JPH1082568A - Heat storage device utilizing hydrogen storage alloy and method of operating the same - Google Patents

Abstract

(57) [Summary] To use heat storage for cooling, heat storage of a heat storage device can be used only once. As a result, the heat storage device becomes larger. SOLUTION: First, second, and third MH containers 1, 2, 3, which respectively store hydrogen storage alloys A1, A2, A3, and a first MH container 1 and a second MH container 2, which can communicate with each other.
A hydrogen tube 4, a second hydrogen tube 5 capable of communicating between the second MH container 2 and the third MH container 3, a third hydrogen tube 6 capable of communicating between the third MH container 3 and the first MH container 1, A low-temperature cooling source 7 connected to the 1MH container 1 and cooling the hydrogen storage alloy A1 of the first MH container 1 to a low temperature using nighttime power;
A cold heat utilization device 9 selectively connectable to the MH container 1 or the third MH container 3, a heating source 12 connected to the second MH container 2 for heating the hydrogen storage alloy A2, and a second MH container 2 or the third MH container 3 To the hydrogen storage alloys A2 and A3 at an intermediate temperature between the low-temperature cooling source 7 and the heating source 12.
And a cooling source 10 for cooling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heat storage device utilizing a hydrogen storage alloy and a method of operating the same.

[0002]

2. Description of the Related Art As a conventional heat storage device, there has been known a heat storage device which aims to cut off a peak of daytime power consumption by using nighttime (midnight) power. In this type of heat storage device, heat is stored (cooled) in a heat storage body using nighttime electric power, and this heat storage is effectively used for cooling in the daytime. For example, a relatively large amount of heat storage is realized while saving space by making the heat storage body change phase between solid and liquid and utilizing the property of absorbing heat of fusion at that time.

[0003]

However, in such a conventional heat storage device, when heat storage is used for cooling, the heat storage of the heat storage device can be used only once. As a result, there is a technical problem that the heat storage device must be enlarged in order to secure a long-time cooling action.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional technical problem.
It is as follows. The invention of claim 1 is a hydrogen storage alloy A
1st, 2nd, 3rd M that respectively accommodate 1, A2, A3
H containers 1, 2, 3, a first MH container 1, and a second MH container 2
The first hydrogen pipe 4 capable of communicating with the second MH container 2 and the third hydrogen vessel 5 capable of communicating with the third MH container 3
A third hydrogen pipe 6 capable of communicating between the MH container 3 and the first MH container 1 and the first MH container 1 are connected to cool the hydrogen storage alloy A1 of the first MH container 1 to a low temperature using nighttime electric power. Low-temperature cooling source 7 and first MH container 1 or third MH container 3
, A heating source 12 connected to the second MH container 2 for heating the hydrogen storage alloy A2 of the second MH container 2, and a second MH container 2 or the third MH container 3. To the second MH vessel 2 at an intermediate temperature between the low-temperature cooling source 7 and the heating source 12.
Alternatively, a heat storage device using a hydrogen storage alloy, comprising: a cooling source 10 for cooling the hydrogen storage alloys A2 and A3 of the third MH container 3.

[0005] The invention of claim 2 provides a hydrogen storage alloy A1, A
A first hydrogen tube 4 and a second MH container 2 that can communicate between the first, second, and third MH containers 1, 2, and 3 that respectively accommodate the A 2 and A 3, and the first MH container 1 and the second MH container 2. 3rd MH
A second hydrogen pipe 5 capable of communicating with the vessel 3 and a third hydrogen pipe 6 capable of communicating between the third MH vessel 3 and the first MH vessel 1
And a low-temperature cooling source 7 that is connected to the first MH container 1 and cools the hydrogen storage alloy A1 of the first MH container 1 to a low temperature using nighttime electric power, and either the first MH container 1 or the third MH container 3 A cold heat utilization device 9 that can be connected
A compressor 30 provided between the container 1 and the second MH container 2 for forcibly sending hydrogen in the second MH container 2 into the first MH container 1; and a second MH container 2 or a third MH container 3
And a cooling source 10 for cooling the hydrogen storage alloys A2 and A3 of the second MH container 2 or the third MH container 3 to a temperature higher than the low-temperature cooling source 7. This is a heat storage device using a hydrogen storage alloy.

[0006] The invention according to claim 3 is characterized in that the hydrogen storage alloys A1, A
First, second and third MH containers 1, 2 and 3, respectively housing the first and second MH containers 2, 2 and 3, and the first MH container 1 and the second MH container 2. 3MH
A second hydrogen pipe 5 for communicating with the vessel 3 and a third hydrogen pipe 6 for communicating between the third MH vessel 3 and the first MH vessel 1
And a low-temperature cooling source 7 that is connected to the first MH container 1 and cools the hydrogen storage alloy A1 of the first MH container 1 to a low temperature using nighttime electric power, and either the first MH container 1 or the third MH container 3 Cooling device 9 that can be connected to the second
The hydrogen storage alloy A2 of the second MH container 2 connected to the container 2
Heating source 12 for heating the second MH container 2 or third MH
A cooling source 10 that can be selectively connected to one of the containers 3 and that cools the hydrogen storage alloys A2 and A3 of the second MH container 2 or the third MH container 3 to an intermediate temperature between the low-temperature cooling source 7 and the heating source 12; Using a hydrogen storage alloy utilizing heat storage device equipped with
The hydrogen storage alloy A of the first MH vessel 1 is cooled by the low-temperature cooling source 7.
1 is cooled, and the hydrogen storage alloy A2 of the second MH container 2 is heated by the heating source 12, and the hydrogen released from the hydrogen storage alloy A2 of the second MH container 2 is transferred to the hydrogen storage alloy A1 of the first MH container 1. In the first step of storing, the hydrogen storage alloy A3 in the third MH container 3 is cooled by the cooling source 10 and the hydrogen released from the hydrogen storage alloy A1 in the first MH container 1 is stored in the third MH container 3. A3, occluded in the first MH container 1, and a second step of extracting the cold generated in the first MH container 1 to the cold heat utilization device 9, and the second MH container 2 by the cooling source 10.
Of the hydrogen storage alloy A2 of the third MH container 3
A third step of causing the hydrogen released from the hydrogen storage alloy A3 to be stored in the hydrogen storage alloy A2 of the second MH container 2 and extracting the cold generated in the third MH container 3 to the cold heat utilization device 9. This is an operation method of the heat storage device using the storage alloy.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show one embodiment of a heat storage device using a hydrogen storage alloy according to the present invention. In FIG. 1, reference numerals 1, 2, and 3 denote first, second, and third MH containers that respectively store the hydrogen storage alloys A1, A2, and A3. The hydrogen storage alloys A1, A2, and A3 are arranged in the respective MH containers 1, 2, and 3 by being separated by a filter (not shown) having air permeability, and hydrogen flows into and out of the MH containers 1, 2, and 3. To form a hydrogen space. Here, the hydrogen storage alloys A1, A2, and A3 make the equilibrium pressure different in height.
Depending on the type, for example, a material whose characteristics are controlled by changing the composition of a TiZrCrFeMnNiCu-based alloy can be used. In practice, the equilibrium pressure difference between the hydrogen storage alloy A1 and the hydrogen storage alloy A2 is set to 10 kgf / cm ² or more, and the equilibrium pressure of the hydrogen storage alloy A3 is set to an intermediate pressure. In each of the hydrogen storage alloys A1, A2, A3, the heat medium passages 1a,
2a and 3a are attached.

The first, second, and third MH containers 1, 2, and 3 are connected to each other by first, second, and third hydrogen tubes 4, 5, and 5, respectively.
6 to communicate with each other. The first hydrogen pipe 4 includes a first opening / closing valve 21 and connects between the first MH container 1 and the second MH container 2. The second hydrogen pipe 5 includes a second opening / closing valve 22, and connects between the second MH container 2 and the third MH container 3. The third hydrogen pipe 6 includes a third opening / closing valve 23,
The MH container 1 and the third MH container 3 are connected. In addition,
The first hydrogen pipe 4 may be provided with a compressor 30 for forcibly sending the hydrogen in the second MH container 2 into the first MH container 1.

An air conditioner 9 which is a cold heat utilization device is connected to the heat medium passage 1a of the first MH container 1 through a pair of pipes 40 and 41, and the first MH container 1 is operated using nighttime electric power. The refrigerator 7 is connected as a low-temperature cooling source for cooling the hydrogen storage alloy A1 to a low temperature (7 ° C.). Refrigerator 7
Is a pair of pipes 42, 4 branched from the respective pipes 40, 41.
3, three-way switching valves 50, 51 are provided at the branch points from the pipes 40, 41, which are connected to the heat medium passage 1a of the first MH vessel 1. Three-way switching valve 50, 51
Is a switching position at which the heat medium passage 1a communicates with the air conditioner 9 through the respective pipes 40 and 41, a switching position at which the heat medium passage 1a communicates with the refrigerator 7 through the respective pipes 42 and 43,
And a blocking position for blocking the heat medium passage 1a. Then, by the drive of the pump 62 provided in the pipe 41 close to the first MH container 1, the refrigerator 7 cools down (7 ° C.).
The heat medium thus cooled can be supplied to the first MH container 1, and the heat medium cooled through the heat medium passage 1 a can be supplied to the air conditioner 9.

An air conditioner 9 is connected to the heat medium passage 3a of the third MH container 3 via a pair of pipes 44 and 45.
Actually, each pipe 4 whose one end is connected to the heat medium passage 3a
The other ends of the pipes 4 and 45 are connected to the pipes 40 and 41 via three-way switching valves 52 and 53. Three-way switching valve 52,
Reference numeral 53 denotes a switching position at which the heat medium passage 3a communicates with the air conditioner 9, a switching position at which the heat medium passage 1a communicates with the air conditioner 9, and a shutoff position at which the heat medium passages 1a and 3a are shut off. Thus, the air conditioner 9 can be selectively connected to either the first MH container 1 or the third MH container 3, and is driven by the pump 63 provided in the pipe 45.
The heat medium cooled (7 ° C.) through the heat medium passage 3 a of the MH container 3 can be supplied to the air conditioner 9.

Further, the heat medium passage 3a of the third MH container 3 has a relatively low temperature (20 to 20) through a pair of pipes 46 and 47.
35 ° C.) cooling source 10 is connected. Actually, the pipes 46 and 47 are connected to the respective pipes 44 and 45 near the third MH container 3, and three-way switching valves 54 and 55 are provided at the branch points from the pipes 46 and 47. Three-way switching valve 54,
Reference numeral 55 denotes a switching position in which the heat medium passage 3a communicates with the air conditioner 9 in cooperation with the three-way switching valves 52 and 53, a switching position in which the heat medium passage 3a communicates with the cooling source 10, and shuts off the heat medium passage 3a. Having a blocking position.

The heating source 12 is connected to the heat medium passage 2 a of the second MH vessel 2 via a pair of pipes 48 and 49.
The cooling source 10 is connected to the heat medium passage 2 a of the second MH container 2 via a pair of pipes 38 and 39. In practice, one end of each of the pipes 38, 39 is connected to the three-way switching valve 56,
The other end of each of the pipes 38 and 39 is connected to the intermediate part of each of the pipes 46 and 47 through three-way switching valves 58 and 59. Have been. The three-way switching valves 56 and 57 include a three-way switching valve 5
It has a switching position in which the heat medium passage 2a communicates with the cooling source 10 in cooperation with 8, 59, a switching position in which the heat medium passage 2a communicates with the heating source 12, and a shutoff position in which the heat medium passage 2a is shut off. The three-way switching valves 58 and 59 cooperate with the three-way switching valves 56 and 57 to make the heat medium passage 2a communicate with the cooling source 10, and cooperate with the three-way switching valves 54 and 55 to form the heat medium passage. 3 a has a switching position for communicating with the cooling source 10.

Thus, the cooling source 10 is connected to the second MH vessel 2
Alternatively, it can be selectively connected to one of the third MH containers 3, and is driven by a pump 60 provided in a pipe 47 in close proximity to the cooling source 10, and cooled by the cooling source 10 at a relatively low temperature (20 ° C.). (−35 ° C.) can be selectively supplied to either the second MH container 2 or the third MH container 3. Further, the heating source 12 is connected to the second MH container 2, and is provided with a pump 6 provided in a pipe 49 in proximity to the heating source 12.
1 and driven by the heating source 12 (150 ° C.)
The heated heat medium can be supplied to the heat medium passage 2 a of the second MH container 2. As the cooling source 10, unused waste heat can be used, and a relatively low-temperature (20 to 35 ° C.) heat medium is supplied. As the heating source 12, unused waste heat, an electric heater, or the like can be used.

Next, the operation will be described. Now, the second
It is assumed that hydrogen is stored in the hydrogen storage alloy A2 of the MH container 2. From this state, the first step of recovering sufficient hydrogen in the hydrogen storage alloy A1 of the first MH container 1 is performed. That is, as shown in FIG. 4, the three-way switching valves 50 and 51 are switched, and the refrigerator 7 is driven using the nighttime electric power and the pump 62 is driven, so that the heat medium (7
° C) is introduced into the heat medium passage 1a of the first MH container 1 through a pair of pipes 42, 43 and pipes 40, 41, and the first MH
The hydrogen storage alloy A1 in the container 1 is cooled. At the same time, the three-way switching valves 56 and 57 are switched, and the pump 61 is driven to introduce the heat medium (150 ° C.) from the heating source 12 into the heat medium passage 2 a of the second MH container 2 through the pair of pipes 48 and 49. Then, the hydrogen storage alloy A2 is heated. Further, the first opening / closing valve 21 is opened. Note that the compressor 30 is omitted.

As a result, the hydrogen occluded in the hydrogen storage alloy A2 is released while causing an endothermic reaction, and enters the first MH container 1 through the first hydrogen pipe 4, and the hydrogen storage alloy A1
Is stored while generating an exothermic reaction. The hydrogen storage alloy A2 that causes the endothermic reaction is heated by the heat medium from the heating source 12, and the exothermic reaction of the hydrogen storage alloy A1 is cooled by the heat medium from the refrigerator 7. 1st MH container 1
When sufficient hydrogen has been recovered in the hydrogen storage alloy A1, the pumps 61 and 62 are stopped, and the first opening / closing valve 21 is closed.

The transfer of hydrogen between the second MH container 2 and the first MH container 1 is performed as follows.
That is, in FIG. 2 showing the hydrogen pressure-hydrogen storage amount characteristics, initially, hydrogen is released from the hydrogen storage alloy A2 of the second MH container 2 in a state where sufficient hydrogen has been stored as shown by a point D ′, As indicated by a broken line as '-point E', the hydrogen storage amount gradually decreases while the internal pressure gradually decreases, and the released hydrogen flows into the first MH container 1 through the first hydrogen pipe 4. On the other hand, in the first MH vessel 1, as shown at points F to G, the hydrogen storage amount increases while the internal pressure gradually increases.

The transfer of hydrogen between the second MH container 2 and the first MH container 1 is performed at a high temperature (150 ° C.) as shown in FIG.
From the second MH container 2 in the state of the point XIV at a relatively high pressure and the first M in the state of the point X at a low temperature (7 ° C.) and a relatively high pressure
It is carried out with a slight pressure drop into the H container 1. 2 and 3, the first MH container 1 is MH1 and the second MH
The H container 2 is shown as MH2, and the third MH container 3 is shown as MH3.

By the way, the compressor 30 is operated,
The inside of the second MH container 2 is depressurized and the inside of the first MH container 1 is pressurized to accelerate the release of hydrogen from the hydrogen storage alloy A2, and the released hydrogen can be forcibly stored in the hydrogen storage alloy A1. When the compressor 30 is operated, the three-way switching valves 56, 57, 58 and 59 are switched to connect the second MH container 2 to the cooling source 10, and the pump 60 is driven to be operated by the cooling source 10. The heat medium maintained at a predetermined temperature (20 to 35 ° C.)
a. The movement of hydrogen between the second MH container 2 and the first MH container 1 is caused by the relatively low temperature (20 to 35 ° C.) and low pressure state of the second XH point XIII as shown by a broken line in FIG.
The process is performed from the MH container 2 to the first MH container 1 in a state of a point X at a low temperature (7 ° C.) and a relatively high pressure. As described above, the hydrogen in the second MH container 2 is removed from the first MH container 2 using the compressor 30.
Since hydrogen is forcibly fed into the MH container 1 to generate a pressure difference, even if there is no large temperature difference between the two hydrogen storage alloys A1 and A2 having different equilibrium pressures, hydrogen storage / release is performed. Can be made. The compressor 3
When 0 is provided, the heating source 12, the pump 61, the three-way switching valves 56 and 57, and the like can be omitted. In addition, when the compressor 30 is operated, in FIG. 2, hydrogen is initially released from the hydrogen storage alloy A2 of the second MH container 2 in a state where sufficient hydrogen is stored as shown by a point D,
As shown by the broken lines at points D to E, the hydrogen storage amount gradually decreases while the internal pressure gradually decreases.

Next, a cooling action is obtained in the daytime. First, a cooling action as a second step is obtained. That is, FIG.
By switching the three-way switching valves 54, 55, 58, and 59, the cooling source 10 is connected to the heat medium passage 3a of the third MH container 3 via the pair of pipes 46 and 47, and the pump 60 is driven as shown in FIG. And cooled by the cooling source 10 (20 to 3).
The heat medium (5 ° C.) is introduced into the heat medium passage 3a. Further, the third opening / closing valve 23 is opened. Thereby, the first MH
Hydrogen is released from the hydrogen storage alloy A1 of the container 1 to cause an endothermic reaction to lower the temperature, and the released hydrogen is supplied to the third hydrogen pipe 6
Through the third MH container 3 and is stored in the hydrogen storage alloy A3. From this state, the three-way switching valves 50, 51, 5
2 and 53 are switched, the pump 62 is driven, and the heat medium in the heat medium passage 1a is introduced into the air conditioner 9 through the pair of pipes 40 and 41, whereby the cooling effect of the air conditioner 9 can be obtained. .

The transfer of hydrogen between the first MH container 1 and the third MH container 3 is performed as follows.
That is, in FIG. 2 showing the hydrogen pressure-hydrogen storage amount characteristic, initially, hydrogen is released from the hydrogen storage alloy A1 of the first MH container 1 in a state where sufficient hydrogen is stored as shown by a point G, and points G to As shown by the broken line at point F, the hydrogen storage amount gradually decreases while the internal pressure gradually decreases, and the released hydrogen flows into the third MH container 3 through the third hydrogen pipe 6.
On the other hand, in the third MH container 3, as shown in points H to I, the hydrogen storage amount increases while the internal pressure gradually increases.

The movement of hydrogen between the first MH container 1 and the third MH container 3 is compared with that of the first MH container 1 at a low temperature (7 ° C.) and a relatively high pressure point X as shown in FIG. Of the point XI at a very low temperature (20-35 ° C.) and intermediate pressure
It is performed to the MH container 3.

In this manner, hydrogen is sufficiently released from the hydrogen storage alloy A1 of the first MH container 1, and the hydrogen storage alloy A3
Then, the process proceeds to the cooling operation as the third step. That is, the third on-off valve 23 is closed and the pump 6
0 and 62 are stopped, and the three-way switching valves 52, 53, 54 and 55 are switched as shown in FIG.
The heat medium passage 3 a of the third MH container 3 is connected to the air conditioner 9 via the air holes 4 and 45. At the same time, three-way switching valves 56, 5
7, 58 and 59 are switched to connect the cooling source 10 to the heat medium passage 2a of the second MH vessel 2 via a pair of pipes 38 and 39, and the pump 60 is driven, thereby
The heat medium cooled (20 to 35 ° C.) is introduced into the heat medium passage 2a. Further, the second opening / closing valve 22 is opened.

As a result, hydrogen is released from the hydrogen storage alloy A3 of the third MH container 3 to cause an endothermic reaction to lower the temperature, and the released hydrogen enters the second MH container 2 through the second hydrogen pipe 5 and stores the hydrogen. Occluded in alloy A2. In this state, the pump 63 is driven to introduce the heat medium of the heat medium passage 3a into the air conditioner 9 through the pair of pipes 44, 45, 40, 41, thereby obtaining the cooling effect of the air conditioner 9 subsequently. Can be. This cooling action is obtained until hydrogen is sufficiently released from the hydrogen storage alloy A3 of the third MH container 3.

The transfer of hydrogen between the third MH container 3 and the second MH container 2 is performed as follows.
That is, in FIG. 2 showing the hydrogen pressure-hydrogen storage amount characteristics, initially, hydrogen is released from the hydrogen storage alloy A3 of the third MH container 3 in a state where sufficient hydrogen is stored as shown by a point I ′, and the point I ′ As shown by a broken line as 'to point H', the hydrogen storage amount gradually decreases while the internal pressure gradually decreases, and the released hydrogen flows into the second MH container 2 through the second hydrogen pipe 5. On the other hand, in the second MH container 2, the hydrogen storage amount increases while the internal pressure gradually increases as shown at points E to D.

The transfer of hydrogen between the third MH container 3 and the second MH container 2 is carried out at a relatively low temperature (7 ° C.) and a relatively low pressure, as shown in FIG. (20-35 ° C.) and the low pressure point XIII in the second state
It is performed to the MH container 2.

When sufficient hydrogen has been stored in the hydrogen storage alloy A2 of the second MH container 2, the second opening / closing valve 22 is closed,
Further, the pumps 60 and 63 are stopped. Next, the process returns to the above-described regeneration process as the first process.

As described above, while the hydrogen is repeatedly moved between the hydrogen storage alloy A1 of the first MH container 1, the hydrogen storage alloy A3 of the third MH container 3, and the hydrogen storage alloy A2 of the second MH container 2, Can be supplied with a heat medium lowered to a predetermined temperature (about 7 ° C.). Thus, the cooling operation can be continuously obtained during the daytime while effectively using the nighttime electric power.

[0028]

As will be understood from the above description,
According to the present invention, the following effects can be obtained. That is, three MH containers are used, and hydrogen collected in the first MH container from the second MH container using nighttime power is transferred between the adjacent MH containers via the third hydrogen tube and the second hydrogen tube. Hydrogen transfer is performed in two stages, and a cooling action can be obtained by each hydrogen transfer. As a result, the cooling effect can be effectively obtained by using the hydrogen storage alloy-based heat storage device having a compact structure while effectively using nighttime power.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a heat storage device using a hydrogen storage alloy according to an embodiment of the present invention.

FIG. 2 is a graph showing the hydrogen pressure-hydrogen storage amount characteristic in the same manner.

FIG. 3 is a diagram showing hydrogen pressure-temperature characteristics.

FIG. 4 is an explanatory view of the operation.

FIG. 5 is an explanatory diagram of the same operation.

FIG. 6 is an explanatory view of the operation.

[Explanation of symbols]

1: 1st MH container, 2: 2nd MH container, 1a, 2a, 3
a: heat medium passage, 3: third MH container, 4: first hydrogen tube,
5: second hydrogen pipe, 6: third hydrogen pipe, 7: refrigerator (low-temperature cooling source), 9: air conditioner (cooling heat utilization apparatus), 10: cooling source, 12: heating source, 30: compressor, A1, A2
A3: Hydrogen storage alloy.

Claims (3)

[Claims] 1. A first, second, and third MH containers (1, 2, 2, 3) each containing a hydrogen storage alloy (A1, A2, A3).
3) and a first hydrogen pipe (4) and a second MH vessel (2) capable of communicating between the first MH vessel (1) and the second MH vessel (2).
A second hydrogen pipe (5) capable of communicating between the third MH container (3) and the third hydrogen pipe (6) capable of communicating between the third MH container (3) and the first MH container (1); A low-temperature cooling source (7) connected to the first MH container (1) and cooling the hydrogen storage alloy (A1) of the first MH container (1) to low temperature using nighttime electric power; and the first MH container (1) or A cold heat utilization device (9) selectively connectable to any of the third MH containers (3), and connected to the second MH container (2) to heat the hydrogen storage alloy (A2) of the second MH container (2). Heating source (1
2) and a low-temperature cooling source (7) that can be selectively connected to either the second MH container (2) or the third MH container (3).
A cooling source (10) for cooling the hydrogen storage alloy (A2, A3) of the second MH container (2) or the third MH container (3) at an intermediate temperature between the hydrogen storage alloy and the heating source (12). Heat storage device using storage alloy. 2. A first, second, and third MH containers (1, 2, 2, 3) each containing a hydrogen storage alloy (A1, A2, A3).
3) and a first hydrogen pipe (4) and a second MH vessel (2) capable of communicating between the first MH vessel (1) and the second MH vessel (2).
A second hydrogen pipe (5) capable of communicating between the third MH container (3) and the third hydrogen pipe (6) capable of communicating between the third MH container (3) and the first MH container (1); A low-temperature cooling source (7) connected to the first MH container (1) and cooling the hydrogen storage alloy (A1) of the first MH container (1) to low temperature using nighttime electric power; and the first MH container (1) or A second MH container (2) provided between the first MH container (1) and the second MH container (2), and a cold heat utilization device (9) selectively connectable to one of the third MH containers (3); Hydrogen in 1M
H (1)
0) and a low-temperature cooling source (7) that can be selectively connected to either the second MH container (2) or the third MH container (3).
And a cooling source (10) for cooling the hydrogen storage alloy (A2, A3) of the second MH container (2) or the third MH container (3) to a higher temperature. 3. The first, second, and third MH containers (1, 2, 2, 3) each storing a hydrogen storage alloy (A1, A2, A3).
3) and a first hydrogen pipe (4) for communicating between the first MH container (1) and the second MH container (2); a second MH container (2)
A second hydrogen pipe (5) for communicating between the third MH vessel (3) and the third MH vessel (3), and a third hydrogen pipe (6) for communicating between the third MH vessel (3) and the first MH vessel (1); A low-temperature cooling source (7) connected to the 1MH vessel (1) and cooling the hydrogen storage alloy (A1) of the first MH vessel (1) to low temperature using nighttime electric power; and a first MH vessel (1) or a third MH. A cold heat utilization device (9) selectively connectable to one of the containers (3); and a heating source connected to the second MH container (2) and heating the hydrogen storage alloy (A2) of the second MH container (2). (1
2) and a low-temperature cooling source (7) that can be selectively connected to either the second MH container (2) or the third MH container (3).
And a cooling source (10) for cooling the hydrogen storage alloy (A2, A3) of the second MH container (2) or the third MH container (3) to an intermediate temperature between the heat source and the heating source (12). The hydrogen storage alloy (A1) of the first MH vessel (1) is cooled by the low-temperature cooling source (7) and the hydrogen storage alloy (2) of the second MH vessel (2) is cooled by the heating source (12). A2) is heated to store the hydrogen released from the hydrogen storage alloy (A2) of the second MH container (2) in the hydrogen storage alloy (A1) of the first MH container (1); ), The hydrogen storage alloy (A3) in the third MH container (3) is cooled, and hydrogen released from the hydrogen storage alloy (A1) in the first MH container (1) is stored in the third MH container (3). Cold heat generated in the first MH container (1) caused to be absorbed by the alloy (A3) A second step of taking out the cold utilization device (9), to cool the hydrogen storage alloy (A2) of the cooling source by the (10) connexion first 2MH container (2), third
The hydrogen released from the hydrogen storage alloy (A3) of the MH container (3) is stored in the hydrogen storage alloy (A2) of the second MH container (2), and the cold generated in the third MH container (3) is used as a cold heat utilization device (9). ), A third step of extracting the hydrogen storage alloy-based heat storage device.