JPS5937591Y2 - Exhaust heat recovery device - Google Patents

Description

[Detailed description of the invention] This invention relates to an exhaust heat recovery device that recovers exhaust heat from ventilation or combustion equipment, etc. The purpose of the invention is to absorb heat from metal hydrides when they release hydrogen. The present invention provides a new exhaust heat recovery device that utilizes this phenomenon and the heat generation phenomenon when absorbing hydrogen.

To explain the configuration of the present invention using figures, Fig. 1 is a sectional view of an exhaust heat recovery device showing one embodiment of the present invention, Fig. 2 is a front view thereof, and Fig. 3 is a It is a principle diagram of operation showing heat absorption, heat generation, etc. from an object.

In FIG. 1, 1 indicates 1 on both sides of the center. It is a sealed pipe in which metal hydride is sealed in and 1b and has an on-off valve 6 in the center, and fins 2 are attached to both sides 1a and 1b to improve heat exchange with the air. A heat exchange section 313b that performs heat exchange is formed.

Opposed to the heat exchange parts 3 and 3b on both sides, blowers 414b whose blowing directions can be reversed are arranged so that the blowing directions are opposite to each other as shown by arrows X and Y, and these blowers 4a and 4
It has a structure in which a closed container 1 containing metal hydride and metal hydride is housed in a frame 5.

Note that 1 in the figure is a wall that partitions an indoor side 8 and an outdoor side 9.

Next, the operation and effects of this embodiment will be explained using FIGS. 1 and 3.

Now, if we consider the case where a metal hydride having the characteristics as shown in the M line in Fig. 3 is sealed on both sides 1 and 11b of the sealed pipe 1 to recover exhaust heat from house ventilation in winter, arrows X and Y As shown in the heat exchange section 31, indoor contaminated air at 20° C. is discharged, and the heat exchange section 3. Now, if fresh outside air at 0°C is introduced, the metal hydride compound on one side 1a of the sealed pipe 1 is shown at point A in Figure 3, and the metal hydride compound on the other side 1b is shown at point B. shown.

If the on-off valve 6 is opened at this time, a phenomenon occurs in which it receives heat at point A and releases hydrogen, and absorbs hydrogen at point B and generates heat.

That is, one side 1. The heat of the indoor contaminated air passing through the other side 1. It will be collected into fresh outside air.

In this case, - side 1. There is a limit to the amount of hydrogen in the metal hydride sealed in the metal hydride, so if the hydrogen is released, the hydrogen will run out, so in this case, close the on-off valve 6 and close each blower 4. *Reverse 4b and change the air blowing direction as shown by the dotted arrow.

If you do this, the indoor contaminated air will pass through the other side 1b and the outside air will pass through the one side 1a.
At b, the state is at point A, and at - side 1a, the state is at point B.

At this time, when the on-off valve 5 is opened again, hydrogen is released by heating on the other side 1, and the negative side 1J! Then, it will absorb hydrogen and generate heat.

Therefore, this time, the heat of the indoor contaminated air passing through the other side 1b is
It will be collected by outdoor air passing through the − side 11.

In this state, when the amount of hydrogen released on the other side 1b decreases again, the on-off valve 6 may be closed again and each blower 4as4b may be reversed again.

By linking the opening and closing of the on-off valve 6 and the reversal of the blower 414b as described above, continuous recovery of exhaust heat becomes possible.

As is clear from the description of the embodiments above, the present invention is a new waste heat recovery device that utilizes the endothermic phenomenon when releasing hydrogen from metal hydrides and the exothermic phenomenon when absorbing hydrogen. When the hydrogen in the metal hydride in the sealed piping on both sides of the valve has completed moving to either side, the on-off valve is closed and each blower is reversed, and then the pressure difference in the sealed piping on both sides of the on-off valve is closed. By opening the on-off valve when this occurs, continuous exhaust heat recovery operation can be continued.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an exhaust heat recovery device according to an embodiment of the present invention, FIG. 2 is a front view of the same exhaust heat recovery device, and FIG. 3 is a principle diagram showing the state of metal hydride. 1... airtight container, 2... heat transfer fins,
313b... Heat exchange section, 4a, 4.・・・・・・
・Blower, 5...Frame, 6...Open/close valve.

Claims (1)

[Scope of utility model registration request] A metal hydride is sealed on both sides of a sealed pipe with an on-off valve in the center, and blowers with different blowing directions are disposed to face the metal hydride-filled portions on both sides, and the air-tight valve is sealed on both sides of the on-off valve. When the hydrogen in the metal hydride in the pipe has completed moving to either side, the on-off valve is closed and each of the blowers is reversed, and then the pressure difference in the sealed pipe on both sides of the on-off valve is An exhaust heat recovery device configured to open the on-off valve when a heat generation occurs.