Electrolytic hydrogen production system without cooling water and control method thereof

Abstract

The invention discloses a cooling-water-free electrolytic hydrogen production system and a control method thereof, and relates to the technical field of hydrogen energy. The electrolytic hydrogen production system without cooling water comprises an electrolytic bath, and a post-processing module and power supply equipment which are connected with the electrolytic bath, the electrolytic bath is used for producing hydrogen and oxygen through electrochemical reaction and outputting hydrogen and oxygen; the post-treatment module comprises a gas-liquid separation unit, a gas washing unit and a gas filtering unit which are connected in sequence, and the post-treatment module is used for treating the hydrogen and the oxygen output by the electrolytic cell and outputting the hydrogen and the oxygen meeting the specification; the power equipment is used for providing electric energy for the electrolytic cell; wherein the heat consumed by the electrolytic bath and the post-treatment module under the condition of no cooling water is the same as the total heat production. Therefore, electrolytic hydrogen production without cooling water is realized, the energy consumption is effectively reduced, the waste of water resources is reduced, and the applicability and the economic benefit of an electrolytic hydrogen production system are improved.

Description

Technical Field

[0001] The present application relates to the field of hydrogen energy technology, and in particular to a cooling water-free electrolysis hydrogen production system and a control method thereof. Background Art

[0002] As the global demand for clean energy continues to grow, hydrogen energy, as a clean and efficient energy carrier, has received more and more attention. As a mature technology, hydrogen production by alkaline water electrolysis has been used in my country for decades and has been widely used in many industries. However, with the construction and commissioning of large-scale demonstration projects, the main challenges facing this technology have gradually emerged.

[0003] First, the energy consumption of the water electrolysis hydrogen production system is high, resulting in high hydrogen production costs, mainly due to the high electricity consumption. Secondly, the performance of the electrolyzer is severely degraded. In order to obtain higher gas production, the electrolyzer is usually designed and operated with a large current, which makes the electrochemical reaction on the electrode surface extremely violent, which can easily cause the electrode coating material to fall off and fail, resulting in a rapid decline in the performance of the electrolyzer. Finally, the hydrogen production system process requires a large amount of cooling water, far exceeding the water quota stipulated by regional regulations. In the current hydrogen production process, a large amount of heat generated during the water electrolysis process needs to be exchanged with cooling water to maintain the stable operation of the system. This not only increases the pressure on water resources, but also brings huge cooling equipment investment and floor space requirements. Summary of the invention

[0004] The main purpose of the present application is to provide a cooling water-free electrolytic hydrogen production system and a control method thereof, so as to realize cooling water-free electrolytic hydrogen production, effectively reduce energy consumption, reduce water resource waste, and improve the applicability and economic benefits of the electrolytic hydrogen production system.

[0005] To achieve the above-mentioned object, the present application provides a cooling water-free electrolytic hydrogen production system, comprising an electrolytic cell and a post-processing module and a power supply device connected to the electrolytic cell;

[0006] The electrolyzer is used to produce hydrogen and oxygen through electrochemical reactions, and output hydrogen and oxygen;

[0007] The post-processing module comprises a gas-liquid separation unit, a gas washing unit and a gas filtering unit which are connected in sequence, and the post-processing module is used to process the hydrogen and oxygen output by the electrolyzer and output hydrogen and oxygen that meet the regulations;

[0008] The power supply device is used to provide electrical energy to the electrolytic cell;

[0009] Wherein, the heat consumed by the electrolytic cell and the post-processing module in the absence of cooling water is the same as the total heat generated.

[0010] Optionally, the electrolyzer and the post-processing module are connected via a first channel and a second channel; the gas-liquid separation unit comprises a first separator and a second separator, the first separator is connected to the first channel, and the second separator is connected to the second channel; the first separator is used to perform gas-liquid separation on the hydrogen output by the electrolyzer, and the second separator is used to perform gas-liquid separation on the oxygen output by the electrolyzer.

[0011] Optionally, the gas washing unit includes a first scrubber and a second scrubber; the first scrubber is connected to the first separator, and the second scrubber is connected to the second separator; the first scrubber is used to wash the hydrogen output by the first separator, and the second scrubber is used to wash the oxygen output by the second separator.

[0012] Optionally, the gas filtration unit includes a first filter and a second filter; the first filter is connected to the first scrubber, and the second filter is connected to the second scrubber; the first filter is used to filter and separate gas and water from the hydrogen output by the first scrubber, and the second filter is used to filter and separate gas and water from the oxygen output by the second scrubber.

[0013] Optionally, the system also includes a controller; the controller is used to obtain multiple thermal parameters of the electrolytic cell and the post-processing module in the absence of cooling water, and determine the calorific value of the electrolytic cell based on each of the thermal parameters, and determine the operating current and operating voltage of the electrolytic cell based on the calorific value of the electrolytic cell, and the operating current and the operating voltage are used to determine the electric energy output by the power supply device; the controller is an independent device or integrated in the power supply device.

[0014] Optionally, the amount of water consumed by the electrolytic hydrogen production system for producing unit hydrogen production is x, the universal rated water consumption for the electrolytic hydrogen production system for producing unit hydrogen production is N, and x is less than N.

[0015] In addition, to achieve the above-mentioned purpose, the present application also provides a control method for an electrolytic hydrogen production system without cooling water, which is applied to the electrolytic hydrogen production system without cooling water as described above, and the method includes: obtaining multiple thermal parameters of the electrolytic cell and the post-processing module in the absence of cooling water; determining the heating value of the electrolytic cell according to each of the thermal parameters; determining the operating current and operating voltage of the electrolytic cell according to the heating value of the electrolytic cell, and controlling the electric energy output by the power supply device based on the operating current and the operating voltage.

[0016] Optionally, the thermal parameters include a first thermal parameter, a second thermal parameter, a third thermal parameter, a fourth thermal parameter and a fifth thermal parameter; wherein the first thermal parameter is the heat required for the cooling water-free electrolysis hydrogen production system to be heated from ambient temperature to a corresponding operating temperature; the second thermal parameter is the heat required for the raw water in the electrolyzer to be heated from ambient temperature to a corresponding operating temperature; the third thermal parameter is the heat taken away when the hydrogen and oxygen prepared in the electrolyzer are discharged; the fourth thermal parameter is the heat consumed when water evaporates in the post-processing module; and the fifth thermal parameter is the heat released by the electrolyzer and the post-processing module to the surrounding environment by thermal radiation convection at the corresponding operating temperature.

[0017] Optionally, determining the calorific value of the electrolytic cell according to each of the heat parameters includes: summing the first heat parameter, the second heat parameter, the third heat parameter, the fourth heat parameter and the fifth heat parameter to obtain the calorific value of the electrolytic cell.

[0018] Optionally, the method also includes: determining the temperature difference and heat exchange conditions of the hydrogen production system by electrolysis according to the ambient temperature of the area where the hydrogen production system is located and the operating temperature of the electrolyzer, wherein the heat exchange conditions include at least the surface characteristics of the electrolyzer and the orientation and number of doors and windows of the hydrogen production station where the hydrogen production system by electrolysis is located; and determining the fifth thermal parameter based on the temperature difference and the heat exchange conditions.

[0019] The electrolytic hydrogen production system without cooling water of the present application makes the heat consumed by the electrolyzer and the post-processing module in the absence of cooling water the same as the total heat production, and there is no need to use cooling water for heat exchange, thereby realizing electrolytic hydrogen production without cooling water and reducing the waste of water resources; and the electrolytic hydrogen production system without cooling water of the present application changes the water vapor separator originally located at the end of the post-processing module into a gas filtration unit, and the gas filtration unit can reduce the water content in the gas by physical filtration, so it does not need to consume energy, thereby effectively reducing energy consumption, further improving the applicability and economic benefits of the electrolytic hydrogen production system without cooling water. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a prior art electrolysis hydrogen production system without cooling water as an example of the present application;

[0021] Figure 2 This is one of the structural schematic diagrams of the electrolysis hydrogen production system without cooling water according to an embodiment of the present application;

[0022] Figure 3 is a structural schematic diagram of an example hydrogen production station of the present application;

[0023] Figure 4This is the second structural schematic diagram of the electrolysis hydrogen production system without cooling water according to an embodiment of the present application;

[0024] Figure 5 is a flow chart of a control method of a cooling water-free electrolysis hydrogen production system according to an embodiment of the present application;

[0025] Figure 6 is a curve showing the relationship between the voltage and the electrolysis current of an electrolytic cell of an example of the present application;

[0026] Figure 7 This is a curve showing the relationship between the voltage of the electrolytic cell and the calorific value of the electrolytic cell in an example of the present application;

[0027] Figure 8 is a curve showing the relationship between the electrolytic cell voltage and the electrolytic energy efficiency of an example of the present application;

[0028] Fig. 9 An example of a physical structure diagram of a controller is shown;

[0029] In the figure, 100, electrolytic cell; 200, post-processing module; 210, gas-liquid separation unit; 211, first separator; 212, second separator; 220, gas washing unit; 221, first scrubber; 222, second scrubber; 230, gas filtration unit; 231, first filter; 232, first scrubber; 300, power supply device; 910, processor; 920, communication interface; 930, memory; 940, communication bus.

[0030] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] Alkaline water electrolysis hydrogen production technology has a history of decades of development in my country and has been widely used in many industries. With the promulgation and implementation of my country's Energy Law, hydrogen energy has been officially included in the energy category. In recent years, the production of hydrogen (i.e. green hydrogen) through the coupling of wind and solar renewable energy green electricity with water electrolysis has developed rapidly.

[0033] Figure 1 This is an example of a prior art electrolysis hydrogen production system without cooling water. Figure 1As shown, the existing electrolytic hydrogen production system without cooling water usually includes a hydrogen heat exchanger, an oxygen heat exchanger, an alkali liquid heat exchanger and a water vapor separator. Correspondingly, cooling tower equipment is also required in the public auxiliary facilities to achieve heat exchange through cooling water.

[0034] However, with the construction and commissioning of multiple demonstration projects, the main difficulties faced by the large-scale water electrolysis hydrogen production process technology route have gradually emerged, seriously restricting the healthy development of the hydrogen energy industry. The main problems are specifically reflected in the following three aspects:

[0035] 1. The high energy consumption of the hydrogen production system leads to high hydrogen production costs. According to statistics, during the hydrogen production process, the electricity consumption of the hydrogen production system accounts for about 80% of the direct cost of hydrogen production. Therefore, the cost of hydrogen production is very sensitive to the energy efficiency level of the system. Improving the energy efficiency of the hydrogen production system and reducing energy consumption are the key to solving this problem.

[0036] 2. The performance of the electrolyzer decays quickly. The existing electrolyzer design and operation mode usually adopts a high current mode to obtain a larger gas production. However, a higher operating current density will make the electrochemical reaction on the electrode surface extremely intense, which can easily cause the electrode coating material to fall off and fail, resulting in rapid decay of the electrolyzer performance. This not only shortens the service life of the equipment, but also increases the maintenance and replacement costs.

[0037] 3. The hydrogen production system has a huge demand for cooling water. During the process of water electrolysis hydrogen production, the electrolyzer will generate a large amount of heat energy. In order to maintain the safe and stable operation of the system, a large amount of cooling water must be configured for heat exchange. Under existing technical conditions, the demand for cooling water in the water electrolysis hydrogen production process far exceeds the regional regulatory water quota, which is about three times the regulatory requirements. The investment in cooling water equipment, construction land occupation, and pipeline corridor laying costs are also quite high, further limiting the expansion of water electrolysis hydrogen production projects.

[0038] Water electrolysis green hydrogen technology requires abundant electricity and water resources. In the future, large-scale green hydrogen production will seriously affect the commissioning of water electrolysis hydrogen production projects, thereby affecting the healthy development of the hydrogen energy industry. To this end, it is necessary to start from the overall process of hydrogen production plants or hydrogen production stations, and reduce the system's demand for water resources and energy consumption by improving the process technology and operation strategies of hydrogen production systems, so as to promote the sustainable development of the hydrogen energy industry.

[0039] Based on this, the embodiment of the present application provides a cooling water-free electrolytic hydrogen production system and a control method thereof. By improving the cooling water-free electrolytic hydrogen production system and its operation strategy, the cooling water-free electrolytic hydrogen production system can be operated at a higher energy efficiency level, reducing energy consumption and thus reducing the cost of hydrogen production. Secondly, the life of the equipment in the system is extended by adjusting the operation strategy; finally, by adjusting the operation strategy, the heat generation of the electrolyzer is balanced with the heat dissipation of the cooling water-free electrolytic hydrogen production system, thereby abandoning all supporting facilities and equipment related to cooling water in the existing cooling water-free electrolytic hydrogen production system, abandoning some process requirements such as cooling towers, cooling pools and pipelines in public and auxiliary facilities, realizing cooling water-free operation, reducing water resource waste, and improving the applicability and economic benefits of the cooling water-free electrolytic hydrogen production system.

[0040] For ease of understanding, the structure of the cooling water-free electrolysis hydrogen production system of an embodiment of the present application is first introduced in detail below.

[0041] Figure 2 FIG. 1 is one of the structural schematic diagrams of the electrolytic hydrogen production system without cooling water according to the embodiment of the present application. Figure 2 As shown, the cooling water-free electrolytic hydrogen production system may include an electrolyzer 100 , and a post-processing module 200 and a power supply device 300 connected to the electrolyzer 100 .

[0042] The electrolyzer 100 is used to produce hydrogen and oxygen through electrochemical reactions and output hydrogen and oxygen; the post-processing module 200 includes a gas-liquid separation unit 210, a gas washing unit 220 and a gas filtering unit 230 connected in sequence, and the post-processing module 200 is used to process the hydrogen and oxygen output by the electrolyzer 100 and output hydrogen and oxygen that meet the regulations; the power supply device 300 is used to provide electric energy for the electrolyzer 100. The heat consumed by the electrolyzer 100 and the post-processing module 200 without cooling water is the same as the total heat generated.

[0043] In this embodiment, the power supply device 300 provides the electrolyzer 100 with electric energy for the electrolytic hydrogen production process so that the electrolyzer 100 can perform an electrochemical reaction. Specifically, the power supply device 300 is responsible for processing the electric power, outputting direct current suitable for the operation of the electrolyzer 100, and accurately controlling it. In addition, the power supply device 300 also has monitoring and protection functions to prevent abnormal conditions such as overload or short circuit.

[0044] The electrolyzer 100 is the core equipment for producing hydrogen by water electrolysis. It is an electrochemical reactor that decomposes water into hydrogen and oxygen through electrochemical reactions. It is usually composed of multiple units, each of which contains one or more pairs of electrodes, and an electrolyte (usually an alkaline solution) is filled between the electrodes. Under the action of electric current, water molecules decompose on the surface of the electrodes to produce hydrogen and oxygen.

[0045] The post-processing module 200 is used to process the hydrogen, oxygen and electrolyte produced by the electrolytic cell 100 to ensure that the final output gas meets industrial standards and can control the recycling of the electrolyte.

[0046] In this embodiment, the post-processing module 200 may include a gas-liquid separation unit 210, a gas washing unit 220, and a gas filtering unit 230. The gas-liquid separation unit 210 is used to separate the gas output from the electrolyzer 100 into gas and liquid. Its working principle is based on the gas-liquid separation technology, the gas is discharged, and the liquid sinks back to the electrolyzer 100. This separation process ensures the purity of hydrogen and oxygen and reduces the complexity of subsequent processing steps.

[0047] The gas washing unit 220 is used to wash the gas after gas-liquid separation with pure water to remove alkali vapor and other impurities contained therein. This step is crucial to improve the purity of hydrogen and oxygen and ensure that the final product meets the requirements of industrial applications.

[0048] The gas filter unit 230 is used to further filter the washed hydrogen or oxygen, thereby removing moisture and other impurities therein to the maximum extent. The filtered gas has a higher cleanliness and is suitable for a wider range of industrial application scenarios.

[0049] Figure 3 Schematic diagram of a hydrogen production station according to an example of the present application. Figure 3 As shown, as an example, the electrolytic hydrogen production system without cooling water can work together with public auxiliary facilities to achieve hydrogen and oxygen production. In this example, the public auxiliary facilities can include high-voltage power side equipment, raw water treatment equipment, nitrogen production equipment and compressed air equipment.

[0050] Among them, the raw water treatment equipment is responsible for purifying the water entering the electrolytic cell 100 to ensure that it meets the requirements of the electrolysis process. By removing impurities and ions in the water, the electrolysis efficiency can be significantly improved and the service life of the equipment can be extended. The nitrogen production equipment is used to provide replacement nitrogen for operations such as startup, shutdown and troubleshooting of the electrolytic hydrogen production system without cooling water. The inert properties of nitrogen make it an ideal replacement gas that can effectively prevent explosions and other safety accidents. The compressed air equipment provides qualified instrument gas for the electrolytic hydrogen production system without cooling water, which is used to drive various valves, sensors and other automatic control equipment. A stable supply of compressed air is essential for the normal operation of the system.

[0051] In this embodiment, the heat consumed by the electrolyzer 100 and the post-processing module 200 in the absence of cooling water is the same as the total heat production. It is understandable that in the existing electrolytic hydrogen production system without cooling water, some heat exchangers are set to perform cooling water heat exchange. During the heat exchange process, the heat taken away by the cooling water will also be considered as the heat consumed by the system. However, in the electrolytic hydrogen production system without cooling water of the embodiment of the present application, no cooling water-related equipment is set, so the heat consumed by the electrolyzer 100 and the post-processing module 200 does not include the heat consumed by cooling water.

[0052] This embodiment can control the operating current and operating voltage of the electrolyzer 100 by controlling the amount of energy supplied by the power supply device 300, and thus can control the heat generated by the electrolyzer, which is a controllable part of the total heat generated by the system, so that the total heat generated by the system can be the same as the heat consumed by the system without cooling water. In this way, not only can hydrogen production by electrolysis without cooling water be achieved, but also a certain amount of electricity cost can be saved and the energy efficiency of electrolysis can be improved.

[0053] Figure 4 This is the second structural schematic diagram of the electrolytic hydrogen production system without cooling water in the embodiment of the present application. Figure 2 As shown, in some embodiments, the electrolyzer 100 and the post-processing module 200 are connected via a first channel and a second channel; the gas-liquid separation unit 210 includes a first separator 211 and a second separator 212, the first separator 211 is connected to the first channel, and the second separator 212 is connected to the second channel; the first separator 211 is used to perform gas-liquid separation on the hydrogen output by the electrolyzer 100, and the second separator 212 is used to perform gas-liquid separation on the oxygen output by the electrolyzer 100.

[0054] It should be noted that the first channel in this embodiment can be used to transmit the hydrogen output by the electrolyzer 100 to the post-processing module 200 , and the second channel in this embodiment can be used to transmit the oxygen output by the electrolyzer 100 to the post-processing module 200 .

[0055] The gas-liquid separation unit 210 may specifically include a first separator 211 and a second separator 212. The first separator 211 may specifically be a hydrogen separator, which is connected to the first channel, and is used to receive the hydrogen output by the electrolyzer 100, and discharge the hydrogen through the gas-liquid separation technology, and the liquid sinks back to the electrolyzer 100. The second separator 212 may specifically be an oxygen separator, which is connected to the second channel, and is used to receive the oxygen output by the electrolyzer 100, and discharge the oxygen through the gas-liquid separation technology, and the liquid sinks back to the electrolyzer 100.

[0056] Continue to refer Figure 4In some embodiments, the gas washing unit 220 may include a first scrubber 221 and a second scrubber 222; the first scrubber 221 is connected to the first separator 211, and the second scrubber 222 is connected to the second separator 212; the first scrubber 221 is used to wash the hydrogen output from the first separator 211, and the second scrubber 222 is used to wash the oxygen output from the second separator 212.

[0057] In this embodiment, the first scrubber 221 can specifically be a hydrogen scrubber. The first scrubber 221 is connected to the first separator 211. The first scrubber 221 is used to receive the hydrogen after gas-liquid separation by the first separator 211, and to wash the hydrogen discharged from the first separator 211 with pure water to remove the alkali vapor and other impurities contained therein.

[0058] The second scrubber 222 can specifically be an oxygen scrubber. The second scrubber 222 is connected to the second separator 212. The second scrubber 222 is used to receive the oxygen after gas-liquid separation by the second separator 212, and wash the oxygen discharged from the second separator 212 with pure water to remove the alkali vapor and other impurities contained therein.

[0059] Continue to refer Figure 4 In some embodiments, the gas filtration unit 230 may include a first filter 231 and a second filter 232; the first filter 231 is connected to the first scrubber 221, and the second filter 232 is connected to the second scrubber 222; the first filter 231 is used to filter and separate the hydrogen output by the first scrubber 221 from gas and water, and the second filter 232 is used to filter and separate the oxygen output by the second scrubber 222 from gas and water.

[0060] In this embodiment, both the first filter 231 and the second filter 232 can be gas filters. The first filter 231 is connected to the first scrubber 221, and the first filter 231 is used to further filter the washed hydrogen to remove moisture and other impurities therein to the maximum extent. The filtered gas has a higher cleanliness and is suitable for a wider range of industrial application scenarios.

[0061] Similarly, the second filter 232 is connected to the second scrubber 222, and the second filter 232 is used to further filter the scrubbed oxygen to remove moisture and other impurities therein to the maximum extent possible.

[0062] It is worth mentioning that, because the cooling water-free electrolytic hydrogen production system of this embodiment removes the oxygen heat exchanger and the hydrogen heat exchanger, the temperature of the produced hydrogen and oxygen when output will be higher than the gas temperature produced by the ordinary system, but will not be higher than the system operating temperature. However, when the gas temperature is high, the water content is relatively high, which is not conducive to further purification of the gas in the later stage. Therefore, the gas-water separator at the end of the post-processing module 200 in the prior art is adjusted to a gas filter. The main function of the gas filter is to reduce the water content in the output gas through non-energy-consuming filtering methods such as physical filtration, and the higher output gas temperature is conducive to reducing the consumption of the subsequent gas purification system.

[0063] In some embodiments, the cooling water-free electrolysis hydrogen production system may further include a controller (not shown in the figure); the controller is used to obtain multiple thermal parameters of the electrolyzer 100 and the post-processing module 200 in the absence of cooling water, and determine the calorific value of the electrolyzer according to each thermal parameter, and determine the operating current and operating voltage of the electrolyzer 100 according to the calorific value of the electrolyzer, and the operating current and operating voltage are used to determine the electric energy output by the power supply device 300; the controller is an independent device or integrated in the power supply device 300.

[0064] It should be noted that the controller of this embodiment can be an independent controller device, or a controller or control function module integrated in the power supply device 300, and the location of the controller is not specifically limited here. In addition, the heat generated by the electrolytic cell mainly refers to the heat generated when the electrolytic cell is powered by the power supply device for electrolysis.

[0065] Specifically, the controller of this embodiment can be used to control the electric energy output by the power supply device 300, thereby controlling the operating current and operating voltage output to the electrolyzer 100, and then controlling the heat generation of the electrolyzer, so as to achieve the same total heat production and heat consumption, thereby realizing hydrogen production without cooling water.

[0066] In this embodiment, the controller can first obtain multiple thermal parameters of the electrolyzer 100 and the post-processing module 200 without cooling water. The thermal parameters include a first thermal parameter, a second thermal parameter, a third thermal parameter, a fourth thermal parameter, and a fifth thermal parameter; wherein the first thermal parameter is the heat required for the electrolytic hydrogen production system without cooling water to be heated from ambient temperature to the corresponding working temperature; the second thermal parameter is the heat required for the raw water in the electrolyzer 100 to be heated from ambient temperature to the corresponding working temperature; the third thermal parameter is the heat taken away when the hydrogen and oxygen prepared in the electrolyzer 100 are discharged; the fourth thermal parameter is the heat consumed when water evaporates in the post-processing module 200; the fifth thermal parameter is the heat released by the electrolyzer 100 and the post-processing module 200 to the surrounding environment by thermal radiation convection at the corresponding working temperature.

[0067] Furthermore, the controller can sum the first heat parameter, the second heat parameter, the third heat parameter, the fourth heat parameter and the fifth heat parameter to obtain the calorific value of the electrolyzer. It should be noted that in the summation process, the heat parameters need to be summed with signs. For example, the first heat parameter is the heat required for the electrolytic hydrogen production system without cooling water to be heated from ambient temperature to the corresponding working temperature, that is, the required heat production, then the first heat parameter can be positive; the third heat parameter is the heat taken away when the hydrogen and oxygen prepared in the electrolyzer 100 are discharged, that is, the heat dissipation during the electrolysis process, then the third heat parameter is negative. The calorific value of the electrolyzer calculated at the end only needs to be taken as a numerical value, without a sign.

[0068] Finally, the controller determines the operating voltage and operating current of the electrolytic cell 100 at which the total heat production is equal to the total heat consumption based on the determined heat generation of the electrolytic cell and the corresponding relationship between heat, voltage, and current, and then controls the power supply device 300 to supply energy based on the operating voltage and operating current of the electrolytic cell 100.

[0069] In some embodiments, the amount of water consumed by the electrolytic hydrogen production system for producing unit hydrogen production is x, the universal rated water consumption for the electrolytic hydrogen production system for producing unit hydrogen production is N, and x is less than N.

[0070] It is understandable that the operation of the water electrolysis hydrogen production system in the prior art requires water in two aspects: one is the electrolysis raw water, which is pure water and is used for the electrochemical reaction of water electrolysis to produce hydrogen and oxygen. It is an essential raw material for the production of hydrogen; the other is cooling circulating water, which removes excess heat from the system through circulating flow heat exchange and controls the system operating temperature.

[0071] In actual application, due to the vast territory of my country and the different resource endowments of various regions, different regions have their own regulations and standards on "Industry Water Use Quotas". Such standards are used for regional water resources planning, water withdrawal permit approval, water use plan management, water conservation management, water resources demonstration of construction projects, water conservation evaluation and total water use control.

[0072] Taking the relevant standards of a northern province as an example, it stipulates that the water consumption quota for the advanced indicator of hydrogen production by water electrolysis technology is 10m 3 / t, the general water consumption quota is 12m 3 / t. According to the electrolytic reaction mechanism, theoretically, 1Nm 3 The production of hydrogen requires 804 ml of pure water, that is, the production of 1 ton of hydrogen requires about 9 ml of pure water. 3 Taking the existing general indicators of water electrolysis hydrogen production technology industry as an example, the existing 1000Nm 3 / h The cooling water demand of hydrogen production equipment is about 150m 3 / h~200m3 / h, the cooling water circulation cooling and heat exchange function is realized by cooling tower equipment. The evaporation loss of working water in the cooling tower is about 1% to 2.5% of its water intake, which is calculated based on the best indicators of existing technology. The evaporation loss of cooling tower water for producing 1 ton of hydrogen is about 16.8m 3 , that is, the actual water consumption demand of the existing hydrogen production system is 25.8m 3 / t, far exceeding the standard indicators.

[0073] The embodiment of the present application adopts a cooling water-free method, that is, the electrolysis hydrogen production system only needs to electrolyze raw water when in operation, and no cooling water is required. On the one hand, it can ensure that the production water index of the electrolysis hydrogen production system meets the quota advanced index usage standard regulations. On the other hand, the unit product water intake of the project construction is only within 1% of the existing technology (about 1 cubic meter of raw water, 0 cooling circulating water), which greatly reduces the demand for supporting water resources for project construction and liberates production resource elements.

[0074] As an example, assuming that the water consumption quota for the advanced indicator of hydrogen production by water electrolysis technology is 10m 3 / t, the general water consumption quota value (i.e. the general rated water consumption per unit hydrogen production of the above-mentioned electrolytic hydrogen production system) is 12m 3 / t. If the specification of hydrogen production equipment is 1000Nm 3 / h, it takes 11.2h for one hydrogen production equipment to produce 1 ton of hydrogen, the comparison is as follows:

[0075] 1000Nm in existing technology 3 / h The rated operation of hydrogen production equipment consumes 804ml of raw pure water per hour in theory. The equipment needs about 150m3 of cooling circulating water per hour. 3 That is, the water consumption of producing 1 ton of hydrogen by the existing technology is (804×1 / 1000+150)×11.2=1781m 3 ; The ratio of its actual water consumption to the standard general quota requirement is 1781÷12=148, that is, the actual water consumption exceeds the quota requirement by 148 times. If a cooling tower is used, the cooling water is circulated during use, and most of the water is not actually consumed during the circulation process. The actual cooling water loss due to evaporation, splashing, etc. is about 1% to 2.5%. Based on the optimal performance of the cooling tower, when the circulating water loss of the cooling tower equipment is 1%, 1000Nm 3 The actual cooling water consumption of the hydrogen production equipment is: per hour × 0.01 = 1.5m 3 , that is, the amount of water consumed in the hydrogen production process to produce 1 ton of hydrogen is (804×1 / 1000+1.5)×11.2=25.8m 3 ; The ratio to the standard general quota requirement is 25.8÷12=2.15, that is, the actual water consumption exceeds the quota requirement by 2.15 times.

[0076] The electrolytic hydrogen production system of the embodiment of the present application is a non-cooling process, that is, the hydrogen production equipment only consumes raw material pure water during production. The amount of pure water consumed to produce 1 ton of hydrogen is 804×1÷1000×11.2=9m 3 The ratio of the actual water consumption of hydrogen production in this embodiment to the general quota requirement is 9÷12=0.75, that is, the actual water consumption of the electrolytic hydrogen production system in this embodiment is 0.75 times the general quota requirement, which is less than the general quota water requirement and the advanced quota water requirement, and can fully meet the requirements of existing regulations.

[0077] With reference to the structure of the electrolytic hydrogen production system without cooling water in the above embodiment, the control method (ie, operation strategy) of the electrolytic hydrogen production system without cooling water is described in detail below.

[0078] Figure 5 1 is a flow chart of a control method for a hydrogen production system without cooling water by electrolysis according to an embodiment of the present application. The control method for a hydrogen production system without cooling water by electrolysis is applied to the hydrogen production system without cooling water in the above embodiment and is executed by a controller in the hydrogen production system without cooling water by electrolysis. Figure 5 As shown, the control method of the electrolytic hydrogen production system without cooling water may include the following steps:

[0079] Step 510: Acquire multiple thermal parameters of the electrolytic cell and the post-processing module without cooling water.

[0080] Step 520: Determine the calorific value of the electrolytic cell according to various heat parameters.

[0081] Step 530: Determine the operating current and operating voltage of the electrolytic cell according to the heat generated by the electrolytic cell, and control the electric energy output by the power supply device based on the operating current and operating voltage.

[0082] For ease of understanding, the setting principle of the operation strategy of the embodiment of the present application is first introduced in detail. Figure 6 This is a curve showing the relationship between the voltage and the electrolytic current of the electrolytic cell of an example of the present application. Figure 7 This is a curve showing the relationship between the voltage of the electrolytic cell and the calorific value of the electrolytic cell, which is an example of the present application.

[0083] The operation strategy of the electrolytic hydrogen production system without cooling water in this embodiment is inspired by the operation characteristics of the electrolyzer, which is a common technology and has great practical significance. Specifically, the thermoneutral voltage of the electrochemical reaction of the electrolyzer is usually 1.48V, that is, the voltage of the electrolytic chamber of the electrolyzer must be greater than or equal to 1.48V to successfully complete the water electrolysis chemical reaction and produce hydrogen and oxygen.

[0084] like Figure 6As shown in the figure, the electrolysis chamber voltage V1 corresponds to the electrolysis current A1, the electrolysis chamber voltage V2 corresponds to the electrolysis current A2, and almost no current passes when the electrolysis chamber voltage is less than 1.48V. It can be seen that as the electrolysis chamber voltage increases, the electrolysis current also increases, and the two changes are positively correlated. The size of the electrolysis chamber voltage of the electrolytic cell determines the level of electrolysis energy consumption. The larger the electrolysis chamber voltage, the greater the unit energy consumption of the electrolytic cell and the lower the energy efficiency. Therefore, energy consumption is proportional to the electrolysis chamber voltage. It can be seen that the most effective measure to reduce energy consumption and improve energy efficiency is to reduce the electrolysis chamber voltage.

[0085] Furthermore, the size of the electrolysis current determines the gas production of the electrolyzer, and the electrolysis current is equal to the product of the electrolysis area and the current density. The larger the electrolysis current, the greater the gas production of the electrolyzer, and the electrolysis current is directly proportional to the gas production. In order to increase the gas production of the electrolyzer, the industry usually increases the gas production by increasing the current density. However, the greater the current density, the more intense the electrochemical reaction, which makes it easier for the electrode surface coating to fall off, and it is very easy to cause the electrolyzer performance to decay rapidly.

[0086] The operation strategy of the embodiment of the present application is to make the electrolyzer in a high energy efficiency, low load parameter group (i.e. Figure 6 Operating under V1, A1) in the figure can significantly reduce the attenuation of electrolytic cell performance, extend the service life of the electrolytic cell, and improve the energy efficiency of the electrolytic cell.

[0087] like Figure 7 As shown, the electrolytic chamber voltage V is positively correlated with the electrolytic cell calorific value Q. The electrolytic chamber voltage V1 corresponds to the electrolytic cell calorific value Q1, and the electrolytic chamber voltage V2 corresponds to the electrolytic cell calorific value Q2, that is, the higher the electrolytic chamber voltage, the greater the electrolytic cell calorific value.

[0088] As the voltage of the electrolysis chamber increases from 1.48V, the waste heat from the electrochemical reaction of the electrolyzer begins to heat the electrolyzer and the post-processing module of the entire hydrogen production system; when the heat generated by the electrolyzer is Q1, the heat generated can maintain the electrolyzer and the entire system in a stable operation at a working temperature of 90℃±5℃ for a long time under the natural thermal balance of the environment.

[0089] As the voltage of the electrolysis chamber is greater than V1 and less than V2, the heat generated by the electrolyzer will also be greater than Q1 and less than Q2. At this time, the entire electrolysis hydrogen production system without cooling water requires additional cooling water heat exchange to remove the heat of the difference between Q2 and Q1 from the system to maintain the operating temperature. Therefore, the operation strategy of this embodiment is to operate the electrolyzer under the parameters corresponding to the heat generation of Q1, that is, the electrolyzer operates under the parameter group conditions of V1, A1, Q1, and 90℃±5℃, thereby eliminating the need for cooling water heat exchange process facilities.

[0090] Figure 8This is a curve showing the relationship between the electrolytic cell voltage and the electrolysis energy efficiency of an example of the present application.

[0091] like Figure 8 As shown in the figure, the electrolytic cell voltage is inversely proportional to the electrolytic energy efficiency, that is, the smaller the electrolytic cell voltage, the higher the system energy efficiency, and it can be infinitely close to 100%; the larger the electrolytic cell voltage, the lower the system energy efficiency. Figure 8 As shown, the electrolysis chamber voltage V1 corresponds to the energy efficiency η1, and the electrolysis chamber voltage V2 corresponds to the energy efficiency η2. The energy efficiency of the water electrolysis hydrogen production system in the prior art is generally about 75% to 80%, and the energy efficiency level is relatively low. The operation of the water electrolysis hydrogen production system requires huge electricity, and the level of energy efficiency of large-scale green hydrogen production directly determines the cost competitiveness of hydrogen production. Therefore, the operating strategy of this embodiment enables the electrolysis chamber of the electrolyzer to operate under the voltage V1 parameter, thereby obtaining a higher system energy efficiency η1, which can make the water electrolysis hydrogen production system energy efficiency reach about 90%, greatly saving the cost of electricity hydrogen production and improving the core competitiveness of the hydrogen production process.

[0092] After understanding the operating strategy setting principle of the embodiment of the present application, the control method of the controller under the operating strategy is introduced in detail below.

[0093] Specifically, before the electrolytic hydrogen production system is operated, basic operating parameters of the electrolytic hydrogen production system, such as hydrogen production, operating temperature, etc., may be set first.

[0094] Furthermore, multiple thermal parameters of the electrolyzer and post-processing module in the absence of cooling water can be obtained, that is, the source of heat generated and the heat release path when the electrolysis hydrogen production system is working can be determined, so as to calculate the heat generation in the absence of cooling water and the electrolysis hydrogen production system in a natural thermal equilibrium state.

[0095] It should be noted that the heat parameters can be obtained by simulating and calculating the relevant parameters. The specific calculation process of the heat parameters can refer to the existing process and will not be repeated here.

[0096] In some embodiments, the thermal parameters include a first thermal parameter, a second thermal parameter, a third thermal parameter, a fourth thermal parameter, and a fifth thermal parameter.

[0097] Among them, the first heat parameter is the heat required for the electrolytic hydrogen production system without cooling water to be heated from the ambient temperature to the corresponding working temperature; the second heat parameter is the heat required for the raw water in the electrolyzer to be heated from the ambient temperature to the corresponding working temperature; the third heat parameter is the heat taken away when the hydrogen and oxygen prepared in the electrolyzer are discharged; the fourth heat parameter is the heat consumed when water evaporates in the post-processing module; the fifth heat parameter is the heat released by the electrolyzer and the post-processing module to the surrounding environment by thermal radiation convection at the corresponding working temperature.

[0098] It is worth mentioning that, because the cooling water-free electrolysis hydrogen production system of the embodiment of the present application has no cooling water-related equipment, the heat removed by the cooling water during heat exchange is 0, and the heat removed by the cooling water during heat exchange does not need to be involved in the heat balance calculation.

[0099] Specifically, the first heat parameter is the heat required for the electrolytic hydrogen production system without cooling water to be heated from the ambient temperature to the corresponding operating temperature, which may specifically include the heat required for heating the electrolyzer equipment, the electrolyte in the system, and the containers and pipes in the post-processing module. The first heat parameter may be calculated by using the system's operating temperature, ambient temperature, and the total mass of the electrolyzer equipment, electrolyte, containers and pipes in the post-processing module, and the average specific heat capacity of these materials. The specific calculation process can refer to the existing calculation process, which will not be repeated here.

[0100] The second heat parameter is the heat required to heat the raw water in the electrolyzer from the ambient temperature to the corresponding operating temperature. The second heat parameter can be calculated by using the mass of the raw water for electrolysis, the specific heat capacity of the water, the operating temperature of the system and the ambient temperature. The specific calculation process can refer to the existing calculation process, which will not be repeated here.

[0101] The third heat parameter is the heat taken away when the hydrogen and oxygen prepared in the electrolyzer are discharged. The third heat parameter can be calculated by using the mass and specific heat capacity of the generated hydrogen and oxygen, the operating temperature of the system, and the temperature when the gas is discharged. The specific calculation process can refer to the existing calculation process and will not be repeated here.

[0102] The fourth heat parameter is the heat consumed when water evaporates in the post-processing module. The fourth heat parameter can be calculated by using the mass of evaporated water and the latent heat of vaporization of water. The specific calculation process can refer to the existing calculation process and will not be repeated here.

[0103] The fifth heat parameter is the heat released by the electrolytic cell and the post-processing module to the surrounding environment by thermal radiation and convection at the corresponding working temperature, that is, the heat released by the electrolytic cell and the post-processing module to the surrounding environment by thermal radiation and convection at the working temperature. The fifth heat parameter can be calculated by using the electrode surface area, surface emissivity, convection heat transfer coefficient, and the working temperature and ambient temperature of the system. The specific calculation process can refer to the existing calculation process, which will not be repeated here.

[0104] In some embodiments, the control method may further include: determining the temperature difference and heat exchange conditions of the hydrogen production system by electrolysis based on the ambient temperature of the area where the hydrogen production system is located and the operating temperature of the electrolyzer, wherein the heat exchange conditions include at least the surface characteristics of the electrolyzer, and the orientation and number of doors and windows of the hydrogen production station where the hydrogen production system is located; and determining a fifth thermal parameter based on the temperature difference and the heat exchange conditions.

[0105] It should be noted that the surface property of the electrolytic cell may be surface roughness.

[0106] It is understandable that the operating temperature of the water electrolysis hydrogen production system is generally 90°C ± 5°C. The prior art controls the operating temperature of the hydrogen production system by controlling and adjusting the cooling water flow rate. When the temperature is too high, the cooling water flow rate is increased, and when the temperature is low, the cooling water flow rate is reduced. The electrolysis hydrogen production system in the embodiment of the present application maintains a stable operating temperature in an environment without cooling water. A relatively large portion of the heat generated by the electrolytic cell must be output through heat exchange with the natural ambient air to achieve self-balance of the system temperature.

[0107] When the electrolytic hydrogen production system is working, after the electrolyzer is heated, the heat will drive the temperature of the containers and pipes in the post-processing system to rise with the flow of electrolyte, hydrogen and oxygen, and finally rise to the working temperature. The heat transfer from the high-temperature surface of the electrolyzer and post-processing system of the electrolytic hydrogen production system to the air mainly relies on radiation and convection. Radiation transfers heat by emitting electromagnetic waves. The magnitude of radiation heat transfer is related to the temperature and surface characteristics of the hydrogen production system. The higher the temperature and the rougher the surface characteristics, the better the radiation heat transfer effect; while convection is the transfer of heat through the convection of the fluid. When the surface of the high-temperature hydrogen production system contacts the air, the air will be heated and rise, and the cold air will sink to replace the original hot air. The effect of convection heat transfer depends on factors such as air fluidity, temperature difference and surface shape. Generally speaking, the greater the air flow and the greater the temperature difference, the better the convection heat transfer effect. The two methods interact with each other, thereby jointly promoting the transfer of heat from the high-temperature surface to the air.

[0108] Therefore, the fifth heat parameter can be calculated by the temperature difference, air flow and surface characteristics of the electrolyzer. Specifically, the annual average temperature in a province in northern my country is 7.6°C and the wind is strong, and the annual average temperature in a province in the south is 25.6°C, which is hot. The temperature difference between the north and the south is obvious. Therefore, when the cooling water-free electrolytic hydrogen production system of the embodiment of the present application is designed and operated, the relevant temperature difference and heat exchange conditions must be accurately determined according to the actual ambient temperature of the specific application scenario.

[0109] Furthermore, for heat exchange conditions, the heat dissipation effect of hydrogen production equipment and air convection can be improved by optimizing the orientation, size, number and other facilities of the hydrogen production workshop doors and windows according to the climate characteristics of the application scenario. The surface heat exchange characteristics of the electrolytic hydrogen production system can also be improved by increasing the surface roughness of the electrolyzer and post-processing system.

[0110] In some embodiments, step 520 determines the heat generation of the electrolytic cell according to each heat parameter, which may include: summing the first heat parameter, the second heat parameter, the third heat parameter, the fourth heat parameter and the fifth heat parameter to obtain the total heat consumption; the heat generation of the electrolytic cell is the total heat consumption.

[0111] Specifically, the total heat consumption can be calculated based on the first heat parameter, the second heat parameter, the third heat parameter, the fourth heat parameter and the fifth heat parameter using the heat balance principle. If the first heat parameter is recorded as q1, the second heat parameter is recorded as q2, the third heat parameter is recorded as q3, the fourth heat parameter is recorded as q4, and the fifth heat parameter is recorded as q5, the total heat consumption Q can be calculated by the following formula:

[0112] Q=q1+q2+q3+q4+q5

[0113] After obtaining the first heat parameter, the second heat parameter, the third heat parameter, the fourth heat parameter and the fifth heat parameter, these parameters can be substituted into the above formula to calculate the total heat consumption. It should be noted that the total heat consumption is the heat that the entire electrolysis hydrogen production system without cooling water needs to consume in theory.

[0114] Furthermore, the heat generated by the electrolytic cell is equal to the total heat consumption calculated above. After the heat generated by the electrolytic cell is determined, since the heat generated by the electrolytic cell Q depends entirely on the operating current I and the operating voltage U during operation; and the materials, processes and structures used have been determined during product design, the operating characteristic curve of the electrolytic cell is basically finalized, and the operating current I and the operating voltage U under the heat generation can be determined based on the operating characteristic curve of the electrolytic cell. After determining the operating current and the operating voltage, the controller can control the power supply device 300 to output the corresponding electric energy.

[0115] The economic benefits of the cooling water-free electrolysis hydrogen production system and its control method according to the embodiment of the present application are analyzed using a specific example.

[0116] It is understandable that about 80% of the operating cost of hydrogen production in the electrolytic hydrogen production system without cooling water is electricity cost. The electrolyzer is the source of energy consumption. Here, the economic factors are analyzed from the perspective of the electrolyzer, which accounts for the main contradiction of electricity consumption. Assuming that the industrial average electricity price in the hydrogen production scenario is 0.5 yuan / kwh, the annual hydrogen production capacity of a hydrogen production plant is 35,700 tons, that is, 4×10 8 Take the bidder as an example.

[0117] In the prior art, the design current density of a certain type of water electrolysis hydrogen production equipment under rated operating conditions is about 3000A / ㎡ (current density multiplied by electrolysis area equals electrolysis current), and the voltage of the electrolysis chamber of the hydrogen production equipment under continuous and stable operation is 1.84V. Based on the standard algorithm, the unit hydrogen production energy consumption of this type of hydrogen production equipment is: 1.84×2.39=4.398kwh / Nm 3 , the unit hydrogen production cost is: 4.398×0.5=2.199 yuan / Nm 3 The actual annual electricity consumption of the hydrogen production plant is: 4.398×4×10 8 ×0.5=879.6 million yuan.

[0118] If the operation strategy (i.e., control method) provided in this embodiment is adopted, the current density during operation is about 2000A / ㎡. Under this operation parameter, the electrolytic hydrogen production system without cooling water can reach natural thermal equilibrium at the system operating temperature without cooling water supply, and realize continuous and stable operation. In this state, the voltage of the electrolytic chamber is 1.75V. Based on the standard algorithm, the unit energy consumption of the electrolytic hydrogen production system without cooling water in this embodiment is: 1.75×2.39=4.183kwh / Nm 3 , the unit hydrogen production cost is: 4.183×0.5=2.091 yuan / Nm 3 , the actual annual electricity consumption cost in this application scenario is: 4.183×4×10 8 ×0.5=836.6 million yuan.

[0119] It can be seen that under the cooling water-free electrolytic hydrogen production system and operation strategy provided in this embodiment, the unit hydrogen production cost can be saved by 2.199-2.091=0.108 yuan / Nm 3 The annual electricity savings are 879.6 million-836.6 million=43 million yuan, and the economic benefits are very considerable. The larger the scale of hydrogen production, the higher the electricity price in the industrial environment, and the more obvious the benefits.

[0120] The electrolytic hydrogen production system without cooling water and its control method of this embodiment, based on the operating characteristics of the electrolyzer product, operates the electrolyzer in a high energy efficiency and low current density mode, improves the energy efficiency of the electrolytic hydrogen production system without cooling water, and delays the performance degradation of the electrolytic hydrogen production system without cooling water. According to the control method proposed in the embodiment of the present application, the heat generation of the electrolyzer in the electrolytic hydrogen production system without cooling water is limited, and all the heat generated by the electrochemical reaction of the electrolyzer is only used to maintain the heat required for the working temperature of the electrolytic hydrogen production system without cooling water; when the electrolytic hydrogen production system without cooling water is operated at rated conditions, no excess heat will be generated, so the operating temperature of the hydrogen production system can be effectively controlled during long-term stable operation. As a result, there is no need to cool and exchange heat for the electrolytic hydrogen production system without cooling water, remove some functions of the heat exchanger in the prior art, realize electrolytic hydrogen production without cooling water, and improve the applicability and economic benefits of the electrolytic hydrogen production system without cooling water. The cooling water-free electrolytic hydrogen production system and control method thereof proposed in the embodiments of the present application can be more suitable for areas with scarce water resources, and solve the problems encountered in building hydrogen production plants or stations in areas with relatively scarce water resources.

[0121] It should be noted that for details not disclosed in the control method of the hydrogen production system by electrolysis without cooling water in this embodiment, please refer to the details disclosed in the embodiment of the hydrogen production system by electrolysis without cooling water in the embodiments of this specification, and no further details will be given here.

[0122] Based on the above embodiments, Fig. 9 An example of a physical structure diagram of a controller is shown below: Fig. 9 As shown, the controller may include: a processor 910, a communication interface 920, a memory 930 and a communication bus 940, wherein the processor 910, the communication interface 920 and the memory 930 communicate with each other through the communication bus 940. The processor 910 may call the logic instructions in the memory 930 to execute a control method for a hydrogen electrolysis system without cooling water, the method comprising: obtaining multiple heat parameters of an electrolyzer and a post-processing module without cooling water; determining the heat generated by the electrolyzer according to each heat parameter; determining the operating current and operating voltage of the electrolyzer according to the heat generated by the electrolyzer, and controlling the electric energy output by the power supply device based on the operating current and operating voltage.

[0123] In addition, the logic instructions in the above-mentioned memory 930 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0124] On the basis of the above embodiments, on the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the electrolysis hydrogen production system without cooling water provided by the above methods, the method including: obtaining multiple thermal parameters of the electrolyzer and the post-processing module in the absence of cooling water; determining the calorific value of the electrolyzer according to each thermal parameter; determining the operating current and operating voltage of the electrolyzer according to the calorific value of the electrolyzer, and controlling the electric energy output by the power supply device based on the operating current and the operating voltage.

[0125] On the basis of the above embodiments, on another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the control method of the electrolysis hydrogen production system without cooling water provided by the above methods, the method comprising: obtaining multiple thermal parameters of the electrolyzer and the post-processing module in the absence of cooling water; determining the calorific value of the electrolyzer according to the thermal parameters; determining the operating current and operating voltage of the electrolyzer according to the calorific value of the electrolyzer, and controlling the electric energy output by the power supply device based on the operating current and the operating voltage.

[0126] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0127] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

Claims

1. A cooling water-free electrolytic hydrogen production system, characterized in that: It includes an electrolytic cell and a post-processing module and a power supply device connected to the electrolytic cell; The electrolyzer is used to produce hydrogen and oxygen through electrochemical reactions, and output hydrogen and oxygen; The post-processing module comprises a gas-liquid separation unit, a gas washing unit and a gas filtering unit which are connected in sequence, and the post-processing module is used to process the hydrogen and oxygen output by the electrolyzer and output hydrogen and oxygen that meet the regulations; The power supply device is used to provide electrical energy to the electrolytic cell; Wherein, the heat consumed by the electrolytic cell and the post-processing module in the absence of cooling water is the same as the total heat generated.

2. The cooling water-free electrolysis hydrogen production system according to claim 1, characterized in that: The electrolytic cell and the post-processing module are connected via a first channel and a second channel; The gas-liquid separation unit comprises a first separator and a second separator, the first separator is connected to the first channel, and the second separator is connected to the second channel; The first separator is used to separate the hydrogen outputted from the electrolyzer into gas and liquid, and the second separator is used to separate the oxygen outputted from the electrolyzer into gas and liquid.

3. The cooling water-free electrolytic hydrogen production system according to claim 2, characterized in that: The gas scrubbing unit comprises a first scrubber and a second scrubber; The first scrubber is connected to the first separator, and the second scrubber is connected to the second separator; The first scrubber is used to scrub the hydrogen output from the first separator, and the second scrubber is used to scrub the oxygen output from the second separator.

4. The cooling water-free electrolytic hydrogen production system according to claim 3, characterized in that: The gas filter unit includes a first filter and a second filter; The first filter is connected to the first scrubber, and the second filter is connected to the second scrubber; The first filter is used to filter and separate gas and water from the hydrogen output by the first scrubber, and the second filter is used to filter and separate gas and water from the oxygen output by the second scrubber.

5. The cooling water-free electrolysis hydrogen production system according to any one of claims 1 to 4, characterized in that: The system also includes a controller; The controller is used to obtain multiple thermal parameters of the electrolytic cell and the post-processing module in the absence of cooling water, and determine the calorific value of the electrolytic cell according to each of the thermal parameters, and determine the operating current and operating voltage of the electrolytic cell according to the calorific value of the electrolytic cell, and the operating current and the operating voltage are used to determine the electric energy output by the power supply device; The controller is an independent device or integrated in the power supply device.

6. The cooling water-free electrolytic hydrogen production system according to claim 1, characterized in that: The amount of water consumed by the electrolytic hydrogen production system for producing unit hydrogen production is x, the universal rated water consumption for the electrolytic hydrogen production system for producing unit hydrogen production is N, and x is less than N.

7. A control method for a cooling water-free electrolytic hydrogen production system, characterized in that: Applied to the cooling water-free electrolysis hydrogen production system as claimed in any one of claims 1 to 5, the method comprising: Obtain multiple thermal parameters of the electrolyzer and post-processing module without cooling water; Determine the calorific value of the electrolytic cell according to each of the thermal parameters; The operating current and the operating voltage of the electrolytic cell are determined according to the heat generated by the electrolytic cell, and the electric energy output by the power supply device is controlled based on the operating current and the operating voltage.

8. The control method of the electrolytic hydrogen production system without cooling water according to claim 7, characterized in that: The heat parameters include a first heat parameter, a second heat parameter, a third heat parameter, a fourth heat parameter and a fifth heat parameter; Wherein, the first heat parameter is the heat required for the electrolysis hydrogen production system to be heated from ambient temperature to the corresponding operating temperature; The second heat parameter is the heat required to heat the raw water in the electrolytic cell from the ambient temperature to the corresponding working temperature; The third heat parameter is the heat taken away when the hydrogen and oxygen prepared in the electrolyzer are discharged; The fourth heat parameter is the heat consumed when water evaporates in the post-processing module; The fifth heat parameter is the amount of heat released by the electrolytic cell and the post-processing module to the surrounding environment by thermal radiation and convection at the corresponding operating temperature.

9. The control method of the electrolytic hydrogen production system without cooling water according to claim 8, characterized in that: Determining the calorific value of the electrolytic cell according to each of the heat parameters comprises: The first heat parameter, the second heat parameter, the third heat parameter, the fourth heat parameter and the fifth heat parameter are summed to obtain the heat value of the electrolytic cell.

10. The control method of the electrolytic hydrogen production system without cooling water according to claim 8, characterized in that: The method further comprises: Determine the temperature difference and the heat exchange condition of the hydrogen production system by electrolysis according to the ambient temperature of the area where the hydrogen production system by electrolysis is located and the operating temperature of the electrolyzer, wherein the heat exchange condition at least includes the surface characteristics of the electrolyzer, the orientation and number of doors and windows of the hydrogen production station where the hydrogen production system by electrolysis is located; The fifth thermal parameter is determined based on the temperature difference and the heat exchange condition.

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