Methanol electrolysis hydrogen production system for water-wind-light multi-energy fluctuating source network of oil and gas field

Abstract

The invention provides an oil and gas field water-wind-light multi-energy fluctuating source network methanol electrolysis hydrogen production system, and relates to the technical field of oil and gas fields, the system comprises a processor, a water-wind-light power generation module, a frequency domain decomposition module, an electrolytic cell module, a methanol hydrogen storage and regeneration module, an energy storage device and a bidirectional inverter; the water-wind-light power generation module automatically adjusts the operation mode of power generation equipment based on the acquired meteorological data and hydrological data, and realizes power distribution through complementary power generation in the anti-fluctuation aspect; the frequency domain decomposition module divides the fluctuation input current according to frequency based on a wavelet packet decomposition algorithm and performs matching; the bidirectional inverter is used for converting direct current into alternating current, transmitting the alternating current to a power grid and transmitting redundant electric energy to the energy storage equipment for storage. The invention solves the problems of low efficiency, high energy consumption, short service life and insufficient safety of an electrolytic cell and an electrolytic hydrogen production method in the prior art under the condition of high fluctuation input of renewable energy sources.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas fields, and in particular to a system for electrolyzing methanol to produce hydrogen with a multi-energy fluctuating source network of water, wind, and light in an oil and gas field. Background Art

[0002] Under the background of the low-carbon transformation of the global energy structure, traditional oil and gas field energy bases represented by Sichuan Province are facing unique transformation opportunities and challenges. This region has both rich water energy, wind energy, and photovoltaic resources and mature natural gas oil and gas field infrastructure, providing unique conditions for constructing a "water-wind-light-gas-hydrogen" multi-energy collaborative system. However, the uncertainty and intermittency of wind and light resources in the Sichuan Basin are in sharp contradiction with the rigid operation characteristics of traditional oil and gas field power grids dominated by gas turbines. After the access of wind and light energy, it is difficult to match the load demand due to volatility, seriously restricting the improvement of energy comprehensive utilization efficiency. In addition, although hydrogen energy is regarded as the ultimate clean energy carrier, traditional alkaline water electrolysis for hydrogen production has high energy consumption at high potentials, and its electrolyzer equipment generally faces efficiency loss and life reduction problems when dealing with second-level power fluctuations. To address the above problems, an electrolyzer and an electrolytic hydrogen production method suitable for wide-range power fluctuations need to be designed to improve hydrogen production efficiency, reduce energy consumption, and extend equipment life. Summary of the Invention

[0003] The purpose of the present invention is to provide a system for electrolyzing methanol to produce hydrogen with a multi-energy fluctuating source network of water, wind, and light in an oil and gas field, which solves the problems of low efficiency, high energy consumption, short life, and insufficient safety of the electrolyzer and electrolytic hydrogen production method in the prior art under the highly fluctuating input of renewable energy.

[0004] Technical Solution of the Present Invention:

[0005] The present invention provides a system for electrolyzing methanol to produce hydrogen with a multi-energy fluctuating source network of water, wind, and light in an oil and gas field. The system includes a processor and further includes: a water-wind-light power generation module, a frequency-domain decomposition module, an electrolyzer module, a methanol hydrogen storage and regeneration module, an energy storage device, and a bidirectional inverter, which are data-connected to the processor; wherein:

[0006] The water-wind-light power generation module automatically adjusts the operation mode of the power generation equipment based on the obtained meteorological data and hydrological data, and realizes power distribution through complementary power generation in terms of anti-volatility;

[0007] The frequency-domain decomposition module divides the fluctuating input current into high-frequency, medium-frequency, and low-frequency components according to frequency based on the wavelet packet decomposition algorithm, and matches the currents in different frequency bands;

[0008] The electrolyzer module performs circuit configuration based on a programmable connector;

[0009] The methanol hydrogen storage and regeneration module is used for collecting hydrogen, recycling the electrolyte, and reusing the solution;

[0010] The energy storage device is used for electrically connecting with the methanol hydrogen storage and regeneration module;

[0011] The bidirectional inverter is used for converting direct current into alternating current and transmitting it to the power grid, and transmitting the excess electric energy to the energy storage device for storage.

[0012] Further, the water-wind-solar power generation module includes a water-wind-solar complementary controller and a wind power generation group, a photovoltaic power generation group, and a hydraulic power generation group that are electrically connected to the water-wind-solar complementary controller; the wind power generation group and the photovoltaic power generation group are used for capturing wind energy and solar energy and outputting fluctuating direct current; the hydraulic power generation group drives a water turbine to rotate based on the potential energy and kinetic energy of the water flow, and then drives a generator to generate electricity; the water-wind-solar complementary controller is used for monitoring the operating states of the wind power generation group, the photovoltaic power generation group, and the hydraulic power generation group.

[0013] Further, the frequency domain decomposition module includes a rectifier and a current distribution unit.

[0014] Further, the electrolyzer module includes a methanol electrolyzer module, a PEM electrolyzer module, an AEM electrolyzer module, and an independent electronic power switch; the methanol electrolyzer module includes a cathode catalytic module, an anode catalytic module, a plate module, and an end plate.

[0015] Further, the methanol hydrogen storage and regeneration module includes an electrolyte circulation device, a circulation pump, an electrolyzer, a gas-liquid separator, a flow meter, a hydrogen storage tank, a pressure balance tank, and a methanol hydrogen storage device; the circulation pump, the gas-liquid separator, the hydrogen storage tank, and the pressure balance tank are connected, the flow meter is connected to the pipeline of the gas-liquid separator, and the gas-liquid separator is connected to the electrolyte circulation device; the methanol hydrogen storage device is used for collecting the generated hydrogen.

[0016] Further, the bidirectional inverter is electrically connected to the water-wind-solar complementary controller.

[0017] Further, the system further includes an energy management module, and the energy management module is electrically connected to the methanol hydrogen storage device.

[0018] According to the above technical features, the beneficial effects of the present invention are as follows: The hydrogen production system provided by the present invention can effectively utilize oil and gas field resources, realize diversified energy supply, improve energy utilization efficiency, and enhance the stability and economy of the power grid through efficient intelligent energy management, storage, and power grid regulation technologies, realize the optimal distribution of internal energy in oil and gas fields, improve the stability of the energy system, and solve the problems of low efficiency, high energy consumption, short lifespan, and insufficient safety of electrolyzers and electrolytic hydrogen production methods in the prior art under the highly fluctuating input of renewable energy. Description of the Drawings

[0019] Figure 1 is a structural schematic diagram of the present invention;

[0020] Figure 2 is a schematic diagram of the principle of the present invention;

[0021] Figure 3 is a schematic diagram of the series connection of electrolyzer modules in the present invention;

[0022] Figure 4 is a schematic diagram of the parallel connection of electrolyzer modules in the present invention;

[0023] Figure 5 is a structural schematic diagram of the electrolyzer for hydrogen production by electrolyzing methanol in the present invention. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment

[0026] An embodiment of the present application provides an oil and gas field water-wind-solar multi-energy fluctuating source-network electrolytic methanol hydrogen production system, and this system is executed by a processor.

[0027] The processor may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.; the general-purpose processor may be a microprocessor or this processor may also be any conventional processor, etc.

[0028] Furthermore, in combination with Figures 1-5 , this system further includes: a water-wind-solar power generation module, a frequency-domain decomposition module, an electrolyzer module, a methanol hydrogen storage and regeneration module, an energy storage device, and a bidirectional inverter that are data-connected to the processor; wherein:

[0029] Based on the acquired meteorological data and hydrological data, the water-wind-solar power generation module automatically adjusts the operation mode of the power generation equipment, and realizes power distribution through complementary power generation in terms of anti-fluctuation;

[0030] The frequency-domain decomposition module divides the fluctuating input current into high-frequency, medium-frequency, and low-frequency components according to frequency based on the wavelet packet decomposition algorithm, and matches the currents in different frequency bands;

[0031] The electrolyzer module performs circuit configuration based on a programmable connector;

[0032] The methanol hydrogen storage and regeneration module is used to collect hydrogen, recycle the electrolyte, and reuse the solution;

[0033] The energy storage device is used to be electrically connected to the methanol hydrogen storage and regeneration module;

[0034] The bidirectional inverter is used to convert direct current into alternating current and transmit it to the power grid, and transmit the excess electric energy to the energy storage device for storage.

[0035] It should be noted that the hydrogen production system provided by the embodiment of the present invention is configured with a water-wind-solar power generation module, a frequency-domain decomposition module, an electrolyzer module, a methanol hydrogen storage and regeneration module, an energy storage device, and a bidirectional inverter. Among them, by designing the bidirectional inverter to be connected to the water-wind-solar controller, direct current is converted into alternating current and transmitted to the power grid, while the excess electric energy is transmitted to the energy storage device for storage; among them, the meteorological data acquired by the water-wind-solar power generation module at least includes wind speed and light intensity, and the hydrological data at least includes water level and water flow velocity. The water-wind-solar power generation module can automatically adjust the operation mode of each power generation device to achieve the optimal distribution of power; among them, the frequency-domain decomposition module divides the fluctuating input current into high-frequency, medium-frequency, and low-frequency components according to frequency through the wavelet packet decomposition algorithm, and matches the currents in different frequency bands to different electrolyzer modules through independent electronic power switches; among them, as Figure 3 and Figure 4 shown, the connection and disconnection of the circuit between the electrolyzer modules are realized by means of a programmable connector, realizing flexible circuit configuration without manual operation to set the connection and disconnection timing, sequence, and method of the connector to meet the requirements of different application scenarios, realizing series or parallel connection, improving the flexibility and accuracy of connection and disconnection, supporting both series connection to increase the system voltage and parallel connection to increase the current output, and being able to perform independent access or disconnection operations on a single electrolyzer. Further, by using a topology controller, according to the power input fluctuation characteristics and the electrolyzer state, the electrical connection mode (series / parallel) of the electrolyzer cluster is adjusted to optimize the distribution of fluctuating current.

[0036] The hydrogen production system provided by this embodiment can effectively utilize oil and gas field resources, achieve diversified energy supply, improve energy utilization efficiency, enhance the stability and economy of the power grid through efficient energy management, storage and power grid regulation technologies, realize the optimal allocation of internal energy in oil and gas fields, improve the stability of the energy system, and solve the problems of low efficiency, high energy consumption, short lifespan and insufficient safety of electrolyzers and electrolytic hydrogen production methods in the prior art under the highly volatile input of renewable energy.

[0037] Specifically, in a certain wind farm, due to frequent wind speed mutations, the proportion of high-frequency components in the input current reaches 35%. The traditional alkaline electrolyzer shuts down due to frequent triggering, and the annual effective hydrogen production operation time is less than 60%. By using the hydrogen production system provided by this embodiment and adopting the wavelet packet algorithm, the high-frequency part is switched to the PEM electrolyzer to match the photovoltaic transient fluctuations. The electronic power switch uses a full SiC module (switching delay < 20 μs), and the low-frequency part is switched to the methanol electrolyzer. The CC@NiCoS / Fe anode catalyst is used, and the Faraday efficiency of methanol oxidation can reach 98.5% at 1.35 V vs. RHE. The hydrogen production rate is increased by 2.3 times compared with the traditional catalyst, realizing stable hydrogen production at low potentials and simultaneously co-producing formic acid. When the wind speed mutates, the PEM module switches to the parallel mode. During the low-wind period at night, the methanol modules operate in series to match the power grid peak shaving requirements, resulting in an annual hydrogen production operation time as high as 95%, and the operation lifespan of the electrolyzer is effectively extended.

[0038] Furthermore, the water-wind-solar power generation module includes a water-wind-solar complementary controller and a wind power generation group, a photovoltaic power generation group, and a hydraulic power generation group that are electrically connected to the water-wind-solar complementary controller; the wind power generation group and the photovoltaic power generation group are used to capture wind energy and solar energy and output fluctuating direct current; the hydraulic power generation group uses the potential energy and kinetic energy of water flow to drive the water turbine to rotate, and then drives the generator to generate electricity; the water-wind-solar complementary controller is used to monitor the operating states of the wind power generation group, the photovoltaic power generation group, and the hydraulic power generation group.

[0039] It should be noted that the wind power generation group and the photovoltaic power generation group can be complementary in time. When there is sufficient sunlight during the day, the photovoltaic power generation group can undertake the main power generation task. While at night or on cloudy days, the wind power generation group can supplement the deficiencies of photovoltaic power generation. This complementarity can reduce the impact of the volatility of single-energy power generation on the power grid. The hydropower generation group can be adjusted according to the water flow and water level changes of the river, and has good stability and predictability. When the wind power generation group and the photovoltaic power generation group have insufficient power generation, the hydropower generation group can be used as a supplement to provide stable power output. Therefore, the wind power generation group, the photovoltaic power generation group, and the hydropower generation group can interact with each other in terms of anti-volatility through complementary power generation, energy storage and regulation, increasing system flexibility, and optimizing economy. In addition, the water-wind-solar complementary controller is connected to the wind power generation group, the photovoltaic power generation group, and the hydropower generation group, and can flexibly switch the main power generation method according to real-time data and prediction models under different weather conditions. For example, during the day, the photovoltaic power generation group is given priority to generate power, and at night or on cloudy days, it switches to the wind power generation group or the hydropower generation group to generate power, improving the stability, efficiency, and reliability of the renewable energy system.

[0040] Furthermore, the water-wind-solar complementary controller monitors key parameters such as the power output, voltage, current, wind power, and photovoltaic power of the wind power generation group, the photovoltaic power generation group, and the hydropower generation group to judge their operating states.

[0041] Furthermore, the frequency domain decomposition module includes a rectifier and a current distribution unit.

[0042] Furthermore, the electrolyzer module includes a methanol electrolyzer module, a PEM electrolyzer module, an AEM electrolyzer module, and an independent electronic power switch; the methanol electrolyzer module includes a cathode catalytic module, an anode catalytic module, a plate module, and an end plate. The cathode catalyst configured in the cathode catalytic module uses commercial Pt / C, and the anode catalyst configured in the anode catalytic module is CC@NiCoS / Fe. Specifically, as Figure 5 shown, for the anode catalyst CC@NiCoS / Fe, the main synthesis steps using the one-step electrodeposition method are as follows: First, pretreat the carbon cloth by immersing the carbon cloth in dilute nitric acid, and then transfer it to a stainless steel autoclave for hydrothermal treatment at 120 °C for 24 hours; Second, use the pretreated carbon cloth as the working electrode, a platinum sheet as the counter electrode, and Ag / AgCl as the reference electrode. A 4 mM NiCl2, 4 mM CoCl2, 0.5 mM FeCl3 (trace Fe doping), 0.1 M KCl, 0.75 M thiourea aqueous solution is used as the solvent. Finally, perform cyclic voltammetry (CV) scanning 20 times using the electrodeposition method, with the voltage range from -1.2 to 0.2 V (vs. Ag / AgCl) and the scanning rate of 30 mV / s; Wash the electrodeposited sample with deionized water and ethanol, and then dry it in vacuum at 40 °C for 12 hours to obtain CC@NiCoS / Fe.

[0043] Furthermore, in the electrolyzer module of this embodiment, during the hydrogen production process, a one-step electrodeposition method is used to directly grow porous NiCoS / Fe nanosheets on carbon cloth as the anode catalyst for electrolytic methanol hydrogen production. In alkaline MOR, the d-band centers of Ni and Co can be adjusted by trace Fe doping, optimizing the adsorption energy of methanol molecules, reducing the MOR energy barrier, and the porous structure exposes more active sites during the reaction, accelerating the diffusion of methanol molecules and OH - , providing an efficient anode material for a low-energy-consuming and highly stable methanol hydrogen production system. The hydrogen produced is stored through methanol, and formic acid with a purity > 95% is produced as a by-product, forming a "hydrogen-formic acid" dual-production value-added chain.

[0044] Furthermore, the current distribution unit included in the frequency-domain decomposition module decomposes the input fluctuating current by frequency band. The high-frequency components are directed to the PEM electrolyzer module for water electrolysis hydrogen production, the low-frequency components are directed to the methanol electrolyzer module to replace traditional alkaline water electrolysis hydrogen production, enabling methanol electrolysis hydrogen production at low potential and low energy consumption. The intermediate-frequency components are directed to the AEM electrolyzer module for water electrolysis hydrogen production according to the load response state, capable of quickly switching the current path for short-term severe fluctuations. For example, when the input current shows high-frequency fluctuations due to sudden changes in wind speed, the current distribution system directs the high-frequency components to the PEM module, reducing the impact on a single electrolyzer module and effectively avoiding the impact of fluctuating current on the operating life of the electrolyzer.

[0045] Furthermore, a topology controller is configured in the electrolyzer module. The topology controller can take frequency-domain characteristics in real time to control the series / parallel connection mode of the electrolyzer cluster module, and can preferentially use high-efficiency modules or isolate aging modules according to the measured frequency volatility. A programmable connector is used to quickly switch the connection of the electrolyzer module, enabling the system to adapt to the input fluctuation characteristics. For example, in the high-frequency fluctuation stage (such as when sudden changes in wind speed cause current spectrum offset), the system switches the PEM module to a parallel topology to enhance the instantaneous current-carrying capacity, while isolating aging or efficiency-decaying electrolytic units; in the low-frequency steady-state stage, the methanol electrolysis module is switched to a series topology, and combined with its low oxidation potential characteristics, the efficiency decay caused by fluctuations is suppressed within 5%. Combined with the methanol hydrogen storage and regeneration module, the hydrogen produced is stored through methanol, and formic acid with a purity > 95% is produced as a by-product, forming a "hydrogen-formic acid" dual-production value-added chain. The service life is increased by 40% compared with the traditional alkaline electrolysis system, and the energy consumption is effectively reduced. This design breaks through the frequency response limitations of single electrolysis technology, realizes the efficient adaptive conversion of fluctuating energy, and can also improve the overall efficiency, service life, and anti-fluctuation stability of the hydrogen production system.

[0046] Furthermore, the methanol hydrogen storage and regeneration module includes an electrolyte circulation device, a circulation pump, an electrolytic cell, a gas-liquid separator, a flow meter, a hydrogen storage tank, a pressure balance tank, and a methanol hydrogen storage device; the circulation pump, the gas-liquid separator, the hydrogen storage tank, and the pressure balance tank are connected, the flow meter is connected to the pipeline of the gas-liquid separator, and the gas-liquid separator is connected to the electrolyte circulation device; the methanol hydrogen storage device is used to collect the generated hydrogen. Specifically, the gas-liquid separator is preferably a gas-liquid separation dryer. The connection between the gas-liquid separator and the electrolyte circulation device facilitates the recycling of the electrolyte, precisely adjusts the pressure difference between the hydrogen and oxygen sides through the pressure balance tank, and prevents gas mixing. Among them, the methanol hydrogen storage device is used to collect the generated hydrogen. At the same time, the methanol solution can also realize hydrogen production by electrolyzing methanol at a low potential as the anodic end of water electrolysis for hydrogen production, and the reaction rate is relatively stable, and the hydrogen production will not change violently due to large fluctuations in potential, with lower energy consumption. On the other hand, formic acid produced by electrolyzing methanol plays an important role and application value in aspects such as chemical synthesis, materials science, environmental science, and the energy field, and can realize the full utilization of resources.

[0047] Furthermore, the bidirectional inverter is electrically connected to the water-wind-solar complementary controller. Through the bidirectional inverter, direct current can be converted into alternating current and transmitted to the power grid, while the excess electric energy is transmitted to the energy storage device for storage. Specifically, when the grid load is low or the power generation exceeds the current demand, the excess electric energy is converted by the bidirectional inverter and stored in the energy storage device; when the power generation is insufficient or at the peak of the grid load, the electric energy in the energy storage device can be converted into alternating current by the bidirectional inverter and fed back to the power grid; thus, the efficient utilization and stable supply of electric energy are realized. Especially in areas with rich water resources, it can provide a more reliable and continuous power output, optimizing the performance and efficiency of the entire power generation system;

[0048] Furthermore, the system also includes an energy management module, which is electrically connected to the methanol hydrogen storage device, thereby realizing the optimization of the energy distribution strategy, reducing the rate of abandoned wind and light, and achieving the optimization of energy utilization.

[0049] Furthermore, the system also includes a power grid, and the power grid converts alternating current into direct current through a rectifier for electrolytic hydrogen production.

[0050] It should be noted that the applicant conducted the following comparative experiments to verify the actual effects and advantages of the present invention:

[0051] Comparative Example 1: A traditional photovoltaic electrolytic water hydrogen production device was used. Through experiments, it was found that when the photovoltaic power mutated, the ALK electrolytic cell frequently triggered overvoltage protection due to response delay, resulting in system shutdown, and the current density fluctuation caused aggravated electrode polarization.

[0052] Comparative Example 2: Hydrogen production is carried out using an electrolyzer stack or series-connected and parallel-connected ALK and PEM electrolyzers. The experimental results show that although this device can respond quickly in a short time, it will cause an impact on the electrolyzer under long-term fluctuations of different frequencies. Moreover, in a traditional high-potential water electrolysis system, a slight change in potential may have a greater impact on the electrolysis efficiency and hydrogen production rate, and may lead to problems such as corrosion of the internal materials of the electrolyzer and degradation of the membrane.

[0053] Comparative Example 3: The electrochemically deposited and sulfurized electrolytic methanol hydrogen production anode catalyst CC@NiCo2S4 is used. Compared with CC@NiCoS / Fe (one-step electrodeposition method), it is more complex and the cost of Co is high. By adjusting the scanning rate and potential range, porous nanosheets are directly formed without a template or additional etching.

[0054] Through the above comparative examples, the significant advantages of the hydrogen production system provided in this embodiment in efficiently utilizing the fluctuating power of water, wind, and solar power, regulating different electrolyzer modules, and using different electrolytic hydrogen production technologies are further demonstrated.

[0055] It should be noted that the hydrogen production system provided in this embodiment realizes organic integration through the multi-energy collaborative integration of oil and gas field resources, wind energy, solar energy, and water energy, in combination with the dual-path hydrogen production technology of electrolyzed water and methanol electrocatalysis. A new type of methanol electrolysis system is used to replace the traditional alkaline electrolysis system. In the methanol electrolysis hydrogen production system, a one-step electrodeposition method is used to design an anode catalyst to in-situ grow porous NiCoS / Fe nanosheets (CC@NiCoS / Fe) on a three-dimensional carbon cloth substrate. In alkaline MOR, the d-band centers of Ni and Co can be adjusted by doping with trace amounts of Fe, optimizing the adsorption energy of methanol molecules, reducing the MOR energy barrier. Combining the high specific surface area and hierarchical pore size distribution of the porous nanosheets can fully expose the Ni / Co / Fe active sites, accelerating the mass transfer of methanol and OH-, and increasing the electrochemically active area by more than 3 times. The catalyst used in this embodiment can achieve efficient hydrogen production at low potentials, showing excellent performance in the alkaline electrolysis system, and achieving a methanol oxidation Faraday efficiency of 98.5% at 1.35 V vs. RHE, with the hydrogen production rate increased by 2.3 times compared to traditional catalysts, providing an efficient anode material solution for a low-energy consumption and high-stability methanol hydrogen production system. The wavelet packet decomposition algorithm is used to accurately decompose the fluctuating input current in real-time frequency bands (high frequency > 10 Hz, medium frequency 1 - 10 Hz, low frequency < 1 Hz). A quick-insert flow channel interface is used, and different frequency band currents are directed to the appropriate electrolyzer modules through electronic power switches. Specifically, the high-frequency components are directed to the PEM electrolysis module, the medium-frequency components are dynamically distributed to the AEM module, and the low-frequency components are introduced into the methanol electrolysis module. When the low-frequency components are directed, the inherent low oxidation potential characteristics of the methanol electrocatalytic reaction are utilized to reduce the potential fluctuation impact caused by power supply fluctuations or load changes by more than 80%. Under high-frequency fluctuations, the PEM module is quickly switched to a parallel topology, and a multi-mode collaborative control dominated by electrolyzed water is switched for high-frequency and medium-frequency components (high frequency → PEM electrolyzer module, medium frequency → AEM electrolyzer module), thereby effectively suppressing the impact of current fluctuations on the system, enabling the system to maintain a hydrogen production efficiency of 65% - 68% under intermittent renewable energy input, alleviating the problems of efficiency attenuation and high energy consumption caused by the high potential sensitivity of traditional alkaline electrolyzers. Through a programmable connector and a topology controller, the series / parallel connection mode of the electrolyzer cluster is switched in real-time; under low-frequency fluctuations, the methanol electrolysis module is used to increase the efficiency to more than 70%, ensuring that the system can flexibly adapt to the input characteristics, reducing the impact of frequency fluctuations on a single electrolyzer module, and improving the overall stability and reliability of the system.It can also utilize the low oxidation potential characteristics of methanol electrocatalysis to make the hydrogen production rate fluctuation caused by power supply fluctuation (±0.3V) less than 5%. At the same time, through a programmable connector and a topology controller, the series / parallel topology of the electrolyzer cluster is dynamically switched, that is, the PEM is in parallel response during high-frequency fluctuations, and the methanol module is in series connection during low-frequency steady state to improve the efficiency to 70%. Combining the advantages of high-purity formic acid by-product in electrocatalytic methanol hydrogen production, a "hydrogen-formic acid" dual-product synergistic value-added mode is formed, effectively solving the problems of efficiency attenuation, high energy consumption and insufficient economy of traditional electrolyzers under the fluctuating input of renewable energy. Through modular design, the present invention supports rapid deployment and expansion and designs an anode catalyst for electrolytic methanol hydrogen production, forming a green hydrogen production solution with both stability and adaptability, which is of great significance for promoting the transformation of the energy structure, improving the stability of the energy system and promoting the development of green energy.

[0056] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0057] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An oil and gas field water, wind, and solar multi-energy fluctuating source network electrolytic methanol hydrogen production system, the system includes a processor, and is characterized in that, It further includes: A water-wind-solar power generation module, a frequency-domain decomposition module, an electrolyzer module, a methanol hydrogen storage and regeneration module, an energy storage device, and a bidirectional inverter that are data-connected to the processor; where: The water-wind-solar power generation module automatically adjusts the operation mode of the power generation equipment based on the acquired meteorological data and hydrological data, and realizes power distribution through complementary power generation in terms of anti-fluctuation. The frequency-domain decomposition module divides the fluctuating input current into high-frequency, medium-frequency, and low-frequency components according to frequency based on the wavelet packet decomposition algorithm, and matches the currents in different frequency bands. The electrolyzer module performs circuit configuration based on a programmable connector. The methanol hydrogen storage and regeneration module is used to collect hydrogen, recycle the electrolyte, and reuse the solution. The energy storage device is used to be electrically connected to the methanol hydrogen storage and regeneration module. The bidirectional inverter is used to convert direct current into alternating current and transmit it to the power grid, and transmit the excess electric energy to the energy storage device for storage.

2. The system according to claim 1, characterized in that: The water-wind-solar power generation module includes a water-wind-solar complementary controller and a wind power generation group, a photovoltaic power generation group, and a hydraulic power generation group that are electrically connected to the water-wind-solar complementary controller; the wind power generation group and the photovoltaic power generation group are used to capture wind energy and solar energy and output fluctuating direct current; the hydraulic power generation group drives the water turbine to rotate based on the potential energy and kinetic energy of the water flow, and then drives the generator to generate electricity; the water-wind-solar complementary controller is used to monitor the operation states of the wind power generation group, the photovoltaic power generation group, and the hydraulic power generation group.

3. The system according to claim 1, wherein: The frequency-domain decomposition module includes a rectifier and a current distribution unit.

4. The system according to claim 1, wherein: The electrolyzer module includes a methanol electrolyzer module, a PEM electrolyzer module, an AEM electrolyzer module, and an independent electronic power switch; the methanol electrolyzer module includes a cathode catalytic module, an anode catalytic module, a plate module, and an end plate.

5. The system according to claim 1, wherein: The methanol hydrogen storage and regeneration module includes an electrolyte circulation device, a circulation pump, an electrolyzer, a gas-liquid separator, a flow meter, a hydrogen storage tank, a pressure balance tank, and a methanol hydrogen storage device; the circulation pump, the gas-liquid separator, the hydrogen storage tank, and the pressure balance tank are connected, the flow meter is connected to the pipeline of the gas-liquid separator, and the gas-liquid separator is connected to the electrolyte circulation device; the methanol hydrogen storage device is used to collect the generated hydrogen.

6. The system according to claim 2, wherein: The bidirectional inverter is electrically connected to the water-wind-solar complementary controller.

7. The system according to claim 5, wherein: The system further includes an energy management module, and the energy management module is electrically connected to the methanol hydrogen storage device.

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