JPH11270795A - Moving layer/fixed layer connecting system utilizing hydrogen storage alloy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve thermal efficiency and economic efficiency by connecting the hydrogen storage alloy utilizing facility of a moving layer system with that of a fixed layer system having a reaction container concurrently used for hydrogen storage and discharge. SOLUTION: The container A of a moving layer receives a medium from an exhaust heat source 1 and discharges hydrogen, and its container B dedicatedly stores hydrogen. When the container C discharges hydrogen and the container D stores hydrogen, Va, Vb are closed, and Vc, Vd are opened. When the container C stores hydrogen and the container D discharges hydrogen, Va, Vb are opened, and Vc, Vd are closed. When the container C discharges hydrogen and the container D stores hydrogen, the container C is connected to a cooling water tank 2, and the container D is connected to a cooling tower 3. When the container C stores hydrogen and the container D discharges hydrogen, the container C is connected to the cooling tower 3, and the container D is connected to the cooling water tank 2. The exhaust heat recovery side is used as the moving layer, the heat generation side is used as a fixed layer. When the excellent characteristics of the moving layer and the fixed layer are combined, the exhaust heat generation side can be adapted to a factory area, the heat utilization side can be adapted to a general house, and the whole thermal efficiency and economical efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving bed / fixed bed connection system using a hydrogen storage alloy.

[0002]

2. Description of the Related Art Conventionally, in a heat utilization system using a hydrogen storage alloy, a pressure difference between two different hydrogen storage alloys is calculated by compressing one of the hydrogens in order to perform hot and cold production of a drive source. Make the difference and activate the system. In recent years, a technique for compressing hydrogen using heat and a hydrogen storage alloy has been developed. The hydrogen storage alloy has a storage density 1000 times higher than that of gaseous hydrogen, and has characteristics as shown by the following reaction formula. Hydrogen _{storage: M + H 2 → MH 2} + Q ( exothermic reaction) the hydrogen _{release: MH 2 → M + H 2} - Q ( endothermic reaction) M: hydrogen storage alloy, H _2: hydrogen, MH _2: metal hydrides, Q: Heat of reaction (> 0) In this reaction, hydrogen is occluded when the temperature is decreased or the pressure is increased, and hydrogen is released when the temperature is increased or the pressure is decreased. In addition, heat is generated when hydrogen is absorbed, and heat is absorbed when hydrogen is released, and the temperature decreases. Among these features, hydrogen can be compressed using the property that hydrogen is released from the hydrogen storage alloy when the temperature is increased.

[0003] That is, a container is filled with a hydrogen storage alloy,
Here, hydrogen is introduced and hydrogen is sufficiently absorbed in the hydrogen storage alloy. Thereafter, when the container is closed and heat is applied to the hydrogen storage alloy to increase the temperature, the pressure in the container increases to the equilibrium pressure of the hydrogen storage alloy at that temperature. LaNi ₅ which is a typical hydrogen storage alloy has a hydrogen pressure of about 2 kg / cm ² at 25 ° C. By heating the hydrogen storage alloy at about 100 ° C., a hydrogen pressure of about 10 kg / cm ^{2 is} reduced. Can be produced. Hydrogen can be compressed by an apparatus characterized by this method.

As described above, in a conventional hydrogen compression device using a hydrogen storage alloy, when storing hydrogen with the same device, the reaction vessel filled with the hydrogen storage alloy is cooled to compress and release the hydrogen. At that time, the reaction vessel filled with the hydrogen storage alloy was heated. For this reason, there has been a problem that the energy for heating is large because the operation of heating the cooled reaction vessel is repeated. In order to solve this drawback, for example, as disclosed in Japanese Patent Application Laid-Open No. 9-249401, a hydrogen storage reaction section and a hydrogen release reaction section are separated to provide a conventional reaction vessel cooled and cooled during hydrogen storage. Since there is no heat loss when heating the reactor, or heat loss when cooling the reaction vessel that is heated and heated when releasing hydrogen,
It is said that hydrogen can be compressed with less heat energy.

[0005]

However, the exhaust heat recovery side, which is the hydrogen storage reaction section described above, is a fixed layer, and the heat generation side of the hydrogen release reaction section is also a fixed layer. Combinations are common. In that case, the waste heat recovery side is often large and in the factory area,
Also, the heat utilization side is likely to be a general house such as an office building, and the moving layer is easy to scale up and inexpensive, but the transport device is attached and the volume is large, and the fixed layer is easy to handle. When it becomes large, it is necessary to be small from the viewpoint of safety in view of the expansion characteristics of the hydrogen storage alloy. As a countermeasure, in the present invention, a moving layer / fixed layer using a hydrogen storage alloy that improves the overall thermal efficiency and economy by using a fixed layer on the exhaust heat recovery side and a fixed layer on the heat generation side. It provides a connection system.

[0006]

The gist of the invention is as follows. (1) A hydrogen releasing reaction vessel is connected in series with a lower part of a hydrogen storing reaction vessel, and an upper part of the hydrogen storing reaction vessel is connected to hydrogen. The lower part of the desorption reaction vessel is connected by a hydrogen storage alloy transfer device, or the desorption reaction vessel is connected in series with the upper part of the hydrogen storage reaction vessel, and the lower part of the hydrogen storage reaction vessel is connected to the desorption reaction of hydrogen. A moving bed type hydrogen storage alloy utilization facility that moves the hydrogen storage alloy connected to the upper part of the vessel by a hydrogen storage alloy transfer device, and a fixed bed type hydrogen storage alloy where the reaction vessel serves both for hydrogen storage and hydrogen release A moving bed / fixed bed connection system using a hydrogen storage alloy, wherein utilization equipment is connected.

(2) A moving bed type hydrogen storage alloy comprising at least one hydrogen storage alloy utilization facility having a hydrogen storage reaction vessel and a hydrogen release reaction vessel and at least one fixed bed hydrogen storage alloy utilization facility. The utilization equipment continuously converts low-pressure hydrogen into high-pressure hydrogen using heat as the driving source, and the fixed-bed hydrogen storage alloy utilization equipment performs the storage operation using the high-pressure hydrogen as the driving source, and at the same time, another fixed-bed hydrogen storage alloy. The utilization equipment is a moving bed / fixed bed connection system using a hydrogen storage alloy, which is characterized by causing a hydrogen release reaction.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram showing a moving layer / fixed layer connection system in the case of one fixed layer according to the present invention.
As shown in FIG. 1, the container A of the moving bed receives a medium from the exhaust heat source 1 and releases hydrogen, and the container B is exclusively used for storing hydrogen. On the other hand, when the container C releases hydrogen and the container D stores, Va and Vb are closed and Vc and Vd are open. When the container C stores hydrogen and the container D releases,
Va and Vb are open, and Vc and Vd are closed. When the container C releases hydrogen and the container D stores, the container C is
And the container D is connected to the cooling tower 3. When container C absorbs hydrogen and container D releases it,
The container C is connected to the cooling tower 3, and the container D is connected to the cold water tank 2.

FIG. 2 is a schematic diagram showing a moving layer / fixed layer connection system in the case of two fixed layers according to the present invention. As shown in FIG. 2, the container A of the moving bed receives a medium from the exhaust heat source 1 and releases hydrogen, and the container B is exclusively used for storing hydrogen while being cooled by the cooling tower 3. Therefore, hydrogen is continuously or intermittently released from the container A exclusively for hydrogen, and the container B is exclusively used for absorbing hydrogen. On the other hand, when the container C releases hydrogen and the container D stores, Va and Vb are closed, Vc and Vd are open, and the container C
Absorbs hydrogen and releases from container D, Va, Vb
Is open and Vc and Vd are closed. Container C releases hydrogen,
When the container D stores, the container C is connected to the cold water tank 2 and the container D is connected to the cooling tower 3. Container C
Absorbs hydrogen and releases the container D, the container C is connected to the cooling tower 3 and the container D is connected to the cold water tank 2.

When there is a container E and a container F connected in parallel to the container C and the container D, when the container E releases hydrogen and when the container F stores, Va and Vb are closed, and Vc and Vd are closed. Are open, Va and Vb are open when the container E stores hydrogen and the container F releases it. Container E releases hydrogen,
When the container F stores, the container E is connected to the cold water tank 2 and the container F is connected to the cooling tower 3. Container E
Absorbs hydrogen and releases the container F, the container E is connected to the cooling tower 3 and the container F is connected to a cold water tank.

As described above, the exhaust heat recovery side is a moving bed, and the heat generating side is a fixed bed. By combining the characteristics of the moving bed and the fixed layer, excellent characteristics can be obtained. It can be applied to a large-scale factory area, and also to general houses such as an office building on the heat utilization side, and as a result, it is possible to improve overall thermal efficiency and economic efficiency.

[0012]

As described above, according to the present invention, it is possible to improve the overall thermal efficiency and to improve the economic efficiency, thereby achieving industrially excellent effects.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a moving layer / fixed layer connection system in the case of one fixed layer according to the present invention.

FIG. 2 is a schematic view showing a moving layer / fixed layer connection system in the case of two fixed layers according to the present invention.

[Explanation of symbols]

 1 Exhaust heat source 2 Chilled water tank 3 Cooling tower

Claims (2)

[Claims] 1. A hydrogen release reaction vessel is connected in series to a lower part of a hydrogen storage reaction vessel, and an upper part of the hydrogen storage reaction vessel and a lower part of the hydrogen release reaction vessel are connected by a hydrogen storage alloy conveying device. Or a hydrogen release reaction vessel is connected in series to the upper part of the hydrogen storage reaction vessel, and the lower part of the hydrogen storage reaction vessel and the upper part of the hydrogen release reaction vessel are connected by a hydrogen storage alloy transfer device. A hydrogen storage alloy characterized by being connected to a moving bed type hydrogen storage alloy utilization facility for moving the alloy and a fixed bed type hydrogen storage alloy utilization facility in which the reaction vessel serves both for hydrogen absorption and hydrogen release. The mobile / fixed layer connection system to be used. 2. A moving bed type hydrogen storage alloy using one hydrogen storage alloy utilization facility and one or more fixed bed hydrogen storage alloy utilization facilities having a hydrogen storage reaction vessel and a hydrogen release reaction vessel. The equipment continuously converts low-pressure hydrogen to high-pressure hydrogen using heat as the drive source, and uses the high-pressure hydrogen as the drive source to perform the storage operation using the fixed-bed hydrogen storage alloy, and at the same time, uses another fixed-bed hydrogen storage alloy. The equipment is a moving bed / fixed bed connection system using a hydrogen storage alloy, characterized by performing a hydrogen release reaction.