JPH1015338A - Deodorizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deodorizing device which is capable of effectively using thermal energy which air for regeneration and cooling air have, and dispensing with a heat exchanger and thereby saving on equipment cost and further, can be installed even in a small space. SOLUTION: A honeycomb-shape rotor 1 is driven to rotate around its center shaft and the rotary passage area of the rotor 1 is divided, at least, into a treatment zone 1a, a regeneration zone 1b and a cooling zone 1c in that order. Further, the treatment zone malodorous components and the cooling zone 1c cools the rotor 1 and at the regeneration zone 1b the malodorous components desorbed from rotor 1 enter a circulating path. The malodorous components are catalytically decomposed ion a catalytic tank 5 located in the circulating path and disappears.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing apparatus for removing malodorous components from treated air, and more particularly to a device for removing malodorous components in treated air by adsorbing a rotor and regenerating the rotor with heated air for regeneration. The present invention relates to a deodorizing apparatus for desorbing the malodorous component from the rotor by using the catalyst, and thereafter decomposing and removing the malodorous component in the heated air for regeneration with a catalyst.

[0002]

2. Description of the Related Art For example, a paint used in a coating plant contains an organic solvent. In the coating step and the drying step, the organic solvent is volatilized to generate a strong pungent odor, and this organic solvent gas is emitted. Adversely affect the human body. Therefore, various deodorizing treatments are performed in factories using these organic solvents.

[0003] Among the conventional deodorizing apparatuses for performing these deodorizing treatments, there is a catalytic combustion type deodorizing apparatus that decomposes and removes malodorous components with a catalyst. In this deodorizing apparatus, in order to reduce the running cost in the catalytic combustion process, the air to be treated (gas to be treated) containing a malodorous component is passed through the catalyst tank before the air to be treated is honeycomb-shaped. After concentration using a rotor, the odorous components are decomposed and removed by a catalytic combustion method.

FIG. 2 is a block diagram showing this conventional deodorizing device. The suction rotor 51 in which the adsorbent is formed into a honeycomb-shaped rotor is continuously rotated around the suction rotor 51, and the rotation passage area of the suction rotor 51 is divided into a suction processing zone 51a and a regeneration zone 51b. When the adsorption processing zone 51a is rotating, the air to be processed (the gas to be processed) is passed through the adsorption rotor 51 by the blower 52 so that the malodorous components in the air to be processed are adsorbed by the adsorption rotor 51, and the deodorized cleaning is performed. Air is discharged from the adsorption rotor 51.

On the other hand, in the regeneration zone 51b, high-temperature (about 120 ° C.) regeneration air heated by the heater 53 is passed through the adsorption rotor 51 at a flow rate smaller than the processing flow rate.
The malodorous substance adsorbed on the adsorption rotor 51 is removed by the adsorption rotor 5.
Detach from 1 The regeneration air after regeneration of the adsorption rotor contains a high concentration of malodorous components. After passing through the heat exchanger 54, the regeneration air is heated by the heater 55 and introduced into the catalyst tank 56. The catalyst tank 56 is filled with an oxidation catalyst. After the regeneration at a high temperature (about 300 ° C.) heated by the heater 55, the malodorous components in the air cause a decomposition reaction in the catalyst tank 56 by the action of the catalyst. Because this decomposition reaction is exothermic,
The purified air (clean gas) exiting the catalyst tank 56 is about 3
The temperature of the purified air, which has risen to 30 ° C., is exchanged with the purified air that has flowed out of the catalyst tank 56 in the heat exchanger 54, and the retained heat is given to the air after regeneration of the adsorption rotor passing through the catalyst tank 56. Later, it is discharged.

As described above, in the deodorizing apparatus provided with the adsorption rotor 51, after the air to be treated (gas to be treated) is concentrated by the adsorption rotor 51, the air containing the malodorous component after the regeneration of the adsorption rotor is introduced into the catalyst tank 56. Then, the odorous substances are decomposed and removed, and the air volume of the air containing the odorous components to be introduced into the catalyst tank 56 can be reduced as compared with the case where the air to be treated is directly introduced into the catalyst tank 56. That is, the amount of air to be decomposed in the catalyst tank 56 to be catalytically decomposed can be reduced. For this reason, this deodorizing device can reduce the heating energy required for catalytic combustion as compared with the case where the air to be treated is directly introduced into the catalyst tank.

Here, the temperature of the air introduced into the catalyst tank 56 after regeneration of the adsorption rotor is about 300
C. or higher. However, in the above-mentioned conventional deodorizing apparatus, high-temperature clean air (about 3
30 ° C.) through a heat exchanger 54 to transfer the retained heat to the catalyst tank 5.
It is used for heating the air after regeneration of the adsorption rotor introduced into 6.

[0008]

However, in the conventional deodorizing apparatus, the heater 53 used for heating the regeneration air supplied to the regeneration zone 51b, and the heating of the air after regeneration of the adsorption rotor introduced into the catalyst tank 56 are performed. Heater 5 used for
5 and two heaters are required. In this conventional apparatus, the exhaust heat of the combustion catalyst device (catalyst tank 56) is used by the heat exchanger 54. However, since the heat exchange by the heat exchanger 54 is performed between gases, the heat exchange rate is low. bad. Therefore, in order to sufficiently utilize the heat retained in the clean air from the catalyst tank 56, it is necessary to increase the size of the heat exchanger 54 to increase the heat transfer area. However, even if the heat transfer area is increased, the heat exchange efficiency is at most 50 to 60%, and the remaining heat is discarded outside as a high-temperature gas. For this reason, the conventional deodorizing device has a problem that the running cost is high because the heat held by the purified air after the catalytic combustion cannot be effectively used.

In addition, since this conventional apparatus uses a heat exchanger, there are disadvantages that the apparatus cost is high and the installation space must be large.

The present invention has been made in view of the above-mentioned problems, and can effectively utilize the heat energy of the regeneration air and the cooling air, and can omit a heat exchanger to reduce the cost of the apparatus. An object of the present invention is to provide a deodorizing device which can be installed in a small space with a reduced size.

[0011]

According to the present invention, there is provided a deodorizing apparatus comprising a honeycomb-shaped rotor made of an adsorbent for malodorous components, a driving means for rotating the rotor about its central axis, and a rotation of the rotor. Dividing means for dividing the passage area into at least a processing zone, a regeneration zone, and a cooling zone in this order; processing air introducing means for passing processing air to the rotor in the processing zone; and the cooling zone using the processing air as cooling air. Means for introducing cooling air into the
Regeneration heating air supply means for circulating and supplying regeneration heating air to the regeneration zone; replenishment means for introducing air after passing through the cooling zone into a circulation path of the regeneration heating air; and replenishment means in the circulation path A heating means disposed between the connecting position of the rotor and the rotor for heating the regeneration air, and a catalyst disposed between the heating means and the rotor for storing a catalyst for decomposing the deodorizing component. A tank, extraction means for extracting regeneration heating air from a first position downstream of the catalyst tank in the circulation path, and a second position upstream of the catalyst tank and downstream of the first position in the circulation path. And a bypass means connecting between the third position on the side.

[0012] The adsorbent may be composed mainly of hydrophobic zeolite. The catalyst may be at least one oxidation catalyst selected from the group consisting of iron, manganese, copper, zinc and nickel, or at least one oxidation catalyst selected from the group consisting of platinum, palladium, gold, rhodium and silver. And a noble metal catalyst consisting of

[0013] Further, the rotor may be a mixture of a catalyst and, for example, a molded article of platinum mixed with hydrophobic zeolite or a mixture of platinum mixed with hydrophobic zeolite may be used as a honeycomb substrate. Some are impregnated.

In the present invention, when the honeycomb-shaped rotor rotates, the malodor component in the processing air is adsorbed in the processing zone, and the malodor component is removed from the processing air. Thereafter, the rotor receives the flow of heated air for regeneration in the regeneration zone and is heated to desorb odorous components. Next, the rotor is cooled by receiving the flow of the processing air in the cooling zone, and the adsorption efficiency is restored.

[0015] The malodorous component desorbed from the rotor enters the circulation path of the heated air for regeneration, and is decomposed and disappeared by the catalyst in the catalyst tank disposed in the circulation path. Then, a part of the regeneration air after the malodorous component is decomposed by the catalyst is extracted from the circulation path, and a substantially equal amount of the extracted gas after cooling is introduced into the circulation path. Further, a heating means for heating the regeneration air is provided in the circulation path.
The air for regeneration is heated to a certain degree, and the temperature of the regeneration air itself rises due to a catalytic reaction, which is an exothermic reaction, and further rises to a higher temperature. But,
Thereafter, the regeneration air before heating supplied by the bypass means is mixed with the regeneration air, and is cooled to a temperature not lower than the temperature required for regeneration of the rotor (for example, about 190 ° C.). The regeneration air temperature-controlled in this way passes through the regeneration zone. As a result, the offensive odor component adsorbed on the rotor is desorbed and enters the circulation path.
Then, the regeneration air in which the malodorous component is concentrated is heated by the heating means, then passes through the catalyst tank, where the malodorous component is decomposed by the catalyst, and the malodorous component disappears.

As described above, the regeneration air from which the offensive odor component has been removed is extracted from the circulation path. On the other hand, the rotor after regeneration receives the passage of the processing air in the cooling zone, the rotor is cooled by the processing air, and the adsorption efficiency is restored. The processing air after rotor cooling is introduced into the circulation path. Therefore, the processing air of the air volume required for cooling the rotor is supplied to the cooling zone of the rotor, and the cooled processing air is supplied to the circulation path. Then, an amount of regeneration air equal to that of the processing air introduced into the circulation path is extracted from the circulation path after passing through the catalyst. For this reason, the adsorption efficiency of the rotor can be controlled to an optimum value.

Further, by the bypass means, a part of the regeneration air passes directly from the second position on the upstream side of the catalyst tank to the third position on the downstream side of the first position for extracting the regeneration air, and is supplied to the heating means. Not heated by For this reason, the temperature of the heating air for regeneration can be adjusted by adjusting the amount of air to be bypassed by the bypass means. If the temperature of the regeneration air supplied to the regeneration zone of the rotor 1 is adjusted to the minimum temperature required for deodorizing the odorous component, the amount of heat required to heat the regeneration air by the heater is minimized. The rotor can be prevented from being unnecessarily heated, and the heat energy can be effectively used.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be specifically described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a deodorizing device according to an embodiment of the present invention. The deodorizing rotor 1 has a cylindrical shape, is rotatably supported around its central axis, and is driven to rotate in one direction by a suitable driving means. The rotor 1 is divided into three zones: a processing zone 1a, a regeneration zone 1b, and a cooling zone 1c. The center angle of each zone is, for example, 225 ° for the processing zone 1a and 90 ° for the reproduction zone 1b.
°, and the cooling zone 1c is 45 °.

The deodorizing rotor 1 is formed of a hydrophobic zeolite which is an adsorbent for malodorous components. However, it is also possible to use a mixture in which the hydrophobic zeolite and the catalyst are mixed and the mixture is formed into a honeycomb shape, and a mixture in which the mixture is supported on a honeycomb ceramic substrate.

As the catalyst, a noble metal such as platinum, palladium, gold, rhodium or silver can be used, and an oxidation catalyst such as iron, manganese, copper, zinc or nickel can also be used.

The air to be deodorized is introduced into the processing zone 1a of the rotor 1 through the pipe 7 after the dust is removed by the filter 2. This processing air is sent into the rotor 1 by the blower 3 provided in the pipe 7. The air that has exited the processing zone 1a is discharged to the outside via the pipe 8.

A pipe 10 (circulation path) is provided in the regeneration zone 1b.
The regeneration air is circulated and supplied via the. The pipe 10 has a blower 4 for sending out regeneration air, a heater 6 such as a burner for heating the regeneration air, and a catalyst tank 5 for storing a catalyst for decomposing malodorous components in the regeneration air by a catalytic reaction. Are arranged in this order in the flow direction of the regeneration air. Then, the regeneration air, in which the offensive odor component is decomposed and purified by the catalyst, is supplied to the regeneration zone 1b of the rotor 1. The post-regeneration air exiting the regeneration zone 1b is returned to the catalyst tank 5 by the blower 4 via the pipe 10.

A part of the regeneration air that has been cleaned out of the catalyst tank 5 is supplied to the pipe 8 via the pipe 12 and exits the processing zone 1a of the rotor 1 and is cleaned together with the processed air. Discharged as clean air. On the other hand, part of the regeneration air exiting the blower 4 is
At the upstream side of the rotor 1. The regeneration air passing through the bypass pipe 11 escapes from a position (second position) immediately after the blower 4 in the pipe 10 and is introduced into a position immediately before the rotor 1 (third position). And the pipe 10
The regeneration air extracted from the (circulation path) is supplied to the pipe 8 from a position downstream of the catalyst tank 5 in the pipe 10 and upstream of the third position (first position).

On the other hand, a part of the processing air flowing through the pipe 7 is introduced into the cooling zone 1c of the rotor 1 by the pipe 7a branched from the pipe 7. The cooled air that has passed through the cooling zone 1c is supplied to a position upstream of the blower 4 in the pipe 10 (circulation path).

The processing zone 1a, the regeneration zone 1b and the cooling zone 1b are provided on the surface of the rotor 1 on the outlet side of the processing air.
Three chambers (not shown) that partition each zone are provided, and pipes 8, 10, and 9 are connected to each of these chambers. On the other hand, on the surface of the rotor 1 on the processing air inlet side, two chambers (not shown) are provided corresponding to the regeneration zone 1b, the processing zone 1a and the cooling zone 1c, respectively, and partition the two zones. I have. As is apparent from the above description, the branch pipe 7a is provided for convenience of description in FIG. 1, and in actuality, connects the pipe 7 to a chamber including both the processing zone 1a and the cooling zone 1c of the rotor 1. It is sufficient to supply the processing air to the processing zone 1a and the cooling zone 1c of the rotor 1. That is, it is only necessary to connect the pipe 7 as it is to the chamber including the processing zone 1a and the cooling zone 1c of the rotor 1 without specially providing the pipe 7a branched from the pipe 7.

Next, the operation of the deodorizing device configured as described above will be described. The treated air containing odorous gas is
The odor component is sent to the processing zone 1a of the deodorizing rotor 1, and the offensive odor component is adsorbed and removed by the adsorbent portion of the rotor 1 made of hydrophobic zeolite. The air after passing through the processing zone is discharged from the pipe 8 as purified air.

Then, the rotor 1 having absorbed the malodorous component rotates to the regeneration zone 1b. Then, in the regeneration zone 1b, the rotor 1 is heated by receiving the flow of the high-temperature air heated by the regeneration heater 6, and the malodorous component adsorbed on the rotor 1 is desorbed from the rotor 1. The regenerated air containing the malodorous component desorbed from the rotor 1 at a high concentration is decomposed by the catalyst in the catalyst tank 5.

In this way, the air after the odorous components are oxidatively decomposed is partly extracted and discharged to the pipe 8 through the pipe 12, and the air extracted from the pipe 10 has substantially the same amount of air as the air. From the cooling zone 1c via the pipe 9
Will be replenished. Further, the regeneration air is circulated and supplied to the regeneration zone 1b of the rotor 1 via the pipe 10, but a part of the air is not passed through the bypass pipe 11 without being heated by the heater 6 and catalyzed by the catalyst tank 5. Circulate. Therefore, by adjusting the amount of the regeneration air to be bypassed, the temperature of the regeneration air supplied to the regeneration zone 1b of the rotor 1 can be adjusted. In this way, the regeneration conditions are controlled and the thermal energy of the regeneration air is effectively used.

Further, in the present embodiment, the cooled air is not discharged to the outside air as it is or returned to the processing inlet air, and the cooled air is supplied to the pipe 1 of the circulation regeneration air path.
0 to recover the heat from the cooled air to which the heat of the rotor is transferred into the regeneration air.

As described above, according to the present embodiment, the gas containing the malodorous component can be deodorized with high efficiency.

Further, if a catalyst is mixed with the rotor 1 in addition to the adsorbent, the adsorbed components can be collected in the regeneration zone 1b even when deodorizing a gas containing aromatic hydrocarbons such as toluene, xylene and phenol. Since it is decomposed by the catalyst, it does not remain in the rotor due to thermal polymerization,
The rotor life is not shortened. In addition, regardless of the form in which the catalyst is added to the adsorbent, the catalyst is constituted by a honeycomb-shaped rotor, so that its specific surface area is large and a substance having a strong odor can be sufficiently deodorized.

Further, the deodorizing treatment is performed only by the rotor 1 and the heat exchanger is not required, so that the equipment cost does not increase and the apparatus does not increase in size, so that the running cost is low. .

[0033]

As described above, according to the present invention,
In addition to circulating and supplying regeneration air to the regeneration zone, a catalyst tank is provided in the middle of this circulation path to decompose and eliminate odorous components in the regeneration air, so always supply purified air to the regeneration zone. To regenerate the rotor. In addition, a bypass pipe is provided in the circulation path to mix the low-temperature regeneration air before heating by the heating unit with the high-temperature regeneration air after heating by the heating unit, so that the air is supplied to the regeneration zone of the rotor. The temperature of the regeneration air can be adjusted to the minimum temperature required for desorption of the adsorbed component, so that the rotor is not heated unnecessarily and the amount of heat generated by the heater can be reduced. For this reason, thermal energy can be used effectively and running costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a deodorizing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional deodorizing device.

[Explanation of symbols]

 1; rotor 1a; processing zone 1b; regeneration zone 1c; cooling zone 2; filters 3, 4; blower 5; catalyst tank 6; heaters 7, 7a, 8, 9, 10, 11, 12;

Continued on the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location B01D 53/74 B01D 53/34 116H 53/86 53/36 H B01J 20/18

Claims (6)

[Claims] 1. A honeycomb-shaped rotor made of an adsorbent for malodorous components, driving means for driving the rotor to rotate around its central axis, and a rotation passage area of the rotor at least in a processing zone, a regeneration zone, and a cooling zone. Dividing means for dividing the processing air in this order, processing air introducing means for passing processing air through the rotor in the processing zone, cooling air introducing means for introducing the processing air into the cooling zone as cooling air, and the regeneration zone Heating air supply means for circulating the heating air for regeneration, supply means for introducing the air after passing through the cooling zone into the circulation path of the heating air for regeneration, and connection positions of the supply means in the circulation path Heating means disposed between the heating means and the rotor for heating the regeneration air; and a deodorizing component disposed between the heating means and the rotor. A catalyst tank storing a catalyst for decomposing the catalyst, extracting means for extracting regeneration heating air from a first position downstream of the catalyst tank in the circulation path, and a second upstream section of the catalyst tank in the circulation path. Position and the first
A deodorizing device, comprising: a bypass unit for connecting a third position downstream of the position. 2. The deodorizing apparatus according to claim 1, wherein the adsorbent is mainly composed of a hydrophobic zeolite. 3. The catalyst according to claim 1, wherein the catalyst is an oxidation catalyst comprising at least one selected from the group consisting of iron, manganese, copper, zinc and nickel.
The deodorizing device according to 1. 4. The deodorizing apparatus according to claim 1, wherein the catalyst is a noble metal catalyst made of at least one selected from the group consisting of platinum, palladium, gold, rhodium, and silver. 5. The deodorizing apparatus according to claim 1, wherein a catalyst is mixed in the rotor. 6. The honeycomb structure according to claim 5, wherein the rotor is formed by impregnating a honeycomb substrate with a molded product obtained by mixing platinum with hydrophobic zeolite or a product obtained by mixing platinum with hydrophobic zeolite. Deodorizing device.