Water electrolysis hydrogen production purification system and method

Abstract

The system comprises a gas-water separator, hydrogen coolers, a water collector and a water seal, the gas-water separator, the hydrogen coolers, the water collector and the water seal are connected through a hydrogen pipeline, the gas-water separator is connected with a deaerator, and each hydrogen cooler is connected with a dryer; the lower parts of the deaerator and the dryer are respectively connected with a temperature transmitter; heating components in the deaerator and the dryer are connected with temperature sensors, the power of the heater is adjusted by controlling the temperature of the internal heating components, and film adjusting valves are arranged in front of the hydrogen regeneration pipeline and the finished product hydrogen pipeline, so that the flow of regenerated hydrogen and system hydrogen can be adjusted according to the main hydrogen flow and the system pressure. The operation efficiency of the system can be improved while manpower is saved; a safety valve emptying pipeline is arranged at the joint of the deaerator and the dryer respectively; when the system is abnormal, the hydrogen in the container can be quickly discharged through the safety valve pipeline, so that the safe and reliable operation of the whole purification system is ensured.

Description

Technical Field

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

[0002] Alkaline water electrolysis hydrogen production technology is currently the mainstream hydrogen production technology with a high degree of market maturity. It is a technology that can achieve large-scale and low-cost water electrolysis hydrogen production. Although the hydrogen produced by the alkaline water electrolyzer is separated from the electrolyte and water through a gas-liquid separation device, the purity of the resulting hydrogen still cannot meet subsequent production requirements. In order to further remove impurities in the hydrogen and improve the purity of the hydrogen, a purification device needs to be introduced. At present, the hydrogen production and purification process mostly adopts a three-tower process flow. The deoxygenator and hydrogen dryer are integrated with electric heating and adsorbents or desiccant. During the operation of the purification system, the heater heating temperature is high and the operating power is high, but the utilization rate is insufficient and the system energy consumption is high. Secondly, the hydrogen flow rate of the large-scale hydrogen purification system is large, the system pressure is unstable, and the regeneration gas volume needs to be manually adjusted, which consumes manpower. Summary of the Invention

[0003] The purpose of the present invention is to provide a water electrolysis hydrogen production and purification system, which solves the problems of high energy consumption in the operation of existing hydrogen purification systems and the need for manual adjustment of the regeneration gas volume.

[0004] The present invention also aims to provide a method for purifying hydrogen produced by electrolyzing water.

[0005] The first technical solution adopted by the present invention is: an electrolytic water hydrogen production and purification system, including a gas-water separator, a hydrogen cooler, a water collector and a water seal connected by a hydrogen pipeline, the gas-water separator is connected to the deoxidizer, and each hydrogen cooler is connected to a dryer; the lower part of the deoxidizer and the dryer is respectively connected to a temperature transmitter; the heating components in the deoxidizer and the dryer are connected to a temperature sensor, and the heater power is adjusted by controlling the temperature of the internal heating components; a pneumatic diaphragm regulating valve is connected to the hydrogen pipeline, and a safety valve vent line is respectively provided at the interface of the deoxidizer and the dryer.

[0006] The present invention is also characterized in that: There are multiple air-water separators, including air-water separator A, air-water separator B, air-water separator C, air-water separator D and air-water separator E, and each air-water separator is connected to a water collector respectively.

[0007] There are four hydrogen coolers, including hydrogen cooler A, hydrogen cooler B, hydrogen cooler C and hydrogen cooler D connected in parallel. Hydrogen cooler A is connected to gas-water separator B, hydrogen cooler B is connected to gas-water separator C; hydrogen cooler C is connected to gas-water separator D, and hydrogen cooler D is connected to gas-water separator E. The hydrogen cooler A is connected to the deoxidizer, the hydrogen cooler B is connected to the dryer A, the hydrogen cooler C is connected to the dryer B, and the hydrogen cooler D is connected to the dryer C.

[0008] The water collector is connected to the water seal, and the water seal is provided with a water seal sewage outlet.

[0009] A hydrogen filter is also provided at the end of the hydrogen pipeline, and is used to filter the hydrogen flowing out of the dryer.

[0010] The hydrogen pipeline is equipped with a flow meter and a pressure gauge, which are electrically connected to the control system; the pneumatic diaphragm regulating valve includes a pneumatic diaphragm regulating valve PVⅠ and a pneumatic diaphragm regulating valve PVⅡ, the pneumatic diaphragm regulating valve PVⅠ is arranged at the end of the hydrogen pipeline, and the pneumatic diaphragm regulating valve PVⅡ is arranged on the connecting pipeline between the hydrogen filter and the dryer.

[0011] The second solution adopted by the present invention is a method for producing and purifying hydrogen by electrolysis of water, and the specific operating steps are as follows: The raw hydrogen passes through a gas-water separator to remove liquid water before entering the deaerator. Free water in the raw hydrogen is discharged from the system through a drain valve. In the deaerator, the catalyst reacts with hydrogen and oxygen to form water. The oxygen is removed, and the resulting water is carried out of the deaerator by the hydrogen and enters the hydrogen cooler. The water is condensed in the hydrogen cooler and then enters the gas-water separator with the hydrogen. The liquid water is filtered out in the gas-water separator and then discharged from the system through a drain valve. The hydrogen containing saturated water vapor enters dryer A, dryer B, or dryer C. The gaseous water is adsorbed by molecular sieves in the dryer, and high-purity hydrogen flows out of the dryer. It then passes through a hydrogen filter to remove dust and produce the product hydrogen. Unqualified hydrogen is vented through a bypass. Temperature sensors are connected to the heaters in the deaerator and dryer. A pneumatic diaphragm control valve is connected to the hydrogen pipeline. A safety valve vent line is installed at the interface between the deaerator and dryer.

[0012] The purification process is a three-tower purification process. In one switching cycle, it goes through a total of states: a. Dryer A is working, dryer B is regenerating, and dryer C is adsorbing; b. Dryer B is working, dryer C is regenerating, and dryer A is adsorbing; c. Dryer C is operating, dryer A is regenerating, and dryer B is adsorbing. For each state, the first dryer that the raw hydrogen enters after deoxygenation, cooling, and water filtration is in the operating state, with the gas volume processed being the full gas volume. The dryer is not heated, and the medium is the undehydrated raw hydrogen. The second dryer that it enters is in the regeneration state. The gas volume used for dryer regeneration should be adjusted according to the gas volume processed by hydrogen purification. The dryer is heated first, and when the upper temperature reaches the interlocking value, heating is automatically stopped. The medium is dehydrated dry hydrogen. The third dryer that it enters is in the adsorption state, with the gas volume processed being the regeneration gas volume. The dryer is not heated, and the medium is the regeneration hydrogen. The deoxygenated hydrogen passes through the gas-water separator C and the hydrogen cooler B and enters the lower interface of the dryer A. The saturated water vapor contained in the hydrogen is adsorbed by the desiccant. The dried hydrogen flows out from the upper interface and is divided into two paths. One path flows to the dryer B for drying, and the other path enters the hydrogen filter. The dry regeneration hydrogen flowing out of dryer A enters through the upper interface of dryer B. In dryer B, the hydrogen is first heated up and then flows through the desiccant bed. The moisture adsorbed on the desiccant comes into contact with the hot hydrogen and is desorbed from the desiccant. It then flows out through the lower interface of dryer B along with the hydrogen. Hydrogen for thermal regeneration enters the hydrogen cooler C, where the hydrogen and the water vapor carried away by it are cooled. The condensed water flows into the gas-water separator D along with the hydrogen and is then separated from the hydrogen and discharged out of the system. The cooled regeneration hydrogen enters from the lower interface of dryer C through gas-water separator E and hydrogen cooler D. The saturated water vapor contained in the regeneration hydrogen is adsorbed by the desiccant. The dry hydrogen flows out from the upper interface of dryer C and enters the hydrogen filter, where it merges with the product gas flowing out of dryer A. The dust contained in the hydrogen is filtered out.

[0013] The beneficial effects of the present invention are as follows: the internal heaters of the deoxidizer and the three dryers are all externally connected with temperature display and interlocking instruments. When the temperature of the heater approaches the upper temperature limit, the heater power is reduced, which can achieve the purpose of reducing system energy consumption and preventing the heater from continuously heating and causing the deoxidizer and dryer to overheat. A membrane regulating valve is installed in front of the hydrogen regeneration pipeline and the finished hydrogen pipeline, which can adjust the regenerated hydrogen and system hydrogen flow according to the main hydrogen flow and system pressure, saving manpower while also improving the system operation efficiency. A safety valve venting pipeline is respectively set at the interface of the deoxidizer and the dryer. When an abnormal situation occurs in the system, the hydrogen in the container can be quickly discharged through the safety valve pipeline to ensure the safe and reliable operation of the entire purification system. A liquid level gauge is provided on the water seal, and when the water level reaches the set level, the water is automatically drained, saving manpower and enabling unmanned operation. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a structural diagram of the water electrolysis hydrogen production and purification system of the present invention.

[0014] In the figure, 1. Gas-water separator A, 2. Deoxidizer, 3. Hydrogen cooler A, 4. Gas-water separator B, 5. Gas-water separator C, 6. Hydrogen cooler B, 7. Dryer A, 8. Gas-water separator D, 9. Hydrogen cooler C, 10. Dryer B, 11. Gas-water separator E, 12. Hydrogen cooler D, 13. Dryer C, 14. Hydrogen filter, 15. Water collector, 16. Water seal, 17. Temperature transmitter a, 18. Temperature transmitter b, 19. Temperature transmitter c, 20. Temperature transmitter d, 21. Temperature transmitter e, 22. Temperature transmitter f, 23. Temperature transmitter g, 24. Temperature transmitter h, 25. Pressure gauge, 26. Pneumatic diaphragm control valve PVⅠ, 27. Pneumatic diaphragm control valve PVⅡ, 28. Flow meter, 29. Safety valve A, 30. Safety valve B, 31. Safety valve C, 32. Safety valve D. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0016] Example 1 The embodiment of the present invention provides a water electrolysis hydrogen production and purification system, such as Figure 1 As shown, it includes an air-water separator, a hydrogen cooler, a water collector 15 and a water seal 16 connected by a hydrogen pipeline. The air-water separator is connected to the deoxidizer 2, and each hydrogen cooler is connected to a dryer; the deoxidizer 2 and the lower part of the dryer are respectively connected to a temperature transmitter; the heating components in the deoxidizer and the dryer are connected to a temperature sensor, and the heater power is adjusted by controlling the temperature of the internal heating component. A pneumatic diaphragm regulating valve is connected to the hydrogen pipeline, and a safety valve vent line is respectively set at the interface of the deoxidizer and the dryer.

[0017] There are multiple air-water separators, including air-water separator A1, air-water separator B4, air-water separator C5, air-water separator D8 and air-water separator E11, and each air-water separator is connected to the water collector 15 respectively.

[0018] There are four hydrogen coolers, including hydrogen cooler A3, hydrogen cooler B6, hydrogen cooler C9 and hydrogen cooler D12 connected in parallel. The hydrogen cooler A3 is connected to the gas-water separator B4, and the hydrogen cooler B6 is connected to the gas-water separator C5; the hydrogen cooler C9 is connected to the gas-water separator D8, and the hydrogen cooler D12 is connected to the gas-water separator E11; The hydrogen cooler A3 is connected to the deoxidizer 2, the hydrogen cooler B6 is connected to the dryer A7, the hydrogen cooler C9 is connected to the dryer B10, and the hydrogen cooler D12 is connected to the dryer C13.

[0019] The water collector 15 is connected to the water seal 16, and the water seal 16 is provided with a water seal drain outlet.

[0020] A hydrogen filter 14 is further provided at the end of the hydrogen pipeline, and the hydrogen filter 14 is used to filter the hydrogen flowing out of the dryer.

[0021] The hydrogen pipeline is equipped with a flow meter 28 and a pressure gauge 25, and the flow meter 28 and the pressure gauge 25 are electrically connected to the control system; the pneumatic diaphragm regulating valve includes a pneumatic diaphragm regulating valve PVⅠ26 and a pneumatic diaphragm regulating valve PVⅡ27, the pneumatic diaphragm regulating valve PVⅠ26 is arranged at the end of the hydrogen pipeline, and the pneumatic diaphragm regulating valve PVⅡ27 is arranged on the connecting pipeline between the hydrogen filter 14 and the dryer.

[0022] Example 2 Based on Example 1, The lower portion of deoxidizer 2 is connected to a temperature transmitter a18. The lower temperature of deoxidizer 2 serves as the control temperature for the electric heater. When the lower temperature falls below the set point, the electric heater operates, raising the lower temperature. When the lower temperature exceeds the set point, the heater stops, lowering the lower temperature. By repeatedly starting and stopping the electric heater, the hot hydrogen, at a relatively constant temperature, heats the deoxidizer layer by layer, ultimately ensuring that deoxidizer 2 operates at the set heating temperature. The upper portion of deoxidizer 2 is connected to a temperature transmitter a17. The upper temperature of deoxidizer 2 serves as the electric heater interlock temperature. When the upper temperature exceeds the set point, the electric heater shuts off. This prevents the heater from continuously heating and causing deoxidizer 2 to overheat if a problem with the heater control occurs.

[0023] Reference Figure 1 The lower sections of dryers A7, B10, and C13 are connected to temperature transmitters D20, F22, and H24, respectively. The lower section temperature of the dryer is controlled by the electric heater: when the lower section temperature falls below the setpoint, the heater operates, raising the lower section temperature. When the lower section temperature rises above the setpoint, the heater stops, lowering the lower section temperature. This constant switching of the heaters ensures a nearly constant temperature for the hydrogen and lower packing layers, preventing overheating and desiccant failure. Simultaneously, the desiccant temperature increases layer by layer through the combined effects of heat conduction from the hydrogen and radiation from the heaters. The upper sections of dryers A7, B10, and C13 are connected to temperature transmitters C19, E21, and G23, respectively. The upper section temperature of the dryer is the electric heater interlock temperature. When the upper section temperature exceeds the setpoint, the heater shuts off, ending the dryer's heating and regeneration process and transitioning to the cooling process.

[0024] Reference Figure 1The pressure gauge 25 transmits the system pressure to the control system and compares it with the system pressure setting value. If it is higher than the setting value, the opening of the pneumatic diaphragm regulating valve PVⅠ26 increases and the system pressure decreases; if it is lower than the setting value, the opening of the pneumatic diaphragm regulating valve PVⅠ26 decreases and the system pressure increases, ensuring that the working pressure of the purification system is basically constant and the normal operation of the purification device is guaranteed.

[0025] Reference Figure 1 A flow meter 28 is installed on the hydrogen production pipeline to monitor hydrogen flow changes. The distribution of regeneration gas and product gas is regulated by a pneumatic diaphragm control valve PVⅡ27. Observe the temperature changes in the lower part of the dryer: if the lower temperature rises too quickly, the pneumatic diaphragm control valve PVⅡ27 opens less, increasing the regeneration gas volume. If the lower temperature rises more slowly, the pneumatic diaphragm control valve PVⅡ27 opens more, reducing the regeneration gas volume.

[0026] Reference Figure 1 The deoxidizer 2, dryer A7, dryer B10, and dryer C13 are respectively connected to safety valves A29, B30, C31, and D32. The safety valves are connected to vent pipelines. When an abnormal situation occurs in the system, the hydrogen in the container can be quickly discharged through the safety valve pipeline to ensure the safe and reliable operation of the entire purification system.

[0027] Example 3 The present invention discloses a method for producing and purifying hydrogen by electrolysis, and the specific operating steps are as follows: the raw hydrogen passes through a gas-water separator to remove liquid water and then enters a deoxidizer, and the free water in the raw hydrogen is discharged from the system through a drain valve; in the deoxidizer, hydrogen and oxygen generate water through the action of a catalyst, the oxygen is removed, and the generated water is carried out of the deoxidizer by the hydrogen and enters a hydrogen cooler, and the water is condensed in the hydrogen cooler and then enters the gas-water separator with the hydrogen, the liquid water is filtered out in the gas-water separator, and then discharged from the system through a drain valve, and the hydrogen containing saturated water vapor enters dryer A, dryer B, or dryer C, the gaseous water is adsorbed by a molecular sieve in the dryer, and the high-purity hydrogen flows out of the dryer, and then passes through a hydrogen filter to remove dust to obtain product hydrogen, and unqualified hydrogen is discharged through a bypass. In addition, temperature sensors are connected to the heaters in the deoxidizer and dryer; a pneumatic diaphragm regulating valve is connected to the hydrogen pipeline; and a safety valve vent line is provided at the interface of the deoxidizer and dryer.

[0028] The purification process is a three-tower purification process. In one switching cycle, it goes through three states: a. Dryer A is working, dryer B is regenerating, and dryer C is adsorbing; b. Dryer B is working, dryer C is regenerating, and dryer A is adsorbing; c. Dryer C is working, dryer A is regenerating, and dryer B is adsorbing. For each state, the first dryer that the raw hydrogen enters after deoxygenation, cooling, and water filtration is in working state, the gas volume processed is the full gas volume, the dryer is not heated, and the medium is the undehydrated raw hydrogen. The second dryer it enters is in regeneration state, and the gas volume used for dryer regeneration should be adjusted according to the gas volume processed by hydrogen purification. The dryer is heated first, and when the upper temperature reaches the interlocking value, heating is automatically stopped, and the medium is dehydrated dry hydrogen. The third dryer it enters is in adsorption state, the gas volume processed is the regeneration gas volume, the dryer is not heated, and the medium is hydrogen for regeneration.

[0029] The deoxygenated hydrogen passes through the gas-water separator C and the hydrogen cooler B and enters the lower interface of the dryer A. The saturated water vapor contained in the hydrogen is adsorbed by the desiccant. The dried hydrogen flows out from the upper interface and is divided into two paths. One path flows to the dryer B for drying, and the other path enters the hydrogen filter 14. The dry regeneration hydrogen flowing out of dryer A enters through the upper interface of dryer B. In dryer B, the hydrogen is first heated up and then flows through the desiccant bed. The moisture adsorbed on the desiccant comes into contact with the hot hydrogen and is desorbed from the desiccant. It then flows out through the lower interface of dryer B along with the hydrogen. Hydrogen for thermal regeneration enters the hydrogen cooler C, where the hydrogen and the water vapor carried away by it are cooled. The condensed water flows into the gas-water separator D along with the hydrogen and is then separated from the hydrogen and discharged out of the system. The cooled regeneration hydrogen enters from the lower interface of dryer C through gas-water separator E and hydrogen cooler D. The saturated water vapor contained in the regeneration hydrogen is adsorbed by the desiccant. The dry hydrogen flows out from the upper interface of dryer C and enters the hydrogen filter, where it merges with the product gas flowing out of dryer A. The dust contained in the hydrogen is filtered out.

Claims

1. A water electrolysis hydrogen production and purification system, characterized in that: The invention comprises a gas-water separator, a hydrogen cooler, a water collector (15) and a water seal (16) connected through a hydrogen pipeline, wherein the gas-water separator is connected to a deoxidizer (2), and each hydrogen cooler is connected to a dryer; the deoxidizer (2) and the dryer are respectively connected to temperature transmitters; the heating components in the deoxidizer and the dryer are connected to temperature sensors, and the heater power is adjusted by controlling the temperature of the internal heating components; a pneumatic diaphragm regulating valve is connected to the hydrogen pipeline, and a safety valve venting pipeline is respectively provided at the interface of the deoxidizer and the dryer.

2. The water electrolysis hydrogen production and purification system according to claim 1, characterized in that: There are multiple gas-water separators, including gas-water separator A (1), gas-water separator B (4), gas-water separator C (5), gas-water separator D (8) and gas-water separator E (11), and each gas-water separator is connected to a water collector (15).

3. The water electrolysis hydrogen production and purification system according to claim 1, characterized in that: There are four hydrogen coolers, including hydrogen cooler A (3), hydrogen cooler B (6), hydrogen cooler C (9) and hydrogen cooler D (12) connected in parallel, wherein the hydrogen cooler A (3) is connected to the gas-water separator B (4), the hydrogen cooler B (6) is connected to the gas-water separator C (5); the hydrogen cooler C (9) is connected to the gas-water separator D (8), and the hydrogen cooler D (12) is connected to the gas-water separator E (11); The hydrogen cooler A (3) is connected to the deoxidizer (2), the hydrogen cooler B (6) is connected to the dryer A (7), the hydrogen cooler C (9) is connected to the dryer B (10), and the hydrogen cooler D (12) is connected to the dryer C (13).

4. The water electrolysis hydrogen production and purification system according to claim 1, characterized in that: The water collector (15) is connected to a water seal (16), and the water seal (16) is provided with a liquid level gauge and a water seal drain outlet.

5. The water electrolysis hydrogen production and purification system according to claim 1, characterized in that: A hydrogen filter (14) is also provided at the end of the hydrogen pipeline, and the hydrogen filter (14) is used to filter the hydrogen flowing out of the dryer.

6. The water electrolysis hydrogen production and purification system according to claim 5, characterized in that: The hydrogen pipeline is equipped with a flow meter (28) and a pressure gauge (25), and the flow meter (28) and the pressure gauge (25) are electrically connected to the control system; the pneumatic diaphragm regulating valve includes a pneumatic diaphragm regulating valve PVⅠ (26) and a pneumatic diaphragm regulating valve PVⅡ (27), the pneumatic diaphragm regulating valve PVⅠ (26) is arranged on the hydrogen regeneration pipeline, and the pneumatic diaphragm regulating valve PVⅡ (27) is arranged on the finished hydrogen pipeline between the hydrogen filter (14) and the dryer.

7. A method for producing and purifying hydrogen by electrolysis of water, comprising: using a system for producing and purifying hydrogen by electrolysis of water according to any one of claims 1 to 6, characterized in that: The specific operating steps are as follows: the raw hydrogen passes through the gas-water separator A to remove liquid water and then enters the deoxidizer. In the deoxidizer, hydrogen and oxygen generate water through the action of a catalyst. The oxygen is removed and the generated water is carried out of the deoxidizer by the hydrogen and enters the hydrogen cooler. The water is condensed in the hydrogen cooler and then enters the gas-water separator with the hydrogen. The liquid water is filtered out in the gas-water separator and then discharged from the system through the drain valve. The hydrogen containing saturated water vapor enters the dryer A, dryer B or dryer C. The gaseous water is adsorbed by the molecular sieve in the dryer. The high-purity hydrogen flows out of the dryer and then passes through the hydrogen filter to remove dust to obtain the product hydrogen. The unqualified hydrogen is vented through the bypass. In addition, temperature sensors are connected to the heaters in the deoxidizer and dryer; a pneumatic diaphragm regulating valve is connected to the hydrogen pipeline; and a safety valve vent line is respectively installed at the interface of the deoxidizer and dryer.

8. The method for purifying hydrogen produced by electrolysis of water according to claim 7, wherein the specific hydrogen purification process is a three-tower purification process, and in one switching cycle, there are three states: a. Dryer A is working, dryer B is regenerating, and dryer C is adsorbing; b. Dryer B is working, dryer C is regenerating, and dryer A is adsorbing; c. Dryer C is in operation, dryer A is regenerating, and dryer B is adsorbing. For each state, the first dryer into which the raw hydrogen enters after deoxidation, cooling, and water filtration is in operation, the gas volume processed is the full gas volume, the dryer is not heated, and the medium is the raw hydrogen that has not been dehydrated. The second dryer entering is in the regeneration state. The gas volume used for dryer regeneration should be adjusted according to the gas volume of hydrogen purification treatment. The dryer is heated first. When the upper temperature reaches the interlocking value, the heating is automatically stopped. The medium is dehydrated dry hydrogen. The third dryer entering is in the adsorption state, the processed gas volume is the regeneration gas volume, the dryer is not heated, and the medium is hydrogen for regeneration.

9. The method for producing and purifying hydrogen by electrolysis of water according to claim 8, wherein: The deoxygenated hydrogen passes through the gas-water separator C and the hydrogen cooler B and enters the lower interface of the dryer A. The saturated water vapor contained in the hydrogen is adsorbed by the desiccant, and the dry hydrogen flows out from the upper interface and is divided into two paths. One path flows to the dryer B for drying, and the other path enters the hydrogen filter (14). The dry regeneration hydrogen flowing out of dryer A enters through the upper interface of dryer B. In dryer B, the hydrogen is first heated up and then flows through the desiccant bed. The moisture adsorbed on the desiccant comes into contact with the hot hydrogen and is desorbed from the desiccant. It then flows out through the lower interface of dryer B along with the hydrogen. Hydrogen for thermal regeneration enters the hydrogen cooler C, where the hydrogen and the water vapor carried away by it are cooled. The condensed water flows into the gas-water separator D along with the hydrogen and is then separated from the hydrogen and discharged out of the system. The cooled regeneration hydrogen enters from the lower interface of dryer C through gas-water separator E and hydrogen cooler D. The saturated water vapor contained in the regeneration hydrogen is adsorbed by the desiccant. The dry hydrogen flows out from the upper interface of dryer C and enters the hydrogen filter, where it merges with the product gas flowing out of dryer A. The dust contained in the hydrogen is filtered out.

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