JP6924099B2 - Hydrogen storage system, control program and energy supply system - Google Patents

Description

The present invention relates to a hydrogen storage system, a control program and an energy supply system that stores and releases hydrogen in a hydrogen storage alloy using a heat medium.

For example, as an energy supply using hydrogen, hydrogen produced using the power of renewable energy is stored in a hydrogen storage alloy, and hydrogen is released from the hydrogen storage alloy when necessary for fuel cells and the like. A hydrogen storage system that supplies hydrogen is being considered. In this renewable energy, natural energy such as solar power or wind power has output fluctuations and cannot stably supply electric power. Therefore, it is necessary to produce hydrogen with surplus electric power and store it in a hydrogen storage alloy.
In a system using a hydrogen storage alloy, when supplying (releasing) hydrogen to a fuel cell or the like, it is necessary to flow hot water from a hot water unit or the like into a hydrogen storage alloy container to heat the hydrogen storage alloy and increase the container pressure. .. On the other hand, when absorbing hydrogen from a water electrolyzer or the like, it is necessary to operate a cold water chiller (cooler) or the like to flow cold water into a hydrogen storage alloy container to cool the hydrogen storage alloy and lower the container pressure.
In the conventional system, two types of heat media are prepared, and in cooling and heating of the hydrogen storage alloy, an electric valve provided in the heat medium path to switch the heat medium switches the path through which each heat medium moves. I try to use different heat media.

The outline of this system will be described with reference to FIG.
In the system, a plurality of hydrogen storage alloy containers 70 ... 7X are installed in parallel, and the hydrogen introduction path 80 and the hydrogen transfer path 81 are connected in parallel to each of the hydrogen storage alloy containers 70 ... 7X on the downstream side. The hydrogen introduction paths 80 are merged at, and the hydrogen transfer paths 81 are also merged on the downstream side. Further, heat medium transfer paths are connected to the hydrogen storage alloy containers 70 ... 7X, respectively, and the respective inlet side heat medium transfer paths 60B, 61B ... 6XB merge with each other via the solenoid valve 58 and the pump 54. It is connected to the cold water tank 51, and is also connected to the hot water tank 52 via the solenoid valve 59 and the pump 55.
Further, the respective outlet side heat medium moving paths 60A ... 6XA join the hydrogen storage alloy container 70 ... 7X, are connected to the cold water tank 51 via the solenoid valve 56, and are also connected to the cold water tank 51 via the solenoid valve 57, and the hot water tank 52 also via the solenoid valve 57. It is connected to the.

A cooler 50 is connected to the cold water tank 51, and a heater 52A is provided to the hot water tank 52 so that the heat medium can be cooled and heated, respectively.
When hydrogen storage is performed in the hydrogen storage alloy containers 70 ... 7X, hydrogen is introduced into each hydrogen storage alloy container by the hydrogen introduction path 80, and the electromagnetic valves 56, 58 and the pump 54 are operated to use cold water as a heat medium. , A heat medium is circulated between the cold water tank 51 and each hydrogen storage alloy container. On the other hand, when hydrogen is released from the hydrogen storage alloy containers 70 ... 7X, the hydrogen transfer path 81 enables hydrogen to be released from each hydrogen storage alloy container, and the electromagnetic valves 57, 59 and the pump 55 are operated to operate the heat medium. The heat medium is circulated between the hot water tank 52 and each hydrogen storage alloy container. By the above operation, it becomes possible to repeatedly absorb and release hydrogen.

Further, in the above system, it is necessary to control the hydrogen release. For example, it is necessary that the internal pressure of the hydrogen storage alloy container does not exceed the allowable pressure of the pressure resistant container. In Patent Document 1, when the internal pressure of the hydrogen storage alloy container exceeds a predetermined pressure, a means is taken to control the flow of the heat exchange medium into the hydrogen storage alloy container to reduce the internal pressure of the hydrogen storage alloy container. .. Specifically, the flow rate of the heat exchange medium in the heat exchange medium distribution path is reduced, and a minute amount of heat exchange medium is continuously distributed to suppress the rapid release of hydrogen from the hydrogen storage alloy. ..

Japanese Unexamined Patent Publication No. 5-18259

However, in the prior art, it is necessary to prepare two types of heat media and switch the path of the heat medium for absorption and release of hydrogen. Therefore, each pump for flowing different heat media and an electric motor for switching the heat medium. There is a problem that a valve, a heat medium path, etc. are required, the system becomes complicated, and the equipment cost increases.
Further, a path for moving heat media having significantly different temperatures is required, and there is a problem that sensible heat loss is large when the heat medium is switched.

The present invention has been made to solve the problems of the conventional ones as described above, and is a hydrogen storage system, a control program, and an energy capable of efficiently storing and releasing hydrogen by simplifying the device configuration. One of the purposes is to provide a supply system.

That is, the first form of the hydrogen storage system of the present invention includes a hydrogen storage alloy container in which a hydrogen storage alloy is housed, a hydrogen introduction path for introducing hydrogen into the hydrogen storage alloy container from the outside, and a hydrogen storage passage.
A hydrogen transfer path for transferring hydrogen from the inside of the hydrogen storage alloy container to the outside, and a heat medium transfer path for which a heat medium that is partially installed in the hydrogen storage alloy container and conducts heat transfer with the hydrogen storage alloy moves. And a temperature adjusting unit for adjusting the temperature of the heat medium moving in the heat medium moving path.
The temperature adjusting unit, and a heat medium cooling unit for cooling the heat medium, a heat medium heating unit for heating the heat medium and leisurely,
It is possible to simultaneously introduce hydrogen and transfer hydrogen to one hydrogen storage alloy through the hydrogen introduction path and the hydrogen transfer path.
A pressure measuring unit for measuring the pressure in the hydrogen storage alloy container is provided, and a control unit for receiving the measurement result of the pressure measuring unit and controlling the operation of the temperature adjusting unit based on the measurement result is provided.
When the pressure measured by the pressure measuring unit falls below the first predetermined pressure, the control unit controls the temperature adjusting unit to heat the temperature of the heat medium, and the pressure is higher than the first predetermined pressure. When a large second predetermined pressure is exceeded, the temperature adjusting unit controls the temperature of the heat medium to be cooled, and after heating the heat medium, the pressure measured by the pressure measuring unit is higher than the first predetermined pressure. When the pressure becomes higher than the third predetermined pressure, which is lower than the second predetermined pressure, the heating of the heat medium is stopped, and after the heat medium is cooled, the pressure measured by the pressure measuring unit becomes the second predetermined pressure. It is characterized in that when the pressure becomes lower than the third predetermined pressure and lower than the fourth predetermined pressure, the cooling of the heat medium is stopped .

The invention of another form of the hydrogen storage system is characterized in that, in the present invention of the above-mentioned form, the heat medium transfer path is composed of a circulation path.

The invention of another form of the hydrogen storage system is characterized in that, in the present invention of the above-mentioned form, the heat medium transfer path is composed of one system.

Another aspect of the invention of the hydrogen storage system is characterized in that, in the present invention of the above-described embodiment, the operating temperature of the heat medium is set within a temperature range of ± 10 ° C.

The invention of another form of the hydrogen storage system is characterized in that, in the present invention of the above-described embodiment, it has a heat medium temperature measuring unit for measuring the temperature of the heat medium.

In the invention of the present invention of the other form, the control unit receives the measurement result of the heat medium temperature measuring unit and controls the operation of the temperature adjusting unit based on the measurement result. and wherein and Turkey.

In the invention of another form of the hydrogen storage system, in the present invention of the above-described embodiment, an operating valve that operates independently of the hydrogen introduction path and the hydrogen transfer path is provided, and hydrogen is generated by the operation of the operating valve. It is characterized in that the introduction of hydrogen and the transfer of hydrogen can be performed at the same time.

The invention of another form of the hydrogen storage system is characterized in that, in the present invention of the above form, the hydrogen introduction path is connected to a hydrogen generator that generates hydrogen by renewable energy.

The invention of the control program of the present invention includes a hydrogen storage alloy container in which a hydrogen storage alloy is housed, a hydrogen introduction path for introducing hydrogen into the hydrogen storage alloy container from the outside, and hydrogen from the inside of the hydrogen storage alloy container to the outside. A hydrogen transfer path for transferring the hydrogen storage alloy, a heat medium transfer path in which a part of the heat medium is installed in the hydrogen storage alloy container and the heat medium for heat transfer to the hydrogen storage alloy moves, and the heat medium transfer path. A temperature control unit that adjusts the temperature of the heat medium and a pressure measurement unit that measures the pressure inside the hydrogen storage alloy container are provided, and hydrogen is introduced into one hydrogen storage alloy by the hydrogen introduction path and the hydrogen transfer path. and transport of hydrogen and, a control program executed by the control unit for controlling the hydrogen storage system Ru can der be performed simultaneously,
Steps to acquire the pressure measured by the pressure measuring unit,
A step of comparing the measured pressure with a first predetermined pressure and a second predetermined pressure greater than the first predetermined pressure.
As a result of the comparison, the measured pressure is the heat medium is cooled by the temperature adjustment unit exceeds the second predetermined pressure, the measured pressure falls below a first predetermined pressure and performing a control of heating the heating medium by the temperature adjustment unit ,
After heating the heat medium, when the measured pressure becomes higher than the first predetermined pressure and lower than the second predetermined pressure and higher than the third predetermined pressure, the heating of the heat medium is stopped and the heat medium is cooled. After that, when the measured pressure becomes lower than the second predetermined pressure and lower than the fourth predetermined pressure higher than the third predetermined pressure, the control unit executes a step of stopping the cooling of the heat medium. It is characterized by letting it.

The invention of the energy supply system of the present invention is
Energy supply sources using renewable energy and
A hydrogen generator that generates hydrogen using the energy obtained from the energy supply source, the hydrogen storage system of any form that utilizes the hydrogen generated by the hydrogen generator, and storage in the hydrogen storage system. Equipped with a fuel cell power generation device that uses hydrogen
The energy obtained by the energy supply source and the fuel cell power generation device can be supplied to the load side.

As described above, according to the present invention, the temperature of the heat medium can be adjusted in the heat medium moving path, it is not necessary to route the path for each heat medium to configure the device, and the device configuration can be simplified. Has the effect of being.

It is a figure which shows the schematic structure of the hydrogen storage system 1 in one Embodiment of this invention. Similarly, a PCT diagram of an example of a hydrogen storage alloy used in the embodiment is shown. Similarly, it is a flowchart which shows the control procedure of the temperature adjustment of a heat medium in the absorption and release of hydrogen. It is a figure which shows the outline of the energy supply system 150 in one Embodiment of this invention. It is a figure which shows the schematic structure of the hydrogen storage system 1 in the Example of this invention. Similarly, it is a figure explaining the transfer of a heat medium and the transfer of hydrogen in a hydrogen release test. Similarly, it is a graph which shows the time change of hydrogen pressure, hydrogen flow rate, and temperature in a hydrogen release test. Similarly, it is a figure explaining the transfer of a heat medium and the transfer of hydrogen in a hydrogen absorption test. Similarly, it is a graph which shows the time change of hydrogen pressure, hydrogen flow rate, and temperature in a hydrogen absorption test. Similarly, it is a figure explaining the transfer of a heat medium and the transfer of hydrogen in a test in which hydrogen release and hydrogen absorption are performed in parallel. Similarly, it is a graph which shows the time change of hydrogen pressure, hydrogen flow rate, and temperature in the test which performs hydrogen release and hydrogen absorption in parallel. It is a figure which shows the schematic structure of the conventional hydrogen storage system.

Hereinafter, the hydrogen storage system 1 according to the embodiment of the present invention will be described.
The hydrogen storage system 1 includes a plurality of hydrogen storage alloy containers 11, 12 ... 1X, and the hydrogen storage alloy is stored in each container. In this embodiment, the hydrogen storage alloy, MmNiMnCo of AB ₅ type alloy is used. However, in the present invention, not the composition of the hydrogen storage alloy is restricted to AB ₅ alloys, can be used as appropriate materials, for example, can be used as the AB 2, _BCC system.
The hydrogen storage alloy containers 11, 12 ... 1X are provided with alloy temperature measuring units 11A, 12A ... 1XA for measuring the temperature of the contained hydrogen storage alloy, and the alloy temperature measuring units 11A, 12A ... 1XA are measured. The result is transmitted to the control unit 100. The valves 201, 202 ... 20X, 301, 302 ... 30X of each container are always open, and the pressure inside the container is measured by the pressure measuring unit 30.
The inlet side heat medium transfer path 9A and the exit side heat medium transfer path 9B of the heat medium transfer path are connected to the hydrogen storage alloy containers 11, 12 ... 1X, and are moved by the inlet side heat medium transfer path 9A. Depending on the heat medium, heat can be exchanged between the hydrogen storage alloy stored in the hydrogen storage alloy containers 11, 12 ... 1X and the heat medium. The heat medium in which the heat exchange has been performed moves to the water tank 3 through the exit side heat medium moving path 9B.

The inlet heat medium moving paths 9A of the hydrogen storage alloy containers 11, 12 ... 1X merge and are connected to the discharge side of the water tank 3 via the pump 4. The merged heat medium moving path is provided with a medium temperature measuring unit 6 for measuring the temperature of the heat medium moving in the heat medium moving path, and the medium temperature measuring unit 6 transmits the measurement result to the control unit 100. For example, a thermocouple can be used in the medium temperature measuring unit 6. However, in the present invention, the configuration of the medium temperature measuring unit is not limited to a specific one, and for example, the measurement result may be obtained by an electric signal. The same applies to the following medium temperature measuring unit.
Further, the water tank 3 is provided with a heater 3A for heating the water in the water tank 3, and the heater 3A is connected to the control unit 100 in a controllable manner. Further, a heat exchanger 10 using FC exhaust heat is interposed in the inlet heat medium transfer path 9A, and water passing through the inlet heat medium transfer path 9A can be heated as needed. In this embodiment, the heat exchanger 10 may not be provided.

On the other hand, the exit side heat medium moving path 9B merges and is connected to the cooling tower 7. The merged outlet side heat medium moving path 9B is provided with a medium temperature measuring unit 8 for measuring the temperature of the heat medium moving in the heat medium moving path, and the medium temperature measuring unit 8 transmits the measurement result to the control unit 100. It is connected so that it can be done. In the cooling tower 7, the outlet side heat medium moving path 9B is arranged so that heat can be exchanged, and the other end side is extended and connected to the introduction side of the water tank 3 via the medium flow meter 5. The medium flow meter 5 can transmit the measurement result to the control unit 100.
In this embodiment, the heat medium temperature for heating and cooling the hydrogen storage alloy container is set to the same temperature or a temperature difference of about ± 10 ° C., and a water tank and a pump are used in combination. A plurality of pumps may be used in common. The heat medium temperature can be controlled by operating / stopping the heater of the water tank and the cooler incorporated in the piping line.

Further, in each of the hydrogen storage alloy containers 11, 12 ... 1X, the hydrogen introduction path 40 connected to the external hydrogen generator is branched and connected so as to communicate with the internal space, and the valve 201 is connected to each branch path. , 202 ... 20X are provided. Examples of the hydrogen generator include a water electrolyzer that operates with renewable energy obtained from solar cells, wind power generation, and the like. The hydrogen generator is not limited to the water electrolyzer, and an appropriate device such as a natural gas reformer can be used.

An operating valve 31 and a check valve 32 are interposed in the hydrogen introduction path 40, and a pressure measuring unit 30 for measuring the pressure in the hydrogen introduction path 40 is provided. The actuating valve 31 is controllably connected to the control unit 100, and the pressure measuring unit 30 is electrically connected to the control unit 100 so that the measurement result can be transmitted to the control unit 100. The valves 201, 202 ... 20X, 301, 302 ... 30X of each container are always open, and the pressure inside the container is measured by the pressure measuring unit 30.
The operating valve 31 controls the amount of hydrogen introduced in the hydrogen introduction path 40 by adjusting the opening degree or the like. The check valve 32 prevents hydrogen from flowing back to the hydrogen generating side.

Further, in the hydrogen storage alloy containers 11, 12 ... 1X, the hydrogen transfer passage 41 is branched and connected so as to communicate with the internal space, and the branch passages are provided with valves 301, 302 ... 30X, respectively. .. The hydrogen transfer path 41 is connected to a fuel cell facility or the like that consumes hydrogen to consume hydrogen. The connection destination of the hydrogen transfer path 41 is not limited to a specific one, and may be used for storage, combustion, or the like.

In the hydrogen transfer path 41, a filter 33, an operating valve 34, a pressure reducing valve 35, and a check valve 36 are interposed in this order from the side closest to the hydrogen storage alloy container, and the hydrogen transfer path 41 is in the hydrogen transfer path 41. A pressure measuring unit 37 for measuring the pressure is provided, and the measurement result is transmitted to the control unit 100. The filter 33 collects foreign matter so that the foreign matter is not sent to the supply destination of the hydrogen transfer path 41. The operating valve 34 controls the amount of hydrogen transferred in the hydrogen transfer path 41 by adjusting the opening degree or the like. The pressure reducing valve 35 reduces the pressure of the supplied hydrogen and stably supplies hydrogen to the supply side. The check valve 37 prevents the backflow of hydrogen to the hydrogen storage alloy container side.

Further, in each of the hydrogen storage alloy containers 11, 12 ... 1X, a relief gas discharge path 42 is connected, and relief valves 401, 402 ... 40X are interposed in each. The relief gas discharge passage 42 merges and extends to the relief tip on the downstream side. When the pressure inside the hydrogen storage alloy container exceeds a predetermined pressure, the relief gas discharge path 42 relieves the hydrogen in the container to prevent damage to the hydrogen storage alloy container.
The control unit 100 controls the entire hydrogen storage system by receiving the operation control of various instruments and the measurement results of each measurement unit. The control unit 100 includes a CPU, a control program that operates on the CPU, a ROM, a non-volatile memory that holds various setting contents, a RAM that serves as a work area, and the like. In this embodiment, the control unit 100 has been described as being incorporated in the hydrogen storage system, but the hydrogen storage system does not include the control unit and is externally connected to the hydrogen storage system by a network or the like. It is also possible to control the hydrogen storage system by a control unit.

Next, the operation of the hydrogen storage system will be described.
FIG. 2 shows a PCT diagram of the hydrogen storage alloy contained in the hydrogen storage alloy containers 11, 12 ... 1X. In the hydrogen storage system 1, the pressure inside the hydrogen storage alloy container is within the range of Pa and Pd. Hydrogen is absorbed and released in the region.

Next, the operation during absorption and release of hydrogen will be described.
When absorbing hydrogen, the operating valve 31 of the hydrogen introduction path is operated to introduce hydrogen from the outside into the hydrogen storage alloy containers 11, 12 ... 1X. The hydrogen pressure at this time is measured by the pressure measuring unit 30 and transmitted to the control unit 100. Since the temperature of the hydrogen storage alloy rises with the absorption of hydrogen, the cooling tower 7 is operated as necessary to cool water as a heat medium. The operation of the cooling tower 7 is controlled by the control unit 100. At this time, the temperature of water can be set to be cooled with, for example, 20 ° C. as the lower limit. Water passes through the outlet side heat medium transfer path 9B and the inlet side heat medium transfer path 9A, and is introduced into the hydrogen storage alloy containers 11, 12 ... 1X to cool the heated hydrogen storage alloy and increase the hydrogen absorption efficiency. .. At this time, the heater 3A of the water tank 3 is turned off.

On the other hand, when hydrogen is released from the hydrogen storage alloy, the operating valve 34 is operated to enable the release of hydrogen. At this time, the heater 3A of the water tank 3 is operated as necessary to heat the water which is the heat medium. At this time, the temperature of water can be set to heat up to, for example, 25 ° C. Water passes through the outlet side heat medium transfer path 9B and the inlet side heat medium transfer path 9A and is introduced into the hydrogen storage alloy containers 11, 12 ... 1X to heat the hydrogen storage alloy to increase the hydrogen release efficiency. At this time, the cooling tower 7 is turned off.

Further, in this embodiment, it becomes possible to store hydrogen and release hydrogen in parallel.
At this time, the operating valve 31 of the hydrogen introduction path is operated to introduce hydrogen into the hydrogen storage alloy containers 11, 12 ... 1X, the operating valve 34 is operated, the valves 301, 302 ... 30X are opened, and hydrogen is generated. Allows the release of. The valves (201, 202 ... 20X, 301, 302 ... 30X) of each container are always open, and the pressure inside the container is measured by the pressure gauge P (pressure measuring unit 30).
In the above operation, the operation of the cooling tower 7 and the operation of the heater 3A of the water tank 3 are switched as necessary to control the storage and release of hydrogen.

In the above operation, the temperature of water, which is a heat medium, is controlled based on the pressure in the hydrogen storage alloy container as the main control. The control contents will be described below based on the flowchart of FIG. The following procedure is executed under the control of the control unit 100.
After the start of the treatment (A), it is determined whether the measured pressure P in the hydrogen container is larger than the predetermined pressure Pa (step S1). When the measurement pressure is larger than Pa (steps S1 and Y), the operation of the cooler is turned on and the operation of the pump is turned on as cold water supply, the hydrogen storage alloy is cooled, and the process proceeds to step S3. When the measured pressure P is not larger than the predetermined pressure Pa (steps S1 and N), the process proceeds to step S3 without going through step S2. The predetermined pressure Pa corresponds to the second predetermined pressure of the present invention.

In step S3, it is determined whether the measured pressure P is lower than the predetermined pressure Pb (step S3). If the measured pressure is lower than the predetermined pressure Pb (steps S3 and Y), the water cooling is set to OFF and the pump is set to OFF (step S4) in order to stop the cold water supply, and the process proceeds to step S5. When the measured pressure P is not lower than the predetermined pressure Pb (steps S3 and N), the process proceeds to step S5 without going through step S4. The predetermined pressure Pb corresponds to the fourth predetermined pressure of the present invention.

Next, it is determined whether the measured pressure P is lower than the predetermined pressure Pd (step S5). If the measured pressure P is lower than the predetermined pressure Pd (steps S5 and Y), the heater is turned on and the pump is turned on (step S6) in order to supply hot water, and the process proceeds to step S7. When the measured pressure P is not lower than the predetermined pressure Pd (steps S5 and N), the process proceeds to step S7 without going through step S6. The predetermined pressure Pd corresponds to the first predetermined pressure of the present invention.

Next, it is determined whether the measured pressure P is higher than the predetermined pressure Pc (step S7). When the measured pressure P is higher than the predetermined pressure Pc (steps S7 and Y), the pump is turned off and the heater is turned off to stop the hot water supply, and the process proceeds to A (step S8). If the measured pressure P is not higher than the predetermined pressure Pc, the process proceeds to A without going through step s8. The predetermined pressure Pc corresponds to the third predetermined pressure of the present invention.

This control method controls the pump, heater and cooler by pressure based on the PCT diagram of FIG. 2 and the flowchart of FIG. The pressure inside the container is used, and the cooler is controlled in the range of pressures Pa and Pb when absorbing hydrogen, and the heater is controlled in the range of pressures Pc and Pd when releasing hydrogen. As a result, even in the operation of hydrogen absorption only operation, hydrogen release only operation, or hydrogen absorption and hydrogen release operation at the same time, it is not necessary to switch the medium, and the system can be simplified and the control can be simplified.
In this embodiment, the control is simplified by controlling the pump, heater and cooler by the container pressure, and hydrogen absorption into the hydrogen storage tank, hydrogen release from the hydrogen storage tank, or hydrogen absorption and release are performed in parallel. It is possible to provide a hydrogen storage system that can also be performed.

In the above description, the temperature of the heat medium is adjusted by the hydrogen pressure, but in addition to the measurement result of the measurement pressure, the measurement result of the temperature of the heat medium, the measurement result of the temperature of the hydrogen storage alloy, and hydrogen. The temperature of the heat medium may be adjusted based on one or more of the measurement results of the discharge flow rate of the heat medium.

As described above, according to this embodiment, there are the following effects.
-By this control method, the heater power during heating and the cooler power during cooling can be minimized.
-The electric valve for switching media is not required, the system can be simplified, and the equipment cost can be reduced.
-The temperature difference of the heat medium is eliminated, and the sensible heat loss of the hydrogen storage alloy container can be minimized.
・ The control method becomes simple.
-It is also possible to incorporate FC exhaust heat by incorporating a heat exchanger in the heat medium line.

Next, the energy supply system 150 using the hydrogen storage system will be described with reference to FIG.
The energy supply system 150 of this embodiment has a wind power generation device 110A and a solar power generation device 110B as an energy supply source that utilizes renewable energy. In the present invention, either one of the energy supply sources may be used, and the energy supply source is not limited to these, and other appropriate energy supply sources such as biomass and hydroelectric power generation can be used, and the number thereof is not particularly limited.
The energy obtained by the wind power generation device 110A and the solar power generation device 110B is supplied to the load side 140 and the hydrogen production device 120 as electric power. The load side 140 can be applied to an appropriate one such as a city, a factory, or a farm, and the present invention is not limited to a specific one.
The hydrogen production apparatus 120 produces hydrogen, for example, by electrolysis of water. The hydrogen obtained in the hydrogen production apparatus 120 is supplied to the hydrogen storage system 1 and stored. The hydrogen storage system is not limited to the hydrogen storage system 1, and can be changed to an appropriate configuration.
The hydrogen stored in the hydrogen storage system 1 is supplied to the fuel cell power generation device 130 to generate electricity, and can be supplied to the load side 140.
The electric power obtained by the wind power generation device 110A, the solar power generation device 110B, and the fuel cell power generation device 130 can be supplied to the load side 140 by adjusting the respective supply powers.

Next, in order to explain in detail an embodiment of the hydrogen storage system of the present invention, the hydrogen storage system 1A shown in FIG. 5 was prepared.
The same components as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted or simplified. In this figure, the hydrogen storage alloy containers are two hydrogen storage alloy containers 11 and 12, and the hydrogen introduction path and the transfer path connected to the hydrogen storage alloy containers 11 and 12 are described by the same line for convenience. The valves used for the introduction and transfer of hydrogen were commonly set to 501 and 502.
Table 1 shows the specifications of the test container in comparison with the assumed actual machine. The container used for the test is about 1/40 of the size of the actual container, and two containers with ^{a hydrogen storage capacity of about 1 Nm 3 are used.} The hydrogen storage alloy container in the present invention is not limited to either the test container or the actual container, and these are only examples.

First, an example of a hydrogen release test will be described with reference to FIGS. 6 and 7. At this time, it is assumed that hydrogen is occluded in the hydrogen storage alloy.
In the hydrogen storage alloy containers 11 and 12, the hydrogen transfer valves 501 and 502 are opened to enable hydrogen transfer in the hydrogen transfer path 41. When the hydrogen release flow rate is set to 5 NL / min, the vessel pressure and alloy temperature decrease, and when the vessel pressure falls below 0.2 MPaG (Pd), the pump 4 is started, the heater 3A is turned on, and the mixture is heated at 25 ° C. do. Then, the vessel pressure and the alloy temperature rise, and when the vessel pressure exceeds 0.35 MPaG (Pc), the medium pump and the heater are stopped. By flowing or stopping the medium by the container pressure in this way, the pressure required for release is kept and hydrogen is continuously released.

Next, an example of a hydrogen absorption test will be described with reference to FIGS. 8 and 9.
In the hydrogen storage alloy containers 11 and 12, the hydrogen introduction valves 501 and 502 were opened to enable hydrogen introduction in the hydrogen introduction path 40, and specifically, 10 NL / min hydrogen was introduced.
When hydrogen introduction is started, the container pressure and alloy temperature rise, and when the container pressure exceeds 0.6 MPaG (Pa), the cooler 7A is turned on (20 ° C setting), and cold water is discharged by the pump 4 as the outlet heat medium. The hydrogen storage alloy was cooled by circulating in the moving path 9B and the incoming heat medium moving path 9A. When the vessel pressure and the alloy temperature drop and the vessel pressure falls below 0.4 MPaG (Pb), the pump 4 and the cooler 7A are stopped. By flowing or stopping the medium by the container pressure in this way, the pressure difference required for absorption is kept and hydrogen is continuously absorbed.

Next, a test example in which hydrogen absorption and hydrogen release are performed in parallel will be described with reference to FIGS. 10 and 11.
In this test example, in the hydrogen storage alloy containers 11 and 12, the hydrogen introduction and hydrogen transfer valves 501 and 502 were opened to enable hydrogen introduction in the hydrogen introduction path 40 and hydrogen transfer in the hydrogen transfer path 41. Specifically, while introducing hydrogen at 10 NL / min, the hydrogen absorption flow rate was kept constant at 5 NL / min for absorption. On the other hand, for hydrogen release, the hydrogen release flow rate was set to 2.5, 3.5, 4.6 NL / min, and the flow rate was increased every hour to release the hydrogen.
At the initial stage of the test, the absorption flow rate is higher, so the vessel pressure rises, and after 2 hours, the discharge flow rate increases, and the shortage is released from the hydrogen storage alloy container, so that the vessel pressure decreases. Even in this case, the medium pump and the cooler are controlled between the pressures of 0.4 MPaG (Pb) and 0.6 MPaG (Pa) by looking only at the container pressure, and when the discharge exceeds, the pressures are 0.2 MPaG (Pd) and 0. The pump 4 and the heater 3A were controlled between 35 MPaG (Pc), and hydrogen absorption and hydrogen release could be continuously operated.

Although the present invention has been described above based on the above-described embodiment, appropriate changes to the embodiment can be made as long as the invention does not deviate from the scope of the present invention.

1 Hydrogen storage system 1A Hydrogen storage system 3 Water tank 3A Heater 4 Pump 5 Medium flow meter 6 Medium temperature measuring unit 7 Cooling tower 7A Cooler 8 Medium temperature measuring unit 11, 12 ... 1X Hydrogen storage alloy container 30 Pressure measuring unit 37 Pressure Measuring unit 40 Hydrogen introduction path 41 Hydrogen transfer path

Claims (10)

A hydrogen storage alloy container that houses a hydrogen storage alloy,
A hydrogen introduction path for introducing hydrogen from the outside into the hydrogen storage alloy container,
A hydrogen transfer path for transferring hydrogen from the inside of the hydrogen storage alloy container to the outside,
A heat medium moving path in which a part of the heat medium is installed in the hydrogen storage alloy container and the heat medium for heat transfer with the hydrogen storage alloy moves.
A temperature adjusting unit for adjusting the temperature of the heat medium moving in the heat medium moving path is provided.
The temperature adjusting unit, possess a heat medium cooling unit for cooling the heat medium, a heat medium heating unit for heating the heating medium,
It is possible to simultaneously introduce hydrogen and transfer hydrogen to one hydrogen storage alloy through the hydrogen introduction path and the hydrogen transfer path.
A pressure measuring unit for measuring the pressure in the hydrogen storage alloy container is provided, and a control unit for receiving the measurement result of the pressure measuring unit and controlling the operation of the temperature adjusting unit based on the measurement result is provided.
When the pressure measured by the pressure measuring unit falls below the first predetermined pressure, the control unit controls the temperature adjusting unit to heat the temperature of the heat medium, and the pressure is higher than the first predetermined pressure. When a large second predetermined pressure is exceeded, the temperature adjusting unit controls the temperature of the heat medium to be cooled, and after heating the heat medium, the pressure measured by the pressure measuring unit is higher than the first predetermined pressure. When the pressure becomes higher than the third predetermined pressure, which is lower than the second predetermined pressure, the heating of the heat medium is stopped, and after the heat medium is cooled, the pressure measured by the pressure measuring unit becomes the second predetermined pressure. A hydrogen storage system characterized in that control is performed to stop cooling of a heat medium when a pressure lower than a third predetermined pressure and lower than a fourth predetermined pressure is reached. The hydrogen storage system according to claim 1, wherein the heat medium transfer path is composed of a circulation path. The hydrogen storage system according to claim 1 or 2, wherein the heat medium transfer path is composed of one system. The hydrogen storage system according to any one of claims 1 to 3 , wherein the heat medium has an operating temperature set within a temperature range of ± 10 ° C. The hydrogen storage system according to any one of claims 1 to 4 , further comprising a heat medium temperature measuring unit for measuring the temperature of the heat medium. Wherein the control unit, the heat medium subjected to measurement results of the temperature measurement unit, a hydrogen storage system of claim 5, wherein the benzalkonium control the operation of the temperature adjusting unit based on the measurement result. An actuating valve that operates independently of the hydrogen introduction path and the hydrogen transfer path is provided, and the operation of the actuating valve allows hydrogen to be introduced and hydrogen to be transferred at the same time. The hydrogen storage system according to any one of claims 1 to 6, wherein the hydrogen storage system is characterized. The hydrogen storage system according to any one of claims 1 to 7 , wherein the hydrogen introduction path is connected to a hydrogen generator that generates hydrogen by renewable energy. A hydrogen storage alloy container in which a hydrogen storage alloy is housed, a hydrogen introduction path for introducing hydrogen into the hydrogen storage alloy container from the outside, a hydrogen transfer path for transferring hydrogen from the inside of the hydrogen storage alloy container to the outside, and the above. A part is installed in the hydrogen storage alloy container, and the temperature is adjusted between the heat medium transfer path through which the heat medium that transfers heat with the hydrogen storage alloy moves and the heat medium that moves in the heat medium transfer path. A unit and a pressure measuring unit for measuring the pressure in the hydrogen storage alloy container are provided, and hydrogen is introduced and hydrogen is transferred to one hydrogen storage alloy at the same time by the hydrogen introduction path and the hydrogen transfer path. it a control program executed by the control unit for controlling the possible der Ru hydrogen storage system,
Steps to acquire the pressure measured by the pressure measuring unit,
A step of comparing the measured pressure with a first predetermined pressure and a second predetermined pressure greater than the first predetermined pressure.
As a result of the comparison, the measured pressure is the heat medium is cooled by the temperature adjustment unit exceeds the second predetermined pressure, the measured pressure falls below a first predetermined pressure and performing a control of heating the heating medium by the temperature adjustment unit ,
After heating the heat medium, when the measured pressure becomes higher than the first predetermined pressure and lower than the second predetermined pressure and higher than the third predetermined pressure, the heating of the heat medium is stopped and the heat medium is cooled. After that, when the measured pressure becomes lower than the second predetermined pressure and lower than the fourth predetermined pressure higher than the third predetermined pressure, the control unit executes a step of stopping the cooling of the heat medium. A control program characterized by being made to. Energy supply sources using renewable energy and
The hydrogen storage system according to any one of claims 1 to 8 , wherein a hydrogen generator that generates hydrogen using the energy obtained from the energy supply source and a hydrogen storage system that uses the hydrogen generated by the hydrogen generator. ,
It is equipped with a fuel cell power generation device using hydrogen stored in the hydrogen storage system.
An energy supply system capable of supplying the energy obtained by the energy supply source and the fuel cell power generation device to the load side.

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