JPH04312465A - Deodorizing device - Google Patents

Abstract

PURPOSE:To prevent the installation place of a deodorizing device from being polluted by the odor component by providing an adsorbent adsorbing the odor component, a catalyst making the odor component released from the adsorbent odorless and harmless, and heating means heating the adsorbent and catalyst respectively. CONSTITUTION:The excitation of a catalyst heater 21 is started to heat and activate a catalyst 20. A catalyst temperature sensor 22 detects that the catalyst 20 is fully heated and activated, the catalyst heater 21 is controlled to maintain the catalyst temperature, and bimetal heaters 10, 11 are excited to close mobile slide plates 5b, 6b after an adsorption fan is stopped. A regeneration pump 4 and an adsorption heater 9 are excited after the mobile slide plates 5b, 6b are closed. Air flows as shown by arrows of solid lines by the action of the regeneration pump 4, and the odor component released from an adsorbent 2 due to the reduction of the adsorption holding quantity by heating is guided to the catalyst 20. The adsorbent 2 is heated to release the odor component.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a deodorizing device used for example in air cleaners and room air conditioners, and in particular,
The present invention relates to a deodorizing device with a regeneration function suitable for regenerating an adsorbent.

0002

[Prior Art] A conventional deodorizing device is
As described in Publication No. 66, an electric heater,
The catalyst was deodorized by ventilation in that order, followed by the activated carbon. In this case, when the electric heater is energized, the catalyst works to decompose the odor, and the activated carbon releases odor components by heating and is regenerated. If the electric heater is not energized,
It deodorized through the adsorption of activated carbon.

0003

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, when the catalyst body is heated and used, the activated carbon is also heated and regenerated at the same time, but in this case, the activated carbon does not directly deodorize the adsorbed odor. Since the odor is released outside the device, the odor will reappear at the installation site of the deodorizing device that has been adsorbed and deodorized.
There was a problem in that even if deodorization was performed using a catalyst, the effect would be small.

[0004] Furthermore, when deodorizing with a catalyst, it is common practice at present to raise the temperature, and if the air volume is increased to obtain a deodorizing effect, the temperature of the discharged gas will also be high, so it is the same as heating. There was a problem that the temperature of the place where it was used rose.

[0005] The object of the present invention is to regenerate an adsorbent such as activated carbon by heating, without contaminating the installation site of the deodorizing device with odor components, and with little effect on the temperature of the installation site. The objective is to provide a deodorizing device with functions.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the deodorizing device of the present invention includes a heating means for heating the adsorbent when odor components in the air are removed through the adsorbent; The present invention is equipped with a catalyst that makes odor components emitted as a result of the heat treatment odorless and harmless, and a heating means that heats the catalyst.

More specifically, the adsorbent and its heating means and the catalyst and its heating means are arranged so as to be thermally isolated from each other, and the heating means for both of them are controlled so that they can be controlled independently. Configure the circuit.

[0008] Also, the adsorbent is located in a plurality of ventilation routes, one of which is equipped with an adsorbent ventilation device and passes odor components in the air to the adsorbent, and the other ventilation route is equipped with an adsorbent ventilation device. , a catalyst ventilation device is provided, which is a path for passing odor components released by heating of the adsorbent to the catalyst, and a ventilation switching means is provided for switching between these two ventilation paths.

That is, the technical means of the present invention comprises an adsorbent that adsorbs odor components, a catalyst that renders the odor components released by the adsorbent odorless and harmless, and heating means that heats the adsorbent and the catalyst, respectively. The adsorbent is normally installed and controlled independently, and the adsorbent is normally ventilated at room temperature to adsorb odor components, and during regeneration, the temperature of the adsorbent is raised to release the odor components, which are then ventilated and
Using a catalyst ventilation system with a much smaller volume of air than the adsorbent ventilation system that performs adsorption operation, the air is forcibly guided to the heated and activated catalyst, making it odorless and harmless.

0010

[Operation] The operation of the above technical means is as follows.

[0011] The adsorbent adsorbs various odor components at room temperature, and by passing air through the adsorbent, the odor components in the ventilated air are adsorbed and removed.

Next, when regenerating the adsorbent, the adsorbent is heated. As a result, the amount of adsorption and retention of the adsorbent decreases, and the adsorbed odor components are released into the air.

[0013] A ventilation device is used to forcibly ventilate the catalyst that renders the odor components odorless and harmless. In this case, ventilation does not target the air in the entire room as in deodorizing operation, but air is used as a carrier to carry the odor components released by the adsorbent to the catalyst, so the air volume is much larger than that in deodorizing operation. A small air volume is sufficient. As a result, the odor components of the adsorbent are removed, and the adsorbent is made odorless and harmless by the catalyst, and can be regenerated. By independently controlling the temperatures of the adsorbent and the catalyst, it is possible to efficiently release odor components from the adsorbent and to make the adsorbent odorless and harmless.

[0014]

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to FIGS. 1 to 6.

FIG. 1 is a sectional view of the deodorizing device of the present invention.
In the figure, 1 is the deodorizing device main body, 2 is the adsorbent, 3 is the adsorption fan that constitutes the adsorbent ventilation device, 4 is the catalyst storage section, 5a is the suction side fixed slide plate, 5b is the suction side fixed slide plate, and 6a is the suction side fixed slide plate. A fixed slide plate on the discharge side, 6b a movable slide plate on the discharge side, 7 a bimetal on the suction side, 8 a bimetal on the discharge side, 9 an adsorbent heater, 10 a bimetal heater on the suction side, 11 a bimetal heater on the discharge side, and 12 a pre-filter. , 13 is a discharge port, 14 is a wind direction plate, and 15 is an adsorbent temperature sensor.

Further, in FIG. 2, 20 is a catalyst that makes odor components odorless and harmless, 21 is a catalyst heater, 22 is a catalyst temperature sensor, 23 is a regeneration pump constituting a catalyst ventilation device, and 2
4 is a heat insulating material.

The adsorbent 2 includes well-known activated carbon, zeolite,
Single or composite materials such as silica gel, porous ceramics, or metal oxides such as titanium oxide, zinc oxide, manganese oxide, and copper oxide are used, and their shapes are honeycomb, sponge, granules, fibers, etc. Any shape that allows for a large contact area will suffice.

Although the adsorbent heater 9 and the catalyst heater 21 are sheath-type heaters in this embodiment, they may also be of a structure that can heat the adsorbent 2 and the catalyst 20 almost uniformly, such as a honeycomb heater or a rod-shaped heater. Good to have. Also,
It is not limited to electric type, and heat such as combustion or solar heat may be used. The bimetal heaters 10 and 11 can be chip-shaped heaters, sheath heaters, ribbon heaters, or the like.

When targeting acetaldehyde gas, which is said to be the main component of tobacco odor, etc. as an odor component, catalyst 20
Preferably, cobalt oxide impregnated alumina is used. Further, its shape can take various shapes like the adsorbent 2, but for example, in the case of a honeycomb shape, a honeycomb of alumina, preferably γ-alumina, is mixed with cobalt nitrate [Co(NO3)2]. Cobalt nitrate is attached to the alumina honeycomb by immersing it in an aqueous solution of
It is obtained by thermally decomposing and oxidizing cobalt nitrate at a temperature of 200°C or higher. The relationship between the acetaldehyde decomposition performance and temperature of this catalyst 20 is good as shown in FIG.
It exhibits a high decomposition rate above about 50°C.

FIG. 4 is a time chart of the operation of each component during operation of the deodorizing device, where the horizontal axis represents the passage of time, and the shaded area represents switch-on. The period from a to c is a deodorizing operation, in which the adsorbent 2 is ventilated by the adsorption fan 3. After the air containing odor components passes through the pre-filter 12 shown in FIG. 1 to remove dust, etc., it is guided by an adsorbent to be adsorbed and deodorized, and then to the discharge port 1.
3, the direction of the wind is controlled by the wind direction plate 14, and the wind is discharged outside the device.

At point b, energization of the catalyst heater 21 is started,
The catalyst 20 is heated and activated between points b and c. This b
Between and c, the deodorizing operation by turning on the adsorption fan 3 and the heating of the catalyst 20 by the catalyst heater 21 are performed at the same time, but the catalyst 20 and the adsorbent 2 are installed in a position where they are unlikely to be affected thermally. In addition, since it is thermally insulated by the heat insulating agent 24, it is thermally isolated without any problems, and the stop time of the deodorizing operation due to regeneration can be shortened.

At point c in FIG. 4, the catalyst temperature sensor 22 detects that the catalyst 20 has been sufficiently heated and activated, and after controlling to maintain this temperature and stopping the adsorption fan 3, the temperature changes as shown in FIG. The bimetal heaters 10 and 11 are energized so as to close the movable slide plates 5b and 6b. movable slide plate 5b,
To explain the movement of the suction side bimetal 6b using the suction side as an example, in FIG. , a little play is provided to accommodate the expansion, contraction, and curvature of the suction side bimetal 7. Suction side bimetal 7
However, when heated by the suction side bimetal heater 10, the center portion curves to move downward. By attaching the suction side movable slide plate 5b near the center of the suction side bimetal 7, the suction side movable slide plate 5b can be slid to close the suction side passage. The passage can be closed on the discharge side by a similar operation.

[0023] The movable slide plates 5b and 6b are made of fluorine resin or are made of metal plates coated with fluorine resin to reduce friction and smooth movement.

d after the movable slide plates 5b and 6b are closed
At this point, the regeneration pump 4 and the adsorbent heater 9 are energized. The operation of the regeneration pump 4 causes air to flow as indicated by the solid arrow in FIG. 2, leading to the catalyst 20 the odor components released by the adsorbent 2 due to a decrease in the amount of adsorption and retention due to heating. The adsorbent 2 is heated between d and e in FIG. 4 to release odor components. In this way, the odor components are released from the adsorbent 2 after the catalyst 20 is completely heated and activated, so that the odor can be made odorless and harmless at all times with high efficiency. Note that the exhaust gas discharged from the regeneration pump 4 has a temperature higher than room temperature, but the flow rate of the air from the regeneration pump is sufficient to carry the odor components released by the adsorbent 2, so that it acts as a carrier, so the flow rate is small. Well,
The heat of the exhaust gas has very little effect on the temperature of the place where the deodorizing device is used.

FIG. 3 shows the decomposition performance of the catalyst 20 for acetaldehyde gas. This decomposition rate was determined by keeping the catalyst 20 at a constant test temperature, passing the acetaldehyde gas through it, and measuring the acetaldehyde concentration before and after passing through the catalyst 20 using a gas chromatograph. This was determined by quantitative analysis using a flame ionization detector.Since the gas after passing through the catalyst 20 shows almost no other peaks other than the small amount of acetaldehyde remaining, the generated gas was detected using a flame ionization detector. It is assumed that the undetectable components of carbon dioxide and water are oxidized as follows.

2CH3CHO+5O2→4CO2+4H
If the 2O decomposition products are carbon dioxide gas and water, there will be no odor and no problem even if they are discharged outside the apparatus. In addition to cobalt, the active component of the catalyst 20 may contain, for example, at least one selected from platinum, palladium, silver, copper, manganese, iron, and nickel.

[0027] Release of odor components from the adsorbent 2 is reduced,
The point at which the regeneration ends is point e shown in FIG. The regeneration pump 23 continues to operate during ef to cool the adsorbent 2, waits for the bimetals 7 and 8 to also cool, and waits for the bimetals 7 and 8 to return to their displacement and the movable slide plates 5b and 6b to open. wait. In addition, bimetal 7
, 8 may be provided with a return spring 30 as shown in FIG.

In FIG. 4, point f is the point at which the adsorbent 2 cools and recovers its adsorption force, and the movable slide plates 5b and 6b open to enable deodorizing operation, and the adsorption fan 3 is activated. It becomes possible to perform deodorizing operation.

FIG. 6 is a control circuit diagram showing a method of controlling the deodorizing device. In the figure, 40 is a power supply, 41 is a control microcomputer, and when the operation switch 42 of the suction fan 3 is pressed, a command is transmitted to the suction fan 3. Note that it is preferable to provide a changeover switch 43 so that the operation switch 42 can change the strength of the rotation speed of the suction fan 3. Reference numeral 44 denotes a deodorization indicator lamp, which lights up when the suction fan 3 is operating to indicate adsorption and deodorization. Regeneration is performed by measuring whether the adsorbent 2 has been used for a certain period of time by the control microcomputer 41, or by pressing the forced regeneration switch 45. In this case, the deodorizing indicator lamp 44 remains lit until the suction fan 3 stops, and the regeneration indicator lamp 44 remains lit until the suction fan 3 stops.
6 turns on the catalyst heater switch 47 to turn on the catalyst heater 21.
It starts blinking as soon as the power is turned on. The temperatures of the catalyst 20 and the catalyst heater 21 are detected and controlled by a catalyst temperature sensor 22. When the catalyst temperature sensor 22 detects that the catalyst 20 has been heated to the activation temperature, the adsorption fan 3 is stopped, the deodorizing indicator lamp 44 is turned off, and the bimetal heater switch 48 is turned on to turn on the bimetal heater. 10 and 11 are energized and heated. When the bimetals 7 and 8 are sufficiently heated and the movable slide plates 5b and 6b are closed, turn on the adsorbent heater switch 49 and turn on the adsorbent heater 9.
At the same time, the regeneration pump switch 50 is also turned on, and the regeneration pump 23 is also energized. The regeneration indicator lamp 46 changes from blinking to lighting, and the temperatures of the adsorbent 2 and the adsorbent heater 9 are detected and controlled by the adsorbent temperature sensor 15. After a certain period of time has elapsed, the bimetal heater switch 48 and the adsorbent heater switch 49 are turned off, and when the adsorbent temperature sensor 15 detects that the temperature of the adsorbent 2 has decreased, the catalyst heater switch 47 and the regeneration pump switch 50 are turned off. , the playback indicator lamp also turns off.

Next, the operation returns to the initial deodorizing operation, the suction fan 3 is energized, and the deodorizing indicator lamp 46 is turned on. Although the temperature of the bimetals 7 and 8 was not particularly measured, the adsorbent heater 9 was turned off at the same time as the bimetal heaters 10 and 11 were turned off to allow time for the adsorbent 2 to cool down. Even if the bimetals 7 and 8 are not completely cooled, there is no problem because they are rapidly cooled by operating the suction fan 3.

Furthermore, as a safety device, a temperature fuse 51 and a circuit current fuse 52 are provided to prevent overheating of the catalyst heater 21, adsorbent heater 9, and bimetal heaters 10 and 11.

According to this embodiment, it is possible to realize a deodorizing device that can maintain good deodorizing performance over a long period of time,
Further, even when the adsorbent is regenerated, the odor components released by the adsorbent can be made odorless and harmless at all times with high efficiency, so that safe and efficient deodorization can be performed. Furthermore, the temperature of the place where the deodorizing device is used is less likely to be affected.

[0033]

[Effects of the Invention] According to the present invention, when an adsorbent such as activated carbon is heated and regenerated, the installation location of the deodorizing device is not contaminated with odor components, and the temperature of the installation location is not affected. A deodorizing device with a small regeneration function can be provided. Therefore, it is possible to realize a deodorizing device that can maintain good deodorizing performance over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a deodorizing device according to an embodiment of the present invention;

[Fig. 2] A vertical cross-sectional view showing the regeneration operation state of the deodorizing device.

[Figure 3]
Acetaldehyde decomposition performance of a catalyst used in a deodorizing device - temperature relationship diagram,

FIG. 4 is a time chart showing the operation of each component of the deodorizing device;

[Fig. 5] An explanatory diagram of the operation of the suction side movable slide plate,

[Figure 6]
The control circuit diagram showing the control method of the deodorizing device.

[Explanation of symbols]

2... Adsorbent, 3... Adsorption fan, 5b... Suction side movable slide plate, 6b... Discharge side movable slide plate, 7... Suction side bimetal, 8... Discharge side bimetal, 9... Adsorbent heater, 20
...catalyst, 21...catalyst heater, 23...regeneration pump.

Claims (5)

[Claims] 1. A deodorizing device that removes odor components from the air through an adsorbent, comprising: a first heating means for heating the adsorbent; and a deodorizing device that removes odor components released by heating the adsorbent. and a second heating means for heating the catalyst, wherein the adsorbent is located in two ventilation paths, one of the ventilation paths being equipped with an adsorbent ventilation device to eliminate odor components in the air. The other ventilation path is equipped with a catalyst ventilation device and is a path through which the odor components released by heating the adsorbent are passed through the catalyst, and the two ventilation paths are A deodorizing device characterized in that, as a ventilation switching means for switching, the position of the hole is moved by sliding two plates with holes in the same location, thereby opening and closing the path of the adsorbent ventilation device. 2. In claim 1, the two plates having holes formed at the same location as the ventilation switching means are made of fluorine resin or a metal plate coated with fluorine resin, and the plates are slidable. As a power source, heating and cooling of bimetal or shape memory alloy, or electromagnetic force,
A deodorizing device that uses air pressure. 3. According to claim 1, the adsorbent is activated carbon,
Deodorizing equipment made of zeolite, silica gel, porous ceramics, or porous metal oxides or their composites. 4. The deodorizing device according to claim 1, wherein the adsorbent is activated carbon formed in a honeycomb shape, sponge shape, granule shape, or fiber shape, and the active component of the catalyst that makes odor components odorless and harmless is cobalt. . 5. In claim 1, the adsorbent and the first heating means, the catalyst and the second heating means are arranged to be thermally isolated from each other, and the first heating means is arranged so as to be thermally isolated from each other. A deodorizing device comprising a control circuit so that the heating means and the second heating means can be independently controlled.