Hydrogen dehydration system and process for producing hydrogen by electrolyzing water and co-producing chemicals

Abstract

The invention discloses a hydrogen dehydration system and process for hydrogen production by electrolysis of water and co-production of chemicals, a top gas outlet of a 1 # gas-water separator is connected with a top gas inlet of a deoxidation tower, a side gas outlet of the deoxidation tower is connected with a tube pass inlet of a 1 # cooler, and a tube pass outlet of the 1 # cooler is connected with an inlet of a 2 # gas-water separator; an outlet of the 2 # gas-water separator is connected with a tube pass inlet of a 2 # cooler through a hydrogen compressor, a tube pass outlet of the 2 # cooler is connected with an inlet of a 3 # gas-water separator sequentially through a tube pass of a product heater and a tube pass of a subcooler, and an outlet of the 3 # gas-water separator is connected with a dehydrating tower system through a program control valve system. Hydrogen is pressurized and cooled through the compressor, a large amount of water in the hydrogen is removed through potential energy of the compressor, and the purposes of saving energy, reducing emission, reducing filling of a dehydrating agent and reducing the production cost are achieved; the process is simple, the operation cost is low, system potential energy and equipment can be fully used, and energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production by electrolysis of water, and in particular to a hydrogen dehydration system and process for co-producing chemicals by electrolysis of water. Background Art

[0002] In the context of low-carbon and zero-carbon energy transformation and development, hydrogen is widely regarded as one of the important contributors to the decarbonization of the world economy. It shows great application potential in energy transformation and development. Hydrogen has the potential to become an energy carrier that integrates different infrastructures. Hydrogen production by water electrolysis plays a vital role in global carbon reduction actions. It not only provides a high-purity, zero-carbon emission method for hydrogen production, but also shows unparalleled environmental advantages compared to traditional fossil fuel hydrogen production methods. It has become a key technology to promote energy transformation and achieve carbon neutrality goals. However, the hydrogen currently produced contains a large amount of water, and how to remove the water from the hydrogen has become a crucial step. Summary of the invention

[0003] The purpose of the present invention is to solve the above technical problems and provide a system and process for dehydrating hydrogen from water to produce hydrogen and co-produce chemicals, which can reduce energy consumption and have low production costs.

[0004] To achieve the above-mentioned purpose, the present invention provides a hydrogen dehydration system for producing hydrogen by electrolysis of water and producing chemicals, comprising a 1# gas-water separator, a deoxidation tower, a 1# cooler, a 2# gas-water separator, a hydrogen compressor, a 2# cooler, a product heater, a supercooler and a 3# gas-water separator, and a dehydration tower system; the top gas outlet of the 1# gas-water separator is connected to the top gas inlet of the deoxidation tower, the side gas outlet of the deoxidation tower is connected to the tube-side inlet of the 1# cooler, the tube-side outlet of the 1# cooler is connected to the inlet of the 2# gas-water separator, the outlet of the 2# gas-water separator is connected to the tube-side inlet of the 2# cooler via the hydrogen compressor, the tube-side outlet of the 2# cooler is connected to the inlet of the 3# gas-water separator via the tube-side of the product heater and the tube-side of the supercooler in turn, the outlet of the 3# gas-water separator is connected to the dehydration tower system via a programmable valve system, and the outlet hydrogen of the dehydration tower system is transported to the shell side of the product heater to recover cooling capacity and then to a downstream device.

[0005] Furthermore, the dehydration tower system includes a dehydration tower A unit, a dehydration tower B unit and a dehydration tower C unit, the dehydration tower A unit includes a 4# gas-water separator, a 3# cooler and an A# dehydration tower, the dehydration tower B unit includes a 5# gas-water separator, a 4# cooler and a B# dehydration tower, and the dehydration tower C unit includes a 6# gas-water separator, a 5# cooler and a C# dehydration tower; one end of the 4# gas-water separator is connected to the outlet of the 3# gas-water separator through one channel of the A# programmable valve, the other end of the 4# gas-water separator is connected to one end of the A# dehydration tower through the pipe side of the 3# cooler, and the other end of the A# dehydration tower is connected to the shell side of the product heater through one channel of the B# programmable valve; one end of the 5# gas-water separator is connected to the outlet of the 3# gas-water separator through one channel of the C# programmable valve The outlet of the water separator is connected, the other end of the 5# gas-water separator is connected to one end of the B# dehydration tower through the pipe line of the 4# cooler, the other end of the B# dehydration tower is connected to the shell side of the product heater through one line of the D# program-controlled valve, one end of the 6# gas-water separator is connected to the outlet of the 3# gas-water separator through one line of the E# program-controlled valve, the other end of the 6# gas-water separator is connected to one end of the C# dehydration tower through the pipe line of the 5# cooler, the other end of the C# dehydration tower is connected to the shell side of the product heater through one line of the F# program-controlled valve; and the other line of the A# program-controlled valve, the other line of the C# program-controlled valve and the other line of the E# program-controlled valve are connected to each other in pairs, and the other line of the B# program-controlled valve, the other line of the D# program-controlled valve and the other line of the F# program-controlled valve are connected to each other in pairs.

[0006] Furthermore, the dehydration tower system removes water from hydrogen to 10 ppm in a sequence of operation, regeneration, adsorption-adsorption, operation, regeneration-regeneration, adsorption, and operation, and sends the hydrogen to a downstream production device.

[0007] Furthermore, the dehydrating agent in the A# dehydration tower, the B# dehydration tower and the C# dehydration tower is regenerated by electric heaters, and the electric heaters use green electricity.

[0008] Furthermore, the deoxidation tower is equipped with a built-in electric heater for heating and deoxidation, and the electric heater uses green electricity.

[0009] Furthermore, the cooling medium of the 1# cooler and the 2# cooler is circulating water.

[0010] Furthermore, the cooling medium of the 3# cooler, 4# cooler and 5# cooler is circulating water.

[0011] Furthermore, the inlet of the hydrogen compressor is also connected to a nitrogen pipeline.

[0012] A dehydration process of the dehydration system as described above is also provided as follows:

[0013] The hydrogen from the water electrolysis hydrogen production device is separated from the water by the 1# gas-water separator and then deoxygenated by the deoxygenation tower. The hydrogen cooled by the 1# cooler is separated from the water by the 2# gas-water separator and then sent to the hydrogen compressor;

[0014] The hydrogen from the 2# gas-water separator enters the hydrogen compressor for pressurization and then is sent out. The hydrogen leaving the hydrogen compressor is cooled by the 2# cooler. The hydrogen leaving the 2# cooler is recovered by the product gas heater, and then cooled by the cooler before entering the 3# gas-water separator to separate water. The hydrogen after water separation is sent to the dehydration tower system. The dehydration tower system removes water from the hydrogen in the sequence of operation, regeneration, adsorption-adsorption, operation, regeneration-regeneration, adsorption, and operation.

[0015] Further, the hydrogen from the 3# gas-water separator enters the dehydration tower A unit through the A# program-controlled valve, passes through the 4# gas-water separator, the 3# cooler and the A# dehydration tower in sequence to absorb water in the hydrogen, and the hydrogen from the A# dehydration tower is partially sent to the D# program-controlled valve of the dehydration tower B unit through the B# program-controlled valve, and the remaining part is sent to the downstream device after the product gas heater recovers the cold, completing the first dehydration process; the hydrogen from the D# program-controlled valve enters the dehydration tower B unit, passes through the B# dehydration tower, the 4# cooler and the 5# gas-water separator in sequence to complete the second The first dehydration process; all the hydrogen entering through the E# programmable valve enters the dehydration tower C unit to complete the third dehydration process; thus completing the operation, regeneration, and adsorption processes; then controlled by the programmable valve, the hydrogen leaving the 3# gas-water separator passes through the dehydration tower B unit, the dehydration tower C unit, and the dehydration tower A unit in turn to complete the adsorption, operation, and regeneration processes; finally, controlled by the programmable valve, the hydrogen leaving the 3# gas-water separator passes through the dehydration tower C unit, the dehydration tower A unit, and the dehydration tower B unit in turn to complete the regeneration, adsorption, and operation processes; thus completing a complete dehydration process.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention fully utilizes the electrolysis of water to produce hydrogen and co-produce chemicals, utilizes a compressor to pressurize and cool the hydrogen, and utilizes the potential energy of the compressor to remove a large amount of water in the hydrogen, thereby achieving the purpose of energy saving and emission reduction, reducing the loading of dehydrating agents and reducing production costs; the system structure of the present invention is simple, the operation is flexible and simple, the preparation investment and operation costs are low, and the system reliability is good; the process of the present invention is simple, the operation cost is low, and the system potential energy and equipment can be fully utilized, energy saving and consumption reduction are reduced, and it is environmentally friendly; the present invention is also applicable to processes requiring hydrogen, such as the electrolysis of water to produce hydrogen and co-produce liquid ammonia, the electrolysis of water to produce hydrogen and co-produce methanol. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart of the hydrogen dehydration system for producing hydrogen by electrolysis of water and co-producing chemicals according to the present invention. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] like Figure 1 The hydrogen dehydration system for producing hydrogen by electrolysis of water and producing chemicals includes a 1# gas-water separator 1, a deoxygenation tower 2, a 1# cooler 3, a 2# gas-water separator 4, a hydrogen compressor 5, a 2# cooler 6, a product heater 21, a supercooler 7 and a 3# gas-water separator 8, and a dehydration tower system. The top gas outlet of the 1# gas-water separator 1 is connected to the top gas inlet of the deoxidation tower 2, the side gas outlet of the deoxidation tower 2 is connected to the tube side inlet of the 1# cooler 3, the tube side outlet of the 1# cooler 3 is connected to the inlet of the 2# gas-water separator 4, the outlet of the 2# gas-water separator 4 is connected to the tube side inlet of the 2# cooler 6 via the hydrogen compressor 5, the tube side outlet of the 2# cooler 6 is connected to the inlet of the 3# gas-water separator 8 via the tube side of the product heater 21 and the tube side of the supercooler 7 in sequence, the outlet of the 3# gas-water separator 8 is connected to the dehydration tower system via the programmable valve system, and the outlet hydrogen of the dehydration tower system is transported to the shell side of the product heater 21 to recover the cooling capacity and then sent to the downstream device.

[0020] The dehydration tower system includes a dehydration tower A unit 9, a dehydration tower B unit 13 and a dehydration tower C unit 17. The dehydration tower A unit includes a 4# gas-water separator 10, a 3# cooler 11 and an A# dehydration tower 12. Similarly, the dehydration tower B unit includes a 5# gas-water separator 14, a 4# cooler 15 and a B# dehydration tower 16. The dehydration tower C unit includes a 6# gas-water separator 18, a 5# cooler 19 and a C# dehydration tower 20. One end of the 4# gas-water separator 10 is connected to the outlet of the 3# gas-water separator 8 through one channel of the A# program-controlled valve 22, and the other end of the 4# gas-water separator 10 is connected to one end of the A# dehydration tower 12 through the pipe side of the 3# cooler 11. The other end of the A# dehydration tower 12 is connected to the shell side of the product heater 21 through one channel of the B# program-controlled valve 23. Similarly, one end of the 5# gas-water separator 14 is connected to the outlet of the 3# gas-water separator 8 through one channel of the C# program-controlled valve 24. The outlet of the water separator 8 is connected, the other end of the 5# gas-water separator 14 is connected to one end of the B# dehydration tower 16 through the pipe line of the 4# cooler 15, and the other end of the B# dehydration tower 16 is connected to the shell side of the product heater 21 through the D# program-controlled valve 25. One end of the 6# gas-water separator 18 is connected to the outlet of the 3# gas-water separator 8 through the E# program-controlled valve 26. The other end of the 6# gas-water separator 18 is connected to one end of the C# dehydration tower 20 through the pipe line of the 5# cooler 19, and the other end of the C# dehydration tower 20 is connected to the shell side of the product heater 21 through the F# program-controlled valve 27; and the other way of the A# program-controlled valve 22, the other way of the C# program-controlled valve 24 and the other way of the E# program-controlled valve 26 are connected to each other in pairs, and the other way of the B# program-controlled valve 23, the other way of the D# program-controlled valve 25 and the other way of the F# program-controlled valve 27 are connected to each other in pairs. The three dehydration tower units remove water from hydrogen to 10 ppm in the sequence of operation, regeneration, adsorption-adsorption, operation, regeneration-regeneration, adsorption, and operation, and send the hydrogen to the downstream production equipment without any loss.

[0021] In this embodiment, the dehydrating agent in the A# dehydration tower 12, the B# dehydration tower 16 and the C# dehydration tower 20 is regenerated by electric heaters, and the electric heaters use green electricity; the deoxygenation tower 2 has a built-in electric heater for heating and deoxygenation, and the electric heater uses green electricity.

[0022] The cooling medium of 1# cooler 3, 2# cooler 6, 3# cooler 11, 4# cooler 15 and 5# cooler 19 is circulating water, which is used to remove moisture in the system, reduce the load of the dehydration tower, and reduce the filling and consumption of the dehydrating agent.

[0023] The cooling medium of the subcooler 7 is selected according to the downstream device. When liquid ammonia is produced, liquid ammonia can be selected.

[0024] The deoxidizer loaded in the deoxidation tower is a precious metal catalyst, and the dehydrating agent loaded in all dehydration towers is a dehydrating agent such as a molecular sieve.

[0025] Depending on the downstream chemicals, the nitrogen pipeline is connected to the inlet of the hydrogen compressor 5.

[0026] Compared with the traditional method of producing hydrogen by electrolysis of water, in which the hydrogen is first deoxygenated, then dehydrated and sent to the compressor for pressurization before being sent to the downstream device, the large amount of water in the hydrogen of the present invention is compressed by the hydrogen compressor, then removed after cooling, and finally sent to the dehydration tower system for dehydration, which can reduce the energy consumption of the device, while reducing the loading amount of the dehydrating agent and reducing the production cost.

[0027] The hydrogen (pressure of 1.5MPaG, temperature of 80-90℃) from the water electrolysis hydrogen production device is separated from water by the 1# gas-water separator 1, then deoxygenated to 1ppm by the deoxygenation tower 2, cooled to 30-40℃ by the 1# cooler 3, and the cooled hydrogen is separated from water by the 2# gas-water separator 4 and sent to the hydrogen compressor 5.

[0028] The hydrogen from the 2# gas-water separator 4 and the nitrogen from the boundary area (depending on the downstream chemicals, whether to set up a nitrogen pipeline) are mixed and then enter the hydrogen compressor 5 for pressurization and then sent out (pressure 2.5-3MPaG). The hydrogen from the hydrogen compressor 5 is cooled to 30-40°C by the 2# cooler 6. The hydrogen from the 2# cooler 6 is cooled to 4-5°C by the product gas heater 21 after the cooling capacity is recovered. After being cooled to 4-5°C by the cooler 7, it enters the 3# gas-water separator 8 to separate water. The hydrogen after water separation is sent to the dehydration tower system. The potential energy of the hydrogen compressor is used to remove water from the hydrogen as much as possible, thereby reducing the loading amount of the dehydrating agent in the dehydration tower and saving production costs.

[0029] The hydrogen from the 3# gas-water separator 8 enters the dehydration tower A unit 9 through the A# program-controlled valve 22, and passes through the 4# gas-water separator 10, the 3# cooler 11 and the A# dehydration tower 9 in sequence to absorb water in the hydrogen. A portion of the hydrogen from the A# dehydration tower 9 is sent to the D# program-controlled valve 25 of the dehydration tower B unit through the B# program-controlled valve 23, and the remaining part is sent to the downstream device after the cooling capacity is recovered by the product gas heater 21, completing the first dehydration process; the hydrogen from the D# program-controlled valve 25 enters the dehydration tower B unit 14, and passes through the B# dehydration tower 16, the 4# cooler 15 and the 5# gas-water separator 14 in sequence to complete the second dehydration process; similarly, the hydrogen from the E# program-controlled valve 23 ... is sent to the D# program-controlled valve 25 of the dehydration tower B unit, and the remaining part is sent to the downstream device after the cooling capacity is recovered by the product gas heater 21, completing the first dehydration process; the hydrogen from the D# program-controlled valve 25 enters the B unit 14 of the dehydration tower, and passes through the B# dehydration tower 16, the 4# cooler 15 and the 5# gas-water separator 14 in sequence to complete the second dehydration process; similarly, the hydrogen from the E# program-controlled valve 23 is sent to the D# program-controlled valve 25 of the dehydration tower B unit 14, and passes through the B# dehydration tower 16, the 4# All the hydrogen from valve 26 enters the dehydration tower C unit 17 to complete the third dehydration process; thus completing the operation, regeneration and adsorption processes; then through the control of the programmable valve, the hydrogen out of the 3# gas-water separator 8 passes through the dehydration tower B unit 14, the dehydration tower C unit 17 and the dehydration tower A unit 9 in turn to complete the adsorption, operation and regeneration processes; finally, through the control of the programmable valve, the hydrogen out of the 3# gas-water separator 8 passes through the dehydration tower C unit 17, the dehydration tower A unit 9 and the dehydration tower B unit 14 in turn to complete the regeneration, adsorption and operation processes; thus completing a complete dehydration process, removing the water in the hydrogen to 10ppm, and sending it to the downstream device, and there is no hydrogen loss at the same time.

[0030] In this embodiment, according to the different production chemicals, the external nitrogen is adjusted or deleted according to the demand. The cooling medium of the cooler can be cooled by air cooler, evaporative cooling and other schemes according to the actual situation of the whole plant, and the cooling temperature can be adjusted accordingly according to the actual situation. The cooling medium of the supercooler can be cooled by water chiller to provide chilled water and other schemes according to the actual situation of the whole plant, and the cooling temperature can be adjusted accordingly according to the actual situation. It is not particularly limited here, relying on the actual situation of the factory, all the water in the hydrogen is removed as much as possible to reduce the amount of water entering the dehydration tower system.

[0031] The dehydration system of the present invention can make full use of the electrolysis of water to co-produce chemicals. When it is necessary to pressurize the hydrogen, the hydrogen produced by the electrolysis of water is first deoxygenated and cooled to separate the water, and then sent to the compressor inlet without dehydration. After being pressurized by the compressor, it is cooled to separate the water and then sent to the dehydration system, thereby reducing the consumption of dehydrating agent and circulating water.

[0032] At 10000Nm 3 / h of hydrogen produced by electrolysis of water (pressure 1.5MPaG, temperature 90°C) as an example, the water content of the hydrogen after deoxygenation and cooling to 40°C is 28.63kg. By adopting the process of the present invention, 27.07kg of water can be removed before entering the dehydration tower system, and only 1.56kg of water is dried and removed to 10ppm by the dehydration tower system and sent to the downstream device. The dehydrating agent is reduced from about 9.5t to about 1.82t, the regeneration power consumption is saved by 290kWh, and the investment in the drying system is reduced from about 3.09 million yuan to about 2.72 million yuan. The economic benefits and energy-saving effects are obvious. At the same time, the size of the corresponding equipment is reduced, which is conducive to layout and reduces the costs of civil engineering and installation.

Claims

1. A system for dehydrating hydrogen from water to produce hydrogen and produce chemicals, characterized by: The invention comprises a 1# gas-water separator (1), a deoxidation tower (2), a 1# cooler (3), a 2# gas-water separator (4), a hydrogen compressor (5), a 2# cooler (6), a product heater (21), a supercooler (7), a 3# gas-water separator (8), and a dehydration tower system; the top gas outlet of the 1# gas-water separator (1) is connected to the top gas inlet of the deoxidation tower (2), the side gas outlet of the deoxidation tower (2) is connected to the tube side inlet of the 1# cooler (3), the tube side outlet of the 1# cooler (3) is connected to the 2# The inlet of the gas-water separator (4) is connected, the outlet of the 2# gas-water separator (4) is connected to the pipe side inlet of the 2# cooler (6) via the hydrogen compressor (5), the pipe side outlet of the 2# cooler (6) is connected to the inlet of the 3# gas-water separator (8) via the pipe side of the product heater (21) and the pipe side of the subcooler (7) in sequence, the outlet of the 3# gas-water separator (8) is connected to the dehydration tower system via the programmable valve system, and the outlet hydrogen of the dehydration tower system is transported to the shell side of the product heater (21) to recover the cooling capacity and then transported to the downstream device.

2. The system for producing hydrogen by electrolysis of water and producing chemical hydrogen by dehydration according to claim 1, characterized in that: The dehydration tower system comprises a dehydration tower A unit (9), a dehydration tower B unit (13) and a dehydration tower C unit (17), wherein the dehydration tower A unit comprises a 4# gas-water separator (10), a 3# cooler (11) and an A# dehydration tower (12), the dehydration tower B unit comprises a 5# gas-water separator (14), a 4# cooler (15) and a B# dehydration tower (16), and the dehydration tower C unit comprises a 6# gas-water separator (18), a 5# cooler (19) and a C# dehydration tower (20); One end of the 4# gas-water separator (10) is connected to the outlet of the 3# gas-water separator (8) through one channel of the A# program-controlled valve (22); the other end of the 4# gas-water separator (10) is connected to one end of the A# dehydration tower (12) through the pipe side of the 3# cooler (11); the other end of the A# dehydration tower (12) is connected to the shell side of the product heater (21) through one channel of the B# program-controlled valve (23); one end of the 5# gas-water separator (14) is connected to the outlet of the 3# gas-water separator (8) through one channel of the C# program-controlled valve (24); The outlet of the water separator (8) is connected to the 5# gas-water separator (14), the other end of the 5# gas-water separator (14) is connected to one end of the B# dehydration tower (16) through the pipe side of the 4# cooler (15), the other end of the B# dehydration tower (16) is connected to the shell side of the product heater (21) through a D# program-controlled valve (25), one end of the 6# gas-water separator (18) is connected to the outlet of the 3# gas-water separator (8) through a E# program-controlled valve (26), the other end of the 6# gas-water separator (18) is connected to the outlet of the 3# gas-water separator (8) through a 5# cooler The pipe side of (19) is connected to one end of the C# dehydration tower (20), and the other end of the C# dehydration tower (20) is connected to the shell side of the product heater (21) through one line of the F# program-controlled valve (27); and the other line of the A# program-controlled valve (22), the other line of the C# program-controlled valve (24) and the other line of the E# program-controlled valve (26) are connected to each other in pairs, and the other line of the B# program-controlled valve (23), the other line of the D# program-controlled valve (25) and the other line of the F# program-controlled valve (27) are connected to each other in pairs.

3. The system for producing hydrogen by electrolysis of water and producing chemical hydrogen by dehydration according to claim 2, characterized in that: The dehydration tower system removes water from hydrogen to 10 ppm in a sequence of operation, regeneration, adsorption-adsorption, operation, regeneration-regeneration, adsorption, and operation, and sends the hydrogen to a downstream production device.

4. The system for producing hydrogen by electrolysis of water and producing chemical hydrogen by dehydration according to claim 2, characterized in that: The dehydrating agent in the A# dehydration tower (12), the B# dehydration tower (16) and the C# dehydration tower (20) is regenerated by electric heaters, and the electric heaters use green electricity.

5. The system for producing hydrogen by electrolysis of water and producing chemical hydrogen by dehydration according to claim 1, characterized in that: The deoxidation tower (2) is equipped with a built-in electric heater for heating and deoxidation, and the electric heater uses green electricity.

6. The system for producing hydrogen by electrolysis of water and producing chemical hydrogen by dehydration according to claim 1, characterized in that: The cooling medium of the 1# cooler (3) and the 2# cooler (6) is circulating water.

7. The system for producing hydrogen by electrolysis of water and producing chemical hydrogen by dehydration according to claim 2, characterized in that: The cooling medium of the 3# cooler (11), the 4# cooler (15) and the 5# cooler (19) is circulating water.

8. The system for producing hydrogen by electrolysis of water and producing chemical hydrogen by dehydration according to claim 1, characterized in that: The inlet of the hydrogen compressor (5) is also connected to a nitrogen pipeline.

9. A dehydration process according to any one of claims 1 to 8, characterized in that: The dehydration process is as follows: The hydrogen from the water electrolysis hydrogen production device is separated from water by the 1# gas-water separator (1) and then deoxygenated by the deoxygenation tower (2). The hydrogen cooled by the 1# cooler (3) is separated from water by the 2# gas-water separator (4) and then sent to the hydrogen compressor (5); The hydrogen from the 2# gas-water separator (4) enters the hydrogen compressor (5) for pressurization and is then sent out. The hydrogen leaving the hydrogen compressor (5) is cooled by the 2# cooler (6). The hydrogen leaving the 2# cooler (6) is cooled by the product gas heater (21) to recover cold, and then is cooled by the cooler (7) and enters the 3# gas-water separator (8) to separate water. The hydrogen after water separation is sent to the dehydration tower system. The dehydration tower system removes water from the hydrogen according to the sequence of operation, regeneration, adsorption-adsorption, operation, regeneration-regeneration, adsorption, and operation.

10. The dehydration process according to claim 9, characterized in that: The hydrogen gas exiting the 3# gas-water separator 8 enters the dehydration tower A unit (9) through the A# program-controlled valve (22), and sequentially passes through the 4# gas-water separator (10), the 3# cooler (11) and the A# dehydration tower (9) to absorb water in the hydrogen gas. A portion of the hydrogen gas exiting the A# dehydration tower (9) is sent to the D# program-controlled valve (25) of the dehydration tower B unit through the B# program-controlled valve (23), and the remaining portion is sent to the downstream device after the cooling energy is recovered by the product gas heater (21), thus completing a dehydration process. The hydrogen gas passing through the D# program-controlled valve (25) enters the dehydration tower B unit (14), and sequentially passes through the B# dehydration tower (16), the 4# cooler (15) and the 5# gas-water separator (1 4) The second dehydration process is completed; the hydrogen gas through the E# program-controlled valve (26) enters the dehydration tower C unit (17) to complete the third dehydration process; thereby completing the operation, regeneration, and adsorption processes; then, through the control of the program-controlled valve, the hydrogen gas exiting the 3# gas-water separator (8) passes through the dehydration tower B unit (14), the dehydration tower C unit (17), and the dehydration tower A unit (9) in sequence to complete the adsorption, operation, and regeneration processes; finally, through the control of the program-controlled valve, the hydrogen gas exiting the 3# gas-water separator (8) passes through the dehydration tower C unit (17), the dehydration tower A unit (9), and the dehydration tower B unit (14) in sequence to complete the regeneration, adsorption, and operation processes; thereby completing a complete dehydration process.

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