Hydrogen impurity removal method for hydrogen card

Abstract

The invention relates to the technical field of hydrogen preparation, in particular to a hydrogen impurity removal method for a hydrogen card, which comprises the following steps: S1, hydrogen deoxidation: crude hydrogen separated by a gas-water separator is conveyed to a hydrogen purification section by using a gas conveying pipeline, and passes through a first hydrogen-water separator, a deoxidation tower and a deoxidation cooler shell pass in sequence; discharging water, deoxidizing and cooling step by step, and then entering a second hydrogen-water separator to remove moisture generated in the deoxidizing tower; and S2, hydrogen three-tower drying is conducted, specifically, hydrogen output by the second hydrogen-water separator enters one of the tower group A, the tower group B and the tower group C in the running state, specifically, the hydrogen sequentially passes through a third hydrogen-water separator, a hydrogen regeneration cooler and a hydrogen drying tower, the hydrogen is adsorbed, and pure hydrogen is prepared. In the hydrogen preparation process, the corresponding operation state is adjusted according to the temperature and purity of the hydrogen, the power consumption during hydrogen preparation can be effectively reduced, and then the environment-friendly and energy-saving effects are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production, and specifically to a method for purifying hydrogen for a hydrogen truck. Background Art

[0002] The principle of a hydrogen truck is mainly based on two technologies: hydrogen fuel cells and hydrogen internal combustion engines. The core principle of a hydrogen fuel cell truck is to convert hydrogen and oxygen into electrical energy through an electrochemical reaction, and the only by-product generated is water vapor, thus achieving zero emissions. As a clean energy source, hydrogen produces electrical energy or heat through an electrochemical reaction or combustion, with almost no pollutant emissions, making it particularly suitable for reducing greenhouse gas emissions and improving air quality. The zero-emission characteristics of hydrogen fuel cell trucks give them an advantage in future emission standard upgrades, while hydrogen internal combustion engine trucks are applicable to more scenarios due to their mature technology and lower costs.

[0003] When existing equipment prepares hydrogen for a hydrogen truck, it cannot perform corresponding treatments according to the temperature and purity of hydrogen, resulting in high energy consumption during the hydrogen production process, which is not conducive to environmental protection and energy conservation. Therefore, it does not meet the existing requirements, and for this reason, we propose a method for purifying hydrogen for a hydrogen truck. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for purifying hydrogen for a hydrogen truck to solve the problem raised in the above background art that when existing equipment prepares hydrogen for a hydrogen truck, it cannot perform corresponding treatments according to the temperature and purity of hydrogen, resulting in high energy consumption during the hydrogen production process, which is not conducive to environmental protection and energy conservation.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A method for purifying hydrogen for a hydrogen truck, including the following steps:

[0006] S1: Hydrogen deoxidation. The crude hydrogen separated by the gas-water separator is transported to the hydrogen purification section through a gas pipeline, and successively passes through the first hydrogen-water separator, the deoxidation tower, and the shell side of the deoxidation cooler to gradually remove water, deoxidize, and cool down, and then enters the second hydrogen-water separator to remove the water generated in the deoxidation tower.

[0007] S2: Three-tower drying of hydrogen. The hydrogen output from the second hydrogen-water separator enters one of the operating tower groups of Group A tower, Group B tower, and Group C tower. Specifically, it successively passes through the third hydrogen-water separator, the hydrogen regeneration cooler, and the hydrogen drying tower to adsorb hydrogen and produce pure hydrogen, and then the pure hydrogen is transported to the hydrogen filter for filtration, and finally is detected by a trace oxygen analyzer and a dew point meter and stored in a hydrogen storage tank.

[0008] S3: Hydrogen pressurization and transfer. Hydrogen is transported through a gas pipeline to a hydrogen buffer tank, continuously compressed in a first hydrogen compressor, then transported to two hydrogen filling columns. The hydrogen filling columns are used to fill the tube trailers with hydrogen, and the hydrogen-filled tube trailers are transported to the hydrogen refueling station area. Meanwhile, high-pressure nitrogen in the nitrogen cylinder container is depressurized through a pressure reducing valve and used to purge and displace the hydrogen unloading column. The tube trailer unloads the hydrogen in the hydrogen unloading column through a unloading hose, and the hydrogen is compressed by a second hydrogen compressor and transported to a hydrogen storage cylinder bank.

[0009] S4: Direct hydrogen pressurization. Hydrogen is transported through a gas pipeline to a hydrogen buffer tank, continuously compressed in a third hydrogen compressor, and then transported to a hydrogen storage cylinder bank.

[0010] S5: Hydrogen filling. The hydrogen compressed by the hydrogen compressor is input into the hydrogen storage cylinder bank for storage. The hydrogen coming out from either the hydrogen compressor or the hydrogen storage cylinder bank is transported to the hydrogen refueling system through a gas pipeline, enabling the hydrogen dispenser to fill the hydrogen into the hydrogen fuel cell through a high-pressure hydrogen pipeline.

[0011] Preferably, the hydrogen purification section consists of hydrogen deoxidation and three-column hydrogen drying. The working pressure of the gas pipeline in the hydrogen purification section is 3 Mpa. The first hydrogen-water separator is used to preliminarily remove the condensed water in hydrogen. A catalyst is provided in the deoxidation tower. The deoxidation tower uses the catalyst to react the impurity oxygen in hydrogen with hydrogen to generate water and remove the oxygen-containing components in hydrogen. The shell side of the cooler is connected to a cooling tower through a coolant circulation pump. The shell side of the cooler is used to exchange heat between hydrogen and the circulating coolant in the cooling tower. The coolant circulation pump is used to boost the pressure of the circulating coolant in the cooling tower and transport it to the inside of the tube side of the deoxidation cooler.

[0012] Preferably, the three-column hydrogen drying consists of Group A tower, Group B tower, and Group C tower. Pneumatic ball valves are provided between the second hydrogen-water separator and Group A tower, Group B tower, and Group C tower. The three states of Group A tower, Group B tower, and Group C tower are controlled by the opening and closing of the three pneumatic ball valves. The three states of Group A tower, Group B tower, and Group C tower are respectively:

[0013] Group A tower is working, Group B tower is being regenerated, and Group C tower is working for the second time;

[0014] Group A tower is working for the second time, Group B tower is working, and Group C tower is being regenerated;

[0015] Group A tower is being regenerated, Group B tower is working for the second time, and Group C tower is working;

[0016] Group A tower, Group B tower, and Group C tower periodically complete drying, regeneration, and dehydration work.

[0017] Preferably, each of the Group A tower, Group B tower, and Group C tower consists of a third hydrogen water separator, a hydrogen regeneration cooler, and a hydrogen drying tower. Inside the hydrogen drying tower, a molecular sieve is fixedly installed, and an adsorbent is filled inside the molecular sieve. The hydrogen drying tower is used to adsorb hydrogen at room temperature through the adsorbent inside the molecular sieve and remove moisture in the hydrogen. The output end of the hydrogen drying tower is connected to a hydrogen filter in a through manner. The hydrogen filter extracts pure hydrogen from the hydrogen drying tower and filters solid particles in the pure hydrogen. The purity of the pure hydrogen output by the hydrogen drying tower is 99.999%.

[0018] Preferably, an electric heating element is provided on the hydrogen drying tower. The working states of the Group A tower, Group B tower, and Group C tower are as follows:

[0019] The electric heating element of the hydrogen drying tower does not heat, and hydrogen with the full gas volume is introduced;

[0020] The regeneration states of the Group A tower, Group B tower, and Group C tower are as follows:

[0021] Heating stage: The electric heating element of the hydrogen drying tower heats the hydrogen and raises the temperature to 180 °C. The moisture adsorbed on the molecular sieve is gradually desorbed. When the temperature at the upper part of the dryer reaches the interlock limit value, the heating of the electric heating element stops.

[0022] Blowing and cooling stage: Hydrogen with a lower temperature flows through the hydrogen drying tower and is cooled down. The hydrogen flow rate is adjusted in real time through a regulating valve provided on the regeneration gas return pipe;

[0023] The secondary working states of the Group A tower, Group B tower, and Group C tower are as follows:

[0024] After regeneration blowing and cooling, the hydrogen passes through the hydrogen drying tower for the second time, and the remaining moisture in the hydrogen is adsorbed and removed through the molecular sieve.

[0025] Preferably, the first hydrogen compressor, the second hydrogen compressor, and the third hydrogen compressor are all diaphragm compressors. The output pressure of the diaphragm compressor is 22 Mpa. Both of the hydrogen filling columns are single-gun single-system hydrogen filling columns, and their models are X301 and X302 respectively.

[0026] Preferably, the working pressure of the unloading hose is 20 Mpa. An emergency cut-off valve is provided at the input end of the second hydrogen compressor. The emergency cut-off valve is used to cut off the gas source of the second hydrogen compressor in case of an emergency. The hydrogen compressor is electrically connected to an interlock control system.

[0027] Preferably, the hydrogenation system mainly includes a high-pressure hydrogen pipeline and a hydrogenation machine. Inside the hydrogenation machine, a pressure sensor, an overpressure protection module, and a hose pull-off protection module are installed.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] In the present invention, during the hydrogen preparation process, according to the changes in the temperature and purity of hydrogen, the operating state of the hydrogen drying tower is adjusted correspondingly, realizing the switching among three states of working, regeneration, and secondary working. Furthermore, while meeting the requirements of efficient adsorption and drying of hydrogen, the operating power consumption of the hydrogen drying tower can be reduced, effectively reducing the hydrogen preparation cost and achieving the effects of environmental protection and energy conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention;

[0031] Figure 2 It is a schematic structural diagram of the second embodiment of the present invention;

[0032] Figure 3 It is a schematic structural diagram of the third embodiment of the present invention;

[0033] Figure 4 It is a schematic flow diagram of the whole of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0035] The present invention provides three embodiments:

[0036] Embodiment 1:

[0037] Please refer to Figure 1 and Figure 4 , a method for hydrogen purification for a hydrogen card, including the following steps:

[0038] S1: Hydrogen deoxidation. In a large coking plant, the crude hydrogen separated by a gas-water separator is transported to the hydrogen purification section through a gas transmission pipeline, and successively passes through a first hydrogen-water separator, a deoxidation tower, and the shell side of a deoxidation cooler, gradually discharging water, deoxidizing, and cooling the temperature, and then enters a second hydrogen-water separator to remove the water generated in the deoxidation tower;

[0039] S2: Three-tower drying of hydrogen. The hydrogen output from the second hydrogen-water separator enters one of the operating tower groups of Group A tower, Group B tower, and Group C tower. Specifically, it successively passes through a third hydrogen-water separator, a hydrogen regeneration cooler, and a hydrogen drying tower to adsorb hydrogen and produce pure hydrogen, and then the pure hydrogen is transported to a hydrogen filter for filtration, and finally detected by a trace oxygen analyzer and a dew point meter and stored in a hydrogen storage tank;

[0040] S3: Direct hydrogen pressurization. Hydrogen stored in the hydrogen storage tank within the large coke-making plant is transported through a gas pipeline to the hydrogen buffer tank, and continuously compressed and transported into the hydrogen gas cylinder group by a third hydrogen compressor.

[0041] S4: Hydrogen filling. The hydrogen after the third hydrogen compressor is input into the hydrogen gas cylinder group for storage. The hydrogen coming out from either the third hydrogen compressor or the hydrogen gas cylinder group is transported by a gas pipeline to the hydrogenation system, enabling the hydrogenation machine to fill hydrogen into the hydrogen fuel cell through a high-pressure hydrogen pipeline.

[0042] Example 2:

[0043] Please refer to Figure 2 and Figure 4 , a hydrogen purification method for a hydrogen vehicle, including the following steps:

[0044] S1: Hydrogen deoxidation. The crude hydrogen separated by the gas-water separator is transported through a gas pipeline to the hydrogen purification section, and successively passes through the first hydrogen-water separator, the deoxidation tower, and the shell side of the deoxidation cooler to gradually remove water, deoxidize, and cool down, and then enters the second hydrogen-water separator to remove the water generated in the deoxidation tower.

[0045] S2: Three-tower hydrogen drying. The hydrogen output from the second hydrogen-water separator enters one of the operating tower groups of Group A towers, Group B towers, and Group C towers. Specifically, it successively passes through the third hydrogen-water separator, the hydrogen regeneration cooler, and the hydrogen drying tower to adsorb the hydrogen and produce pure hydrogen, and then the pure hydrogen is transported into the hydrogen filter for filtration, and finally detected by a trace oxygen analyzer and a dew point meter and stored in the hydrogen storage tank.

[0046] S3: Hydrogen pressurization and transfer. The hydrogen is transported through a gas pipeline to the hydrogen buffer tank and then continuously compressed in the first hydrogen compressor, and then transported to two hydrogen filling columns. The hydrogen filling columns are used to fill the tube trailer, and the tube trailer transports the hydrogen to the hydrogenation station area. At the same time, the high-pressure nitrogen in the nitrogen cylinder container is decompressed by a pressure reducing valve and used to purge and displace the hydrogen unloading column. The tube trailer unloads the hydrogen in the hydrogen unloading column through a unloading hose, and the hydrogen is compressed by the second hydrogen compressor and transported into the hydrogen gas cylinder group.

[0047] S4: Hydrogen filling. The hydrogen after the third hydrogen compressor is input into the hydrogen gas cylinder group for storage. The hydrogen coming out from either the third hydrogen compressor or the hydrogen gas cylinder group is transported by a gas pipeline to the hydrogenation system, enabling the hydrogenation machine to fill hydrogen into the hydrogen fuel cell through a high-pressure hydrogen pipeline.

[0048] The working pressure of the unloading hose is 20 Mpa. An emergency cut-off valve is provided at the input end of the second hydrogen compressor. The emergency cut-off valve is used to cut off the gas source of the second hydrogen compressor in case of emergency. The hydrogen compressor is electrically connected to an interlock control system.

[0049] Example 3:

[0050] Please refer to Figure 3 and Figure 4 , a method for purifying hydrogen for a hydrogen vehicle, comprising the following steps:

[0051] S1: Hydrogen deoxidation. The crude hydrogen separated by the gas-water separator is transported to a small coking plant through a gas transmission pipeline by a large coking plant. The small coking plant processes the hydrogen using a hydrogen purification section, specifically by sequentially passing through a first hydrogen-water separator, a deoxidation tower, and the shell side of a deoxidation cooler to gradually remove water, deoxidize, and cool down, and then enter a second hydrogen-water separator to remove the water generated in the deoxidation tower;

[0052] S2: Three-tower drying of hydrogen. The hydrogen output from the second hydrogen-water separator enters one of the operating tower groups of Group A tower, Group B tower, and Group C tower. Specifically, it sequentially passes through a third hydrogen-water separator, a hydrogen regeneration cooler, and a hydrogen drying tower to adsorb the hydrogen and produce pure hydrogen, and then the pure hydrogen is transported to a hydrogen filter for filtration, and finally detected by a trace oxygen analyzer and a dew point meter and stored in a hydrogen storage tank;

[0053] S3: Direct hydrogen boosting. The hydrogen is transported through a gas transmission pipeline to a hydrogen buffer tank and then continuously compressed in a third hydrogen compressor and transported to a hydrogen gas cylinder group;

[0054] S4: Hydrogen filling. The hydrogen after the third hydrogen compressor is input into the hydrogen gas cylinder group for storage. The hydrogen coming out of either the third hydrogen compressor or the hydrogen gas cylinder group is transported to a hydrogenation system through a gas transmission pipeline, so that the hydrogen filling machine fills the hydrogen into the hydrogen fuel cell through a high-pressure hydrogen pipeline.

[0055] Please refer to Figures 1 to 3 , the above three embodiments all include:

[0056] The hydrogen purification section consists of hydrogen deoxidation and three - tower hydrogen drying. The working pressure of the gas transmission pipeline in the hydrogen purification section is 3 Mpa. The first hydrogen - water separator is used to preliminarily remove the condensed water in hydrogen. A catalyst is provided in the deoxidation tower. Through the catalyst in the deoxidation tower, the impurity oxygen in hydrogen reacts with hydrogen to generate water and remove the oxygen - containing components in hydrogen. The shell - side of the cooler is connected to a cooling tower through a coolant circulation pump. The shell - side of the cooler is used to exchange heat between hydrogen and the circulating coolant in the cooling tower. The coolant circulation pump is used to boost the pressure of the circulating coolant in the cooling tower and transport it to the inside of the tube - side of the deoxidation cooler. Through hydrogen deoxidation, the separation of oxygen and the preliminary removal of moisture from crude hydrogen can be achieved.

[0057] The three - tower hydrogen drying consists of Group A tower, Group B tower and Group C tower. Pneumatic ball valves are provided between the second hydrogen - water separator and Group A tower, Group B tower and Group C tower. The three states of Group A tower, Group B tower and Group C tower are controlled by the opening and closing of the three pneumatic ball valves. Each of Group A tower, Group B tower and Group C tower consists of a third hydrogen - water separator, a hydrogen regeneration cooler and a hydrogen drying tower. A molecular sieve is fixedly provided inside the hydrogen drying tower, and an adsorbent is filled inside the molecular sieve. The hydrogen drying tower is used to adsorb hydrogen at room temperature through the adsorbent inside the molecular sieve and remove the moisture in hydrogen. The output end of the hydrogen drying tower is connected to the hydrogen filter in a through - connection manner. The hydrogen filter extracts the pure hydrogen in the hydrogen drying tower and filters the solid particles in the pure hydrogen. The purity of the pure hydrogen output from the hydrogen drying tower is 99.999%. Through the three - tower hydrogen drying, the hydrogen can be further dried to maintain the purity of hydrogen.

[0058] The three states of Group A tower, Group B tower and Group C tower are respectively:

[0059] Group A tower is working, Group B tower is being regenerated and Group C is working;

[0060] Group A tower is working for the second time, Group B tower is working and Group C is being regenerated;

[0061] Group A tower is being regenerated, Group B tower is working for the second time and Group C is working;

[0062] Group A tower, Group B tower and Group C tower periodically complete drying, regeneration and dehydration work

[0063] An electric heating element is provided on the hydrogen drying tower. The working states of Group A tower, Group B tower and Group C tower are:

[0064] The electric heating element of the hydrogen drying tower is not heated and the full - volume hydrogen is introduced;

[0065] The regeneration states of Group A tower, Group B tower and Group C tower are:

[0066] Heating stage: The electric heating element of the hydrogen drying tower heats the hydrogen and raises it to 180°C. The moisture adsorbed on the molecular sieve is gradually desorbed. When the temperature at the upper part of the dryer reaches the interlock limit value, the heating of the electric heating element stops.

[0067] Blowing and cooling stage: The hydrogen with a lower temperature flows through the hydrogen drying tower for cooling. The hydrogen flow rate is adjusted in real time through a regulating valve provided on the regeneration gas return pipe.

[0068] The secondary working states of Group A tower, Group B tower, and Group C tower are as follows:

[0069] The hydrogen after regeneration blowing and cooling passes through the hydrogen drying tower again and the remaining moisture in the hydrogen is adsorbed and removed by the molecular sieve. By cyclically switching the operating states of Group A tower, Group B tower, and Group C tower, the efficient treatment operation of hydrogen can be satisfied, and it is convenient for energy saving of Group A tower, Group B tower, and Group C tower.

[0070] The first hydrogen compressor, the second hydrogen compressor, and the third hydrogen compressor are all diaphragm compressors. The output pressure of the diaphragm compressor is 22 Mpa. Both hydrogen filling columns are single-gun single-system hydrogen filling columns, and their models are X301 and X302 respectively. The hydrogenation system mainly includes high-pressure hydrogen pipelines and hydrogenation machines. Inside the hydrogenation machine, there are installed a pressure sensor, an overpressure protection module, and a hose pull-off protection module. Through the pressure sensor, the overpressure protection module, and the hose pull-off protection module, the stable operation of the hydrogenation machine can be ensured.

[0071] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A method for hydrogen purification used in a hydrogen card, characterized in that, It includes the following steps: S1: Hydrogen deoxidation. The crude hydrogen separated by the gas-water separator is transported to the hydrogen purification section through the gas transmission pipeline, and successively passes through the first hydrogen-water separator, the deoxidation tower and the shell side of the deoxidation cooler to gradually remove water, deoxidize and cool down, and then enters the second hydrogen-water separator to remove the water generated in the deoxidation tower. S2: Three-tower drying of hydrogen. The hydrogen output from the second hydrogen-water separator enters one of the operating tower groups of Group A tower, Group B tower and Group C tower. Specifically, it successively passes through the third hydrogen-water separator, the hydrogen regeneration cooler and the hydrogen drying tower to adsorb hydrogen and produce pure hydrogen, and then the pure hydrogen is transported to the hydrogen filter for filtration. Finally, it is detected by a trace oxygen analyzer and a dew point meter and stored through a hydrogen storage tank. S3: Hydrogen pressurization and transfer. The hydrogen is transported through the gas transmission pipeline to the hydrogen buffer tank and then continuously compressed in the first hydrogen compressor, and then transported to two hydrogen filling columns. The hydrogen filling columns are used to fill the tube trailers with hydrogen and the hydrogen is transported to the hydrogen refueling station area through the hydrogen tube trailer. At the same time, the high-pressure nitrogen in the nitrogen cylinder container is decompressed through a pressure reducing valve to purge and replace the hydrogen unloading column. The hydrogen in the hydrogen unloading column is unloaded by the tube trailer through the unloading hose, and the hydrogen is compressed by the second hydrogen compressor and transported to the hydrogen gas cylinder group. S4: Direct hydrogen pressurization. The hydrogen is transported through the gas transmission pipeline to the hydrogen buffer tank and then continuously compressed in the third hydrogen compressor and transported to the hydrogen gas cylinder group. S5: Hydrogen filling. The hydrogen compressed by the hydrogen compressor is input into the hydrogen gas cylinder group for storage. The hydrogen coming out from either the hydrogen compressor or the hydrogen gas cylinder group is transported to the hydrogen refueling system through the gas transmission pipeline, so that the hydrogen filling machine fills the hydrogen into the hydrogen fuel cell through the high-pressure hydrogen pipeline.

2. The hydrogen purification method for a hydrogen card according to claim 1, wherein: The hydrogen purification section consists of hydrogen deoxidation and three-tower drying of hydrogen. The working pressure of the gas transmission pipeline in the hydrogen purification section is 3 Mpa. The first hydrogen-water separator is used to preliminarily remove the condensed water in the hydrogen. The deoxidation tower is provided with a catalyst. The deoxidation tower uses the catalyst to react the impurity oxygen in the hydrogen with hydrogen to generate water and remove the oxygen-containing components in the hydrogen. The shell side of the cooler is connected to a cooling water tower through a coolant circulation pump. The shell side of the cooler is used to exchange heat between the hydrogen and the circulating coolant in the cooling water tower. The coolant circulation pump is used to boost the pressure of the circulating coolant in the cooling water tower and transport it to the inside of the tube side of the deoxidation cooler.

3. A hydrogen purification method for a hydrogen card according to claim 2, characterized in that: The three-tower drying of hydrogen consists of Group A tower, Group B tower and Group C tower. Pneumatic ball valves are provided between the second hydrogen-water separator and Group A tower, Group B tower and Group C tower. The three states of Group A tower, Group B tower and Group C tower are controlled by the opening and closing of three pneumatic ball valves. The three states of Group A tower, Group B tower and Group C tower are respectively: Group A tower is working, Group B tower is regenerating and Group C tower is working; Group A tower is working for the second time, Group B tower is working and Group C tower is regenerating; Group A tower is regenerating, Group B tower is working for the second time and Group C tower is working; The Group A tower, Group B tower and Group C tower periodically complete the work of drying, regeneration and dehydration.

4. A hydrogen purification method for a hydrogen card according to claim 3, characterized in that: The A-group tower, B-group tower, and C-group tower are each composed of a third hydrogen-water separator, a hydrogen regeneration cooler, and a hydrogen drying tower. Inside the hydrogen drying tower, a molecular sieve is fixedly provided, and an adsorbent is filled inside the molecular sieve. The hydrogen drying tower is used to adsorb hydrogen at room temperature through the adsorbent inside the molecular sieve and remove moisture in the hydrogen. The output end of the hydrogen drying tower is connected in communication with a hydrogen filter. The hydrogen filter extracts pure hydrogen in the hydrogen drying tower and filters solid particles from the pure hydrogen. The purity of the pure hydrogen output by the hydrogen drying tower is 99.999%.

5. A hydrogen purification method for a hydrogen card according to claim 4, characterized in that: An electric heating element is provided on the hydrogen drying tower. The working states of the A-group tower, B-group tower, and C-group tower are as follows: The electric heating element of the hydrogen drying tower does not heat, and the full gas volume of hydrogen is introduced. The regeneration states of the A-group tower, B-group tower, and C-group tower are as follows: Heating stage: The electric heating element of the hydrogen drying tower heats the hydrogen and raises it to 180°C. The moisture adsorbed on the molecular sieve is gradually desorbed, and when the temperature at the upper part of the dryer reaches the interlock limit value, the heating of the electric heating element stops. Blowing and cooling stage: The hydrogen with a lower temperature flows through the hydrogen drying tower and cools down. The hydrogen flow rate is adjusted in real time through a regulating valve provided on the regeneration gas return pipe. The secondary working states of the A-group tower, B-group tower, and C-group tower are as follows: The hydrogen after regeneration blowing and cooling passes through the hydrogen drying tower a second time, and the remaining moisture in the hydrogen is adsorbed and removed through the molecular sieve.

6. A hydrogen purification method for a hydrogen card according to claim 5, characterized in that: The first hydrogen compressor, second hydrogen compressor, and third hydrogen compressor are all diaphragm compressors. The output pressure of the diaphragm compressor is 22 Mpa. The two hydrogen filling columns are both single-gun single-system hydrogen filling columns, and their models are X301 and X302 respectively.

7. A hydrogen purification method for a hydrogen card according to claim 6, characterized in that: The working pressure of the unloading hose is 20 Mpa. An emergency cut-off valve is provided at the input end of the second hydrogen compressor. The emergency cut-off valve is used to cut off the gas source of the second hydrogen compressor in an emergency. The hydrogen compressor is electrically connected to an interlock control system.

8. A hydrogen purification method for a hydrogen card according to claim 7, characterized in that: The hydrogenation system mainly includes a high-pressure hydrogen pipeline and a hydrogenation machine. Inside the hydrogenation machine, a pressure sensor, an overpressure protection module, and a hose pull-off protection module are installed.

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