KR102289504B1 - Cascade Water Electrolyzer System for Highly Pressurized Hydrogen Production and Highly Pressurized Hydrogen Producing Method - Google Patents

Abstract

The present invention provides a cascade high-pressure hydrogen production water electrolysis system and the high-pressure hydrogen production water electrolysis system for producing hydrogen by electrolysis of water and supplying high-pressure hydrogen of 100 bar or more in supplying high-pressure hydrogen to a consumer. It relates to a method for producing high-pressure hydrogen using.
In the cascade high-pressure hydrogen production method according to the present invention, hydrogen gas is generated by reaction, and when the pressure in the reactor reaches the discharge pressure, the valve is automatically opened to transfer the hydrogen gas generated in the reactor to the hydrogen tank, A plurality of reactors are provided in parallel, and when hydrogen transfer from one of the plurality of reactors to the hydrogen tank is completed, hydrogen is transferred from the other reactor to the hydrogen tank continuously or overlapped without a blank time. , increase the pressure in the hydrogen tank.

Description

Cascade Water Electrolyzer System for Highly Pressurized Hydrogen Production and Highly Pressurized Hydrogen Producing Method}

The present invention provides a cascade high-pressure hydrogen production water electrolysis system and the high-pressure hydrogen production water electrolysis system for producing hydrogen by electrolysis of water and supplying high-pressure hydrogen of 100 bar or more in supplying high-pressure hydrogen to a consumer. It relates to a method for producing high-pressure hydrogen using.

Currently, the energy system is heavily dependent on fossil fuels, but fossil fuels are expected to be depleted in the near future due to limited reserves. In addition, global warming is accelerating due _{to carbon dioxide (CO 2} ) generated during combustion of fossil fuels. Accordingly, research on the development of environmentally friendly alternative energy is steadily progressing around the world.

Among them, hydrogen energy is environmentally friendly and has high energy density, so it can be used as a fuel for fuel cells for automobile power sources and portable electronic devices. is losing As a paradigm shift toward an energy economy based on hydrogen, such as hydrogen fuel cells, is progressing, the demand for hydrogen is increasing.

In addition, hydrogen fuel is a clean fuel that emits almost no environmental pollutants even when directly burned, and it is expected to be an ideal energy source for the near future in that it can be used as a fuel for a high-efficiency fuel cell that converts hydrogen into electricity. .

In order to efficiently use hydrogen energy, an economical and convenient hydrogen production technology is required.

Hydrogen production technologies that have been developed or are currently under development include thermochemical methods such as by-product hydrogen refining and steam reforming generated in the oil refining, petrochemical, and steel industries, decomposing water using photocatalysts or ultraviolet rays, or generating electricity with sunlight. It can be divided into a photochemical method of decomposing biomass, a biological method of producing hydrogen from biomass, and an electrochemical method.

Among them, the electrochemical method (water electrolysis method) is in the spotlight as an eco-friendly green hydrogen manufacturing process. The water electrolysis method decomposes water into hydrogen and oxygen gases when an external potential is applied. Depending on the material and system configuration, PEM (Proton Exchange Membrane), alkaline and solid oxide water electrolysis can be divided in a way

The pressure of hydrogen produced by the water electrolysis method depends on the characteristics of the electrolyte membrane or membrane material. In short-term operating conditions, up to 200 bar is possible, but in long-term operating conditions, it is usually operated at around 30 bar considering the stability aspect. there is.

In the hydrogen production process of the water electrolysis method, the physical stability of the electrolyte membrane and the separator, which are polymer materials, is reduced under operating conditions in which the pressure of hydrogen produced is 30 bar or more.

In particular, if the pressure between the hydrogen electrode and the oxygen electrode cannot be precisely adjusted because the separation membrane has high gas permeability, the produced gas crosses over to the counter electrode, thereby causing a fatal problem in that the purity of hydrogen produced is reduced.

As such, the manufacturing tank pressure of the water electrolysis unit module is about 15 to 30 bar, but for industrial use, it is advantageous in terms of overall system efficiency and economic efficiency to be manufactured at a high pressure of at least 60 to 80 bar.

A typical gas filling station that supplies gaseous high-pressure hydrogen to automobiles, for example, uses a cascade storage system that divides the stored hydrogen into several separate tanks.

Including three tanks that each store hydrogen at low pressure, medium pressure and high pressure, initially connect the vehicle to be charged with the low pressure tank and supply low pressure hydrogen from the low pressure tank until it reaches the same pressure as the tank in the vehicle, After that, it is connected to the medium pressure tank, and then to the high pressure tank to supply hydrogen.

This method not only requires a lot of energy for storing hydrogen at high pressure in a high pressure tank, but also requires a lot of tank manufacturing cost to store hydrogen at high pressure.

In addition, mechanical compression for compressing hydrogen consumes a lot of energy, and there are problems such as wear of moving members, hydrogen embrittlement, contamination by lubricating oil, and the like.

An electrochemical hydrogen compressor, on the other hand, typically comprises stacks of membrane-electrode assemblies separated by proton exchange membranes. Each assembly includes a cathode, an electrolyte membrane and an anode. Under the potential, hydrogen gas is introduced and reduced to the anode side of the assemblies to produce protons and electrons. Protons travel through the electrolyte membrane to the cathode, where they recombine with electrons to form compressed hydrogen.

These electrochemical hydrogen compressors typically include a stack of multiple seals and membranes that are susceptible to damage by rapid pressure changes. Compressors used in cascade storage systems may experience rapid pressure changes when sequencing from one storage tank to another, for example from a high pressure fuel tank to a low pressure fuel tank.

Rapid pressure changes occur almost simultaneously, reaching thousands of Psi per second, and these rapid pressure changes can cause damage to the electrochemical hydrogen compressor and, in particular, to membrane failure.

Accordingly, the present invention is to solve the above problems, in a hydrogen production process by electrolysis of water, a cascade high-pressure hydrogen production water electrolysis system for producing high-pressure hydrogen of 100 bar or more, and the high-pressure hydrogen production faucet An object of the present invention is to provide a method for producing high-pressure hydrogen using a solution system.

According to one aspect of the present invention for achieving the above object, hydrogen gas is generated by the reaction, and when the pressure in the reactor reaches the discharge pressure, the valve is automatically opened to transfer the hydrogen gas generated in the reactor to the hydrogen tank. A plurality of the reactors are provided in parallel, and when hydrogen transfer from one of the plurality of reactors to the hydrogen tank is completed, hydrogen is continuously or overlapped without a blank time from the other reactor to the hydrogen tank. There is provided a cascade high-pressure hydrogen production method, which increases the pressure of the hydrogen tank by allowing it to be transferred.

According to another aspect of the present invention for achieving the above object, hydrogen gas is generated by the reaction, and when the pressure in the reactor reaches the discharge pressure, the valve is automatically opened to transfer the hydrogen gas generated in the reactor to the hydrogen tank. transport, and a plurality of the reactors are provided in parallel, and the discharge pressure of each reactor is set to be the same, but the driving time of each reactor is set differently with a time difference, and the hydrogen tank from any one of the plurality of reactors When the transfer of hydrogen to the furnace is completed, by allowing hydrogen to be transferred from one reactor to the hydrogen tank without a blank time, the pressure of the hydrogen transferred from the reactor to the hydrogen tank overlaps the pressure of the hydrogen tank to increase the pressure of the hydrogen tank. A method for producing hydrogen is provided.

In addition, according to another aspect of the present invention for achieving the above object, hydrogen gas is generated by the reaction, and when the pressure in the reactor reaches the discharge pressure, the valve automatically opens to convert the hydrogen gas generated in the reactor into hydrogen. transferred to a tank, provided with a plurality of reactors in parallel, and set the discharge pressure of each reactor differently By allowing hydrogen to be transferred to the hydrogen tank, there is provided a cascade method for producing high-pressure hydrogen in which the pressure of the hydrogen tank is increased by overlapping the pressure of hydrogen transferred from the reactor to the hydrogen tank without a blank time.

Preferably, when the pressure of the hydrogen tank reaches the target pressure, the hydrogen gas stored in the hydrogen tank is supplied to a hydrogen demanding destination, and the target pressure of the hydrogen tank may be higher than the discharge pressure of the reactor.

Preferably, hydrogen is transferred from the reactor to the hydrogen tank at the same time as hydrogen gas is transferred from the hydrogen tank to the hydrogen demanding destination, so that the pressure of the hydrogen tank can be maintained constant.

Preferably, the reactor is a water electrolysis module for generating hydrogen by electrolysis of water, and the power supply unit for applying power to the water electrolysis module is system power or renewable energy, and the load fluctuation of the power supply unit is Accordingly, the number of driving of the reactor can be adjusted.

Preferably, supplying water to the water electrolysis module; removing moisture contained in the hydrogen gas transferred from the water electrolysis module to the hydrogen tank; and recycling the water separated and removed from the hydrogen gas to the step of supplying the water.

In addition, according to another aspect of the present invention for achieving the above object, a plurality of reactors for generating hydrogen gas by the reaction; a hydrogen tank for storing the hydrogen gas discharged from the plurality of reactors; a plurality of valves that open and close the connection between the hydrogen tank and the plurality of reactors, respectively, and automatically open when the pressure in the reactor reaches the discharge pressure so that the hydrogen gas is transferred from the reactor to the hydrogen tank; and when hydrogen gas is transferred from any one of the plurality of reactors to the hydrogen tank, the other reactor reaches the discharge pressure so that hydrogen gas is simultaneously transferred to the hydrogen tank or from the one reactor As soon as the transfer of hydrogen gas to the hydrogen tank is completed, the operation of the reactor is controlled so that the other reactor reaches the discharge pressure to overlap the pressure of hydrogen transferred from the reactor to the hydrogen tank to increase the pressure of the hydrogen tank. A cascade high-pressure hydrogen production water electrolysis system is provided, including a control unit.

Preferably, the control unit sets the discharge pressures of the plurality of reactors to be the same, but sets the driving time of each reactor differently with a time difference, and transfers hydrogen from any one of the plurality of reactors to the hydrogen tank When this is completed, hydrogen can be transferred from one reactor to the hydrogen tank without a blank time.

Preferably, the control unit sets the discharge pressure of the plurality of reactors differently from each other, and while hydrogen is transferred from one of the plurality of reactors to the hydrogen tank, hydrogen is transferred from the other reactor to the hydrogen tank. By allowing to be transferred, it is possible to increase the pressure of the hydrogen tank by overlapping the pressure of hydrogen transferred from the reactor to the hydrogen tank without a blank time.

Preferably, the reactor is a water electrolysis module for generating hydrogen by electrolysis of water, and a power supply unit for applying power to the water electrolysis module; may further include.

Preferably, the power supply unit is renewable energy, and the control unit may control the number of driving of the electrolysis module by following the power production load of the renewable energy.

Preferably, the power supply unit may be system power, and the control unit may control the number of driving units of the electrolysis module in response to a change in the hydrogen demand amount of the hydrogen demander.

Cascade high-pressure hydrogen production water electrolysis system and high-pressure hydrogen production method according to the present invention, by grafting the operation technology of the synchronized shifting method to the cascade type system, while maintaining the stability of the water electrolysis component parts and materials, unit By maximizing the electrochemical compression action of the module, high-pressure hydrogen can be produced while maintaining a constant pressure.

In addition, by constructing in a cascade method, it is possible to manufacture high-pressure hydrogen of 100 bar or more from a low capacity to a large capacity without problems with materials such as membranes, and it is possible to effectively respond to power load fluctuations and hydrogen demand fluctuations.

In addition, since the stability of the material is secured, not only can the operation efficiency of the water electrolysis unit module be increased, but also the operation stability and responsiveness are improved, so that low-cost power can be effectively used in connection with renewable energy such as wind power or solar power and the power system. can be used, thus reducing operating costs.

1 is a schematic diagram illustrating a cascade high-pressure hydrogen production water electrolysis system according to an embodiment of the present invention.
2 is a hydrogen production scenario graph showing the hydrogen production pressure by time according to the first operating mode (operating mode I) of the present invention.
Figure 3 is a hydrogen production scenario graph showing the hydrogen production pressure for each hour according to the second operating mode (operating mode II) of the present invention.

In order to fully understand the operational advantages of the present invention and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, in adding reference signs to the elements of each drawing, it should be noted that only the same elements are indicated by the same reference signs as possible even if they are indicated on different drawings. In addition, the following examples may be modified in various other forms, and the scope of the present invention is not limited to the following examples.

Hereinafter, a cascade high-pressure hydrogen production water electrolysis system and a high-pressure hydrogen production method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 .

A cascade-type high-pressure hydrogen production water electrolysis system according to an embodiment of the present invention includes a water storage tank 100 for storing water; a water electrolysis module 300 including one or more unit water electrolysis modules (AWA-1, AWA-2, AWA-3) that electrolyze water to generate hydrogen and oxygen; a power supply unit 200 for applying power to the electrolysis module 300; a hydrogen tank 500 for storing hydrogen gas discharged from the hydrogen electrode of the water electrolysis module 300; an oxygen tank 700 for storing oxygen gas discharged from the oxygen electrode of the water electrolysis module 300; and whether the plurality of water electrolysis modules 300 are driven according to the power load of the power supply unit 200 and changes in the hydrogen demand of the hydrogen demander, and any one or more of the plurality of water electrolysis modules 300 and the hydrogen tank 500 are connected and a control unit (not shown) for controlling the opening and closing of the valves HV, V2, V2, and V3.

In addition, the water supply pump 110 for supplying water from the water storage tank 100 to the water electrolysis module 300; and a first flow meter 120 measuring a flow rate of water supplied to the water electrolysis module 300 by the water supply pump 110 .

In addition, the first gas-liquid separator 400 for gas-liquid separation of the fluid discharged from the hydrogen electrode of the water electrolysis module 300; a first moisture remover 410 for removing moisture contained in the gaseous hydrogen separated in the first gas-liquid separator 400; A first condensation trap 420 for filtering the condensate contained in the hydrogen gas discharged after the moisture is removed from the first moisture eliminator 410; and a hydrogen flow meter 430 for measuring the flow rate of hydrogen gas transferred to the hydrogen tank 500 .

In addition, the second gas-liquid separator 600 for gas-liquid separation of the fluid discharged from the oxygen electrode of the water electrolysis module 300; a second moisture remover 610 for removing moisture contained in oxygen in the gaseous state separated from the second gas-liquid separator 600; a second condensation trap 620 for filtering the condensate contained in the oxygen gas discharged after the moisture is removed from the second moisture eliminator 610; and an oxygen flow meter 630 measuring the flow rate of oxygen gas transferred to the oxygen tank 700 .

Water is supplied to the reactor of the water electrolysis module 300 along the water supply line (WL) connecting the water storage tank 100 and the water electrolysis module 300 , and power is supplied to each reactor by the power supply unit 200 . When applied, water is decomposed into hydrogen and oxygen by an electrolysis reaction.

A plurality of water electrolysis modules 300 are set to a discharge pressure (back pressure). When the pressure of the hydrogen gas generated in each module 300 by the electrolysis reaction reaches the discharge pressure, the first valve (V1), the second valve (V2), and the third valve (V3) are automatically opened and hydrogen gas is discharged from the water electrolysis module 300 and is stored in the hydrogen tank 500 through the gas-liquid separator 400 , the first moisture remover 410 , the first condensation trap 420 , and the hydrogen flow meter 430 .

Hydrogen is stored in the hydrogen tank 500 at a pressure greater than or equal to the discharge pressure of the hydrogen discharged from the water electrolysis module 300 .

In this embodiment, the hydrogen discharge pressure of each of the unit water electrolysis modules (AWA-1, AWA-2, AWA-3) may be about 15 bar to 100 bar, and by configuring it as a cascade, even if hydrogen is discharged at high pressure, The stability of the module 300 may not be impaired.

Therefore, according to this embodiment, it is possible to supply high-pressure hydrogen of about 100 bar or more from the hydrogen tank 500 to the hydrogen demander.

The liquid water separated from the hydrogen gas in the first gas-liquid separator 400 is transferred to the water storage tank 100 along the first water recovery line WL1 connecting the first gas-liquid separator 400 and the water storage tank 100 . ), and the liquid water separated from the oxygen gas in the second gas-liquid separator 600 along the second water recovery line WL2 connecting the second gas-liquid separator 600 and the water storage tank 100 It may be recovered to the water storage tank 100 side.

In addition, the water recovery pump 800 for recovering the water discharged from the first gas-liquid separator 400 and the second gas-liquid separator 600 to the water storage tank 100; may further include.

1 , the first water recovery line WL1 and the second water recovery line WL2 may be integrated into one line upstream of the water recovery pump 800 .

Meanwhile, the power supply unit 200 of the present embodiment may be base power (system power) and renewable energy. Renewable energy may include, for example, wind power generation energy or solar power generation energy with large fluctuations in power generated by external factors.

According to this embodiment, when the power supply unit 200 uses new and renewable energy, the load follows the power fluctuation, and water electrolysis including a plurality of unit water electrolysis modules (AWA-1, AWA-2, AWA-3) The operation quantity of the module 300 may be changed to be operated.

In addition, when the power supply unit 200 uses base power, the water electrolysis module 300 including a plurality of unit water electrolysis modules (AWA-1, AWA-2, AWA-3) according to the change in the hydrogen usage load of the hydrogen demanding destination. ) can be operated by changing the operating quantity.

The cascade high-pressure hydrogen production method according to the present embodiment may be operated in a first operation mode and a second operation mode.

In supplying high-pressure hydrogen to hydrogen demanders, instead of one large-capacity water electrolysis module, multiple small-capacity water electrolysis modules are configured in parallel, and the number of water electrolysis modules driven according to changes in hydrogen demand is adjusted to generate hydrogen and supply is more effective.

In this way, when the reactor pressure of the unit water electrolysis module reaches a preset discharge pressure, for example, about 15 to 30 bar in this embodiment, the hydrogen tank 500 and the plurality of unit water electrolysis modules (AWA) Hydrogen gas by opening the valves (V1, V2, V3) connecting the unit water electrolysis modules (AWA-1, AWA-2, AWA-3) that have reached the discharge pressure among -1, AWA-2, AWA-3) to fill the hydrogen tank 500 .

As hydrogen gas is filled into the hydrogen tank 500 from the reactor of the water electrolysis module 300 , the pressure of the hydrogen tank 500 increases. On the other hand, the pressure of the reactor of the water electrolysis module 300 is lowered. In order to increase the reactor pressure of the water electrolysis module 300 lowered by supplying hydrogen to the hydrogen tank 500 to the discharge pressure again, it takes a certain amount of time, although it depends on the reactor capacity.

Accordingly, there is an unavoidable blank time until hydrogen is produced again in any one of the water electrolysis modules 300 and supplied to the hydrogen tank 500 .

The cascade high-pressure hydrogen production method according to the present invention eliminates such a blank time and can continuously and stably supply hydrogen at a high pressure higher than the maximum pressure of hydrogen produced in the water electrolysis module 300 to a hydrogen demander.

First, in the first operation mode according to the present embodiment, the driving timing of the plurality of electrolysis modules 300 is set differently at the initial stage of operation.

Although omitted from the drawings, in this embodiment, the water electrolysis module 300 includes a total of five unit water electrolysis modules, that is, a first water electrolysis module (AWA-1), a second water electrolysis module (AWA-2) and A case in which a total of five water electrolysis modules including the third water electrolysis module AWA-3 are included (see FIG. 2 ) will be described as an example.

Here, the discharge pressures of the first water electrolysis module AWA-1, the second water electrolysis module AWA-2, and the third water electrolysis module AWA-3 may each be set to about 30 bar, and in this case, one It is assumed that the time until the discharge pressure of the reactor of the water electrolysis module of It is assumed that the time of is about 4/3 of an hour.

According to the first operation mode of the present invention, when starting operation, instead of driving a plurality of water electrolysis modules simultaneously, the first water electrolysis module AWA-1 is first driven, and the second water electrolysis module AWA- 2) starts driving when the first water electrolysis module (AWA-1) reaches the discharge pressure.

Similarly, when the second water electrolysis module (AWA-2) reaches the discharge pressure, the third water electrolysis module (AWA-3) starts driving, and the third water electrolysis module (AWA-3) reaches the discharge pressure. At the time reached, the driving of the fourth water electrolysis module is started, and when the fourth water electrolysis module reaches the discharge pressure, the driving of the fifth water electrolysis module is started.

As shown in the graph of FIG. 2 , as the first water electrolysis module AWA-1 reaches the discharge pressure and hydrogen is supplied to the hydrogen tank 500, the reactor of the first water electrolysis module AWA-1 The pressure is lowered, and the second water electrolysis module (AWA-2), the third water electrolysis module (AWA-3), and the fourth water electrolysis module are until the first water electrolysis module (AWA-1) reaches the discharge pressure again. and the fifth water electrolysis module successively reaches the discharge pressure, so that hydrogen supply from the water electrolysis module 300 to the hydrogen tank 500 occurs in series.

As hydrogen is supplied to the hydrogen tank 500 , the pressure in the hydrogen tank 500 gradually increases, and may rise to about 100 bar.

The number of operating units of the water electrolysis module 300 may be controlled according to the flow rate or flow rate of hydrogen supplied from the hydrogen tank 500 to the hydrogen demanding destination, that is, the hydrogen demand of the hydrogen demanding destination. In addition, the operating time may also be set differently depending on the hydrogen supply conditions.

As described above, according to the first operation mode, in supplying high-pressure hydrogen from the hydrogen tank 500 to the hydrogen demanding destination, the initial driving time of the plurality of water electrolysis modules 300 is set in a synchronized shifting manner. , it is possible to continuously and stably supply hydrogen at the same pressure by configuring each unit module in a cascade format while maintaining a constant pressure of hydrogen generated in the water electrolysis module 300 as a whole.

According to the first operation mode, it is also possible to stably and continuously supply hydrogen at a constant pressure to a hydrogen demander or a separate compressor without providing the hydrogen tank 500 .

The second operation mode according to the present embodiment is an angle of opening and closing the connection between each unit water electrolysis module (AWA-1, AWA-2, AWA-3) and the hydrogen tank 500 among the plurality of water electrolysis modules 300 . It is characterized in that the opening timing of the valves (V1, V2, V3) is set differently.

In the second operation mode according to the present embodiment, the water electrolysis module 300 includes a total of three unit water electrolysis modules, that is, the first water electrolysis module (AWA-1), the second water electrolysis module (AWA-2) and It will be described as an example including the third water electrolysis module (AWA-3).

In addition, the reactor discharge pressure of each unit water electrolysis module (AWA-1, AWA-2, AWA-3) may be set differently.

As hydrogen gas is generated by the electrolysis of water in the first water electrolysis module (AWA-1), the reactor of the first water electrolysis module (AWA-1) reaches the discharge pressure and the first valve (V1) is opened, Hydrogen gas is filled into the hydrogen tank 500 from the reactor of the first water electrolysis module AWA-1.

According to this embodiment, while hydrogen is being transferred from the first water electrolysis module AWA-1 to the hydrogen tank 500, the second water electrolysis module AWA-2 and/or the second water electrolysis module AWA The opening time of the second valve (V2) and/or the third valve (V3) is adjusted so that the reactor of -3) reaches the discharge pressure.

That is, for example, while hydrogen is being filled into the hydrogen tank 500 from the first water electrolysis module AWA-1, the second water electrolysis module AWA-2 and the hydrogen tank 500 are connected. The valve V2 is opened so that hydrogen is also filled from the second water electrolysis module AWA-2 to the hydrogen tank 500, so that the pressure to the hydrogen tank 500 is superimposed (refer to FIG. 3).

As such, according to this embodiment, by operating each unit water electrolysis module in series, there is an effect that the pressure of the hydrogen tank 500 can be increased to a higher pressure than the reactor discharge pressure.

Referring to FIG. 3 , in the second operation mode, the pressure of each water electrolysis module is stepwise increased according to the demand pressure of hydrogen, and through this, compressed high-pressure hydrogen can be supplied from the hydrogen tank 500 to the hydrogen demander. .

As described above, the embodiments according to the present invention have been reviewed, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope of the present invention in addition to the above-described embodiments is recognized by those of ordinary skill in the art. It is self-evident to Therefore, the above-described embodiments are to be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description, but may be modified within the scope of the appended claims and their equivalents.

100: water storage tank
110: water supply pump
120: first flow meter
200: power supply
300: water electrolysis module
400: first gas-liquid separator
410: first moisture remover
420: first condensation trap
430: hydrogen flow meter
500: hydrogen tank
600: second gas-liquid separator
610: second moisture remover
620: second condensation trap
630: oxygen flow meter
700: oxygen tank
800: water recovery pump
V1: first valve V2: second valve V3: third valve
HV: Hydrogen valve OV: Oxygen valve
WL : water supply line
HL: hydrogen line GL1: hydrogen gas line WL1: first water recovery line
OL: Oxygen line GL2: Oxygen gas line WL2: Second water recovery line

Claims (13)

In the high-pressure hydrogen production method in which hydrogen gas is generated by reaction using a reactor, and when the pressure in the reactor reaches the discharge pressure, the valve is automatically opened to transfer the hydrogen gas generated in the reactor to a hydrogen tank,
A plurality of the reactors are provided in parallel,
Compressed hydrogen is generated in the plurality of reactors, and the pressure of the compressed hydrogen is lower than the target pressure of the hydrogen tank as the discharge pressure of the reactor,
The discharge pressure of the plurality of reactors is a preset value,
By setting the time point at which the plurality of reactors reach the discharge pressure differently,
When the hydrogen transfer from any one of the plurality of reactors to the hydrogen tank is completed, hydrogen is transferred from the other reactor to the hydrogen tank continuously or overlapped without a blank time, thereby setting the pressure of the hydrogen tank to the target pressure. To increase to, cascade high-pressure hydrogen production method. The method according to claim 1,
The discharge pressure of each reactor is set the same, but the driving time of each reactor is set differently with a time difference, so that the pressure of hydrogen transferred from the reactor to the hydrogen tank is overlapped to increase the pressure of the hydrogen tank. Hydrogen production method. The method according to claim 1,
By setting the discharge pressure of each of the reactors differently, hydrogen is transferred from the other reactor to the hydrogen tank while hydrogen is transferred from one of the plurality of reactors to the hydrogen tank. A cascade method of producing high-pressure hydrogen by overlapping the pressure of the hydrogen transferred to the tank to increase the pressure of the hydrogen tank. 4. The method of claim 2 or 3,
When the pressure of the hydrogen tank reaches the target pressure, the hydrogen gas stored in the hydrogen tank is supplied to a hydrogen demanding destination, a cascade method for producing high-pressure hydrogen. 5. The method according to claim 4,
A method for producing high-pressure hydrogen in a cascade method, wherein hydrogen gas is transferred from the hydrogen tank to the hydrogen demander and hydrogen is transferred from the reactor to the hydrogen tank to maintain a constant pressure in the hydrogen tank. 4. The method of claim 2 or 3,
The reactor is a water electrolysis module that generates hydrogen by electrolysis of water,
A power supply unit for applying power to the electrolytic module,
grid power or renewable energy,
A method for producing high-pressure hydrogen in a cascade method for controlling the number of drives of the reactor according to a change in the load of the power supply unit. 7. The method of claim 6,
supplying water to the water electrolysis module;
removing moisture contained in the hydrogen gas transferred from the water electrolysis module to the hydrogen tank; and
Recirculating the separated and removed moisture from the hydrogen gas to the step of supplying the water; Containing, cascade high-pressure hydrogen production method. a plurality of reactors generating hydrogen gas by reaction;
a hydrogen tank for storing the hydrogen gas discharged from the plurality of reactors; and
A plurality of valves that respectively open and close the connection between the hydrogen tank and the plurality of reactors, and automatically open when the pressure in the reactor reaches the discharge pressure so that the hydrogen gas is transferred from the reactor to the hydrogen tank; and
Compressed hydrogen is generated in the plurality of reactors, and the pressure of the compressed hydrogen is lower than the target pressure of the hydrogen tank as the discharge pressure of the reactor,
The discharge pressure of the plurality of reactors is a preset value,
The plurality of reactors are set differently at the time of reaching the discharge pressure,
When the hydrogen transfer from any one of the plurality of reactors to the hydrogen tank is completed, hydrogen is transferred from the other reactor to the hydrogen tank continuously or overlapped without a blank time, thereby setting the pressure of the hydrogen tank to the target pressure. A control unit that increases to; 9. The method of claim 8,
The control unit is
The discharge pressures of the plurality of reactors are all set to be the same, but the driving time of each reactor is set differently with a time difference, so that when hydrogen transfer from any one of the plurality of reactors to the hydrogen tank is completed, the other one without a blank time A cascade-type high-pressure hydrogen production water electrolysis system that allows hydrogen to be transferred from the reactor to the hydrogen tank. 9. The method of claim 8,
The control unit is
By setting the discharge pressure of the plurality of reactors differently from each other, while hydrogen is transferred from one of the plurality of reactors to the hydrogen tank, hydrogen is transferred from the other reactor to the hydrogen tank, without a blank time A cascade high-pressure hydrogen production water electrolysis system for increasing the pressure of the hydrogen tank by overlapping the pressure of hydrogen transferred from the reactor to the hydrogen tank. 11. The method according to any one of claims 8 to 10,
The reactor is a water electrolysis module that generates hydrogen by electrolysis of water,
A cascade-type high-pressure hydrogen production water electrolysis system further comprising; a power supply unit for applying power to the water electrolysis module. 12. The method of claim 11,
The power supply unit is a renewable energy,
The control unit, the cascade type high-pressure hydrogen production water electrolysis system for controlling the number of driving of the water electrolysis module in accordance with the power production load of the renewable energy. 12. The method of claim 11,
The power supply unit is system power,
The control unit, the cascade high-pressure hydrogen production water electrolysis system, to control the number of driving of the water electrolysis module in accordance with the change in the hydrogen demand amount of the hydrogen demand destination.

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