A hydrogen purification system and method

Abstract

The invention relates to the technical field of hydrogen purification. The invention discloses a hydrogen purification system and method, comprising a deoxidizer, a cooler, a metal oxide hydrogen storage mechanism, a filter dryer, and a micro-impurity adsorber. The deoxidizer and the cooler are connected in series through a pipeline. The cooler is connected in parallel with two multiplexed turbulent multi-channel dehumidifiers through a pipeline. The multiplexed turbulent multi-channel dehumidifier controls the humidity of hydrogen to be below 60% and then transports it to the filter dryer for secondary dehumidification, and then discharges it to obtain low-purity hydrogen. The metal oxide purification is coupled with the electrolytic water hydrogen production purification to prepare hydrogen after deoxygenation and purification of the electrolytic water hydrogen production. At the same time, when applied to the high-purity hydrogen processing process, the metal oxide purification is combined with the electrolytic water hydrogen production purification to ensure the service life of the metal oxide. At the same time, a small amount of high-purity hydrogen can be used as pipeline cleaning gas and dry reducing gas, so as to lay a good foundation for high-purity hydrogen batch processing.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen purification, and in particular to a hydrogen purification system and method. Background Art

[0002] In the process of producing hydrogen by electrolysis of water, the impurities of hydrogen are mainly oxygen, nitrogen, methane and other impurities. The purity of hydrogen can reach about 99.5%. The content of other impurities except oxygen is related to the cleanliness of pipelines and equipment. Due to the small content of impurities, hydrogen produced directly by electrolysis of water can be directly used for equipment with low purity requirements, but further purification is required for equipment with high purity requirements.

[0003] Considering the type and output of hydrogen produced by water electrolysis, the most suitable solution for hydrogen production by water electrolysis is to use a palladium catalyst to react hydrogen and oxygen to form water, and to adsorb the high-water content gas through a drying filter, such as activated alumina or molecular sieve, thereby improving the purity of the hydrogen. Furthermore, special filters can be used to carry out targeted absorption of nitrogen, methane or other impurities to obtain higher purity hydrogen.

[0004] Activated alumina or molecular sieve will be saturated with adsorption, so at present, at least two dry filters are set up, and part of the generated hydrogen is used as reducing gas to heat, purge and reduce the dry filters. The dry filters need to work alternately.

[0005] The long-term deoxygenation and purification steps will cause trace impurities to contaminate pipelines and equipment. Although the final hydrogen concentration can meet the usage standards, when higher purity hydrogen needs to be prepared, the trace impurities in the pipeline can easily cause the purity of the final high-purity hydrogen to be lower than the expected purity. Summary of the invention

[0006] The object of the present invention is to provide a hydrogen purification system and method, which couples metal oxide purification with water electrolysis hydrogen purification, and prepares hydrogen after deoxygenation and purification by water electrolysis hydrogen. At the same time, when applied to high-purity hydrogen processing, the metal oxide purification is combined with water electrolysis hydrogen purification to ensure the service life of the metal oxide. At the same time, a small amount of high-purity hydrogen can be used as pipeline cleaning gas and dry reducing gas, laying a good foundation for high-purity hydrogen batch processing. In addition, the reuse structure of the reused turbulent multi-channel desiccant can reduce the humidity level, increase the molecular sieve saturation process time, and reduce the number of drying filters, thereby simplifying the pipeline and reducing the amount of hydrogen used for pipeline cleaning, thereby solving the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A hydrogen purification system, comprising a deoxidizer, a cooler, a metal oxide hydrogen storage mechanism, a filter dryer, and a micro-impurity adsorber, wherein the deoxidizer and the cooler are connected in series through a pipeline, and the cooler is connected in parallel with two multiplexed turbulent multi-channel dehumidifiers through a pipeline, and the multiplexed turbulent multi-channel dehumidifier controls the humidity of hydrogen to be below 60%, and then transports the hydrogen to the filter dryer for secondary dehumidification, and then discharges the hydrogen to obtain low-purity hydrogen;

[0009] The dry filter is connected in series with the metal oxide hydrogen storage mechanism through a pipeline, the dry filter transports low-purity hydrogen to the metal oxide hydrogen storage mechanism, and the metal oxide in the metal oxide hydrogen storage mechanism absorbs hydrogen, the metal oxide hydrogen storage mechanism is connected in series with the cooler through a pipeline, and the metal oxide hydrogen storage mechanism releases the adsorbed high-purity hydrogen through the cooler and the reused turbulent multi-channel moisture absorber pipeline and transports it to the inside of the dry filter for reduction of the dry filter;

[0010] The drying filter is connected in series with the micro-impurity adsorber through a pipeline to transport low-purity hydrogen to the micro-impurity adsorber to remove trace impurities.

[0011] As a further solution of the present invention: the reused turbulent multi-channel desiccant includes a middle flow channel and a side flow channel, the side flow channels are located on both sides of the middle flow channel, and both ends of the side flow channels are connected to the middle flow channel, and the angle between the terminal outlet direction of the side flow channel and the conveying direction of the middle flow channel is an acute angle.

[0012] As a further solution of the present invention: three columnar liquid absorbents distributed in a triangle are arranged at the intersection of the end of the conveying side flow channel and the middle flow channel, two of the horizontally distributed columnar liquid absorbents are located at the outlet of the side flow channel, and the other columnar liquid absorbent is located on the side of the horizontally distributed columnar liquid absorbent close to the air inlet end of the middle flow channel, the three columnar liquid absorbents have the same diameter, and the minimum spacing between the two horizontal columnar liquid absorbents is smaller than the diameter of the columnar liquid absorbent.

[0013] As a further solution of the present invention: it also includes a water collector and a liquid supply device. After the columnar liquid aspirator removes the adsorbed liquid by squeezing and replacing, the liquid is collected by the water collector and transported to the liquid supply device, and the liquid supply device circulates the cooling liquid to the cooler.

[0014] As a further solution of the present invention: it also includes a humidity sensor, which is arranged at the discharge end of the multiplexed turbulent multi-channel desiccant, and the humidity sensor is connected to the inlet end of another multiplexed turbulent multi-channel desiccant through a pipeline.

[0015] As a further solution of the present invention: the high-purity hydrogen released by the metal oxide hydrogen storage mechanism is divided into two streams and flows to the drying filter through the two channels of the multiplexed turbulent multi-channel desiccant respectively.

[0016] As a further embodiment of the present invention, a hydrogen purification system includes a method for use in the following situations:

[0017] Preparation of low-purity hydrogen: The hydrogen produced by electrolysis of water contains trace impurities such as oxygen, nitrogen, and methane, and its purity is generally around 99.5%. The hydrogen is first processed by the deoxidizer, and the hydrogen and oxygen react to produce water through a palladium catalyst, thereby removing the oxygen inside the hydrogen to form high-humidity hydrogen. After the high-humidity hydrogen is cooled by the cooler, it alternately passes through the channels of the two multiplexed turbulent multi-channel desiccant. In the multiplexed turbulent multi-channel desiccant, the main airflow enters through the middle flow channel and is divided by the side flow channel. When the three airflows pass through the columnar aspirator, they flow backward through both sides of the columnar aspirator, and at the same time, the gas in the columnar aspirator A turbulent zone is formed behind the flow, and the angle between the direction of the airflow coming out of the side gap of the side channel and the direction of the airflow in the middle channel is an acute angle. The airflow in the side channel hinders the flow of the airflow in the middle channel, thereby forming secondary turbulence, and the turbulent zones behind the three columnar aspirators are staggered to form a more complex airflow motion trajectory, so that the airflow can fully contact the surface of the columnar aspirator, so that the columnar aspirator absorbs moisture and reduces the humidity of hydrogen to below 60%. Hydrogen with a humidity below 60% is further reduced in moisture through the molecular sieve inside the drying filter. When the purity meets the requirements under trace amounts of impurities such as nitrogen and methane, it can be directly discharged to obtain low-purity hydrogen;

[0018] Preparation of high-purity hydrogen: During the preparation of low-purity hydrogen, it is easy to produce impurity residue problems due to the pollution of pipelines and equipment. Therefore, during the preparation of low-purity hydrogen, a part of the hydrogen is transported to the metal oxide hydrogen storage mechanism. Since trace amounts of nitrogen and methane have little effect on metal oxides, the service life of the metal oxide hydrogen storage mechanism can be guaranteed, and the purity of hydrogen obtained by the metal oxide hydrogen storage mechanism can reach 99.9999%, but it is not suitable for large-scale continuous preparation. Therefore, the high-purity hydrogen stored by the metal oxide hydrogen storage mechanism is easy to store. Before the preparation of high-purity hydrogen, the high-purity hydrogen is released through the metal oxide hydrogen storage mechanism, and the pipeline of the low-purity hydrogen preparation process is flushed to reduce impurities. The flushed gas enters the dry filter. After the internal molecular sieve is purged during the reduction process of the dry filter, the low-purity hydrogen preparation process is repeated, and the gas discharged from the dry filter is directed through the micro-impurity adsorber to extract impurities, and then large-scale high-purity hydrogen is prepared.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The metal oxide purification is coupled with the water electrolysis hydrogen purification, and the hydrogen after deoxygenation and purification by water electrolysis is prepared. At the same time, when applied to high-purity hydrogen processing, the metal oxide purification is combined with the water electrolysis hydrogen purification to ensure the service life of the metal oxide. At the same time, a small amount of high-purity hydrogen can be used as pipeline cleaning gas and dry reducing gas, laying a good foundation for high-purity hydrogen batch processing. The reuse structure of the turbulent multi-channel desiccant can reduce the humidity level, increase the molecular sieve saturation process time, and reduce the number of drying filters, thereby simplifying the pipeline, reducing the amount of hydrogen used for pipeline cleaning, and making it more convenient to clean, thereby greatly reducing the impact of pipelines and equipment on purity when preparing high-purity hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A diagram of a hydrogen purification system;

[0023] Figure 2 A schematic diagram of low-purity hydrogen processing in a hydrogen purification system;

[0024] Figure 3 A schematic diagram of high-purity hydrogen purge in a hydrogen purification system;

[0025] Figure 4 A schematic diagram of partial purification and storage of metal oxides of low-purity hydrogen in a hydrogen purification system;

[0026] Figure 5 A schematic diagram of high-purity hydrogen processing in a hydrogen purification system;

[0027] Figure 6 A schematic diagram of a two-stage humidity control of a multiplexed turbulent multi-channel dehumidifier in a hydrogen purification system;

[0028] Figure 7 A schematic diagram of a reused turbulent multi-pass dehumidifier in a hydrogen purification system;

[0029] Figure 8 It is a gas flow diagram of a reused turbulent multi-pass dehumidifier in a hydrogen purification system;

[0030] In the figure: 1. Deaerator; 2. Cooler; 3. Multiplexed turbulent multi-channel desiccant; 31. Middle flow channel; 32. Side flow channel; 33. Columnar liquid absorber; 4. Metal oxide hydrogen storage mechanism; 5. Dry filter; 6. Micro-impurity adsorber; 7. Water collector; 8. Liquid supplier; 9. Humidity sensor. DETAILED DESCRIPTION

[0031] See also Figure 1-Figure 8 In this embodiment: it includes a deoxidizer 1, a cooler 2, a metal oxide hydrogen storage mechanism 4, a drying filter 5, and a micro-impurity adsorber 6. The deoxidizer 1 and the cooler 2 are connected in series through a pipeline. The cooler 2 is connected in parallel with two multiplexed turbulent multi-channel desiccant devices 3 through a pipeline. The multiplexed turbulent multi-channel desiccant devices 3 control the humidity of hydrogen to below 60% and then transport it to the drying filter 5 for secondary dehumidification, and then discharge it to obtain low-purity hydrogen.

[0032] In this embodiment: after the drying filter 5 generally works for a period of time, the molecular sieve needs to be reduced when it is saturated with adsorption. The reduction is carried out by heating combined with hydrogen purging. Therefore, part of the prepared hydrogen needs to be used as reducing gas. When the humidity is lower than 60%, the adsorption amount of the molecular sieve is greater than that of activated alumina. Therefore, the airflow is adjusted by reusing the turbulent multi-channel desiccant 3 so that the airflow passes through the columnar liquid absorber 33 to reduce the humidity. If a through-shaped structure is used, such as a cotton filter, the disadvantage is that the kinetic energy loss is too large after the wind passes through, and the filter will quickly become saturated with adsorption and need to be replaced frequently. The humidity is reduced too much. Although the service life of the drying filter 5 can be maximized, the replacement cycle of the filter is increased, and pressure replenishment is required to ensure that the hydrogen can complete the subsequent journey.

[0033] In this embodiment: the reused turbulent multi-channel desiccant 3 includes a middle channel 31 and a side channel 32. The side channels 32 are located on both sides of the middle channel 31, and both ends of the side channels 32 are connected to the middle channel 31. The angle between the terminal outlet direction of the side channel 32 and the conveying direction of the middle channel 31 is an acute angle. Three columnar liquid absorbents 33 distributed in a triangle are arranged at the intersection of the terminal of the conveying side channel 32 and the middle channel 31. Two horizontally distributed columnar liquid absorbents 33 are located at the outlet of the side channel 32, and another columnar liquid absorbent 33 is located on the side of the horizontally distributed columnar liquid absorbent 33 close to the air inlet end of the middle channel 31. The three columnar liquid absorbents 33 have the same diameter, and the minimum spacing between the two horizontal columnar liquid absorbents 33 is smaller than the diameter of the columnar liquid absorbent 33.

[0034] In this embodiment: First, after hydrogen enters through the middle channel 31, a part of it is diverted to the side channel 32, and is guided by the side channel 32, so that the wind at the outlet of the side channel 32 will contact the wind passing through the columnar aspirator 33 on the side of the middle channel 31 to form turbulence, and when the gas passes through the columnar aspirator 33, the wind will flow through the side of the columnar aspirator 33 and form turbulence behind the columnar aspirator 33, please refer to Figure 8 , a turbulent mixing zone is formed between the three columnar absorbents 33, so that the airflow can contact and remain on the outer wall of the columnar absorbent 33, and the middle part of the columnar absorbent 33 can be a solid structure to block wind, so that the wind can pass through the side wall of the columnar absorbent 33. In actual application, the adsorption layer of the columnar absorbent 33 is an elastic multiplex structure, such as sponge, cotton cloth, etc., and the liquid in the columnar absorbent 33 is taken out by squeezing, twisting, replacing, etc. The columnar absorbent 33 is still non-blocking. The method still has a non-blocking flow channel, so the kinetic energy loss of the airflow is small compared to the kinetic energy loss of passing through the filter, and the probability of the airflow contacting the side of the columnar absorbent 33 can be increased.

[0035] In this embodiment: a valve is provided on the parallel pipeline between the multiplexed turbulent multi-channel desiccant 3 and the cooler 2, and the valve is controlled by a PLC controller. The PLC controller controls the two multiplexed turbulent multi-channel desiccant 3 to start working alternately, thereby ensuring that the columnar liquid absorber 33 can pause the air intake and then drain the water.

[0036] In this embodiment: the dry filter 5 is connected in series with the metal oxide hydrogen storage mechanism 4 through a pipeline, the dry filter 5 transports low-purity hydrogen to the metal oxide hydrogen storage mechanism 4, and the metal oxide in the metal oxide hydrogen storage mechanism 4 absorbs hydrogen, the metal oxide hydrogen storage mechanism 4 is connected in series with the cooler 2 through a pipeline, the metal oxide hydrogen storage mechanism 4 releases the adsorbed high-purity hydrogen through the cooler 2, reuses the turbulent multi-channel desiccant 3 pipeline and transports it to the inside of the dry filter 5 for reduction of the dry filter 5.

[0037] In this embodiment: since the humidity of hydrogen decreases after adsorption by the reused turbulent multi-channel desiccant 3, the service life of a single dry filter 5 increases, while the reduction time of the dry filter 5 of the same volume is fixed. When the service life of the dry filter 5 increases, relative to the hydrogen that has not been treated by the reused turbulent multi-channel desiccant 3, the number of dry filters 5 is less than the number that has not been treated by the reused turbulent multi-channel desiccant 3, thereby simplifying the pipeline. The advantage of simplifying the pipeline is that it facilitates the subsequent pipeline cleaning, and the reduction in pipeline length can also solve the influence of pipeline pollution on the purity of subsequent high-purity hydrogen preparation.

[0038] In this embodiment: the dry filter 5 is connected in series with the micro-impurity adsorber 6 through a pipeline, and the low-purity hydrogen is transported to the micro-impurity adsorber 6 to remove trace impurities. Therefore, a metal oxide hydrogen storage mechanism 4 is set. The metal oxide hydrogen storage mechanism 4 is a metal oxide. Under the control of the environment, the metal oxide can selectively fix hydrogen or released hydrogen. Although this method has a simple structure and high hydrogen purity, the metal oxide has the problem of failure. When there are too many impurities, the metal oxide is prone to failure. However, in the process of hydrogen production by electrolysis of water, the impurity content is small. By coupling the metal oxide hydrogen storage mechanism 4 with the hydrogen production purification system by electrolysis of water, the purity of hydrogen can be reduced for purification and storage. When the production standard is changed, the hydrogen can be released through the metal oxide hydrogen storage mechanism 4, so that the high-purity hydrogen passes through the cooler 2, the reused turbulent multi-channel desiccant 3, and the dry filter 5 pipeline, the pipeline is cleaned, and the dry filter 5 is purged and reduced at the same time. Therefore, when the low-purity hydrogen passes through the micro-impurity adsorber 6 for secondary treatment, the problem of low purity during continuous processing of high-purity hydrogen due to pipeline contamination will not occur.

[0039] In this embodiment: it also includes a water collector 7 and a liquid supply device 8. After the columnar liquid absorber 33 removes the adsorbed liquid by squeezing and replacing, the liquid is collected by the water collector 7 and transported to the liquid supply device 8. The liquid supply device 8 transports the cooling liquid to the cooler 2 for circulation.

[0040] In this embodiment: Since the reused turbulent multi-channel desiccant 3 collects liquid during the circulation process, and the cooler 2 needs to be cooled by the coolant, a water collector 7 is provided. The water collector 7 can collect the liquid of the reused turbulent multi-channel desiccant 3 and perform a refrigeration cycle on the cooler 2 through the liquid supply device 8.

[0041] In this embodiment: it also includes a humidity sensor 9, which is arranged at the discharge end of the multiplexed turbulent multi-channel desiccant 3, and the humidity sensor 9 is connected to the inlet end of another multiplexed turbulent multi-channel desiccant 3 through a pipeline.

[0042] In this embodiment: In actual use, it is necessary to consider the problem that the humidity is still high after filtering by the multiplexed turbulent multi-channel dehumidifier 3, so a humidity sensor 9 is set. This method is mainly used for emergency. When the humidity of the gas after passing through the multiplexed turbulent multi-channel dehumidifier 3 is too high, the flow channel is switched through the humidity sensor 9, so that the gas passes through the multiplexed turbulent multi-channel dehumidifier 3 for secondary treatment. At this time, the two multiplexed turbulent multi-channel dehumidifiers 3 are in the series stage. This situation is only used for emergency treatment. Under normal circumstances, the two multiplexed turbulent multi-channel dehumidifiers 3 are opened alternately.

[0043] In this embodiment: the high-purity hydrogen released by the metal oxide hydrogen storage mechanism 4 is divided into two streams and flows to the drying filter 5 through the channels of the two reused turbulent multi-channel moisture absorbers 3 respectively.

[0044] In this embodiment: since the two multiplexed turbulent multi-channel desiccant breathers 3 are both provided with pipes and hydrogen passes through them alternately, the hydrogen released by the metal oxide hydrogen storage mechanism 4 needs to be cleaned by passing through the pipes of the two multiplexed turbulent multi-channel desiccant breathers 3 .

[0045] In this embodiment, the number of the drying filters 5 is determined according to the situation. The number of the drying filters 5 can be 1 or 2. Although this method can reduce the number of the drying filters 5, the actual situation needs to be reasonably adjusted according to the production specifications.

[0046] Directions:

[0047] Preparation of low-purity hydrogen: The hydrogen produced by water electrolysis contains trace impurities such as oxygen, nitrogen, and methane, and its purity is generally around 99.5%. The hydrogen is first processed by a deoxidizer 1, and the hydrogen and oxygen react to produce water through a palladium catalyst, thereby removing the oxygen inside the hydrogen to form high-humidity hydrogen. After the high-humidity hydrogen is cooled by a cooler 2, it alternately passes through the channels of two reused turbulent multi-channel desiccant 3. In the reused turbulent multi-channel desiccant 3, the main airflow enters through the middle flow channel 31 and is divided by the side flow channel 32. When the three airflows pass through the columnar liquid absorber 33, they flow backward through both sides of the columnar liquid absorber 33, and at the same time, the airflow behind the columnar liquid absorber 33 is square. A turbulent zone is formed, and the angle between the airflow direction coming out of the side gap of the side channel 32 and the airflow direction of the middle channel 31 is an acute angle. The airflow in the side channel 32 hinders the airflow in the middle channel 31, thereby forming secondary turbulence, and the turbulent zones behind the three columnar aspirators 33 are staggered to form a more complex airflow motion trajectory, so that the airflow can fully contact the surface of the columnar aspirator 33, so that the columnar aspirator 33 absorbs moisture and reduces the humidity of hydrogen to below 60% at the same time. The hydrogen with a humidity below 60% is further reduced in moisture by passing through the molecular sieve inside the drying filter 5. When the purity meets the requirements under trace amounts of impurities such as nitrogen and methane, it can be directly discharged to obtain low-purity hydrogen;

[0048] Preparation of high-purity hydrogen: During the preparation of low-purity hydrogen, it is easy to produce impurity residue problems due to the pollution of pipelines and equipment. Therefore, during the preparation of low-purity hydrogen, a part of the hydrogen is transported to the metal oxide hydrogen storage mechanism 4. Since trace amounts of nitrogen and methane have little effect on metal oxides, the service life of the metal oxide hydrogen storage mechanism 4 can be guaranteed, and the purity of the hydrogen obtained by the metal oxide hydrogen storage mechanism 4 can reach 99.9999%, but it is not suitable for large-scale continuous preparation. Therefore, the high-purity hydrogen stored by the metal oxide hydrogen storage mechanism 4 is easy to store. Before the preparation of high-purity hydrogen, the high-purity hydrogen is released through the metal oxide hydrogen storage mechanism 4, and the pipeline of the low-purity hydrogen preparation process is flushed to reduce impurities. The flushed gas enters the drying filter 5. After the internal molecular sieve is purged during the reduction process of the drying filter 5, the low-purity hydrogen preparation process is repeated, and the gas discharged from the drying filter 5 is directed to extract impurities through the micro-impurity adsorber 6, and then large-scale high-purity hydrogen is prepared.

[0049] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydrogen purification system, comprising a deoxidizer (1), a cooler (2), a metal oxide hydrogen storage mechanism (4), a drying filter (5), and a micro-impurity adsorber (6), characterized in that: The deoxidizer (1) and the cooler (2) are connected in series via a pipeline, and the cooler (2) is connected in parallel with two multiplexed turbulent multi-channel dehumidifiers (3) via a pipeline. The multiplexed turbulent multi-channel dehumidifiers (3) control the humidity of hydrogen to below 60% and then transport it to the drying filter (5) for secondary dehumidification, and then discharge it to obtain low-purity hydrogen; The dry filter (5) is connected in series with the metal oxide hydrogen storage mechanism (4) through a pipeline. The dry filter (5) transports low-purity hydrogen to the metal oxide hydrogen storage mechanism (4), and the metal oxide in the metal oxide hydrogen storage mechanism (4) absorbs hydrogen. The metal oxide hydrogen storage mechanism (4) is connected in series with the cooler (2) through a pipeline. The metal oxide hydrogen storage mechanism (4) releases the adsorbed high-purity hydrogen through the cooler (2) and the pipeline of the reused turbulent multi-channel moisture absorber (3) and transports it to the inside of the dry filter (5) for reduction of the dry filter (5); The drying filter (5) is connected in series with the micro-impurity adsorber (6) via a pipeline, so as to transport low-purity hydrogen to the micro-impurity adsorber (6) to remove trace impurities; The multiplexed turbulent multi-channel dehumidifier (3) comprises a central flow channel (31) and a side flow channel (32), wherein the side flow channels (32) are located on both sides of the central flow channel (31), and both ends of the side flow channels (32) are connected to the central flow channel (31), and the angle between the terminal outlet direction of the side flow channel (32) and the conveying direction of the central flow channel (31) is an acute angle; a triangular distribution is arranged at the intersection of the terminal of the conveying side flow channel (32) and the central flow channel (31) The three columnar liquid absorbents (33) are provided, two of the columnar liquid absorbents (33) distributed horizontally are located at the outlet of the side flow channel (32), and another columnar liquid absorbent (33) is located on the side of the horizontally distributed columnar liquid absorbent (33) close to the air inlet end of the middle flow channel (31), the three columnar liquid absorbents (33) have the same diameter, and the minimum spacing between the two horizontal columnar liquid absorbents (33) is smaller than the diameter of the columnar liquid absorbent (33).

2. A hydrogen purification system according to claim 1, characterized in that: It also comprises a water collector (7) and a liquid supply device (8); after the columnar liquid absorber (33) removes the adsorbed liquid by squeezing and replacing, the liquid is collected by the water collector (7) and transported to the liquid supply device (8); the liquid supply device (8) transports the cooling liquid to the cooler (2) in a circulation manner.

3. A hydrogen purification system according to claim 2, characterized in that: It also comprises a humidity sensor (9), which is arranged at the discharge end of the multiplexed turbulent multi-channel dehumidifier (3), and the humidity sensor (9) is connected to the inlet end of another multiplexed turbulent multi-channel dehumidifier (3) through a pipeline.

4. A hydrogen purification system according to claim 3, characterized in that: The high-purity hydrogen released by the metal oxide hydrogen storage mechanism (4) is divided into two streams and flows through the channels of the two reused turbulent multi-channel moisture absorbers (3) to the drying filter (5).

5. A purification method for a hydrogen purification system, characterized in that: The purification method is used in a hydrogen purification system as claimed in claim 4, and the purification method comprises: Preparation of low-purity hydrogen: The hydrogen produced by water electrolysis contains trace impurities of O2, N2, and CH4, and has a purity of about 99.5%. The hydrogen is first processed by the deoxidizer (1), and the hydrogen and oxygen react to produce water through a palladium catalyst, thereby removing the oxygen inside the hydrogen to form high-humidity hydrogen. After the high-humidity hydrogen is cooled by the cooler (2), it alternately passes through the channels of the two multiplexed turbulent multi-channel dehumidifiers (3). In the multiplexed turbulent multi-channel dehumidifier (3), the main airflow enters through the middle flow channel (31) and is divided by the side flow channel (32). When the three airflows pass through the columnar liquid absorber (33), they flow backward through the two sides of the columnar liquid absorber (33), and at the same time, the three airflows flow backward through the two sides of the columnar liquid absorber (33). A turbulent zone is formed behind the airflow of the liquid absorber (33), and the direction of the airflow coming out of the side slit of the side channel (32) is at an acute angle to the direction of the airflow in the middle channel (31). The airflow in the side channel (32) hinders the flow of the airflow in the middle channel (31), thereby forming secondary turbulence, and the turbulent zones behind the three columnar absorbers (33) are staggered, so that the airflow is fully in contact with the surface of the columnar absorber (33), so that the columnar absorber (33) absorbs moisture and reduces the humidity of hydrogen to below 60%. The hydrogen with a humidity below 60% is further reduced in moisture by passing through the molecular sieve inside the drying filter (5). When the purity meets the requirements in the presence of trace amounts of N2 and CH4 impurities, it is directly discharged to obtain low-purity hydrogen; Preparation of high-purity hydrogen: During the preparation of low-purity hydrogen, a portion of the hydrogen is transported to the metal oxide hydrogen storage mechanism (4), and the purity of the hydrogen obtained by the metal oxide hydrogen storage mechanism (4) can reach 99.9999%. The high-purity hydrogen stored by the metal oxide hydrogen storage mechanism (4) is easy to store. Before the preparation of high-purity hydrogen, the high-purity hydrogen is released by the metal oxide hydrogen storage mechanism (4), and the pipeline of the low-purity hydrogen preparation process is flushed to reduce impurities. The flushed gas enters the drying filter (5). After the internal molecular sieve is purged during the reduction process of the drying filter (5), the low-purity hydrogen preparation process is repeated, and the gas discharged from the drying filter (5) is subjected to directionally extracted impurities through the micro-impurity adsorber (6), and then a large amount of high-purity hydrogen is prepared.

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