Hydrogen production system

Abstract

The utility model provides a hydrogen production system, and relates to the technical field of hydrogen production. The system is characterized in that a discharge port of an electrolytic cell is communicated with a feed port of a separation pry through a connecting pipeline, and a feed port of the electrolytic cell is communicated with a discharge port of the separation pry through a connecting pipeline; an alkali liquor heat exchanger is arranged in the separation pry, a heater is arranged on the alkali liquor heat exchanger, a liquid outlet of the alkali liquor heat exchanger is communicated with a liquid inlet of the cooling-water machine through the connecting pipeline and is provided with a first valve, and a liquid outlet of the cooling-water machine is communicated with a liquid inlet of the alkali liquor heat exchanger through the connecting pipeline; a gas inlet of the purification pry is communicated with a gas outlet of the separation pry through the connecting pipeline, and a gas outlet of the purification pry is communicated with a gas inlet of the first hydrogen storage tank through the connecting pipeline. According to the system, energy waste in the hydrogen production process is reduced, and the hydrogen production cost is reduced.

Description

Technical Field

[0001] This application relates to the field of hydrogen production technology, and more particularly to a hydrogen production system. Background Technology

[0002] Hydrogen energy, due to its renewable and environmentally friendly characteristics, has been widely used in various fields, including transportation, industrial manufacturing, power generation, and residential heating. The method of hydrogen production has become particularly important, directly impacting whether hydrogen energy can truly achieve its green and sustainable development goals. Among the many hydrogen production methods, green hydrogen production is gradually becoming the mainstream trend in the industry.

[0003] In practical hydrogen production operations, alkaline electrolyzers are a common equipment choice. However, due to the cyclical fluctuations in various renewable energy sources such as wind and solar power, alkaline electrolyzers frequently face shutdowns and startups, leading to high energy consumption due to the instability of green electricity supply. These challenges place higher demands on the efficiency and economy of the hydrogen production process. Diaphragm compressors play a crucial role in hydrogen compression. During hydrogen compression, a large amount of heat is generated. Current technologies mostly rely on cooling water to displace this heat and release it into the environment, resulting in significant energy waste. Utility Model Content

[0004] This application provides a hydrogen production system to reduce energy waste and hydrogen production costs during the hydrogen production process.

[0005] In a first aspect, this application provides a hydrogen production system, the system comprising:

[0006] Electrolyzer, connecting pipes, separation skid, chiller, purification skid, first hydrogen storage tank, compressor, second hydrogen storage tank and controller;

[0007] The discharge port of the electrolytic cell is connected to the feed port of the separation skid via a connecting pipe, the feed port of the electrolytic cell is connected to the discharge port of the separation skid via a connecting pipe, and a circulation pump is installed on the connecting pipe between the electrolytic cell and the separation skid. A temperature sensor is installed inside the electrolytic cell.

[0008] The separation skid is equipped with an alkaline heat exchanger, which has a heater. The outlet of the alkaline heat exchanger is connected to the inlet of the chiller via a connecting pipe and is equipped with a first valve. The outlet of the chiller is connected to the inlet of the alkaline heat exchanger via a connecting pipe. A delivery pump and a second valve are sequentially installed on the connecting pipe between the outlet of the chiller and the inlet of the alkaline heat exchanger.

[0009] The air inlet of the purification skid is connected to the exhaust port of the separation skid via a connecting pipe. The exhaust port of the purification skid is connected to the air inlet of the first hydrogen storage tank via a connecting pipe. The pressure in the first hydrogen storage tank is lower than the pressure in the second hydrogen storage tank.

[0010] The compressor's inlet is connected to the exhaust port of the first hydrogen storage tank via a connecting pipe. The compressor is equipped with a hydrogen heat exchanger, whose outlet is connected to the inlet of the alkali heat exchanger and the inlet of the chiller via connecting pipes. A third valve is installed on the connecting pipe between the outlet of the hydrogen heat exchanger and the inlet of the chiller. A branch pipe is installed on the connecting pipe between the outlet of the hydrogen heat exchanger and the inlet of the alkali heat exchanger, and a fourth valve is installed on the branch pipe.

[0011] The inlet of the second hydrogen storage tank is connected to the outlet of the compressor;

[0012] The controller is electrically connected to the electrolytic cell, separation skid, chiller, purification skid, compressor, first valve, second valve, third valve, fourth valve and transfer pump.

[0013] In one possible design, the heater is activated when the temperature sensor detects that the temperature of the alkaline solution in the electrolytic cell reaches 45°C.

[0014] In one possible design, the initial start-up condition of the electrolyzer is that the temperature sensor detects that the temperature of the alkaline solution in the electrolyzer reaches 75°C.

[0015] In one possible design, the initial start-up condition for the chiller is that the temperature sensor detects that the temperature of the alkaline solution in the electrolytic cell reaches 75°C.

[0016] In one possible design, the trigger condition for the simultaneous opening of the first and second valves is that the temperature sensor detects that the temperature of the alkaline solution in the electrolytic cell reaches 75°C.

[0017] In one possible design, the compressor is triggered to stop when the temperature sensor detects that the temperature of the alkaline solution in the electrolytic cell reaches 45°C.

[0018] In one possible design, the opening trigger condition for the third valve is that the hydrogen content in the first hydrogen storage tank reaches a preset threshold.

[0019] In one possible design, the first valve, the second valve, the third valve, and the fourth valve are all pneumatic ball valves.

[0020] In one possible design, a pressure sensor is installed on the connecting pipe between the compressor's inlet and the exhaust port of the first hydrogen storage tank, and the pressure sensor is electrically connected to the controller.

[0021] In one possible design, the temperature sensor has an accuracy of ±0.1℃.

[0022] This application provides a hydrogen production system in which the discharge port of an electrolyzer is connected to the inlet of a separation skid via a connecting pipe, and the inlet of the electrolyzer is connected to the discharge port of the separation skid via a connecting pipe. A circulation pump is installed on the connecting pipe between the electrolyzer and the separation skid, and a temperature sensor is installed inside the electrolyzer. An alkali heat exchanger is installed inside the separation skid, and a heater is installed on the alkali heat exchanger. The discharge port of the alkali heat exchanger is connected to the inlet of a chiller via a connecting pipe and is equipped with a first valve. The discharge port of the chiller is connected to the inlet of the alkali heat exchanger via a connecting pipe, and a transfer pump and a second valve are sequentially installed on the connecting pipe between the discharge port of the chiller and the inlet of the alkali heat exchanger. The gas inlet of a purification skid is connected to the exhaust port of the separation skid via a connecting pipe, and the exhaust port of the purification skid is connected to a first hydrogen storage tank via a connecting pipe. The compressor's inlet is connected to the exhaust port of the first hydrogen storage tank, and the pressure inside the first hydrogen storage tank is lower than that inside the second hydrogen storage tank. The compressor's inlet is connected to the exhaust port of the first hydrogen storage tank via a connecting pipe. The compressor is equipped with a hydrogen heat exchanger, whose outlet is connected to the inlet of the alkali heat exchanger and the inlet of the chiller via connecting pipes. A third valve is installed on the connecting pipe between the outlet of the hydrogen heat exchanger and the inlet of the chiller. A branch pipe is installed on the connecting pipe between the outlet of the hydrogen heat exchanger and the inlet of the alkali heat exchanger, and a fourth valve is installed on the branch pipe. The inlet of the second hydrogen storage tank is connected to the exhaust port of the compressor. The controller is electrically connected to the electrolyzer, separation skid, chiller, purification skid, compressor, first valve, second valve, third valve, fourth valve, and transfer pump. The following technical effects were achieved: High-precision temperature sensors were used to accurately detect the alkali solution temperature in the electrolyzer, enabling precise temperature control; heaters were installed on the alkali heat exchanger to ensure the electrolyzer started at a suitable temperature, effectively extending its service life; the heat generated by the compressor compressing hydrogen was used to preheat the alkali solution through connecting pipes and corresponding valves, improving energy efficiency and reducing additional energy input costs; intelligent linkage control between various devices allowed for timely cooling of the alkali solution during electrolyzer startup and stable operation, improving system stability and efficiency and reducing manual control. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the system architecture of a hydrogen production system provided in this application embodiment;

[0025] Figure 2 This is a schematic diagram of a hydrogen production system provided in an embodiment of this application;

[0026] Figure 3 This is a schematic flowchart of a hydrogen production system control method provided in an embodiment of this application.

[0027] Figure label:

[0028] 100-Electrolyzer; 200-Connecting Pipeline; 300-Separation Skid; 400-Chiller; 500-Purification Skid; 600-First Hydrogen Storage Tank; 700-Compressor; 800-Second Hydrogen Storage Tank; 900-Controller; 1000-Valve;

[0029] 1010 - First valve; 1020 - Second valve; 1030 - Third valve; 1040 - Fourth valve; 110 - Temperature sensor; 210 - Circulation pump; 220 - Transfer pump; 230 - Pressure sensor; 310 - Alkali heat exchanger; 320 - Heater; 710 - Hydrogen heat exchanger. Detailed Implementation

[0030] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application as detailed in the appended claims.

[0031] In the embodiments of this application, the terms "first" and "second" are used to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, nor do they necessarily imply difference. It should be noted that in the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design scheme described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner. In the embodiments of this application, "at least one" refers to one or more, and "more than one" refers to two or more.

[0032] It should be noted that the phrase "at...time" in the embodiments of this application can refer to the instant at which a certain situation occurs, or to a period of time after the occurrence of a certain situation; the embodiments of this application do not specifically limit this. Furthermore, the hydrogen production system provided in the embodiments of this application is merely an example; a hydrogen production system may include more or fewer components.

[0033] To facilitate a clear description of the technical solutions in the embodiments of this application, some terms and technologies involved in the embodiments of this application will be briefly introduced below:

[0034] Diaphragm compressor: A diaphragm compressor is a special type of positive displacement compressor that compresses gas through the reciprocating motion of a diaphragm. This design is particularly suitable for applications requiring high-purity gases or those highly sensitive to contamination. In this application, it is used to compress hydrogen.

[0035] Purification skid: A purification skid typically refers to an integrated system or assembly of equipment used for the purification of gases or liquids. It is primarily used to remove impurities from raw materials to meet specific process requirements or product quality standards. For hydrogen production, the purification skid is one of the key steps in ensuring the purity of the final hydrogen product.

[0036] Chillers: Chillers are devices used to provide constant-temperature, constant-flow cooling water, widely used in industrial production and laboratory environments. They remove heat from the object requiring cooling through a refrigeration cycle system, thereby achieving the purpose of cooling. Chillers play an important role in various application scenarios, including but not limited to cooling in manufacturing processes, temperature control of laboratory instruments, and thermal management of large data centers.

[0037] Separation skids: In industrial applications, separation typically refers to an integrated system of equipment specifically designed to separate desired components from a mixture. This equipment is usually designed as a modular unit for easy transport, installation, and operation. In hydrogen production and processing, separation skids are primarily used to remove impurities, ensuring the hydrogen purity meets the requirements of specific applications.

[0038] Alkali heat exchangers: Alkali heat exchangers are heat exchange devices specifically designed to handle solutions containing alkaline substances. They are used in many industrial processes, such as chemical, pharmaceutical, food processing, and alkaline water electrolysis for hydrogen production, to achieve efficient heat transfer and recovery.

[0039] Hydrogen energy, due to its renewable and environmentally friendly characteristics, has been widely used in many fields, including transportation, industrial manufacturing, power generation, and home heating. As a clean energy carrier, hydrogen energy plays an important role in promoting energy structure transformation and reducing greenhouse gas emissions.

[0040] The method of hydrogen production becomes particularly important because it directly affects whether hydrogen energy can truly achieve the goals of green and sustainable development.

[0041] Among the many hydrogen production methods, green hydrogen production is gradually becoming the mainstream trend in the industry. Green hydrogen production refers to using renewable energy sources (such as solar energy and wind energy) to drive the electrolysis of water to produce hydrogen.

[0042] Currently, most methods involve using alkaline electrolyzers to decompose water into hydrogen and oxygen under the influence of an electric current. Existing technologies typically utilize the coordination of alkaline electrolyzers, diaphragm compressors, and control pumps to produce hydrogen.

[0043] However, due to the cyclical fluctuations in the availability of renewable resources such as wind and solar power, alkaline electrolyzers often experience insufficient green electricity supply, leading to frequent shutdowns and restarts. These frequent startups and shutdowns consume significant amounts of energy and increase the cost of hydrogen production.

[0044] Diaphragm compressors play a crucial role in hydrogen compression. During hydrogen compression, a significant amount of heat is generated. This heat is typically displaced by cooling water and then directly released into the environment, resulting in substantial energy waste.

[0045] Considering that most green hydrogen production processes operate using alkaline electrolyzers and diaphragm compressors, this application aims to reduce energy waste in the hydrogen production process based on equipment such as alkaline electrolyzers and diaphragm compressors.

[0046] How to reduce energy waste and the cost of hydrogen production is an urgent problem that needs to be solved.

[0047] Based on this, the embodiments of this application provide a hydrogen production system that can be used in the field of hydrogen production technology, aiming to solve the above-mentioned technical problems of the prior art.

[0048] Figure 1 This is a schematic diagram of the system architecture of a hydrogen production system provided in an embodiment of this application. It should be noted that... Figure 1 The examples shown are merely examples of system architectures that can be applied to the embodiments of this application, in order to help those skilled in the art understand the technical content of this application, but do not mean that the embodiments of this application cannot be used in other devices, systems, environments or scenarios.

[0049] like Figure 1 As shown, the system architecture of a hydrogen production system includes: an electrolyzer 100, a connecting pipe 200, a separation skid 300, a chiller 400, a purification skid 500, a first hydrogen storage tank 600, a compressor 700, a second hydrogen storage tank 800, a controller 900, and valves 1000.

[0050] The feed inlet of the electrolytic cell 100 is connected to the discharge outlet of the separation skid 300 via a connecting pipe 200; the discharge outlet of the electrolytic cell 100 is connected to the feed inlet of the separation skid 300 via a connecting pipe 200.

[0051] The separation skid 300 internally includes an alkali heat exchanger and a heater, with the heater mounted on the alkali heat exchanger. The inlet of the alkali heat exchanger is connected to the outlet of the chiller 400; the outlet of the alkali heat exchanger is connected to the inlet of the chiller 400 via a connecting pipe 200.

[0052] The exhaust port of the separation skid 300 and the inlet of the purification skid 500 are connected via a connecting pipe 200 and a first valve. The exhaust port of the purification skid 500 and the inlet of the first hydrogen storage tank 600 are connected via a connecting pipe 200.

[0053] The exhaust port of the first hydrogen storage tank 600 is connected to the inlet of the compressor 700 via a connecting pipe 200 and a pressure sensor. The exhaust port of the compressor 700 is connected to the inlet of the second hydrogen storage tank 800 via a connecting pipe 200. The compressor 700 includes a hydrogen heat exchanger, the liquid inlet of which is connected to the liquid outlet of the chiller 400. The liquid outlet of the hydrogen heat exchanger and the liquid inlet of the chiller 400 can be connected via a connecting pipe 200 and a valve 1000.

[0054] In addition, the hydrogen production system also includes a controller 900. The controller 900 is electrically connected to all the aforementioned equipment to achieve intelligent control.

[0055] Figure 2 This is a schematic diagram of a hydrogen production system provided in an embodiment of this application. This embodiment... Figure 1 Based on this, the hydrogen production system will be described in detail. Figure 2 The middle arrow indicates the direction of flow. For example... Figure 2 As shown, the components include an electrolytic cell 100, a connecting pipe 200, a separation skid 300, a chiller 400, a purification skid 500, a first hydrogen storage tank 600, a compressor 700, a second hydrogen storage tank 800, and a controller 900.

[0056] The discharge port of the electrolytic cell 100 is connected to the feed port of the separation skid 300 through the connecting pipe 200, the feed port of the electrolytic cell 100 is connected to the discharge port of the separation skid 300 through the connecting pipe 200, and a circulation pump 210 is provided on the connecting pipe 200 between the electrolytic cell 100 and the separation skid 300. A temperature sensor 110 is provided inside the electrolytic cell 100.

[0057] The separation skid 300 is equipped with an alkaline heat exchanger 310, which is equipped with a heater 320. The drain port of the alkaline heat exchanger 310 is connected to the inlet of the chiller 400 through a connecting pipe 200 and is equipped with a first valve 1010. The drain port of the chiller 400 is connected to the inlet of the alkaline heat exchanger 310 through a connecting pipe 200. The connecting pipe 200 between the drain port of the chiller 400 and the inlet of the alkaline heat exchanger 310 is equipped with a transfer pump 220 and a second valve 1020 in sequence.

[0058] The air inlet of the purification skid 500 is connected to the exhaust port of the separation skid 300 through the connecting pipe 200. The exhaust port of the purification skid 500 is connected to the air inlet of the first hydrogen storage tank 600 through the connecting pipe 200. The pressure inside the first hydrogen storage tank 600 is lower than the pressure inside the second hydrogen storage tank 800.

[0059] The air inlet of the compressor 700 is connected to the exhaust port of the first hydrogen storage tank 600 through a connecting pipe 200. The compressor 700 is equipped with a hydrogen heat exchanger 710, wherein the liquid outlet of the hydrogen heat exchanger 710 is connected to the liquid inlet of the alkaline heat exchanger 310 and the liquid inlet of the chiller 400 through a connecting pipe 200. A third valve 1030 is provided on the connecting pipe 200 between the liquid outlet of the hydrogen heat exchanger 710 and the liquid inlet of the chiller 400. A branch pipe is provided on the connecting pipe 200 between the liquid outlet of the hydrogen heat exchanger 710 and the liquid inlet of the alkaline heat exchanger 310. A fourth valve 1040 is provided on the branch pipe.

[0060] The inlet of the second hydrogen storage tank 800 is connected to the outlet of the compressor 700;

[0061] The controller 900 is electrically connected to the electrolytic cell 100, the separation skid 300, the chiller 400, the purification skid 500, the compressor 700, the first valve 1010, the second valve 1020, the third valve 1030, the fourth valve 1040, and the transfer pump 220.

[0062] Specifically, the hydrogen production system also includes a circulation pump 210, a transfer pump 220, and a pressure sensor 230. The separation skid 300 includes an alkali heat exchanger 310 and a heater 320. The compressor 700 includes a hydrogen heat exchanger 710. The valve 1000 includes a first valve 1010, a second valve 1020, a third valve 1030, and a fourth valve 1040.

[0063] The electrolytic cell 100 includes an inlet and an outlet. The inlet of the electrolytic cell 100 and the outlet of the separation skid 300 are connected by a connecting pipe 200. The outlet of the electrolytic cell 100 and the inlet of the separation skid 300 are also connected by a connecting pipe 200, which includes a circulation pump 210. A temperature sensor 110 is installed inside the electrolytic cell 100.

[0064] The separation skid 300 has an exhaust port, which is connected to the air inlet of the purification skid 500 via a connecting pipe 200. The separation skid 300 includes an alkali heat exchanger 310 and a heater 320. The heater 320 is disposed above the alkali heat exchanger 310 and is used to heat the alkali solution.

[0065] The alkali heat exchanger 310 includes an inlet and an outlet. The outlet of the alkali heat exchanger 310 is connected to the inlet of the chiller 400 via a connecting pipe 200 and a first valve 1010 on this section of the connecting pipe 200. The inlet of the alkali heat exchanger 310 is connected to the outlet of the chiller 400 via the connecting pipe 200, a second valve 1020 on this section of the connecting pipe 200, and a transfer pump 220.

[0066] The exhaust port of the purification skid 500 is connected to the inlet of the first hydrogen storage tank 600 via a connecting pipe 200.

[0067] The exhaust port of the first hydrogen storage tank 600 and the air inlet of the compressor 700 are connected by a connecting pipe 200 and a pressure sensor 230 of this connecting pipe 200.

[0068] The compressor 700 includes a hydrogen heat exchanger 710. The hydrogen heat exchanger 710 includes an inlet and an outlet. The inlet of the hydrogen heat exchanger 710 can be connected to the outlet of the chiller 400 via a connecting pipe 200 and a transfer pump 220. The outlet of the hydrogen heat exchanger 710 can have two heat transfer paths: connection to the inlet of the chiller 400 and connection to the alkali heat exchanger 310. Specifically, the outlet of the hydrogen heat exchanger 710 can be connected to the inlet of the chiller 400 via a third valve 1030 and a connecting pipe 200. The outlet of the hydrogen heat exchanger 710 can be connected to the inlet of the alkali heat exchanger 310 via a connecting pipe 200 and a fourth valve 1040 of this connecting pipe 200, wherein this connecting pipe 200 includes a branch line with the fourth valve 1040.

[0069] The compressor 700 also includes an outlet, which is connected to the inlet of the second hydrogen storage tank 800. The first hydrogen storage tank 600 is a low-pressure hydrogen storage tank, and the second hydrogen storage tank 800 is a high-pressure hydrogen storage tank; that is, the pressure inside the first hydrogen storage tank 600 is lower than the pressure inside the second hydrogen storage tank 800.

[0070] The hydrogen production system also includes a controller 900. The controller 900 is electrically connected to the electrolyzer 100, separation skid 300, chiller 400, purification skid 500, compressor 700, first valve 1010, second valve 1020, third valve 1030, fourth valve 1040, transfer pump 220, and circulation pump 210 to achieve intelligent control of the equipment.

[0071] It is worth noting that in this embodiment, the connections between devices are all via connecting pipes 200, and the controller 900 is electrically connected to other devices. The devices in this embodiment can be installed via threaded connections (e.g., a circulating pump is installed on the connecting pipe), bolted connections (e.g., a heater is installed on the alkaline heat exchanger), or adhesive, snap-fit, or detachable connections (e.g., a temperature sensor is installed inside the electrolyzer 100). The connections in this embodiment can be detachable connections such as threaded connections between pipes or fixed connections such as welding. The specific installation and connection methods can be adjusted according to the actual hydrogen production system setup scenario and requirements; this embodiment does not impose any limitations on this.

[0072] This application provides a hydrogen production system in which the discharge port of an electrolyzer is connected to the inlet of a separation skid via a connecting pipe, and the inlet of the electrolyzer is connected to the discharge port of the separation skid via a connecting pipe. A circulation pump is installed on the connecting pipe between the electrolyzer and the separation skid, and a temperature sensor is installed inside the electrolyzer. An alkali heat exchanger is installed inside the separation skid, and a heater is installed on the alkali heat exchanger. The discharge port of the alkali heat exchanger is connected to the inlet of a chiller via a connecting pipe and is equipped with a first valve. The discharge port of the chiller is connected to the inlet of the alkali heat exchanger via a connecting pipe, and a transfer pump and a second valve are sequentially installed on the connecting pipe between the discharge port of the chiller and the inlet of the alkali heat exchanger. The gas inlet of a purification skid is connected to the exhaust port of the separation skid via a connecting pipe, and the exhaust port of the purification skid is connected to a first hydrogen storage tank via a connecting pipe. The compressor's inlet is connected to the exhaust port of the first hydrogen storage tank, and the pressure inside the first hydrogen storage tank is lower than that inside the second hydrogen storage tank. The compressor's inlet is connected to the exhaust port of the first hydrogen storage tank via a connecting pipe. The compressor is equipped with a hydrogen heat exchanger, whose outlet is connected to the inlet of the alkali heat exchanger and the inlet of the chiller via connecting pipes. A third valve is installed on the connecting pipe between the outlet of the hydrogen heat exchanger and the inlet of the chiller. A branch pipe is installed on the connecting pipe between the outlet of the hydrogen heat exchanger and the inlet of the alkali heat exchanger, and a fourth valve is installed on the branch pipe. The inlet of the second hydrogen storage tank is connected to the exhaust port of the compressor. The controller is electrically connected to the electrolyzer, separation skid, chiller, purification skid, compressor, first valve, second valve, third valve, fourth valve, and transfer pump. The following technical effects were achieved: High-precision temperature sensors were used to accurately detect the alkali solution temperature in the electrolyzer, enabling precise temperature control; heaters were installed on the alkali heat exchanger to ensure the electrolyzer started at a suitable temperature, effectively extending its service life; the heat generated by the compressor compressing hydrogen was used to preheat the alkali solution through connecting pipes and corresponding valves, improving energy efficiency and reducing additional energy input costs; intelligent linkage control between various devices allowed for timely cooling of the alkali solution during electrolyzer startup and stable operation, improving system stability and efficiency and reducing manual control.

[0073] In one possible design, the start-up trigger condition for heater 320 is that temperature sensor 110 detects that the temperature of the alkaline solution in electrolytic cell 100 reaches 45°C.

[0074] Specifically, the heater 320 is installed above the alkali heat exchanger 310 to further heat the alkali to the optimal operating temperature of the electrolytic cell 100.

[0075] During hydrogen compression, the heat generated by compressor 700 is transferred to chiller 400 through various heat exchange devices. Due to the limitation of compressor 700 exhaust temperature, the cooling water inside chiller 400 can reach 45°C after heat exchange. At this time, through the operation of alkali heat exchanger 310, heat is stably and efficiently transferred from cooling water to alkali solution, raising the temperature of alkali solution to 45°C.

[0076] When the temperature sensor 110 detects that the temperature of the alkali solution is 45°C, the heater 320 starts to work, heating the alkali solution to the optimal operating temperature of 80°C for the electrolytic cell 100.

[0077] The technical effect provided by this embodiment is that by heating the alkaline solution with a heater, the temperature of the reactants is kept stable, thereby accelerating the reaction rate of hydrogen production in the electrolyzer.

[0078] In one possible design, the initial start-up condition of the electrolytic cell 100 is that the temperature sensor 110 detects that the temperature of the alkaline solution in the electrolytic cell 100 reaches 75°C.

[0079] Specifically, the optimal operating temperature for electrolytic cell 100 is 80℃.

[0080] Temperature sensor 110 is a high-precision sensor and is installed inside electrolytic cell 100 to monitor the temperature of the alkaline solution inside electrolytic cell 100 in real time.

[0081] When the temperature sensor 110 detects that the alkaline solution temperature has reached 75°C, the electrolyzer 100 is at a suitable start-up temperature. The heater 320 is turned off, and the electrolyzer 100 is started to produce hydrogen.

[0082] The technical effect provided by this embodiment is that the electrolytic cell is officially started at 75°C, which improves the conductivity of the electrolytic cell, increases the electrolysis efficiency, accelerates the reaction rate, and ensures the stability of the system.

[0083] In one possible design, the initial start-up condition of the chiller 400 is that the temperature sensor 110 detects that the temperature of the alkaline solution in the electrolytic cell 100 reaches 75°C.

[0084] Specifically, the electrolytic cell 100 is officially started when the alkaline solution temperature reaches 75°C.

[0085] At this point, in order to ensure that the electrolytic cell 100 is maintained within a suitable operating temperature range, the chiller 400 needs to be started.

[0086] After the chiller 400 is started, the first valve 1010 and the second valve 1020 of the pneumatic ball valve need to be opened so that the cooling water can cool the alkaline solution.

[0087] The technical effect provided by this embodiment is that when the temperature of the alkaline solution in the electrolyzer reaches a certain threshold, the electrolyzer officially starts producing hydrogen. At this time, a chiller is provided to stabilize the temperature of the alkaline solution, ensuring that the electrolyzer is at a suitable operating temperature and ensuring the stability of the system.

[0088] In one possible design, the trigger condition for the simultaneous opening of the first valve 1010 and the second valve 1020 is that the temperature sensor 110 detects that the temperature of the alkaline solution in the electrolytic cell 100 reaches 75°C.

[0089] Specifically, since there are multiple valves 1000 in the heat exchange path between the chiller 400 and the alkaline heat exchanger 310, the first valve 1010 needs to be opened to connect the inlet of the chiller 400 with the outlet of the alkaline heat exchanger 310, and the second valve 1020 needs to be opened to connect the outlet of the chiller 400 with the inlet of the alkaline heat exchanger 310.

[0090] The technical effect provided by this embodiment is that, through the chiller, valves, and connecting pipes, heat exchange is carried out with the alkaline solution heat exchanger, so that the alkaline solution is maintained within a certain temperature range, thereby maintaining the hydrogen production efficiency of the electrolyzer.

[0091] In one possible design, the shutdown trigger condition for compressor 700 is that temperature sensor 110 detects that the temperature of the alkaline solution in electrolytic cell 100 reaches 45°C.

[0092] Specifically, before starting the electrolytic cell 100, the circulation pump 210 is started, so that the alkaline solution in the electrolytic cell 100 is transported from the drain port to the inlet of the separation skid 300; at the same time, after heat exchange through the separation skid 300, the alkaline solution is transported from the drain port of the separation skid 300 to the inlet of the electrolytic cell 100 to form an alkaline solution circulation path.

[0093] When the alkaline solution circulation path is formed, the diaphragm compressor 700 is started. The compressor 700 compresses the hydrogen supplied by the first hydrogen storage tank 600 and delivers it to the second hydrogen storage tank 800. A large amount of heat is generated during the compression of hydrogen.

[0094] It is worth noting that the chiller 400 is in the off state. The first pneumatic ball valve 1010 and the fourth pneumatic ball valve 1040 are in the open state, the second valve 1020 and the third valve 1030 are in the closed state, and the transfer pump 220 is in the open state.

[0095] The cooling water from the chiller 400 flows through the inlet of the hydrogen heat exchanger 710 via the transfer pump 220, and is then transported from the outlet of the hydrogen heat exchanger 710 and the fourth valve 1040 to the inlet of the alkali heat exchanger 310 to heat the alkali solution to 45°C. Finally, the cooling water flows back to the chiller 400 and the compressor 700 is shut down.

[0096] The technical effect provided by this embodiment is that a heat transfer path is constructed, and the compression heat generated by the compressor is used to heat the alkaline solution, thereby reducing energy consumption and improving energy utilization.

[0097] In one possible design, the opening trigger condition for the third valve 1030 is that the amount of hydrogen in the first hydrogen storage tank 600 reaches a preset threshold.

[0098] Specifically, when the hydrogen storage in the first hydrogen storage tank 600 reaches a preset threshold, the diaphragm compressor 700 is restarted to compress the hydrogen in the first hydrogen storage tank 600 into the second hydrogen storage tank 800.

[0099] At the same time, the third valve 1030 is opened, connecting the drain port of the hydrogen heat exchanger 710 to the inlet port of the chiller 400, to cool the compressed high-temperature hydrogen and ensure that the hydrogen is stored at a suitable temperature.

[0100] The technical effect provided by this embodiment is that, through data detection by multiple sensors, the controller can accurately adjust the operating status of each device based on the detection data, thereby ensuring the efficient and stable operation of the entire hydrogen production system.

[0101] In one possible design, the first valve 1010, the second valve 1020, the third valve 1030, and the fourth valve 1040 are all pneumatic ball valves.

[0102] Specifically, a pneumatic ball valve is a device that uses compressed air as a power source to control the opening or closing of a valve.

[0103] The first valve 1010, the second valve 1020, the third valve 1030, and the fourth valve 1040 are all pneumatic ball valves.

[0104] The technical advantages provided by this embodiment are that the use of a pneumatic ball valve allows for rapid circuit response; maintenance is simple; and automated control can be achieved.

[0105] In one possible design, a pressure sensor 230 is provided on the connecting pipe 200 between the air inlet of the compressor 700 and the exhaust port of the first hydrogen storage tank 600, and the pressure sensor 230 is electrically connected to the controller 900.

[0106] Specifically, the pressure sensor 230 is installed in the connecting pipe 200 between the first hydrogen storage tank 600 and the compressor 700.

[0107] The air inlet of the compressor 700 and the exhaust port of the first hydrogen storage tank 600 are connected to the pressure sensor 230 through the connecting pipe 200 to form an airflow path.

[0108] Pressure sensor 230 is electrically connected to controller 900.

[0109] The technical effect provided by this embodiment is that, by setting up a pressure sensor, the hydrogen pressure in the connected pipeline can be monitored in real time to ensure that it is within a safe range; by accurately monitoring the pressure, the working status of the compressor can be better controlled, thereby improving the operating efficiency of the system.

[0110] In one possible design, the temperature sensor 110 has an accuracy of ±0.1℃.

[0111] Specifically, the temperature sensor 110 is a high-precision temperature sensor 110 with an accuracy of ±0.1℃.

[0112] The technical effect provided by this embodiment is that by using a high-precision temperature sensor to monitor the temperature of the alkali solution in real time, the temperature can be accurately controlled, overcoming the problems of low electrolysis efficiency and short equipment life caused by improper temperature control.

[0113] This application also provides a hydrogen production system control method, applied to the controller of the hydrogen production system as described in the above system embodiments:

[0114] S301, Controller 900 starts circulation pump 210 to form an alkaline solution circulation path, and starts compressor 700 to compress hydrogen.

[0115] Figure 3 This is a schematic flowchart of a hydrogen production system control method provided in an embodiment of this application, as shown below. Figure 3 As shown, the controller 900 starts the alkali circulation pump 210. The alkali flows from the drain port of the electrolytic cell 100 through the circulation pump 210 and is pumped to the inlet of the separation skid 300. The drain port of the separation skid 300 is connected to the inlet of the electrolytic cell 100 through the connecting pipe 200, forming an alkali circulation path.

[0116] The chillers do not start until the alkali solution temperature reaches 75℃. The compressor 700 is started to compress the hydrogen, generating heat of compression. This opens the first valve 1010 and the fourth valve 1040 of the connecting pipe 200, while keeping the second valve 1020 and the third valve 1030 closed. The transfer pump 220 is then started. Cooling water flows from the chiller 400, passing first through the hydrogen heat exchanger 710 of the compressor 700 and then through the alkali solution heat exchanger 310 of the separation skid 300, finally returning to the chiller 400. The compressed heat is then discharged to heat the alkali solution.

[0117] When the temperature sensor 110 detects that the alkaline solution temperature reaches 45°C, the controller shuts down the compressor 700, closes the first valve 1010 and the fourth valve 1040, and keeps the second valve 1020 and the third valve 1030 closed.

[0118] At this point, the heater of the separation skid 300 starts working, continuing to heat the alkali solution.

[0119] S302, Controller 900 shuts down heater 320, starts electrolytic cell 100 and chiller 400, and opens first valve 1010 and second valve 1020.

[0120] When the temperature sensor 110 detects that the alkaline solution temperature reaches 75°C, the controller 900 controls the heater 320 to shut down and starts the electrolytic cell 100.

[0121] At the same time, the chiller is started, and the first valve 1010 and the second valve 1020 of the pneumatic ball valve are opened, so that the cooling water flows from the drain port of the chiller 400, through the second valve 1020, to the alkali heat exchanger 310, and finally through the first valve 1010 back to the inlet of the chiller 400, thus maintaining the cooling of the alkali.

[0122] S303. When the hydrogen storage in the first hydrogen storage tank 600 reaches the preset threshold, start the compressor 700 to compress the hydrogen.

[0123] When the hydrogen level in the first hydrogen storage tank 600 reaches a preset threshold, the controller 900 restarts the diaphragm compressor 700 to compress the hydrogen in the first hydrogen storage tank 600 and store it in the second hydrogen storage tank 800.

[0124] At the same time, the third valve 1030 is opened to cool the compressed high-temperature hydrogen gas, ensuring that the hydrogen gas is stored at a suitable temperature.

[0125] The technical effect provided in this embodiment is the same as that of a hydrogen production system, and will not be described again in this embodiment.

[0126] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A hydrogen production system, characterized in that, include: Electrolyzer, connecting pipes, separation skid, chiller, purification skid, first hydrogen storage tank, compressor, second hydrogen storage tank and controller; The discharge port of the electrolytic cell is connected to the feed port of the separation skid through the connecting pipe, the feed port of the electrolytic cell is connected to the discharge port of the separation skid through the connecting pipe, and a circulation pump is provided on the connecting pipe between the electrolytic cell and the separation skid. A temperature sensor is provided inside the electrolytic cell. The separation skid is equipped with an alkali heat exchanger, which has a heater. The drain port of the alkali heat exchanger is connected to the inlet of the chiller through the connecting pipe and is equipped with a first valve. The drain port of the chiller is connected to the inlet of the alkali heat exchanger through the connecting pipe. A delivery pump and a second valve are sequentially installed on the connecting pipe between the drain port of the chiller and the inlet of the alkali heat exchanger. The air inlet of the purification skid is connected to the exhaust port of the separation skid through the connecting pipe, and the exhaust port of the purification skid is connected to the air inlet of the first hydrogen storage tank through the connecting pipe. The pressure in the first hydrogen storage tank is lower than the pressure in the second hydrogen storage tank. The compressor's inlet is connected to the exhaust port of the first hydrogen storage tank via the connecting pipe. The compressor is equipped with a hydrogen heat exchanger, wherein the outlet of the hydrogen heat exchanger is connected to the inlet of the alkali heat exchanger and the inlet of the chiller via the connecting pipe. A third valve is provided on the connecting pipe between the outlet of the hydrogen heat exchanger and the inlet of the chiller. A branch pipe is provided on the connecting pipe between the outlet of the hydrogen heat exchanger and the inlet of the alkali heat exchanger, and a fourth valve is provided on the branch pipe. The inlet of the second hydrogen storage tank is connected to the outlet of the compressor; The controller is electrically connected to the electrolytic cell, separation skid, chiller, purification skid, compressor, first valve, second valve, third valve, fourth valve and delivery pump.

2. The system according to claim 1, characterized in that, The heater is activated when the temperature sensor detects that the temperature of the alkaline solution in the electrolytic cell reaches 45°C.

3. The system according to claim 2, characterized in that, The initial start-up condition for the electrolytic cell is that the temperature sensor detects that the temperature of the alkaline solution in the electrolytic cell reaches 75°C.

4. The system according to claim 3, characterized in that, The initial start-up condition for the chiller is that the temperature sensor detects that the temperature of the alkaline solution in the electrolytic cell reaches 75°C.

5. The system according to claim 1, characterized in that, The trigger condition for the simultaneous opening of the first valve and the second valve is that the temperature sensor detects that the temperature of the alkaline solution in the electrolytic cell reaches 75°C.

6. The system according to claim 1, characterized in that, The compressor is triggered to stop when the temperature sensor detects that the temperature of the alkaline solution in the electrolytic cell reaches 45°C.

7. The system according to claim 1, characterized in that, The opening trigger condition for the third valve is that the hydrogen content in the first hydrogen storage tank reaches a preset threshold.

8. The system according to claim 1, characterized in that, The first valve, the second valve, the third valve, and the fourth valve are all pneumatic ball valves.

9. The system according to claim 1, characterized in that, A pressure sensor is installed on the connecting pipe between the air inlet of the compressor and the exhaust port of the first hydrogen storage tank, and the pressure sensor is electrically connected to the controller.

10. The system according to any one of claims 1 to 9, characterized in that, The temperature sensor has an accuracy of ±0.1℃.

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