KR20210052041A - Cascade Water Electrolyzer System for Highly Pressurized Hydrogen Production and Highly Pressurized Hydrogen Producing Method - Google Patents

Abstract

The present invention relates to a cascade-type water electrolysis system for producing highly pressurized hydrogen and a method for producing highly pressurized hydrogen using the same, which produces hydrogen by water electrolysis in supplying highly pressured hydrogen to a source of demand, and then supplies the hydrogen under a high pressure of at least 100 bars. The cascade-type method for producing highly pressurized hydrogen in accordance with the present invention comprises the following steps of: producing hydrogen gas by reaction, and transporting the hydrogen gas generated in the reactor to a hydrogen tank by automatic opening of a valve when pressure within the reactor reaches a discharge pressure; and disposing a plurality of reactors in parallel to transport hydrogen to the hydrogen tank from one reactor among the reactors seamlessly or overlappingly as transportation of hydrogen gas is completed from another reactor to the hydrogen tank, thereby increasing 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-type 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 customer. It relates to a method for producing high-pressure hydrogen using.

The current energy system relies heavily on fossil fuels, but fossil fuels have limited reserves and are expected to be depleted in the near future. In addition, global warming is accelerating due _{to carbon dioxide (CO 2} ) generated during the 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 a high energy density, so it can be used as a fuel for automobile power sources and fuel cells for portable electronic devices. Is losing. As a paradigm shift toward an energy economy with hydrogen as the main body, such as a hydrogen fuel cell, is progressing, the demand for hydrogen is increasing.

In addition, hydrogen fuel is expected to be an ideal energy source in the near future as it is a clean fuel that hardly emits environmental pollutants even when directly combusted, and can be used as fuel for high-efficiency fuel cells that convert hydrogen into electricity. .

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

Hydrogen production technology currently under development or under development is a thermochemical method such as by-product hydrogen refining and steam reforming generated in the oil refining, petrochemical, and steel industries, and water by decomposing water using photocatalysts or ultraviolet rays, or by generating electricity with sunlight. It can be classified into a photochemical method that decomposes, a biological method that produces 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, and according to the material and system configuration, PEM (Proton Exchange Membrane), alkaline and solid oxide water electrolysis Can be divided in ways.

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

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

In particular, since the separation membrane has a high gas permeability, if the pressures of the hydrogen electrode and the oxygen electrode are not precisely adjusted, the produced gas crossovers to the counter electrode, resulting in a fatal problem of lowering the purity of the produced hydrogen.

As described above, the water tank pressure of the water electrolysis unit module is about 15 to 30 bar, but in order to be used industrially, it is advantageous in terms of improving 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 each storing hydrogen at low pressure, medium pressure and high pressure, the vehicle to be charged is initially connected with the low pressure tank to supply low pressure hydrogen from the low pressure tank until it reaches an equal pressure with the tank in the vehicle, After that, the medium pressure tank and then the high pressure tank are connected 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 high cost of manufacturing the tank to store hydrogen at a high pressure.

In addition, mechanical compression for compressing hydrogen requires a lot of energy, and causes problems such as wear of moving members, hydrogen embrittlement, contamination by lubricants, and the like.

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

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

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

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

According to an aspect of the present invention for achieving the above object, 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. And, the plurality of reactors are provided in parallel, and when the transfer of hydrogen from one of the plurality of reactors to the hydrogen tank is completed, hydrogen is continuously or overlapped without a blank time to transfer hydrogen from the other reactor to the hydrogen tank. There is provided a cascade-type high-pressure hydrogen production method for increasing 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. Transfer, and a plurality of the reactors in parallel, and the discharge pressure of each reactor is set 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 is completed, the pressure of the hydrogen tank is increased by overlapping the pressure of hydrogen transferred from the reactor to the hydrogen tank by allowing hydrogen to be transferred from the other reactor to the hydrogen tank without a blank time. 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 is automatically opened to convert the hydrogen gas generated in the reactor to hydrogen. It is transferred to a tank, and a plurality of the reactors are provided in parallel, and the discharge pressure of each reactor is set differently from one of the other reactors while hydrogen is transferred from one of the plurality of reactors to the hydrogen tank. By allowing hydrogen to be transferred to the hydrogen tank, there is provided a cascade-type high-pressure hydrogen production method 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 a target pressure, the hydrogen gas stored in the hydrogen tank is supplied to a hydrogen consumer, and the target pressure of the hydrogen tank may be higher than the discharge pressure of the reactor.

Preferably, hydrogen gas is transferred from the hydrogen tank to the hydrogen consumer, and at the same time, hydrogen is transferred from the reactor to the hydrogen tank, so that the pressure of the hydrogen tank can be kept constant.

Preferably, the reactor is a water electrolysis module that generates hydrogen by electrolysis of water, and the power supply for applying power to the water electrolysis module is system power or renewable energy, and Accordingly, the number of drives 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 reaction; A hydrogen tank for storing hydrogen gas discharged from the plurality of reactors; A plurality of valves each opening and closing the connection between the hydrogen tank and the plurality of reactors and automatically opening 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 any one of the reactors. As soon as the transfer of hydrogen gas to the hydrogen tank is completed, the pressure of the hydrogen tank is increased by controlling the operation of the reactor so that the other reactor reaches the discharge pressure to overlap the pressure of hydrogen transferred from the reactor to the hydrogen tank. Including, a cascade-type high-pressure hydrogen production water electrolysis system is provided.

Preferably, the control unit sets the discharge pressures of the plurality of reactors to be the same, but the driving time of each reactor is set 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 the other reactor to the hydrogen tank without a blank time.

Preferably, the control unit sets the discharge pressures of the plurality of reactors differently from each other, while hydrogen is transferred from one of the plurality of reactors to the hydrogen tank, while hydrogen is transferred from the other reactor to the hydrogen tank. By being 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 that generates 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 units of the water electrolysis module in accordance with the power generation load of the renewable energy.

Preferably, the power supply unit is system power, and the control unit may control the number of driving units of the water electrolysis module in accordance with a change in the amount of hydrogen demand of the hydrogen consumer.

The cascade-type high-pressure hydrogen production water electrolysis system and the high-pressure hydrogen production method according to the present invention maintain the stability of the component materials of the water electrolysis component by incorporating an operation technology of a synchronous shifting method with a system configured in a cascade form. High-pressure hydrogen can be produced while maintaining a constant pressure by maximizing the electrochemical compression action of the module.

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

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

1 is a schematic diagram of a cascade-type high-pressure hydrogen manufacturing 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.
3 is a hydrogen production scenario graph showing the hydrogen production pressure by time according to the second operation mode (operating mode II) of the present invention.

In order to fully understand the operational advantages of the present invention and the object achieved by the implementation 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 a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, in adding reference numerals to elements of each drawing, it should be noted that only the same elements are marked with the same numerals as possible, even if they are indicated on different drawings. In addition, the following examples may be modified in various different forms, and the scope of the present invention is not limited to the following examples.

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

The 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) for generating hydrogen and oxygen by electrolyzing water; A power supply unit 200 for applying power to the water 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 electrolysis modules 300 are driven according to the power load of the power supply unit 200 and the hydrogen demand fluctuation of the hydrogen consumer, and connects the hydrogen tank 500 with one or more of the plurality of electrolysis modules 300 It includes; a control unit (not shown) for controlling the opening and closing of the valves (HV, V2, V2, V3).

In addition, a 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 that measures the flow rate of water supplied to the water electrolysis module 300 by the water supply pump 110.

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

In addition, a second gas-liquid separator 600 for gas-liquid separating the fluid discharged from the oxygen electrode of the water electrolysis module 300; A second moisture remover 610 for removing moisture contained in the gaseous oxygen separated by the second gas-liquid separator 600; A second condensation trap 620 for filtering condensate contained in the oxygen gas discharged after moisture is removed by the second moisture remover 610; And an oxygen flow meter 630 that measures 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 electrolytic reaction.

A plurality of water electrolysis modules 300 has a discharge pressure (back pressure) is set. 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 to generate hydrogen gas. Is discharged from the water electrolysis module 300 and stored in the hydrogen tank 500 through a gas-liquid separator 400, a first moisture remover 410, a first condensation trap 420, and a hydrogen flow meter 430.

Hydrogen is stored in the hydrogen tank 500 at a pressure equal to or higher than the discharge pressure of 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. The stability of the module 300 may not be impaired.

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

The liquid water separated from the hydrogen gas in the first gas-liquid separator 400 is a 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 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 can be recovered to the water storage tank 100 side.

In addition, a 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 be further included.

As shown in FIG. 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 new 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 the present embodiment, when the power supply unit 200 uses renewable energy, it is load-followed by power fluctuations, 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 and operated.

In addition, when the power supply unit 200 uses the 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 of the hydrogen usage load of the hydrogen demand source. ) Can be operated due to changes in the number of operations.

The cascade-type high-pressure hydrogen manufacturing 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 consumers, rather than one large-capacity water-electrolysis module, multiple small-capacity water-electrolysis modules are configured in parallel to generate hydrogen by controlling the number of water-electrolysis modules driven according to fluctuations in hydrogen demand It is more effective to do and supply.

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 a 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 the hydrogen gas is filled from the reactor of the water electrolysis module 300 into the hydrogen tank 500, 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, depending on the reactor capacity, a certain time is required.

Accordingly, there is an inevitable 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-type high-pressure hydrogen production method according to the present invention eliminates such blank time, and can continuously and stably supply hydrogen having a high pressure higher than the maximum pressure of hydrogen produced in the water electrolysis module 300 to a hydrogen consumer.

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

Although omitted in the drawings, in this embodiment, the water electrolysis module 300 includes a total of five units water electrolysis module, that is, the first water electrolysis module AWA-1, the second water electrolysis module AWA-2, and A case in which a total of five hydro-electrolysis modules including the third hydro-electrolysis module (AWA-3) is 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 be set to about 30 bar, respectively, at this time, one Assuming that the time until the discharge pressure of the reactor of the water electrolysis module reaches the discharge pressure is about 1/3 hours (refer to the X-axis in Fig. 2), the reactor pressure is from the discharge pressure to the next discharge pressure. Assume that the time of is about 4/3 hours.

According to the first operation mode of the present invention, when starting the operation, a plurality of electrolysis modules are not simultaneously driven, but the first electrolysis module AWA-1 is first driven, and the second electrolysis module AWA- 2) The first water electrolysis module (AWA-1) starts to drive when it 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 to drive, and the third water electrolysis module AWA-3 reaches the discharge pressure. At the time point reached, the fourth water electrolysis module starts to be driven, and when the fourth water electrolysis module reaches the discharge pressure, the fifth water electrolysis module starts to drive.

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 until the first water electrolysis module (AWA-1) reaches the discharge pressure again, the second water electrolysis module (AWA-2), the third water electrolysis module (AWA-3), and the fourth water electrolysis module And the fifth electrolysis module reaches the discharge pressure in a chain, the hydrogen supply from the electrolysis module 300 to the hydrogen tank 500 occurs in a chain.

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 units in operation of the water electrolysis module 300 can be controlled according to the flow rate or flow rate of hydrogen supplied from the hydrogen tank 500 to the hydrogen consumer, that is, the hydrogen demand of the hydrogen consumer. In addition, the timing of operation can 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 consumer, the initial driving time of the plurality of electrolysis modules 300 is set in a synchronous shifting method. , While maintaining the overall pressure of hydrogen generated in the water electrolysis module 300, each unit module is configured in a cascade format, so that hydrogen of the same pressure can be continuously and stably supplied.

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

The second operation mode according to the present embodiment is to open and close 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 points of the valves V1, V2, and V3 are set differently.

In the second operation mode according to the present embodiment, the water electrolysis module 300 includes a total of three units water electrolysis module, that is, a first water electrolysis module AWA-1, a second water electrolysis module AWA-2, and It will be described as an example that includes 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 electrolysis of water in the first water electrolysis module AWA-1, when 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 Adjust the opening time of the second valve (V2) and/or the third valve (V3) 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 into the hydrogen tank 500 from the second water electrolysis module AWA-2, thereby overlapping the pressure to the hydrogen tank 500 (see FIG. 3).

As described above, according to the present embodiment, there is an effect of increasing the pressure of the hydrogen tank 500 to a higher pressure than the reactor discharge pressure by operating each unit water electrolysis module in series.

Referring to FIG. 3, in the second operation mode, the pressure of each unit hydroelectrolysis module is stepped up according to the demand pressure of hydrogen, and through this, compressed high-pressure hydrogen can be supplied from the hydrogen tank 500 to a hydrogen consumer. .

As described above, the embodiments according to the present invention have been looked at, and the fact that the present invention can be embodied in other specific forms without departing from its spirit or scope other than the above-described embodiments is understood by those of ordinary skill in the art. It is self-evident to Therefore, the above-described embodiments should be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description, and may be changed 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: 1st valve V2: 2nd valve V3: 3rd 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)

Hydrogen gas is generated by the reaction, and when the pressure in the reactor reaches the discharge pressure, the valve automatically opens to transfer the hydrogen gas generated in the reactor to the hydrogen tank,
Having a plurality of the reactors in parallel,
When the transfer of hydrogen 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 overlapping without a blank time, thereby increasing the pressure of the hydrogen tank. , Cascade method of high-pressure hydrogen manufacturing 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, and the pressure of the hydrogen tank is increased by overlapping the pressure of hydrogen transferred from the reactor to 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 high-pressure hydrogen production method of increasing the pressure of the hydrogen tank by overlapping the pressure of hydrogen transferred to the tank. The method according to claim 2 or 3,
When the pressure in the hydrogen tank reaches the target pressure, the hydrogen gas stored in the hydrogen tank is supplied to a hydrogen consumer,
The target pressure of the hydrogen tank is higher than the discharge pressure of the reactor, a cascade-type high-pressure hydrogen production method. The method of claim 4,
Hydrogen gas is transferred from the hydrogen tank to the hydrogen consumer, and hydrogen is transferred from the reactor to the hydrogen tank so that the pressure of the hydrogen tank is kept constant. The method according to 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 water electrolysis module,
Grid power or renewable energy,
A cascade-type high-pressure hydrogen manufacturing method for controlling the number of drives of the reactor according to a change in the load of the power supply unit. 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 water separated and removed from the hydrogen gas to the step of supplying the water; including, cascade-type high-pressure hydrogen production method. A plurality of reactors for generating hydrogen gas by reaction;
A hydrogen tank for storing hydrogen gas discharged from the plurality of reactors;
A plurality of valves each opening and closing the connection between the hydrogen tank and the plurality of reactors and automatically opening 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 hydrogen from any one of the reactors. As soon as the transfer of hydrogen gas to the tank is completed, the pressure of the hydrogen tank is increased by controlling the operation of the reactor so that the other reactor reaches the discharge pressure, thereby overlapping the pressure of hydrogen transferred from the reactor to the hydrogen tank. Containing; a cascade-type high-pressure hydrogen production water electrolysis system. The method of claim 8,
The control unit,
The discharge pressures of the plurality of reactors are all set the same, but the driving time of each reactor is set differently with a time difference, so that when the transfer of hydrogen from one of the plurality of reactors to the hydrogen tank is completed, the other without a blank time A water electrolysis system for producing high-pressure hydrogen in a cascade method to allow hydrogen to be transferred from the reactor of the hydrogen tank to the hydrogen tank. The method of claim 8,
The control unit,
The discharge pressures of the plurality of reactors are set differently from each other, but by allowing hydrogen to be transferred from the other reactor to the hydrogen tank while hydrogen is transferred from one of the plurality of reactors to the hydrogen tank, there is no blank time. A cascade-type 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. 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 power supply unit for applying power to the water electrolysis module; further comprising, a cascade-type high-pressure hydrogen manufacturing water electrolysis system. The method of claim 11,
The power supply unit is renewable energy,
The control unit follows the power generation load of the renewable energy and controls the number of driving units of the water electrolysis module, a cascade type high-pressure hydrogen manufacturing water electrolysis system. The method of claim 11,
The power supply unit is system power,
The control unit is a cascade type high-pressure hydrogen production water electrolysis system for controlling the number of drives of the water electrolysis module by following a change in the amount of hydrogen demand of the hydrogen customer.

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