Fluctuating power supply electrolytic hydrogen production integrated system

Abstract

The invention provides a fluctuating power supply electrolytic hydrogen production integrated system which comprises at least one first electrolytic bath, at least one second electrolytic bath and a power distribution module, wherein the rated power of the first electrolytic cell is smaller than the first power, the rated power of the second electrolytic cell is larger than the second power, the first electrolytic cell and the second electrolytic cell are used for electrolytic hydrogen production, and the second power is larger than the first power; the power input end of the power distribution module is connected with the power output end of the fluctuation power supply, and the power output end of the power distribution module is connected with the power input end of the first electrolytic cell and the power input end of the second electrolytic cell. The power distribution module is used for adjusting the distribution proportion of the output current between the first electrolytic cell and the second electrolytic cell according to the fluctuation frequency of the fluctuation power supply. According to the fluctuating power supply electrolytic hydrogen production integrated system disclosed by the invention, the response speed problem and the efficiency problem of electrolytic hydrogen production under the fluctuating power supply are solved, and quick response and high energy efficiency are realized.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of electrolytic hydrogen production, and particularly relates to a fluctuating power source electrolytic hydrogen production integrated system. BACKGROUND

[0002] Electrolytic hydrogen production is a clean hydrogen production method that uses electrical energy to decompose water into hydrogen and oxygen. Existing electrolytic hydrogen production systems have problems such as response delay and efficiency drop under fluctuating power sources. Traditional solutions rely on external energy storage to smooth fluctuations, but the cost is high and the system is complex. SUMMARY

[0003] The present disclosure aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, the purpose of the present disclosure is to provide a fluctuating power source electrolytic hydrogen production integrated system.

[0005] To achieve the above purpose, the present disclosure provides a fluctuating power source electrolytic hydrogen production integrated system, comprising: at least one first electrolytic cell, at least one second electrolytic cell, and a power distribution module; wherein the rated power of the first electrolytic cell is less than a first power, and the rated power of the second electrolytic cell is greater than a second power, the first electrolytic cell and the second electrolytic cell are respectively used for electrolytic hydrogen production, and the second power is greater than the first power; the power input end of the power distribution module is connected with the power output end of the fluctuating power source, and the power output end of the power distribution module is respectively connected with the power input end of the first electrolytic cell and the power input end of the second electrolytic cell, and the power distribution module is used for adjusting the distribution ratio of the output current between the first electrolytic cell and the second electrolytic cell according to the fluctuation frequency of the fluctuating power source.

[0006] Optionally, the power distribution module is used for increasing the distribution ratio of the output current in the first electrolytic cell and reducing the distribution ratio of the output current in the second electrolytic cell when the fluctuation frequency of the fluctuating power source increases.

[0007] Optionally, the power distribution module is used for increasing the distribution ratio of the output current in the second electrolytic cell and reducing the distribution ratio of the output current in the first electrolytic cell when the fluctuation frequency of the fluctuating power source decreases.

[0008] Optionally, the power distribution module is further used for predicting the fluctuation frequency trend of the fluctuating power source in a future second preset time according to the fluctuation frequency of the fluctuating power source in a past first preset time, and adjusting the distribution ratio of the output current between the first electrolytic cell and the second electrolytic cell according to the predicted fluctuation frequency trend.

[0009] Optionally, the system further comprises a heat storage unit, a heat absorption end of the heat storage unit is connected with a heat release end of the first electrolytic cell and a heat release end of the second electrolytic cell respectively, and the heat storage unit is used for storing waste heat of the first electrolytic cell and the second electrolytic cell; a power generation unit, a heat absorption end of the power generation unit is connected with a heat release end of the heat storage unit, and the power generation unit is used for converting heat energy stored in the heat storage unit into electric energy, and a power output end of the power generation unit is connected with a power input end of the power distribution module.

[0010] Optionally, the power generation unit is used for converting heat energy stored in the heat storage unit into electric energy and delivering the electric energy to the power distribution module when output power of the fluctuating power source is lower than a preset power.

[0011] Optionally, the heat storage unit comprises a low-temperature tank, a high-temperature tank, a first heat exchanger and a second heat exchanger; wherein a first channel of the first heat exchanger is arranged on an outer wall of the first electrolytic cell and is connected with a heat exchange medium, and a second channel of the first heat exchanger is arranged between a medium output end of the low-temperature tank and a medium input end of the high-temperature tank, and the first heat exchanger is used for heating phase change medium from the low-temperature tank to the high-temperature tank by using waste heat of the first electrolytic cell; a first channel of the second heat exchanger is arranged on an outer wall of the second electrolytic cell and is connected with a heat exchange medium, and a second channel of the second heat exchanger is arranged between the medium output end of the low-temperature tank and the medium input end of the high-temperature tank, and the second heat exchanger is used for heating phase change medium from the low-temperature tank to the high-temperature tank by using waste heat of the second electrolytic cell.

[0012] Optionally, the heat storage unit further comprises a first delivery pump, the first delivery pump is arranged at the medium output end of the low-temperature tank, and the first delivery pump is used for delivering phase change medium of the low-temperature tank to the high-temperature tank.

[0013] Optionally, the power generation unit comprises a heat release channel and a plurality of thermoelectric generation pieces, the heat release channel is arranged between a medium output end of the high-temperature tank and a medium input end of the low-temperature tank, and a plurality of the thermoelectric generation pieces are arranged on an outer wall of the heat release channel respectively, and power output ends of the plurality of thermoelectric generation pieces are connected with the power input end of the power distribution module respectively.

[0014] Optionally, the power generation unit further comprises a second delivery pump, the second delivery pump is arranged at the medium output end of the high-temperature tank, and the second delivery pump is used for delivering phase change medium of the high-temperature tank to the low-temperature tank.

[0015] The technical scheme provided by the present disclosure can include the following beneficial effects: Because the power input terminal of the power distribution module is connected to the power output terminal of the fluctuating power supply, and the power output terminal of the power distribution module is connected to the power input terminals of the first electrolytic cell and the second electrolytic cell respectively, the fluctuating power supply can use the power distribution module to supply power to the first electrolytic cell with a smaller rated power and the second electrolytic cell with a larger rated power. Furthermore, the power distribution module adjusts the distribution ratio of the output current between the first electrolytic cell and the second electrolytic cell according to the fluctuation frequency of the fluctuating power supply, thereby adapting to the fluctuation current of the fluctuating power supply by coordinating the first electrolytic cell and the second electrolytic cell, thus solving the response speed and efficiency problems of electrolytic hydrogen production under fluctuating power supply, and achieving fast response and high energy efficiency.

[0016] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a circuit diagram of an integrated system for producing hydrogen by electrolysis using fluctuating power supply, according to an embodiment of this disclosure. Figure 2 This is a schematic diagram of the structure of the thermal storage unit and the power generation unit in an integrated system for electrolytic hydrogen production using fluctuating power sources, according to an embodiment of this disclosure. As shown in the figure: 1. First electrolytic cell, 2. Second electrolytic cell, 3. Power distribution module, 4. Fluctuation power supply; 5. Thermal storage unit; 51. Low temperature tank; 52. High temperature tank; 53. First heat exchanger; 54. Second heat exchanger; 55. First transfer pump; 6. Power generation unit; 61. Heat release channel; 62. Thermoelectric generator; 63. Second delivery pump. Detailed Implementation

[0018] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are used only to explain this disclosure, and should not be construed as limiting this disclosure. Rather, embodiments of this disclosure include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0019] like Figure 1As shown in the embodiment of this disclosure, an integrated system for hydrogen production by electrolysis using a fluctuating power supply 4 is proposed, comprising: at least one first electrolyzer 1, at least one second electrolyzer 2, and a power distribution module 3. The rated power of the first electrolyzer 1 is less than a first power, and the rated power of the second electrolyzer 2 is greater than a second power. The first electrolyzer 1 and the second electrolyzer 2 are used for hydrogen production by electrolysis, with the second power being greater than the first power. The power input terminal of the power distribution module 3 is connected to the power output terminal of the fluctuating power supply 4, and the power output terminal of the power distribution module 3 is connected to the power input terminals of the first electrolyzer 1 and the second electrolyzer 2, respectively. The power distribution module 3 is used to adjust the distribution ratio of the output current between the first electrolyzer 1 and the second electrolyzer 2 according to the fluctuation frequency of the fluctuating power supply 4.

[0020] It is understandable that, since the power input terminal of the power distribution module 3 is connected to the power output terminal of the fluctuating power supply 4, and the power output terminal of the power distribution module 3 is connected to the power input terminals of the first electrolytic cell 1 and the second electrolytic cell 2 respectively, the fluctuating power supply 4 can use the power distribution module 3 to supply power to the first electrolytic cell 1 with a smaller rated power and the second electrolytic cell 2 with a larger rated power. Furthermore, the power distribution module 3 adjusts the distribution ratio of the output current between the first electrolytic cell 1 and the second electrolytic cell 2 according to the fluctuation frequency of the fluctuating power supply 4, thereby adapting to the fluctuating current of the fluctuating power supply 4 by cooperating with the first electrolytic cell 1 and the second electrolytic cell 2, thereby solving the response speed and efficiency problems of electrolytic hydrogen production under the fluctuating power supply 4, and achieving fast response and high energy efficiency.

[0021] It should be noted that the first electrolytic cell 1 and the second electrolytic cell 2 are arranged in parallel. The first electrolytic cell 1, with its smaller rated power, has a shorter response time and a faster response speed, while the second electrolytic cell 2, with its larger rated power, has a longer response time and a slower response speed. Based on this, for example, the first electrolytic cell 1 can be a PEM (proton exchange membrane) type electrolytic cell (rated power 10kW, response time 50ms) to handle the high-frequency fluctuations of the fluctuating power supply 4, and the second electrolytic cell 2 can be an ALK (alkaline) type electrolytic cell (rated power 50kW, response time 2s) to handle the steady-state current of the fluctuating power supply 4.

[0022] The power distribution module 3 is used for current distribution. For example, the power distribution module 3 distributes the current based on the fluctuation frequency of the power supply (0.1Hz-10Hz) so that the first electrolytic cell 1 can cope with the high-frequency fluctuations of the fluctuating power supply 4, and the second electrolytic cell 2 can cope with the low-frequency fluctuations of the fluctuating power supply 4. The specific type of the power distribution module 3 can be set according to actual needs and is not limited thereto. For example, the power distribution module 3 can be an integrated circuit, chip, etc. that implements the power distribution function.

[0023] Among them, the power distribution module 3 can calculate the optimal current distribution ratio in real time based on the current density-efficiency curve when distributing current, ensuring that the overall efficiency is ≥85%.

[0024] The fluctuating power source 4 can be a wind power system for generating wind power or a photovoltaic system for generating photovoltaic power; there are no restrictions on this. For example, the power of the fluctuating power source 4 is 0kW-100kW, and the fluctuating frequency is 0.5Hz-5Hz.

[0025] In some embodiments, the power distribution module 3 is used to increase the distribution ratio of the output current in the first electrolytic cell 1 and decrease the distribution ratio of the output current in the second electrolytic cell 2 when the fluctuation frequency of the fluctuating power supply 4 increases.

[0026] It is understandable that when the fluctuation frequency of the power supply 4 increases, the power distribution module 3 increases the proportion of the output current distributed in the first electrolytic cell 1 and decreases the proportion of the output current distributed in the second electrolytic cell 2, thereby utilizing the first electrolytic cell 1 with its smaller rated power and faster response speed to cope with the high-frequency fluctuations of the power supply 4, thus achieving fast response and high energy efficiency.

[0027] In some embodiments, the power distribution module 3 is used to increase the distribution ratio of the output current in the second electrolytic cell 2 and decrease the distribution ratio of the output current in the first electrolytic cell 1 when the fluctuation frequency of the fluctuating power supply 4 decreases.

[0028] It is understandable that when the fluctuation frequency of the power supply 4 decreases, the power distribution module 3 increases the proportion of the output current distributed in the second electrolytic cell 2 and decreases the proportion of the output current distributed in the first electrolytic cell 1. In this way, the second electrolytic cell 2, which has a larger rated power and a slower response speed, can be used to deal with the low-frequency fluctuation of the power supply 4, thereby achieving fast response and high energy efficiency.

[0029] In some embodiments, the power distribution module 3 is further configured to predict the fluctuation frequency trend of the fluctuation power supply 4 in the future second preset time period based on the fluctuation frequency of the fluctuation power supply 4 in the past first preset time period, and to adjust the distribution ratio of the output current between the first electrolytic cell 1 and the second electrolytic cell 2 according to the predicted fluctuation frequency trend.

[0030] Understandably, based on the fluctuation frequency of the power supply 4 in the first preset time period, the power distribution module 3 predicts the fluctuation frequency trend of the power supply 4 in the second preset time period in the future, and adjusts the distribution ratio of the output current between the first electrolytic cell 1 and the second electrolytic cell 2 according to the predicted fluctuation frequency trend, thereby realizing fluctuation prediction and pre-adjustment, and further improving system performance.

[0031] For example, the power distribution module 3 predicts the fluctuation frequency trend for the next 10 seconds based on the fluctuation frequency (historical data) of the fluctuating power supply 4 within the first preset time period, so as to adjust the electrolyzer load in advance.

[0032] like Figure 2 As shown, in some embodiments, the system further includes a heat storage unit 5 and a power generation unit 6. The heat absorption end of the heat storage unit 5 is connected to the heat release end of the first electrolytic cell 1 and the heat release end of the second electrolytic cell 2, respectively. The heat storage unit 5 is used to store the waste heat of the first electrolytic cell 1 and the second electrolytic cell 2. The heat absorption end of the power generation unit 6 is connected to the heat release end of the heat storage unit 5. The power generation unit 6 is used to convert the thermal energy stored in the heat storage unit 5 into electrical energy. The power output end of the power generation unit 6 is connected to the power input end of the power distribution module 3.

[0033] Understandably, since the heat absorption end of the heat storage unit 5 is connected to the heat release end of the first electrolytic cell 1 and the second electrolytic cell 2 respectively, and the heat absorption end of the power generation unit 6 is connected to the heat release end of the heat storage unit 5, and the power output end of the power generation unit 6 is connected to the power input end of the power distribution module 3, the heat storage unit 5 can store the waste heat of the first electrolytic cell 1 and the second electrolytic cell 2, and the power generation unit 6 can convert the heat energy stored in the heat storage unit 5 into electrical energy and transmit it to the power distribution module 3. This achieves waste heat storage and power generation in the first electrolytic cell 1 and the second electrolytic cell 2, thereby reducing energy consumption and improving system efficiency.

[0034] It should be noted that the heat storage unit 5 is used to store the waste heat of the first electrolytic cell 1 and the second electrolytic cell 2. The specific type of the heat storage unit 5 can be set according to actual needs, and there are no restrictions on it.

[0035] The power generation unit 6 is used to convert the thermal energy stored in the thermal storage unit 5 into electrical energy. The specific type of the power generation unit 6 can be set according to actual needs and there are no restrictions on it.

[0036] In some embodiments, the power generation unit 6 is used to convert the thermal energy stored in the thermal storage unit 5 into electrical energy and deliver it to the power distribution module 3 when the output power of the fluctuating power supply 4 is lower than the preset power.

[0037] It is understandable that when the output power of the fluctuating power supply 4 is lower than the preset power, the power output by the fluctuating power supply 4 cannot meet the electrolysis operation of the first electrolytic cell 1 and the second electrolytic cell 2. At this time, the power generation unit 6 converts the heat energy stored in the heat storage unit 5 into electrical energy and sends it to the power distribution module 3, thereby using waste heat recovery and power generation to achieve stable operation of the first electrolytic cell 1 and the second electrolytic cell 2.

[0038] like Figure 2As shown, in some embodiments, the heat storage unit 5 includes: a low-temperature tank 51, a high-temperature tank 52, a first heat exchanger 53, and a second heat exchanger 54. The first heat exchanger 53 has a first channel that surrounds the outer wall of the first electrolytic cell 1 and carries a heat exchange medium, and a second channel that is located between the medium output end of the low-temperature tank 51 and the medium input end of the high-temperature tank 52. The first heat exchanger 53 is used to heat the phase change medium from the low-temperature tank 51 to the high-temperature tank 52 using the waste heat of the first electrolytic cell 1. The second heat exchanger 54 has a first channel that surrounds the outer wall of the second electrolytic cell 2 and carries a heat exchange medium, and a second channel that is located between the medium output end of the low-temperature tank 51 and the medium input end of the high-temperature tank 52. The second heat exchanger 54 is used to heat the phase change medium from the low-temperature tank 51 to the high-temperature tank 52 using the waste heat of the second electrolytic cell 2.

[0039] It is understandable that, since the first channel of the first heat exchanger 53 is arranged around the outer wall of the first electrolytic cell 1 and the heat exchange medium is introduced, and the second channel of the first heat exchanger 53 is arranged between the medium output end of the low temperature tank 51 and the medium input end of the high temperature tank 52, the waste heat of the first electrolytic cell 1 can be transferred to the phase change medium transported from the low temperature tank 51 to the high temperature tank 52 through the first channel and the second channel of the first heat exchanger 53, thereby realizing the waste heat recovery of the first electrolytic cell 1.

[0040] Since the first channel of the second heat exchanger 54 is arranged around the outer wall of the second electrolytic cell 2 and the heat exchange medium is introduced into it, and the second channel of the second heat exchanger 54 is arranged between the medium output end of the low temperature tank 51 and the medium input end of the high temperature tank 52, the waste heat of the second electrolytic cell 2 can be transferred to the phase change medium transported from the low temperature tank 51 to the high temperature tank 52 through the first and second channels of the second heat exchanger 54, thereby realizing the waste heat recovery of the second electrolytic cell 2.

[0041] It should be noted that the cryogenic tank 51 is used to store cryogenic phase change media, and the high-temperature tank 52 is used to store high-temperature phase change media. The specific types of cryogenic tank 51 and high-temperature tank 52 can be set according to actual needs, and there are no restrictions on them.

[0042] The phase change medium can be paraffin, graphite composite materials, etc., and there are no restrictions on this.

[0043] The first heat exchanger 53 is used for heat exchange between the first electrolytic cell 1 and the phase change medium, and the second heat exchanger 54 is used for heat exchange between the second electrolytic cell 2 and the phase change medium. The specific types of the first heat exchanger 53 and the second heat exchanger 54 can be set according to actual needs, and there are no restrictions on this.

[0044] The distribution of the phase change medium between the second channel of the first heat exchanger 53 and the second channel of the second heat exchanger 54 can be achieved using switching valves, regulating valves, etc.

[0045] like Figure 2 As shown, in some embodiments, the thermal storage unit 5 further includes a first delivery pump 55, which is disposed at the medium output end of the low-temperature tank 51 and is used to deliver the phase change medium of the low-temperature tank 51 to the high-temperature tank 52.

[0046] It is understandable that, since the first transfer pump 55 is located at the medium output end of the cryogenic tank 51, the first transfer pump 55 can transfer the cryogenic phase change medium in the cryogenic tank 51 to the high-temperature tank 52. Furthermore, when the cryogenic phase change medium passes through the second channel of the first heat exchanger 53, it can absorb the waste heat of the first electrolytic cell 1. And when the cryogenic phase change medium passes through the second channel of the second heat exchanger 54, it can absorb the waste heat of the second electrolytic cell 2.

[0047] It should be noted that the first transfer pump 55 is used to transfer the phase change medium from the cryogenic tank 51 to the high-temperature tank 52. The specific type of the first transfer pump 55 can be set according to actual needs and there are no restrictions on it.

[0048] like Figure 2 As shown, in some embodiments, the power generation unit 6 includes: a heat dissipation channel 61 and a plurality of thermoelectric generators 62. The heat dissipation channel 61 is disposed between the medium output end of the high temperature tank 52 and the medium input end of the low temperature tank 51, and the plurality of thermoelectric generators 62 are respectively disposed on the outer wall of the heat dissipation channel 61. The power output ends of the plurality of thermoelectric generators 62 are respectively connected to the power input ends of the power distribution module 3.

[0049] Understandably, since the heat release channel 61 is located between the medium output end of the high-temperature tank 52 and the medium input end of the low-temperature tank 51, the high-temperature phase change medium in the high-temperature tank 52 can be transported to the low-temperature tank 51 via the heat release channel 61. Furthermore, since multiple thermoelectric generators 62 are respectively located on the outer wall of the heat release channel 61, and the power output ends of the multiple thermoelectric generators 62 are respectively connected to the power input ends of the power distribution module 3, the thermoelectric generators 62 can utilize the heat of the phase change medium in the heat release channel 61 to generate electricity through thermoelectric difference, and transmit the generated electrical energy to the power distribution module 3, thereby ensuring the stable operation of the first electrolytic cell 1 and the second electrolytic cell 2.

[0050] It should be noted that the heat release channel 61 is used to transport the high-temperature phase change medium, and the thermoelectric generator 62 is used to generate electricity by utilizing the temperature difference between the heat release channel 61 and the external environment. The specific types of the heat release channel 61 and the thermoelectric generator 62 can be set according to actual needs, and there are no restrictions on them.

[0051] like Figure 2As shown, in some embodiments, the power generation unit 6 further includes a second delivery pump 63, which is disposed at the medium output end of the high-temperature tank 52 and is used to deliver the phase change medium of the high-temperature tank 52 to the low-temperature tank 51.

[0052] Understandably, since the second transfer pump 63 is located at the medium output end of the high-temperature tank 52, the second transfer pump 63 can transport the high-temperature phase change medium in the high-temperature tank 52 to the low-temperature tank 51. Furthermore, when the high-temperature phase change medium passes through the heat release channel 61, it can release heat to the thermoelectric generator 62, thereby achieving power generation for self-use.

[0053] It should be noted that the second transfer pump 63 is used to transfer the phase change medium from the high-temperature tank 52 to the low-temperature tank 51. The specific type of the second transfer pump 63 can be set according to actual needs and there are no restrictions on it.

[0054] The system in this embodiment solves the contradiction between efficiency and response speed under fluctuating power supply by integrating the design of "multi-stage electrolyzer coordinated response + intelligent predictive control + thermal-electric self-sustaining cycle", reducing the dependence on external energy storage and providing a highly robust solution for direct hydrogen production from renewable energy.

[0055] Based on the system in this embodiment, the response speed of electrolytic hydrogen production is improved to the millisecond level (traditional system ≥ 1 second), the comprehensive efficiency under fluctuating operating conditions is ≥ 88% (traditional system ≤ 70%), and the system self-sufficiency rate (waste heat power generation ratio) reaches 15%.

[0056] Example: One PEM electrolytic cell (first electrolytic cell 1, rated power 10kW, response time 50ms) and two ALK electrolytic cells (second electrolytic cell 2, rated power 50kW, response time 2s) are arranged. The power supply simulates wind and solar fluctuations (0kW-100kW, fluctuation frequency 0.5Hz-5Hz) and is dynamically adjusted by the power distribution module 3. The waste heat power generation module recovers waste heat at 80℃ and generates 1.5kW of power through temperature difference.

[0057] Results: The overall system efficiency is 89%, the response time is ≤100ms, and the waste heat power generation meets 15% of the power consumption of auxiliary equipment.

[0058] First comparative example: a single ALK electrolyzer system, under the same fluctuation, the efficiency drops to 68%, and the response time is >2 seconds.

[0059] The second comparison: without waste heat recovery (without thermal storage unit 5 and power generation unit 6), the system self-sufficiency rate is only 5%, and the overall efficiency is 85%.

[0060] It should be noted that in the description of this disclosure, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0061] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. An integrated system for hydrogen production via electrolysis using fluctuating power supply, characterized in that, include: At least one first electrolytic cell, at least one second electrolytic cell, and a power distribution module; Wherein, the rated power of the first electrolytic cell is less than the first power, and the rated power of the second electrolytic cell is greater than the second power. The first electrolytic cell and the second electrolytic cell are used for electrolytic hydrogen production, and the second power is greater than the first power. The power input terminal of the power distribution module is connected to the power output terminal of the fluctuating power supply, and the power output terminal of the power distribution module is connected to the power input terminal of the first electrolytic cell and the power input terminal of the second electrolytic cell respectively. The power distribution module is used to adjust the distribution ratio of the output current between the first electrolytic cell and the second electrolytic cell according to the fluctuation frequency of the fluctuating power supply.

2. The integrated system for hydrogen production by electrolysis using fluctuating power supply according to claim 1, characterized in that, The power distribution module is used to increase the distribution ratio of the output current in the first electrolytic cell and decrease the distribution ratio of the output current in the second electrolytic cell when the fluctuation frequency of the fluctuating power supply increases.

3. The integrated system for hydrogen production by electrolysis using fluctuating power supply according to claim 1, characterized in that, The power distribution module is used to increase the proportion of output current distributed in the second electrolytic cell and decrease the proportion of output current distributed in the first electrolytic cell when the fluctuation frequency of the fluctuating power supply decreases.

4. The integrated system for hydrogen production via electrolysis using fluctuating power supply according to claim 1, characterized in that, The power distribution module is also used to predict the fluctuation frequency trend of the power supply in the future in the second preset time period based on the fluctuation frequency of the power supply in the past first preset time period, and to adjust the distribution ratio of the output current between the first electrolytic cell and the second electrolytic cell according to the predicted fluctuation frequency trend.

5. The integrated system for hydrogen production by electrolysis using fluctuating power supply according to claim 1, characterized in that, The system also includes: A heat storage unit, wherein the heat absorption end of the heat storage unit is connected to the heat release end of the first electrolytic cell and the heat release end of the second electrolytic cell respectively, and the heat storage unit is used to store the waste heat of the first electrolytic cell and the second electrolytic cell. The power generation unit has its heat absorption end connected to the heat release end of the heat storage unit, and the power generation unit is used to convert the thermal energy stored in the heat storage unit into electrical energy. The power output end of the power generation unit is connected to the power input end of the power distribution module.

6. The integrated system for hydrogen production by electrolysis using fluctuating power supply according to claim 5, characterized in that, The power generation unit is used to convert the thermal energy stored in the thermal storage unit into electrical energy and deliver it to the power distribution module when the output power of the fluctuating power supply is lower than the preset power.

7. The integrated system for hydrogen production by electrolysis using fluctuating power supply according to claim 5, characterized in that, The thermal storage unit includes: Low-temperature tank, high-temperature tank, first heat exchanger and second heat exchanger; The first heat exchanger has a first channel that is wound around the outer wall of the first electrolytic cell and carries a heat exchange medium, and the second channel of the first heat exchanger is located between the medium output end of the low-temperature tank and the medium input end of the high-temperature tank. The first heat exchanger is used to heat the phase change medium from the low-temperature tank to the high-temperature tank using the waste heat of the first electrolytic cell. The first channel of the second heat exchanger is arranged around the outer wall of the second electrolytic cell and a heat exchange medium is introduced into it. The second channel of the second heat exchanger is arranged between the medium output end of the low-temperature tank and the medium input end of the high-temperature tank. The second heat exchanger is used to heat the phase change medium from the low-temperature tank to the high-temperature tank using the waste heat of the second electrolytic cell.

8. The integrated system for hydrogen production by electrolysis using fluctuating power supply according to claim 7, characterized in that, The thermal storage unit also includes: A first delivery pump is disposed at the medium output end of the cryogenic tank and is used to deliver the phase change medium of the cryogenic tank to the high-temperature tank.

9. The integrated system for hydrogen production by electrolysis using fluctuating power supply according to claim 7, characterized in that, The power generation unit includes: The system includes a heat release channel and multiple thermoelectric generators. The heat release channel is located between the medium output end of the high-temperature tank and the medium input end of the low-temperature tank. The multiple thermoelectric generators are respectively located on the outer wall of the heat release channel, and the power output ends of the multiple thermoelectric generators are respectively connected to the power input end of the power distribution module.

10. The integrated system for hydrogen production by electrolysis using fluctuating power supply according to claim 9, characterized in that, The power generation unit also includes: A second delivery pump is installed at the medium output end of the high-temperature tank and is used to deliver the phase change medium from the high-temperature tank to the low-temperature tank.

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