JPH05296677A - Hydrogen absorbing and discharging heat exchanger - Google Patents

Abstract

PURPOSE:To provide a hydrogen absorbing and discharging heat exchanger, realizing the reduction of the diameter of respective alloy filling vessels and improving the heat exchanging efficiency thereof. CONSTITUTION:In a hydrogen absorbing and discharging heat exchanger, two sets of low-temperature side and high temperature side heat exchangers, which are accommodating hydrogen storage alloys having different hydrogen equilibrium pressures and capable of effecting heat exchange, are constituted of the assembled body of finned tube type alloy filling vessels 201, 204 filled with hydrogen storage alloys respectively while a hydrogen pipeline 202 is connected to one end of the finned tube type alloy filling vessels 202, 204 and alloy filling tubes 208, 213 for filling the hydrogen storage alloy are connected to the other ends of the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrogen absorbing / releasing heat exchanger which generates cold heat or warm heat by absorbing / releasing hydrogen by a hydrogen storage alloy.

[0002]

2. Description of the Related Art In recent years, two heat exchangers, each containing two kinds of hydrogen storage alloys having different hydrogen equilibrium pressures, are connected to each other, and transfer and regeneration of hydrogen between the heat exchangers are used for continuous cooling and heating. Various cooling and heating devices for operation have been proposed.
As a heat exchanger used in the apparatus, for example, Japanese Patent Laid-Open No. 60-69465 discloses a plurality of fin-filled tube-type alloy filled containers filled with a hydrogen storage alloy and a porous metal body surrounding a hydrogen filter. There has been proposed an air-cooling type heat exchanger that is bundled in parallel to form an assembly.

[0003]

However, in such a heat exchanger, it is necessary to previously insert a hydrogen filter into each alloy filling container and fill a hydrogen storage alloy therein, and to reduce the diameter of each alloy filling container. Was difficult. Therefore, the heat transfer efficiency between the hydrogen storage alloy filled in each alloy filling container and the fin portion was poor.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a hydrogen absorption / desorption heat exchanger in which the diameter of each alloy filled container is reduced and the heat exchange efficiency is improved. And

[0005]

According to the present invention, in a hydrogen absorption / desorption heat exchanger, two heat exchanging heat exchanging vessels, each of which has a hydrogen absorbing alloy having a different hydrogen equilibrium pressure and is capable of exchanging heat, are respectively provided. The fin-shaped tubular alloy filling container is filled with the hydrogen-absorbing alloy, and a hydrogen pipe is connected to one end of the fin-filled tubular alloy filling container and the hydrogen is connected to the other end. The hydrogen absorption / desorption heat exchanger is characterized in that an alloy filling tube for filling the storage alloy is provided.

[0006]

According to the present invention, it is possible to reduce the diameter of a finned tubular alloy filling container, improve the heat transfer coefficient, and manufacture a hydrogen absorption / desorption heat exchanger having high heat exchange efficiency.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the hydrogen absorbing / releasing heat exchanger of the present invention is applied to keeping cold in a flower growing system will be described in detail below with reference to the drawings. The flower growing system here is equipped with a cooling device that supplies cold heat to the showcase that stores the flowers, in order to supply the most suitable temperature and humidity for the flowers, adjust the flowering time, and extend the life of the flowers. It is a thing.

FIG. 1 is a schematic perspective view of the flower growing system, FIG. 2 is a schematic side sectional view of the flower growing system shown in FIG. 1, and 1 is a casing forming the outer shape of the flower growing system.
Is a showcase (capacity: about 1 m ³ ) that occupies the upper part of the housing 1 and stores flowers. 3 is a cooling device (80 cm × 100) that is located below the showcase 2 and supplies cold to the showcase 2.
cm × height 60 cm).

As shown in FIG. 2, the cooling device 3 is located below the showcase 2 and has a regenerator 4 (75 cm × 35.8 cm × height 1) filled with 3 kg of paraffinic regenerator material having a melting point of 9 ° C.
5.4 cm) and located below the regenerator 4, [Chemical 1]
Hydrogen storage alloy A shown in

[0010]

[Chemical 1]

A low temperature side heat exchange container 5 filled with 12 kg of
The low temperature side heat exchange container 5 (79 cm x 30 cm x height 18.
5 cm) below, and hydrogen storage alloy B having a hydrogen equilibrium pressure lower than that of hydrogen storage alloy A at the same temperature shown in [Chemical formula 2].

[0012]

[Chemical 2]

High temperature side heat exchange container 6 (7) filled with 12 kg of
9 cm × 30 cm × height 18.5 cm), a fan 7 provided near the low temperature side heat exchange container 5 for forming an air flow to be sent to the regenerator 4 and the showcase 2, and a high temperature side heat exchange container 6. And a fan 8 for forming an air flow for discharging the heat generated in the high temperature side heat exchange container 6 to the outside of the device 3 when the low temperature side heat exchange container 5 generates cold heat, and the high temperature side heat exchange container 6 A heater (not shown) provided inside the showcase 2 for generating heat when the low temperature side heat exchange container 5 is regenerated;
And, the dampers 10 to 12 for switching the communication states of the regenerator 4 and the low temperature side heat exchange container 5 to supply cold heat to the showcase 2, and the communication states of the high temperature side heat exchange container 6 and the outside air. A damper 13 for discharging warm heat to the outside of the device 3 is configured. The low temperature side heat exchange container 5 and the high temperature side heat exchange container 6 are connected by a hydrogen pipe described later so that hydrogen can move between them.
The dampers 10 to 13 are rotatably supported by an AC motor (not shown).

Further, the showcase 2 is provided with a fan 14 for sucking cold heat generated in the regenerator 4 and the low temperature side heat exchange container 5 and forming an air flow to be circulated in the showcase 2. ing. It should be noted that the fans 7, 8 and 14 have a cross flow fan (maximum suction flow rate without load: 10 m ³ / in order to equalize the air flow and reduce noise when the fan is driven).
min, maximum output 30 W) is used.

Next, the structure of the regenerator 4 will be described with reference to FIGS. 3 is an external view of the regenerator 4 seen from the surface shown in FIG. 2, and FIG. 4 is a side view of FIG.

As shown in the figure, the regenerator 4 is connected in series with 98 cylindrical regenerator materials 101 (diameter: 1 cm, length: 70 cm) by a U-shaped tube 102 and is filled with paraffinic regenerator material. After pouring from the end 103 and filling the regenerator material, the filling end 103 is sealed. And each regenerator material container 1
A large number of aluminum fins 104 are juxtaposed outside 01 with a pitch of about 2 mm.

As shown in FIG. 5, each regenerator material container 101 has an aluminum fin 104 inside and an internal transfer made of aluminum for efficiently transmitting the cold heat in the regenerator material container 101 to the regenerator material 105. A promoter 106 is provided. Thereby, the cold heat from the low temperature side heat exchange container 5 is efficiently stored in the regenerator 4.

Next, the structures of the low temperature side heat exchange container 5 and the high temperature side heat exchange container 6 will be described with reference to FIGS. 6 to 9.

FIG. 6 is an external view of the low temperature side heat exchange container 5 and the high temperature side heat exchange container 6 as seen from the surface shown in FIG.
7 is a side view of FIG. 6, FIG. 8 is a cross-sectional view of an essential part of the low temperature alloy filling container shown in FIG. 6, and FIG. 9 is a cross-sectional view of an essential part of the high temperature alloy filling container shown in FIG. Is.

As shown in FIGS. 6 and 7, the low temperature side heat exchange vessel 5 comprises 33 cylindrical low temperature side alloy filling vessels 201 (diameter 1.6 cm, length 70 cm) connected in parallel. Each low temperature side alloy filling container 201 is connected to the high temperature side heat exchange container 6 via a common hydrogen pipe 202 having a valve (not shown) in the middle, and at the same time sucks and exhausts hydrogen gas.

Each low temperature side alloy filling container 201 is filled with the above hydrogen storage alloy A, and a large number of aluminum fins 203 are mounted outside at a pitch of about 5 mm.

Similarly, the high temperature side heat exchange container 6 is also composed of 33 cylindrical high temperature side alloy filling containers 204 (diameter 1.6 cm, length 70 cm). And
Each high temperature side alloy filling container 204 is connected to the low temperature side heat exchange container 5 via a common hydrogen pipe 202 having a valve in the middle.
At the same time, hydrogen gas is sucked and exhausted, the above-mentioned hydrogen storage alloy B is enclosed in each high temperature alloy filling container 204, and a large number of aluminum fins 205 are mounted outside at a pitch of about 5 mm.

As shown in FIG. 8, each low temperature side alloy filling container 201 is connected to a hydrogen pipe 202 at one end thereof, and each low temperature side alloy filling container 201 is connected to a hydrogen intake / exhaust hole 205 of the hydrogen pipe 202. A hydrogen filter 207 for circulating hydrogen gas is connected to a substantially central portion of the hydrogen storage alloy A. The hydrogen filter 207 is formed of a porous filter such as sintered metal or glass wool,
The hydrogen gas is evenly distributed from the beginning to the end of each low temperature alloy filling container 201. At the other end of each low temperature alloy filling container 201, an alloy filling pipe 2 for filling the hydrogen absorbing alloy A into each low temperature alloy filling container 201 is provided.
08 is connected to the alloy filling pipe 2 after filling the alloy.
The outer exposed end of 08 is sealed. As described above, the hydrogen pipe 202 and the alloy filling pipe 208 are connected to the low temperature side alloy filling containers 201, respectively.
Since it was performed at the opposite end of No. 1, each low temperature alloy filling container 2
The diameter of 01 can be reduced, and as a result, heat transfer efficiency and operability are improved.

Further, inside the both ends of each low temperature side alloy filling container 201 where the aluminum fins 203 are not attached, a ceramic fiber type heat insulating material 209 such as kao wool is provided so as to sandwich the hydrogen storage alloy A. The heat insulating material 209 absorbs a change in volume when the hydrogen storage alloy A absorbs and discharges hydrogen, and also prevents a reduction in cold heat generation efficiency due to a heat effect in a portion where the aluminum fins 203 are not provided.

Next, each high temperature alloy filling container 204 is connected to a hydrogen pipe 202 at one end thereof as shown in FIG.
A hydrogen filter 212 for allowing hydrogen gas to flow above the hydrogen storage alloy B of each high temperature alloy filling container 204 is connected to the hydrogen intake / exhaust hole 210 of 02. The hydrogen filter 212 is the same as the hydrogen filter 207. And each high temperature side alloy filling container 2
An alloy filling pipe 213 for filling the hydrogen storage alloy B is connected to the other end of 04, and the outer exposed end of the alloy filling pipe 213 is sealed after filling the alloy.

Further, a heater 21 for heating the hydrogen storage alloy B is provided below the high temperature alloy filling container 204.
An insertion hole 215 for inserting 4 from the same side as the alloy filling tube 213 is provided. Therefore, this insertion hole 215
By providing the heating heater 21 even after each high temperature side alloy filling container 204 is filled with the hydrogen storage alloy B.
4 can be easily replaced and inspected. Further, in each high temperature side alloy filling container 204, a heater 214
Is located at the lower part in order to eliminate heating unevenness due to rise in heat. The heater 214 is made of nichrome wire and heats the hydrogen storage alloy B of each high temperature alloy filling container 204 to 110 ° C. when the low temperature side heat exchange container 5 is regenerated. Further, for the same purpose as the low temperature side alloy filling container 201, the ceramic fiber type heat insulating material 216 is sandwiched inside the both ends of each high temperature side alloy filling container 204 where the aluminum fins 205 are not attached. Is provided.

As described above, each high temperature side alloy filling container 20
Of the alloy filling pipe 213 to the No. 4 and the heater 2
Since 14 was inserted from the end opposite to the connection end of the hydrogen pipe 202, the diameter of each high temperature alloy filling container 204 can be reduced, and as a result, heat transfer efficiency and operability are improved. ..

Next, the cooling operation in the flower growing system having the above-mentioned structure will be described with reference to FIGS. 10 and 11 separately for the cold heat generation mode and the regeneration mode of the low temperature side heat exchange container 5. [Cold heat generation mode] In the initial state, the low temperature side heat exchange container 5
The hydrogen storage alloy A inside has a hydrogen equilibrium pressure at a high temperature side heat exchange container 6
It is higher than the hydrogen storage alloy B inside, and when the valve of the hydrogen pipe 202 is opened, hydrogen dissociates from the hydrogen storage alloy A and moves to the hydrogen storage alloy B. At this time, the low temperature side heat exchange container 5 becomes an endothermic reaction, and the high temperature side heat exchange container 6 becomes an exothermic reaction.

The valve of the hydrogen pipe 202 has a hydrogen flow rate of 15 l / in order to prevent noise from being generated when the valve is opened.
The valve opening is controlled so that it is below min (25 ° C, 1 atm, 1 kg of filled hydrogen storage alloy).

Further, as shown in FIG.
In the state of 3, the dampers 10 and 11 are in communication with the showcase 2, the regenerator 4, and the low temperature side heat exchange container 5.
The damper 12 is placed at an oblique position where the communication between the showcase 2 and the regenerator 4 is restricted to a closed position outside the device 3, and the damper 13 is placed at a horizontal position where the high temperature side heat exchange container 6 and the outside air are in communication. is there. The damper 12 is arranged in an oblique position in order to always supply a part of the cold heat from the low temperature side heat exchange container 5 to the regenerator 4. The fans 7, 8 and 14 are all driven at an output of 30W.

At this time, cold heat of about 0 ° C. is generated in the low temperature side heat exchange container 5, and the cold hot air is supplied to the showcase 2 and the regenerator 4 as shown in FIG.
Is cooled to about 13 ° C., and excess cold heat is supplied to the regenerator 4 to cool the regenerator 4 to about 5 ° C. Further, the heat generated in the high temperature side heat exchange container 6 is sucked by the fan 8 and the high temperature side exhaust hole 30.
1 is discharged to the outside of the device 3, and the high temperature side heat exchange container 6 is maintained at about 30 ° C. The arrow in the figure indicates the direction of the air flow at that time.

After performing the above-described cold heat generation process for 19 minutes, a preliminary operation process I for shifting to a regeneration mode described later is performed.

In the preliminary operation process I, the damper 10 is rotated to close the low temperature side suction hole 302, and at the same time, the damper 13 is rotated to the vertical position where the high temperature side heat exchange container 6 and the outside air are shut off from each other. Then, the heater 214 is activated. Then, the drive output of the fan 7 is reduced to 20 W and the fan 8 is stopped. The heater 214
During start-up, the applied voltage control is individually performed so that the outputs of the temperature sensors provided at the upper portion and the lower portion of the high temperature side heat exchange container 6 are 110 ° C., respectively. Further, the valve of the hydrogen pipe 202 is closed at the same time when the cold heat generation process is completed.

Then, the low temperature side suction hole 3 is provided by the damper 10.
After closing 02, the damper 11 is rotated to a position where the air from the low temperature side exhaust hole 303 is discharged to the outside of the device 3, and
Rotate the damper 12 to the vertical position.

Therefore, the damper 10 is first rotated without rotating the dampers 10 and 11 simultaneously, and the low temperature side suction hole 302 is formed.
Since the damper 11 is rotated after closing the valve, the air that has undergone heat exchange in the low temperature side heat exchange container 5 based on the cooling air in the showcase 2 does not leak to the outside of the device 3 and the cooling efficiency of the system is improved. Leads to improvement of.

After performing the above preliminary operation process I for 3 minutes, the following reproduction mode is performed. [Regeneration Mode] After the completion of the preliminary operation process I, the high temperature side heat exchange container 6 is heated to 110 ° C. by the activation of the heater 214.
Since the hydrogen storage alloy B in the high temperature side heat exchange container 6 has a hydrogen equilibrium pressure higher than that of the hydrogen storage alloy A in the low temperature side heat exchange container 5, when the valve of the hydrogen pipe 202 is opened, hydrogen is absorbed. Hydrogen is dissociated from storage alloy B and hydrogen storage alloy A
Move to.

At this time, as shown in FIG. 11, cold air of about 7 ° C. is supplied from the regenerator 4 to the showcase 2,
While continuing to cool the inside of showcase 2 to approximately 13 ° C,
The heat generated by the heat generated in the low temperature side heat exchange container 5 after the hydrogen is returned is released to the outside air through the low temperature side exhaust hole 303, and the temperature rise of the low temperature side heat exchange container 5 is maintained at about 33 ° C. still,
The arrow in the figure indicates the direction of the air flow at that time.

The valve of the hydrogen pipe 202 has a hydrogen flow rate of 15 l / min (25 ° C., 1 atmosphere, per 1 kg of filled hydrogen storage alloy) in order to prevent noise from being generated by opening the valve, as in the cold heat generation process. The valve opening control is performed as follows.

After the regeneration process is performed for 19 minutes, a preliminary operation process II for shifting to the cold heat generation mode is performed.

In the preliminary operation process II, first, the damper 10 is rotated to the closed position with respect to the outside of the device 3, and at the same time, the damper 13 is rotated to the horizontal position where the high temperature side heat exchange container 6 and the outside air are in communication with each other. Then, the heater 214 is shut off. Then, while driving the fan 8 at an output of 30 W,
The fan 7 is driven with an output of 20 W as in the reproducing process. Further, the valve of the hydrogen pipe 202 is closed at the same time when the regeneration process is completed.

Then, the low temperature side suction hole 3 is provided by the damper 10.
After opening 02, the damper 11 is rotated to a closed position with respect to the outside of the apparatus 3, and the damper 12 is rotated to an oblique position.

Therefore, the damper 10 is first rotated without rotating the dampers 10 and 11 simultaneously, and the low temperature side suction hole 302 is formed.
Since the damper 11 is rotated after opening, the warm heat in the low temperature side heat exchange container 5 is not supplied to the showcase 2 during the regeneration process, and the cooling efficiency of the system is improved.

After performing this preliminary operation process II for 3 minutes,
The process proceeds to the cold heat generation process described above. Then, the cooling operation is continuously performed by repeatedly performing the regeneration mode and the cold heat generation mode.

As described above, in the reproduction process and the preliminary operation processes I and II, the rotation of the dampers 10 and 11 brings the fan 7 and the outside of the device 3 into communication with each other, and drives the fan 7 to the outside of the device 3. Since the sound easily leaks, the fan 7 is driven with an output smaller than the drive output in the cold heat generation process.
We are trying to maintain the quietness of the system.

[0045]

As described above, according to the present invention, it is possible to reduce the diameter of a finned tubular alloy filling container, improve the heat transfer coefficient, and manufacture a hydrogen absorption / desorption heat exchanger having high heat exchange efficiency. You can

Therefore, a compact hydrogen absorption / desorption heat exchanger capable of efficiently exchanging heat with the hydrogen storage alloy is provided.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a flower growing system using a hydrogen absorption / desorption heat exchanger of the present invention.

FIG. 2 is a side sectional view of the flower growing system of FIG. 1 embodiment.

FIG. 3 is an external view of the regenerator viewed from the surface shown in FIG.

FIG. 4 is a side view of FIG.

5 is a schematic perspective view of each cold storage material container shown in FIG. 3. FIG.

6 is an external view of the low temperature side heat exchange container and the high temperature side heat exchange container as viewed from the surface shown in FIG. 2. FIG.

FIG. 7 is a side view of FIG.

FIG. 8 is a cross-sectional view of essential parts of the low temperature alloy filling container shown in FIG.

9 is a cross-sectional view of essential parts of the high temperature side alloy filling container shown in FIG.

FIG. 10 is a system schematic view showing an operation in a cold heat generation process of a flower growing system using the hydrogen absorption / desorption heat exchanger of the present invention.

FIG. 11 is a system schematic view showing an operation in a regeneration process of a flower growing system using the hydrogen absorption / desorption heat exchanger of the present invention.

[Explanation of symbols]

 1 Case 2 Showcase 3 Cooling Device 4 Regenerator 5 Low Temperature Side Heat Exchange Container 6 High Temperature Side Heat Exchange Container 7, 8, 14 Fans 10-13 Damper 201 Low Temperature Side Alloy Filling Container 202 Hydrogen Piping 203, 205 Aluminum Fin 204 High Temperature Side alloy filling container 207, 212 Hydrogen filter 208, 213 Alloy filling tube 209, 216 Ceramic fiber heat insulating material 214 Heating heater (heating means) 215 Heater insertion hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Nasako, 2-18 Keihan Hon-dori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Koichi Sato 2--18, Keihan Hon-dori, Moriguchi City, Osaka Sanyo Inside the Electric Co., Ltd. (72) Shin Fujitani, 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inside Ikuro Yonezu, 2-18 Keihan Main Street, Moriguchi, Osaka Sanyo Electric Co., Ltd. (72) Masato Osumi, Inventor 2-18, Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A low temperature side heat exchange container containing a hydrogen storage alloy having a high hydrogen storage pressure, a high temperature side heat exchange container containing a hydrogen storage alloy having a low hydrogen storage pressure, and the low temperature side and high temperature side heat exchanges. In a hydrogen absorption / desorption heat exchanger having a hydrogen pipe for communicating between the containers to form a hydrogen path, the low temperature side and the high temperature side heat exchange containers are fin-filled tubular alloy filled with the hydrogen storage alloy, respectively. In addition to having a structure of a container assembly, the hydrogen pipe is connected to one end of the finned tubular alloy filling container, and an alloy filling pipe for filling the hydrogen storage alloy is provided at the other end. A hydrogen absorbing / releasing heat exchanger characterized by being 2. The fin type tubular alloy filling container of the low temperature side and high temperature side heat exchange containers is provided with ceramic fiber type heat insulating materials for sandwiching the hydrogen storage alloy inside both ends without fins. Claim 1 characterized by the above.
The described hydrogen absorption / desorption heat exchanger. 3. The finned tubular alloy filling container of the high temperature side heat exchange container is provided with heating means for heating the hydrogen storage alloy, and the heating means is the same as the connecting end of the alloy filling tube. The hydrogen absorption / desorption heat exchanger according to claim 1 or 2, wherein the hydrogen absorption / desorption heat exchanger is inserted from the side. 4. The finned tubular alloy filling container of the high temperature side heat exchange container is provided with an insertion hole for allowing the heating means to be inserted from the same side as the connecting end of the alloy filling pipe. The hydrogen absorbing / releasing heat exchanger according to claim 3.