A hydrogen purification system for hydrogen production by water electrolysis

Abstract

The utility model provides a kind of hydrogen purification system for water electrolysis hydrogen production, including deoxidation unit, drying unit and three-way valve for connecting deoxidation unit and drying unit, deoxidation unit is used to remove trace oxygen in crude hydrogen, two intermittent operation main drying tower are equipped in drying unit, a pre-drying tower for regeneration process, heater, first cooler and first water segregator, when one main drying tower carries out drying process, other main drying tower, pre-drying tower, heater, first cooler and first water segregator cooperate to complete hot blowing process and cold blowing process in regeneration process, the equipment quantity of this system is less, and the area is small, process is simple. Moreover, pre-drying tower, heater, cooler and other equipment in drying unit are always in running state in the process of normal operation of the system, without standby state, equipment utilization is high, equipment investment is small, and the scope of application is wide.

Description

Technical Field

[0001] This utility model belongs to the field of water electrolysis hydrogen production technology, specifically relating to a hydrogen purification system for water electrolysis hydrogen production. Background Technology

[0002] Commercially available water electrolysis hydrogen production systems typically include hydrogen purification systems consisting of two units: deoxygenation and drying. The drying unit usually has three equal-sized drying towers for internal regeneration. Each drying tower is equipped with an independent electric heater, cooler, and water separator. These facilities are primarily used during the regeneration of the adsorbent within the drying tower; they are in standby mode during normal adsorption and drying operations. During the regeneration process, the dried hydrogen gas is heated to approximately 200°C by the electric heater before entering the drying tower for regeneration, carrying away the adsorbed moisture. This moisture forms condensate in the cooler and is then separated by the water separator and discharged from the hydrogen purification system.

[0003] Under normal operating conditions, of the three drying towers, one tower performs adsorption, one tower performs regeneration, and the remaining tower is on standby. Therefore, during normal operation, one adsorption tower, two electric heaters, two coolers, and two water distribution tanks are always in standby mode, only being used during the regeneration of the drying tower, that is, only for 1 / 3 of the system's operating time. This results in low equipment utilization, a large number of devices, a large footprint, and high investment. Utility Model Content

[0004] To address the problems of low equipment utilization and large floor space occupation in existing hydrogen purification systems, this invention provides a hydrogen purification system for water electrolysis hydrogen production. This system includes a deoxygenation unit, a drying unit, and a three-way valve connecting the two units. The drying unit comprises two intermittently operating main drying towers, a pre-drying tower, a heater, a first cooler, and a first water distributor. While one main drying tower is undergoing the drying process, the other main drying tower, pre-drying tower, heater, first cooler, and first water distributor work together to complete the regeneration process. Under normal operating conditions, the pre-drying tower, heater, first cooler, and first water distributor are always operational, with no standby state, resulting in high equipment utilization and a reduced number of units, thus lowering costs and floor space.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A hydrogen purification system for hydrogen production via water electrolysis includes: a deoxygenation unit, a drying unit, and a three-way valve. The deoxygenation unit removes trace amounts of oxygen from the crude hydrogen produced by the water electrolysis unit. The drying unit includes a first drying tower, a second drying tower, a pre-drying tower, a heater, a first cooler, and a first water separator. The first drying tower includes a first deoxygenated hydrogen inlet, a first product hydrogen outlet, a first regenerated gas inlet, and a first regenerated gas outlet. The second drying tower includes a second deoxygenated hydrogen inlet, a second product hydrogen outlet, a second regenerated gas inlet, and a second regenerated gas outlet. The three-way valve includes a deoxygenated hydrogen inlet, a deoxygenated hydrogen outlet, and a regenerated gas outlet. The deoxygenated hydrogen inlet is connected to the deoxygenation unit, and the deoxygenated hydrogen outlet is connected to the first deoxygenated hydrogen inlet. The first product hydrogen outlet and the second product hydrogen outlet are connected to the inlets of the heater, the pre-drying tower, and the first cooler, respectively. The regeneration gas outlet is connected to the inlet of the pre-drying tower, the outlet of the pre-drying tower is connected to the inlet of the heater, and the outlet of the heater is connected to the first regeneration gas inlet and the second regeneration gas inlet, respectively. The first regeneration gas outlet and the second regeneration gas outlet are connected to the inlet of the first cooler, and the first water separator has a first inlet and a first gas outlet. The first inlet is connected to the outlet of the first cooler, and the first gas outlet is connected to the first deoxygenated hydrogen inlet and the second deoxygenated hydrogen inlet, respectively.

[0007] In some embodiments, the deoxygenation unit includes a deoxygenator for removing trace amounts of oxygen from the crude hydrogen produced by the water electrolysis unit, and the outlet of the deoxygenator is connected to the deoxygenated hydrogen inlet.

[0008] In some embodiments, the deoxygenation unit further includes a second cooler disposed on a pipeline between the outlet of the deoxygenator and the deoxygenated hydrogen inlet for cooling the deoxygenated hydrogen.

[0009] In some embodiments, the deoxygenation unit further includes a second water distribution tank, which is disposed on the pipeline between the second cooler and the deoxygenated hydrogen inlet, for the purpose of initially removing liquid water from the deoxygenated hydrogen.

[0010] In some embodiments, the first water separator is further provided with a first liquid outlet, and the second water separator is provided with a second liquid outlet; the hydrogen purification system further includes: a liquid water recovery pipeline, which is connected to the first liquid outlet and the second liquid outlet respectively, for recovering the liquid water accumulated in the first water separator and the second water separator.

[0011] In some embodiments, the hydrogen purification system further includes a controller electrically connected to the three-way valve, the heater, and the first cooler, for controlling the opening and closing of the three-way valve and the operating parameters of the heater and the first cooler.

[0012] In some embodiments, the hydrogen purification system further includes multiple temperature sensors, which are installed on the first drying tower, the second drying tower, the pre-drying tower, and the first cooler, and are electrically connected to the controller.

[0013] In some embodiments, the hydrogen purification system further includes a qualified product hydrogen delivery pipeline, the inlet of which is connected to the first product hydrogen outlet and the second product hydrogen outlet respectively, and the outlet of which is connected to a downstream hydrogen-using device. The qualified product hydrogen delivery pipeline is used to deliver the hydrogen dried by the first drying tower or the second drying tower to the downstream hydrogen-using device.

[0014] In some embodiments, the first drying tower, the second drying tower, and the pre-drying tower are all filled with molecular sieve desiccant.

[0015] In some embodiments, the qualified product hydrogen delivery pipeline is also equipped with a filter, which is used to remove impurities such as catalysts and desiccants carried by the deoxygenated and dried hydrogen.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The hydrogen purification system provided by this utility model includes a deoxygenation unit and a drying unit connected in sequence. The deoxygenation unit removes trace amounts of oxygen from the crude hydrogen produced by the water electrolysis device. The drying unit includes two intermittently operating main drying towers, a pre-drying tower for the regeneration process, a heater, a first cooler, and a first water separator. When one main drying tower is in the drying process, the other main drying tower, pre-drying tower, heater, first cooler, and first water separator cooperate to complete the hot blowing and cold blowing processes in the regeneration process. Compared with existing hydrogen purification systems, this system has fewer devices, a smaller footprint, and a simpler process. Moreover, the pre-drying tower, heater, cooler, and water separator in the drying unit are always in operation during normal system operation, with no standby state, resulting in high equipment utilization and low equipment investment. Furthermore, this system is compatible with alkaline tanks and PEM tanks for water electrolysis, making it widely applicable. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 A schematic diagram of the hydrogen purification system provided by this utility model;

[0020] Figure 2 A schematic diagram of the hydrogen purification system for performing the hot blowing process provided by this utility model;

[0021] Figure 3 A schematic diagram of the hydrogen purification system for performing the cold blowing process provided by this utility model.

[0022] The meanings of the symbols in the attached diagram are as follows:

[0023] 1—Three-way valve; 101—Deoxygenated hydrogen inlet; 102—Deoxygenated hydrogen outlet; 103—Regenerated gas outlet;

[0024] 2—First drying tower; 201—First deoxygenated hydrogen inlet; 202—First regeneration gas inlet; 203—First electrically controlled valve;

[0025] 3—Second drying tower; 301—Second deoxygenated hydrogen inlet; 302—Second regeneration gas inlet; 303—Second electrically controlled valve;

[0026] 4—Pre-drying tower; 5—Heater; 6—First cooler;

[0027] 7—First water distribution tank; 701—First inlet; 702—First gas outlet; 703—First liquid outlet;

[0028] 8—Deaerator; 9—Second cooler; 10—Liquid water recovery pipeline;

[0029] 11—Second water distribution tank; 110—Second inlet; 111—Second gas outlet; 112—Second liquid outlet;

[0030] 12—Qualified product hydrogen transmission pipeline. Detailed Implementation

[0031] The present invention will be further explained in detail below with reference to the accompanying drawings and specific embodiments. However, the following description of the embodiments is only intended to enable those skilled in the art to better understand the principles and essence of the present invention, and does not imply any limitation on the present invention.

[0032] Example 1

[0033] like Figure 1 As shown, this embodiment provides a hydrogen purification system for hydrogen production by water electrolysis, including a deoxygenation unit, a drying unit, and a three-way valve 1.

[0034] The deoxygenation unit is used to remove trace amounts of oxygen from the crude hydrogen produced by the water electrolysis unit.

[0035] The drying unit includes a first drying tower 2, a second drying tower 3, a pre-drying tower 4, a heater 5, a first cooler 6, and a first water distribution tank 7.

[0036] The first drying tower 2 includes a first deoxygenated hydrogen inlet 201, a first product hydrogen outlet, a first regenerated gas inlet 202, and a first regenerated gas outlet.

[0037] The second drying tower 3 includes a second deoxygenated hydrogen inlet 301, a second product hydrogen outlet, a second regenerated gas inlet 302, and a second regenerated gas outlet.

[0038] To more clearly illustrate the regeneration process of the drying tower, this invention features four openings: a set of hydrogen inlet / outlet ports and a set of regeneration gas inlet / outlet ports. However, in actual operation, the gas inlet direction during the drying process is opposite to that during the regeneration process. Therefore, the drying tower only needs two openings. In the first drying tower 2, the first deoxygenated hydrogen inlet 201 corresponds to the first regeneration gas outlet, and the first product hydrogen outlet corresponds to the first regeneration gas inlet 202. In the second drying tower 3, the second deoxygenated hydrogen inlet 301 corresponds to the second regeneration gas outlet, and the second product hydrogen outlet corresponds to the second regeneration gas inlet 302.

[0039] The three-way valve 1 includes a deoxygenated hydrogen inlet 101, a deoxygenated hydrogen outlet 102, and a regeneration gas outlet 103. The deoxygenated hydrogen inlet 101 is connected to the deoxygenation unit, the deoxygenated hydrogen outlet 102 is connected to the first deoxygenated hydrogen inlet 201 and the second deoxygenated hydrogen inlet 301 respectively, and the regeneration gas outlet 103 is connected to the inlet of the pre-drying tower 4.

[0040] After a small amount of oxygen is removed from the crude hydrogen produced by the water electrolysis unit, the deoxygenated hydrogen is split into two streams at the three-way valve 1. One stream enters the first drying tower 2 or the second drying tower 3 from the deoxygenated hydrogen outlet 102 for drying, and the other stream enters the pre-drying tower 4.

[0041] The outlet of the pre-drying tower 4 is connected to the inlet of the heater 5, and the outlet of the heater 5 is connected to the first regeneration gas inlet 202 and the second regeneration gas inlet 302. The first and second regeneration gas outlets are connected to the inlets of the first cooler 6. The deoxygenated hydrogen gas in the pre-drying tower 4 is heated by the heater 5 and then enters the first drying tower 2 (or the second drying tower 3) through the first regeneration gas inlet 202 (or the second regeneration gas inlet 302) to hot-purge the drying tower. It then exits through the first regeneration gas outlet (or the second regeneration gas outlet) and enters the first cooler 6. The heater 5 is preferably an electric heater.

[0042] Furthermore, the outlets of the first and second product hydrogens are sequentially connected to the heater 5, the pre-drying tower 4, and the inlet of the first cooler, respectively. A small amount of deoxygenated hydrogen is introduced into the first drying tower 2 (or the second drying tower 3) after the hot blowing process is completed for the cold blowing process. Then, it is discharged from the outlet of the first product hydrogen (or the outlet of the second product hydrogen) into the heater 5, heated, and then enters the pre-drying tower 4 for hot blowing regeneration. This portion of deoxygenated hydrogen finally enters the first cooler 6 for cooling.

[0043] The first water distribution tank 7 is provided with a first inlet 701, a first gas outlet 702 and a first liquid outlet 703. The first inlet 701 is connected to the outlet of the first cooler 6, and the first gas outlet 702 is connected to the first deoxygenated hydrogen inlet 201 and the second deoxygenated hydrogen inlet 301 respectively.

[0044] The regeneration gas (deoxygenated hydrogen) in the pre-drying tower 4 is heated and then enters the first drying tower 2 or the second drying tower 3, which has already completed the drying process, for regeneration.

[0045] The first drying tower 2 and the second drying tower 3 operate intermittently, meaning that when the first drying tower 2 is in the drying process, the second drying tower 3 is in the regeneration process; and when the first drying tower 2 is in the regeneration process, the second drying tower 3 is in the drying process. The pre-drying tower 4 removes a small amount of moisture from the regeneration gas (deoxygenated hydrogen gas) and is always in operation during the intermittent operation of the first drying tower 2 and the second drying tower 3.

[0046] In some embodiments, the first drying tower 2, the second drying tower 3, and the pre-drying tower 4 are all filled with molecular sieve desiccant. The operating temperatures of the first drying tower 2, the second drying tower 3, and the pre-drying tower 4 are all between 40 and 220°C.

[0047] In some embodiments, the deoxygenation unit includes a deoxygenator 8, the inlet of which is connected to the hydrogen outlet of the water electrolysis device. The crude hydrogen produced by the water electrolysis device enters the deoxygenator 8 to remove trace amounts of oxygen, thereby obtaining deoxygenated hydrogen. The outlet of the deoxygenator 8 is connected to the deoxygenated hydrogen inlet 101.

[0048] Furthermore, the deoxygenation unit also includes a second cooler 9, which is disposed on the pipeline between the outlet of the deoxygenator 8 and the deoxygenated hydrogen inlet 101, for cooling the deoxygenated hydrogen.

[0049] Furthermore, the deoxygenation unit also includes a second water distribution tank 11, which is installed on the pipeline between the second cooler 9 and the deoxygenated hydrogen inlet 101, for the preliminary removal of liquid water from the deoxygenated hydrogen.

[0050] In summary, the deoxygenation unit includes a deoxygenator 8, a second cooler 9, and a second water distribution tank 11, which are connected in sequence by pipelines.

[0051] More specifically, the second water distribution tank 11 includes a second inlet 110, a second gas outlet 111, and a second liquid outlet 112. The second inlet 110 is connected to the outlet of the second cooler 9, and the second gas outlet 111 is connected to the deoxygenated hydrogen inlet 101. The deoxygenated hydrogen flowing out of the deoxygenator 8 is cooled and dehydrated before entering the drying unit.

[0052] Preferably, the hydrogen purification system further includes a liquid water recovery pipeline 10, which is connected to the first liquid outlet 703 and the second liquid outlet 112 respectively, for recovering the liquid water accumulated in the first water distribution tank 7 and the second water distribution tank 11.

[0053] In some embodiments, the hydrogen purification system further includes a qualified product hydrogen delivery pipeline 12, the inlet of which is connected to the first product hydrogen outlet and the second product hydrogen outlet, respectively, and the outlet of which is connected to a downstream hydrogen-using device. The qualified product hydrogen delivery pipeline 12 is used to deliver the hydrogen dried by the first drying tower 2 or the second drying tower 3 to the downstream hydrogen-using device.

[0054] Preferably, the qualified product hydrogen delivery pipeline 12 is also equipped with a filter, which is used to remove impurities such as desiccant carried by the dried hydrogen.

[0055] In some embodiments, the hydrogen purification system also includes a controller electrically connected to the three-way valve 1, heater 5, first cooler 6, and second cooler 9, for controlling the opening and closing of the three-way valve 1 and its opening degree, as well as the opening and closing of the heater 5, first cooler 6, and second cooler 9 and their operating parameters.

[0056] Preferably, the hydrogen purification system further includes multiple temperature sensors. Temperature sensors are installed on the first drying tower 2, the second drying tower 3, the pre-drying tower 4, the first cooler 6, and the second cooler 9. All of these temperature sensors are electrically connected to the controller. The controller can control the operating status of the heater 5, the first cooler 6, and the second cooler 9 based on the temperature parameters collected by the temperature sensors.

[0057] More preferably, the hydrogen purification system is also equipped with multiple electrically controlled valves, which are installed on the connecting pipelines between the individual devices. For example, a first electrically controlled valve 203 is installed on the pipeline between the deoxygenated hydrogen outlet 102 and the first deoxygenated hydrogen inlet 201, and a second electrically controlled valve 303 is installed on the pipeline between the deoxygenated hydrogen outlet 102 and the second deoxygenated hydrogen inlet 30.

[0058] In addition, electrically controlled valves are installed on the pipelines between the outlet of the deoxygenator 8 and the deoxygenated hydrogen inlet 101, the pipeline between the heater 5 and the first regenerated gas inlet 202, the pipeline between the heater 5 and the second regenerated gas inlet 302, the pipeline between the first regenerated gas outlet and the inlet of the first cooler 6, and the pipeline between the second regenerated gas outlet and the inlet of the first cooler 6.

[0059] All of the aforementioned electrically controlled valves are connected to a controller, which contains automatic control software that can control the opening and closing of each electrically controlled valve according to a pre-set operating program.

[0060] Example 2

[0061] Based on Example 1, this example provides the operation flow of the drying unit in the above-mentioned hydrogen purification system, including a drying process and a regeneration process, wherein the regeneration process is divided into a hot blowing process and a cold blowing process.

[0062] Taking the example of the first drying tower 2 being in a drying state and the second drying tower 3 being in a regeneration state, this application provides, for clarity, the following... Figure 2 and Figure 3 The specific processes of hot blowing and cold blowing in the second drying tower 3 will be explained separately.

[0063] The specific process is as follows:

[0064] (1) Hot blowing process of the second drying tower 3

[0065] like Figure 2 As shown, crude hydrogen gas passes through deoxygenator 8, second cooler 9 and second water tank 11 in sequence to obtain saturated deoxygenated hydrogen gas at 40°C. It is then divided into two streams at three-way valve 1. One stream, with about 75% of the deoxygenated hydrogen gas, enters the first drying tower 2 through deoxygenated hydrogen gas outlet 102 for dehydration and drying. The dried hydrogen gas is then sent out through qualified product hydrogen gas transmission pipeline 12 for use by downstream hydrogen-using units.

[0066] Another 25% of the deoxygenated hydrogen is sent from the regeneration gas outlet 103 into the pre-drying tower 4. After the moisture is removed by the pre-drying tower 4, it enters the heater 5 and is heated to 220°C. Then it enters the second drying tower 3 through the second regeneration gas inlet 302. The hot dried hydrogen (regeneration gas) carries away the moisture in the molecular sieve in the second drying tower 3.

[0067] The regenerated gas at 220°C leaves the second drying tower 3 through the second regenerated gas outlet (second deoxygenated hydrogen inlet 301) and enters the first cooler 6. The regenerated gas is cooled to below 40°C and then enters the first water separator 7. Liquid water is separated in the first water separator 7 and discharged through the first liquid outlet 703. The dehydrated regenerated gas is discharged through the first gas outlet 702 and enters the first drying tower 2 through the first deoxygenated hydrogen inlet 201 for the drying process.

[0068] (2) Cold blowing process of the second drying tower 3

[0069] like Figure 3 As shown, after the above-mentioned hot blowing process is completed, there is no moisture in the second drying tower 3. At this time, the cold blowing process is started: 75% of the deoxygenated hydrogen enters the first drying tower 2 for the drying process, and 25% of the deoxygenated hydrogen enters the second drying tower 3 from the second deoxygenated hydrogen inlet 301 (second regeneration gas outlet), and then exits from the second regeneration gas inlet 302 (second product hydrogen outlet) to remove heat from the tower. At the same time, the deoxygenated hydrogen is dried in the second drying tower 3 to obtain dry regenerated hydrogen. After being heated to 220°C by the heater 5, it enters the pre-drying tower 4 for hot blowing regeneration. After removing the moisture in the pre-drying tower 4, it is cooled by the first cooler 6, and the liquid water is separated by the first water separator 7 before being sent to the first drying tower 2 for the drying process.

[0070] Similarly, when the second drying tower 3 is in the drying process, the first drying tower 2 performs the hot blowing process and cold blowing process described above, which will not be repeated here.

[0071] The operating cycle of the two drying towers is as follows: drying and adsorption time 8 hours, regeneration heating time 3 hours, heating and constant temperature time 1 hour, regeneration cooling time 3 hours, and cooling and constant temperature time 1 hour.

[0072] The preferred embodiment of this utility model is provided as an inspiration. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model.

[0073] The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A hydrogen purification system for hydrogen production via water electrolysis, characterized in that, include: The deoxygenation unit, the drying unit, and the three-way valve are provided. The deoxygenation unit is used to remove trace amounts of oxygen from the crude hydrogen gas produced by the water electrolysis device. The drying unit includes a first drying tower, a second drying tower, a pre-drying tower, a heater, a first cooler, and a first water distribution tank; The first drying tower includes a first deoxygenated hydrogen inlet, a first product hydrogen outlet, a first regenerated gas inlet, and a first regenerated gas outlet; The second drying tower includes a second deoxygenated hydrogen inlet, a second product hydrogen outlet, a second regeneration gas inlet, and a second regeneration gas outlet. The three-way valve includes a deoxygenated hydrogen inlet, a deoxygenated hydrogen outlet, and a regeneration gas outlet, and the deoxygenated hydrogen inlet is connected to the deoxygenation unit. The deoxygenated hydrogen outlet is connected to the first deoxygenated hydrogen inlet and the second deoxygenated hydrogen inlet, respectively, and the first product hydrogen outlet and the second product hydrogen outlet are connected in sequence to the inlets of the heater, the pre-drying tower and the first cooler, respectively. The regenerated gas outlet is connected to the inlet of the pre-drying tower, the outlet of the pre-drying tower is connected to the inlet of the heater, and the outlet of the heater is connected to the first regenerated gas inlet and the second regenerated gas inlet, respectively. The first regenerated gas outlet and the second regenerated gas outlet are respectively connected to the inlet of the first cooler; The first water distribution tank is provided with a first inlet and a first gas outlet. The first inlet is connected to the outlet of the first cooler, and the first gas outlet is connected to the first deoxygenated hydrogen gas inlet and the second deoxygenated hydrogen gas inlet, respectively.

2. The hydrogen purification system according to claim 1, characterized in that, The deoxygenation unit includes a deoxygenator, which is used to remove trace amounts of oxygen from the crude hydrogen produced by the water electrolysis device. The outlet of the deoxygenator is connected to the deoxygenated hydrogen inlet.

3. The hydrogen purification system according to claim 2, characterized in that, The deoxygenation unit also includes a second cooler, which is disposed on the pipeline between the outlet of the deoxygenator and the deoxygenated hydrogen inlet, for cooling the deoxygenated hydrogen.

4. The hydrogen purification system according to claim 3, characterized in that, The deoxygenation unit also includes a second water distribution tank, which is installed on the pipeline between the second cooler and the deoxygenated hydrogen inlet, for the purpose of initially removing liquid water from the deoxygenated hydrogen.

5. The hydrogen purification system according to claim 4, characterized in that, The first water distribution tank is also provided with a first liquid outlet, and the second water distribution tank is provided with a second liquid outlet; The hydrogen purification system further includes a liquid water recovery pipeline, which is connected to the first liquid outlet and the second liquid outlet respectively, for recovering the liquid water accumulated in the first water distribution tank and the second water distribution tank.

6. The hydrogen purification system according to claim 1, characterized in that, It also includes a controller, which is electrically connected to the three-way valve, the heater, and the first cooler, for controlling the opening and closing of the three-way valve and the operating parameters of the heater and the first cooler.

7. The hydrogen purification system according to claim 6, characterized in that, It also includes multiple temperature sensors, which are installed on the first drying tower, the second drying tower, the pre-drying tower and the first cooler, and the temperature sensors are electrically connected to the controller.

8. The hydrogen purification system according to claim 1, characterized in that, It also includes a qualified product hydrogen delivery pipeline, the inlet of which is connected to the first product hydrogen outlet and the second product hydrogen outlet respectively, and the outlet of which is connected to a downstream hydrogen-using device. The qualified product hydrogen delivery pipeline is used to deliver the hydrogen dried by the first drying tower or the second drying tower to the downstream hydrogen-using device.

9. The hydrogen purification system according to claim 1, characterized in that, The first drying tower, the second drying tower, and the pre-drying tower are all filled with molecular sieve desiccant.

10. The hydrogen purification system according to claim 8, characterized in that, The qualified product hydrogen delivery pipeline is also equipped with a filter, which is used to remove the catalyst and desiccant carried by the deoxygenated and dried hydrogen.

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