Wind-solar energy storage hydrogen production system

Abstract

The utility model discloses a wind-solar energy storage hydrogen production system. The wind-solar energy storage hydrogen production system comprises a wind-solar power generation module, a heat supply module, an SOEC module and an energy storage module, the wind-solar power generation module comprises a wind power generation unit and a photovoltaic power generation unit; the output end of the heat supply module is connected with the SOEC module and supplies heat to the SOEC module; the SOEC module is connected with the wind power generation unit, the photovoltaic power generation unit, the heat supply module and the energy storage module. The energy storage module is at least electrically connected to the wind power generation unit, the photovoltaic power generation unit and the SOEC module. The wind and light energy storage hydrogen production system can effectively and stably supply electric power and heat to the SOEC module, the working condition of the SOEC module is met, the SOEC module can normally work and stably and efficiently produce hydrogen, and efficient hydrogen production is achieved. Meanwhile, wind-light electricity generated by the wind-light electricity generation module supplies power to the wind-light energy storage hydrogen production system, utilization of low-grade electricity such as wind-light electricity is achieved, and on-site consumption of new energy is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogen production, and specifically relates to a wind-solar energy storage hydrogen production system. Background Art

[0002] Solid oxide electrolyzer (SOEC) is a solid oxide fuel cell. In electrolysis mode, under external voltage and high temperature, it electrolyzes H2O to produce H2 and O2, thus converting electrical energy and thermal energy into chemical energy. Among various hydrogen production technologies, solid oxide electrolyzer (SOEC) has the highest energy conversion efficiency, but SOEC technology has the highest cost because the electrolysis reaction needs to occur in a high temperature environment.

[0003] In the existing technology, in order to reduce costs, wind and solar power are used for electric heating to achieve heat supply, but wind and solar power are intermittent, random and volatile, and the power grid has high requirements for the quality of grid-connected wind power and photovoltaic power, so a large amount of wind and solar power abandonment may occur; at the same time, wind and solar power are only used for SOEC, and the heat medium is abandoned when the temperature is lower than the temperature required by SOEC, which has low thermal efficiency and a large amount of heat loss.

[0004] Alternatively, the existing technology also uses coal-fired boilers or other fossil fuels for heat supply, which not only requires the manufacture of related equipment and pipelines, greatly increasing production costs, but also consumes fossil energy and causes environmental pollution.

[0005] Based on this, SOEC is difficult to promote and apply due to major defects in power supply and heating conditions. Utility Model Content

[0006] The purpose of the utility model is to provide a wind-solar energy storage hydrogen production system to solve the above-mentioned problems existing in the prior art.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A wind-solar energy storage hydrogen production system, comprising a wind-solar power generation module, a heating module, a SOEC module and an energy storage module;

[0009] The wind-solar power generation module includes a wind power generation unit and a photovoltaic power generation unit. The output end of the wind power generation unit is electrically connected to the SOEC module and the energy storage module respectively, and the output end of the photovoltaic power generation unit is electrically connected to the SOEC module and the energy storage module respectively;

[0010] The output end of the heating module is connected to the SOEC module and provides heat to the SOEC module;

[0011] The SOEC modules are connected to the wind power generation unit, photovoltaic power generation unit, heating module and energy storage module respectively;

[0012] The energy storage module is at least electrically connected to the wind power generation unit, the photovoltaic power generation unit and the SOEC module to store the electric energy of the wind and photovoltaic power generation module and to supply power to the SOEC module.

[0013] In one possible design, the SOEC module includes a hydrogen production layer, an electrolyte layer and an oxygen production layer connected in sequence, the hydrogen production layer has two opposite ends, one end of which is configured as a hydrogen production end, and the other end is configured as a first power supply end, the oxygen production layer has two opposite ends, one end of which is configured as a by-product production end, and the other end is configured as a second power supply end, and a heating interface is provided on the oxygen production layer, and the heating module supplies heat to the SOEC module through the heating interface.

[0014] In one possible design, the heating module includes a molten salt storage tank, a hot molten salt pipeline, a cold molten salt pipeline, a heat exchanger, and a heating pipe;

[0015] A heater is provided on the molten salt storage tank, and molten salt is stored in the molten salt storage tank; the heat exchanger is connected to the SOEC module through a heating pipe;

[0016] The molten salt storage tank is connected to the inlet of the heat exchanger through a hot molten salt pipeline to transport the hot molten salt to the heat exchanger, and the outlet of the heat exchanger is connected to the molten salt storage tank through a cold molten salt pipeline to return the cold molten salt to the molten salt storage tank.

[0017] In a possible design, when the heating module uses molten salt for heating, an electric heating device is provided on the SOEC module.

[0018] In one possible design, the input end of the energy storage module is electrically connected to the wind power generation unit and the photovoltaic power generation unit, and the output end of the energy storage module is electrically connected to the SOEC module and the heating module; and when the SOEC module is provided with an electric heating device, the output end of the energy storage module is electrically connected to the electric heating device.

[0019] In a possible design, a high-temperature heat storage device for collecting discharge heat is provided on the energy storage module, and an output end of the high-temperature heat storage device is connected to the SOEC module and provides heat for the SOEC module.

[0020] In a possible design, the wind power generation unit includes a wind turbine generator set, a converter and a wind power generation controller connected in series in sequence, and the wind power generation controller is electrically connected to the SOEC module and the energy storage module.

[0021] In a possible design, the photovoltaic power generation unit includes a photovoltaic power generation group, an inverter and a photovoltaic power generation controller connected in series in sequence, and the photovoltaic power generation controller is electrically connected to the SOEC module and the energy storage module.

[0022] Beneficial effects:

[0023] The wind-solar energy storage hydrogen production system can effectively and stably supply electricity and heat to the SOEC module, meeting the working conditions of the SOEC module, so that the SOEC module can work normally and stably and efficiently produce hydrogen, and realize efficient hydrogen production. At the same time, the wind and solar power generation module generates wind and solar energy storage hydrogen production system to power the wind and solar energy storage hydrogen production system, realizing the utilization of low-grade electricity such as wind and solar energy, realizing the local consumption of new energy, reducing dependence on fossil fuels, being more environmentally friendly, and also in line with the concept of green development. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of a wind-solar energy storage and hydrogen production system.

[0025] In the figure:

[0026] 100. Wind and solar power generation module; 110. Wind power generation unit; 120. Photovoltaic power generation unit; 200. Heating module; 210. Molten salt storage tank; 220. Hot molten salt pipeline; 230. Cold molten salt pipeline; 240. Heat exchanger; 250. Heating pipe; 300. SOEC module; 310. Hydrogen production layer; 320. Electrolyte layer; 330. Oxygen production layer; 340. Electric heating equipment; 400. Energy storage module; 500. High-temperature heat storage device. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0028] Example:

[0029] like Figure 1 As shown, a wind-solar energy storage hydrogen production system includes a wind-solar power generation module 100, a heating module 200, a SOEC module 300 and an energy storage module 400;

[0030] The wind-solar power generation module 100 includes a wind power generation unit 110 and a photovoltaic power generation unit 120. The output end of the wind power generation unit 110 is electrically connected to the SOEC module 300 and the energy storage module 400, respectively. The output end of the photovoltaic power generation unit 120 is electrically connected to the SOEC module 300 and the energy storage module 400, respectively.

[0031] The output end of the heating module 200 is connected to the SOEC module 300 and provides heat for the SOEC module 300;

[0032] The SOEC module 300 is respectively connected to the wind power generation unit 110, the photovoltaic power generation unit 120, the heating module 200 and the energy storage module 400;

[0033] The energy storage module 400 is at least electrically connected to the wind power generation unit 110 , the photovoltaic power generation unit 120 and the SOEC module 300 to store the electric energy of the wind-solar power generation module 100 and to supply power to the SOEC module 300 .

[0034] In the wind-solar energy storage hydrogen production system, the wind-solar power generation module 100 includes a wind power generation unit 110 and a photovoltaic power generation unit 120. The wind power generation unit 110 realizes the utilization of wind energy through wind power generation, and the photovoltaic power generation unit 120 realizes the utilization of solar energy through photovoltaic power generation. The two simultaneously generate electricity and supply power to the SOEC module 300, thereby meeting the power demand of the SOEC module 300 during normal operation. At the same time, an energy storage module 400 is also provided. During the peak power generation period of the wind power generation unit 110 and the photovoltaic power generation unit 120, the power consumption of the SOEC module 300 can be met while the power consumption of the SOEC module 300 can be supplied to the energy storage module 400, and power storage is achieved through the energy storage module 400; during the low power generation period of the wind power generation unit 110 and the photovoltaic power generation unit 120, the power generation of the wind power generation unit 110 and the photovoltaic power generation unit 120 is difficult to meet the power consumption of the SOEC module 300, and the energy storage module 400 discharges to make up for the power supply gap of the SOEC module 300. Based on this, the defects of intermittent, random and volatile wind and solar power in actual use are effectively overcome. Not only can long-term stable power supply be achieved, but also the phenomenon of wind and solar power abandonment during peak power generation periods can be avoided.

[0035] Theoretically, the energy storage module 400 can supply electricity to the outside at any time when it stores electric energy, thereby supplying power to the SOEC module 300 and / or the heating module 200. In actual use, in order to overcome the defects of intermittent, random and volatile wind and solar power, the energy storage module 400 preferably supplies power to the SOEC module 300 when the wind and solar power supply is unstable.

[0036] The heating module 200 provides heat for the SOEC module 300 to meet the heating demand of the SOEC module 300 when it is working, and creates a high temperature environment required for the SOEC module 300 to work. The heating module 200 is preferably powered by the energy storage module 400, which reduces the demand for external electricity, improves the independence of the wind-solar energy storage hydrogen production system, and can reduce the heating cost and improve the economy.

[0037] Based on this, the wind-solar energy storage hydrogen production system can effectively and stably supply electricity and heat to the SOEC module 300, meeting the working conditions of the SOEC module 300, so that the SOEC module 300 can work normally and stably and efficiently produce hydrogen, thereby achieving efficient hydrogen production. At the same time, the wind and solar power generated by the wind-solar power generation module 100 supplies power to the wind-solar energy storage hydrogen production system, realizing the utilization of low-grade electricity such as wind and solar power, realizing the local consumption of new energy, reducing dependence on fossil fuels, being more environmentally friendly, and also in line with the concept of green development.

[0038] To sum up, the wind-solar energy storage and hydrogen production system is preferably deployed in mountainous areas, Gobi Desert, and other remote areas with rich wind and solar resources. It can not only realize the development of remote areas and drive local development, but also ensure the power generation of the wind-solar power generation module 100 and ensure that the SOEC module 300 can work stably and efficiently for a long time.

[0039] In this embodiment, the SOEC module 300 includes a hydrogen production layer 310, an electrolyte layer 320 and an oxygen production layer 330 connected in sequence, the hydrogen production layer 310 has two opposite ends, one end of which is configured as a hydrogen production end, and the other end is configured as a first power supply end, the oxygen production layer 330 has two opposite ends, one end of which is configured as a by-product production end, and the other end is configured as a second power supply end, and a heating interface is provided on the oxygen production layer 330, and the heating module 200 supplies heat to the SOEC module 300 through the heating interface.

[0040] Based on the above design, the hydrogen production layer 310 is a hydrogen electrode, which inputs water and supplies electricity, thereby generating hydrogen by electrolyzing water, i.e., H2O+2e - =H2+4O 2- As for the product, hydrogen flows out of the SOEC module 300 through the hydrogen production end, and oxygen ions move to the oxygen production layer 330 through the electrolyte layer 320. The oxygen production layer 330 is the oxygen electrode. After power and heat are supplied, O 2- =1 / 2O2+2e - , thereby producing oxygen, which flows out of the SOEC module 300 through the by-product gas production end.

[0041] In this embodiment, the heating module 200 includes a molten salt storage tank 210, a hot molten salt pipeline 220, a cold molten salt pipeline 230, a heat exchanger 240 and a heating pipe 250;

[0042] A heater is provided on the molten salt storage tank 210, and molten salt is stored in the molten salt storage tank 210; the heat exchanger 240 is connected to the SOEC module 300 through a heating pipe 250;

[0043] The molten salt storage tank 210 is connected to the inlet of the heat exchanger 240 through the hot molten salt pipeline 220 to transport the hot molten salt to the heat exchanger 240 , and the outlet of the heat exchanger 240 is connected to the molten salt storage tank 210 through the cold molten salt pipeline 230 to return the cold molten salt to the molten salt storage tank 210 .

[0044] Based on the above design scheme, molten salt has the advantages of wide liquid temperature, large heat storage temperature difference, high heat storage density, good heat transfer performance, stable working state, low cost, etc., and is suitable for large-scale heat storage. The molten salt is stored in the molten salt storage tank 210, and the heater is started and heats the molten salt; after the molten salt is heated, it flows into the heat exchanger 240, and high-temperature steam is generated through the heat exchanger 240; the high-temperature steam flows to the SOEC module 300 through the heating pipe 250 and provides heat for the SOEC module 300. After heat exchange, the molten salt flows back to the molten salt storage tank 210, thereby realizing the circulation and circulating heating of the molten salt.

[0045] In this embodiment, when the heating module 200 uses molten salt for heating, an electric heating device 340 is provided on the SOEC module 300. Based on the above design scheme, in actual use, the temperature of the high-temperature steam generated by the heat exchange of the hot molten salt in the heat exchanger 240 is 500-550°C, and the high temperature required by the SOEC module 300 is 800-850°C. Therefore, when molten salt is used for heating, the SOEC module 300 is provided with an electric heating device 340, and heat is supplemented by the electric heating device 340 to ensure that the SOEC module 300 reaches the high temperature required for operation.

[0046] It is easy to understand that the electric heating device 340 can be any suitable commercially available model.

[0047] In this embodiment, the input end of the energy storage module 400 is electrically connected to the wind power generation unit 110 and the photovoltaic power generation unit 120, and the output end of the energy storage module 400 is electrically connected to the SOEC module 300 and the heating module 200; and when the SOEC module 300 is provided with an electric heating device 340, the output end of the energy storage module 400 is electrically connected to the electric heating device 340.

[0048] Based on the above design scheme, in the wind-solar energy storage hydrogen production system, functional modules other than the wind-solar power generation module 100, such as the heating module 200 and the SOEC module 300, can all be powered by the energy storage module 400. The wind-solar energy storage hydrogen production system achieves self-sufficiency, reduces dependence on external electricity, and improves work independence.

[0049] It is easy to understand that when the wind-solar energy storage hydrogen production system is provided with other functional modules, it can also be powered by the energy storage module 400 if conditions permit.

[0050] In this embodiment, a high-temperature heat storage device 500 for collecting discharge heat is provided on the energy storage module 400, and the output end of the high-temperature heat storage device 500 is connected to the SOEC module 300 and provides heat for the SOEC module 300. Based on the above design scheme, the energy storage module 400 will also generate a certain amount of heat when working, and this part of heat is collected by the high-temperature heat storage device 500 and supplied to the SOEC module 300, which increases the source of heat supply, which can not only improve energy utilization, but also reduce the heating burden of the heating module 200.

[0051] In this embodiment, the wind power generation unit 110 includes a wind power generator set, a converter and a wind power generation controller connected in series, and the wind power generation controller is electrically connected to the SOEC module 300 and the energy storage module 400. Based on the above design scheme, the wind power generator set converts the kinetic energy of wind into electrical energy; the converter adjusts the voltage, frequency, phase number and other parameters of the wind power generator set; the wind power generation controller can control the operation of the wind power generator set and control the external power supply, so as to realize the automatic operation of the wind power generation unit 110.

[0052] In this embodiment, the photovoltaic power generation unit 120 includes a photovoltaic power generation group, an inverter and a photovoltaic power generation controller connected in series, and the photovoltaic power generation controller is electrically connected to the SOEC module 300 and the energy storage module 400. Based on the above design scheme, the photovoltaic power generation group converts solar energy into electrical energy; the inverter adjusts the voltage, frequency, phase number and other parameters of the photovoltaic power generation group; the photovoltaic power generation controller can control the operation of the photovoltaic power generation group and control the external power supply, so as to realize the automatic operation of the photovoltaic power generation unit 120.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wind and solar energy storage hydrogen production system, characterized in that: It comprises a wind and solar power generation module (100), a heating module (200), a SOEC module (300) and an energy storage module (400); The wind-solar power generation module (100) comprises a wind power generation unit (110) and a photovoltaic power generation unit (120); the output end of the wind power generation unit (110) is electrically connected to the SOEC module (300) and the energy storage module (400), respectively; the output end of the photovoltaic power generation unit (120) is electrically connected to the SOEC module (300) and the energy storage module (400), respectively; The output end of the heating module (200) is connected to the SOEC module (300) and provides heat for the SOEC module (300); The SOEC module (300) is respectively connected to the wind power generation unit (110), the photovoltaic power generation unit (120), the heating module (200) and the energy storage module (400); The energy storage module (400) is electrically connected to at least the wind power generation unit (110), the photovoltaic power generation unit (120) and the SOEC module (300) to store the electric energy of the wind and photovoltaic power generation module (100) and to supply power to the SOEC module (300).

2. The wind-solar energy storage hydrogen production system according to claim 1 is characterized in that: The SOEC module (300) comprises a hydrogen production layer (310), an electrolyte layer (320) and an oxygen production layer (330) which are connected in sequence. The hydrogen production layer (310) has two opposite ends, one end of which is configured as a hydrogen production end and the other end of which is configured as a first power supply end. The oxygen production layer (330) has two opposite ends, one end of which is configured as a byproduct production end and the other end of which is configured as a second power supply end. A heat supply interface is provided on the oxygen production layer (330), and the heat supply module (200) supplies heat to the SOEC module (300) through the heat supply interface.

3. The wind-solar energy storage hydrogen production system according to claim 1 is characterized in that: The heating module (200) comprises a molten salt storage tank (210), a hot molten salt pipeline (220), a cold molten salt pipeline (230), a heat exchanger (240) and a heating pipe (250); A heater is provided on the molten salt storage tank (210), and molten salt is stored in the molten salt storage tank (210); the heat exchanger (240) is connected to the SOEC module (300) via a heat supply pipe (250); The molten salt storage tank (210) is connected to the inlet of the heat exchanger (240) through the hot molten salt pipeline (220) to transport the hot molten salt to the heat exchanger (240), and the outlet of the heat exchanger (240) is connected to the molten salt storage tank (210) through the cold molten salt pipeline (230) to return the cold molten salt to the molten salt storage tank (210).

4. The wind-solar energy storage hydrogen production system according to claim 1 or 3, characterized in that: When the heating module (200) uses molten salt for heating, the SOEC module (300) is provided with an electric heating device (340).

5. The wind-solar energy storage hydrogen production system according to claim 1 is characterized in that: The input end of the energy storage module (400) is electrically connected to the wind power generation unit (110) and the photovoltaic power generation unit (120), and the output end of the energy storage module (400) is electrically connected to the SOEC module (300) and the heating module (200); and when the SOEC module (300) is provided with an electric heating device (340), the output end of the energy storage module (400) is electrically connected to the electric heating device (340).

6. The wind-solar energy storage hydrogen production system according to claim 1 or 5, characterized in that: The energy storage module (400) is provided with a high-temperature heat storage device (500) for collecting discharge heat, and the output end of the high-temperature heat storage device (500) is connected to the SOEC module (300) and provides heat for the SOEC module (300).

7. The wind-solar energy storage hydrogen production system according to claim 1 is characterized in that: The wind power generation unit (110) comprises a wind power generation set, a converter and a wind power generation controller which are sequentially connected in series, and the wind power generation controller is electrically connected to the SOEC module (300) and the energy storage module (400).

8. The wind-solar energy storage hydrogen production system according to claim 1 is characterized in that: The photovoltaic power generation unit (120) comprises a photovoltaic power generation group, an inverter and a photovoltaic power generation controller which are sequentially connected in series, and the photovoltaic power generation controller is electrically connected to the SOEC module (300) and the energy storage module (400).

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