JP6647030B2 - Pure hydrogen type hot water storage unit - Google Patents

Description

  The present invention relates to a pure hydrogen hot water storage unit, and more particularly to a pure hydrogen hot water storage unit provided with a hydrogen fuel burner.

  Conventionally, city gas (natural gas), LP gas, kerosene, and the like have been generally used as fuel for household water heaters. Hydrogen is separated from hydrocarbons contained in city gas, kerosene, and other fuels by a reformer. 2. Description of the Related Art A fuel cell (reformation type fuel cell system) that generates power by chemically reacting generated hydrogen with air to generate power is known.

  In a domestic fuel cell, since heat is generated together with power generation, a hot water supply unit having improved energy efficiency by effectively utilizing the heat energy can be configured (for example, Patent Document 1).

  The hot water supply unit described in Patent Literature 1 includes a heat exchanger that collects heat generated by the operation of the fuel cell, a hot water storage tank that stores hot water heated by the heat exchanger, and hot water obtained from the hot water storage tank. When the temperature is low, a water heater (boiler) that heats the water to a predetermined temperature and then taps the hot water is provided. With such a configuration, while using the heat energy of the fuel cell efficiently by the heat exchanger, it is possible to heat the water to a predetermined temperature by the water heater and supply necessary and sufficient hot water to the kitchen or bathroom.

  On the other hand, recently, technology development for generating fuel cells using pure hydrogen as fuel (hydrogen fuel) instead of generating hydrogen from fuel such as city gas (pure hydrogen type fuel cell system is called .) Is expected. As a pure hydrogen type household fuel cell, the power generation amount is less than 1 kW, and the power generation efficiency can be increased to about 50%, thereby improving the power generation efficiency as compared with the reforming type.

Japanese Patent No. 4536022 (Claim 1, paragraphs 0023 to 0024 of the specification, FIG. 1)

  However, since the hot water supply unit described in Patent Literature 1 uses a reforming type fuel cell, a reforming device for generating hydrogen is required, which complicates the equipment structure and increases the size. There was a problem.

  Further, in the hot water supply unit described in Patent Literature 1, when an attempt is made to apply a pure hydrogen type fuel cell instead of a reforming type fuel cell, a general fuel such as city gas or kerosene is supplied to a water heater (boiler). Since it is used, a double pipe of a general fuel and a hydrogen fuel for a pure hydrogen fuel cell is required, and there has been a problem that the equipment configuration is complicated.

  Low-power type fuel cells with a power generation of less than 1 kW are the mainstream of pure hydrogen type household fuel cells. In some cases, there is a conflicting problem that the shortage of heat must be compensated for by a general fuel such as city gas.

  The present invention has been made in view of such a background, and has as its object to provide a pure hydrogen type hot water storage unit using pure hydrogen as fuel.

To solve the above problems, the invention according to claim 1, a fuel cell system for generating a hydrogen and oxygen by chemical reaction, and the hydrogen supply source that supplies hydrogen to a fuel cell system, generated from the fuel cell system A pure hydrogen type hot water storage unit including a heat exchanger that heats hot water with heat, a hot water storage tank that stores hot water, and a hydrogen fuel burner that heats hot water by burning hydrogen supplied from a hydrogen supply source. A high-temperature hot water reservoir provided at the upper part of the hot water storage tank to discharge the stored hot water, a low-temperature hot water reservoir composed of the hot water stored at the lower part of the hot water storage tank, and a low-temperature hot water reservoir and a high-temperature hot water reservoir. And a middle-temperature hot water storage layer in which a hydrogen fuel burner is disposed, and a supply port for supplying warmed water from the heat exchanger is provided on a side of the hot water storage tank corresponding to the low-temperature hot water storage layer. feature was that, the To.

  With this configuration, the pure hydrogen type hot water storage unit according to the present invention uses pure hydrogen supplied from a hydrogen supply source (hereinafter, “pure hydrogen” in the sense of hydrogen gas, and particularly needs to be distinguished from reforming type hydrogen). If there is no hydrogen, simply supply "hydrogen" to the fuel cell to generate electricity, and supply it to the hydrogen fuel burner to burn the pure hydrogen, thereby producing environmentally friendly pure hydrogen that does not emit carbon dioxide. A hot water storage unit can be configured.

That is, the pure hydrogen type hot water storage unit according to the present invention is supplied from the supply port to the upper part of the low temperature hot water storage layer of the hot water storage tank and stored by utilizing the heat (exhausted heat) generated from the fuel cell system by the heat exchanger. When the hot water is heated and the heat energy of the exhaust heat is insufficient, the hot water in the hot water storage tank can be appropriately heated by the hydrogen fuel burner. For this reason, since the system can be configured only with the pure hydrogen fuel piping, the piping for gas and the like can be eliminated, and the piping and equipment configuration can be simplified.

  In this way, the pure hydrogen type hot water storage unit according to the present invention can heat the hot water by burning the hydrogen fuel burner as needed even when the calorific value is low as in a home fuel cell system. By shortening the time and avoiding increasing the capacity of the hot water storage tank, it is possible to increase energy efficiency and secure sufficient hot water supply capacity.

The invention according to claim 2 of the present invention is the pure hydrogen type hot water storage unit according to claim 1 , wherein the supply port is provided below the hydrogen fuel burner .

With this configuration, the low-temperature hot water storage layer of the hot water storage tank is heated by the heat exchanger, and the hot water that is stored above the low-temperature hot water storage layer and has a higher temperature than the low-temperature hot water storage tank is heated by the hydrogen fuel burner. Energy efficiency can be improved by effectively utilizing the energy generated from the fuel cell.

The invention according to claim 3 of the present invention is characterized in that an inflow channel for introducing hot water of the low-temperature hot water storage layer into the heat exchanger is connected to a bottom surface of the hot water storage tank .

With this configuration, the hot water stored in the lower portion of the low-temperature hot water storage layer can be introduced into the heat exchanger from the inflow passage connected below the supply port. Hot water stored in the lower part of the low-temperature hot water storage layer has a relatively low temperature and good heat exchange efficiency in the heat exchanger.

  The invention according to claim 4 of the present invention is the pure hydrogen type hot water storage unit according to any one of claims 1 to 3, wherein the temperature sensor measures the temperature of hot water stored in the hot water storage tank. And hot water discharged from the hot water storage tank, or a flow meter for measuring the flow rate of hot water newly flowing into the hot water storage tank from the supply port, the control device, the temperature measured by the temperature sensor, And calculating the amount of heat flowing out of the hot water stored in the hot water storage tank based on the flow rate measured by the flow meter, and supplementing the outflow heat with the hot water stored in the hot water storage tank reaching a predetermined temperature. The combustion of the hydrogen fuel burner is controlled as described above.

  Here, the flow rate of hot water discharged from the hot water storage tank can be regarded as the same as the flow rate of hot water newly flowing into the hot water storage tank from the supply port.

  The pure hydrogen hot water storage unit according to claim 4 calculates the amount of heat flowing out of the hot water stored in the hot water storage tank, thereby quickly predicting the temperature decrease of the hot water storage tank so that the temperature does not decrease. Burn the hydrogen fuel burner.

  In this way, the pure hydrogen type hot water storage unit according to claim 4 can suppress the decrease in the hot water supply capacity and efficiently use the capacity of the hot water storage tank. Hot water supply capacity can be improved.

An invention according to claim 5 of the present invention is the pure hydrogen hot water storage unit according to any one of claims 1 to 4 , wherein the low-temperature hot water storage unit measures the temperature of hot water stored in the low-temperature hot water storage layer. A temperature sensor, a blower fan for blowing the combustion air of the hydrogen fuel burner to a heat exchange unit to heat the hot water, and a temperature of the hot water of the low-temperature hot water storage layer measured by the low-temperature hot water storage layer temperature sensor is preset. When the temperature becomes equal to or higher than the predetermined upper limit temperature, the cooling fan is driven in a state where the combustion of the hydrogen fuel burner is stopped to blow cooling air to the heat exchange unit, and the hot and cold water in the low-temperature hot water storage layer is discharged. And an upper limit temperature control means for cooling so as to be lower than the predetermined upper limit temperature.

  The pure hydrogen type hot water storage unit according to claim 5 of the present invention includes an upper limit temperature control unit that cools the hot water in the low temperature hot water storage so as to be lower than the predetermined upper limit temperature. Since the temperature of the hot water in the low-temperature storage tank for cooling the fuel cell system during power generation does not rise above a predetermined upper limit temperature, the cooling capacity of the fuel cell system is ensured, and a decrease in power generation efficiency is suppressed. be able to.

  Further, by cooling the hot water in the low-temperature hot water storage layer using a blower fan for blowing the combustion air of the hydrogen fuel burner to a combustion chamber, the capacity of the hot water storage tank is not excessively increased, and the fuel cell system is not changed. The required cooling capacity of the fuel cell system can be ensured without separately providing a cooling device having a cooling and heat radiation mechanism for cooling the fuel cell. For this reason, it becomes possible to reduce or eliminate the cooling device mounted on the conventional fuel cell system.

  Thus, the pure hydrogen type hot water storage unit according to claim 5 of the present invention can avoid a large capacity of the hot water storage tank and can provide a fuel cell system within a necessary and sufficient range without separately mounting a cooling device. Energy efficiency is enhanced by balancing power generation capacity and hot water supply capacity, and required power generation capacity and sufficient hot water supply capacity can be efficiently secured.

The present invention can provide a pure hydrogen type hot water storage unit using pure hydrogen as fuel.
ADVANTAGE OF THE INVENTION The pure hydrogen type hot-water storage unit which concerns on this invention shortens the heating time of hot-water, improves energy efficiency, avoiding increasing the capacity of a hot-water storage tank, and can ensure sufficient hot-water supply capacity.

It is a circuit diagram showing typically composition of a pure hydrogen type hot water storage unit concerning a 1st embodiment of the present invention. It is a circuit diagram showing typically the composition of the pure hydrogen type hot water storage unit concerning a 2nd embodiment of the present invention.

<First embodiment>
A pure hydrogen type hot water storage unit 1 according to a first embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 to be referred to is a circuit diagram schematically showing the components of the pure hydrogen type hot water storage unit, in which the flow paths of pure hydrogen and hot water are also shown in a simplified manner, and do not show the shapes and arrangements of the components. .

  As shown in FIG. 1, a pure hydrogen type hot water storage unit 1 stores hot water U (U1, U2, U3) and discharges hot water from above, and a fuel cell that generates power by chemically reacting hydrogen H1 and oxygen. A system 3, a hydrogen supply source 4 for supplying hydrogen H1 to the fuel cell system 3, a heat exchanger 31 for heating the hot water U (U1, U2, U3) by heat generated from the fuel cell system 3, and The control device 5 includes a control device 5 for controlling the fuel supply, and a hydrogen fuel burner 6 for heating the hot water U by burning the hydrogen H2 supplied from the hydrogen supply source 4.

  The pure hydrogen hot water storage unit 1 uses the hydrogen H (H1, H2) supplied from the hydrogen supply source 4 to convert the normal temperature tap water W1 supplied from the water supply port 21 to the hot water storage tank 2 into the heat exchanger 31, And a hot water supply system in which the hot water is heated to a predetermined temperature by the hydrogen fuel burner 6, and can be suitably applied to the household fuel cell system 3 in particular.

Hot water storage tank 2 includes a water supply port 21 disposed at a lower portion, a temperature sensor 22 for measuring the temperature of hot water U3, and a flow meter 23 for measuring a flow rate of hot water U3 discharged from hot water storage tank 2. I have.
Tap water W1 is supplied from the water supply port 21 to the hot water storage tank 2. Tap water W1 supplied to hot water storage tank 2 and stored therein is heated by heat exchanger 31 and heated by hydrogen fuel burner 6 to store a predetermined volume of hot water U (U1, U2, U3). It is supposed to be.

  Hot water U (U1, U2, U3) stored in hot water storage tank 2 includes low-temperature hot water storage layer U1 formed of hot water U1 stored in a lower portion of hot water storage tank 2, and hot water U3 stored in an upper portion of hot water storage tank 2. It is divided into a high-temperature hot-water storage layer U3 and a middle-temperature hot-water storage layer U2 which is an intermediate portion of the hot-water storage tank 2 and is formed between the low-temperature hot-water storage layer U1 and the high-temperature hot-water storage layer U3.

  Hot water U3 is discharged from the hot water storage layer U3. When the hot water U3 is discharged, tap water W1 flows in from the water supply port 21 by the flow rate of the tap water by the pressure of the tap water W1. In this way, hot water storage tank 2 stores hot water U (U1, U2, U3) having a predetermined capacity.

Temperature sensor 22 measures the temperature of hot water U3 discharged from hot water storage layer U3.
The flow meter 23 measures the flow rate of the hot water U3 discharged from the hot water storage layer U3.
In the present embodiment, the flow rate of the high-temperature hot water U3 discharged from the high-temperature hot water storage layer U3 is measured by the flow meter 23. However, the present invention is not limited to this. Since the flow rate and the flow rate of the tap water W1 flowing into the hot water storage tank 2 from the water supply port 21 are the same, the flow rate of the tap water W1 newly flowing into the hot water storage tank 2 may be measured by a flow meter (not shown).

When hot water U3 is discharged from hot water storage tank 2, controller 5 mixes with tap water W1 via a mixing valve (not shown) according to the supply temperature set by the user to adjust the temperature. After that, hot water is supplied to various hot water taps 24 such as a kitchen and a bathroom.
The configuration and operation of the hot water storage tank 2 are not particularly limited, and a detailed description thereof will be omitted.

  Tap water W1 flows into the low-temperature hot water storage layer U1 below the low-temperature hot water storage layer U1. For this reason, hot water (tap water W2) is stored at a lower portion of the low-temperature hot water storage layer U1 than at an upper portion of the low-temperature hot water storage layer U1.

  The area and boundaries of the hot water U (U1, U2, U3) stored in the hot water storage tank 2 are fluid depending on the temperature and amount of the hot water U1, U2, U3, the capacity of the hot water storage tank 2, the usage status, and the like. Yes, although it is not strictly distinguished, for convenience of explanation, hot water U1, U2, U3 are formally divided, but when it is not particularly necessary to distinguish hot water U1, U2, U3, collectively Hot water U (U1, U2, U3) is displayed.

  The fuel cell system 3 is a power generation system for supplying electric power used at home, and includes a fuel cell 32 that generates power by chemically reacting hydrogen and oxygen, and a hydrogen supply flow path 33 that supplies hydrogen H1 to the fuel cell 32. And Since the fuel cell 32 generates heat in the course of the chemical reaction between the hydrogen H1 and oxygen, it cools by circulating cooling water to promote the chemical reaction.

The heat exchanger 31 includes cooling water (not shown) heated by the heat generated from the fuel cell 32 and hot water U1 (tap water W2) stored in the lower part of the low-temperature hot water storage layer U1 from the water supply port 21 of the hot water storage tank 2. To heat the hot water U1 in the low-temperature hot water storage layer U1.
The heat exchanger 31 exchanges heat between the inflow passage 31a for introducing the hot water U1 (tap water W2) and the cooling water heated by cooling the fuel cell 32 and the tap water W2 to add the tap water W2. A heat exchange section 31b to be heated, a supply flow path 31c for supplying the heated tap water W3 to the upper portion of the low-temperature hot water storage layer U1 by the pump P, and a supply port of the tap water W3 formed at the upper portion of the low-temperature hot water storage layer U1. 31d.

In the present embodiment, the hot water (tap water W2) stored in the lower part of the low-temperature hot water storage layer U1 is introduced into the heat exchange unit 31b through the inflow passage 31a, but is not limited thereto. The tap water W1 supplied to the lower part of the low-temperature hot water storage layer U1 may be branched and supplied to a flow path for supplying the lower part of the low-temperature hot water storage layer U1 and a flow path for introducing the heat exchange part 31b.
Since the configuration of the fuel cell system 3 is not particularly limited, a detailed description will be omitted.

  The hydrogen supply source 4 is a unit that supplies hydrogen H (H1, H2) to the fuel cell 32 and the hydrogen fuel burner 6, and is not particularly limited, and may be a hydrogen tank that stores hydrogen H (H1, H2), The present invention can be applied to a pipeline or the like connected to a hydrogen station.

  Control device 5 calculates the amount of heat flowing out of hot water U (U1, U2, U3) stored in hot water storage tank 2 based on the temperature of hot water U3 measured by temperature sensor 22 and the flow rate measured by flow meter 23. Thus, the combustion of the hydrogen fuel burner 6 is controlled so that U (U1, U2, U3) stored in the hot water storage tank 2 reaches a predetermined temperature.

  That is, the pure hydrogen hot water storage unit 1 is quickly stored in the hot water storage tank 2 by the control device 5 calculating the amount of heat flowing out of the hot water U (U1, U2, U3) stored in the hot water storage tank 2. The temperature drop of hot and cold water U (U1, U2, U3) is predicted. Then, by burning the hydrogen fuel burner 6 so that the temperature does not decrease, the amount of heat corresponding to the amount of outflow heat can be complemented to suppress a decrease in the hot water supply capacity.

  In this way, the pure hydrogen hot water storage unit 1 can efficiently use the capacity of the hot water storage tank 2, so that the capacity of the hot water storage tank 2 can be reduced while improving the hot water supply capacity.

  The hydrogen fuel burner 6 includes a hydrogen inlet 61 that introduces hydrogen H2 from the hydrogen supply source 4, a burner unit 62 that mixes hydrogen H2 and oxygen to inject a flame 62a, and combustion that diffuses the injected flame 62a. It has a chamber 63 and a heat exchange unit 63a for heating the hot water U (U1, U2, U3) stored in the hot water storage tank 2 by the heat energy of the flame 62a.

  The hydrogen fuel burner 6 is disposed above the supply port of the supply flow path 31c so that the burner section 62 and the combustion chamber 63 are located in the middle-temperature hot water storage layer U2 between the low-temperature hot water storage layer U1 and the high-temperature hot water storage layer U3. ing. The heat exchange section 63a of the hydrogen fuel burner 6 is disposed so as to be located in the high-temperature hot water storage layer U3. With this configuration, the combustion gas diffused by the flame 62a in the combustion chamber 63 rises up the heat exchange section 63a, and can efficiently and quickly heat the hot water U3 of the high-temperature hot water storage layer U3.

The operation of the pure hydrogen hot water storage unit 1 according to the embodiment of the present invention configured as described above will be described with reference to FIG.
The pure hydrogen type hot water storage unit 1 supplies hydrogen H1 supplied from the hydrogen supply source 4 to the fuel cell 32 to generate power, and uses heat (exhausted heat) generated from the fuel cell 32 by the heat exchanger 31 to store hot water. The hot water U (U1) stored in the tank 2 is heated.

  When the heat energy of the exhaust heat is insufficient by supplying the hydrogen H2 supplied from the hydrogen supply source 4 to the hydrogen fuel burner 6 and burning the hydrogen H2, the hot water storage tank 2 is appropriately provided by the hydrogen fuel burner 6. Hot water U (U1, U2, U3) can be heated.

In this way, the pure hydrogen hot water storage unit 1 according to the embodiment of the present invention burns the hydrogen fuel burner 6 as necessary even when the calorific value is low like the fuel cell system 3 for home use. By doing so, the heating time of hot water U (U1, U2, U3) can be shortened, energy efficiency can be increased while avoiding increase in capacity of hot water storage tank 2, and sufficient hot water supply capacity can be secured.
In addition, since the system can be configured using only the pure hydrogen fuel pipe, the pipe for city gas and the like can be eliminated, and the pipe and the equipment configuration can be simplified.

<Second embodiment>
Next, a pure hydrogen hot water storage unit 1A according to a second embodiment of the present invention will be described in detail with reference to FIG.
In the following description, the pure hydrogen type hot water storage unit 1A according to the second embodiment of the present invention mainly includes the low temperature hot water storage layer temperature sensor 25 and the upper limit temperature control means 51. Since this is different from the pure hydrogen type hot water storage unit 1 (see FIG. 1), in the following description, the same reference numerals are given to the components common to the pure hydrogen type hot water storage unit 1 and the duplicate detailed description will be omitted.

  The pure hydrogen type hot water storage unit 1A according to the second embodiment of the present invention exchanges heat between the low-temperature hot water storage layer temperature sensor 25 that measures the temperature of the hot water U1 stored in the low-temperature hot water storage layer and the combustion air of the hydrogen fuel burner 6. A blower fan 6a for blowing air to the combustion chamber 63 and the heat exchanging unit 63a, and an upper limit temperature control unit 51 for managing the upper limit temperature of the hot water U1 in the low temperature hot water storage layer.

  The low-temperature hot water storage layer temperature sensor 25 is provided in the low-temperature hot water storage layer U1 of the hot water storage tank 2, but is not limited to this as long as the temperature of the hot water U1 stored in the low-temperature hot water storage layer can be measured. The temperature of the hot water (tap water W2) flowing from the low-temperature hot water storage layer U1 into the inflow passage 31a may be measured.

  The blower fan 6 a is provided in the hydrogen fuel burner 6 and is a blower for sending thermal energy (combustion air) of the flame injected from the burner section 62 to the combustion chamber 63 and the heat exchange section 63 a. When hydrogen H2 is supplied to the burner 62 through the hydrogen inlet 61 to generate a flame, the heat energy (combustion air) of the flame generated in the burner 62 is transferred to the combustion chamber 63 and the heat exchange section. It has a function of heating the hot water U1 in the low-temperature hot water storage layer by sending it to the low-temperature hot water storage layer 63a.

On the other hand, in a state in which the combustion of the burner section 62 in the hydrogen fuel burner 6 is stopped, no flame is generated in the burner section 62, so that the normal-temperature cooling air is sent into the combustion chamber 63 and the heat exchange section 63 a to reduce the temperature. It functions as a blower cooling device that cools the hot water U1 in the hot water storage layer.
Specifically, when functioning as a blower cooling device, the supply of hydrogen H2 to the burner section 62 is stopped, and the combustion fan 6a is driven in a state where the combustion of the burner section 62 is stopped, so that the low-temperature hot water storage is performed. Since the cooling air lower in temperature than the hot water U1 of the layer can be sent to the combustion chamber 63 and the heat exchange section 63a functioning as a heat exchanger, the hot water U1 of the low-temperature hot water storage layer can be cooled.

  That is, since the combustion chamber 63 and the heat exchange section 63a function as a heat exchanger, low-temperature cooling air is sent into the combustion chamber 63 and the heat exchange section 63a by the blower fan 6a, so that the medium-temperature hot water storage layer U2 or the high-temperature hot water storage Layer U3 is cooled. In this way, the cooled hot water U2 of the medium-temperature hot water storage layer and the hot water U3 of the high-temperature hot water storage layer circulate and descend to the low-temperature hot water storage layer U1, so that the cold water U1 of the low-temperature hot water storage layer is cooled.

  The upper limit temperature control means 51 stops the combustion of the hydrogen fuel burner 6 when the temperature of the hot water U1 in the low temperature hot water storage layer measured by the low temperature hot water storage layer temperature sensor 25 becomes equal to or higher than a predetermined upper limit temperature. In this state, the blower fan 6a is driven to blow cooling air into the combustion chamber 63 to cool the hot water U1 in the low-temperature hot water storage layer to a temperature lower than a predetermined upper limit temperature and manage the upper limit temperature of the hot water U1 in the low-temperature hot water storage layer. I do.

  The predetermined upper limit temperature is set in advance in consideration of the power generation capability of the fuel cell system 3 and the like so that the fuel cell system 3 can be cooled efficiently and the required power generation capability can be secured. The predetermined upper limit temperature can be, for example, 60 ° C.

The pure hydrogen hot water storage unit 1A according to the second embodiment of the present invention configured as described above has the following operational effects.
The pure hydrogen type hot water storage unit 1A according to the second embodiment of the present invention is provided with the upper limit temperature control means 51 for cooling the hot water U1 of the low temperature hot water storage so as to be lower than the predetermined upper limit temperature. Since the temperature of the hot water U1 in the low-temperature hot water reservoir that cools the fuel cell system 3 during operation (during power generation) of the fuel cell 3 does not rise above a predetermined upper limit temperature, the cooling capacity of the fuel cell system 3 is secured, A decrease in power generation efficiency can be suppressed.

  Further, by cooling the hot water U1 in the low-temperature hot water storage layer using the blower fan 6a for blowing the combustion air of the hydrogen fuel burner 6 to the combustion chamber 63, the capacity of the hot water storage tank 2 is not excessively increased, and The cooling capacity of the fuel cell system 3 can be ensured without separately providing a cooling device having a cooling and heat radiation mechanism for cooling the fuel cell system. Therefore, the configuration can be simplified, and the required power generation capacity and sufficient hot water supply capacity can be efficiently secured.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and can be appropriately modified and implemented. For example, in the above-described embodiment, the hot and cold water U stored in the hot water storage tank 2 is heated by the heat exchanger 31 and the hydrogen fuel burner 6, but is not limited thereto. It can also be applied in combination with a vessel or the like.

  Further, in the above-described embodiment, the hot water U1 in the low-temperature hot water storage layer U1 is heated by the heat exchanger 31, and the hot water U3 in the high-temperature hot water storage layer U3 is heated by the hydrogen fuel burner 6, but the invention is not limited to this. Instead, the medium-temperature hot water storage layer U2 and the high-temperature hot water storage layer U3 can be appropriately heated by the heat exchanger 31 in consideration of the output of the fuel cell system 3 and the hot water U3 of the high-temperature hot water storage layer U3 can be heated by the hydrogen fuel burner 6. You may do so.

  In this case, the supply port 31d for the tap water W3 is disposed in the middle-temperature hot water storage layer U2 or the high-temperature hot water storage layer U3 above the low-temperature hot water storage layer U1, and the tap water W3 heated by the heat exchanger 31 is pumped. P supplies the medium-temperature hot water storage layer U2 and the high-temperature hot water storage layer U3.

1, 1A Pure hydrogen type hot water storage unit 2 Hot water storage tank 3 Fuel cell system 4 Hydrogen supply source 5 Control device 6 Hydrogen fuel burner 6a Ventilation fan 21 Water supply port 22 Temperature sensor 23 Flow meter 25 Low temperature hot water storage layer temperature sensor 31 Heat exchanger 32 Fuel Battery 51 Upper limit temperature control means 61 Hydrogen inlet port 62 Burner section 63 Combustion chamber 63a Heat exchange section H1, H2 Hydrogen P pump U Hot water U1 Low temperature hot water storage (hot water)
U2 Medium temperature hot water reservoir (hot water)
U3 High-temperature hot water reservoir (hot water)
W1, W2, W3 tap water

Claims (5)

A fuel cell system for generating a hydrogen and oxygen by chemical reaction,
A hydrogen supply source for supplying the hydrogen to the fuel cell system,
A heat exchanger that heats hot and cold water by heat generated from the fuel cell system,
A hot water storage tank for storing hot water,
A hydrogen fuel burner that heats the hot water by burning hydrogen supplied from the hydrogen supply source;
A pure hydrogen type hot water storage unit comprising:
A high-temperature hot water storage layer provided at an upper portion of the hot water storage tank for discharging the stored hot water;
A low-temperature hot water storage layer comprising hot water stored at the lower part of the hot water storage tank,
A medium-temperature hot-water storage layer provided with the hydrogen fuel burner, located between the low-temperature hot-water storage layer and the high-temperature hot-water storage layer,
A supply port for supplying heated water from the heat exchanger is provided on a side surface of the hot water storage tank and corresponding to the low-temperature hot water storage layer,
A pure hydrogen type hot water storage unit characterized by the following. The supply port is provided below the hydrogen fuel burner;
The pure hydrogen type hot water storage unit according to claim 1, characterized in that: An inflow passage for introducing hot water from the low-temperature hot water storage layer to the heat exchanger is connected to a bottom surface of the hot water storage tank;
The pure hydrogen type hot water storage unit according to claim 1 or 2, wherein: A temperature sensor for measuring the temperature of the hot water stored in the hot water storage tank,
A flow meter for measuring the hot water flow rate of the newly flowing into the hot water has been hot and cold water or the hot water storage tank, from the hot water storage tank,
A control device for controlling the operation;
Further comprising
The control device includes:
Based on the temperature measured by the temperature sensor and the flow rate measured by the flow meter, the amount of heat flowing out of the hot water stored in the hot water storage tank is calculated, and the outflow heat is complemented and stored in the hot water storage tank. Controlling the combustion of the hydrogen fuel burner so that the hot water reaches a predetermined temperature;
The pure hydrogen type hot water storage unit according to any one of claims 1 to 3, characterized in that: A low-temperature hot water reservoir temperature sensor that measures the temperature of hot water stored in the low-temperature hot water reservoir,
A blower fan for blowing the combustion air of the hydrogen fuel burner to a heat exchange unit to heat the hot and cold water,
When the temperature of the hot water in the low-temperature hot water storage layer measured by the low-temperature hot water storage layer temperature sensor becomes equal to or higher than a predetermined upper limit temperature, the blower fan is driven in a state in which the combustion of the hydrogen fuel burner is stopped. Upper limit temperature control means for blowing cooling air to the heat exchange section to cool the hot water in the low temperature hot water storage layer to be lower than the predetermined upper limit temperature,
The pure hydrogen type hot water storage unit according to any one of claims 1 to 4, further comprising:

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