Wind-solar hydrogen production system and wind-solar hydrogen production method

Abstract

The invention relates to a wind-solar hydrogen production system and a wind-solar hydrogen production method.The wind-solar hydrogen production system comprises a photovoltaic power generation module, a wind power generation module, a water electrolysis hydrogen production module and a low-pressure hydrogen storage module, and the water electrolysis hydrogen production module is connected with the low-pressure hydrogen storage module through a pipeline; and a positive water seal and a reverse water seal are arranged on the pipeline. The wind and light hydrogen production system can stabilize the pressure (3-20 kPa) of the hydrogen outlet of the wind and light hydrogen production electrolytic cell, so that stable hydrogen consumption is continuously provided for a downstream hydrogen using module. The stable pressure of the low-pressure hydrogen storage module enables the pressure of the hydrogen side outlet of the hydrogen production electrolytic cell not to fluctuate along with the fluctuation of the wind-solar power generation power load through positive and negative water sealing, and then the hydrogen-oxygen pressure difference of the electrolytic cell is kept stable. The low-pressure hydrogen storage module with the corresponding volume is arranged according to the 24-hour accumulated hydrogen production amount of the electrolytic cell and the stable hydrogen demand amount per hour of a downstream customer, and the 24-hour stable use amount can be provided for downstream hydrogen use.

Description

Technical Field

[0001] The present invention belongs to the technical field of green energy, and specifically relates to a wind-solar hydrogen production system and a wind-solar hydrogen production method, in particular to a stable wind-solar hydrogen production system and a wind-solar hydrogen production method. Background Art

[0002] With the continuous development of wind power generation and photovoltaic power generation technology, the proportion of new energy power generation in my country is constantly increasing, and the amount of new energy power generation is also increasing. Hydrogen energy, as a carrier of clean energy, is a key link in energy transformation. According to my country's hydrogen energy planning and market demand, the demand for hydrogen energy will show explosive growth in the future. At present, the main source of hydrogen is fossil fuel production, and a large amount of greenhouse gases will be emitted during the production process. High-purity hydrogen can be obtained by electrolyzing water to produce hydrogen, and near-zero carbon emissions are emitted during the hydrogen production process. Electrolysis of water to produce hydrogen is the main way to produce green hydrogen, which is achieved through power supply from large power grids, but the electricity bill expenditure leads to high hydrogen production costs, which does not have a price advantage compared to fossil energy hydrogen production. Therefore, in order to reduce the cost of electrolysis of water to produce hydrogen and promote the consumption of new energy, the combination of renewable energy power and electrolysis of water to produce hydrogen technology to achieve the conversion of electricity and hydrogen energy will be conducive to promoting the development of my country's hydrogen energy industry.

[0003] However, the output of wind power generation is affected by natural wind power and has great volatility. This volatility is mainly reflected in two aspects: one is the large daily change rate, that is, the output power of wind power generation will fluctuate significantly within a day; the other is the large seasonal change rate, that is, the output power of wind power generation in different seasons will have large differences. This volatility makes wind power generation show strong seasonal and intermittent characteristics. Similarly, the output of photovoltaic power generation systems is also directly affected by natural conditions, especially the changes in sunlight. When the intensity of sunlight changes rapidly, the output power of photovoltaic power generation systems will fluctuate rapidly over a large range. This volatility makes photovoltaic power generation systems also have random and intermittent characteristics. Due to the uncertainty of natural conditions, the output of wind power generation and photovoltaic power generation systems are uncertain and volatile. This volatility will not only affect the stability of the power generation system, but also have an impact on the downstream hydrogen use system. Specifically, in the process of hydrogen production by wind and solar power generation, this fluctuating property will cause the hydrogen and oxygen pressure of the hydrogen production electrolyzer to fluctuate, thereby affecting the life of the electrolyzer and increasing safety hazards. At the same time, this volatility will also reduce the quality and purity of hydrogen, resulting in the inability to provide a stable amount of hydrogen to downstream users. Summary of the invention

[0004] In order to improve the above technical problems, the present invention provides a wind-solar hydrogen production system, which includes: a photovoltaic power generation module, a wind power generation module, a water electrolysis hydrogen production module and a low-pressure hydrogen storage module, wherein the water electrolysis hydrogen production module is connected to the low-pressure hydrogen storage module through a pipeline, and a positive water seal and a reverse water seal are arranged on the pipeline.

[0005] According to an embodiment of the present invention, in the wind-solar hydrogen production system, the photovoltaic power generation module and the wind power generation module are arranged in parallel and connected in series with the water electrolysis hydrogen production module, thereby providing energy for the water electrolysis hydrogen production module.

[0006] According to an embodiment of the present invention, the water electrolysis hydrogen production module is connected to the positive water seal and the reverse water seal through pipelines respectively.

[0007] According to an embodiment of the present invention, the positive water seal and reverse water seal may be positive water seal and reverse water seal devices known in the art.

[0008] According to an exemplary embodiment of the present invention, the first air inlet is provided at the left end of the top of the positive water seal, and the first air outlet is provided at the right end of the top of the positive water seal; the second air outlet is provided at the left end of the top of the reverse water seal, and the second air inlet is provided at the right end of the top of the reverse water seal; the first air inlet of the positive water seal is connected to the second air outlet of the reverse water seal, and the first air outlet of the positive water seal is connected to the second air inlet of the reverse water seal. This realizes the intrinsic safety of the three functions of back and forth non-return, pressure stabilization, and fire prevention.

[0009] According to an embodiment of the present invention, the positive water seal is further provided with a first water replenishment port, a first liquid level display and control port, and a first drainage port.

[0010] According to an embodiment of the present invention, a first sight glass (for example, the first sight glass is circular) is also provided on the positive water seal for observation.

[0011] According to an embodiment of the present invention, the reverse water seal is also provided with a second water replenishment port, a second liquid level display, a second control port and a drain port.

[0012] According to an embodiment of the present invention, a second viewing mirror (for example, the second viewing mirror is circular) is also provided on the reverse water seal for observation.

[0013] According to an embodiment of the present invention, the wind-solar hydrogen production system further includes a DCS (Distributed Control System) control system.

[0014] According to an embodiment of the present invention, the low-pressure hydrogen storage module is connected to the positive water seal and the reverse water seal through pipelines respectively.

[0015] According to an embodiment of the present invention, the wind-solar hydrogen production system further includes a hydrogen compression module, which is connected to the water electrolysis hydrogen production module, the positive water seal and the reverse water seal through pipelines. For example, the hydrogen compression module is a water ring hydrogen compressor.

[0016] According to an embodiment of the present invention, the wind-solar hydrogen production system further includes a downstream hydrogen module located downstream of the hydrogen compression module, and the downstream hydrogen module is connected to the hydrogen compression module via a pipeline.

[0017] According to an embodiment of the present invention, the wind-solar hydrogen production system further includes an oxygen collection module, and the oxygen collection module is connected to the anode electrode of the water electrolysis hydrogen production module.

[0018] According to an embodiment of the present invention, the wind-solar hydrogen production system may further include an electric energy storage module, which is disposed between the photovoltaic power generation module, the wind power generation module and the water electrolysis hydrogen production module, or disposed within the water electrolysis hydrogen production module, so that the electric energy generated by the photovoltaic power generation module and the wind power generation module is stored in the electric energy storage module, so that the electric energy storage module supplies power to the water electrolysis hydrogen production module. As an example, when the wind-solar hydrogen production system includes an electric energy storage module, the photovoltaic power generation module and the wind power generation module are connected in parallel with the electric energy storage module so that the electric energy is stored in the electric energy storage module, and the electric energy storage module provides energy for the water electrolysis hydrogen production module.

[0019] According to an embodiment of the present invention, the electrical energy storage module is selected from one or more of a gravity energy storage module, a chemical energy storage module and a battery energy storage module.

[0020] According to an embodiment of the present invention, a pressure regulating module, such as a pressure regulating valve, is provided at the hydrogen outlet of the water electrolysis hydrogen production module.

[0021] According to an embodiment of the present invention, the water electrolysis hydrogen production module may be an electrolyzer for water electrolysis hydrogen production known in the art.

[0022] According to an exemplary embodiment of the present invention, a cathode electrode is provided at the top left end of the water electrolysis hydrogen production module, and the cathode electrode is connected to the positive water seal and the reverse water seal through pipelines; an anode electrode is provided at the top right end of the water electrolysis hydrogen production module, and the anode electrode is connected to the oxygen collection module through pipelines.

[0023] According to an embodiment of the present invention, the low-pressure hydrogen storage module is a hydrogen gas tank, for example, a wet single-section vertical lift gas tank.

[0024] According to an exemplary embodiment of the present invention, the low-pressure hydrogen storage module includes a water storage unit and a sealing unit arranged on the upper part of the water storage unit. Preferably, the water storage unit is, for example, a water tank; and the sealing unit can be selected from a sealing cover, such as a bell jar.

[0025] In one embodiment of the present invention, the water storage unit and the closed unit are connected by a guide rail. Preferably, the guide rail is, for example, a vertical lift guide rail, so that the liquid level of the low-pressure hydrogen storage module rises and falls with the pressure change, thereby achieving the purpose of pressure stabilization.

[0026] In one embodiment of the present invention, a third air inlet is provided on the water storage unit, and the first air outlet of the positive water seal and the second air inlet of the reverse water seal are respectively connected to the third air inlet through pipelines.

[0027] In one embodiment of the present invention, a counterweight is disposed on the top of the closed unit, and the pressure in the water storage unit is adjusted by the counterweight.

[0028] In one embodiment of the present invention, the low-pressure hydrogen storage module is further provided with a liquid level monitoring unit. For example, the liquid level monitoring unit is a liquid level meter. The liquid level in the low-pressure hydrogen storage module is monitored in real time by the liquid level meter and transmitted to the control system.

[0029] In one embodiment of the present invention, the water storage unit is provided with a third water replenishment port, a steam inlet, a circulating water inlet, a steam condensate outlet, a drain port, a replacement drain port and a condensate drain port to achieve hydrogen storage.

[0030] In one embodiment of the present invention, a replacement port and a venting port are provided on the closed unit to achieve the purpose of system replacement and safe operation of starting and stopping.

[0031] According to an embodiment of the present invention, the wind-solar hydrogen production system includes a photovoltaic power generation module and a wind power generation module, an electric energy storage module, an electrolytic water hydrogen production module, a positive water seal and a reverse water seal, a low-pressure hydrogen storage module, a hydrogen compression module and a downstream hydrogen use module in sequence, wherein the electrolytic water hydrogen production module, the hydrogen compression module and the low-pressure hydrogen storage module are respectively connected to the positive water seal and the reverse water seal through pipelines.

[0032] According to an embodiment of the present invention, the hydrogen storage capacity V of the low-pressure hydrogen storage module 储 It complies with the following formula (1):

[0033] V 储 =V h ×24 (1)

[0034] Among them, V h It is the hydrogen consumption per hour of the downstream hydrogen module.

[0035] According to an embodiment of the present invention, the hydrogen production capacity V of the water splitting hydrogen production module is 产 It complies with the following formula (2):

[0036] V 产 =V 储 / T (2)

[0037] Wherein, T is the cumulative full-load operation time of the water splitting hydrogen production module.

[0038] According to an embodiment of the present invention, the hydrogen outlet pressure of the water electrolysis hydrogen production module is 3-20 kPa.

[0039] According to an embodiment of the present invention, the hydrogen outlet pressure of the low-pressure hydrogen storage module is 2-15 kPa.

[0040] According to an embodiment of the present invention, preferably, the design value of the pressure of the low-pressure hydrogen storage module is determined according to the design parameters of the inlet of the hydrogen compressor.

[0041] The present invention also provides a method for producing hydrogen by wind and solar power, comprising producing hydrogen using the above-mentioned wind and solar power generation system. Preferably, the electric energy generated by the photovoltaic power generation module and the wind power generation module is used as the energy source of the water electrolysis hydrogen production module, the water electrolysis hydrogen production module produces hydrogen and oxygen, and the hydrogen produced by the water electrolysis hydrogen production module is sent to the low-pressure hydrogen storage module for storage through a positive water seal.

[0042] According to an embodiment of the present invention, the method for producing hydrogen from wind and solar power comprises the following steps:

[0043] S1. The electricity generated by the photovoltaic power generation module and the wind power generation module supplies power to the water electrolysis hydrogen production module. The water electrolysis hydrogen production module electrolyzes water to produce hydrogen and oxygen. The prepared hydrogen is stored in the low-pressure hydrogen storage module after positive water sealing, and / or is compressed by a hydrogen compression module (such as a water ring hydrogen compressor) for use by the downstream hydrogen module;

[0044] S2. When the power generation of the photovoltaic power generation module and the wind power generation module is greater than the power consumption of the water electrolysis hydrogen production module, the electric energy storage module works to store the excess power generation;

[0045] S3. When the hydrogen storage in the low-pressure hydrogen storage module is greater than the preset maximum value, it is fed back to the water electrolysis hydrogen production module, and the water electrolysis hydrogen production module stops working or reduces the power, and the excess power generation is stored in the electric energy storage module;

[0046] S4. When the power generation of the photovoltaic power generation module and the wind power generation module is less than the power consumption of the water electrolysis hydrogen production module, the hydrogen stored in the low-pressure hydrogen storage module is consumed first (the hydrogen stored in the low-pressure hydrogen storage module is compressed by the hydrogen compression module through the reverse water seal and supplied to the downstream hydrogen module, and at the same time flows back to the water electrolysis hydrogen production module to stabilize the hydrogen outlet pressure of the water electrolysis hydrogen production module); when the hydrogen stored in the low-pressure hydrogen storage module is less than the preset minimum value, the electric energy storage module is turned on to supply power to the water electrolysis hydrogen production module.

[0047] According to an embodiment of the present invention, in step S1, the hydrogen outlet pressure of the water electrolysis hydrogen production module is 3-20 kPa.

[0048] According to an embodiment of the present invention, in step S1, the temperature in the water electrolysis hydrogen production module is controlled at 80-90°C.

[0049] Beneficial effects:

[0050] (1) The wind-solar hydrogen production system of the present invention can stabilize the hydrogen outlet pressure (3-20kPa) of the electrolyzer of the wind-solar hydrogen production module, thereby continuously providing a stable amount of hydrogen for the downstream hydrogen module. Among them, the stable low-pressure hydrogen storage module pressure is achieved through the "positive and reverse water seal" (i.e., positive water seal and reverse water seal) so that the pressure at the hydrogen side outlet of the hydrogen production electrolyzer does not fluctuate widely with the fluctuation of the wind-solar power generation load, thereby maintaining the stability of the hydrogen-oxygen pressure difference of the electrolyzer. According to the cumulative hydrogen production of the electrolyzer in 24 hours and the stable hydrogen demand per hour of the downstream customers, the present invention sets a low-pressure hydrogen storage module of corresponding volume, which can provide a stable amount of hydrogen for downstream use in 24 hours. At the same time, the present invention prevents the hydrogen stored in the low-pressure hydrogen storage module from flowing back to the water electrolysis hydrogen production module and the hydrogen pipeline connected thereto by setting a "reverse" water seal, so that the hydrogen pressure in the low-pressure hydrogen storage module is always kept at a constant pressure operation, so that the inlet pressure of the hydrogen compression module connected thereto is constant, thereby promoting the stable operation of the compressor of the hydrogen compression module to extend its service life.

[0051] (2) The synergistic effect of the forward and reverse water seals and the low-pressure hydrogen storage module in the wind-solar hydrogen production system of the present invention has the following advantages compared with high-pressure hydrogen storage devices such as high-pressure spherical tanks:

[0052] 1. The low-pressure hydrogen storage module has a constant and low pressure, which reduces the risk of hydrogen leakage and increases safety.

[0053] 2. The low-pressure hydrogen storage module serves as the outlet pressure of the hydrogen pressure regulating valve of the water electrolysis hydrogen production system, reducing the difficulty of adjusting the hydrogen-side pressure regulating valve of the water electrolysis hydrogen production module caused by fluctuations in the wind power generation module and the photovoltaic power generation module, thereby reducing the hydrogen pressure fluctuation of the water electrolysis hydrogen production module and thus reducing the fluctuation of hydrogen quality.

[0054] 3. The hydrogen pressure of the hydrogen storage module will not change with the changes in the hydrogen production of the hydrogen production module and the downstream hydrogen consumption, but can always maintain a constant hydrogen pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 A schematic diagram of a wind-solar hydrogen production system according to the present invention;

[0056] Figure 2 It is a schematic diagram of the structure of the positive water seal and the reverse water seal of the present invention;

[0057] Figure 3 It is a structural schematic diagram of the low-pressure hydrogen storage module of the present invention;

[0058] The reference numerals have the following meanings:

[0059] 1-1: Wind power generation module; 1-2: Photovoltaic power generation module; 2: Water electrolysis hydrogen production module; 3-1: Positive water seal; 311: First air inlet; 312: First air outlet; 313: First water replenishment port; 314: First liquid level display and control port; 315: First drainage port; 316: First sight glass; 3-2: Reverse water seal; 321: Second air inlet; 322: Second air outlet; 323: Second water replenishment port; 324: Second liquid level display and control port; 325: The second drain outlet; 326: the second sight glass; 4: the low-pressure hydrogen storage module; 41: the water storage unit; 411: the third water replenishment port; 412: the steam inlet; 413: the circulating water inlet; 414: the steam condensate outlet; 415: the drain outlet; 416: the third air inlet; 417: the displacement drain outlet; 418: the condensate drain outlet; 42: the closed unit; 421: the displacement port; 422: the venting port; 5: the hydrogen compression module; 6: the downstream hydrogen module; 7: the oxygen collection module. DETAILED DESCRIPTION

[0060] The technical scheme of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only exemplary descriptions and explanations of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included in the scope that the present invention is intended to protect.

[0061] Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

[0062] Example 1: Wind and solar hydrogen production system

[0063] Reference Figure 1 The present embodiment provides a wind-solar hydrogen production system, which comprises a photovoltaic power generation module 1-1 and a wind power generation module 1-2 arranged in parallel, an electric energy storage module, a water electrolysis hydrogen production module 2, a positive water seal 3-1 and a reverse water seal 3-2, a low-pressure hydrogen storage module 4, a hydrogen compression module 5 and a downstream hydrogen use module 6, wherein the water electrolysis hydrogen production module 2, the hydrogen compression module 5 and the low-pressure hydrogen storage module 4 are respectively connected to the positive water seal 3-1 and the reverse water seal 3-2 through pipelines, and the downstream hydrogen use module 6 is connected to the hydrogen compression module 5 through a pipeline.

[0064] Preferably, the wind-solar hydrogen production system further includes an electric energy storage module ( Figure 1(not shown), the electric energy generated by the photovoltaic power generation module 1-2 and the wind power generation module 1-1 is stored in the electric energy storage module, so that the electric energy storage module supplies power to the water electrolysis hydrogen production module 2; wherein the electric energy storage module is selected from one or more of a gravity energy storage module, a chemical energy storage module and a battery energy storage module.

[0065]

Electrolysis of water to produce hydrogen module

[0066] A cathode electrode is provided at the left end of the top of the water electrolysis hydrogen production module 2, and a hydrogen tube is sleeved on the top of the cathode electrode, and the outside of the hydrogen tube is connected to the positive water seal 3-1 and the reverse water seal 3-2; an anode electrode is provided at the right end of the top of the water electrolysis hydrogen production module 2, and an oxygen tube is sleeved on the top of the anode electrode, and the outside of the oxygen tube is connected to the oxygen collection module 7.

[0067] [Positive water seal, reverse water seal]

[0068] The first air inlet 311 is provided at the left end of the top of the positive water seal, and the first air outlet 312 is provided at the right end of the top of the positive water seal; the second air outlet 322 is provided at the left end of the top of the reverse water seal, and the second air inlet 321 is provided at the right end of the top of the reverse water seal; the first air inlet 311 of the positive water seal is connected to the second air outlet 322 of the reverse water seal, and the first air outlet 312 of the positive water seal is connected to the second air inlet 321 of the reverse water seal. This realizes the intrinsic safety of the three functions of back and forth non-return, pressure stabilization and fire prevention.

[0069] The positive water seal 3 - 1 is also provided with a first water replenishment port 313 , a first liquid level display and control port 314 , a first drain port 315 and a circular first sight glass 316 for observation.

[0070] The reverse water seal is also provided with a second water replenishment port 323, a second liquid level display and control port 324, a second drainage port 325 and a circular second sight glass 326 for observation.

[0071] The wind-solar hydrogen production system also includes a DCS (Distributed Control System) control system.

[0072]

Low-pressure hydrogen storage module

[0073] The low-pressure hydrogen storage module 4 is a wet single-section vertical lift gas tank, including a water storage unit 41 and a closed unit 42 arranged on the upper part of the water storage unit; the water storage unit 41 is a water tank; the closed unit 42 is a bell jar.

[0074] The water storage unit 41 and the closed unit 42 are connected by a vertical lifting rail, so that the liquid level of the low-pressure hydrogen storage module rises and falls with the pressure change, thereby achieving the purpose of pressure stabilization.

[0075] The water storage unit 41 is provided with a third air inlet 416 , and the first air outlet 312 of the positive water seal 3 - 1 and the second air inlet 321 of the reverse water seal 3 - 2 are connected to the third air inlet 416 through pipelines, respectively.

[0076] A counterweight block is disposed on the top of the closed unit 42, and the pressure in the water storage unit is adjusted by the counterweight block.

[0077] The low-pressure hydrogen storage module 4 is also provided with a liquid level monitoring unit, which is a liquid level meter. The liquid level in the low-pressure hydrogen storage module is monitored in real time by the liquid level meter and transmitted to the control system.

[0078] The water storage unit 41 is provided with a third water replenishment port 411 , a steam inlet 412 , a circulating water inlet 413 , a steam condensate outlet 414 , a drain port 415 , a replacement drain port 417 and a condensate drain port 418 to achieve hydrogen storage.

[0079] The enclosed unit 42 is provided with a replacement port 421 and a venting port 422 to achieve the purpose of system replacement and safe operation of starting and stopping.

[0080] Example 2

[0081] The method for producing hydrogen by wind and solar power comprises the following steps:

[0082] S1. In the wind-solar hydrogen production system of Example 1, the electric energy generated by the photovoltaic power generation module 1-2 and the wind power generation module 1-1 supplies power to the water electrolysis hydrogen production module 2. The water electrolysis hydrogen production module 2 (the temperature in the water electrolysis hydrogen production module is controlled at 80-90°C) electrolyzes water to prepare hydrogen and oxygen. The prepared hydrogen passes through the positive water seal 3-1, and is stored in the hydrogen gas cabinet through the pipeline through the third air inlet 416 of the low-pressure hydrogen storage module 4, and is compressed by the water ring hydrogen compressor (the compressor performance parameter is an inlet pressure of 5kPa) for use by the downstream hydrogen module 6; wherein, the oxygen outlet pressure of the water electrolysis hydrogen production module 2 is 12kPa, and the hydrogen outlet is set to 15kPa through the pressure regulating valve, and the pressure transported to the hydrogen gas cabinet through the pipeline through the positive water seal 3-1 is always a stable 5kPa;

[0083] S2, when the power generation of the photovoltaic power generation module 1-2 and the wind power generation module 1-1 is greater than the power consumption of the water electrolysis hydrogen production module 2, the electric energy storage module works to store the excess power generation;

[0084] S3, when the hydrogen storage of the low-pressure hydrogen storage module 4 is greater than the preset maximum value, it is fed back to the water electrolysis hydrogen production module 2, the water electrolysis hydrogen production module 2 stops working or reduces the power, and the excess power generation is stored in the electric energy storage module;

[0085] S4. When the power generation of the photovoltaic power generation module 1-2 and the wind power generation module 1-1 is less than the power consumption of the water electrolysis hydrogen production module 2, the hydrogen stored in the low-pressure hydrogen storage module 4 passes through the reverse water seal 3-2 and is compressed by the water ring hydrogen compressor for use by the downstream hydrogen module 6, and then flows back to the water electrolysis hydrogen production module 2 to stabilize the hydrogen outlet pressure of the water electrolysis hydrogen production module 2; when the hydrogen stored in the low-pressure hydrogen storage module 4 is less than the preset minimum value, the electric energy storage module is turned on to supply power to the water electrolysis hydrogen production module 2.

[0086] When the hydrogen consumption of the downstream hydrogen module 6 is 500Nm 3 / h, and when hydrogen is used continuously for 24 hours, the hydrogen storage capacity of the low-pressure hydrogen storage module 4 is designed to meet the 24-hour hydrogen use of the downstream. The designed hydrogen storage capacity of the low-pressure hydrogen storage module 4 is 500*24=12000Nm 3 The wind-solar hydrogen production system of this embodiment is used to produce hydrogen by wind-solar power generation. If the water electrolysis hydrogen production module 2 operates at full load for 6 hours a day (within 24 hours), a 12000Nm 3 / 6h=2000Nm 3 / h water electrolysis hydrogen production module 2, can be a 2000Nm 3 / h or 2 units 1000Nm 3 / h normal pressure square electrolyzer to produce hydrogen.

[0087] The above is an exemplary description of the embodiments of the present invention. However, the protection scope of the present invention is not limited to the above embodiments. Any modification, equivalent substitution, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A wind-solar hydrogen production system, characterized in that: The wind-solar hydrogen production system comprises: a photovoltaic power generation module, a wind power generation module, a water electrolysis hydrogen production module and a low-pressure hydrogen storage module, wherein the water electrolysis hydrogen production module is connected to the low-pressure hydrogen storage module through a pipeline, and a positive water seal and a reverse water seal are arranged on the pipeline.

2. The wind-solar hydrogen production system according to claim 1, characterized in that: In the wind-solar hydrogen production system, the photovoltaic power generation module and the wind power generation module are arranged in parallel and connected in series with the water electrolysis hydrogen production module. Preferably, the wind-solar hydrogen production system may further include an electric energy storage module, which is arranged between the photovoltaic power generation module, the wind power generation module and the water electrolysis hydrogen production module, or is arranged within the water electrolysis hydrogen production module. Preferably, the electrical energy storage module is selected from one or more of a gravity energy storage module, a chemical energy storage module and a battery energy storage module.

3. The wind-solar hydrogen production system according to claim 2, characterized in that: A first air inlet is provided at the left end of the top of the positive water seal, and a first air outlet is provided at the right end of the top of the positive water seal; a second air outlet is provided at the left end of the top of the reverse water seal, and a second air inlet is provided at the right end of the top of the reverse water seal; the first air inlet of the positive water seal is connected to the second air outlet of the reverse water seal, and the first air outlet of the positive water seal is connected to the second air inlet of the reverse water seal.

4. The wind-solar hydrogen production system according to any one of claims 1 to 3, characterized in that: A cathode electrode is provided at the top left end of the water electrolysis hydrogen production module, and the cathode electrode is connected to the positive and reverse water seals through pipelines; an anode electrode is provided at the top right end of the water electrolysis hydrogen production module, and the anode electrode is connected to the oxygen collection module through pipelines.

5. The wind-solar hydrogen production system according to claim 4, characterized in that: The low-pressure hydrogen storage module is a hydrogen gas cabinet. Preferably, the low-pressure hydrogen storage module comprises a water storage unit and a closed unit arranged on the upper part of the water storage unit, and the water storage unit and the closed unit are connected by a guide rail; The water storage unit is provided with a third air inlet, and the first air outlet of the positive water seal and the second air inlet of the reverse water seal are respectively connected to the third air inlet through pipelines; A counterweight block is arranged on the top of the closed unit; The water storage unit is provided with a third water replenishment port, a steam inlet, a circulating water inlet, a steam condensate outlet, a drain port, a replacement drain port and a condensate drain port; The closed unit is provided with a replacement port and a venting port.

6. The wind-solar hydrogen production system according to claim 5, characterized in that: The hydrogen storage capacity V of the low-pressure hydrogen storage module is 储 It complies with the following formula (1): V 储 =V h ×24 (1) Among them, V h It is the hydrogen consumption per hour of the downstream hydrogen module.

7. The wind-solar hydrogen production system according to claim 6, characterized in that: The hydrogen production capacity of the water splitting hydrogen production module is V 产 It complies with the following formula (2): V 产 =V 储 / T (2) Wherein, T is the cumulative full-load operation time of the water splitting hydrogen production module. Preferably, the hydrogen outlet pressure of the water electrolysis hydrogen production module is 3-20 kPa; the hydrogen outlet pressure of the low-pressure hydrogen storage module is 2-15 kPa.

8. The wind-solar hydrogen production system according to any one of claims 1 to 3, characterized in that: The wind-solar hydrogen production system also includes a hydrogen compression module, which is connected to the water electrolysis hydrogen production module, the positive water seal and the reverse water seal through pipelines.

9. A method for producing hydrogen from wind and solar power, characterized in that: Including using the above-mentioned wind-solar hydrogen production system to produce hydrogen. Preferably, the electricity generated by the photovoltaic power generation module and the wind power generation module is used as the energy source of the water electrolysis hydrogen production module, the water electrolysis hydrogen production module produces hydrogen and oxygen, and the hydrogen produced by the water electrolysis hydrogen production module is sent to the low-pressure hydrogen storage module for storage through a positive water seal.

10. The method for producing hydrogen from wind and solar power according to claim 9, characterized in that: The steps include: S1. The electricity generated by the photovoltaic power generation module and the wind power generation module supplies power to the water electrolysis hydrogen production module. The water electrolysis hydrogen production module electrolyzes water to produce hydrogen and oxygen. The prepared hydrogen is stored in the low-pressure hydrogen storage module after passing through the positive water seal and the reverse water seal, and / or is compressed by the hydrogen compression module for use by the downstream hydrogen use module; S2. When the power generation of the photovoltaic power generation module and the wind power generation module is greater than the power consumption of the water electrolysis hydrogen production module, the electric energy storage module works to store the excess power generation; S3. When the hydrogen storage in the low-pressure hydrogen storage module is greater than the preset maximum value, it is fed back to the water electrolysis hydrogen production module, and the water electrolysis hydrogen production module stops working or reduces the power, and the excess power generation is stored in the electric energy storage module; S4. When the power generation of the photovoltaic power generation module and the wind power generation module is less than the power consumption of the water electrolysis hydrogen production module, the hydrogen stored in the low-pressure hydrogen storage module is consumed first; when the hydrogen stored in the low-pressure hydrogen storage module is less than the preset minimum value, the electric energy storage module is turned on to supply power to the water electrolysis hydrogen production module. Preferably, in step S1, the hydrogen outlet pressure of the water electrolysis hydrogen production module is 3-20 kPa. Preferably, in step S1, the temperature in the water electrolysis hydrogen production module is controlled at 80-90°C.

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