JP3425253B2 - Method and apparatus for recovering reaction heat of hydrogen storage alloy - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a reaction of a hydrogen storage alloy which can be used for heat pump, hydrogen storage device, hydrogen purification device, actuator, heat storage etc. The present invention relates to a heat recovery method and a reaction heat recovery device.

[0002]

2. Description of the Related Art In recent years, a method has been proposed in which hydrogen is stored in a metal or alloy of a certain kind and used in the form of a metal hydride for a heat pump, a hydrogen storage device, a hydrogen purification device, an actuator, heat storage and the like. . Among alloys that form metal hydrides, LaNi ₅ , CaNi ₅ , and M are alloys that can store and release hydrogen at −20 ° C. to 300 ° C.
Typical examples are g ₂ Ni and FeTi. These alloys are especially called hydrogen storage alloys. The hydrogen storage alloy is usually used in the form of powder because it is necessary to increase the surface area in order to rapidly store and release hydrogen.

An important point in a system using a hydrogen storage alloy is to increase the rate of storage and release of hydrogen. For this purpose, in the storage of hydrogen, the heat of reaction in the alloy packed bed is efficiently converted into hydrogen. When removing hydrogen from the storage alloy packed bed and releasing hydrogen, heat corresponding to reaction heat must be efficiently supplied from the outside into the alloy packed bed.

As shown in FIG. 3, the container for holding the hydrogen storage alloy is generally provided with an in-container heat transfer medium pipe 44 in a hydrogen storage alloy reaction container 41 to allow the heat transfer medium to flow therethrough to store the hydrogen storage alloy. Exothermic and endothermic reaction heat of the alloy 42 is removed, hydrogenation reaction,
The dehydrogenation reaction is promoted, and hydrogen is quickly absorbed and released through the filter 43. In addition, as shown in FIG. 4, the external heat medium pipe 5 outside the hydrogen storage alloy reaction container 51
A heat medium is caused to flow in 4 to remove the heat of reaction of the hydrogen storage alloy 52 from heat generation and heat absorption, promote hydrogenation reaction and dehydrogenation reaction, and perform rapid storage and release of hydrogen through the filter 53.

In the hydrogen storage alloy, the volume of the metal powder expands by about 15 to 30% when hydrogen is absorbed, so that the expansion and contraction of the alloy occur as the hydrogen is absorbed and released. Further, it has been pointed out that the fine powder of the alloy is apt to thicken in the lower part of the container in the case of fixed filling because the alloy is further pulverized, and a very large stress is applied to the container. From the above, for the container filled with the hydrogen storage alloy, the thermal conductivity of the hydrogen storage alloy is improved,
Various developments have been made so far for the purpose of preventing pulverization and relaxing the stress on the container when the alloy expands and contracts.

As a method for improving the heat conduction of the alloy packed bed, the closest technique to the present invention is to fluidize the hydrogen storage alloy to promote heat transfer with the heat transfer medium pipe in the container. Regarding the method of fluidizing the hydrogen storage alloy, a method of improving heat transfer by directly agitating the alloy powder from the outside by using a shaft penetrating the container and fluidizing it (Japanese Patent Laid-Open No. 60-60400). , MH packed bed with hydrogen to form a fluidized bed to accelerate heat transfer
2-241801, JP-A-63-129264, JP-A-63-131963, JP-A-63-
140200, JP-A-63-265801), a method of promoting heat transfer by combining a fluidized bed and a moving bed (JP-A-63-140261), and a method of promoting heat transfer by a moving bed (Japanese Patent Publication No. 3-53969, Japanese Patent Publication No. 4-44601). Further, there is a method by the present inventors (Japanese Patent Application Laid-Open No. 4-160001) in which the hydrogen storage alloy powder in the container is vibrated and fluidized by externally applying vibration to accelerate heat transfer.

[0007]

[Problems to be Solved by the Invention]
In the method of Japanese Patent Application Laid-Open No. 4-160001 in which heat exchange is remarkably promoted, by vibrating the hydrogen storage alloy holding container from the outside, the hydrogen storage alloy inside the hydrogen storage alloy reaction container flows and the hydrogen storage alloy reaction container By violently contacting the internal heat transfer medium pipe, the amount of heat held by the hydrogen storage alloy is rapidly transferred to the medium in the heat transfer medium pipe, and heat transfer is significantly promoted.
However, the hydrogen storage alloy has a characteristic that it is finely pulverized due to repeated expansion and contraction of the crystal lattice as it absorbs and releases hydrogen, and this effect gradually hinders the flow of the hydrogen storage alloy and reduces the heat transfer effect. was there.

On the other hand, without applying vibration, the hydrogen-absorbing alloy reaction vessel is brought down from the upper holding vessel in the upper part while being brought into contact with the heat transfer medium tube of the hydrogen-absorbing alloy reaction vessel to form the hydrogen-absorbing alloy. While exchanging heat with the heat transfer medium tube, it is possible to move the hydrogen storage alloy reaction vessel to a lower holding vessel below the hydrogen storage alloy reaction vessel to store and release hydrogen. However, the hydrogen storage alloy has a volume of 15 when storing hydrogen.
It has a characteristic that it expands by -30% and the volume shrinks by 15-30% when hydrogen is released. Since the space for separating the heat transfer tubes is provided to secure the fluidity, the utilization rate of the heat transfer area is increased. There is a problem that the heat output is low and the heat output is relatively small. Further, the angle of repose of the hydrogen storage alloy is 40 to 85 degrees, and there is a problem that the fluidity is as bad as dust.

It is an object of the present invention to provide a reaction heat recovery method and a reaction heat recovery apparatus which promote heat exchange between a hydrogen storage alloy and a heat transfer medium tube and have high heat recovery efficiency.

[0010]

The gist of the present invention is as follows. (1) In a reaction heat recovery method for a hydrogen storage alloy, in which heat generated by an exothermic reaction when hydrogen is stored in a hydrogen storage alloy is recovered by heat exchange with a heat transfer medium pipe, an upper holding installed on an upper portion of a hydrogen storage alloy holding container While oscillating the hydrogen storage alloy stored in the container, it is lowered into the hydrogen storage alloy holding container to store hydrogen in the hydrogen storage alloy holding container,
While vibrating, the heat medium pipe provided in the hydrogen storage alloy holding container is brought into contact with the hydrogen storage alloy that has generated heat during storage to exchange heat to recover reaction heat, and then the hydrogen storage alloy that has stored hydrogen is stored in the hydrogen storage alloy. A method for recovering heat of reaction of a hydrogen storage alloy, characterized by lowering and recovering in a lower holding container installed at a lower part of the alloy holding container. (2) In the reaction heat recovery method of a hydrogen storage alloy, in which the heat due to the endothermic reaction when releasing hydrogen from the hydrogen storage alloy is exchanged by a heat medium tube to be recovered, the upper holding installed on the upper part of the hydrogen storage alloy holding container While lowering the hydrogen storage alloy holding hydrogen stored in the container into the hydrogen storage alloy holding container while vibrating, hydrogen is released in the hydrogen storage alloy holding container, and at the same time, the hydrogen storage alloy cooled at the time of the vibration is vibrated. While adding the hydrogen storage alloy holding container, it is brought into contact with a heat transfer medium pipe to exchange heat and recover reaction heat, and then the hydrogen storage alloy from which hydrogen has been released is held at the bottom of the hydrogen storage alloy holding container. A method for recovering reaction heat of a hydrogen storage alloy, characterized by lowering it in a container and recovering it. (3) In a reaction heat recovery apparatus having a hydrogen storage alloy holding container for hydrogen storage or hydrogen release, which collects the heat of reaction when hydrogen is stored and released in a hydrogen storage alloy by exchanging heat with a heat medium pipe. In the storage alloy holding container, a plurality of heat transfer medium pipes are arranged horizontally and in parallel with each other, and a holding container for storing the hydrogen storage alloy is installed above and below the hydrogen storage alloy holding container. A reaction heat recovery device for a hydrogen storage alloy, comprising a vibration exciter for vibrating a container. (4) In a reaction heat recovery device having a hydrogen storage alloy holding container for hydrogen storage or hydrogen release, which collects the heat of reaction when hydrogen is stored and released in a hydrogen storage alloy by heat exchange with a heat medium pipe. The hydrogen storage alloy holding container is provided with a plate-shaped heat transfer medium pipe support member for horizontally arranging a plurality of heat transfer medium pipes in the storage alloy holding container in parallel to each other and supporting the end portions of the heat transfer medium pipes over the entire circumference in the horizontal direction. A reaction heat recovery device for a hydrogen storage alloy, characterized in that it has a vibrating device which is provided inside and vibrates the heat medium pipe supporting member. (5) The hydrogen storage alloy according to the above (3), wherein the lower portion of the hydrogen storage alloy holding container has a conical shape that is squeezed downward, and the inclination of the side surface of the conical shape is 30 degrees or more and 70 degrees or less with respect to the horizontal. Reaction heat recovery equipment. (6) The lower part of the heat medium pipe support member installed in the hydrogen storage alloy holding container has a conical shape that is squeezed downward, and the inclination of the side surface of the conical shape is 30 degrees or more and 70 degrees or less with respect to the horizontal. The reaction heat recovery device for hydrogen storage alloy according to (4) above.

The present invention will be described in detail below. In the present invention, the hydrogen storage alloy 42 that stores hydrogen stored in the upper holding container 2 installed above the hydrogen storage alloy holding container 1 is vibrated and lowered into the holding container 42 to release hydrogen. In addition, while vibrating the cooled hydrogen storage alloy at the time of releasing the hydrogen, the hydrogen storage alloy is brought into contact with the heat medium pipe 9 provided in the holding container to exchange heat and recover the reaction heat. After that, the hydrogen storage alloy from which hydrogen has been released is lowered into the lower holding container installed at the lower part of this holding container and collected. As a result, the crystal lattice expansion and contraction are repeated as the hydrogen is absorbed and released in the hydrogen absorbing alloy. For this reason, the flow of the hydrogen storage alloy is not deteriorated due to the characteristic of being pulverized, so that the effect of promoting heat transfer between the hydrogen storage alloy and the heat transfer medium pipe is connected.

In addition, since the space for separating the heat medium tubes is provided in order to secure the fluidity of the hydrogen storage alloy due to the natural fall, the utilization rate of the heat transfer area becomes low and the heat output is relatively small. There's a problem. Regarding this, by utilizing the large angle of repose of the hydrogen storage alloy to limit the fluidity and discharging by vibration, the reaction with high heat recovery rate by improving the utilization rate of heat transfer area and promoting heat transfer by vibration. Heat recovery can be performed.

According to the measurement by the present inventors, the angle of repose of the hydrogen storage alloy changes depending on the type of alloy and the hydrogen storage amount.
The angle of repose is as large as 45 to 85 degrees, and if the cone portion holding the hydrogen storage alloy is smaller than this angle, the hydrogen storage alloy does not descend. Even when the angle of repose was larger than the angle of repose, the amount of fall of the hydrogen storage alloy was not constant, and the flow of the hydrogen storage alloy was unstable such as clogging or flowing. Also,
The flow of the hydrogen storage alloy was greatly affected by the arrangement of the heat transfer tubes inside, and stable reaction heat recovery was difficult.

In the present invention, the fact that the angle of repose of the hydrogen storage alloy is as high as 40 to 85 degrees is utilized, and the angles of the powder moving parts at the upper part and the lower part of the heat exchanger are set higher than this. deep. Further, by vibrating this, the hydrogen storage alloy can be moved even in the case of a high heat transfer area where the space between the heat transfer tubes is narrow, and the heat transfer area of the heat transfer tube can be fully utilized. .

The inclination of the conical portion depends on the type of the hydrogen storage alloy, but if it is larger than 70 degrees, the effect of preventing the flow of the hydrogen storage alloy becomes small, and if it is smaller than 30 degrees, the vibration for flowing becomes large. Tends to become. Therefore, in a normal hydrogen storage alloy, it is 30 to 70.
It is desirable to perform it with a gradient of degrees. However, it is expected that the hydrogen storage alloy manufactured by the gas atomizing method having a round shape has an inclination angle smaller than 30 degrees due to its excellent fluidity. In addition, since it is expected that a gradient of more than 70 degrees will be required for a hydrogen storage alloy such as foil produced by the quenching method, it is limited to 30 to 70 degrees for a special hydrogen storage alloy. It is not something that will be done.

The positional relationship between the hydrogen storage alloy holding container, the upper holding container and the lower holding container is basically a vertically stacked type, but they are arranged side by side depending on the installation location of the vibration device such as a powder transport device. It is also possible to move the hydrogen storage alloy horizontally.

In order to efficiently exchange heat with the hydrogen storage alloy descending in the hydrogen storage holding container, the heat medium tubes are arranged in the hydrogen storage holding container horizontally in parallel with each other and in a zigzag pattern in the vertical cross section. By arranging it, the heat exchange between the heat medium tube and the hydrogen storage alloy can be improved. A vibrator, a knocker, etc. can be used for the vibration, and an electric force, a gas pressure, etc. can be generally used as the driving force for the vibration, but when a vibration device is installed inside the hydrogen storage alloy reaction vessel, It is desirable to use gas pressure driving in which vibration is generated by moving a weight inside the vibration device using an active gas or the same composition gas.

The vibration force is set to 2 G or more in order to move the powder against the gravitational acceleration, but it is necessary to change the vibration force depending on the particle size distribution of the hydrogen storage alloy. If the particle size is small, the vibration force should be larger than 2 G. There is a need. When a gas pressure driven vibrator is used, the moving speed of the weight inside the vibration device can be changed by changing the gas flow velocity, so the vibration acceleration can be changed and the moving speed of the hydrogen storage alloy can be changed. Can be controlled.

The lower holding container and the upper holding container are connected by a tubular conveyor, and the hydrogen storage alloy is moved from the lower holding container to the upper holding container. Then, the hydrogen storage alloy can be circulated by moving it from the upper holding container to the lower holding container via the hydrogen storage alloy reaction container. As a device for lifting the hydrogen storage alloy from the bottom to the top, a bucket conveyor or the like can be used in addition to the tubular conveyor. A valve such as a butterfly valve may be inserted between the hydrogen storage alloy reaction container and the upper holding container and the lower holding container. By inserting a valve, it becomes easier to inspect the inside of the hydrogen storage alloy reaction vessel.

With respect to the alloy used for hydrogen storage, almost any type of hydrogen storage alloy can be used. Since the Ti-based hydrogen storage alloy generally has a larger particle size distribution, the hydrogen storage alloy used in the method and apparatus of the present invention is preferably Ti-based. However, even in a rare earth-based hydrogen storage alloy that is significantly pulverized, the flow is sufficiently promoted, so that it is possible to obtain a high output.

[0021]

EXAMPLES The present invention will be further described below with reference to examples. FIG. 1 shows an apparatus for vibrating the entire hydrogen storage alloy reaction vessel from the outside in the hydrogen storage / release apparatus of the present invention.
An apparatus for vibrating the inside of the hydrogen storage alloy reaction container is shown in FIG.

In the apparatus for vibrating the heat transfer medium pipe portion shown in FIG. 1 from the outside, an outer diameter 50 for the hydrogen releasing step shown on the left side of FIG.
A hydrogen storage alloy holding container 1 having a length of 0 mm and a length of 500 mm, an upper holding container 2 and a lower holding container 3 having an outer diameter of 300 mm and a length of 500 mm were used. Inside the hydrogen storage alloy holding container 1, a heat medium pipe introduction / extraction pipe 7 for taking out reaction heat of the hydrogen storage alloy (not shown) to the outside is installed. Hydrogen is released from the hydrogen outlet pipe 8.

Further, for the hydrogen storage step shown on the right side of FIG. 1, a hydrogen storage alloy holding container 11 having an outer diameter of 500 mm and a length of 500 mm, an upper holding container 22 having an outer diameter of 300 mm and a length of 500 mm, and a lower holding container 33 are used. I was there. Inside the hydrogen storage alloy holding container 11, heat medium pipe introduction / delivery pipes 77 for taking out reaction heat of a hydrogen storage alloy (not shown) to the outside are installed so as to be horizontal and parallel to each other. Hydrogen is stored in the hydrogen outlet pipe 88.

The vibration is performed by the vibrators 4 and 5 which are alternately installed on the side surface of the hydrogen storage alloy holding container 1 in a direction of 45 degrees with respect to the vertical direction. The hydrogen storage alloy reaction vessels 1 and 11 are supported by a spring 6, and an upper holding vessel, a lower holding vessel, and a spring are supported by a mount 20 (not shown). The lower part of the hydrogen storage alloy holding container has a conical shape that is squeezed downward, and is selected according to the repose angle of the hydrogen storage alloy. In the embodiment, it is set to 45 degrees.

As the hydrogen storage alloy, 34 kg of LaNi ₅ was used and the activation operation was performed. The activation operation is as follows. The hydrogen storage alloy is filled in the upper holding container 2, hot water of about 80 ° C. is caused to flow through the heat medium pipe introduction / extraction pipe 7, and vacuum exhaust is performed. At the same time, the vibrators 4 and 5 are driven and vibrated, and the vibrators 4 and 5 are moved to the lower holding container 3 while being in contact with the heat transfer medium pipe 9 inside the hydrogen storage / release reaction container 1. Next, after moving to the upper holding container 22 by the tubular conveyor 21, cooling water at 25 ° C. is caused to flow through the heat medium pipe introducing / deriving pipe 77 inside the hydrogen storage alloy reaction container 11, and the pressure is 9 kg / cm 2.
Introduce ² hydrogen. Furthermore, the vibrators 4 and 5 are driven and the upper holding container 22 is applied while applying a vibration of 2.2G.
The hydrogen storage alloy therein is brought into contact with the heat transfer medium tube 99 inside the hydrogen storage alloy reaction vessel 11 and moved toward the lower holding vessel 33. Next, after moving to the upper holding container 2 with the tubular conveyor 21, this was repeated 10 times.

After completion of activation, hydrogen is released from the hydrogen storage alloy. After that, it is moved to the upper holding container 22, cooling water at 25 ° C. is caused to flow through the heat medium pipe introduction / extraction pipe 77 inside the hydrogen storage alloy reaction container 11, and hydrogen at a pressure of 9 kg / cm ² is introduced. Further, while driving the vibrators 4 and 5 to apply vibration, the hydrogen storage alloy in the upper holding container 22 is brought into contact with the heat transfer medium tube 99 inside the hydrogen storage alloy reaction container 11,
It was moved toward the lower holding container 33. At this time, the reaction heat at the time of hydrogen storage was taken out to the outside by a heat medium tube, and the heat transfer amount was measured. Also, as a hydrogen storage alloy, Ti _0.62 Zr
_{The same} procedure was performed using _0.8 Mn _0.8 CrCu _0.2 .

In the apparatus for vibrating inside shown in FIG. 2, the gas driving type vibrator 14 is installed on the heat medium pipe supporting tube support plate 100 which supports the heat medium pipe portion over the entire circumference in the horizontal direction, and the driving gas is driven. The gas is introduced and led out by the gas introduction and delivery pipe 15. The tip of the heat medium tube support member inside the hydrogen storage alloy holding container was a conical shape that was squeezed downward, and the side surface of the conical shape was inclined at 45 degrees with respect to the horizontal. The activation operation was performed in the same manner as in the device of FIG. 34 kg of LaNi ₅ was used as the hydrogen storage alloy, and after releasing hydrogen from the hydrogen storage alloy, it was moved to the upper holding container 22,
Heat medium pipe introduction and extraction pipe 7 inside the hydrogen storage alloy reaction container 11
Cooling water at 25 ° C. is caused to flow into 7, and hydrogen having a pressure of 9 kg / cm ² is introduced. Furthermore, while driving the gas-driven vibrator 14 to apply vibration, the hydrogen storage alloy in the upper holding container 22 is heated by the heat transfer pipe 9 inside the hydrogen storage alloy reaction container 11.
9 and was moved toward the lower holding container 33. At this time, the reaction heat at the time of hydrogen storage was taken out to the outside by a heat medium tube, and the heat transfer amount was measured. The same procedure was performed using Ti _0.62 Zr _0.8 Mn _0.8 CrCu _0.2 as the hydrogen storage alloy.

The results of Examples and Comparative Examples are summarized in Table 1. In the comparative example, the flow is hindered by the pulverization of the hydrogen storage alloy and the heat transfer surface is not used effectively. On the other hand, in the examples, the amount of heat transfer increases even when the particle size is small, indicating that the heat of reaction when the hydrogen storage alloy stores hydrogen is rapidly recovered. Although not shown in the examples, even when hydrogen is released from the hydrogen storage alloy, the heat transfer surface is effectively used by the vibration, and the heat transfer, which is a rapid reaction, is promoted, and hydrogen is released to the hydrogen storage alloy. It was possible to recover the heat quickly in the reaction heat.

[0029]

[Table 1]

From the above, it can be seen that it is possible to increase the amount of heat transfer and accelerate the reaction by using the reaction heat recovery method and reaction heat recovery apparatus for a hydrogen storage alloy of the present invention.

[0031]

EFFECTS OF THE INVENTION By using the reaction heat recovery method and apparatus for recovering hydrogen storage alloy of the present invention, the utilization factor of the heat transfer surface is improved and the heat transfer is promoted by vibration, so that the hydrogen storage alloy and the heat transfer pipe are The amount of heat transfer during that time becomes high, and heat can be recovered quickly. As a result, it is possible to effectively use a heat pump, a hydrogen storage device, a raw water purification device, an actuator, a heat storage, etc. as a system using the hydrogen storage alloy.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an apparatus for externally vibrating a hydrogen storage alloy reaction container according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing an apparatus for vibrating the inside of a hydrogen storage alloy reaction container according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a container holding a hydrogen storage alloy in which a heat transfer medium pipe is provided in the container.

FIG. 4 is a cross-sectional view of a container holding a hydrogen storage alloy in which a heat transfer medium pipe is provided outside the container.

[Explanation of symbols]

1,11,41,51 Hydrogen storage alloy holding container 2,22 Upper holding container 3,33 Lower holding container 4,5 vibrator 6 spring 14 Gas-driven vibrator 15 Driving gas inlet / outlet pipe 7,77 Heat medium pipe introduction and extraction pipe 8,88 Hydrogen outlet pipe 9,99 Heat medium pipe 20 mounts 21 tubular conveyor 100 Heat medium tube support member 42 52 Hydrogen storage alloy 43,53 filter 44 Heat medium piping in container 54 Heat medium piping outside the container

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Iida 20-1 Shintomi, Futtsu City Nippon Steel Co., Ltd. Technical Development Division (72) Inventor Masao Nakajima 3-10-10 Iwamotocho, Chiyoda-ku, Tokyo No. 1 in Mitsui Construction Co., Ltd. (56) Reference JP-A-4-309762 (JP, A) JP-A-2-120201 (JP, A) JP-A-63-140261 (JP, A) JP-B 4- 44601 (JP, B2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F25B 17/12 B01J 19/00 C01B 3/00 F17C 11/00

Claims (6)

(57) [Claims] 1. A reaction heat recovery method for a hydrogen storage alloy, wherein heat generated by an exothermic reaction when hydrogen is stored in a hydrogen storage alloy is exchanged by a heat medium tube to recover the heat, and the reaction heat recovery method is installed at an upper portion of a hydrogen storage alloy holding container. While vibrating the hydrogen storage alloy stored in the upper holding container, the hydrogen storage alloy holding container is lowered into the hydrogen storage alloy holding container so that hydrogen is stored in the hydrogen storage alloy holding container. After contacting the heat transfer medium tube with the hydrogen storage alloy that generated heat during storage, heat exchange was performed to recover the reaction heat, and then the hydrogen storage alloy that stored hydrogen was dropped to the lower holding container installed at the bottom of the hydrogen storage alloy holding container. A method for recovering reaction heat of a hydrogen storage alloy, characterized by recovering and recovering the hydrogen storage alloy. 2. A reaction heat recovery method for a hydrogen storage alloy, wherein heat generated by an endothermic reaction when releasing hydrogen from a hydrogen storage alloy is exchanged by a heat medium tube to recover the hydrogen, and the reaction heat recovery method is installed at an upper portion of a hydrogen storage alloy holding container. While lowering the hydrogen storage alloy holding hydrogen stored in the upper holding container into the hydrogen storage alloy holding container while vibrating the hydrogen storage alloy holding container, hydrogen is released in the hydrogen storage alloy holding container, and the hydrogen storage alloy cooled at the time of release is released. While vibrating, the heat storage tube provided in the hydrogen storage alloy holding container was brought into contact with the heat transfer medium to exchange heat to recover reaction heat, and then the hydrogen storage alloy that released hydrogen was placed at the bottom of the hydrogen storage alloy holding container. A method for recovering reaction heat of a hydrogen storage alloy, characterized by lowering it to a lower holding container and recovering it. 3. A reaction heat recovery device having a hydrogen storage alloy holding container for hydrogen storage or hydrogen release, which recovers the heat of reaction when hydrogen is stored and released in a hydrogen storage alloy by exchanging heat with a heat transfer medium pipe. In the hydrogen storage alloy holding container, a plurality of heat transfer medium pipes are arranged in parallel with each other in a horizontal direction, and a holding container for storing the hydrogen storage alloy is installed above and below the hydrogen storage alloy holding container. A reaction heat recovery device for hydrogen storage alloy, comprising a vibrating device for vibrating the alloy holding container. 4. A reaction heat recovery apparatus having a hydrogen storage alloy holding container for hydrogen storage or hydrogen release for recovering the heat of reaction when hydrogen is stored and released in a hydrogen storage alloy by heat exchange with a heat transfer medium pipe. In the hydrogen storage alloy holding container, a plurality of heat transfer medium tubes are horizontally arranged in parallel with each other, and a plate-shaped heat transfer medium tube support member for supporting the end portions of the heat transfer medium tubes in the horizontal direction is provided as the hydrogen storage alloy. A reaction heat recovery device for a hydrogen storage alloy, characterized in that it has a vibration exciter which is provided in a holding container and vibrates the heat medium pipe supporting member. 5. The hydrogen storage alloy holding container has a lower portion having a conical shape that is squeezed downward, and the inclination of the side surface of the conical shape is 30 degrees or more and 70 degrees or less with respect to the horizontal. Item 3. A reaction heat recovery device for hydrogen storage alloy according to Item 3. 6. A lower part of the heat medium pipe supporting member installed in the hydrogen storage alloy holding container has a conical shape that is squeezed downward.
The inclination of the side surface of the conical shape is 30 degrees or more with respect to the horizontal 70
The reaction heat recovery device for hydrogen storage alloy according to claim 4, wherein the reaction heat recovery device is less than 100 degrees.