JPH10132417A - Cooling system using hydrogen occlusion alloy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve an elimination of a pump and an efficient recovery of heat by arranging a steam transfer path to send steam obtained by a steam generator to a high temperature side reaction container, a heat exchange section to apply heat of the steam to a hydrogen occlusion alloy within the reaction container and a circulation path to circulate a heat medium liquefied by the heat exchange section to the steam generator. SOLUTION: After the end of the release of hydrogen in a hydrogen occlusion alloy M2, a low temperature side circulation path 12 is made to communicate with a low temperature side circulation path 12b by adjusting three-way valves 13a and 13b and a cooling heat medium is circulated between the heat exchange section 11 and a cooler 16 to cool the hydrogen occlusion alloy M2 beforehand. On the other hand, a high temperature side circulation path 5 is made to communicate with a high temperature side circulation path 5b by adjusting three-way valves 6a and 6b on the high temperature side to circulate steam from a steam boiler 9. The steam quickly reaches the heat exchange section 4 through the high temperature side circulation paths 5 and 5b without using a pump by its own high pressure and is liquefied after heating a hydrogen occlusion alloy M1 at the heat exchange section 4. The water thus obtained is smoothly circulated to a boiler 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system using a hydrogen storage alloy, which is used as a cooling device or a refrigeration device by utilizing an endothermic reaction of the hydrogen storage alloy.

[0002]

2. Description of the Related Art Conventionally, in the field of a cooling system such as a cooling device, a system utilizing an endothermic effect at the time of releasing hydrogen in a hydrogen storage alloy has been put to practical use. In this apparatus, as shown in FIG. 8, two kinds of hydrogen storage alloys M1 and M2 having different properties (for example, different hydrogen equilibrium pressures) are prepared.
Each is accommodated in a high-temperature side reaction vessel 50 and a low-temperature side reaction vessel 51, and both vessels 50, 51 are connected by a hydrogen transfer pipe 52 with a valve 52a interposed. In the high-temperature side reaction vessel 50, a hot water boiler (heating source) 53 for circulating hot water by a pump 53a and a cooling device 54 for circulating cooling water by a pump 54a are connected to the high-temperature side via three-way valves 53b and 54b, respectively. They are connected by a circulation path 55. On the other hand, a freezer 57 for circulating a heat medium by a pump 57a and a cooling device 58 for circulating cooling water by a pump 58a are connected to the low-temperature side reaction vessel 51 by a low-temperature side circulation path 59 via three-way valves 57b and 58b. Have been. The cooling device 5
8 is a water-cooled radiator 61 via a pump 60
It is connected to the.

In the above apparatus, when hydrogen is released from the low-temperature side hydrogen storage alloy M2 and hydrogen is stored in the high-temperature side hydrogen storage alloy M1, the high-temperature side hydrogen storage alloy M1 is cooled by the cooling device 54.
On the other hand, the inside of the freezer 57 is cooled by sending the heat medium cooled by the heat absorption generated in the low-temperature side hydrogen storage alloy M2 into the freezer 57. In addition, in this system configuration, it is necessary to perform a regeneration step of releasing hydrogen from the high-temperature side hydrogen storage alloy M1 and storing hydrogen in the low-temperature side hydrogen storage alloy M2, which is opposite to the time of cooling. It will be performed in a typical manner. During regeneration, the pump 53
a, the hot water is sent from the hot water boiler 53 to the high temperature side reaction vessel 50 to heat the high temperature side hydrogen storage alloy M1, and the hydrogen released by this is moved to the low temperature side reaction vessel 51 through the hydrogen transfer pipe 52, and The hydrogen is stored in the hydrogen storage alloy M2. In order to continuously perform the above-mentioned cooling, two sets of the above-described devices are prepared, these are connected in parallel, and the storage and release of hydrogen may be shifted by half a cycle in each set.

[0004]

However, in the conventional cooling system, since the hot water and the cooling water are transported using the pump in each part, the energy required for the operation of the pump is large.
There is a problem that the efficiency is low, and further, there is a problem that the system becomes complicated, and the volume and cost increase. Further, in the conventional cooling system, a method of circulating hot water is used as a method of heating the high-temperature side hydrogen storage alloy. However, since the amount of heat input to the hydrogen storage alloy is determined by the temperature difference between the input and output of the hot water, the hydrogen storage In order to heat the alloy efficiently, it is necessary to increase the temperature difference (minimum 10 ° C.). However, as a result, the heating temperature of the hydrogen storage alloy cannot be set high,
Sufficient reaction rate cannot be obtained. Further, there is a problem that a sufficient amount of absorbed and released hydrogen (effective hydrogen transfer amount) cannot be obtained. As a result, there arises a problem that the amount of the hydrogen storage alloy required for the system increases and the volume and cost of the system increase.

Further, in the case where a plurality of sets of devices are connected in parallel as described above in order to continuously obtain cold heat, the high-temperature side hydrogen storage alloy of the set subjected to the regenerating treatment has a high temperature of the set generating the cold heat. The temperature is higher than that of the side hydrogen storage alloy. Since this heat is wasted in a normal operation, conventionally, a method of connecting the high-temperature side circulation path of the two directly and moving a heat medium by a pump to move the heat to effectively recover the heat has been attempted. However, this method has a problem that since the heat medium passes through the high-temperature side circulation path, a large amount of heat is lost due to contact with the heat medium for cooling or the like, and efficient sensible heat recovery cannot be performed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cooling system that enables efficient operation by eliminating the need for a pump and efficiently recovering heat.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, a first invention of a cooling system using a hydrogen storage alloy according to the present invention comprises a high-temperature side reaction vessel each containing a different type of hydrogen storage alloy. A hydrogen transfer path is provided between the low-temperature side reaction vessel and a heat supply means and a cooling means are selectively connected to the high-temperature side reaction vessel, and a cold heat utilization unit and a cooling means are selected for the low-temperature side reaction vessel. In the cooling system connected as possible, the heat supply means includes a steam generator for evaporating a heat medium, a steam transfer path for sending steam obtained by the steam generator to the high-temperature side reaction vessel, and heat of the steam. It is characterized by comprising a heat exchanging section for giving to the hydrogen storage alloy in the high-temperature side reaction vessel, and an annular flow path for circulating the heat medium liquefied in the heat exchanging section to the steam generator.

A cooling system using a hydrogen storage alloy according to a second aspect of the present invention is the cooling system according to the first aspect, wherein the return flow path is a capillary tube arranged so that the heat exchange section is at a high position and the steam generator side is at a low position. It is characterized by comprising.

In a cooling system using a hydrogen storage alloy according to a third aspect of the present invention, a hydrogen transfer path is provided between a high-temperature side reaction vessel and a low-temperature side reaction vessel, each containing a different type of hydrogen storage alloy. A heat supply means and a cooling means are selectively connected to the reaction vessel via a high temperature side circulation path, and a cold heat utilization section and a cooling means are selectively connected to the low temperature side reaction vessel via a low temperature side circulation path. Cooling system,
A bypass pipe is connected between the heat supply means side and the cooling means side of the high temperature side circulation path.

In a cooling system using a hydrogen storage alloy according to a fourth aspect of the present invention, a hydrogen transfer path is provided between a high-temperature side reaction vessel and a low-temperature side reaction vessel, each containing a different type of hydrogen storage alloy, and A system in which a heat supply means and a cooling means are selectively connected to a reaction vessel via a high-temperature side circulation path, and a cold heat utilization section and a cooling means are selectively connected to the low-temperature side reaction vessel via a low-temperature side circulation path. In a cooling system that continuously supplies cold heat by changing the heating and cooling timings of the hydrogen storage alloy in each set, wherein the cooling means on the low temperature side uses a heat medium by the heat of the low temperature side hydrogen storage alloy. It is characterized by comprising an evaporator for evaporating water, a condenser for condensing this vapor to take heat, and a circulation path for circulating the evaporated or liquefied heat medium between the evaporator and the circulator. To.

In a cooling system using a hydrogen storage alloy according to a fifth aspect of the present invention, a hydrogen transfer path is provided between a high-temperature side reaction vessel and a low-temperature side reaction vessel each containing a different type of hydrogen storage alloy, and A system in which a heat supply means and a cooling means are selectively connected to a reaction vessel via a high-temperature side circulation path, and a cold heat utilization section and a cooling means are selectively connected to the low-temperature side reaction vessel via a low-temperature side circulation path. In a cooling system that continuously supplies cold heat by changing the heating and cooling timings of the hydrogen storage alloy in each set, two or more sets of The heat exchange part of the side reaction vessel is connected by a sensible heat recovery circuit which can be opened and closed freely.

A cooling system using a hydrogen storage alloy according to a sixth aspect of the present invention is the cooling system according to the fifth aspect, wherein a first bypass pipe is provided between the heat supply means side of the high-temperature side circulation path and the sensible heat recovery circulation path. And a second bypass pipe connected between the sensible heat recovery circuit and the cooling means side of the high temperature side circuit.

The present invention relates to a cooling system, and can be used as a cooling device, a refrigeration device, a cooling device, and the like. Further, the type of the hydrogen storage alloy used in the above device is not particularly limited and is appropriately selected, but the heat generation amount and the effective hydrogen amount per alloy are large, and the hysteresis and the plateau gradient are small. Those having excellent durability are desirable. In addition, it is desirable to select a hydrogen storage alloy between the high temperature side and the low temperature side in consideration of the heat source temperature and the utilization part temperature.

Although the material and structure of each reaction vessel are not particularly limited, heat can be efficiently transferred, and the hydrogen storage alloy can be brought into good contact with hydrogen, and hydrogen can be smoothly removed. It is desirable to be able to move. In addition, the hydrogen transfer path arranged between the reaction vessels is usually constituted by a pipe connecting the reaction vessels. In addition, except for the heat supply unit, the structure of the cooling unit and the cooling heat utilization unit, the structure of the circulation path, the arrangement, and the like are not particularly limited, but in the cooling unit on the low temperature side,
An evaporator for evaporating the heat medium by the heat of the low-temperature-side hydrogen storage alloy, a condenser for condensing this vapor to remove heat, and a circulation path for circulating the evaporated or liquefied heat medium between the evaporator and the circulator. By using a heat pipe type comprising: a cooling means that does not use a pump can be constructed. The cooling means on the high-temperature side can also be of the same heat pipe type as described above. This eliminates the need for energy to operate the pump and moves the heat medium by the action of the steam, thereby improving the efficiency of the system.

Preferably, the heat supply means on the high-temperature side comprises a steam generator, a steam transfer path, a heat exchange section, and an annular flow path. In addition, a liquid storage section is provided at the base end or in the middle of the annular flow path. You may have. The heat medium used for the heat supply means is typically water, but is not limited thereto, and another medium may be used depending on the temperature of steam or the like. As the steam generator, a steam boiler can be exemplified, and from this boiler to the high-temperature side reaction vessel,
Steam is fed through a steam transfer path such as a steam pipe. The structure of the heat exchange portion that transmits heat to the hydrogen storage alloy is not particularly limited, but it is desirable that the heat exchange portion can efficiently transmit heat and that the liquefied heat medium can move smoothly.
One in which the vapor inlet side is at a high position and the liquid outlet side is at a low position. Further, it is desirable that the recirculation portion is such that the heat medium liquid smoothly flows to the steam generator, and the heat exchange portion side is at a high position,
It is desirable that the recirculation portion itself be formed of a capillary tube with the steam generator side at a low position. As a result, the heat medium liquefied using gravity and capillary action can be smoothly circulated.

Further, in the cooling system using a hydrogen storage alloy, since the heat supply means and the cooling means are selectively connected on the high temperature side as described above, a large pressure fluctuation occurs at the time of selection due to a temperature difference in the circulation path. There is a problem that an excessive load is applied to a pump or the like. For this reason, conventionally, a pressure regulation tank is provided in a part of the circulation path to alleviate the pressure fluctuation, but there is a problem that the equipment becomes excessively large and disadvantageous in terms of space and cost. Therefore, by connecting the heat supply means side and the cooling means side of the high-temperature side circulation path with a bypass pipe, pressure fluctuation can be avoided without the need for the pressure adjustment tank. The bypass piping is
It is desirable that the inner diameter be 1/5 or less of the circulation pipe. This prevents the occurrence of excessive mixing.

In a system in which two or more sets of devices are connected in parallel to continuously extract cold heat, in order to effectively recover heat from the high-temperature-side hydrogen storage alloy after the regeneration treatment, the above-mentioned high-temperature It is desirable to make the circulation path openable and closable, and to connect the sets of high-temperature side reaction vessel heat exchange sections with a sensible heat recovery circulation path that can be opened and closed. The connection position of the circulation path may be at or near the heat medium entrance / exit of the heat exchange unit. With the arrangement of the sensible heat recovery circuit, sensible heat can be efficiently recovered, and the efficiency of the entire system is improved. In the case where steam is used as the heat supply means as shown in the first invention, one end of the sensible heat recovery circulation path is connected to a portion of the circulation path where the heat medium liquid is circulated, that is, the annular flow path. It is desirable to connect to the corresponding part. In a system in which a sensible heat recovery circuit is provided and a bypass pipe is arranged to avoid pressure fluctuation, a first bypass pipe is provided between the heat supply means side of the high-temperature side circuit and the sensible heat recovery circuit. And a second bypass pipe is desirably connected between the sensible heat recovery circulation path and the cooling means side of the high-temperature side circulation path.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Next, an embodiment of the present invention will be described with reference to the accompanying drawings (FIG. 1). Two kinds of hydrogen storage alloys M1 and M2 having different hydrogen equilibrium pressures (for example, TiZrCrFeMn
A Cu-based alloy and a TiZrCrFeMnNiCu-based alloy) are accommodated in a high-temperature side reaction vessel 1 and a low-temperature side reaction vessel 2, respectively, and both vessels 1 and 2 are connected by a hydrogen transfer pipe 3 with a valve 3a interposed. In the high temperature side reaction vessel 1, a fin tube type heat exchange section 4 is arranged so that the entrance side is at a high position and the exit side is at a low position. Are in direct contact. Further, the heat exchange section 4
One end of a high-temperature side circulation path 5 is connected to the entrance and exit sides of the three-way valve 6, respectively.
The three-way valve 6b is connected to the outlet high-temperature side circulation path 5 with a liquid storage tank 8 interposed therebetween. The three-way valves 6a and 6b are connected to the high-temperature side circulation paths 5a and 5b, and the high-temperature side circulation path 5a is connected to the cooling device 7 via a pump 7a. Is connected to the boiler 9. The high-temperature side circulation path 5b and the high-temperature side circulation path 5 extending from the boiler 9 to the entrance side of the heat exchange section 4 constitute a steam transfer path, and the high-temperature side circulation path from the exit side of the heat exchange section 4 to the boiler 9 is formed. The circulation path 5 and the high-temperature side circulation path 5b constitute an annular flow path.

On the other hand, a fin tube type heat exchange section 11 is disposed in the low temperature side reaction vessel 2 as described above, and the heat exchange section 11 is in direct contact with the hydrogen storage alloy M2. One end of a low temperature side circulation path 12 is connected to each of the entrance and exit sides of the heat exchange section 11, and the other end of the low temperature side circulation path 12 is connected to three-way valves 13a and 13b.
The three-way valves 13a and 13b further have a low-temperature side
a, 12b are connected, and the low temperature side circulation path 12a is
The cooling device 16 is connected to the freezer 15 which is a cold heat utilization unit via a pump 15a, and the cooling device 16 is connected to the low temperature side circulation path 12b via a pump 16a.

The operation of the above device will be described. At this time, it is assumed that only the hydrogen storage alloy M2 stores hydrogen. The temperature of the hydrogen storage alloy M1 is increased by heating when hydrogen is released, and the hydrogen storage alloy M1 is cooled by the cooling device 7. Specifically, by adjusting the three-way valves 6a and 6b, the high-temperature side circulation path 5 and the high-temperature side circulation path 5a communicate with each other, and the cooling device 7
Cooling water from the high temperature side circulation path 5, 5a by the pump 7a
To the heat exchanging section 4. The hydrogen storage alloy M1 is cooled by the cooling water, an equilibrium decomposition pressure difference is generated between the hydrogen storage alloy M2 and the hydrogen storage alloy M2, hydrogen is released from the hydrogen storage alloy M2, and hydrogen is transferred into the high temperature side reaction vessel 1 through the hydrogen transfer pipe 3. Sent in. This hydrogen is stored in the hydrogen storage alloy M1.
Begins to be occluded. In the hydrogen storage alloy M2, an endothermic phenomenon occurs with the release of hydrogen. On the low temperature side, the three-way valves 13a and 13b adjust the low temperature side circulation path 12 and the low temperature side circulation path 12a to communicate with each other, and the heat medium circulates from the freezer 15 to the heat exchange part 11; This heat medium is cooled by the endothermic phenomenon of M2. The cooled heat medium deprives the freezer 15 of heat and cools the freezer 15.

After the release of hydrogen from the hydrogen storage alloy M2 is completed, the three-way valves 13a and 13b are adjusted so that the low-temperature side circulation path 12 and the low-temperature side circulation path 12b communicate with each other.
A cooling heat medium is circulated between the cooling device 1 and the cooling device 16 to cool the hydrogen storage alloy M2. On the other hand, on the high temperature side, the high temperature side circulation path 5 and the high temperature side circulation path 5b are communicated with each other by adjusting the three-way valves 6a and 6b, and the steam from the steam boiler 9 is circulated. This steam quickly reaches the heat exchange section 4 through the high-temperature circulation paths 5, 5b without using a pump due to its own high pressure, and heats the hydrogen storage alloy M1 in the heat exchange section 4 and then liquefies. . The water descends in the high-temperature side circulation path 5, that is, the annular flow path by gravity and capillary action, and is temporarily stored in the liquid storage tank 8.
b (a part of the annular flow path) and smoothly return to the steam boiler 9. Thus, the heated hydrogen storage alloy M1 starts releasing hydrogen, and this hydrogen is stored in the hydrogen storage alloy M2 through the hydrogen transfer pipe 3. Cold heat can be supplied to the freezer by repeating the above cycle.

Since the hydrogen storage alloy M1 is heated by utilizing latent heat by steam, a sufficient amount of heat can be given to the hydrogen storage alloy by reducing the temperature difference between the entrance and exit of the heat medium. Can be set high. In order to test this, the heat exchange part was placed in a water tank, and the entrance and exit temperatures of the heat exchange part were measured. The results are as shown below, and it is clear that efficient heat exchange is performed even when the temperature difference between the entrance and the exit is reduced.

[0023]

[Table 1]

In the above apparatus, the supply of cold heat and the regeneration processing are alternately performed, so that it is not possible to continuously supply cold heat. However, a plurality of the above apparatuses are prepared and connected in parallel with each other to store each hydrogen. Cold heat can be continuously supplied by shifting the cycle of the hydrogen storage and release cycles in the alloy.

(Embodiment 2) In this embodiment, as shown in FIG. 2, a bypass pipe 17 is connected to the high-temperature side circuit in order to prevent pressure fluctuation caused by a temperature difference in the high-temperature side circuit. Yes, and will be specifically described below. In addition,
In the following embodiments, the same structures as those in the other embodiments are denoted by the same reference numerals, and description thereof will be omitted or simplified. The cooling device 7 includes a pump 7a and valves 6a and 6b.
Are connected to the high-temperature side reaction vessel 1 by the high-temperature side circulation path 5a and the high-temperature side circulation path 5, and the heat supply means (steam boiler 9) is similarly connected to the high-temperature side via valves 6a and 6b. The circulation path 5 b and the high-temperature side circulation path 5 are connected to the high-temperature side reaction vessel 1. In addition, the high temperature side circulation path 5
a and a part of the high-temperature side circulation path 5b are connected by a bypass pipe 17.
Is composed of a thin tube whose diameter is sufficiently smaller than the high temperature side circulation paths 5a and 5b (a diameter of 1/5 or less). In this device, the high-temperature side circulation path 5a and the high-temperature side circulation path 5b are always in communication, and the pressure difference between them is reduced. For this reason,
When the used circulation path is changed by switching the valves 6a and 6b, the pressure hardly fluctuates, thereby preventing an excessive load on the pump 7a. In the above embodiment, the heat supply means including the steam boiler is used, and when the bypass pipe is installed, communication between the liquid and the liquid is desirable. Therefore, the circulation path portion where the liquid moves, that is, the high-temperature side circulation It is connected to the lower side of the road 5b in the figure. Note that, in the present invention relating to this embodiment, since the configuration of the heat supply means is not particularly limited, for example, a bypass pipe is similarly installed in a cooling system using a hot water boiler as a heat supply means as in a conventional example. be able to. However, since the pressure fluctuation becomes more remarkable in the heating using steam, the bypass pipe has a more remarkable effect in the system using the boiler.

(Embodiment 3) In this embodiment, as shown in FIG. 3, two sets of systems are connected in parallel, and a sensible heat recovery circuit 40 is connected between heat exchange units in the reaction vessel on the high temperature side. Yes, and will be specifically described below. High temperature side reaction vessel 21
a and 21b contain a hydrogen storage alloy M1 and low-temperature reaction vessels 22a and 22b contain a hydrogen storage alloy M2, and the high-temperature reaction vessels 21a and 21b and the low-temperature reaction vessel 2
2a and 22b are connected by hydrogen transfer pipes 24a and 24b via valves 23a and 23b. In the high temperature side reaction vessels 21a and 21b, heat exchange sections 25a,
25b, heat exchange units 26a and 26b are disposed in the low temperature side reaction vessels 22a and 22b.
The high-temperature side circulation paths 27a and 27b are connected to a and 25b. The high-temperature side circulation paths 27a and 27b are
8a, 28b, 28c, and 28d via the high-temperature side circuit 2
9a and 29b, the high temperature side circulation path 29a is connected to the cooling device 30 via a pump 30a, and the high temperature side circulation path 29b is connected to the heat supply means 31 via a pump 31a.
It is connected to the. On the other hand, the low temperature side reaction vessels 22a, 22
b, the low-temperature side circulation path 34 is connected to the heat exchange portions 26a and 26b.
a, 34b are connected, and the low temperature side circulation path 34a,
The low-temperature side circulation path 36a and the low-temperature side circulation path 36b are connected to 34b via three-way valves 35a, 35b, 35c, and 35d. Further, the pump 3 is connected to the low temperature side circulation path 36a.
The heat utilization unit 37 is connected to the cooling unit 38 via the pump 38a, and the heat utilization unit 37 is connected to the cooling unit 38 via the pump 38a. A sensible heat recovery circuit 40 is connected between the high-temperature side heat exchange section 25a and the heat exchange section 25b, and valves 40a, 40a are interposed midway.

In the above-described apparatus, when cold heat is generated by one of the high-temperature side hydrogen storage alloy and the low-temperature side hydrogen storage alloy, the other high-temperature side hydrogen storage alloy is The regeneration treatment is performed with the side hydrogen storage alloy. Here, assuming that the regeneration treatment is performed on the reaction vessel 21b side for convenience, in the high-temperature side hydrogen storage alloy M1 after the regeneration treatment, the liquefied warm water is discharged from the heat exchange unit 25b, and only the steam is filled. To shut off the high-temperature side circulation path 27b by adjusting the three-way valves 28a, 28b, 28c, 28d,
The valves 40a and 40a are opened to communicate with the other high-temperature-side hydrogen storage alloy heat exchange section 25a through the sensible heat recovery circuit 40. By this communication, the steam in the heat exchange section 25b immediately after the regeneration process passes through the outward path of the sensible heat recovery circulation path 40 and reaches the other heat exchange section 25a, where the high-temperature side hydrogen storage alloy on the side where the cold heat supply is terminated is removed. Heat to make effective use of sensible heat. The steam deprived of heat in the heat exchange section 25a is condensed and moves to the heat exchange section 25b, which is first filled with steam, through the return path of the sensible heat recovery circuit 40. Here, although hot water is gradually generated in both heat exchanging sections, since it does not completely fill both heat exchanging sections, there is a concern that heat exchange from the hydrogen storage alloy to the heat medium may not be efficiently performed. However, as shown in FIG. 4, in the high-temperature side reaction vessel 21b, when the temperature decreases on the liquid side L, the hydrogen partial pressure of the hydrogen storage alloy decreases, so that the hydrogen storage alloy on the vapor side S shifts from the hydrogen storage alloy on the liquid side L. Hydrogen moves to the alloy, and accordingly, the temperature also moves from the vapor side S to the liquid side L, and sensible heat recovery is performed well.
As a result, the recovery rate of sensible heat is improved to 30 to 40%.
Note that this sensible heat recovery is combined with the first invention (heating by utilizing steam) shown in the above embodiment,
Greater effects can be obtained. Water (steam) is generally used from the viewpoint of utilizing evaporation and condensation. However, when a high operating temperature (for example,> 200 ° C.) or a low operating temperature (for example, <60 ° C.) is required in the system, a heat medium having a higher evaporation temperature than water (for example, oil) is used as a heat medium. The same effect can be expected by using a material having a low vapor temperature (for example, an alcohol mixed solution).

(Embodiment 4) In this embodiment, in a cooling system provided with a sensible heat recovery circuit as in Embodiment 3, a bypass pipe is provided to prevent pressure fluctuation, and FIG. In order to prevent a decrease in the sensible heat recovery efficiency as shown in (1), the cooling side circulation path and the heating side circulation path are connected via a sensible heat recovery circulation path 40 by a bypass pipe. Specifically, the high temperature side circulation path 27a and the sensible heat recovery circulation path 40 are connected by a first bypass pipe 41, and the sensible heat recovery circulation path 40 and the high temperature side circulation path 27b are connected by a second bypass pipe. Connect at 42. Thereby, the first bypass pipe 41, the sensible heat recovery circuit 40, and the second bypass pipe 4
2, the pressure difference between the high-temperature side circulation path 27a and the high-temperature side circulation path 27b is reduced, pressure fluctuations are prevented, and fluctuations in the flow rate of the heat medium circulating in the sensible heat recovery circulation path 40 are suppressed. The sensible heat recovery is stably performed, and it is possible to prevent a decrease in the sensible heat recovery rate due to a phenomenon such as a change in the flow rate of the heat medium or no flow.

(Embodiment 5) In this embodiment, as shown in FIG. 6, a heat medium is moved by a heat pipe type in a cooling device connected to a low-temperature side reaction vessel. Specifically, an evaporator is used as the cooling device 38 connected to the low-temperature side reaction vessel 22a or 22b, and a condenser 46 and a tank 47 are provided in the middle of a circulation path 45 of the evaporator. As a heat medium circulated between the evaporator and the condenser 46, methanol is exemplified. When cooling the low-temperature side hydrogen storage alloy, the heat of the heat medium (for example, methanol) circulating in the low-temperature side circulation path 36b is received by the evaporator (cooling device 38), and the heat medium in the circulation path 45 is evaporated. The evaporated heat medium is condensed in the condenser 46 and deprived of heat, temporarily stored in the tank 47, and then returns to the evaporator. According to the above-described device, a pump is not required on the circulation path 45 side, thereby saving labor. Further, the system is simplified, and downsizing and cost reduction are achieved.

FIG. 7 shows that the heat medium is directly supplied to the heat exchange portions 26a, 26b of the low-temperature side reaction vessels 22a, 22b without using an evaporator.
6b. According to this device, no pump is required in the cooling device, and the above-mentioned effect is remarkable. Further, since the heat medium is directly evaporated in the heat exchange section of the reaction vessel, the heat exchange loss is small and efficient.

Although each of the above embodiments specifically shows each invention, it is needless to say that the present invention is not limited to these contents. In addition, each invention is
It is also possible to construct one cooling system by combining two or more, and the combination is arbitrary.

[0032]

As described above, in the cooling system according to the first aspect of the present invention, the heat supply means includes the steam generator for evaporating the heat medium and the steam obtained by the steam generator for the high-temperature side reaction vessel. Since it is composed of a steam transfer path for sending, a heat exchange section for giving the heat of the steam to the hydrogen storage alloy in the high-temperature side reaction vessel, and an annular flow path for circulating the heat medium liquefied in the heat exchange section to the steam generator, By circulating the heat medium smoothly without the need for a pump, the hydrogen storage alloy can be heated with high efficiency,
The efficiency of the entire system can be improved. This results in a low cost, compact, high efficiency cooling system.

In the cooling system according to the second aspect of the present invention, the annular flow path is constituted by a capillary tube arranged so that the heat exchange section is at a high position and the steam generator side is at a low position. And the heat medium can be moved more smoothly.

In the third cooling system, since the bypass pipe is connected between the heat supply means side and the cooling means side of the high temperature side circulation path, the third cooling system generates a heat between the heat supply side and the cooling side of the high temperature side circulation path. Pressure fluctuations can be prevented to prevent an excessive load from being applied to a pump or the like provided in the circulation path.

The fourth cooling system includes a low-temperature-side cooling means including an evaporator for evaporating a heat medium by the heat of the low-temperature-side hydrogen storage alloy, a condenser for condensing the vapor and removing heat,
Since the evaporating or liquefied heat medium is constituted by the circulation path for circulating the heat medium between the evaporator and the circulator, the heat medium in the low-temperature side cooling system can be moved efficiently without the need for a pump. This enables labor saving and compactness.

The fifth cooling system is a cooling system that continuously supplies cold heat by using two or more sets of systems. Since the container heat exchange section is connected by a sensible heat recovery circuit that can be freely opened and closed, sensible heat wasted by each set of high-temperature side hydrogen storage alloys can be effectively recovered and efficiency can be improved.

Further, in the sixth cooling system, in the fifth cooling system, a first bypass pipe is connected between the heat supply means side of the high-temperature side circulation path and the sensible heat recovery circulation path,
Since the second bypass pipe is connected between the sensible heat recovery circulation path and the cooling means side of the high-temperature side circulation path, even when sensible heat recovery is performed, the heating side of the circulation path can be maintained without impairing the recovery efficiency. Pressure fluctuations occurring between the cooling side and the cooling side can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing Embodiment 1 of the present invention.

FIG. 2 is a schematic diagram of a second embodiment.

FIG. 3 is a schematic diagram of a third embodiment.

FIG. 4 is a schematic diagram illustrating a state of a heat medium during sensible heat recovery according to a third embodiment.

FIG. 5 is a schematic diagram of Embodiment 4 of the present invention.

FIG. 6 is a schematic view of the fifth embodiment.

FIG. 7 is a schematic diagram showing a modification of the fifth embodiment.

FIG. 8 is a schematic diagram showing a conventional cooling system.

[Explanation of symbols]

1, 21a, 21b High-temperature side reaction vessel 2, 22a, 22b Low-temperature side reaction vessel 3, 24a, 24b Hydrogen transfer tube 4, 11, 25a, 25b, 16a, 16b Heat exchange section 5, 5a, 5b, 27a, 27b, 29a, 29b High-temperature side circulation path 7 Cooling device 8 Liquid storage tank 9 Steam boiler 12, 12a, 12b, 34a, 34b, 36a, 36
b Low-temperature side circulation path 15a, 16a, 30a, 31a, 37a, 38a Pump 15 Freezer 16 Cooling device 17 Bypass pipe 30 Cooling device 31 Heat supply means 37 Heat utilization unit 38 Cooling device 40 Sensible heat recovery circuit 41 First Bypass pipe 42 Second bypass pipe 45 Circulation path 46 Condenser 47 Tank

Claims (6)

[Claims] 1. A hydrogen transfer path is provided between a high-temperature side reaction vessel and a low-temperature side reaction vessel each containing a different type of hydrogen storage alloy, and heat supply means and cooling means can be selected for the high-temperature side reaction vessel. And a cooling system in which a cold heat utilization unit and a cooling means are selectively connected to the low-temperature side reaction vessel, wherein the heat supply means includes a steam generator for evaporating a heat medium, and the steam generator. A steam transfer path for sending the steam to the high-temperature side reaction vessel, a heat exchange section for giving the heat of the steam to the hydrogen storage alloy in the high-temperature side reaction vessel, and a heat medium liquefied in the heat exchange section to the steam generator. A cooling system using a hydrogen-absorbing alloy, characterized by comprising an annular flow path for reflux. 2. The hydrogen storage alloy according to claim 1, wherein the return channel is formed by a capillary tube arranged so that the heat exchange section is at a high position and the steam generator is at a low position. Cooling system 3. A hydrogen transfer path is provided between a high-temperature side reaction vessel and a low-temperature side reaction vessel each containing a different type of hydrogen storage alloy, and heat supply means is provided to the high-temperature side reaction vessel via a high-temperature side circulation path. And the cooling means can be connected selectively.
In a cooling system in which a cold utilization unit and a cooling means are selectively connected to the low-temperature side reaction vessel via a low-temperature side circulation path, a bypass is provided between the heat supply means side and the cooling means side of the high-temperature side circulation path. Cooling system using hydrogen storage alloy characterized by connecting pipes 4. A hydrogen transfer path is provided between a high-temperature side reaction vessel and a low-temperature side reaction vessel each containing a different type of hydrogen storage alloy, and heat supply means is provided to the high-temperature side reaction vessel via a high-temperature side circulation path. And a cooling means selectably connected to the low-temperature side reaction vessel via a low-temperature side circulation path, and a low-temperature side cooling means is selectably connected to the low-temperature side reaction vessel. An evaporator that evaporates the heat medium by the heat of the hydrogen storage alloy, a condenser that condenses the vapor to remove heat, and a circulation path that circulates the evaporate or liquefied heat medium between the evaporator and the circulator. A cooling system using a hydrogen storage alloy, characterized by comprising 5. A hydrogen transfer path is provided between a high-temperature side reaction vessel and a low-temperature side reaction vessel each containing a different type of hydrogen storage alloy, and heat supply means is provided to the high-temperature side reaction vessel via a high-temperature side circulation path. And a cooling means selectably connected to the low-temperature side reaction vessel via the low-temperature side circulation path.
In a cooling system that continuously supplies cold heat by changing the heating and cooling timings of the hydrogen storage alloy in each set, a high temperature side circulation path of each set can be freely opened and closed and a high temperature side reaction of each set is provided. A cooling system using a hydrogen storage alloy, characterized by connecting the container heat exchange section with a sensible heat recovery circuit that can be freely opened and closed. 6. A first bypass pipe is connected between the heat supply means side of the high temperature side circulation path and the sensible heat recovery circulation path, and a first bypass pipe is connected between the sensible heat recovery circulation path and the cooling means side of the high temperature side circulation path. 6. A cooling system using a hydrogen storage alloy according to claim 5, wherein a second bypass pipe is connected therebetween.