Drying equipment, hydrogen production system and hydrogen production station yard

Abstract

The utility model discloses drying equipment, a hydrogen production system and a hydrogen production station yard, and belongs to the technical field of water electrolysis hydrogen production. The drying equipment is applied to a hydrogen production system and is provided with a crude hydrogen inlet for introducing crude hydrogen to be dried, an emptying port communicated with the outside and a gas supply outlet for leading out a hydrogen product; the drying equipment comprises a regeneration gas branch and a plurality of drying devices, wherein the regeneration gas branch is used for introducing nitrogen or inert gas; the first ports of the plurality of drying devices are selectively communicated with the crude hydrogen inlet and the outlet of the regenerated gas branch, and the second ports of the plurality of drying devices are selectively communicated with the gas supply outlet and the vent nozzle. Nitrogen or inert gas is used as the regeneration gas, accidents caused by gas leakage can be avoided, the regeneration gas can be directly emptied, investment of equipment is reduced, and the drying equipment has no lower limit requirement for the crude hydrogen inlet amount, so that the drying efficiency is improved. The problems that a front-end power supply in the water electrolysis hydrogen production industry is unstable and the minimum load lower limit requirement that multiple sets of electrolytic cells are matched with a single set of drying equipment are solved.

Description

Technical Field

[0001] The present application belongs to the technical field of hydrogen production by electrolysis of water, and in particular relates to a drying device, a hydrogen production system and a hydrogen production station. Background Art

[0002] The electrolytic water hydrogen production purification process is to deeply deoxygenate and dry the crude hydrogen after gas-liquid separation to achieve the purpose of hydrogen purification. The deoxygenated high-temperature hydrogen is cooled by a cooler and separated from the condensed water before entering the drying tower. The hydrogen is deeply dried with an adsorbent in the drying tower. After the adsorbent is saturated, it needs to be hot-blown with gas to heat the adsorbent and take away the saturated water adsorbed in the adsorbent. After the hot regenerated gas leaves the drying tower, it is cooled and separated from the condensed water by a cooler, and then goes to the drying sub-tower for deep dehydration and then goes downstream after passing the test. In the related technology, hydrogen is usually used as the regeneration gas, and the minimum operating load to ensure the continuous operation of the device is 20% of the full load gas volume, which cannot meet the requirements of unstable front-end power supply and the minimum load limit of matching multiple electrolyzers with a single set of drying equipment in the electrolytic water hydrogen production industry. At the same time, there are many drying towers and control valves, the control loop is complex, and the device investment is high, so there is room for improvement. Utility Model Content

[0003] The present application aims to at least solve the problem of the minimum operating load in the related art. To this end, the present application proposes a drying device, a hydrogen production system and a hydrogen production station, which can solve the problem of unstable front-end power supply in the electrolysis water hydrogen production industry and the minimum load limit requirement for multiple electrolyzers to match a single drying device.

[0004] In a first aspect, the present application provides a drying device.

[0005] The drying device is applied to a hydrogen production system, and comprises a crude hydrogen inlet for introducing crude hydrogen to be dried, a venting port connected to the outside, and a gas supply outlet for exporting hydrogen products;

[0006] The drying equipment comprises: a regeneration gas branch and a plurality of drying devices.

[0007] The regeneration gas branch is used to introduce nitrogen or inert gas;

[0008] The first ports of the plurality of drying devices are selectively connected to the crude hydrogen inlet and the outlet of the regeneration gas branch, and the second ports of the plurality of drying devices are selectively connected to the gas supply outlet and the vent.

[0009] By using nitrogen or inert gas as the regeneration gas, fire or explosion caused by gas leakage and overheating can be avoided, and the regeneration gas can be discharged directly, reducing the investment in regeneration gas coolers, separators, drying towers, and control valves. The drying equipment has no lower limit requirement for the crude hydrogen intake volume, which solves the problem of unstable front-end power supply in the electrolysis water hydrogen production industry and the minimum load lower limit requirement for matching multiple electrolyzers with a single set of drying equipment.

[0010] According to one embodiment of the present application, the first port of each drying device is connected to the crude hydrogen inlet through a corresponding drying air intake control valve group.

[0011] The multiple drying devices can be operated continuously and used alternately. When one drying device is performing hydrogen-saturated water drying, another drying device can be regenerated to release adsorbed moisture. Moreover, through the flexible connection between the multiple drying devices, the regeneration gas branch, and the crude hydrogen inlet, the gas supply outlet, and the vent, the multiple drying devices can be operated continuously and used alternately, thereby ensuring the continuous supply of hydrogen and the recycling of the drying devices.

[0012] According to one embodiment of the present application, the dry intake control valve group includes a dry control valve and a hydrogen replacement control valve connected in parallel, and a flow cross-sectional area of ​​the hydrogen replacement control valve is smaller than a flow cross-sectional area of ​​the dry control valve.

[0013] The parallel design of the drying control valve and the hydrogen replacement control valve allows them to work independently without interfering with each other, thereby improving the flexibility and reliability of the system. The smaller flow cross-sectional area of ​​the hydrogen replacement control valve can protect the drying control valve and the adsorbent.

[0014] According to one embodiment of the present application, the second port of each drying device is connected to the vent port of the hydrogen production system through a corresponding regeneration gas outlet control valve, and a corresponding pressure-stabilizing valve is installed between each regeneration gas outlet control valve and the vent port of the hydrogen production system.

[0015] The pressure in the drying device is controlled by the pressure-stabilizing valve so that the pressure in the drying device is stabilized at a set value, which can improve the adsorbent regeneration efficiency. At the same time, the pressure-stabilizing valve can automatically adjust the gas pressure without manual intervention, thereby simplifying the operation and maintenance process of the system.

[0016] According to one embodiment of the present application, the regeneration gas branch is further installed with a regeneration gas heater, and the regeneration gas heater is configured to switch the working state based on the temperature of the drying device.

[0017] The configuration of switching the working state of the regeneration gas heater based on the temperature of the drying device can achieve precise control of the regeneration gas temperature and the temperature and pressure of the drying device, which helps to improve drying efficiency, reduce energy consumption, and extend the service life of the drying device.

[0018] According to one embodiment of the present application, the multiple drying devices include a first drying device and a second drying device, and the first drying device and the second drying device are configured such that when one of the drying devices is in a drying condition, the other drying device is sequentially in a regeneration gas hot blowing regeneration condition, a regeneration gas cold blowing regeneration condition and a hydrogen replacement condition.

[0019] Changing the switching of three drying devices to the switching of two drying devices can reduce the number of the drying devices and the control valves, eliminate the need to install a regeneration gas cooler and a regeneration gas separator, simplify the process control, and reduce the device investment.

[0020] According to an embodiment of the present application, each of the drying devices is provided with a temperature detection device and a pressure detection device.

[0021] By means of the temperature detection device and the pressure detection device, the temperature and pressure inside the drying device can be accurately controlled, thereby ensuring the safety, efficiency and stability of the drying process.

[0022] According to one embodiment of the present application, the drying device is applied to a hydrogen production system, and has a crude hydrogen inlet for introducing crude hydrogen to be dried, a vent connected to the outside, and a gas supply outlet for exporting hydrogen products; the drying device includes:

[0023] A regeneration gas branch, the regeneration gas branch is used to introduce nitrogen or inert gas and is provided with a regeneration gas heater;

[0024] a first drying device, wherein the first port of the first drying device is connected to the crude hydrogen inlet through a first drying control valve and a first hydrogen replacement control valve connected in parallel, the first port of the first drying device is connected to the outlet of the regeneration gas branch through a first regeneration inlet control valve, and the second port of the first drying device is connected to the gas supply outlet through a first drying outlet control valve; the second port of the first drying device is connected to the venting port through a first regeneration outlet control valve, and a first pressure-stabilizing valve is installed between the first regeneration outlet control valve and the venting port, and the flow cross-sectional area of ​​the first hydrogen replacement control valve is smaller than the flow cross-sectional area of ​​the first drying control valve;

[0025] A second drying device, wherein the first port of the second drying device is connected to the crude hydrogen inlet through a second drying control valve and a second hydrogen replacement control valve connected in parallel, the first port of the second drying device is connected to the outlet of the regeneration gas branch through a second regeneration air inlet control valve, and the second port of the second drying device is connected to the gas supply outlet through a second drying air outlet control valve; the second port of the second drying device is connected to the vent port through a second regeneration air outlet control valve, and a second pressure-stabilizing valve is installed between the second regeneration air outlet control valve and the vent port, and the flow cross-sectional area of ​​the first hydrogen replacement control valve is smaller than the flow cross-sectional area of ​​the first drying control valve.

[0026] In a second aspect, the present application provides a hydrogen production system, comprising:

[0027] Hydrogen production equipment;

[0028] a purification device, wherein an inlet of the purification device is connected to an outlet of the hydrogen production device;

[0029] As in any one of the above drying devices, the crude hydrogen inlet of the drying device is connected to the outlet of the purification device.

[0030] The connection mode of the crude hydrogen inlet of the drying equipment and the outlet of the purification device can ensure that the crude hydrogen is freed of impurities other than water through the purification device and can directly enter the drying equipment for drying treatment, thereby improving the efficiency and reliability of the entire hydrogen production system.

[0031] In a third aspect, the present application provides a hydrogen production station, comprising:

[0032] Hydrogen production system;

[0033] A green power generation system is used to supply power to the hydrogen production system.

[0034] Through the effective coordination of the various parts of the hydrogen production system, impurities in hydrogen can be effectively removed to improve its purity and quality. The green power generation system can provide clean and renewable electricity for the hydrogen production system, which helps promote the green development of the hydrogen energy industry and is beneficial to environmental protection and sustainable development.

[0035] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0037] Figure 1This is one of the process flow charts of the hydrogen production and purification process by electrolysis of water in the hydrogen production system provided in the embodiment of the present application;

[0038] Figure 2 This is the second process flow chart of the hydrogen production and purification process by electrolysis of water in the hydrogen production system provided in the embodiment of the present application.

[0039] Reference numerals:

[0040] A first drying device 1, a second drying device 2;

[0041] Regeneration gas branch A, regeneration gas heater 3;

[0042] A first temperature detection device 4, a second temperature detection device 5, a first pressure detection device 6, a second pressure detection device 7;

[0043] A first dry air intake control valve 8, a first hydrogen replacement control valve 9, a first regeneration air intake control valve 10, a second dry air intake control valve 11, a second hydrogen replacement control valve 12, a second regeneration air intake control valve 13, a first dry air outlet control valve 14, a first regeneration air outlet control valve 15, a second dry air outlet control valve 16, a second regeneration air outlet control valve 17, a first pressure stabilizing valve 18, and a second pressure stabilizing valve 19;

[0044] Regeneration gas heating temperature detection device 20, crude hydrogen inlet 21, venting port 22, gas supply outlet 23. DETAILED DESCRIPTION

[0045] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0046] The present application aims to at least solve the problem of the minimum operating load in the related art. To this end, the present application proposes a drying device, a hydrogen production system and a hydrogen production station, which can solve the problem of unstable front-end power supply in the electrolysis water hydrogen production industry and the minimum load limit requirement for multiple electrolyzers to match a single drying device.

[0047] Reference below Figure 1 and Figure 2 A drying device according to an embodiment of the present application is described.

[0048] like Figure 1 As shown, the drying equipment is applied to a hydrogen production system, and has a crude hydrogen inlet 21 for introducing crude hydrogen to be dried, a vent 22 connected to the outside, and a gas supply outlet 23 for exporting hydrogen products; the drying equipment includes: a regeneration gas branch A and multiple drying devices.

[0049] Regeneration gas branch A is used to introduce nitrogen or inert gas;

[0050] The first ports of the plurality of drying devices are selectively connected to the crude hydrogen inlet 21 and the outlet of the regeneration gas branch A, and the second ports of the plurality of drying devices are selectively connected to the gas supply outlet 23 and the venting port 22.

[0051] In this embodiment, the regeneration gas branch A is used to introduce nitrogen or inert gas.

[0052] The main function of the drying device is to remove moisture from hydrogen, ensure the dryness and purity of hydrogen, and prevent the moisture that may be contained in hydrogen from affecting the purity of hydrogen. The drying device can be an adsorption drying tower, and the adsorbent can be activated alumina, silica gel, activated carbon and molecular sieve, etc.

[0053] A drying tower usually consists of a tower body, a packing layer, inlet and outlet pipes and other parts. The tower body usually adopts a vertical structure, with a hydrogen inlet and outlet at the top and a water outlet at the bottom. It is made of stainless steel and other materials and has the characteristics of corrosion resistance, high temperature resistance, and reliable sealing. The packing layer is mainly filled with adsorbents to remove moisture from hydrogen. The inlet and outlet pipes are used to connect the hydrogen to be dried and the dry gas that has been heated, and are usually made of stainless steel.

[0054] The adsorbent may include multiple types, such as at least one of activated alumina, silica gel, activated carbon and molecular sieves. Taking the adsorbent including molecular sieves as an example, hydrogen enters the drying tower from the air inlet. When the hydrogen containing water passes through the packing layer equipped with molecular sieves, the water molecules will be adsorbed by the molecular sieve and fixed in the pores, while the dry hydrogen flows out through the packing layer. Molecular sieve is an inorganic crystalline material with a uniform microporous structure. Its pore size is comparable to the size of the adsorbed molecules. It can adsorb molecules with strong intermolecular forces, such as water and carbon dioxide, and allow molecules with weak intermolecular forces, such as air and hydrogen, to pass through.

[0055] As the drying device operates, the adsorbent gradually becomes saturated, that is, its adsorption capacity reaches its limit, and regeneration treatment is required to desorb the water molecules adsorbed on the adsorbent. Nitrogen or inert gas can be used as the regeneration gas, and no fire or explosion will occur due to gas leakage and overheating. The regeneration gas branch A is a circulation system for regenerating the drying device. Its function is to transport the regeneration gas to the drying device that has completed the adsorption to release and discharge the moisture adsorbed by the adsorbent.

[0056] In this embodiment, if Figure 1 As shown, the first ports of the plurality of drying devices are selectively connected to the crude hydrogen inlet 21 and the outlet of the regeneration gas branch A, and the second ports of the plurality of drying devices are selectively connected to the gas supply outlet 23 and the venting port 22.

[0057] The drying device includes two main interfaces: a first port and a second port. The first port of the drying device is connected to the crude hydrogen inlet 21 and the outlet of the regeneration gas branch A through a control valve, and the second port of the drying device is connected to the gas supply outlet 23 and the vent port 22 through a control valve. When the drying device performs hydrogen saturated water drying, the crude hydrogen enters the drying device from the first port through the control valve. After the adsorbent absorbs moisture, the dry hydrogen flows out from the second port of the drying device to obtain product hydrogen. When the drying device is regenerated, the regeneration gas enters the drying device from the first port through the control valve, and the water vapor in the adsorbent is discharged into the atmosphere through the vent port 22 to restore the adsorption capacity of the adsorbent.

[0058] It can be understood that multiple drying devices can be operated continuously and used alternately. When one drying device is drying hydrogen-saturated water, another drying device can be regenerated to release adsorbed moisture. Through flexible connection between multiple drying devices, regeneration gas branch A, and crude hydrogen inlet 21, gas supply outlet 23, and vent 22, continuous operation and alternating use of multiple drying devices can be achieved, ensuring continuous supply of hydrogen and recycling of the drying devices.

[0059] In the related art, there are also processes using nitrogen as regeneration gas, but they are mainly regeneration switching between hydrogen and nitrogen, that is, nitrogen and hydrogen are jointly regenerated. However, when the system is turned on, only the hydrogen regeneration drying device is used, and the nitrogen regeneration drying device is used after shutdown. In essence, when the system is shut down, the nature of nitrogen is not regeneration, but replacement, to prevent safety hazards caused by residual hydrogen in the drying tower. This is different from the technical solution of the present application that does not use hydrogen as regeneration gas, and there are problems such as too many equipment and complex control processes.

[0060] According to the hydrogen production system of the embodiment of the present application, nitrogen or inert gas is used as the regeneration gas. Nitrogen or inert gas has stable chemical properties and is not easy to react with hydrogen, which can avoid fire or explosion caused by leakage of regeneration gas or overheating. At the same time, nitrogen or inert gas itself does not contain moisture, which can prevent the introduction of new impurities during the regeneration process, thereby maintaining the purity of hydrogen, and can be directly vented, reducing the investment in regeneration gas coolers, separators, drying towers, and control valves, simplifying the control process, and the drying equipment has no lower limit requirement on the crude hydrogen intake volume, which solves the problems of unstable front-end power supply in the water electrolysis hydrogen production industry and the minimum load lower limit requirement for matching multiple electrolytic cells with a single drying equipment.

[0061] In some embodiments, Figure 2As shown, the first port of each drying device is connected to the crude hydrogen inlet 21 through the corresponding drying air inlet control valve group; the first port of each drying device is connected to the outlet of the regeneration gas branch A through the corresponding regeneration air inlet control valve; the second port of each drying device is connected to the gas supply outlet 23 through the corresponding drying air outlet control valve; the second port of each drying device is connected to the vent 22 of the hydrogen production system through the corresponding regeneration air outlet control valve.

[0062] During the actual working process, when the drying device is performing hydrogen saturated water drying, the crude hydrogen enters the drying device from the first port through the drying air inlet control valve group, and after the adsorbent absorbs the moisture, the dry hydrogen flows out from the second port of the drying device through the drying air outlet control valve group to obtain product hydrogen. When the drying device is regenerated, the regenerated gas enters the drying device from the first port through the regeneration air inlet control valve, and then the moisture in the adsorbent is discharged into the atmosphere through the vent port 22 through the regeneration air outlet control valve to restore the adsorption capacity of the adsorbent.

[0063] It can be understood that multiple drying devices can be operated continuously and used alternately. When one drying device is drying hydrogen-saturated water, another drying device can be regenerated to release adsorbed moisture. Moreover, through flexible connection between multiple drying devices, regeneration gas branch A, and crude hydrogen inlet 21, gas supply outlet 23, and vent 22, continuous operation and alternating use of multiple drying devices can be achieved to ensure continuous supply of hydrogen and recycling of drying devices.

[0064] In some embodiments, Figure 2 As shown, the dry air intake control valve group includes a dry air control valve and a hydrogen replacement control valve connected in parallel, and the flow cross-sectional area of ​​the hydrogen replacement control valve is smaller than the flow cross-sectional area of ​​the dry air control valve.

[0065] When the drying device is regenerated, the high-temperature regeneration gas is first blown hot to the drying device. After the regeneration is completed, the unheated normal-temperature regeneration gas continues to blow cold to the drying device. When the temperature of the drying device is reduced to the set temperature, the regeneration gas in the drying device is replaced by hydrogen and discharged.

[0066] The dry air intake control valve group includes a parallel dry control valve and a hydrogen replacement control valve, both of which can be used to control the flow of hydrogen entering the drying device. The dry control valve is mainly used to control the flow of dry gas and adopts a large-diameter switch valve, while the hydrogen replacement control valve is mainly used to control the flow of hydrogen filling when replacing hydrogen to ensure system safety and adopts a small-diameter switch valve.

[0067] By connecting the hydrogen replacement control valve in parallel with the drying control valve, the large-diameter drying control valve can be prevented from working frequently under high pressure difference, thereby protecting the drying control valve. The small-diameter hydrogen replacement control valve has a small gas flow rate, and the hydrogen flow rate required for pressurization is lower than the hydrogen flow rate required for drying. This can prevent the adsorbent in the drying device from being damaged by the impact of high-pressure difference and large-flow hydrogen on the adsorbent, and also reduce the impact on the hydrogen flow through the drying control valve.

[0068] It can be understood that the parallel design of the dry control valve and the hydrogen replacement control valve allows the two to work independently without interfering with each other, thereby improving the flexibility and reliability of the system. The smaller flow cross-sectional area of ​​the hydrogen replacement control valve can protect the dry control valve and the adsorbent.

[0069] In some embodiments, Figure 2 As shown, the second port of each drying device is connected to the vent port 22 of the hydrogen production system through a corresponding regeneration gas outlet control valve, and a corresponding pressure-stabilizing valve is installed between each regeneration gas outlet control valve and the vent port 22 of the hydrogen production system.

[0070] The regeneration gas outlet control valve is used to control the flow rate of the regeneration gas during the regeneration process, and the vent port 22 is used to release the regeneration gas to the external environment, which reduces the number of drying devices, regeneration gas coolers, regeneration gas separators, and control valves, simplifies the process flow, and reduces the investment in the device. It can also be used as a safety device to release pressure when the system needs to reduce pressure or discharge gas.

[0071] The pressure stabilizing valve, also known as the pressure regulating valve, is installed between the regeneration gas outlet control valve and the vent 22. It is used to adjust and control the pressure of the gas passing through. The pressure stabilizing time is usually controlled for 5 minutes to 30 minutes. Its main function is to reduce the upstream high-pressure gas to the stable pressure range required by the downstream, ensuring that the pressure in the system will not be too high, thereby protecting the system from damage or danger.

[0072] It can be understood that by controlling the pressure in the drying device through a pressure-stabilizing valve and stabilizing the pressure in the drying device at a set value, the regeneration efficiency of the drying device can be improved. At the same time, the pressure-stabilizing valve can automatically adjust the gas pressure without manual intervention, thereby simplifying the operation and maintenance process of the system.

[0073] In some embodiments, Figure 2 As shown, the regeneration gas branch A is also equipped with a regeneration gas heater 3, and the regeneration gas heater 3 is configured to switch the working state based on the temperature of the drying device.

[0074] In the hydrogen production system, the regeneration gas heater 3 installed on the regeneration gas branch A is mainly used to heat the regeneration gas to ensure that the regeneration gas reaches an appropriate temperature when entering the drying device. The hydrogen is deeply dried by the adsorbent in the drying device. After the adsorbent is saturated with water, the regeneration gas is required to heat the adsorbent and take away the saturated water adsorbed in the adsorbent. The hot-blown regeneration gas generally needs to be heated to a set temperature, such as 180°C-220°C. The adsorbent requires a high temperature, such as a temperature above 180°C, to be fully regenerated.

[0075] The regeneration gas heater 3 will automatically adjust its working state according to the actual temperature of the drying device, that is, switch between hot-blow regeneration work, cold-blow regeneration work and hydrogen replacement work.

[0076] When the drying device starts to regenerate, the pressure in the drying device is first controlled to be slightly lower than the pressure of the regeneration gas, and a pressure stabilization time is set, such as about 10 minutes, so that the regeneration gas can smoothly enter the drying device due to the pressure difference. When the pressure value and the pressure stabilization time of the drying device meet the set values ​​at the same time, the regeneration gas heater 3 is turned on to heat the regeneration gas flowing through the regeneration gas branch A. When the high-temperature regeneration gas enters the drying device for regeneration, the temperature of the drying device can be increased, thereby improving the drying efficiency. At this time, it is a hot-blow regeneration working state. When the temperature of the drying device reaches a predetermined upper limit, such as 180°C and above, the regeneration of the drying device is completed, and the regeneration gas is turned off. Heater 3, at this time, when the regenerated gas enters the drying device, the temperature of the drying device will be lowered, which is a cold blowing regeneration working state, which can prevent the drying device from being damaged due to overheating and ensure the stable operation of the system. When the temperature of the drying device reaches the set cold blowing end temperature, such as about 40°C, the cold blowing regeneration ends, and the pressure is stabilized for a period of time, such as about 5 minutes, and then hydrogen is used to replace the regenerated gas in the drying device. The replacement time is set, such as about 5 minutes, and finally the pressure is slowly increased. When the second pressure detection device 7 reaches the normal operating pressure of the crude hydrogen, the second pressure detection device 7 closes the second hydrogen replacement control valve (12), and the second drying device 2 is pressurized.

[0077] It can be understood that the configuration of switching the working state of the regeneration gas heater 3 based on the temperature of the drying device can achieve precise control of the regeneration gas temperature and the temperature and pressure of the drying device, which helps to improve the drying efficiency, reduce energy consumption, and extend the service life of the drying device.

[0078] In this embodiment, if Figure 2 As shown, the multiple drying devices include a first drying device 1 and a second drying device 2. The first drying device 1 and the second drying device 2 are configured so that when one of the drying devices is in a drying condition, the other drying device is sequentially in a regeneration gas hot blowing regeneration condition, a regeneration gas cold blowing regeneration condition and a hydrogen replacement condition.

[0079] Adsorbents may include multiple types, such as at least one of activated alumina, silica gel, activated carbon and molecular sieves. In a drying device using molecular sieves as adsorbents, when hydrogen containing water passes through a packing layer containing molecular sieves, water molecules will be adsorbed by the molecular sieves and fixed in the pores, while dry hydrogen will flow out through the packing layer. Molecular sieves are an inorganic crystalline material with a uniform microporous structure. The pore size is comparable to the size of the adsorbed molecules. They can adsorb molecules with strong intermolecular forces, such as water and carbon dioxide, and allow molecules with weak intermolecular forces, such as air and hydrogen, to pass through.

[0080] As the drying device operates, the adsorbent gradually becomes saturated, that is, its adsorption capacity reaches its limit, and regeneration treatment is required to desorb the water molecules adsorbed on the adsorbent. The regeneration treatment includes two stages: hot blowing of regeneration gas and cold blowing of regeneration gas. The hot blowing of regeneration gas can increase the temperature of the adsorbent, weaken its internal adsorption force, thereby releasing the water molecules and restoring the adsorption capacity of the adsorbent. Then, cold blowing of regeneration gas is performed to lower the temperature of the drying device. After the regeneration treatment is completed, hydrogen replacement is also required. Hydrogen is used to replace the regeneration gas in the drying device, and the regeneration gas in the drying device is emptied to fill it with hydrogen.

[0081] In the related art, in order to ensure the drying effect, the regenerated gas is generally taken from behind the drying device, and three drying devices are used. When working, the first drying device dries the crude hydrogen, the second drying device heats and regenerates the adsorbent saturated with adsorption, and the third drying device dries the regenerated gas. However, this process has a large number of drying devices, many control valves, complex control loops, high device investment, and room for improvement.

[0082] In the technical solution of the present application, two drying devices are used alternately during the regeneration process. When one drying device is regenerating, the other drying device can continue to perform adsorption work to ensure a continuous supply of hydrogen.

[0083] It is understandable that by changing the switching of three drying devices to the switching of two drying devices, the number of drying devices and control valves can be reduced, and there is no need to install a regeneration gas cooler and a regeneration gas separator, which simplifies process control and reduces device investment.

[0084] In some embodiments, Figure 2 As shown, each drying device is provided with a temperature detection device and a pressure detection device.

[0085] The temperature detection device is used to monitor the temperature inside the drying device in real time to ensure that the drying and regeneration processes are carried out within the set temperature range to prevent overheating from causing equipment damage or overcooling from causing low drying efficiency. The first temperature detection device 4 is used to detect the temperature of the first drying device 1, and the second temperature detection device 5 is used to detect the temperature of the second drying device 2.

[0086] The pressure detection device is used to monitor the pressure changes inside the drying device, wherein the first pressure detection device 6 is used to detect the pressure of the first drying device 1, and the second pressure detection device 7 is used to detect the pressure of the second drying device 2. By real-time monitoring of the pressure changes during the drying process, the control process can be adjusted in time to ensure that the drying process is carried out smoothly and efficiently. At the same time, the pressure detection device can also promptly discover potential safety hazards, such as the risk of explosion caused by excessive internal pressure of the equipment.

[0087] It can be understood that, through the temperature detection device and the pressure detection device, the temperature and pressure inside the drying device can be accurately controlled, thereby ensuring the safety, efficiency and stability of the drying process.

[0088] In some embodiments, Figure 2 As shown, the drying device is applied to a hydrogen production system, and the drying device has a crude hydrogen inlet 21 for introducing crude hydrogen to be dried, a vent 22 connected to the outside, and a gas supply outlet 23 for exporting hydrogen products;

[0089] The drying equipment comprises: a regeneration gas branch A, a first drying device 1 and a second drying device 2. The regeneration gas branch A is used to introduce nitrogen or inert gas and is provided with a regeneration gas heater 3.

[0090] The first port of the first drying device 1 is connected to the crude hydrogen inlet 21 through the first drying control valve 8 and the first hydrogen replacement control valve 9 connected in parallel, the first port of the first drying device 1 is connected to the outlet of the regeneration gas branch A through the first regeneration air inlet control valve 10, and the second port of the first drying device 1 is connected to the gas supply outlet 23 through the first drying outlet control valve 14; the second port of the first drying device 1 is connected to the vent 22 through the first regeneration outlet control valve 15, and a first pressure stabilizing valve 18 is installed between the first regeneration outlet control valve 15 and the vent 22, and the flow cross-sectional area of ​​the first hydrogen replacement control valve 9 is smaller than the flow cross-sectional area of ​​the first drying control valve 8;

[0091] The first port of the second drying device 2 is connected to the crude hydrogen inlet 21 through the second drying control valve 11 and the second hydrogen replacement control valve 12 in parallel, the first port of the second drying device 2 is connected to the outlet of the regeneration gas branch A through the second regeneration air inlet control valve 13, and the second port of the second drying device 2 is connected to the gas supply outlet 23 through the second drying air outlet control valve 16; the second port of the second drying device 2 is connected to the vent 22 through the second regeneration air outlet control valve 17, and a second pressure stabilizing valve 19 is installed between the second regeneration air outlet control valve 17 and the vent 22, and the flow cross-sectional area of ​​the first hydrogen replacement control valve 12 is smaller than the flow cross-sectional area of ​​the first drying control valve 11.

[0092] The drying equipment has a crude hydrogen inlet 21 for introducing crude hydrogen to be dried, a vent 22 connected to the outside, and a gas supply outlet 23 for exporting hydrogen products. The crude hydrogen to be dried enters the drying equipment from the crude hydrogen inlet 21, the regenerated gas enters the external environment through the vent 22, and the product hydrogen enters the storage device from the gas supply outlet 23.

[0093] The drying equipment mainly includes a regeneration gas branch A, a first drying device 1 and a second drying device 2. The regeneration gas branch A is used to introduce nitrogen or inert gas as regeneration gas, and is provided with a regeneration gas heater 3. The regeneration gas heater 3 is mainly used to heat the regeneration gas to ensure that the regeneration gas reaches an appropriate temperature when entering the drying device, and switches between hot blowing regeneration work, cold blowing regeneration work and hydrogen replacement work according to the actual temperature of the drying device. The first drying device 1 and the second drying device 2 are used alternately. When one drying device is regenerating, the other drying device can continue to perform drying work to ensure a continuous supply of hydrogen.

[0094] When the first drying device 1 is performing hydrogen saturated water drying, crude hydrogen enters the first drying device 1 through the first drying control valve 8, and after drying, passes through the first drying gas outlet control valve 14 to the gas supply outlet 23 to become product hydrogen. When the first drying device 1 is regenerated, the pressure in the first drying device 1 is stabilized at a pressure slightly lower than the pressure of the regenerated gas through the first pressure stabilizing valve 18. When the pressure value and the pressure stabilizing time of the first drying device 1 meet the set values ​​at the same time, the regenerated gas heated to the set temperature by the regeneration gas heater 3 enters the first drying device 1 through the first regeneration gas inlet control valve 10 for hot blowing regeneration. After reaching the set temperature, the regeneration gas heater 33 is turned off, and the unheated room temperature regeneration gas continues to perform cold blowing regeneration on the first drying device 1. After reaching the set cold blowing end temperature, the pressure is stabilized for a period of time, and then hydrogen is used to replace the regeneration gas in the first drying device 1 through the first hydrogen replacement control valve 9, and the flow cross-sectional area of ​​the first hydrogen replacement control valve 9 is smaller than the flow cross-sectional area of ​​the first drying control valve 8, so as to avoid the damage of the adsorbent in the drying device due to the impact of high pressure difference and large flow hydrogen on the adsorbent, and at the same time, the influence on the hydrogen flow through the drying control valve can be reduced.

[0095] When the second drying device 2 is performing hydrogen saturated water drying, crude hydrogen enters the second drying device 2 through the second drying control valve 11, and after drying, passes through the second drying gas outlet control valve 16 to the gas supply outlet 23 to become product hydrogen. When the second drying device 2 is regenerating, the pressure in the second drying device 2 is stabilized at a pressure slightly lower than the pressure of the regenerated gas through the second pressure stabilizing valve 19. When the pressure value and the pressure stabilizing time of the second drying device 2 both meet the set values, the regenerated gas heated to the set temperature by the regeneration gas heater 3 enters the second drying device 2 through the second regeneration gas inlet control valve 13 to perform hot blowing regeneration. After reaching the set temperature, the regeneration gas heater 33 is turned off, and the unheated room temperature regeneration gas continues to perform cold blowing regeneration on the second drying device 2. After reaching the set cold blowing end temperature, the pressure is stabilized for a period of time, and then hydrogen is used to replace the regeneration gas in the second drying device 2 through the second hydrogen replacement control valve 12, and the flow cross-sectional area of ​​the second hydrogen replacement control valve 12 is smaller than the flow cross-sectional area of ​​the second drying control valve 11, so as to avoid the damage to the adsorbent in the drying device caused by the impact of high pressure difference and large flow rate hydrogen on the adsorbent, and at the same time, the influence on the hydrogen flow through the drying control valve can be reduced.

[0096] An embodiment of the present application is described in detail below.

[0097] When the first drying device 1 is performing hydrogen saturated water adsorption drying, the second drying device 2 is performing regeneration, the first drying air intake control valve 8, the first drying air outlet control valve 14, and the second regeneration air outlet control valve 17 are opened, the first hydrogen replacement control valve 9, the first regeneration air intake control valve 10, the second drying air intake control valve 11, the second hydrogen replacement control valve 12, the second regeneration air intake control valve 13, the first regeneration air outlet control valve 15, and the second drying air outlet control valve 16 are in a closed state, and the saturated water-containing crude hydrogen is subjected to hydrogen saturated water adsorption drying in the first drying device 1, the second pressure stabilizing valve 19 is interlocked with the second pressure detection device 7 to control the pressure in the second drying device 2 to be slightly less than the pressure value of the regeneration gas, and a pressure stabilizing time of 10 minutes is set, when the pressure value and the pressure stabilizing time of the second drying device 2 simultaneously meet the set values, the regeneration gas heater 3 and the second regeneration air intake control valve 13 are opened, the regeneration gas heater 3 is interlocked with the regeneration gas heating temperature detection device 20 to control the temperature of the hot-blown regeneration gas to be 220°C, and the second pressure stabilizing valve 19 is interlocked with the second pressure detection device 7 to control the pressure in the second drying device 2 so that the pressure in the tower is stabilized at the set value. When the detection temperature of the temperature transmitter 5 reaches the set temperature of 180°C, the temperature transmitter 5 interlocks the regeneration gas heater 3 to close, and the regeneration of the second drying device 2 is completed. The unheated normal temperature regeneration gas continues to cold blow the second drying device 2. When the detection temperature of the second temperature detection device 5 reaches the set cold blowing end temperature of 40°C, the second temperature detection device 5 interlocks to close the second regeneration air intake control valve 13. After 5 minutes, the second hydrogen replacement control valve 12 is opened. The second pressure stabilizing valve 19 is interlocked with the second pressure detection device 7 to control the pressure in the drying tower so that the pressure in the tower is stabilized. Hydrogen replaces the regeneration gas in the second drying device 2. The replacement time is set to 5 minutes. After the set time is reached, the second regeneration outlet control valve 17 is closed, and the second drying device 2 starts to slowly increase the pressure. When the second pressure detection device 7 reaches the normal operating pressure of the crude hydrogen, the second pressure detection device 7 closes the second hydrogen replacement control valve 12, and the pressurization of the second drying device 2 is completed.

[0098] When the second drying device 2 is performing hydrogen saturated water adsorption drying, the first drying device 1 is performing regeneration, the second drying air intake control valve 11, the first regeneration air outlet control valve 15, and the second drying air outlet control valve 16 are opened, the first drying air intake control valve 8, the first hydrogen replacement control valve 9, the first regeneration air intake control valve 10, the second hydrogen replacement control valve 12, the second regeneration air intake control valve 13, the first drying air outlet control valve 14, and the second regeneration air outlet control valve 17 are in a closed state, and the saturated water-containing crude hydrogen is subjected to hydrogen saturated water adsorption drying in the second drying device 2, the first pressure stabilizing valve 18 is interlocked with the first pressure detection device 6 to control the internal pressure to a pressure value slightly lower than that of the regeneration gas, and a pressure stabilizing time of 10 minutes is set, when the pressure value and the pressure stabilizing time of the first drying device 1 simultaneously meet the set values, the regeneration gas heater 3 and the first regeneration air intake control valve 10 are opened, the regeneration gas heater 3 is interlocked with the regeneration gas heating temperature detection device 20 to control the temperature of the hot-blown regeneration gas to 220°C, and the first pressure stabilizing valve 18 is interlocked with the first pressure detection device 6 to control the internal pressure to a pressure value slightly lower than that of the regeneration gas, and a pressure stabilizing time of 10 minutes is set, when the pressure value and the pressure stabilizing time of the first drying device 1 simultaneously meet the set values, the regeneration gas heater 3 and the first regeneration air intake control valve 10 are opened, and the regeneration gas heater 3 is interlocked with the regeneration gas heating temperature detection device 20 to control the temperature of the hot-blown regeneration gas to 220°C, and the first pressure stabilizing valve 18 is interlocked with the first pressure detection device 6 to control the internal pressure to a Valve 18 is interlocked with the first pressure detection device 6 to control the internal pressure so that the pressure in the tower is stabilized at the set value. After the detection temperature of the first temperature detection device 4 reaches the set temperature of 180°C, the first temperature detection device 4 is interlocked to close the regeneration gas heater 3, and the regeneration of the first drying device 1 is completed. The unheated normal temperature regeneration gas continues to cold blow the first drying device 1. When the detection temperature of the first temperature detection device 4 reaches the set cold blowing end temperature of 40°C, the first temperature detection device 4 is interlocked to close the first regeneration air intake control valve 10. After 5 minutes, the first hydrogen replacement control valve 9 is opened, and the first pressure stabilizing valve 18 is interlocked with the first pressure detection device 6 to control the pressure to stabilize the pressure in the tower. Hydrogen replaces the regeneration gas in the first drying device 1. The replacement time is set to 5 minutes. After the set time is reached, the first regeneration outlet control valve 15 is closed, and the first drying device 1 starts to slowly increase the pressure. When the first pressure detection device 6 reaches the normal operating pressure of crude hydrogen, the first pressure detection device 6 is interlocked to close the first hydrogen replacement control valve 9, and the pressurization of the first drying device 1 is completed.

[0099] Among them, during normal operation, the first temperature detection device 4, the second temperature detection device 5, the first pressure detection device 6, the second pressure detection device 7, the regeneration gas heating temperature detection device 20, the first pressure regulating valve 18, and the second pressure regulating valve 19 do not switch the open and closed states and are always set to the open state.

[0100] It is understandable that by using nitrogen or inert gas as the regeneration gas, fire or explosion caused by gas leakage and overheating can be avoided, and the regeneration gas can be discharged directly, reducing the investment in regeneration gas coolers, separators, drying towers, and control valves. The drying equipment has no lower limit requirement for the crude hydrogen intake volume, which can solve the problem of unstable front-end power supply in the electrolysis of water hydrogen production industry and the minimum load lower limit requirement for matching multiple electrolytic cells with a single set of drying equipment.

[0101] An embodiment of the present application also provides a hydrogen production system, which includes: a hydrogen production device, a purification device and a drying device.

[0102] The inlet of the purification device is connected to the outlet of the hydrogen production device, and the crude hydrogen inlet 21 of the drying device is connected to the outlet of the purification device.

[0103] The hydrogen production device may include an electrolyzer and a gas-liquid separator, which are responsible for electrolyzing water to produce hydrogen, and obtaining crude hydrogen containing oxygen and saturated with water after gas-liquid separation. The purification device may include a hydrogen heater, a deoxidizer, a cooler and a condensed water separator connected in sequence. The inlet of the purification device is connected to the outlet of the hydrogen production device, and the crude hydrogen containing oxygen and saturated with water enters the purification device through the outlet of the hydrogen production device. The crude hydrogen inlet 21 of the drying device is connected to the outlet of the purification device, and the crude hydrogen processed by each processing unit of the purification device enters the drying device. The drying device includes a regeneration gas branch A, a first drying device 1 and a second drying device 2. The regeneration gas branch A is a circulation system for regenerating the drying device, and nitrogen or inert gas can be introduced. Its function is to transport the regeneration gas to the drying device that completes the adsorption to release and discharge the moisture adsorbed by the adsorbent.

[0104] The main function of the drying device is to remove moisture from hydrogen, ensure the dryness and purity of hydrogen, and prevent the moisture that may be contained in hydrogen from affecting the purity of hydrogen. The first drying device 1 and the second drying device 2 can be operated continuously and used alternately. When one drying device is drying hydrogen saturated water, the other drying device can be regenerated to release the adsorbed moisture, thereby ensuring the continuous supply of hydrogen and the recycling of the drying devices.

[0105] It can be understood that when the adsorbent in the drying device is saturated, the regeneration gas can be used to remove the adsorbed moisture and restore the adsorption capacity of the adsorbent. During the regeneration process, the pressure of the drying device is stabilized at a pressure slightly lower than the pressure of the regeneration gas, which can ensure that the regeneration process can proceed smoothly. The connection method of the crude hydrogen inlet 21 and the outlet of the purification device can ensure that the crude hydrogen is removed of other impurities except water through the purification device, and can directly enter the drying equipment for drying treatment, thereby improving the efficiency and reliability of the entire hydrogen production system.

[0106] An embodiment of the present application also provides a hydrogen production station, which includes: a hydrogen production system and a green power generation system.

[0107] Green power generation systems can be used to power hydrogen production systems.

[0108] The hydrogen production system may include: a hydrogen production device, a purification device and a drying device, wherein the hydrogen production device includes an electrolyzer and a gas-liquid separator, which are responsible for electrolyzing water to produce hydrogen, the purification device includes a hydrogen heater, a deoxidizer, a cooler and a condensed water separator connected in sequence, and the drying equipment includes a regeneration gas branch A, a first drying device 1 and a second drying device 2, the regeneration gas branch A is a circulation system for regenerating the drying device, and the regeneration gas heater is installed on the regeneration gas branch A.

[0109] Green power generation systems, such as photovoltaic power generation systems, wind power generation systems or hydropower generation systems, are a green hydrogen production source based on clean energy. Photovoltaic power generation systems can directly convert light energy into electrical energy by utilizing the photoelectric effect of semiconductors, and then power the electrolysis device to drive the electrolysis process to produce hydrogen. Wind power generation systems can directly convert wind energy into electrical energy. Although it is unstable, it can also provide a continuous power supply for the hydrogen production system. Hydropower generation systems can use the energy generated by water flow or water level difference to generate electricity to power the hydrogen production system.

[0110] It is understandable that through the effective coordination of hydrogen production equipment, purification equipment and drying equipment, impurities in hydrogen can be effectively removed, its purity and quality can be improved, and a strong guarantee can be provided for the stable operation of the hydrogen production system. The green power generation system can provide clean and renewable electricity for the hydrogen production system, which will help promote the green development of the hydrogen energy industry and benefit environmental protection and sustainable development.

[0111] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0112] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0113] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0114] In the description of the present application, “plurality” means two or more.

[0115] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0116] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0117] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0118] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A drying device, characterized in that: Applied to a hydrogen production system, the drying device has a crude hydrogen inlet for introducing crude hydrogen to be dried, a vent connected to the outside, and a gas supply outlet for exporting hydrogen products; the drying device includes: A regeneration gas branch, wherein the regeneration gas branch is used to introduce nitrogen or an inert gas; A plurality of drying devices, each of which has a first port selectively connected to the crude hydrogen inlet and the outlet of the regeneration gas branch, and each of which has a second port selectively connected to the gas supply outlet and the vent.

2. The drying device according to claim 1, characterized in that: The first port of each drying device is connected to the crude hydrogen inlet through a corresponding drying air intake control valve group.

3. The drying device according to claim 2, characterized in that: The dry air intake control valve group includes a dry control valve and a hydrogen replacement control valve connected in parallel, and a flow cross-sectional area of ​​the hydrogen replacement control valve is smaller than a flow cross-sectional area of ​​the dry control valve.

4. The drying device according to claim 2, characterized in that: The second port of each drying device is connected to the vent of the hydrogen production system through a corresponding regeneration gas outlet control valve, and a corresponding pressure-stabilizing valve is installed between each regeneration gas outlet control valve and the vent of the hydrogen production system.

5. The drying device according to any one of claims 1 to 4, characterized in that: The regeneration gas branch is also equipped with a regeneration gas heater, and the regeneration gas heater is configured to switch the working state based on the temperature of the drying device.

6. The drying device according to any one of claims 1 to 4, characterized in that: The multiple drying devices include a first drying device and a second drying device, and the first drying device and the second drying device are configured such that when one of the drying devices is in a drying condition, the other drying device is sequentially in a regeneration gas hot blowing regeneration condition, a regeneration gas cold blowing regeneration condition and a hydrogen replacement condition.

7. The drying device according to any one of claims 1 to 4, characterized in that: Each of the drying devices is provided with a temperature detection device and a pressure detection device.

8. A drying device, characterized in that: Applied to a hydrogen production system, the drying device has a crude hydrogen inlet for introducing crude hydrogen to be dried, a vent connected to the outside, and a gas supply outlet for exporting hydrogen products; the drying device includes: A regeneration gas branch, the regeneration gas branch is used to introduce nitrogen or inert gas and is provided with a regeneration gas heater; a first drying device, wherein the first port of the first drying device is connected to the crude hydrogen inlet through a first drying control valve and a first hydrogen replacement control valve connected in parallel, the first port of the first drying device is connected to the outlet of the regeneration gas branch through a first regeneration inlet control valve, and the second port of the first drying device is connected to the gas supply outlet through a first drying outlet control valve; the second port of the first drying device is connected to the venting port through a first regeneration outlet control valve, and a first pressure-stabilizing valve is installed between the first regeneration outlet control valve and the venting port, and the flow cross-sectional area of ​​the first hydrogen replacement control valve is smaller than the flow cross-sectional area of ​​the first drying control valve; A second drying device, wherein the first port of the second drying device is connected to the crude hydrogen inlet through a second drying control valve and a second hydrogen replacement control valve connected in parallel, the first port of the second drying device is connected to the outlet of the regeneration gas branch through a second regeneration air inlet control valve, and the second port of the second drying device is connected to the gas supply outlet through a second drying air outlet control valve; the second port of the second drying device is connected to the vent port through a second regeneration air outlet control valve, and a second pressure-stabilizing valve is installed between the second regeneration air outlet control valve and the vent port, and the flow cross-sectional area of ​​the first hydrogen replacement control valve is smaller than the flow cross-sectional area of ​​the first drying control valve.

9. A hydrogen production system, characterized in that: include: Hydrogen production equipment; a purification device, wherein an inlet of the purification device is connected to an outlet of the hydrogen production device; The drying device according to any one of claims 1 to 7 or 8, wherein the crude hydrogen inlet of the drying device is connected to the outlet of the purification device.

10. A hydrogen production station, characterized in that: include: The hydrogen production system according to claim 9; A green power generation system is used to supply power to the hydrogen production system.

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