JP2005330515A - Water electrolysis system using natural energy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a completely self-helpful water electrolysis system utilizing natural energy, which supplies an electric power supplied from the natural energy to an electrolytic apparatus. <P>SOLUTION: The water electrolysis system comprises: a water electrolysis apparatus 10 for electrolyzing water to generate hydrogen and oxygen; an electric current/voltage control device 80 for controlling the electric current/voltage for driving the water electrolysis apparatus; and a natural energy power generator, for instance, a wind turbine generator 50, which generates electricity with the use of the natural energy. Then, the water electrolysis apparatus 10 can generate hydrogen with the use of the natural energy obtained from the wind turbine generator 50 or the like. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a self-supporting power source for supplying water to a water electrolysis apparatus that produces oxygen and hydrogen by electrolyzing water using a solid polymer electrolyte membrane as a diaphragm. It relates to a water electrolysis system using natural energy.

  Hydrogen gas or oxygen gas is required for fuel cells and hydrogen engines that are attracting attention as clean systems. Gas generators (equipment using solid polymer electrolyte membrane) as water electrolyzers that produce hydrogen gas and oxygen gas by electrolysis of water (hereinafter referred to as “water electrolysis”) are relatively easy and non-polluting It is possible to produce hydrogen gas and oxygen gas. A gas generation system can be obtained by combining the gas generator and some power generation equipment.

  However, the power source for water electrolysis in the prior art often uses grid power from an electric power company. When hydrogen gas and oxygen gas are produced by water electrolysis using this electric power, and power is generated by a fuel cell using these gases, the overall system efficiency is lowered. There is also a method of using low-cost power such as nighttime power, but in that case, the usage time is limited to midnight and there is a problem in terms of convenience. For this reason, a low-cost and highly efficient power supply source is desired. In addition, a power supply source with less time constraints is desired.

  For this reason, conventionally, for example, a hydrogen replenishment system that supplies hydrogen to a specific number of vehicles that run using hydrogen as fuel, a hydrogen filling container that is detachably attached to the vehicle and supplies hydrogen to the vehicle, A water electrolysis apparatus for generating hydrogen to be filled in a hydrogen filling container, a power supply means for supplying power from commercial power to supply power to the water electrolysis apparatus, a power cost of the commercial power, and the hydrogen filling container There has been proposed a hydrogen replenishment system including a controller that controls the operation of the water electrolysis apparatus in accordance with the amount of hydrogen charged to the water (Patent Document 1).

JP 2002-184417 A

  By the way, in order to use grid power for electrolysis of water, it is premised that grid power reaches the water electrolysis device. For example, hydrogen can be effectively used in power isolated areas such as remote islands and mountainous areas. There is a problem that it is not possible. Patent Document 1 proposes photovoltaic power generation as natural energy, but it is used as an alternative to system power, and the emergence of a completely self-supporting hydrogen supply facility using natural energy is desired.

Further, the current hydrogen source of the fuel cell is obtained by reforming from fossil fuel, but there is a problem that CO ₂ is emitted at this time. Due to the global problem of CO ₂ reduction, the emergence of an efficient system capable of obtaining hydrogen without generating any CO ₂ is desired.

  In view of the above problems, an object of the present invention is to provide a natural energy-utilizing water electrolysis system that is completely self-supported by supplying electric power to be supplied to a water electrolysis device from natural energy.

  The first invention of the present invention for solving the above-mentioned problems is a water electrolysis device that electrolyzes water to generate hydrogen and oxygen, and a current / voltage that controls a current / voltage for driving the water electrolysis device. A natural energy utilization water electrolysis system comprising a control device and a natural energy power generation device that obtains electricity by natural energy.

  A second invention is the water electrolysis system using natural energy according to the first invention, further comprising a secondary battery for storing electricity from the natural energy generator.

  According to a third invention, in the first or second invention, the natural energy power generation device is any one of a wind power generation device, a solar power generation device, a hydroelectric power generation device, a wave power generation device, a geothermal power generation device, and an ocean temperature difference power generation device. Or it is in the water electrolysis system using natural energy characterized by being a combination of these.

  A fourth invention is the water electrolysis system using natural energy according to any one of the first to third inventions, wherein the water supplied to the water electrolysis device is heated by a solar water heater. .

  A fifth invention is the invention according to any one of the first to fourth inventions, wherein the water electrolysis device is provided in the container body, and purifies from the top of the container body, the purification layer for purifying the circulating water circulating. A partition plate that separates the interior of the container body into a first chamber and a second chamber; a water electrolysis stack that is provided outside the container body and generates hydrogen and oxygen by electrolyzing circulating water; and A water supply pipe for supplying purified water to the water electrolysis stack, and a first hydrogen / water / two-layer flow entrained by the water from the water electrolysis stack to the first chamber of the container body. A feed pipe, a second feed pipe for feeding an oxygen / water bilayer flow entrained in the circulating water from the water electrolysis stack to the second chamber of the container body, and the first chamber. A hydrogen discharge section for discharging hydrogen and an oxygen discharge section for discharging oxygen from the second chamber; Bei was made by, while purifying circulating water supplied to the water electrolysis stack in natural energy water electrolysis system characterized by being natural circulation.

  A sixth invention is the water electrolysis system using natural energy according to the fifth invention, wherein the container body is a pressure vessel.

  According to a seventh invention, in any one of the first to fourth inventions, the water electrolysis device is provided in the pressure vessel main body, and purifies the circulating water that circulates, and the top of the pressure vessel main body. Water that hangs down and separates the inside of the container body into a first chamber and a second chamber, and water that is provided in the lower part of the body of the pressure vessel and generates hydrogen and oxygen by electrolyzing the circulated purified water. An electrolysis stack, a water supply section for supplying purified water to the water electrolysis stack, and a hydrogen / water / two-layer flow accompanying the circulation water from the water electrolysis stack to the first chamber of the container body. A first feed pipe for feeding, a second feed pipe for feeding an oxygen / water bilayer flow entrained in the circulating water from the water electrolysis stack to a second chamber of the container body, and A hydrogen discharge section for discharging hydrogen from the first chamber, and oxygen from the second chamber. To become comprises a oxygen discharge portion, while purifying circulating water supplied to the water electrolysis stack in natural energy water electrolysis system characterized by being natural circulation.

According to the present invention, hydrogen can be supplied in a self-contained manner using natural energy.
As a result, hydrogen and oxygen can always be supplied stably even in an electrically isolated area where there is no system power supply such as a mountainous area or a remote island.

  Moreover, natural energy can supply hydrogen stably by using any one of a wind power generator, a solar power generator, a hydroelectric generator, a wave power generator, a geothermal power generator, and an ocean temperature difference power generator. Moreover, it can contribute to the thermal independence of a water electrolysis apparatus by heating supply water using a solar water heater.

  In addition, since the water electrolyzer is supplied to the water electrolysis stack by natural circulation within the container body, a conventional pump for circulating the circulating water is not required, the apparatus is simplified and the unit price of hydrogen is reduced. be able to. In addition, since the hydrogen-entrained water and oxygen-entrained water are purified by the purification layer and then integrated, it is not necessary to supply surplus water using a conventional pump, and the facility can be made compact. Unit price can be reduced. In addition, by disposing the water electrolysis stack in the container body as a pressure vessel, it is possible to achieve an ultra-high pressure of, for example, 300 at least, eliminating the need for a compressor or the like when filling the hydrogen storage tank with hydrogen, further reducing the hydrogen unit price. can do.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

  An outline of a water electrolysis system using natural energy according to an embodiment of the present invention is shown in FIG. As shown in FIG. 1, a water electrolysis system using natural energy according to the present embodiment controls a water electrolysis device 10 that electrolyzes water to generate hydrogen and oxygen, and a current and voltage that drives the water electrolysis device. And a natural energy power generation device such as a wind power generation device 50 that obtains electricity by natural energy.

  According to the present embodiment, it is possible to generate hydrogen by using the wind power generation device 50 as natural energy and supplying the power obtained by the wind power generation to the water electrolysis device. Therefore, hydrogen can be supplied in a self-contained manner without using a system power source by an electric power company.

  As a result, hydrogen and oxygen can always be supplied stably even in places where there is no system power supply such as a mountainous area or a remote island.

  Here, as a natural energy power generation device in the present invention, in addition to the wind power generation device described above, a solar power generation device 60 using sunlight 61 as shown in FIG. 1 can be exemplified. Since this solar power generation device 61 cannot supply electricity at night, for example, it is stored in a power storage device such as a secondary battery 70 in the daytime, and a constant current is supplied to the water electrolysis device 10 using a current / voltage control device 80. The voltage and current are controlled.

  Moreover, as natural energy, other than the wind power generator and the solar power generator described above, for example, a hydroelectric power generator, a wave power generator, a geothermal power generator, and an ocean temperature difference power generator can be exemplified.

  In addition, the above-described natural energy device can be used alone or in combination depending on the geographical factors of installation, and supplies hydrogen stably by using natural energy efficiently by combining these appropriately. Can do.

  In addition, as shown in FIG. 1, the supply water is heated using a solar water heater 90 and supplied to the water electrolysis device 10 through the supply pipe 91, thereby contributing to thermal independence in the water electrolysis device 10. Can do.

  In addition, when the circulating water is heated to a predetermined temperature or more due to Joule heat generated by hydrogen generation in the water electrolysis device, the water from the outside is separately supplied and the circulating water is discharged symbiotically. Can be solved.

  As a result, a completely self-supporting hydrogen supply system using natural energy can be provided in mountainous areas and isolated islands such as remote islands where there is no grid power by the power company.

Since the present invention uses natural energy to generate hydrogen and oxygen from water, the current fuel cell hydrogen source has no CO ₂ emissions as generated when reforming from fossil fuels, This is a hydrogen supply system using clean energy in the original sense, and infrastructure such as a hydrogen station can be improved using this system. As a result, stable supply can be achieved even in an electrically isolated area by using clean equipment, for example, a fuel cell using hydrogen.

  In addition, the present invention is particularly effective in an area where electricity is isolated, but does not prevent the combined use with a system power source from an electric power company. In particular, more efficient supply of hydrogen can be achieved by efficiently using midnight power to store electricity.

  Here, the water electrolysis apparatus applied to this invention can be used if it is a well-known water electrolysis apparatus, and is not specifically limited.

Furthermore, a water electrolysis apparatus that can be particularly preferably applied to a water electrolysis system that efficiently utilizes natural energy will be described with reference to FIGS.
2 is a schematic perspective view showing a water electrolysis apparatus according to the present embodiment, FIG. 3 is a longitudinal sectional view thereof (sectional view taken along line AA in FIG. 5), FIG. 4 is a front view thereof, and FIG. 4 is a schematic view showing an ultrahigh pressure type water electrolysis apparatus.
As shown in these drawings, a water electrolysis apparatus 10 according to the present embodiment is provided with a predetermined interval from a lower end surface in a container body 11, and a purification layer 13 for purifying circulating water 12 that circulates, and a container A partition plate 25 that hangs down from the top portion 11a of the main body 11 and separates the inside of the container main body 11 into a first chamber 14-1 and a second chamber 14-2, and is provided outside the container main body 11 for circulating water. A water electrolysis stack 15 that generates hydrogen and oxygen by electrolysis, a water supply pipe 17 that supplies purified water 16 to the water electrolysis stack 15, and hydrogen / Oxygen / water entrained by circulating water from the first feeding pipe 19-1 for feeding the water / two-layer flow 18-1 to the first chamber 14-1 of the container body 11 and the water electrolysis stack 15. The two-layer flow 18-2 is transferred to the second chamber 14-2 of the container body 11 A second feed pipe 19-2 for feeding, a hydrogen discharger 20 for discharging hydrogen from the first chamber 14-1, and an oxygen discharger 21 for discharging oxygen from the second chamber 14-2. Thus, the circulating water 12 supplied to the water electrolysis stack 11 is naturally circulated while purifying it.
In FIG. 3, reference numeral 30 denotes a heat insulating material, and 31 denotes a heating unit such as a heater.

  Here, in this embodiment, the inside of the container body is separated into the first chamber 14-1 and the second chamber 14-2 by the partition plate 25 that partitions the container body 11, but the partition plate 25 is It is desirable to contact at least the purification layer. This is because it is necessary to prevent contact between hydrogen generated in the first chamber 14-1 and oxygen generated in the second chamber 14-2. Therefore, it is more desirable that the partition plate hangs down to the lower part of the purification layer 13.

  Moreover, it connects with the 1st supply pipe | tube 19-1 which supplies hydrogen / water and the two-layer flow 18-1 to the 1st chamber 14-1 so that the generated hydrogen and oxygen may not contact. The oxygen generation pipe 19-1 connected to the hydrogen supply pipe 19-1a and the second feed pipe 19-2 for feeding the oxygen / water / two-layer flow 18-2 to the second chamber 14-2. For example, it may be covered with ceramics, a sintered material or the like so as to surround the periphery of the outlet portion of 2a to prevent the movement of hydrogen or oxygen downward. In this case, since hydrogen and oxygen do not cross each other, the partition plate 25 may not reach the purification layer 13.

  Further, the pressure in each room is measured by a pressure gauge (not shown) so that the water surface in the container body is constant, and the pressure is adjusted so that each room has a uniform pressure.

  For this reason, a hydrogen gas discharge pipe 20a is connected to the hydrogen discharge portion 20 of the hydrogen gas, and is adjusted as appropriate by opening and closing the valve 20b. Similarly, an oxygen gas discharge pipe 21a is connected to the oxygen gas discharge section 20 and is adjusted appropriately by opening and closing the valve 21b.

  Also, as shown in FIG. 3, since water is consumed by water electrolysis, a water level meter 43 is installed in the container body 11, and a predetermined amount of water is supplied 42 via a water supply pipe by a ball tap 41 or the like. I am doing so.

  In the present embodiment, the inside of the container main body 11 is pressurized, but the present invention is not limited to this and may be normal pressure. In addition, when installing an electrolytic stack outside, it is preferable to set it to several to several tens of pressures from the sealing property of a cell. Thereby, high-pressure hydrogen gas can be obtained.

In addition, as shown in FIG. 6, the container main body may be a pressure vessel 71 and may be set to several to 800 atm.
In this case, the electrolytic stack 15 supported by the support portion 15 a in the container main body 71 is installed below the purification layer 13. And the oxygen side circulating water and the hydrogen side circulating water are supplied to each water supply port provided below the electrolytic stack 15. Further, by supplying the circulating water so as to cross, it is possible to correct the deviation of heat inside the electrolytic stack 15 and to equalize the temperature.

  As a result, since high-pressure hydrogen can be obtained, it can be supplied as it is, for example, to a fuel tank such as a hydrogen automobile without using a compressor or the like. Therefore, since the water electrolysis stack 15 is disposed inside the high pressure vessel and the electrolyzed water supplied to the water electrolysis stack 15 can be naturally circulated, it is possible to achieve compactness and further improve the in-house efficiency.

  Here, the purification layer 13 of the present embodiment is made of, for example, an ion exchange resin having a diameter of about several millimeters. In order to fill the ion exchange resin, a support member 13a having a net or pores is provided at a predetermined distance from the lower end surface of the container body 11, and the support member 13a is filled with the ion exchange resin. The filling amount may be an amount that efficiently purifies the circulating water, and the thickness leads to the pressure loss of the circulating water described later, and therefore may be a predetermined thickness that balances the pressure loss.

  When circulating water passes through, for example, an ion exchange resin or the like of the purification layer 13, impurities in the circulating water can be removed, and water electrolysis efficiency can be improved. In other words, if the supplied external water or impurities generated by water electrolysis adhere to the surface of the membrane during water electrolysis, the electrolysis efficiency in the membrane is reduced by passing through the purification layer 13. Can be resolved.

  Here, as the ion exchange resin, for example, “Dowex * Marathon * C600” (trade name: manufactured by Dow Chemical Japan Co., Ltd.), “Diaion TSA1200” (trade name: manufactured by Mitsubishi Chemical Corporation), or “Diaion” SAT1200 & SMT1200 "(trade name: manufactured by Mitsubishi Chemical Corporation) can be exemplified, but the present invention is not limited to these.

Further, as shown in FIG. 3, in this embodiment, the temperature around the container body 11 is kept warm by a heat insulating material 30. This prevents the heat generated by water electrolysis (almost of the input power that is not used for water electrolysis from being converted into heat) from being released to the outside, thereby achieving complete thermal independence. Because. As a result, the circulating water can be circulated stably at a temperature of about 80 ° C. for a long period of time.
In addition, when the temperature of circulating water becomes higher than predetermined temperature by heat_generation | fever, what is necessary is just to adjust temperature by adjusting the amount of water supply from the outside.

  In the present embodiment, the heating unit 31 is provided on the lower side of the container body 11. For example, a heater or the like can be used as the heating unit 31, but a boiler using oxygen and hydrogen generated by the apparatus as fuel sources may be used.

  Here, if the heating part 31 is used at the time of starting, thermal independence can be aimed at by Joule heat at the time of electrolysis after that.

In this embodiment, when the purified circulating water 16 is supplied to the water electrolysis stack 15, it is supplied to both the oxygen side and the hydrogen side. However, the present invention is not limited to this. It is sufficient to supply at least to the water supply path side on the oxygen side.
In the case of using only the oxygen supply side, the amount of water to be circulated can be reduced only on the oxygen side, the diameter of the container body can be reduced, and the size can be reduced.

  Also, the supply method is such that the hydrogen side water supply port and the oxygen side water supply port are connected to the outlet of the hydrogen / water / two-layer flow 18-1 as the gas outlet and the oxygen / water / two-layer flow 18-2. The outlet is crossed and the flow of the circulating water passing through the water electrolysis stack 15 is crossed so as to equalize the temperature.

  Further, in the cells constituting the water electrolysis stack 15, the pressure loss of the circulating water does not decrease, and a power supply body that also serves as a water supply path for supplying water having a good contact rate with the solid polymer membrane is used. ing.

This cell is interposed between a pair of separators, a solid polymer electrolyte membrane provided between the separators, the solid electrolyte membrane and the separator, and the flow resistance of water is small (pressure loss is small) And it is comprised from the electric power feeding body with small electrical resistance. In the present embodiment, the mesh of the power supply is increased in order from the solid polymer film side.
In this embodiment, the function of inclining is exhibited by the size of the mesh openings, but the present invention is not limited to this, and is assumed to have both water permeability and electrical characteristics of the circulating water. That's fine. The electrolytic stack 15 is formed by laminating a plurality of the above-described cells, and the number of laminated layers is appropriately set according to the capacity and size.

Here, the effect | action which circulating water circulates naturally is demonstrated.
When passing through the purification layer 13, a pressure loss of water occurs. When this flow rate is large, the pressure loss increases. Moreover, pressure loss also occurs in the electrolytic stack 15, and the pressure loss increases as the flow rate increases. On the other hand, inside the electrolytic stack 15 and the supply pipe, if the gas generation is constant at a constant current, the void rate is decreased and the circulation force is decreased when the circulation flow rate is large. Thus, there is an appropriate amount to balance.

In this example, the following design conditions were used.
The pressure (P) in the container body was 7 ata, the current density (I) was 1 A / cm ² , and the temperature (T) was 80 ° C. Further, the flow rate of the circulating water on the oxygen side in the purification layer 13 was set to 0.5 L / min / cell.

As a result of the test, the pressure loss (ΔPf) in the purification layer on the oxygen side is 77.5 (mmH ₂ O), the pressure loss (ΔPs) of the water electrolysis stack is 89.5 (mmH ₂ O), and the total pressure The loss is 167.1 (mmH ₂ O).
On the other hand, the circulating force (ΔPk) is 167.1, and the circulating water rotates so as to balance. Further, the head difference ΔH may be increased in order to increase the circulation force.

  It should be noted that the head difference ΔH is required to be 1 m minimum from the oxygen side circulation calculation. The inner diameter of the container body was 0.8 m, and the thickness of the purification layer 13 was 0.65 mm. It should be noted that the joint for connecting the first feed pipe 19-1 for feeding the hydrogen / water / two-layer flow 18-1 to the first chamber 14-1 of the container body 11 so that the head difference is variable. The rising pipe 19-1a having an arbitrary length can be connected via the 19-1b. Further, a second feed pipe 19-for feeding the oxygen / water / two-layer flow 18-2 to the second chamber 14-2 of the container body 11 so that the head difference on the oxygen side can be varied. The ascending pipe 19-2a having an arbitrary length can be connected through a joint 19-2b connected to the pipe 2.

  Thus, since the circulating water naturally circulates inside the container main body 11, a conventional pump is unnecessary, and the in-house efficiency is improved.

  Next, an operation of operating the water electrolysis device to circulate the circulating water into the natural circulation and purify it by the purification layer 13 during the circulation will be described.

  First, the purification layer 13 is filled in the container body 11, and then water supply is started. Thereafter, the inside of the container body is pressurized to a predetermined pressure (7 ata). Next, the circulating water 16 purified by the heating unit 31 is heated to a predetermined temperature (80 ° C.). Thereafter, power is supplied to the water electrolysis stack 15 to start water electrolysis. By this water electrolysis, a hydrogen / water two-layer flow 18-1 and an oxygen / water two-layer flow 18-2 are formed in the water electrolysis stack 15, and gases of hydrogen and oxygen rise. Circulation begins as this upward flow is formed. Thereafter, when the balance is achieved as described above, natural circulation occurs, and the hydrogen / water two-layer flow 18-1 and the oxygen / water two-layer flow 18-2 from the water electrolysis stack are respectively connected to the first feeding pipe 19-1. Hydrogen and oxygen are sent to the first chamber 14-1 and the second chamber 14-2 through the second feed pipe 19-2, respectively, where gas-liquid separation is started.

That is, hydrogen is separated as a gas from the hydrogen / water bilayer flow 18-1 introduced into the first chamber 14-1. Water flows to the lower purification layer 13 side, where it is purified. Further, oxygen is separated as a gas from the oxygen / water two-layer flow 18-2 introduced into the second chamber 14-2. The separated circulating water 12 flows to the purification layer 13 side located on the lower side of the container, where it becomes the purified circulating water 16 that has been purified.
As described above, in the water electrolysis apparatus 10 according to the present embodiment, the container main body 11 integrally has the gas-liquid separation unit and the purification unit, and the water from which hydrogen and oxygen are separated passes through the purification layer 13. Impurities are removed. Thereafter, the purified circulating water 16 is supplied to the water electrolysis stack 15.

  The separated hydrogen and oxygen are respectively a hydrogen discharge unit 20 that discharges hydrogen from the first chamber 14-1 provided at the top of the container body, and an oxygen discharge that discharges oxygen from the second chamber 14-2. It is discharged to the outside by the part 21 and used.

  As a result, according to the present embodiment, both the purification unit and the gas-liquid separation unit are provided inside the container body, and the circulating water is circulated by natural circulation. Since there is no need to install a purification device or the like outside, and there is also little piping, it is possible to provide a water electrolysis device having a compact and simple configuration. As a result, the in-house efficiency can be greatly improved.

As shown in FIG. 1, for example, a wind power generator 50 and a solar power generator 60 are used as natural energy, and a solar water heater 90 is used to heat water to be supplied. The pressure (P) within the length of about 2 m and the diameter of 0.8 m is 0.7 MPa (7 ata), the current density (I) is 1 A / cm ² , the temperature (T) is 80 ° C., and the oxygen in the purification layer 13 When the water flow rate of the circulating water on the side was 0.5 L / min / cell, 2.6 Nm ³ / hr of hydrogen could be produced.
Since the amount of hydrogen used in a vehicle using a fuel cell is 30 Nm ³ / day per vehicle per day, the water electrolysis apparatus of this embodiment also provides fuel for two vehicles per day. be able to.

  As described above, the water electrolysis system using natural energy according to the present invention is self-contained using natural energy by driving the water electrolysis device using natural energy such as a wind power generator or a solar power generator. Hydrogen can be supplied and is suitable for efficient production of hydrogen.

It is a schematic perspective view which shows the natural energy utilization water electrolysis system which concerns on an Example. It is a schematic perspective view which shows the water electrolysis apparatus which concerns on an Example. FIG. 6 is a cross-sectional view taken along arrow AA in FIG. 5. FIG. 3 is a front view of FIG. 2. It is a BB arrow line view of FIG. It is the schematic which shows the ultra-high pressure water electrolysis apparatus which concerns on an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water electrolysis apparatus 11 Container body 12 Circulating water 13 Purified layer 14-1 First chamber 14-2 Second chamber 16 Purified circulating water 17 Water supply pipe 18-1 Hydrogen / water / two-layer flow 18-2 Oxygen / Water / two-layer flow 19-1 1st feed pipe 19-2 2nd feed pipe 20 Hydrogen discharge part 21 Oxygen discharge part 25 Partition plate 50 Wind power generator 60 Solar power generator 70 Secondary battery 80 Current・ Voltage control device 90 Solar water heater

Claims (7)

A water electrolyzer that electrolyzes water to generate hydrogen and oxygen;
A current / voltage control device for controlling a current / voltage for driving the water electrolysis device;
A natural energy-use water electrolysis system comprising a natural energy power generation device that obtains electricity by natural energy. In claim 1,
Furthermore, the water electrolysis system using natural energy, comprising a secondary battery that stores electricity from the natural energy power generation device. In claim 1 or 2,
Use of natural energy characterized in that the natural energy power generation device is a wind power generation device, a solar power generation device, a hydroelectric power generation device, a wave power generation device, a geothermal power generation device, an ocean temperature difference power generation device or a combination thereof Water electrolysis system. In any one of Claims 1 thru | or 3,
A natural energy-utilizing water electrolysis system, wherein water supplied to the water electrolysis apparatus is heated by a solar water heater. In any one of Claims 1 thru | or 4,
The water electrolysis device is
A purification layer provided in the container body for purifying circulating water,
A partition plate that hangs down from the top of the container body and separates the inside of the container body into a first chamber and a second chamber;
A water electrolysis stack that is provided outside the container body and generates hydrogen and oxygen by electrolyzing the circulating water;
A water supply pipe for supplying purified water to the water electrolysis stack;
A first feed pipe for feeding a hydrogen / water bilayer flow entrained with circulating water from the water electrolysis stack to the first chamber of the container body;
A second feed pipe for feeding oxygen / water / two-layer flow entrained with circulating water from the water electrolysis stack to the second chamber of the container body;
A hydrogen discharger for discharging hydrogen from the first chamber;
An oxygen discharge part for discharging oxygen from the second chamber;
A natural energy-utilizing water electrolysis system characterized by being circulated naturally while purifying the circulating water supplied to the water electrolysis stack. In claim 5,
A natural energy-utilizing water electrolysis system, wherein the container body is a pressure-resistant container. In any one of Claims 1 thru | or 4,
The water electrolysis device is
A purification layer provided in the pressure vessel body for purifying circulating water,
A partition plate that hangs down from the top of the pressure vessel main body and separates the inside of the container main body into a first chamber and a second chamber;
A water electrolysis stack that is provided at the lower part of the main body of the pressure vessel and generates hydrogen and oxygen by electrolyzing purified circulating water;
A water supply section for supplying purified water to the water electrolysis stack;
A first feed pipe for feeding a hydrogen / water bilayer flow entrained with circulating water from the water electrolysis stack to the first chamber of the container body;
A second feed pipe for feeding oxygen / water / two-layer flow entrained with circulating water from the water electrolysis stack to the second chamber of the container body;
A hydrogen discharger for discharging hydrogen from the first chamber;
An oxygen discharge part for discharging oxygen from the second chamber;
A natural energy-utilizing water electrolysis system characterized by being circulated naturally while purifying the circulating water supplied to the water electrolysis stack.

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