JP2002056880A - Water electrolysis device and solid polymer type fuel cell generating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for effectively utilizing the electric energy and realizing the evenness of a load of a power system. SOLUTION: This generating system has at least a water electrolysis device and a solid polymer type fuel cell. Gaseous hydrogen and gaseous oxygen are produced by water electrolysis by the water electrolysis device, and produced gaseous hydrogen and gaseous oxygen are separately stored, and they are taken out when the power is required. When leading these gases to the solid polymer type fuel cell, gaseous hydrogen is supplied to a fuel electrode of the cell, and gaseous oxygen is supplied to an air electrode of the cell to generate the power in this water electrolysis device and solid polymer type fuel cell generating system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel power generation system combining a water electrolysis device and a polymer electrolyte fuel cell.

[0002]

2. Description of the Related Art In recent years, power demand during the day has greatly increased, while demand for power at midnight has been small, and the gap between power demand during the day and night has been increasing. For this reason, as shown in FIG. 1, it is necessary to correct the above difference and level the load of the power system.

[0003] As a measure to correct the disparity, attempts have been made to increase the demand for electric power at midnight by promoting the spread of cooling and heating by using electric water heaters and ice heat storage. Has not yet been achieved. As means for realizing power load leveling, large-scale pumped-storage power plants are available, but it is becoming increasingly difficult to secure land for power plants in Japan, and there is a problem in terms of future prospects.

On the other hand, it is also conceivable to suppress the amount of power generated at midnight, particularly the amount of nuclear power generation, which accounts for a large proportion of the total power generation. However, nuclear power generation has a narrow load adjustment range, and it is virtually impossible to reduce the generation load even at night.

[0005] Apart from this, various techniques for effectively utilizing electric energy have been studied. For example, a method has been proposed in which hydrogen gas is generated by electrolysis of water, transported in a gaseous state or as liquefied hydrogen, and used in a power consuming area. Specifically, there is a We-net plan being implemented by the New Energy and Industrial Technology Development Organization (NEDO). FIG. 2 shows the schematic system flow. The plan uses water from Canada's hydroelectric power to electrolyze water, transport the resulting hydrogen gas to Japan as liquefied hydrogen, and use it as an energy source. Other plans include producing hydrogen gas by electrolyzing water using solar cell energy installed in desert areas. Both plans,
Basically, it can be said to be a grand plan that assumes a hydrogen energy society. However, these plans do not specifically consider the effective use of oxygen generated with hydrogen in the electrolysis of water.

[0006] It has also been considered to use a fuel cell as one of the methods of utilizing hydrogen energy. However, the fuel cell system installed in the consuming area can use hydrogen gas but does not use oxygen gas, so improvement in power generation efficiency cannot be expected, and it is still insufficient in terms of effective use of energy It can be said.

At present, the development of NaS batteries and redox flow batteries is also underway, but the power generation capacity is limited to about 1 MW, and the increase in capacity must wait for future research and development.

[0008] Further, it is conceivable to cut off the peak of electric power by operating the phosphoric acid type fuel cell using city gas as a fuel by DSS operation. It takes more than time and is not a practical system.

[0009]

As described above, at present, a system that can effectively use electric energy is still under development.

[0010] Accordingly, a main object of the present invention is to provide a system which can effectively use electric energy and can realize load leveling of a power system.

[0011]

Means for Solving the Problems The present inventor has made intensive studies in view of the problems of the prior art, and as a result, has found that a specific system can achieve the above object, and has completed the present invention.

That is, the present invention relates to a power generation system having at least a water electrolyzer and a polymer electrolyte fuel cell, wherein hydrogen gas and oxygen gas are produced by electrolysis of water by the water electrolyzer, and the produced hydrogen is produced. The gas and the oxygen gas are stored, respectively, and when the electric power is required, the hydrogen gas and the oxygen gas are taken out. When introducing these gases into the polymer electrolyte fuel cell, the hydrogen gas is supplied to the fuel electrode of the battery. The present invention also relates to a water electrolysis-polymer electrolyte fuel cell power generation system, wherein power is generated by the fuel cell by supplying oxygen gas to an air electrode of the battery.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A water electrolysis apparatus-polymer electrolyte fuel cell power generation system of the present invention is a power generation system having at least a water electrolysis apparatus and a polymer electrolyte fuel cell, wherein Producing hydrogen gas and oxygen gas by electrolysis, storing the produced hydrogen gas and oxygen gas respectively, extracting the hydrogen gas and oxygen gas when electric power is needed, and using these gases as solid polymer fuel cells When the fuel cell is introduced, hydrogen gas is supplied to the fuel electrode of the battery, and oxygen gas is supplied to the air electrode of the battery, whereby power is generated by the fuel cell.

Electrolysis of Water Electrolysis of water is performed by a water electrolysis device. The type of the water electrolysis device is not particularly limited. For example, known devices such as a solid polymer water electrolysis device and a soda method water electrolysis device can be used.

In particular, since the polymer electrolyte water electrolyzer can generate and store hydrogen gas and oxygen gas in a pressurized state, the air blower is used to supply gas to the polymer electrolyte fuel cell. This is preferable in that the device such as the above becomes unnecessary. Further, the increase in water electrolysis reaction energy due to the pressurizing operation is slight, and efficient energy storage is possible. Water electrolyzers using solid polymer membranes have already been put to practical use in small or medium capacity machines, and these can also be used as water electrolyzers in the system of the present invention.

Storage of Hydrogen Gas and Oxygen Gas The hydrogen gas and oxygen gas generated by the electrolysis of water are temporarily stored. The stored gas may be a part of hydrogen gas and oxygen gas generated by electrolysis of water,
Alternatively, all of the gas may be stored, but usually all of the generated gas may be stored. These gases can be stored, for example, in a hydrogen tank and an oxygen tank, respectively.
Known structures and sizes of the tank can be appropriately adopted. Also, one or more tanks may be provided in the system.

The stored hydrogen gas and oxygen gas are taken out when electric power is required, and these gases are introduced into a polymer electrolyte fuel cell. For example, hydrogen gas and oxygen gas are produced by electrolysis of water at night using electric power at midnight, and these are stored in a hydrogen tank and an oxygen tank, respectively. It may be taken out and supplied to a polymer electrolyte fuel cell to generate power. The power obtained by the power generation may be supplied as daytime power.

In the system of the present invention, the gas storage pressures of the hydrogen tank and the oxygen tank are not particularly limited. The pressure is not restricted if the pressure is 10 atm or less according to the High Pressure Gas Control Law. When extracting the gas stored under pressure, a turbine generator can be installed so that the gas pressure of the gas extracted from at least one of the hydrogen tank and the oxygen tank can be controlled. For example, if a microturbine generator or the like is installed in a gas discharge system such as a gas pipe, the gas pressure can be controlled (depressurized) and, at the same time, the pressure energy of the gas can be effectively used. The generator may be any as long as it has a turbine. For example, a known turbine generator such as a microturbine generator, an expansion turbine generator, or the like can be used.

Power Generation by Polymer Electrolyte Fuel Cell A known polymer electrolyte fuel cell (PEFC) itself can be used, and its type and structure are not particularly limited. Further, one or more solid polymer fuel cells may be provided in the system.

There are various types of fuel cells such as an alkaline type, a phosphoric acid type, a solid polymer type, a molten carbonate type, and a solid electrolyte type. When the system of the present invention is used to resolve the difference in power demand between day and night, short start-stop time and daily start-stop operation (DSS) are required for power generation for about 8 to 10 hours in daytime.
Operation) is required. For such applications, the alkaline form,
It is applicable to fuel cells such as phosphoric acid type and solid polymer type.
Among them, pure hydrogen gas and pure oxygen gas are used directly, so that there is no danger of corrosion even at high voltage, and because of low temperature operation, start-up and shutdown are quick and the construction cost can be lower than other models. In the present invention, a polymer electrolyte fuel cell is used. Generally, the life of a polymer electrolyte fuel cell is 8 hours / 1 day x 365 days x 10 years x 0.8 when the DSS operation is used for 8 years / 1 day for 15 years. = 35,040 hours. This is equivalent to the current development target of 40,000 hours for the cell life of the polymer electrolyte fuel cell, and can be sufficiently endured for practical use.

The operating pressure of the polymer electrolyte fuel cell is as follows:
Any of a normal pressure type, a pressurization type, and the like can be adopted, and may be appropriately selected according to the type of the fuel cell to be used, operating conditions of the system, and the like. The normal pressure type is sufficient in terms of equipment cost, reliability, etc.
It is preferable to use a pressure-transformation type system under an atmospheric pressure (particularly 1 to 7 atm). With the pressurized transformer type, it is possible to achieve high power generation efficiency in the entire load region.

Utilization of Water Produced by Polymer Electrolyte Fuel Cell In the system of the present invention, if necessary, water produced by the reaction between hydrogen and oxygen in the polymer electrolyte fuel cell is recovered, and the recovered water (recovered water) Part or all of water) can be used for electrolysis of water by a water electrolysis device. That is,
In the system of the present invention, by circulating the recovered water to the water electrolysis device, it is possible to effectively use the recovered water.

In the system of the present invention, all the water for water electrolysis can be supplied from external city water or industrial water. However, in this case, the cost of water treatment is increased by the amount of the large pure water production apparatus required. On the other hand, in the system of the present invention, the reaction between the hydrogen gas and the oxygen gas in the fuel cell produces high-quality water close to pure water, and this water can be suitably used for water electrolysis. As described above, if a part or all of the recovered water is used for water electrolysis, it is possible to reduce the cost of supplying water for water electrolysis and further increase the power generation efficiency.

Specifically, water vapor is generated at the fuel electrode and the air electrode due to the reaction between hydrogen gas and oxygen gas during power generation of the polymer electrolyte fuel cell. This water vapor is contained in the exhaust air and the exhaust fuel gas, and the water vapor is cooled by a cooler or the like and can be recovered as condensed water (drain water).
Since this drain water has much higher purity than city water or industrial water supplied from outside the system, it can be used as electrolysis water as it is, but may be used after performing necessary treatment.

Further, since the water generated by the fuel cell is theoretically generated in the same amount as the water required for water electrolysis, it is possible to supply the necessary electrolysis water with the whole recovered water. However, some water loss may occur due to evaporation or the like.
Therefore, in such a case, if necessary, it is sufficient to appropriately supply the insufficient water from outside the system.

The obtained recovered water is usually stored in a dedicated tank (pure water tank). If necessary, part or all of the recovered water can be supplied to the water electrolysis device. One or more pure water tanks may be provided as necessary. Further, the pure water tank may be provided with a heating device such as a bottoming heater as needed.

Utilization of Heat Generated by Polymer Electrolyte Fuel Cell In the system of the present invention, the recovered water is heated (including heat retention) by using part or all of the heat generated by the polymer electrolyte fuel cell.
Hereinafter the same). In the system of the present invention, it is possible to use the waste heat of the polymer electrolyte fuel cell to heat and maintain the water in the water circulation system, particularly the pure water tank, thereby improving the efficiency of water electrolysis, thereby improving the effective use of residual heat. It becomes possible.

Table 1 shows an example of the locations where waste heat is generated, the conditions of heat utilization, and the heat utilization destinations in the system of the present invention.

[0029]

[Table 1]

Hot water of about 60 ° C. is obtained for the battery cooling water, and hot water of about 40 to 60 ° C. is obtained for the battery stack. These hot water (heat) is used to heat and maintain the water tank, raise or preheat external makeup water, and preheat hydrogen gas and oxygen gas used in fuel cells (for keeping the gas tank warm). Is done.

As described above, by using the heat energy of the warm water to heat the water tank or the like, it is possible to realize the utilization of the heat. These heat energies can be used alone or in combination of two or more. Also,
If necessary, heat energy can be supplied from the outside by a boiler, an electric heater or the like.

The temperature for heating the recovered water (water for electrolysis) may be appropriately set according to the type of equipment, the operating conditions of the system, and the like. FIG. 3 shows the relationship between the electrolysis temperature and the electrolysis voltage in the polymer electrolyte water electrolysis device. As shown in FIG. 3, heating water at a higher temperature (usually about 80 to 100 ° C.) is more excellent in electrolysis efficiency. For this reason, in the system of the present invention, the water for electrolysis is
By heating as described above, it is possible to further improve the electrolysis efficiency. On the other hand, the temperature of the hot water is at most 60 ° C. Therefore, when heating the water for electrolysis to 80 ° C. or higher, for example, the heat energy of the above-mentioned hot water may be used for heating to 60 ° C., and the heating device such as a heater may be used for heating at 60 ° C. or higher.

[0033]

According to the present invention, as a system combining a polymer electrolyte fuel cell and a water electrolysis device, hydrogen gas and oxygen gas are produced by electrolysis of water, and the hydrogen gas and oxygen gas are supplied to a hydrogen tank and an oxygen tank. This system supplies hydrogen gas and oxygen gas to a polymer electrolyte fuel cell to generate electric power when electric power is required.

For example, water electrolysis is performed by a water electrolyzer using late-night power, which has low power demand, and the generated hydrogen gas and oxygen gas are stored, and these gases are used during daytime when power demand is high. By using a polymer electrolyte fuel cell to generate electric power, surplus electric power such as midnight electric power is effectively used. The system of the present invention can contribute to load leveling of the power system.

That is, the system according to the present invention comprises:
In particular, it plays a role of leveling the load of the power generation equipment, and plays a role similar to the role that the pumped-storage power plant conventionally performs.

In the system of the present invention, since a hydrogen gas and an oxygen gas are used as a reducing agent and an oxidizing agent for a fuel cell, a reforming system is not required. Therefore, unlike the fuel cell of the city gas fuel whose startup time exceeds 3 hours, the DSS operation can be relatively easily realized in the system of the present invention.

Further, in the system of the present invention, both hydrogen gas and oxygen gas generated in the electrolysis of water can be used as reaction gas of the fuel cell, which can contribute to effective use of resources and improvement of power generation efficiency.

[0038]

The system of the present invention has a system configuration without a reforming gas system such as a reformer in order to directly use hydrogen gas, unlike a system which requires reforming such as the use of city gas.
Further, since oxygen gas is mainly used in the cathode of the fuel cell, the capacity of the air blower is significantly reduced as compared with the case where air is used, and the auxiliary power is considerably reduced.

FIG. 4 shows a current density-average cell voltage characteristic (IV characteristic) in a normal pressure type polymer electrolyte fuel cell.
The solid line shows the IV characteristics when pure hydrogen gas and air are used. Since hydrogen gas (pure hydrogen gas) and oxygen gas (pure oxygen gas) can be used in the system of the present invention, the potential of the air electrode is improved, and the predicted line is as shown by the broken line in FIG. The cell voltage increases by about 100 mV over the entire load range.
In the polymer electrolyte fuel cell, even if the cell voltage exceeds 0.8 V, there is no risk of corrosion or the like, and the potential can be set to a high potential, so that power generation can be performed with high efficiency. The setting of the operating voltage is determined by the relationship between the current density and the number of cells (cost). In a stationary fuel cell, it is preferable that the operating potential is as high as possible, with an emphasis on efficiency.

It is preferable to employ a high-efficiency polymer electrolyte water electrolyzer as the water electrolyzer of the power generation system in which the water electrolyzer and the polymer electrolyte fuel cell are combined. The water electrolysis efficiency of this polymer electrolyte water electrolyzer does not basically change even in a pressurized state. Therefore, the hydrogen gas and the oxygen gas generated in the water electrolysis apparatus can be stored in a pressurized state without using a gas compressor or the like. This pressurization generally requires a considerably large compression power of several hundred kW in a 5 MW system, whereas a solid polymer water electrolyzer does not need to supplement such power. The energy reduction effect due to the omission of the force is great.

When the pressure of the stored hydrogen gas and oxygen gas is reduced to the operating pressure of the polymer electrolyte fuel cell, a micro gas turbine generator or the like that can use the gas pressure is installed in the system. In addition to functioning as a decompression device, the pressure energy can be effectively used.

[0042]

The present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the examples.

Embodiment 1 FIG. 5 shows an outline of the system of the present invention. This system consists of power transmission and reception equipment (1), polymer electrolyte water electrolysis device (2), hydrogen tank (3), oxygen tank (4), polymer electrolyte fuel cell (5), pure water tank (6) and the like.

For example, in the nighttime, midnight power is received through the power transmission / reception facility (1) and used as power required for electrolysis of water in the polymer electrolyte water electrolysis device (2). The power transmission and reception equipment includes a quadrature converter for converting AC power of a power system into DC power required by a water electrolysis device, a transformer for controlling the power to a predetermined voltage, and the like.

The water required for the electrolysis of water is supplied from a pure water tank (6). Since pure water is required for this water property, it is necessary to store pure water in the replenishment pure water tank.
Supplying all of the electrolysis water from external city water or industrial water requires a large-scale water treatment device and increases the cost of water treatment, whereas the water generated by the fuel cell has few impurities and is A system that reuses the water produced by the fuel cell in water electrolysis is preferable because it can be used for electrolysis. That is, in a polymer electrolyte fuel cell, water vapor (produced water) generated by a reaction between hydrogen and oxygen is recovered as drain water, and a part or all of the recovered water can be used for electrolysis of water by a water electrolyzer. it can. Such a system is also included in the present invention.

The hydrogen gas and the oxygen gas produced by the polymer electrolyte water electrolyzer (2) are supplied to a hydrogen tank (3), respectively.
And stored in an oxygen tank (4). Pressurization of gas for storage can be achieved by setting the pressure during electrolysis of the polymer electrolyte water electrolysis device (2) higher than the pressure of the tank. The dimensions of the gas tank may be appropriately set according to the power generation capacity, the pressure of the gas tank, and the like.

As described above, the amounts of hydrogen gas and oxygen gas necessary for power generation of the polymer electrolyte fuel cell in the daytime may be stored in the hydrogen tank (3) and the oxygen tank (4), respectively.

In the daytime, power is generated by the polymer electrolyte fuel cell (5), and hydrogen gas is supplied from the hydrogen tank (3) and oxygen gas is supplied from the oxygen tank (4). Since the gas is stored under pressure in the gas tank, it is necessary to lower the operating pressure (normally, normal pressure) of the polymer electrolyte fuel cell (5). In this case, a small microturbine generator (7) is provided for each of the hydrogen gas discharging system and the oxygen gas discharging system.
By installing (8), the operating pressure can be reduced, and at the same time, the pressure energy can be recovered as electric energy.

The electric power generated by the polymer electrolyte fuel cell (5) is sent to a power transmission / reception facility (1), converted into an alternating current, boosted to a predetermined voltage, and transmitted. The electric power generated by the small-sized microturbine generators (7) and (8) may be used for in-house power (for the system of the present invention) or may be transmitted to a power transmission system.

Water generated during power generation is discharged from the stack, but is cooled through an off-gas cooler (9), collected as drain water, and stored in a pure water tank (6). The stored water can be circulated through a water electrolysis device and used as electrolysis water.

The battery cooling water passes through the gas preheater (13),
The hydrogen gas and the oxygen gas are heated and cooled by the heat exchanger (10).

The water for electrolysis in the water electrolyzer is a pure water tank (6).
However, the temperature is raised to a predetermined temperature by an electric heater (11) during the water splitting. It is desirable to use low-cost midnight power for the electric heater.

FIG. 6 shows a three-dimensional layout of each facility used in the system of the present invention. In FIG. 6, electric power from the outside is transmitted to the water electrolysis device via the substation. Water is supplied to the water electrolysis device from a pure water tank connected to the fuel cell. Six polymer electrolyte fuel cells are arranged, and the water generated by each fuel cell is stored in a pure water tank. Hydrogen gas and oxygen gas are supplied to the fuel cell from a hydrogen tank and an oxygen tank, respectively. Cooling towers are installed to release cold waste heat and seasonal excess heat that is not available in the system.

Reference Example 1 The effect of improving the efficiency of the system of the present invention was roughly estimated when a polymer electrolyte fuel cell was used.

The power generation efficiency of the polymer electrolyte fuel cell uses pure hydrogen and pure oxygen at the rated load, so that the cell voltage is as high as 0.8 V even in the normal pressure type, and the power generation efficiency is about 65%.
The power conversion efficiency is about 73%, which is 0.9 V for a 4 atm pressure transformer type.

The electrolysis efficiency of the polymer electrolyte water electrolyzer is as high as about 97%, and the power transmission end efficiency of the fuel cell stack of the polymer electrolyte water electrolyzer and the polymer electrolyte fuel cell combined with this is always high. About 61.0% for pressure type, about 6% for pressure transformer type
It becomes 8.8%.

Normal pressure type: 0.97 (water electrolyzer) x 0.65 (PEFC) x 0.97 (INV) = 61.0% Pressurized transformer type: 0.97 (water electrolyzer) x 0.73 (PEFC) x 0.97 (INV) = 68.8% The system is expected to have the effect of reducing internal power. When the pressure of hydrogen gas and oxygen gas produced by the water electrolysis device is increased by a compressor, 450 KW at 10 atm (about 300 KW of hydrogen gas compressor, about 150 K of oxygen gas compressor)
W) requires large internal power. On the other hand, in the system of the present invention, this power by pressurizing the water electrolysis device is unnecessary.

In the system of the present invention, when a turbine generator is used, the output can be increased. The output of the microturbine generator for decompression of hydrogen gas and oxygen gas is about 25 kW for hydrogen gas and about 1 kW for oxygen gas.
The power generation capacity is about 2 KW. These driving energies can be self-supplied in the system of the present invention, and need not be additionally input from outside.

For this reason, high efficiency can be expected as the power generation efficiency of the system as a whole: normal pressure type: 61.0% × 5037/5000 = 61.5% pressurized transformer type: 68.8% × 5037/5000 = 69.3%. Midnight power generation unit price is 6 yen /
Assuming kWh, the daytime unit price is 9.8 yen / k for normal pressure
Wh, about 8.6 yen / kWh.

Water Electrolyzer-In the polymer electrolyte fuel cell power generation system, the water quality required for the water electrolysis of the water electrolyzer is pure water. When this pure water is produced from city water or industrial water, it is necessary to treat the water with a large-scale water treatment facility (large-scale ion exchange membrane). And Generally, it is said that the production of pure water by an ion exchange membrane costs about 2000 yen per ton.

The amount of hydrogen required to operate a 5 MW polymer electrolyte fuel cell system for 8 hours a day is 28800 Nm
³ , the amount of water required to produce this is 23200k
g / day, and the water cost is 50,000 yen / day.

As described above, the cost of the water treatment can be reduced by collecting the water of the polymer electrolyte fuel cell and using it for water electrolysis. Further, since a water circulation cycle is possible, external water supply is minimized, and the system of the present invention can be installed in deserts, mountains, and the like where water resources are scarce.

Regarding the heating of water for water electrolysis, the energy required to raise the required pure water from, for example, 15 ° C. to 80 ° C. is (508) × 23,200 kg = 1,508,000 kcal and 1,508 2,000 kcal. Approx. 5 from 15 ° C
When using exhaust heat to raise the temperature to 0 ° C, the
Heating is performed by an electric heater up to 0 ° C., and the calorie of the required electric power there is 696,000 kcal. The difference between the case of using exhaust heat and the case of not using it is that daytime power 24 yen / kwh, midnight power 6 yen / kwh, and efficiency of electric heater is 95%. Electric heater only 1,754 kwh 10523 yen From the above results, the cost reduction effect of about 6,000 yen / day can be obtained in the case of using both daytime exhaust heat and nighttime electric heater.
When this is converted to an annual figure, 175
There is a cost reduction effect of about 10,000 yen.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a load leveling effect of a power system according to the present invention.

FIG. 2 is a schematic system flow diagram of a Web-net plan.

FIG. 3 is a diagram showing a relationship between an electrolysis temperature and an electrolysis voltage in a polymer electrolyte water electrolysis device.

FIG. 4 is a diagram showing a change in IV characteristics of a polymer electrolyte fuel cell according to the present invention.

FIG. 5 is a system diagram showing an example of a power generation system of a water electrolysis device-polymer electrolyte fuel cell of the present invention.

FIG. 6 is a schematic diagram of an example of a three-dimensional arrangement of each facility used in the system of the present invention.

Claims (8)

[Claims] 1. A power generation system having at least a water electrolysis device and a polymer electrolyte fuel cell, wherein hydrogen gas and oxygen gas are produced by electrolysis of water by the water electrolysis device, and the produced hydrogen gas and oxygen gas are produced. The hydrogen gas and the oxygen gas are taken out when electric power is needed, and when introducing these gases into the polymer electrolyte fuel cell, hydrogen gas is supplied to the fuel electrode of the battery, and the A water electrolysis apparatus wherein power is generated by the fuel cell by supplying oxygen gas to an air electrode.
Solid polymer fuel cell power generation system. 2. The system according to claim 1, wherein the water electrolysis device is a polymer electrolyte water electrolysis device. 3. A polymer electrolyte fuel cell having an operating pressure of 1 to 7
The system according to claim 1, wherein the system is operated under a pressure change in a pressure range. 4. A hydrogen generator and an oxygen tank for storing hydrogen gas and oxygen gas, respectively, and a generator is installed so as to be able to control the gas pressure of gas extracted from at least one of the tanks. The system according to claim 1. 5. The system according to claim 1, wherein a turbine generator is provided so as to convert the pressure of steam generated in the polymer electrolyte fuel cell into electric energy. 6. A polymer electrolyte fuel cell, wherein water generated by the reaction between hydrogen and oxygen is recovered, and part or all of the recovered water is used for water electrolysis by a water electrolyzer.
The system according to any one of the above. 7. The system according to claim 6, wherein the water for electrolysis is heated by using part or all of the heat generated in the polymer electrolyte fuel cell. 8. The system according to claim 1, wherein the electrolysis of water by the water electrolyzer is performed using midnight power, and the power generated by the polymer electrolyte fuel cell is supplied as daytime power. .