JP3246632B2 - Hydrogen storage alloy heat pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrogen storage alloy heat pump using a hydrogen storage alloy.

[0002]

2. Description of the Related Art In recent years, a hydrogen storage alloy heat pump has been developed which utilizes heat generation and storage when hydrogen is stored in a hydrogen storage alloy and decomposition heat absorption when hydrogen is released from the hydrogen storage alloy. Conventionally, as such a hydrogen storage alloy heat pump, one disclosed in, for example, JP-A-1-305273 is known.

[0003] Conventionally, two types of heat pumps are known as heat-driven heat pumps: a heat-up type heat pump shown in FIG. 6 and a heat-increasing refrigeration type heat pump shown in FIG.

[0004] In the temperature rising heat pump shown in FIG.
Two types of hydrogen storage alloys M1 and M2 with different equilibrium pressures are used.
This hydrogen storage alloy heat pump is
Storage alloy M2 with T_MPyrolyzed using a heat source at a temperature of
Hydrogen is led to the elemental storage alloy M1 to generate occlusion heat.
To generate the output of Q0, and after the reaction, T _M
The heat source at the temperature of 3 is used again to decompose the hydrogen storage alloy,
Returning hydrogen from storage alloy M1 to hydrogen storage alloy M2 (1) →
The cycle is (2) → (3) → (4).

Further, increasing heat refrigeration heat pump shown in FIG. 7, the hydrogen storage alloy M1 pyrolyzed using a temperature of the heat source of the T _H, lead hydrogen to the hydrogen storage alloy M2, to cause a storage heating, the Then, the hydrogen storage alloy M is heated by a heat source having a temperature of _TL.
2 is thermally decomposed to cause heat absorption of Q0, and after the heat absorption is completed, the cycle of (1) → (2) → (3) → (4) is to return hydrogen from the hydrogen storage alloy M2 to the hydrogen storage alloy M1. ing.

On the other hand, conventionally, as shown in FIG. 8, in the environmental test room 11, it has been required to air-condition the room to a low temperature of about -20.degree. The outside air needs to have a dew point temperature lower than the room temperature in order to prevent frost on the surface of the coil 15 of the air conditioner 13, and in order to dehumidify the outside air, for example, a honeycomb rotor dehumidifier 19 using a rotor 17 is used. Is used.

[0007] A steam or electric heater 21 is used as a heat source for regeneration, while a blincher or the like is used as a cooling heat source for the environmental test chamber 11.
Is supplied with cold brine.

That is, in this type of room air conditioner, a low-temperature heat source is required to cool the room, and a high-temperature heat source is required to perform dehumidification.

[0009]

However, the conventional hydrogen storage alloy heat pump shown in FIGS. 6 and 7 has a problem that it is difficult to simultaneously obtain a low-temperature heat source and a high-temperature heat source.

That is, in the temperature rising type heat pump shown in FIG. 6, the stored heat Q0 of (2) can be used as a high-temperature heat source, but the reaction in the low temperature field of (4) also becomes the stored heat Q3. , (4) cannot be effectively used as a low-temperature heat source.

On the other hand, in the heat-increasing refrigeration heat pump shown in FIG. 7, the decomposition endotherm Q0 of (3) can be used as a low-temperature heat source, but the reaction in the high temperature field of (1) also becomes the decomposition endotherm Q2. Therefore, there is a problem that (1) cannot be effectively used as a high-temperature heat source.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and provides a temperature-raising refrigeration-type hydrogen storage alloy heat pump capable of simultaneously obtaining a high-temperature heat source in a high-temperature field and a low-temperature heat source in a low-temperature field. The purpose is to do.

[0013]

A hydrogen storage alloy heat pump according to the present invention comprises a first and a second hydrogen storage alloy having the lowest hydrogen equilibrium pressure at the same temperature among four types of hydrogen storage alloys having different hydrogen equilibrium pressures. A second low-pressure hydrogen-absorbing alloy heat exchanger, and a hydrogen-absorbing alloy having the second and third lowest hydrogen equilibrium pressures at the same temperature among the four types of hydrogen-absorbing alloys are connected via a heat transfer member to the first chamber and A first and second intermediate-pressure hydrogen storage alloy heat exchanger accommodated in the second chamber; and a first hydrogen storage alloy having the largest hydrogen equilibrium pressure at the same temperature among the four types of hydrogen storage alloys. A first high pressure hydrogen storage alloy heat exchanger, and a first chamber connecting the first chamber of the first intermediate pressure hydrogen storage alloy heat exchanger and the first low pressure hydrogen storage alloy heat exchanger. A hydrogen transfer line, and the first A second hydrogen transfer line connecting the second chamber of the intermediate pressure hydrogen storage alloy heat exchanger and the first high pressure hydrogen storage alloy heat exchanger; and a second intermediate pressure hydrogen storage alloy heat exchange A third hydrogen transfer line connecting the first chamber of the heat exchanger and the second low pressure hydrogen storage alloy heat exchanger, and the second chamber of the second intermediate pressure hydrogen storage alloy heat exchanger. A high-temperature heat source for extracting a high-temperature heat source by heat exchange between a fourth hydrogen transfer pipe connecting the second high-pressure hydrogen storage alloy heat exchanger and the first and second low-pressure hydrogen storage alloy heat exchangers; A low-temperature heat source extraction pipe for extracting a low-temperature heat source by heat exchange between a heat source extraction pipe and the first and second high-pressure hydrogen storage alloy heat exchangers; a first low-pressure hydrogen storage alloy heat exchanger; Removal of high and low temperature heat sources from the first high pressure hydrogen storage alloy heat exchanger During, and performs heating of the first chamber of the second low pressure hydrogen absorbing alloy heat exchanger and the first intermediate pressure hydrogen absorbing alloy heat exchanger,
When removing the high-temperature heat source and the low-temperature heat source from the second low-pressure hydrogen storage alloy heat exchanger and the second high-pressure hydrogen storage alloy heat exchanger, the first low-pressure hydrogen storage alloy heat exchanger and the second Heating means for heating the first chamber of the intermediate-pressure hydrogen storage alloy heat exchanger, and high-temperature heat sources from the first low-pressure hydrogen storage alloy heat exchanger and the first high-pressure hydrogen storage alloy heat exchanger And when the low-temperature heat source is taken out, the second chamber and the second high-pressure hydrogen storage alloy heat exchanger of the first intermediate-pressure hydrogen storage alloy heat exchanger are cooled, and the second low-pressure hydrogen storage alloy heat exchanger is cooled. The second chamber and the first high pressure of the second intermediate-pressure hydrogen storage alloy heat exchanger when removing the high-temperature heat source and the low-temperature heat source from the alloy heat exchanger and the second high-pressure hydrogen storage alloy heat exchanger; Hydrogen storage alloy heat exchanger And it has a cooling means for performing retirement.

[0014]

FIG. 2 shows a hydrogen storage alloy heat pump according to the present invention.
As shown in FIG. 4, four types of hydrogen storage alloys M1, M2, M3, and M4 having different hydrogen equilibrium pressures are used.

In FIG. 2, the horizontal axis represents the reciprocal of the temperature, and the vertical axis represents the hydrogen equilibrium pressure in natural logarithm.
In this heat pump, the high-temperature heat source is taken out in the high-temperature field by the occlusion heat generation of (2), and the low-temperature heat source is taken out in the low-temperature field by the decomposition heat absorption of (7).

The decomposition endotherms of (1) and (3) are as follows:
(6) and (8)
Is generated by cooling by the cooling means. Further, the decomposition heat absorption of (5) is performed based on the calorific value of the occlusion heat generated in (4).

That is, according to the present invention, a high-temperature heat source is extracted in a high-temperature field by the heat generated by the occlusion of the hydrogen-absorbing alloy in the low-pressure hydrogen-absorbing alloy heat exchanger containing the hydrogen-absorbing alloy having the lowest hydrogen equilibrium pressure at the same temperature. On the other hand, a low-temperature heat source is extracted in a low-temperature field due to decomposition and heat absorption of the hydrogen storage alloy in the high-pressure hydrogen storage alloy heat exchanger containing the hydrogen storage alloy having the highest hydrogen equilibrium pressure at the same temperature.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a hydrogen storage alloy heat pump according to the present invention. In the drawing, reference numerals R1 and R2 denote four types of hydrogen storage alloys M1, M2, M3 having different hydrogen equilibrium pressures shown in FIG. The first and second low-pressure hydrogen storage alloy heat exchangers in which the hydrogen storage alloy M1 having the smallest hydrogen equilibrium pressure at the same temperature among M4 are stored.

Symbols R3 and R4 indicate that the hydrogen storage alloys M2 and M3 having the second and third lowest hydrogen equilibrium pressures at the same temperature among the four types of hydrogen storage alloys are connected via the heat transfer member B to the first. 1 shows first and second intermediate-pressure hydrogen storage alloy heat exchangers housed in a chamber S1 and a second chamber S2.

Further, reference numerals R5 and R6 denote first and second high-pressure hydrogen storage alloy heat exchangers in which the hydrogen storage alloy M4 having the highest hydrogen equilibrium pressure at the same temperature is accommodated.

The first chamber S1 of the first intermediate-pressure hydrogen-absorbing alloy heat exchanger R3 and the first low-pressure hydrogen-absorbing alloy heat exchanger R1 are connected by a first hydrogen transfer line L1. I have.

First intermediate pressure hydrogen storage alloy heat exchanger R3
Of the second chamber S2 and the first high-pressure hydrogen storage alloy heat exchanger R5
And are connected by a second hydrogen transfer pipeline L2.
First chamber S1 of second intermediate pressure hydrogen storage alloy heat exchanger R4
The second low pressure hydrogen storage alloy heat exchanger R2 is connected to the second low pressure hydrogen storage alloy heat exchanger R2 by a third hydrogen transfer pipeline L3.

Second intermediate pressure hydrogen storage alloy heat exchanger R4
Second chamber S2 and second high pressure hydrogen storage alloy heat exchanger R6
And are connected by a fourth hydrogen transfer pipeline L4.
In the first hydrogen transfer line L1 and the third hydrogen transfer line L3, electromagnetic on-off valves V13 and V14 are arranged, respectively.

The first and second low-pressure hydrogen storage alloy heat exchangers R1 and R2 are provided with a high-temperature heat source extraction line L5 for extracting a high-temperature heat source by heat exchange with these heat exchangers.

Electromagnetic on-off valves V1 and V2 are arranged on the inlet side of the first and second low-pressure hydrogen-absorbing alloy heat exchangers R1 and R2 of the high-temperature heat source discharge pipe L5. Further, the first and second high pressure hydrogen storage alloy heat exchangers R5, R6
Is provided with a low-temperature heat source extraction pipe line L6 for extracting a low-temperature heat source by heat exchange with these heat exchangers.

Electromagnetic on-off valves V3 and V4 are arranged on the inlet side of the low-temperature heat source taking-out line L6 to the first and second high-pressure hydrogen storage alloy heat exchangers R5 and R6. First and second low pressure hydrogen storage alloy heat exchangers R1, R2 and first and second intermediate pressure hydrogen storage alloy heat exchangers R3, R3
A heating pipe line L7 for supplying warm water from the boiler 50 is disposed in the first chamber S1 of R4.

The first and second low-pressure hydrogen storage alloy heat exchangers R1, R2 and the first
And second intermediate pressure hydrogen storage alloy heat exchangers R3, R4
Electromagnetic on-off valves V5, V6, V7, V8 are arranged on the inlet or outlet side of the first chamber S1.

The cooling chamber 5 is provided in the second chamber S2 of the first and second intermediate-pressure hydrogen storage alloy heat exchangers R3, R4 and the first and second high-pressure hydrogen storage alloy heat exchangers R5, R6.
A cooling line L8 for supplying the cold water from 1 is provided.

The downstream end of the cooling line L8 is connected to the boiler 5
0, and the downstream end of the above-mentioned heating line L7 is connected to the cooling tower 51. In addition, a circulation pump 53 is disposed in the cooling line L8.

Then, the second chamber S2 of the first and second intermediate-pressure hydrogen storage alloy heat exchangers R3, R4 of the cooling pipe line L8 and the first and second high-pressure hydrogen storage alloy heat exchangers R5, R5 Electromagnetic on-off valves V9, V10, V11, V12 are arranged on the inlet or outlet side to R6, respectively.

In the figure, reference symbol C denotes solenoid on-off valves V1 to V1.
The figure shows a control device which is a switching means for opening and closing V14. The control device C is connected to electric wires (not shown) to the respective solenoid on-off valves V1 to V14.

The above-described hydrogen storage alloy heat pump is operated by alternately repeating the first state shown in FIG. 3 and the second state shown in FIG. 4 at a predetermined time interval. That is, in the first state shown in FIG. 3, the high-temperature heat source and the low-temperature heat source are taken out from the first low-pressure hydrogen storage alloy heat exchanger R1 and the first high-pressure hydrogen storage alloy heat exchanger R5.

In this state, the control device C opens and closes the electromagnetic on-off valves V1 to V14 as shown in FIG. In FIG. 3, the white electromagnetic on-off valve indicates an open state, and the black electromagnetic on-off valve indicates a closed state.

In the first state, the inside of the first chamber S1 of the first intermediate-pressure hydrogen storage alloy heat exchanger R3 is heated, hydrogen is decomposed from the hydrogen storage alloy M2, and the decomposed hydrogen is removed from the first hydrogen.
Flows into the first low-pressure hydrogen-absorbing alloy heat exchanger R1 from the hydrogen-transporting line L1, and the hydrogen is absorbed into the hydrogen-absorbing alloy M1 in the first low-pressure hydrogen-absorbing alloy heat exchanger R1 by the inflow of hydrogen. Then, occlusion heat is generated (corresponding to (1) and (2) in FIG. 2).

The solenoid valves V7 and V13 are closed when the flow of hydrogen into the heat exchanger R1 is completed. In the first state, the second low-pressure hydrogen storage alloy heat exchanger R
2 is heated, hydrogen is decomposed from the hydrogen storage alloy M1,
Simultaneously with the opening of the solenoid on-off valve V14, the decomposed hydrogen is returned from the third hydrogen transfer line L3 to the first chamber S1 of the second intermediate-pressure hydrogen storage alloy heat exchanger R4 ((3) in FIG. 2). , (4)).

Next, in the first state, the inside of the second chamber S2 of the first intermediate-pressure hydrogen storage alloy heat exchanger R3 is cooled, and at the same time, the first chamber S1 is also cooled. , The hydrogen from the first high-pressure hydrogen storage alloy heat exchanger R5 flows from the second hydrogen transfer pipe L2 to the first
Is introduced into the second chamber S2 of the intermediate pressure hydrogen storage alloy heat exchanger R3, whereby the first high pressure hydrogen storage alloy heat exchanger R
The hydrogen storage alloy M4 in 5 decomposes and the decomposition heat absorption is performed (corresponding to (6) and (7) in FIG. 2).

In the first state, hydrogen is supplied into the first chamber S1 of the second intermediate-pressure hydrogen storage alloy heat exchanger R4, and heat is absorbed by the hydrogen storage alloy M2. The amount of generated heat is transmitted through the heat transfer member B to the second
The heat is transferred to the chamber S2, and the amount of this heat causes the decomposition and heat absorption of the hydrogen storage alloy M3 in the second chamber S2 ((4) in FIG. 2,
(Corresponding to (5)).

On the other hand, the heat generation and storage reaction of the hydrogen storage alloy M1 in the first low pressure hydrogen storage alloy heat exchanger R1 and the decomposition and heat absorption reaction of the hydrogen storage alloy M4 in the first high pressure hydrogen storage alloy heat exchanger R5 are completed. Then, the controller C opens and closes the electromagnetic on-off valves V1 to V12, and switches to the second state shown in FIG.

In FIG. 4, the white solenoid on-off valve indicates an open state, and the black solenoid on-off valve indicates a closed state. In the second state shown in FIG. 4, high-temperature heat sources and low-temperature heat sources are extracted from the second low-pressure hydrogen storage alloy heat exchanger R2 and the second high-pressure hydrogen storage alloy heat exchanger R6.

In this second state, the inside of the first chamber S1 of the second intermediate pressure hydrogen storage alloy heat exchanger R4 is heated, hydrogen is decomposed from the hydrogen storage alloy M2, and
Flows into the second low-pressure hydrogen-absorbing alloy heat exchanger R2 from the hydrogen-transporting pipe line L3, and the hydrogen is absorbed into the hydrogen-absorbing alloy M1 in the second low-pressure hydrogen-absorbing alloy heat exchanger R2 by the inflow of hydrogen Then, occlusion heat is generated (corresponding to (1) and (2) in FIG. 2).

Then, the solenoid valves V8 and V14 are closed when the flow of hydrogen into the heat exchanger R2 is completed. In the second state, the first low-pressure hydrogen storage alloy heat exchanger R
1 is heated, hydrogen is decomposed from the hydrogen storage alloy M1,
Simultaneously with the opening of the solenoid on-off valve V14, the hydrogen decomposed is returned from the first hydrogen transfer line L1 to the first chamber S1 of the first intermediate-pressure hydrogen storage alloy heat exchanger R3 ((3) in FIG. 2). , (4)).

Next, in the second state, the inside of the second chamber S2 of the second intermediate-pressure hydrogen storage alloy heat exchanger R4 is cooled, and at the same time, the first chamber S1 is also cooled. , The hydrogen from the second high-pressure hydrogen storage alloy heat exchanger R6 is transferred from the fourth hydrogen transfer line L4 to the second
To the second chamber S2 of the intermediate pressure hydrogen storage alloy heat exchanger R4, whereby the second high pressure hydrogen storage alloy heat exchanger R
Hydrogen storage alloy M4 in 6 is decomposed, and decomposition heat absorption is performed (corresponding to (6) and (7) in FIG. 2).

In the second state, hydrogen is supplied into the first chamber S1 of the first intermediate-pressure hydrogen storage alloy heat exchanger R3, and heat is absorbed and stored by the hydrogen storage alloy M2. The amount of generated heat is transmitted through the heat transfer member B to the second
The heat is transferred to the chamber S2, and the amount of this heat causes the decomposition and heat absorption of the hydrogen storage alloy M3 in the second chamber S2 ((4) in FIG. 2,
(Corresponding to (5)).

However, in the above-described hydrogen storage alloy heat pump, the hydrogen equilibrium pressure as shown in FIG.
Of the hydrogen storage alloys M1 in the low pressure hydrogen storage alloy heat exchangers R1 and R2 containing the hydrogen storage alloys M1 having the lowest hydrogen equilibrium pressure at the same temperature using the hydrogen storage alloys M1, M2, M3, and M4 of different kinds. Due to the occlusion heat, the high-temperature heat source is taken out in a high-temperature field, while the hydrogen storage alloy M4 in the high-pressure hydrogen storage alloy heat exchangers R5 and R6 that accommodates the hydrogen storage alloy M4 having the highest hydrogen equilibrium pressure at the same temperature is decomposed. Since the low-temperature heat source is taken out in the low-temperature field by heat absorption, it is possible to simultaneously obtain the high-temperature heat source in the high-temperature field and the low-temperature heat source in the low-temperature field.

By applying this hydrogen storage alloy heat pump to, for example, an environmental test room shown in FIG. 8, it becomes possible to easily obtain a low temperature from a low-temperature heat source without using a compressor. Since it is possible to obtain a regenerative heat source from a high-temperature heat source without using an electric heater, it is possible to greatly improve the COP (coefficient of performance) as compared with the related art.

Further, since there is no need to use Freon gas, the possibility of causing environmental destruction can be eliminated. Further, in the hydrogen storage alloy heat pump described above, the first and second intermediate pressure hydrogen storage alloy heat exchangers R
3, R4, the first chamber S1 and the second chamber S
2 was formed, and the first chamber contained the hydrogen storage alloy M2 and the second chamber contained the hydrogen storage alloy M3, so that the first chamber S1 and the second chamber S
2, heat can be directly exchanged and the piping system of the hydrogen storage alloy heat pump can be simplified.

The downstream end of the cooling line L8 is connected to the boiler 5
0, and the downstream end of the heating pipe L7 is connected to the cooling tower 51, so that the amount of heat of the fluid flowing through the cooling pipe L8 and the heating pipe L7 can be used efficiently.

In the above-described embodiment, an example in which a compressor is not used has been described. However, the present invention is not limited to this embodiment. For example, as shown by a dotted line in FIG. By lowering the pressure in the high-pressure hydrogen storage alloy heat exchangers R5 and R6, a lower-temperature low-temperature heat source can be obtained.

Further, in the above-described embodiment, an example was described in which a boiler was used for heating and a cooling tower was used for cooling. However, the present invention is not limited to this embodiment. Waste heat or recovered heat such as cogeneration may be used, and river water may be used for cooling.

[0050]

As described above, in the hydrogen storage alloy heat pump of the present invention, four types of hydrogen storage alloys having different hydrogen equilibrium pressures are used, and the hydrogen storage alloy having the lowest hydrogen equilibrium pressure at the same temperature is accommodated. The high-temperature heat source is taken out by the heat generated by the hydrogen storage alloy in the low-pressure hydrogen storage alloy heat exchanger, while the high-pressure hydrogen storage alloy heat exchanger in which the hydrogen storage alloy with the largest hydrogen equilibrium pressure is housed at the same temperature is stored. Since the low-temperature heat source is taken out by decomposition and absorption of the hydrogen storage alloy, there is an advantage that a high-temperature heat source can be obtained simultaneously in a high-temperature field and a low-temperature heat source can be obtained in a low-temperature field.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing one embodiment of a hydrogen storage alloy heat pump of the present invention.

FIG. 2 is an explanatory view showing the principle of the hydrogen storage alloy heat pump of the present invention.

FIG. 3 shows a first example of the hydrogen storage alloy heat pump shown in FIG.
It is a piping system diagram which shows the operation state of.

FIG. 4 shows a second example of the hydrogen storage alloy heat pump of FIG.
It is a piping system diagram which shows the operation state of.

FIG. 5 is an explanatory diagram showing an example in which a compressor is introduced into the hydrogen storage alloy heat pump of the present invention.

FIG. 6 is an explanatory diagram showing the principle of a conventional temperature-raising heat pump.

FIG. 7 is an explanatory view showing the principle of a conventional heat-increasing refrigeration heat pump.

FIG. 8 is a piping diagram showing a conventional air conditioner for an environmental test room.

[Explanation of symbols]

 R1 First low pressure hydrogen storage alloy heat exchanger R2 Second low pressure hydrogen storage alloy heat exchanger R3 First intermediate pressure hydrogen storage alloy heat exchanger R4 Second intermediate pressure hydrogen storage alloy heat exchanger R5 No. 1 high pressure hydrogen storage alloy heat exchanger R6 Second high pressure hydrogen storage alloy heat exchanger L1 First hydrogen transport pipeline L2 Second hydrogen transport pipeline L3 Third hydrogen transport pipeline L4 Fourth Hydrogen transfer line L5 High-temperature heat source extraction line L6 Low-temperature heat source extraction line L7 Heating line L8 Cooling line V1 to V12 Solenoid on-off valve C Controller M1, M2, M3, M4 Hydrogen storage alloy

Claims (1)

(57) [Claims] 1. A first and a second low-pressure hydrogen storage alloy heat exchanger accommodating a hydrogen storage alloy having the lowest hydrogen equilibrium pressure at the same temperature among four types of hydrogen storage alloys having different hydrogen equilibrium pressures, First and second hydrogen storage alloys having the second and third lowest hydrogen equilibrium pressures at the same temperature among the four types of hydrogen storage alloys are housed in the first chamber and the second chamber via the heat transfer member. An intermediate-pressure hydrogen storage alloy heat exchanger; first and second high-pressure hydrogen storage alloy heat exchangers accommodating a hydrogen storage alloy having the largest hydrogen equilibrium pressure at the same temperature among the four types of hydrogen storage alloys; A first hydrogen transfer line connecting the first chamber of the first intermediate-pressure hydrogen storage alloy heat exchanger and the first low-pressure hydrogen storage alloy heat exchanger; and the first intermediate pressure The second chamber of the hydrogen storage alloy heat exchanger and the second chamber A second hydrogen transfer line connecting the first high-pressure hydrogen storage alloy heat exchanger, the first chamber of the second intermediate-pressure hydrogen storage alloy heat exchanger, and the second low-pressure hydrogen storage alloy. A third hydrogen transfer pipe connecting the heat exchanger, connecting the second chamber of the second intermediate pressure hydrogen storage alloy heat exchanger and the second high pressure hydrogen storage alloy heat exchanger. A fourth hydrogen transfer line, a high-temperature heat source extraction line for extracting a high-temperature heat source by heat exchange with the first and second low-pressure hydrogen storage alloy heat exchangers, and the first and second high-pressure hydrogen A low-temperature heat source extraction pipe for extracting a low-temperature heat source by heat exchange with the storage alloy heat exchanger; a high-temperature heat source from the first low-pressure hydrogen storage alloy heat exchanger and the first high-pressure hydrogen storage alloy heat exchanger; When removing the low-temperature heat source, the second low-pressure hydrogen storage alloy heat exchanger Spare the first intermediate pressure hydrogen absorbing alloy heat exchanger first
The chamber is heated, and when the high-temperature heat source and the low-temperature heat source are taken out of the second low-pressure hydrogen storage alloy heat exchanger and the second high-pressure hydrogen storage alloy heat exchanger,
Heating means for heating the first chamber of the low pressure hydrogen storage alloy heat exchanger and the second intermediate pressure hydrogen storage alloy heat exchanger; and the first low pressure hydrogen storage alloy heat exchanger and the first Cooling of the second chamber and the second high-pressure hydrogen storage alloy heat exchanger of the first intermediate-pressure hydrogen storage alloy heat exchanger when removing the high-temperature heat source and the low-temperature heat source from the high-pressure hydrogen storage alloy heat exchanger And removing the high-temperature heat source and the low-temperature heat source from the second low-pressure hydrogen storage alloy heat exchanger and the second high-pressure hydrogen storage alloy heat exchanger. A cooling means for cooling the second chamber and the first high-pressure hydrogen storage alloy heat exchanger of the vessel.