JP6362566B2 - Hydrogen boosting storage system and hydrogen boosting storage system boosting method - Google Patents

Description

  The present invention relates to a hydrogen boost storage system for storing hydrogen that has been boosted by increasing the pressure of hydrogen, and a method for boosting the hydrogen boost storage system.

Renewable energy is expected as a hydrogen energy society and CO ₂ free energy. Electricity generated by renewable energy can be stored in a storage battery or the like, but there is a problem that the stored electricity is discharged. For this reason, it is conceivable to make hydrogen by water electrolysis with renewable energy and store the hydrogen. The stored hydrogen can be retained indefinitely. When necessary, the hydrogen can be used to generate electricity and supply electricity.

In the storage of hydrogen, there is a desire to increase the pressure of hydrogen and store more hydrogen. The principle of a compressor using a hydrogen storage alloy has already been presented in known literature.
For example, the release pressure of metal hydride has the property of increasing with increasing temperature. When hydrogen is absorbed at low temperature and low pressure and then heated to high temperature, high pressure hydrogen can be obtained. The operation principle is shown in FIG. In this example, lanthanum nickel hydride is used to store the hydride in a container, and a heat exchanger is disposed in the container.
For example, as shown in FIG. 12 (a), when cold water of 20 ° C. is passed through the heat exchanger and 0.2 MPa of hydrogen is introduced into the container, LaNi ₅ reacts with hydrogen, and LaNi ₅ H ₆ is generated.
Thereafter, as shown in FIG. 12B, hot water of 80 ° C. is passed through the heat exchanger, and 1.2 MPa of hydrogen is released from the container. Thereby, hydrogen can be pressurized and stored using the hydrogen storage alloy. In addition, a multistage compressor can be made by using many types of alloys having different equilibrium pressures. As an advantage, there is no vibration, and it can be driven with small power by using exhaust heat.

Further, there is a research report of ERGENIC, and it is reported that the pressure can be increased up to about 50 MPa with only a hydrogen storage alloy. In an example of a multi-stage hydrogen storage alloy type hydrogen compressor, the pressure is increased from 21 Psi to 1700 Psi by combining four stages (FIG. 13).
On the other hand, if the temperature range is wide, it is possible to increase the pressure from a low pressure to a high pressure with a single-stage hydrogen storage alloy compressor. For example, by combining cold water at around 0 ° C. and hot water at around 150 ° C., it is possible in principle to increase the pressure from 2 MPa to 35 MPa in a single stage. In a similar example, ERGNIC uses a combustion gas at room temperature and 400 ° C. to achieve a pressure increase from 1 MPa to 35 MPa in a single stage.

  In Patent Document 1, in a compressor system including two hydrogen storage / release containers containing a hydrogen storage alloy, hydrogen remaining in the dead space in the container is recovered in the dead space of the other container, thereby achieving high effective use. A system that can supply high-pressure hydrogen efficiently is proposed. Furthermore, in the system of Patent Document 2, pressure swing adsorption is performed in which hydrogen gas is purified from hydrogen-rich gas and stored in a hydrogen gas storage tank while repeating the steps of adsorption, pressure equalization, pressure reduction, washing, and pressure increase in a plurality of adsorption towers. It describes that a high-purity hydrogen and gas are stored in a storage tank by installing a hydrogen purifier by the method. This method is an apparatus mainly for purifying hydrogen gas.

A generally considered hydrogen storage alloy compressor system will be described with reference to FIG. FIG. 15 shows an example of a PCT diagram of the hydrogen storage alloy used in the MH tank.
In the example shown in FIG. 14, two MH tanks are provided, and by operating a valve, a high-temperature medium (80 ° C.) is caused to flow into the MH tank (1) previously absorbed with hydrogen, and the hydrogen stored in the MH tank (1) is stored. The hydrogen pressure is increased by heating the storage alloy, and hydrogen is supplied to the storage tank side installed separately from the MH tank.
On the other hand, the MH tank (2) is cooled with cooling water and absorbs low-pressure hydrogen gas. By switching the valves of the hydrogen absorption, pressure increase and hydrogen supply operations, low pressure hydrogen can be absorbed continuously, and the pressure can be continuously increased to supply hydrogen gas to the storage tank side.

JP 2003-227598 A JP 2007-269526 A

However, a conventional hydrogen storage alloy container of a compressor using a hydrogen storage alloy is separated from a tank for storing hydrogen, and is a system in which a mechanical compressor is simply replaced. In the case of a system in which pressurized hydrogen is stored in a storage tank, this storage tank requires a large tank, requires a large installation space, and increases the tank weight.
In addition, the hydrogen storage alloy container used in the conventional compressor requires a container structure with good heat transfer in order to increase the pressurization speed, but there is a problem that the possibility of damage to the heat transfer section increases as the hydrogen pressure increases. . Further, the container outer cylinder of the hydrogen storage alloy container becomes a pressure resistant container, which increases the cost. Furthermore, there is a problem that the system becomes complicated and the loss of hydrogen-based piping increases.

  The present invention has been made to solve the above-described conventional problems, and by incorporating a hydrogen storage alloy container in a hydrogen storage tank, an external compressor is unnecessary, and the system is simplified and highly reliable. One object of the present invention is to provide a hydrogen pressure-boosting storage system and a pressure-boosting method for boosting hydrogen with low power and storing it in a large capacity and compactly.

  That is, in the hydrogen boosted storage system of the present invention, the first form is a hydrogen storage tank, a hydrogen storage alloy container installed on the inner wall of the hydrogen storage tank and containing a hydrogen storage alloy, and the hydrogen storage alloy. A hydrogen moving part that selectively communicates the internal space of the container and the internal space of the hydrogen storage tank; a hydrogen introduction part that introduces hydrogen into the hydrogen storage alloy container from outside the hydrogen storage tank; and an outer wall side of the hydrogen storage tank. And an alloy heat exchanging unit that heats and cools the hydrogen storage alloy.

  In another aspect of the present invention, the hydrogen storage alloy container is configured such that a partial wall portion of the hydrogen storage tank constitutes a partial wall portion of the hydrogen storage alloy container. It is characterized by being.

  Another aspect of the invention of the hydrogen boosted storage system is that, in the present invention of the above aspect, the partial wall portion of the hydrogen storage tank constituting the partial wall portion of the hydrogen storage alloy container is formed of the hydrogen storage tank. The wall thickness is smaller than other wall portions.

  Another aspect of the invention of the hydrogen boosted storage system is characterized in that, in the present invention of the above aspect, an outer surface of a partial wall portion of the hydrogen storage tank constitutes an inner surface of the alloy heat exchange section.

  In another aspect of the present invention, the hydrogen storage alloy container has a pressure-resistant wall portion that partitions the space inside the hydrogen storage tank than the wall portion of the hydrogen storage tank. It is composed of a low material.

  In another aspect of the present invention, the hydrogen pressure increase storage system is configured so as to selectively communicate with the hydrogen moving part in the present invention according to the above-described form, and the space in the hydrogen storage tank from the hydrogen storage alloy container due to a pressure difference. And a check valve for preventing hydrogen from flowing from the space in the hydrogen storage tank into the hydrogen storage alloy container.

  According to another aspect of the invention of the hydrogen pressurized storage system of the present invention, the hydrogen pressure introduced from the outside of the hydrogen storage tank is lower than the final pressure of hydrogen stored in the hydrogen storage tank. Features.

  In another aspect of the invention, the hydrogen storage alloy container has a shape along the inner wall of the hydrogen storage tank, and is 1 / of the inner peripheral length of the hydrogen storage tank. It has a length of 12 to 1/2.

  In another aspect of the invention, the hydrogen storage alloy container has a thickness in the radial direction that is 1/3 to 1/60 of an inner diameter of the hydrogen storage tank. And

  In another aspect of the present invention, the hydrogen boosted storage system has at least two hydrogen storage tanks in the present invention. In each of the hydrogen storage tanks, hydrogen introduction from the outside to the hydrogen storage alloy container, It is characterized by having a control unit that performs switching between hydrogen transfer from the storage alloy container to the inside of the hydrogen storage tank.

The invention of the boosting method of the hydrogen boosting storage system of the present invention is a boosting method of the hydrogen boosting storage system having at least two hydrogen storage tanks of the present invention,
In each hydrogen storage tank, hydrogen is introduced from the outside to the hydrogen storage alloy container, and hydrogen is transferred from the hydrogen storage alloy container to the inside of the hydrogen storage tank.
The hydrogen introduction and the hydrogen transfer are performed while switching between the hydrogen storage tanks.

  According to the present invention, by incorporating the hydrogen storage alloy container into the hydrogen storage tank, the installation efficiency of the system can be increased, and the distance of the hydrogen path from the hydrogen storage alloy container to the hydrogen storage tank can be shortened to reduce the loss. it can. As a result, a highly reliable system can be obtained, and hydrogen can be boosted with low power and stored in a large capacity and in a compact manner.

It is a perspective view which shows the hydrogen storage tank of one Embodiment of this invention. Similarly, it is a side sectional view Similarly, it is a front sectional view. Similarly, it is a plane sectional view of a heat exchanger. It is a front view which shows the hydrogen storage tank of other embodiment of this invention. Similarly, it is a front view showing one of the use states. Similarly, it is a figure which shows the flow of the hydrogen pressure | voltage rise storage system shown in FIG. Similarly, it is a figure which shows a part of flow. Similarly, it is a figure which shows a part of flow. Similarly, it is a figure which shows a part of flow. Similarly, it is a figure which shows a part of flow. It is a figure which shows the pressure | voltage rise operation principle of a prior art example. It is a figure which shows the pressure | voltage rise operation principle in another prior art example. It is a figure which shows the system using the hydrogen storage alloy compressor of another prior art example. It is a PCT diagram of a hydrogen storage alloy.

Below, the hydrogen pressure | voltage rise storage system 1 of one Embodiment of this invention is demonstrated based on FIGS. 1-4.
The hydrogen pressurization storage system 1 has a cylindrical hydrogen storage tank 2 with a lid, in which a hydrogen storage alloy container 3 is installed and attached to an inner wall to be integrated. The hydrogen storage tank 2 is made of a material such as SS material (general rolled material), SUS material (stainless steel material), Al material (aluminum alloy material; for example, JIS A5000 series or 6000 series). High-quality materials are used. The hydrogen storage alloy container 3 is made of a material such as a thin SS material (general structure rolled material), a SUS material (stainless steel material), an Al material (aluminum alloy material; for example, JIS A5000 series or 6000 series). It is made of a material having a pressure resistance lower than that of the material used for the hydrogen storage tank 2. The pressure resistance can be evaluated by the magnitude of the pressure difference inside and outside the container. For example, since the pressure difference between the inside and outside of the container of the hydrogen storage tank 2 is large and the pressure difference between the inside and outside of the latter can be reduced, the thin partition wall is sufficient.
A material having low pressure resistance can be obtained by selecting a material or reducing the thickness.

Therefore, the wall 30 on the hydrogen storage tank space side of the hydrogen storage alloy container 3 does not require a pressure-resistant structure as much as the hydrogen storage tank 2, and at least the pressure difference between the hydrogen storage alloy container 3 and the maximum pressure of the hydrogen storage tank 2. As long as it has the strength of the minute, it can be any material that can withstand the cracking pressure of the check valve described later. By selecting the material in the hydrogen storage alloy container 3, the cost of the hydrogen storage alloy container is reduced. Further, even if the partition wall of the hydrogen storage alloy container is broken, hydrogen does not leak to the outside of the hydrogen storage tank 2, and safety is maintained.
The hydrogen storage alloy container 3 has a shape along the cylindrical inner peripheral wall of the hydrogen storage tank 2, and has a length of 1/12 to 1/2 of the cylindrical inner peripheral wall. Moreover, the thickness has the thickness of 1/3-1/60 with respect to the diameter of a cylindrical inner peripheral wall.

A heat exchanger 4 is provided on the outer peripheral wall of the hydrogen storage tank 2 so as to match the shape of the hydrogen storage alloy container 3 or to match the shape of the hydrogen storage alloy container 3 or to completely cover it. Yes. The heat exchanger 4 has a shape along the outer peripheral wall of the hydrogen storage tank 2 and has a medium introduction part 4A and a medium discharge part 4C, and a medium flow path 4B communicating with these is provided inside. Is provided. The heat exchanger 4 corresponds to the alloy heat exchange part of the present invention.
By installing the hydrogen storage tank 2 so that the heat exchanger 4 is located at the bottom, the posture is stabilized, and maintenance and the like are facilitated.

The medium flow paths 4B are staggered in a staggered manner in the direction from the medium introduction part 4A to the medium discharge part 4C on both inner side walls of the heat exchanger 4 facing in the direction along the peripheral surface of the hydrogen storage tank 2. 4D... 4D is installed to constitute a meandering flow path. A large number of partition walls 4D are provided, and the partition wall 4D is a part of the hydrogen storage tank 2 so that the thickness of the wall portion of the hydrogen storage tank, particularly the thickness of the wall portion where the heat exchanger is located. There is an effect that can be further thinned.
The heat exchanger body 4E may be arranged in a container shape with a small thickness so that one surface of the wall is in contact with the outer wall of the hydrogen storage tank 2, and the outer wall surface of the hydrogen storage tank 2 is heated. It may also be used as the inner wall surface of the exchanger body 4E.

Further, a hydrogen moving pipe 5 that connects the inside of the hydrogen storage alloy container 3 and the space S in the hydrogen storage tank 2 is attached to the hydrogen storage alloy container 3, and the hydrogen moving pipe 5 includes the hydrogen storage alloy container 3. A check valve 6 capable of moving gas from the side to the space S in the hydrogen storage tank 2 is provided. The check valve 6 prevents the gas flow from the space S into the hydrogen storage alloy 3 in the hydrogen moving pipe 5. The check valve 6 enables movement of hydrogen gas from the hydrogen storage alloy container 3 side toward the space S at a predetermined pressure. Thereby, the hydrogen storage alloy container 3 and the hydrogen storage tank 2 communicate selectively. Therefore, the hydrogen moving pipe 5 and the check valve 6 constitute a hydrogen moving part of the present invention.
The hydrogen transfer pipe 5 can communicate the space in the hydrogen storage alloy container 3 and the space in the hydrogen storage tank 2 at the shortest distance.

  Further, an external hydrogen pipe 8 is connected to the hydrogen moving pipe 5 so that low-pressure hydrogen gas can be supplied to the hydrogen moving pipe 5. The external hydrogen pipe 8 is provided with an open / close valve (not shown). The external hydrogen pipe 8 may be further connected to the hydrogen storage alloy container 3, and may be configured to supply hydrogen directly to the hydrogen storage tank 2 without being connected to the hydrogen transfer pipe 5.

Next, the operation of the hydrogen boosted storage system 1 will be described.
A predetermined hydrogen storage alloy is accommodated in the hydrogen storage alloy container 3. In the present invention, the type of the hydrogen storage alloy is not particularly limited. For example, AB ₅ , AB ₂ , BCC, AB alloy and the like can be used.

  In the external hydrogen pipe 8, the on-off valve is opened and low-pressure hydrogen is supplied to the hydrogen transfer pipe 5. At this time, in the heat exchanger 4, a cooling medium such as cold water is introduced from the medium introduction part 4A into the medium flow path 4B, and the medium is discharged from the medium discharge part 4C through the medium flow path 4B. Introduced and discharged continuously. By the operation of the heat exchanger 4, the hydrogen storage alloy in the hydrogen storage alloy container 3 is cooled, and the hydrogen introduced into the hydrogen transfer pipe 5 is stored. At this time, the check valve 6 is not opened, and the communication between the hydrogen storage alloy container 3 and the space S is closed.

  When the hydrogen storage for the hydrogen storage alloy is completed, the on-off valve of the external hydrogen pipe 8 is closed, and in the heat exchanger 4, a heating medium such as hot water is introduced from the medium introduction part 4A into the medium flow path 4B, and the medium flow path 4B is passed through. The medium is continuously introduced and discharged so as to be discharged from the medium discharge portion 4C. By the operation of the heat exchanger 4, the hydrogen storage alloy in the hydrogen storage alloy container 3 is heated, and the hydrogen stored in the hydrogen storage alloy is released. The check valve 6 is opened by the release pressure at this time, and the hydrogen in the hydrogen storage alloy container 3 moves to the space S through the hydrogen transfer pipe 5.

Thereafter, the hydrogen storage alloy is cooled by the heat exchanger 4, and low-pressure hydrogen is supplied to the hydrogen transfer pipe 5 through the external hydrogen pipe 8 to store hydrogen in the hydrogen storage alloy container. Thereafter, the hydrogen storage alloy is heated again by the heat exchanger 4, and the pressure-increased hydrogen is supplied into the space S through the hydrogen transfer pipe 5.
By repeating the above steps, hydrogen can be boosted and stored in the space S up to a pressure that can be boosted by the hydrogen storage alloy. In the state where hydrogen is stored in the hydrogen storage tank 2 at a maximum pressure that can be increased, hydrogen can be stored in the hydrogen storage alloy container 3, and the storage efficiency is improved. For this reason, the capacity of the hydrogen storage tank can be reduced.

For example, hydrogen gas of 0.35 MPa can be used and stored in the hydrogen storage tank 2 at a pressure of 0.9 MPa. In order to store 300Nm ³ of hydrogen, an internal volume of 34m ^{3 is} required, the hydrogen storage tank size is a cylindrical shape with a diameter of 2.2 × 9.4m, an installation space of about 20.7m ² , and the material is steel. The mass is about 6.4 ton.

In the above embodiment, the operation of one of the hydrogen storage tanks has been described. However, as shown in FIG. 5, the hydrogen boosted storage system may include two or more hydrogen storage tanks.
Below, 1A of hydrogen pressure | voltage rise storage systems provided with two hydrogen storage tanks are demonstrated.
In this hydrogen pressurization storage system 1A, the hydrogen storage tank 2A, the hydrogen storage alloy container 3A, the heat exchanger 14A, the hydrogen transfer pipe 5A, the check valve 6A, the hydrogen storage tank 2B, the hydrogen storage alloy have the same structure as the previous embodiment. It has a container 3B, a heat exchanger 14B, a hydrogen transfer pipe 5B, and a check valve 6B. An external hydrogen pipe 8 is connected to the hydrogen moving pipes 5A and 5B, and hydrogen can be supplied by selecting one of the hydrogen moving pipes 5A and 5B by operating a valve (not shown).

  In this embodiment, in one hydrogen storage tank (for example, hydrogen storage tank 2A), hydrogen is supplied from the external hydrogen pipe 8 to the hydrogen moving pipe 5A, and the heat exchanger 14A is used as a hydrogen storage alloy with a cooling medium. Is cooled and occludes low-pressure hydrogen with a hydrogen-occlusion alloy. At this time, in the other hydrogen storage tank (for example, the hydrogen storage tank 2B), the heat storage 14B is used to heat the hydrogen storage alloy using a heating medium to release the hydrogen stored in the hydrogen storage alloy. Then, hydrogen is stored in the space S in the hydrogen storage tank 2B through the hydrogen transfer pipe 5B and the check valve 6B.

When the hydrogen release from the hydrogen storage alloy is completed in the hydrogen storage tank 2B, the valve operation in the external hydrogen transfer pipe 8 is changed, and the medium in the heat exchanger 14A is changed from that for cooling to that for heating. The medium in the exchanger 14B is changed from that for heating to that for cooling.
Thereby, in the hydrogen storage alloy container 3A, the hydrogen stored in the hydrogen storage alloy is released, and is released and stored in the space S in the hydrogen storage tank 2A through the hydrogen moving pipe 5A and the check valve 6A. On the other hand, in the hydrogen storage alloy container 3B, hydrogen is stored in the hydrogen storage alloy by cooling by the heat exchanger 14B. By repeating these operations, it is possible to continuously increase the pressure of hydrogen without having a useless stop time and store hydrogen at a predetermined pressure in the hydrogen storage tanks 2A and 2B, respectively. The number of hydrogen storage tanks is not limited to one or two, and an appropriate number of hydrogen storage tanks can be provided.
It should be noted that during the pressurization of hydrogen, as shown in FIG. 6, hydrogen stored in the hydrogen storage tanks 2A and 2B may be supplied to the use side such as a fuel cell.

In the hydrogen pressurized storage system 1A of FIG. 5, for example, in order to store 300 Nm ³ of hydrogen at a pressure of 0.9 MPa, the internal volume of the hydrogen storage tank is 10 m ³ , respectively. A hydrogen storage alloy container of .8 × 4.2 m is filled with a total of 0.9 ton of AB ₅ alloy. Combined with storage in the hydrogen storage alloy container, 300 Nm ³ of hydrogen is stored in the hydrogen storage tank. Further, the installation space is about 15.2 m ² , and the total weight is about 4.5 ton, and both the installation space and the weight are reduced.
The alloy of the hydrogen storage alloy container is used for 0.9 ton, and by effectively using the area of the bottom surface of the hydrogen storage tank, the thickness of the alloy layer can be reduced to 35 mm, so that the heat conductivity can be improved. Further, by providing ribs to reduce the plate thickness, the plate thickness can be made 5 mm or less.
Inside the heat exchanger, the flow path area can be designed so that the flow rate of the medium is 0.3 to 1.5 m / sec and the temperature difference between the inlet and outlet of the medium is 5 ° C. or less.
In addition, the above is an illustration and does not limit the present invention.

Next, FIG. 7 shows a flow chart of the hydrogen boosted storage system shown in FIG. In this figure, the hydrogen storage alloy container and the hydrogen storage tank are shown separated from each other for easy explanation. However, as shown in FIG. 5, the hydrogen storage alloy container is installed in the hydrogen storage tank. It is what.
Hydrogen storage alloy containers 3A and 3B (shown as MH tanks A and B in the figure, the same below) are respectively placed in the internal spaces of the hydrogen storage tanks 2A and 2B (shown as storage tanks A and B in the figure and the same below). The hydrogen transfer pipes 5A and 5B communicate with each other through check valves 6A and 6B. The check valves 6A and 6B allow gas movement from the hydrogen storage alloy containers 3A and 3B to the hydrogen storage alloy tanks 2A and 2B, and prevent gas movement in the opposite direction. The external hydrogen pipe 8 is branched into two paths via check valves 8A and 8B and connected to the hydrogen storage alloy containers 3A and 3B and the hydrogen transfer pipes 5A and 5B. In this connection, the hydrogen storage alloy containers 3A and 3B are connected to the check valves 6A and 6B.

The hydrogen storage alloy containers 3A and 3B have introduction pipes 30A and 30B connected to the medium introduction port and discharge pipes 31A and 31B connected to the medium discharge port in the heat exchanger, and each has an introduction side on-off valve 32A. , 32B, and discharge side on-off valves 33A, 33B are interposed.
The introduction pipe 30A branches into two paths and is connected to the C port of the water supply side three-way valve 40 on the warm water tank 60 side and the C port of the water supply side three way valve 50 on the cooling water supply source 70 side.
The discharge pipe 31A branches into two paths and is connected to the B port of the return side three-way valve 41 on the warm water tank 60 side and the C port of the return side three way valve 51 on the cooling water supply source 70 side.
The introduction pipe 30B branches into two paths and is connected to the B port of the water supply side three-way valve 40 on the warm water tank 60 side and the B port of the water supply side three way valve 50 of the cooling water supply source.
The discharge pipe 31B is branched into two paths and connected to the C port of the return side three-way valve 41 of the hot water tank 60 and the B port of the return side three way valve 51 on the cooling water supply source 70 side.

One end of a hot water supply path 45 is connected to the hot water tank 60, and a pump 46 and a flow rate adjustment valve 47 are interposed in the hot water supply path 45. The other end of the hot water supply path 45 is connected to the A port of the water supply side three-way valve 40.
Further, one end of the hot water circulation channel 48 is connected to the hot water tank 60, and the other end is connected to the A port of the return side three-way valve 41.
A cooling water supply path 55 is connected to the cooling water supply source 70, and a pump 56 is interposed in the cooling water supply path 55. The other end of the cooling water supply path 55 is connected to the A port of the water supply side three-way valve 50.
Further, one end of the annular flow path 57 is connected to the cooling water supply source 70, and the other end is connected to the A port of the return side three-way valve 51.

Next, the operation of the hydrogen boosted storage system will be described with reference to FIGS. In this example, the low-pressure hydrogen is 0.35 MPa. However, the present invention is not limited to this.
First, as shown in FIG. 8, when the internal pressures of the hydrogen storage alloy containers 3A and 3B and the hydrogen storage tanks 2A and 2B are less than 0.35 MPa, low-pressure hydrogen (0.35 MPa) sent from water electrolysis or the like is used. , And sent directly to the storage tanks 2A and 2B via the check valves 8A and 8B. In parallel with this, the hydrogen storage alloy container 3A is cooled to absorb hydrogen. Although the hydrogen storage alloy container 3B is not cooled, a small amount of hydrogen is absorbed.

Subsequently, in the cycle A shown in FIG. 9, the heating medium is caused to flow from the hot water tank 60 to the hydrogen storage alloy container 3A. Specifically, in the water supply side three-way valve 40, the A port and the C port are communicated, the B port is closed, and in the return side three way valve 41, the A port and the B port are communicated, and the C port is closed.
As a result, warm water (80 ° C.) is sent to the warm water supply path 45 by the pump 46, the flow rate is adjusted by the flow rate adjusting valve 47, the ports A and C are passed by the water supply side three-way valve 40, the introduction pipe 30A, the introduction side Hot water is introduced into the medium introduction side of the heat exchanger via the on-off valve 32A. The hot water is discharged from the medium discharge port through the medium flow path of the heat exchanger, passes between the discharge pipe 31A, the discharge side on-off valve 33A, and the ports B and A of the return side three-way valve 41A, and passes through the hot water ring flow path 48. And flows back to the hot water tank 60.
When the pressure in the hydrogen storage alloy container 3A is increased by heating with the hot water and the pressure becomes higher than the internal pressure of the hydrogen storage tank 2A, hydrogen flows from the hydrogen storage alloy container 3A to the hydrogen storage tank 2A via the check valve 6A. .

  On the other hand, the hydrogen storage alloy container 3B absorbs low-pressure hydrogen sent from water electrolysis or the like by flowing a cooling medium. Specifically, cooling water (32 ° C.) is flowed from the cooling water supply source 70 to the cooling water supply passage 55, the A port and the B port of the water supply side three-way valve 50 are communicated, and the C port is closed. Thereby, the cooling water is introduced to the medium introduction side of the heat exchanger through the introduction path 30B. The cooling water is discharged from the medium discharge port through the medium flow path of the heat exchanger, passes through the discharge pipe 31B, the discharge side on-off valve 33B, and between the ports B and A of the return side three-way valve 51, and returns to the cooling water circulation. It flows to the path 57 and circulates to the cooling water supply source 70.

Subsequently, the cycle B shown in FIG. 10 is the reverse of the cycle A, and when the pressure is increased by flowing a heating medium into the hydrogen storage alloy container 3B and becomes higher than the internal pressure of the hydrogen storage tank 2B, the hydrogen storage tank is passed through the check valve 6B. Hydrogen flows through 2B. On the other hand, the hydrogen storage alloy container 3A absorbs low-pressure hydrogen sent from water electrolysis or the like by flowing a cooling medium.
At this time, in the water supply side three-way valve 40, the A port and the B port are communicated, the C port is closed, and in the return side three way valve 41, the A port and the C port are communicated, and the B port is closed.
As a result, warm water (80 ° C.) is sent to the warm water supply path 45 by the pump 46, the flow rate is adjusted by the flow rate adjusting valve 47, passes through the ports A and B by the water supply side three-way valve 40, and the introduction pipe 30B and the introduction side. Hot water is introduced to the medium introduction side of the heat exchanger via the on-off valve 32B. The hot water is discharged from the medium discharge port through the flow path of the heat exchanger, passes through the discharge pipe 31B, the discharge side on-off valve 33B, and between the ports C and A of the return side three-way valve 41A, and enters the hot water ring flow path 48. It flows and recirculates to the hot water tank 60.
When the pressure in the hydrogen storage alloy container 3B is increased by heating with the hot water and the pressure becomes higher than the internal pressure of the hydrogen storage tank 2B, hydrogen flows from the hydrogen storage alloy container 3B to the hydrogen storage tank 2B via the check valve 6B. .

On the other hand, the hydrogen storage alloy container 3A absorbs low-pressure hydrogen sent from water electrolysis or the like by flowing a cooling medium. Specifically, cooling water (32 ° C.) is caused to flow from the cooling water supply source 70 to the cooling water supply path 55. At this time, in the water supply side three-way valve 50, the ports A and C are communicated and the B port is closed.
In the return side three-way valve 51, the ports A and C are communicated and the B port is closed.
Thereby, the cooling water is introduced to the medium introduction side of the heat exchanger through the introduction path 30A. The cooling water is discharged from the medium discharge port through the flow path of the heat exchanger, passes between the discharge pipe 31A, the discharge side on-off valve 33A, and the ports C and A of the return side three-way valve 51, and passes through the cooling water ring flow path. It flows to 57 and circulates to the cooling water supply source 70.

Subsequently, as shown in FIG. 11, when the pressures of the hydrogen storage tank 2A and the hydrogen storage tank 2B reach 0.9 MPa or more, the two hydrogen storage alloy containers 3A and the hydrogen storage alloy container 3B are alternately arranged in the same manner as described above. Flowing cooling water and storing hydrogen at low pressure completes.
As a result, the hydrogen pressure inside the hydrogen storage tank 2A and the hydrogen storage tank 2B is 0.9 MPa, and a total of about 180 Nm ³ of hydrogen is stored. Further, since hydrogen is stored in the hydrogen storage alloy containers 3A and B at a temperature of 30 ° C. or less at a low pressure (0.35 MPa), the hydrogen storage amount is 150 cc / g or more as shown in the PCT diagram of FIG. In total, about 120 Nm ³ of hydrogen is stored. About 300 Nm ³ of hydrogen is stored by combining the hydrogen in the storage tank and the MH tank.

  As mentioned above, although this invention was demonstrated based on the said embodiment, an appropriate change is possible unless it deviates from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Hydrogen pressurization storage system 2, 2A, 2B Hydrogen storage tank 3, 3A, 3B Hydrogen storage alloy container 4 Heat exchanger 4A Medium introduction part 4B Medium flow path 4C Medium discharge part 4D Partition 60 Hot water tank 70 Cooling water supply source

Claims (11)

A hydrogen storage tank;
A hydrogen storage alloy container installed on the inner wall of the hydrogen storage tank and containing a hydrogen storage alloy; and
A hydrogen moving part for selectively communicating the internal space of the hydrogen storage alloy container and the internal space of the hydrogen storage tank;
A hydrogen introduction part for introducing hydrogen into the hydrogen storage alloy container from the outside of the hydrogen storage tank;
An hydrogen heat boosting storage system, comprising: an alloy heat exchanging unit that is installed on the outer wall side of the hydrogen storage tank and that heats and cools the hydrogen storage alloy.   2. The hydrogen boosted storage system according to claim 1, wherein the hydrogen storage alloy container has a partial wall portion of the hydrogen storage tank constituting a partial wall portion of the hydrogen storage alloy container.   The partial wall portion of the hydrogen storage tank constituting the partial wall portion of the hydrogen storage alloy container is smaller in thickness than the other wall portion of the hydrogen storage tank. Item 3. The hydrogen boosted storage system according to Item 2.   The hydrogen boosted storage system according to any one of claims 1 to 3, wherein an outer surface of a partial wall portion of the hydrogen storage tank constitutes an inner surface of the alloy heat exchange unit.   The said hydrogen storage alloy container, The wall part which partitions off the said hydrogen storage tank inner space is comprised with the material whose pressure | voltage resistance is lower than the wall part of the said hydrogen storage tank, The characterized by the above-mentioned. The hydrogen pressure | voltage rise storage system of any one.   The hydrogen moving part is configured to selectively communicate with the hydrogen moving part by allowing a hydrogen flow from the hydrogen storage alloy container to the hydrogen storage tank space by a pressure difference, and from the hydrogen storage tank space to the hydrogen storage tank. The hydrogen boosted storage system according to any one of claims 1 to 5, further comprising a check valve that prevents a hydrogen flow into the alloy container.   The hydrogen boosted storage according to any one of claims 1 to 6, wherein the pressure of hydrogen introduced from outside the hydrogen storage tank is lower than the final pressure of hydrogen stored in the hydrogen storage tank. system.   The hydrogen storage alloy container has a shape along an inner wall of the hydrogen storage tank, and has a length of 1/12 to 1/2 of an inner peripheral length of the hydrogen storage tank. 8. The hydrogen boosted storage system according to any one of 7 above.   The hydrogen boosted storage system according to any one of claims 1 to 8, wherein the hydrogen storage alloy container has a radial thickness of 1/3 to 1/60 of an inner diameter of the hydrogen storage tank. .   A control unit that has at least two hydrogen storage tanks and performs switching between hydrogen introduction from the outside to the hydrogen storage alloy container and hydrogen transfer from the hydrogen storage alloy container to the inside of the hydrogen storage tank in each hydrogen storage tank The hydrogen boosted storage system according to any one of claims 1 to 9, wherein A method for boosting a hydrogen boosted storage system having at least two of the hydrogen storage tanks according to any one of claims 1 to 10,
In each hydrogen storage tank, hydrogen is introduced from the outside to the hydrogen storage alloy container, and hydrogen is transferred from the hydrogen storage alloy container to the inside of the hydrogen storage tank.
A method of boosting a hydrogen boosted storage system, wherein the hydrogen introduction and the hydrogen transfer are switched between the hydrogen storage tanks.

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