water vapor pipeline, 44-high temperature water vapor pipeline, 45-normal temperature condensed water pipeline, 51-high temperature hydrogen / water vapor pipeline, 52-medium temperature hydrogen / water vapor pipeline, 53-low temperature hydrogen / water pipeline, 54-normal temperature hydrogen pipeline, 55-high pressure hydrogen pipeline, 61-external power supply circuit, 71-thermal oil outlet pipeline, 72-thermal oil return pipeline. DETAILED DESCRIPTION
[0022] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.
[0023] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.
[0024] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.
[0025] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0027] Refer to the following Figure 1 The invention describes a coupled system of hydrogen production by electrolysis and solid-state hydrogen storage according to some embodiments of the present application.
[0028] See also Figure 1 As shown, the embodiment of the present application provides a coupled system of electrolytic hydrogen production and solid-state hydrogen storage, comprising: a solid oxide electrolysis device 5, a magnesium-based solid-state hydrogen storage device 11, a thermal oil evaporator 12, and a hydrogen compressor 10; wherein the solid oxide electrolysis device is a technology that uses solid oxide as an electrolyte to promote water electrolysis to produce hydrogen under high temperature (600-1000°C) conditions, and preferably, the solid oxide electrolysis device comprises a solid oxide electrolysis cell 5, a cathode-side high-temperature heat exchanger 7, a cathode-side low-temperature heat exchanger 8, and a gas-liquid separator 9;
[0029] The solid oxide electrolytic cell 5, the cathode side high temperature heat exchanger 7 and the cathode side low temperature heat exchanger 8 are sequentially connected; the inlet and the liquid phase outlet of the gas-liquid separator 9 are respectively connected with the hot fluid outlet end of the cathode side low temperature heat exchanger 8 and the cold fluid inlet end of the cathode side low temperature heat exchanger 8, that is, the inlet of the gas-liquid separator 9 is connected with the hot fluid outlet end of the cathode side low temperature heat exchanger 8, and the liquid phase outlet of the gas-liquid separator 9 is connected with the cold fluid inlet end of the cathode side low temperature heat exchanger 8; the magnesium-based solid hydrogen storage device 11 is formed with a phase-separated chamber and a flow channel, and a magnesium-based solid hydrogen storage material is arranged in the chamber, and a heat transfer oil is arranged in the flow channel;
[0030] The gas phase outlet of the gas-liquid separator 9 is connected to the chamber of the magnesium-based solid-state hydrogen storage device 11 via the hydrogen compressor 10; the flow channel of the magnesium-based solid-state hydrogen storage device 11 is connected to the first heat exchange chamber of the thermal oil evaporator 12 through a pipeline to form a circulation loop; the cold fluid outlet of the cathode-side low-temperature heat exchanger 8 and the cold fluid inlet of the cathode-side high-temperature heat exchanger 7 are respectively connected to the second heat exchange chamber of the thermal oil evaporator 12.
[0031] According to the structure described above, the working process of the coupled system of electrolysis hydrogen production and solid-state hydrogen storage is as follows:
[0032] The external make-up water at room temperature (20-40°C) and the condensed water after gas-liquid separation are combined and pressurized by the water pump 14 described below, and then enter the cathode side low-temperature heat exchanger 8 for heat exchange, absorb part of the heat, and after the temperature rises to 70-90°C, enter the thermal oil evaporator 12 to absorb the heat brought by the thermal oil, and the water becomes 120-150°C water vapor. The water vapor enters the cathode side high-temperature heat exchanger 7 through the medium-temperature water vapor pipeline 43 for heat exchange and becomes high-temperature (700-800°C) water vapor, and the high-temperature water vapor enters the solid oxide electrolytic cell 5;
[0033] After the electrolysis reaction in the solid oxide electrolytic cell 5, the high-temperature (700-800°C) hydrogen and unreacted water vapor generated on the cathode side enter the cathode side high-temperature heat exchanger 7 and the cathode side low-temperature heat exchanger 8 in sequence for heat exchange, and after being cooled to room temperature, enter the gas-liquid separator 9 through the low-temperature hydrogen / water pipeline 53 for separation of hydrogen and condensed water;
[0034] The hydrogen generated by electrolysis in the solid oxide electrolyzer 5 is condensed and purified by the gas-liquid separator 9, enters the hydrogen compressor 10 for pressurization, and then enters the magnesium-based solid hydrogen storage container. The magnesium-based solid hydrogen storage material will release a large amount of heat when charging with hydrogen. The heat heats the heat transfer oil in the flow channel of the magnesium-based solid hydrogen storage container. The heated heat transfer oil is taken out by the heat transfer oil outlet pipe 71 and enters the heat transfer oil evaporator 12 through the heat transfer oil circulation system to transfer the heat to water / water vapor. The temperature of the heat transfer oil is reduced, and then it enters the magnesium-based solid hydrogen storage container through the heat transfer oil return pipe for circulation heat exchange, so as to continuously withdraw the heat in the magnesium-based solid hydrogen storage charging process.
[0035] It can be seen that by using the thermal oil evaporator 12, through the heat exchange between thermal oil and water, the reaction heat generated in the magnesium-based hydrogen charging process is converted into high-temperature water vapor required for solid oxide electrolysis to produce hydrogen, thereby realizing the ingenious coupling of the hydrogen production system and the hydrogen charging system material and thermal management, and significantly improving the energy utilization rate of the entire system. That is to say, the solid oxide electrolysis device 5 and the magnesium-based solid hydrogen storage device 11 are coupled using the thermal oil evaporator 12, thereby realizing heat recovery in the hydrogen charging process of the solid-state hydrogen storage system, and also generating the raw gas required for the solid oxide hydrogen production system. There is no need to consider the external supply of heat sources, and the heat balance of the entire system can be basically achieved, significantly improving the energy efficiency of the system. At the same time, the high-temperature product generated by the cathode of solid oxide electrolysis hydrogen production uses two heat exchangers on the cathode side to preheat the hydrogen production raw water, thereby realizing the optimal configuration of energy and further improving the energy utilization rate of the system.
[0036] In this embodiment, preferably, Figure 1As shown, the solid oxide electrolyzer 5 is connected to the cathode side high temperature heat exchanger 7 through a high temperature hydrogen / water vapor pipeline 51; the cathode side high temperature heat exchanger 7 is connected to the cathode side low temperature heat exchanger 8 through a medium temperature hydrogen / water vapor pipeline 52; the cathode side low temperature heat exchanger 8 is connected to the inlet end of the gas-liquid separator 9 through a low temperature hydrogen / water pipeline 53; the inlet end of the hydrogen compressor 10 is connected to the outlet end of the gas-liquid separator 9 through a normal temperature hydrogen pipeline 54; the inlet end of the chamber of the magnesium-based solid hydrogen storage device 11 is connected to the outlet end of the hydrogen compressor 10 through a high pressure hydrogen pipeline 55; the second heat exchange chamber of the heat transfer oil evaporator 12 is connected to the cathode side high temperature heat exchanger 7 through a medium temperature water vapor pipeline 43; the cathode side electric heater 6 is connected to the cathode side high temperature heat exchanger 7 through a high temperature water vapor pipeline 44, and the solid oxide electrolyzer 5 is equipped with an external power supply circuit 61.
[0037] In this embodiment, preferably, Figure 1 As shown, the coupled system of electrolytic hydrogen production and solid-state hydrogen storage also includes a heat transfer oil circulation device 13, and the heat transfer oil circulation device 13 is connected between the flow channel of the magnesium-based solid-state hydrogen storage device 11 and the first heat exchange chamber of the heat transfer oil evaporator 12.
[0038] According to the structure described above, the heat transfer oil circulation device 13 is used to accelerate the circulation of the heat transfer oil between the magnesium-based solid hydrogen storage device 11 and the heat transfer oil evaporator 12 .
[0039] Further, preferably, the heat transfer oil circulation device 13 is a high temperature resistant pump, which has high temperature resistance, is suitable for high temperature heat transfer oil, and has a longer service life.
[0040] Further, preferably, the coupling system of hydrogen production by electrolysis and solid-state hydrogen storage also includes an expansion tank, which is connected to the pipeline of the aforementioned heat transfer oil circulation device 13 through a pipeline, and is used to compensate for the volume change of the heat transfer oil due to temperature change.
[0041] Further, preferably, Figure 1 As shown, the inlet end of the first heat exchange chamber of the thermal oil evaporator 12 is connected to the outlet end of the flow channel of the magnesium-based solid-state hydrogen storage device 11 through a thermal oil outlet pipe 71; the outlet end of the second heat exchange chamber of the thermal oil evaporator 12 is connected to the inlet end of the flow channel of the magnesium-based solid-state hydrogen storage device 11 through a thermal oil return pipe 72.
[0042] In this embodiment, preferably, Figure 1 As shown, the coupled system of hydrogen production by electrolysis and solid-state hydrogen storage also includes a water pump 14 , and the water pump 14 is connected between the liquid phase outlet of the gas-liquid separator 9 and the cold fluid inlet of the cathode-side low-temperature heat exchanger 8 .
[0043] According to the structure described above, the water pump 14 can drive the condensed water separated by the gas-liquid separator 9 to flow into the cathode-side low-temperature heat exchanger 8 for heat exchange.
[0044] Further, preferably, the water pump 14 is connected to the gas-liquid separator 9 via a normal temperature condensed water pipeline 45 , and the softened water inlet pipeline described below, i.e., the normal temperature feed water pipeline 41 , is connected to the normal temperature condensed water pipeline 45 .
[0045] It should be noted that the water pump 14 may not be provided, and the flow may be achieved by utilizing the difference in high and low water pressures.
[0046] In this embodiment, preferably, Figure 1 As shown, the coupled system of hydrogen production by electrolysis and solid-state hydrogen storage also includes a softened water inlet pipeline, that is, a normal temperature feed water pipeline 41 , and the softened water inlet pipeline is connected to the inlet end of the water pump 14 .
[0047] According to the structure described above, it can be seen that the water supplemented through the softened water inlet pipeline can be combined with the condensed water separated by the gas-liquid separator 9 and pumped into the cathode side low-temperature heat exchanger 8 for heat exchange. The softened water inlet pipeline can provide the initial water for the system to work and continuously replenish water during the operation of the system to ensure that the system can work in a cycle.
[0048] In this embodiment, preferably, Figure 1 As shown, the solid oxide electrolysis device further includes a cathode side electric heater 6 , and the cathode side electric heater 6 is connected between the solid oxide electrolysis cell 5 and the cathode side high temperature heat exchanger 7 .
[0049] According to the structure described above, it can be seen that the high-temperature water vapor needs to pass through the cathode side electric heater 6 before entering the electrolytic cell. The high-temperature water vapor can be heated as needed to balance the temperature fluctuations of the system during startup or operation, and to control the temperature of the water vapor entering the solid oxide electrolytic cell 5 to be maintained within a relatively reasonable and stable range.
[0050] In this embodiment, preferably, Figure 1 As shown, the solid oxide electrolysis device also includes at least two anode-side heat exchangers, and the solid oxide electrolysis cell 5 and all the anode-side heat exchangers are connected in sequence.
[0051] According to the structure described above, the high-temperature products produced on the anode side of solid oxide electrolysis hydrogen production are heated by multiple heat exchangers on the anode side, that is, the air is preheated to achieve optimal energy allocation and further improve the energy utilization rate of the system.
[0052] In this embodiment, preferably, Figure 1As shown, there are two anode side heat exchangers, namely, an anode side high temperature heat exchanger 3 and an anode side low temperature heat exchanger 2 .
[0053] According to the structure described above, the low-temperature heat exchanger 2 on the anode side plays a role in preheating the air, and the high-temperature heat exchanger 3 on the anode side further heats the preheated air, thereby optimizing the configuration of energy and further improving the energy utilization rate of the system. In addition, the equipment investment is relatively small, which reduces the cost. Of course, the number of heat exchangers on the anode side is not limited to two, but can be more than two, such as three or four.
[0054] In this embodiment, preferably, Figure 1 As shown, the coupled system of hydrogen production by electrolysis and solid hydrogen storage also includes an exhaust pipeline, namely a low-temperature oxygen-rich air pipeline 33 , and the exhaust pipeline is connected to the hot fluid outlet of the anode-side low-temperature heat exchanger 2 .
[0055] According to the structure described above, the oxygen-rich air generated after electrolysis can be discharged through the exhaust pipeline.
[0056] In this embodiment, preferably, Figure 1 As shown, the solid oxide electrolysis device further includes a blower 1 and an anode-side electric heater 4; wherein the blower 1, the anode-side heat exchanger, the anode-side electric heater 4 and the solid oxide electrolysis cell 5 are sequentially connected.
[0057] According to the structure described above, the blower 1 can blow external air into the system; the anode side electric heater 4 can heat the incoming air according to actual needs, that is, the anode side electric heater 4 is used to balance the temperature fluctuations of the system during startup or operation, and control the temperature of the water vapor entering the solid oxide electrolytic cell 5 to maintain it within a relatively reasonable and stable range.
[0058] Further, preferably, the blower 1 is connected to the anode side low-temperature heat exchanger 2 through a low-temperature air duct 21, the anode side low-temperature heat exchanger 2 is connected to the anode side high-temperature heat exchanger 3 through a medium-temperature air duct 22, and the anode side high-temperature heat exchanger 3 is connected to the anode side electric heater 4 through a high-temperature air duct 23.
[0059] Further, preferably, the anode side high temperature heat exchanger 3 is connected to the solid oxide electrolytic cell 5 via a high temperature oxygen-enriched air pipeline 31 , and the anode side low temperature heat exchanger 2 is connected to the anode side high temperature heat exchanger 3 via a medium temperature oxygen-enriched air pipeline 32 .
[0060] In summary, the detailed working process of the coupling system of hydrogen production by electrolysis and solid-state hydrogen storage is as follows:
[0061] The working process of the coupled system of electrolysis hydrogen production and solid-state hydrogen storage is as follows:
[0062] The external make-up water at room temperature (20-40°C) and the condensed water after gas-liquid separation are combined and pressurized by the water pump 14, and then enter the cathode side low-temperature heat exchanger 8 for heat exchange, absorb part of the heat, and after the temperature rises to 70-90°C, enter the thermal oil evaporator 12 to absorb the heat brought by the thermal oil, and the water becomes 120-150°C water vapor. The water vapor enters the cathode side high-temperature heat exchanger 7 through the medium-temperature water vapor pipeline 43 for heat exchange and becomes high-temperature (700-800°C) water vapor. The high-temperature water vapor enters the solid oxide electrolytic cell 5 through the cathode side electric heater 6;
[0063] After the electrolysis reaction in the solid oxide electrolytic cell 5, the high-temperature (700-800°C) hydrogen and unreacted water vapor generated on the cathode side enter the cathode side high-temperature heat exchanger 7 and the cathode side low-temperature heat exchanger 8 in sequence for heat exchange, and after being cooled to room temperature, enter the gas-liquid separator 9 through the low-temperature hydrogen / water pipeline 53 for separation of hydrogen and condensed water;
[0064] On the anode side of the solid oxide electrolyzer 5, the normal temperature air is first pressurized by the blower 1 and then heat exchanged and heated by the anode side low temperature heat exchanger 2 and the anode side high temperature heat exchanger 3. At the same time, the temperature is regulated and controlled by the anode side electric heating regulator to stabilize the air temperature entering the anode of the solid oxide electrolyzer 5 within the design range. The high temperature oxygen-rich air generated on the anode side after the reaction in the solid oxide electrolyzer 5 is cooled to a low temperature by heat exchange through the anode side high temperature heat exchanger 3 and the anode side low temperature heat exchanger 2 and then discharged;
[0065] The hydrogen generated by electrolysis in the solid oxide electrolyzer 5 is condensed and purified by the gas-liquid separator 9, enters the hydrogen compressor 10 for pressurization, and then enters the magnesium-based solid hydrogen storage container. The magnesium-based solid hydrogen storage material will release a large amount of heat when charging with hydrogen. The heat heats the heat transfer oil in the flow channel of the magnesium-based solid hydrogen storage container. The heated heat transfer oil is taken out by the heat transfer oil outlet pipe 71 and enters the heat transfer oil evaporator 12 through the heat transfer oil circulation system to transfer the heat to water / water vapor. The temperature of the heat transfer oil is reduced, and then it enters the magnesium-based solid hydrogen storage container through the heat transfer oil return pipe for circulation heat exchange, so as to continuously withdraw the heat in the magnesium-based solid hydrogen storage charging process.
[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A coupled system of electrolytic hydrogen production and solid-state hydrogen storage, characterized in that: include: A solid oxide electrolysis device, a magnesium-based solid hydrogen storage device, a thermal oil evaporator and a hydrogen compressor; wherein the solid oxide electrolysis device comprises a solid oxide electrolysis cell, a cathode side high temperature heat exchanger, a cathode side low temperature heat exchanger and a gas-liquid separator; The solid oxide electrolyzer, the cathode side high temperature heat exchanger and the cathode side low temperature heat exchanger are sequentially connected; the inlet and liquid phase outlet of the gas-liquid separator are respectively connected with the hot fluid outlet end of the cathode side low temperature heat exchanger and the cold fluid inlet end of the cathode side low temperature heat exchanger; the magnesium-based solid hydrogen storage device is formed with a chamber and a flow channel separated from each other, and a magnesium-based solid hydrogen storage material is arranged in the chamber, and heat transfer oil is arranged in the flow channel; The gas phase outlet of the gas-liquid separator is connected to the chamber of the magnesium-based solid-state hydrogen storage device via the hydrogen compressor; the flow channel of the magnesium-based solid-state hydrogen storage device is connected to the first heat exchange chamber of the thermal oil evaporator through a pipeline to form a circulation loop; the cold fluid outlet of the cathode-side low-temperature heat exchanger and the cold fluid inlet of the cathode-side high-temperature heat exchanger are respectively connected to the second heat exchange chamber of the thermal oil evaporator.
2. The coupled system of hydrogen production by electrolysis and solid-state hydrogen storage according to claim 1, characterized in that: The coupled system of electrolytic hydrogen production and solid-state hydrogen storage also includes a heat transfer oil circulation device, and the heat transfer oil circulation device is connected between the flow channel of the magnesium-based solid-state hydrogen storage device and the first heat exchange chamber of the heat transfer oil evaporator.
3. The coupled system of hydrogen production by electrolysis and solid-state hydrogen storage according to claim 2, characterized in that: The heat transfer oil circulation device is a high temperature resistant pump.
4. The coupled system of electrolytic hydrogen production and solid-state hydrogen storage according to claim 1, characterized in that: The coupled system of hydrogen production by electrolysis and solid-state hydrogen storage also includes a water pump, and the water pump is connected between the liquid phase outlet of the gas-liquid separator and the cold fluid inlet of the cathode-side low-temperature heat exchanger.
5. The coupled system of hydrogen production by electrolysis and solid-state hydrogen storage according to claim 4, characterized in that: The coupled system of hydrogen production by electrolysis and solid-state hydrogen storage also includes a softened water inlet pipeline, and the softened water inlet pipeline is connected to the inlet end of the water pump.
6. The coupled system of electrolytic hydrogen production and solid-state hydrogen storage according to claim 1, characterized in that: The solid oxide electrolysis device further includes a cathode side electric heater, and the cathode side electric heater is connected between the solid oxide electrolysis cell and the cathode side high temperature heat exchanger.
7. The coupled system of hydrogen production by electrolysis and solid-state hydrogen storage according to any one of claims 1 to 6, characterized in that: The solid oxide electrolysis device further comprises at least two anode-side heat exchangers, and the solid oxide electrolysis cell and all the anode-side heat exchangers are sequentially connected.
8. The coupled system of hydrogen production by electrolysis and solid-state hydrogen storage according to claim 7, characterized in that: The number of the anode side heat exchangers is two, which are an anode side high temperature heat exchanger and an anode side low temperature heat exchanger respectively.
9. The coupled system of electrolytic hydrogen production and solid-state hydrogen storage according to claim 8, characterized in that: The coupled system of hydrogen production by electrolysis and solid-state hydrogen storage also includes an exhaust pipeline, and the exhaust pipeline is connected to the hot fluid outlet of the anode-side low-temperature heat exchanger.
10. The coupled system of electrolytic hydrogen production and solid-state hydrogen storage according to claim 7, characterized in that: The solid oxide electrolysis device further includes a blower and an anode-side electric heater; wherein the blower, the anode-side heat exchanger, the anode-side electric heater and the solid oxide electrolysis cell are sequentially connected.