JP2003180806A - Semi-wet air treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a semi-wet air treatment apparatus which dispenses with pumping and circulation of treatment liquid (liquid chemicals) thereby does not require driving power, is simple and can be used for a long period and whose treatment efficiency is improved by obtaining a large contact area by using a honeycomb filter. <P>SOLUTION: A treatment liquid tank 1 is provided with an inlet 1a and an outlet 1b for air to be treated, and the treatment liquid 2 is stored within this tank 1. Furthermore, the honeycomb filter 3 is arranged with its honeycomb hole in a horizontal direction in the tank 1. The lower part of the filter 3 is immersed in the liquid 2 in the tank 1 to be in contact with the liquid 2, which rises within the filter 3 sucked by surface tension and is supplied to the entire area of the filter 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to deodorization, VOC (Vola
tile Organic Compounds: removal of volatile organic compounds),
The present invention relates to a semi-wet air treatment device used for air cleaning, air sterilization, disinfection, etc.

[0002]

2. Description of the Related Art Toilets, semiconductor factories, clean rooms,
V in sterilization rooms, operating rooms, cold storages, food processing facilities, aircraft cabins, composting facilities and livestock facilities
The air is treated for OC removal, air cleaning, air sterilization and disinfection.

In the conventional wet treatment method, for example, a water scrubber, power such as a pump is required for pumping and circulating the solution. Also, in the processing method of spraying the chemical solution,
Chemicals recovery equipment and power are required. On the other hand, a dry treatment apparatus such as an adsorbent such as activated carbon has a drawback that it is inferior to the wet treatment in treatment capacity and reaction rate due to surface reaction, which is inferior to wet treatment.

[0004]

As described above, the dry processing method has a problem that the processing efficiency is lower than that of the wet processing method. On the other hand, the wet treatment method has a problem that it requires a power facility for pumping up and circulating a solution, and the apparatus is large-scale.

The present invention has been made in view of the above problems, and does not require pumping and circulation of a processing liquid (chemical liquid), does not require power, has a simple apparatus, and can be used for a long time. It is an object of the present invention to provide a semi-wet air treatment apparatus which has a honeycomb filter having a large contact area and remarkably improved treatment efficiency.

[0006]

In the semi-wet air treatment apparatus according to the present invention, the treatment liquid is adhered to the surface of the aggregate, and the honeycomb pores are arranged so that the directions of the honeycomb holes substantially coincide with the flow direction of the treatment air. It has a honeycomb filter, and is treated with the treatment liquid as the treatment air passes through the honeycomb filter.

Another semi-wet air treatment apparatus according to the present invention is
With the treatment liquid tank storing the treatment liquid, the lower portion is brought into contact with the treatment liquid in the treatment liquid tank to suck the treatment liquid by surface tension, and the direction of the honeycomb holes is substantially aligned with the direction in which the treatment air flows. And a honeycomb filter arranged,
The treatment liquid is sucked so as to cover the entire surface of the honeycomb filter, and the treatment air is treated by the treatment liquid by passing through the honeycomb filter.

In these semi-wet air treatment apparatuses, the honeycomb filter is made of, for example, ceramics. The treated air may be forced to flow through the honeycomb filter by a fan.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a schematic side sectional view showing a semi-wet air treatment apparatus according to an embodiment of the present invention, FIG. 2 is a schematic perspective view of a treatment liquid tank, and FIG. FIG. 4 is a schematic perspective view showing
[Fig. 3] is a schematic perspective view showing a state where a honeycomb filter is stored in a treatment liquid tank. The processing liquid tank 1 has a rectangular parallelepiped boat shape, and has a processing air inlet 1a at one end in the longitudinal direction and a processing air outlet 1b at the other end. Processing air is forcibly forced into the inlet 1a and the outlet 1b.
A fan is provided for feeding the air toward the outlet, and the outlet 1b is configured such that the upper portion of the wall is cut off so that the processing air can be discharged.

As shown in FIG. 3, the processing liquid 2 is stored in the processing liquid tank 1. In addition, as shown in FIG. 4, the honeycomb filter 3 is loaded in the treatment liquid tank 1. The honeycomb filter 3 is arranged in the treatment liquid tank 1 so that the honeycomb holes thereof are oriented in the horizontal direction.

As a result, the lower part of the honeycomb filter 3 is immersed in the treatment liquid 2 in the treatment liquid tank 1 and comes into contact with the treatment liquid. Therefore, the treatment liquid 2 is sucked by the surface tension, rises in the honeycomb filter 3, and is supplied to the entire area of the honeycomb filter 3. That is, the treatment liquid 2 is the honeycomb filter 3
Is sucked into the honeycomb filter 3 so as to cover the entire surface of the aggregate.

As a material of the honeycomb filter, a physically soft material such as a cotton-like aggregate of organic or inorganic fibers and a sponge is used when a liquid is sucked for a long time or repeatedly sucked. In particular, contraction of capillaries is likely to occur especially when dried after suction,
The surface tension effect is significantly impaired. If the material is not a chemically stable material, it will be attacked by various chemicals such as acids, bases, organic solvents, etc., and the surface tension will likewise decrease. Ceramics are chemically stable, and physically, capillary contraction hardly occurs.

Therefore, the material of the honeycomb filter is S
Ceramics mainly composed of i, Al, Mg, Ca and the like are desirable. Activated carbon has little general versatility in wettability with chemicals and has wettability only with specific chemicals. In addition, activated carbon has low resistance to chemicals with strong acidity. Highly absorbent materials such as rock wool and peat moss have the advantage that the amount of liquid retained can be increased, but if liquid evaporation or drop occurs, then when the chemical is sucked again, , Because the capillary force is reduced. The suction power drops significantly. In the case of ceramics, it is stable against acids and alkalis, its influence is extremely small, and the physical structure that affects wettability and capillary phenomenon is also stable. Does not fall. Ceramic honeycomb filters include cordierite,
There are oxide-based and non-oxide-based compounds such as zeolite, alumina, mullite, and silicon carbide.

The types of liquids include chemicals containing acids such as phosphoric acid, boric acid, hydrochloric acid, hypochlorous acid, sulfuric acid and hydrogen peroxide, chemicals containing alkalis such as sodium hydroxide and ammonia, methanol and ethanol. Alcohol solutions such as isopropyl alcohol, bleaching powder, various disinfecting solutions, cleaning solutions, and liquids such as water can be used.

The shape of the ceramic honeycomb filter is arbitrary, but for example, the sectional structure of the ceramic honeycomb filter is a square, a circle, a corrugate, or a slit-shaped elongated hole. In order to increase the reaction surface area, it is preferable that the cell density is high, but when the cell density is increased, the cell is inevitably small, and thus inclusions and the like are likely to be clogged. Therefore, the cell density is preferably about ² to 800 cells / in ^{2 for} practical use.

In the semi-wet air treatment apparatus constructed as described above, the treatment air sent from the inlet 1a is
It passes through the honeycomb filter 3 charged in the treatment liquid tank 1 and is discharged from the outlet 1b. Since the honeycomb holes of the honeycomb filter 3 are oriented in the horizontal direction, the process air passes through the honeycomb holes and flows from the inlet 1a toward the outlet 1b. In this case, the treatment liquid is sucked upward from the bottom of the treatment liquid tank 1 inside the honeycomb filter 3 due to the surface tension, and covers the surface of the honeycomb holes of the honeycomb filter 3 (the surface of the aggregate), and the treatment air is The treatment liquid on the surface of the honeycomb pores is brought into contact with the treatment liquid for deodorization or the like. Although the treatment liquid covers the surfaces of the honeycomb holes, it does not block the honeycomb holes, so that the treatment air can pass through the honeycomb filter 3. In the above embodiment, the direction in which the processing liquid is absorbed and the direction in which the processing air passes are different. Therefore, the inside of the end portion of the honeycomb hole is not in contact with the treatment liquid, but the treatment liquid propagates along the end surface on the inlet 1a side and the end surface on the outlet 1b side of the honeycomb filter 3 and rises to the end portion of the honeycomb hole. Penetrates into the inside of the honeycomb holes.

In the above embodiment, a blower fan is provided at the inlet 1a to forcibly supply the process air to the honeycomb filter 3. However, the present invention is not limited to this, and natural convection or diffusion of gas is also effective. is there.

Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment shown in FIG. 1, the honeycomb filter 3 is installed over the entire length of the processing liquid tank 1, but in the second embodiment, the honeycomb filter 3a is installed in a part of the processing liquid tank 1 in the longitudinal direction. Is. As described above, in the present invention, it is not necessary to spread the honeycomb filter 3a over the entire area of the treatment liquid tank 1.

FIG. 6 is a schematic side sectional view showing a third embodiment of the present invention. In the third embodiment, a plurality of divided honeycomb filters 3b are installed in the treatment liquid tank 1. As described above, since there are many independent honeycomb cross sections in the treatment liquid tank 1 and the honeycomb cross sections are in contact with each other, the cross section where the treatment liquid rises increases and the diffusion speed of the treatment liquid is high. There is an advantage.

FIG. 7 is a schematic side sectional view showing a fourth embodiment of the present invention. In the fourth embodiment, a plurality of divided honeycomb filters 3c are arranged so as to be separated from each other, and a gap 3d is provided between them. In the fourth embodiment, since the honeycomb filters 3c are separated from each other, there is an effect that the honeycomb cross section for increasing the treatment liquid increases and the wind velocity distribution in the honeycomb cross section is made uniform.

FIG. 8 is a schematic side sectional view showing a fifth embodiment of the present invention. In the fifth embodiment, the shape of the processing liquid tank 4 is different from that in the first embodiment, and the size of the lower portion 4c for storing the processing liquid 2 and the size of the space 4d through which the processing air flows are different. Therefore, the honeycomb filter 5 has a two-stage structure in which the size of the portion located in the lower portion 4c is different from the size of the portion located in the space 4d through which the treated air flows.

In the fifth embodiment, the treatment liquid permeates into the portion of the honeycomb filter 5 which is immersed in the lower portion 4c in which the treatment liquid 2 is stored, but the treatment liquid penetrates the surface of the honeycomb holes and the inside of the upper space 4d. The treatment liquid also diffuses into the honeycomb filter portion. Therefore, in the fifth embodiment, the honeycomb filter can be made larger than the portion in which the treatment liquid is stored.

FIG. 9 is a cross sectional view showing a sixth embodiment of the present invention. In this embodiment, the processing liquid 8 is stored in the lower portion of the cylindrical processing liquid tank 6. A cylindrical honeycomb filter 7 having a diameter smaller than the inner diameter of the treatment liquid tank 6 is housed in the treatment liquid tank 6.

In the sixth embodiment, while the treatment air passes through the treatment liquid tank 6 in the longitudinal direction thereof, the treatment air passes through the portion of the honeycomb filter 7 exposed above the liquid surface of the treatment liquid 8. However, it is subjected to deodorization and other processing. The cross-sectional shape of the honeycomb filter 7 is not limited to the circular shape shown in FIG. 9, but may be various cross-sectional shapes such as a square, a rectangle, and an ellipse. The cross-sectional shape of the treatment liquid tank 6 is also the same, and the combination of the cross-sectional shapes of the treatment liquid tank 6 and the honeycomb filter 7 is arbitrary.

FIG. 10 is a perspective view showing a seventh embodiment of the present invention. The seventh embodiment does not have a processing liquid tank. A honeycomb filter 9 having a square cross section is covered with a cover 10, and is installed with its longitudinal direction horizontal. Then, the treatment liquid is dripped onto the side surface of the honeycomb filter 9, so that the treatment liquid permeates into the honeycomb filter 9 to coat the surface of the aggregate with the treatment liquid. The cover 10 allows the treatment liquid to pass therethrough, and the dropped treatment liquid passes through the cover 10 and permeates into the honeycomb filter 9.

When the treated air passes through the honeycomb filter 9, it reacts with the treatment liquid adhering to the surface of the aggregate of the honeycomb filter 9 to be deodorized. In addition, instead of supplying the treatment liquid into the honeycomb filter 9 by dropping the treatment liquid at the installation position of the honeycomb filter 9 as in the above-described embodiment, the honeycomb filter 9 is treated at another location in advance. The honeycomb filter 9 may be placed at a predetermined position after being dipped in the liquid to allow the treatment liquid to penetrate into the honeycomb filter 9.

FIG. 11 is a diagram showing an eighth embodiment of the present invention. As shown in the eighth embodiment, the honeycomb filter 12 may be installed in an inclined state with respect to the liquid surface 11 of the treatment liquid. As in the eighth embodiment, if only a part of the honeycomb filter 12, for example, a corner portion is in contact with the treatment liquid, the treatment liquid diffuses throughout the honeycomb filter 12. Therefore, the present invention can be applied to a place where the duct is not horizontal.

[0028]

EXAMPLES Next, the effects of the examples of the present invention will be described in comparison with comparative examples that depart from the scope of the present invention.

[First Example] The semi-wet air treatment apparatus used in the Examples and Comparative Examples had a treatment liquid (chemical liquid) of phosphoric acid and was installed in a temporary toilet. The space velocity is 1000
00 hr ⁻¹ . The space velocity is defined by the ratio of the flow rate to the volume of the honeycomb filter (= (flow rate) / (honeycomb volume)).

Table 1 below shows the structure of the honeycomb filter and
The ammonia outlet concentration after 3 days is shown. As shown in FIG. 12, the cylindrical peat moss of Comparative Example 1 was one in which a cylindrical peat moss was erected in the treatment liquid tank, and during the use, it contracted and did not suck the treatment liquid. The rockwool honeycomb of Comparative Example 2 has a rockwool honeycomb provided in the treatment liquid tank as shown in FIG. 13. Similarly, the treatment liquid does not suck above the liquid surface due to contraction during use. It was On the other hand, in Example 1, cordierite honeycomb was used, ammonia was completely removed even after 3 days, and the outlet concentration was below the detection limit.

[0031]

[Table 1]

[Second Embodiment] The treatment liquid is isopropyl alcohol, and the target facility is a biological clean room hepa (HEPA: High Efficiency Purification Air Fil).
ter) Phil is evening. Table 2 below shows the presence or absence of mold formation in Comparative Example 3 and Example 2. For the presence or absence of mold, attach the HEPA filter after 1 week on the agar medium, and
After culturing at 4 days for 4 days, it was judged. In Comparative Example 3, as shown in FIG. 15, a HEPA filter was provided at the outlet of the treatment liquid tank, and no honeycomb filter was provided inside the treatment liquid tank. However, the treatment liquid exists in the treatment liquid tank. Also,
In Example 2, as shown in FIG. 16, H was added to the outlet of the processing liquid tank.
An EPA filter is provided, and a cordierite honeycomb is further installed in the processing liquid tank. As shown in Table 2, mold was generated in Comparative Example 3 because it did not have a wet apparatus, whereas mold was not generated in Example 2 because it had a wet apparatus.

[0033]

[Table 2]

[Third Embodiment] The chemical solution is a boric acid aqueous solution, and the target facility is compost fermentation equipment. The space velocity is 8
It is 0000 hr ^-1 . Table 3 below shows the test results of Comparative Example 4 and Example 3. In Comparative Example 4, as shown in FIG. 17, cordierite honeycomb filters were arranged in the treatment liquid tank so that their honeycomb holes were vertical.
In Example 3, as shown in FIG. 18, cordierite honeycomb filters were arranged in the treatment liquid tank so that the honeycomb holes were horizontal. As shown in Table 3,
Comparative Example 4 has an ammonia outlet concentration of 100 ppm after 3 days.
That's it. On the other hand, in Example 3, the outlet concentration was below the detection limit even after 3 days.

[0035]

[Table 3]

[0036]

As described above, according to the semi-wet air treatment apparatus of the present invention, the power for pumping up and circulating the treatment liquid (chemical liquid) is not required, the device is simple, and the time is long. It can be processed over. Further, according to the present invention, since a large contact area is obtained by the honeycomb filter, the treatment efficiency is remarkably high.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a semi-wet air treatment apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the processing liquid tank of the same.

FIG. 3 is a perspective view showing a state in which the processing liquid is stored in the same manner.

FIG. 4 is a perspective view showing a state in which the honeycomb filter is also inserted.

FIG. 5 is a side sectional view showing a semi-wet air treatment apparatus according to a second embodiment of the present invention.

FIG. 6 is a side sectional view showing a semi-wet air treatment apparatus according to a third embodiment of the present invention.

FIG. 7 is a side sectional view showing a semi-wet air treatment apparatus according to a fourth embodiment of the present invention.

FIG. 8 is a side sectional view showing a semi-wet air treatment apparatus according to a fifth embodiment of the present invention.

FIG. 9 is a side sectional view showing a semi-wet air treatment apparatus according to a sixth embodiment of the present invention.

FIG. 10 is a side sectional view showing a semi-wet air treatment apparatus according to a seventh embodiment of the present invention.

FIG. 11 is a side sectional view showing a semi-wet air treatment apparatus according to an eighth embodiment of the present invention.

FIG. 12 is a diagram showing Comparative Example 1.

13 is a diagram showing Comparative Example 2. FIG.

FIG. 14 is a diagram showing Example 1.

FIG. 15 is a diagram showing Comparative Example 3.

FIG. 16 is a diagram showing a second embodiment.

FIG. 17 is a diagram showing Comparative Example 4.

FIG. 18 is a diagram showing a third embodiment.

[Description of Reference Signs] 1, 4, 6: Treatment liquid tank 1a: Inlet 1b: Outlet 2: Treatment liquids 3, 3a, 3b, 3c, 5, 7, 9, 12: Honeycomb filter

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Claims (4)

[Claims] 1. A honeycomb filter is provided in which a treatment liquid is adhered to a surface of an aggregate and the honeycomb pores are arranged such that the directions of the honeycomb pores substantially coincide with the flowing direction of the treatment air. A semi-wet air treatment apparatus, wherein the semi-wet air treatment apparatus is treated by the treatment liquid as it passes. 2. A treatment liquid tank that stores the treatment liquid, and a lower portion of the treatment liquid tank is in contact with the treatment liquid in the treatment liquid tank to suck the treatment liquid by surface tension, and the treatment air flows substantially in the direction of the honeycomb air through the honeycomb holes. And a honeycomb filter arranged so as to coincide with each other, and the treatment liquid is sucked so as to cover the entire surface of the honeycomb filter, and the treatment liquid by passing the treatment air through the honeycomb filter. A semi-wet air treatment apparatus characterized by being treated by 3. The semi-wet air treatment apparatus according to claim 1, wherein the honeycomb filter is made of ceramics. 4. The semi-wet air treatment apparatus according to claim 1, wherein the treated air is forced to flow through the honeycomb filter by a fan.