JP2001029738A - Gas decomposing apparatus utilizing ultraviolet rays - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject gas decomposing apparatus capable of effectively decomposing target gas such as malodorous gas or the like by a simple structure. SOLUTION: The ultraviolet lamp 15 housed in a protective pipe 17 is arranged in a chamber 14 and target gas is irradiated with ultraviolet rays from the ultraviolet lamp 15 while allowed to flow through the chamber 14 and ozone generated in the space 19 between the ultraviolet lamp 15 and the protective pipe 17 by the irradiation with ultraviolet rays is supplied from the ozone supply pipe 31 arranged on the upstream side of the position where the ultraviolet lamp 15 of the chamber 14 is arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas decomposition apparatus utilizing ultraviolet rays.

[0002]

2. Description of the Related Art Conventionally, there has been a problem of deodorization in a treatment process of a sewage treatment plant, a human waste treatment plant, or the like, and various methods have been implemented for handling odors.

As one of the methods, there is a deodorizing facility utilizing the oxidizing power of ozone. The method of deodorizing using this ozone is very effective. In order to generate and use ozone, it is necessary to make ozone efficiently act on odorous gas. One of the methods is to irradiate odorous gas with ozone by irradiating it with ultraviolet light. Is activated, thereby promoting the reaction between the odorous gas and ozone for effective deodorization. However, although the deodorization by this method is effective, an ultraviolet irradiation device is required in addition to the ozone generation equipment, and there is a problem that not only the large size and space saving cannot be achieved but also the cost reduction is hindered.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a gas decomposer utilizing ultraviolet rays capable of effectively decomposing a target gas such as odor with a simple structure. To provide.

[0005]

In order to solve the above-mentioned problems, a gas decomposition apparatus using ultraviolet rays according to the present invention is provided with an ultraviolet lamp housed in a protective tube in a chamber and flowing a target gas into the chamber. While irradiating the target gas with ultraviolet light from an ultraviolet lamp, the ozone generated in the space between the ultraviolet lamp and the protective tube by the irradiation of the ultraviolet light is supplied to an upstream side of a position where the ultraviolet lamp is installed in the chamber. It is characterized by having comprised so that it may perform. Further, according to the present invention, the ozone generated in the space between the ultraviolet lamp and the protective tube is supplied into the chamber by a forced air supply means or by a negative pressure due to a flow of a target gas passing through the chamber. It is characterized by. In addition, the present invention also provides a method of reversing the direction of flow of a target gas in a chamber on both sides of a bent portion by bending a chamber, and alternately installing protective tubes containing ultraviolet lamps in both chambers, and disposing each ultraviolet ray. An ozone supply pipe connected to the lamp is installed in the other chamber, whereby an ozone supply pipe connected to another ultraviolet lamp is located upstream of the ultraviolet lamp. Further, the present invention is characterized in that a photocatalyst made of a material exhibiting a gas decomposition action by irradiating ultraviolet rays is coated on a surface of a member near the ultraviolet lamp and irradiated with lamp light.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a view showing a gas decomposition apparatus 1 utilizing ultraviolet light according to one embodiment of the present invention, wherein FIG. 1 (a) is a partially cutaway side view, and FIG. 1 (b) is a partially cutaway plan view. . As shown in FIG.
An ultraviolet lamp 15 and an ozone supply pipe 31 are housed in a case 13. Hereinafter, each member will be described.

The case 13 is provided with a chamber 14 for flowing a target gas therein.

[0008] The ultraviolet lamp 15 is provided in a cylindrical protective tube 17, so that the target gas in the chamber 14 does not directly touch the ultraviolet lamp 15.
Here, the ultraviolet lamp 15 emits ozone at 230 nm.
Use the following UV-emitting lamps: 230nm
As long as it generates the following ultraviolet rays, a lamp (for example, a medium-pressure ultraviolet lamp) that simultaneously generates ultraviolet rays of other wavelengths may be used. The protective tube 17 is made of transparent synthetic quartz that transmits light of 230 nm or less.

There is a predetermined space (gap) 19 between the ultraviolet lamp 15 and the protection tube 17, and air is supplied from one end of the protection tube 17 by the blower B. The other end of the protection tube 17 is connected to one end of an ozone supply tube 31 by a pipe 21. The ozone supply pipe 31 is made of, for example, stainless steel, and has a large number of blowout holes 33 on its surface in the longitudinal direction.
It is provided in a row.

The five ultraviolet lamps 15 are arranged in the chamber 14 horizontally and in a plane perpendicular to the flow direction of the target gas (in the cross section of the case 13) in parallel with a ladder shape at equal intervals. In addition, an ozone supply pipe 31 is installed on the upstream side of each connected ultraviolet lamp 15 so as to be parallel to each ultraviolet lamp 15. Two sets are installed.
At this time, the blowing holes 33 of the respective ozone supply pipes 31 face the direction of the connected ultraviolet lamps 15 (ie, the downstream side).

[0011] Further, between the adjacent protective tubes 17 of each set,
A current plate 23 made of metal is attached in parallel with the flow of the target gas. The both surfaces of the current plate 23 and the inner surface of the case 13 near the ultraviolet lamps 15 at both ends (the inner portion of the portion a in FIG. 1A) are made of a material that exhibits a deodorizing action (gas decomposition action) by ultraviolet rays. A photocatalyst, specifically, titanium oxide is coated. That is, the photocatalyst is coated on the surface of the member near the ultraviolet lamp 15 and irradiated with the lamp light.

Next, the operation of the gas decomposition apparatus 1 will be described. First, in a sewage treatment plant, a human waste treatment plant, or the like, the gas decomposer 1 is installed in the middle of an exhaust duct 11 drawn from a deodorization target location, and a target gas having an odor component flows. Then, each ultraviolet lamp 15 of the gas decomposer 1 is turned on, and air is introduced from the blower B into the protection tube 17 and flows into the space 19. The air supplied from the blower B may be from the atmosphere or may be air taken out of the duct 11 on the downstream side of the gas decomposer 1.

The air flowing through the space 19 is the ultraviolet lamp 1
At the same time as being used as the cooling fluid of No. 5, ozone is generated by the irradiation of the ultraviolet light, and is discharged into the chamber 14 from each outlet 33 of the ozone supply pipe 31 installed on the upstream side of the ultraviolet lamp 15.

The ozone released into the chamber 14 is
Oxidation of the target gas flowing through the chamber 14 is oxidatively decomposed by contact with the odor component. Ozone is activated by the irradiation of ultraviolet rays from an ultraviolet lamp 15 installed on the downstream side thereof, which further enhances the effect. The oxidative decomposition reaction of the odor component is promoted, and the odor component is deodorized.

Further, in this embodiment, as described above, the surface of the member (part of the rectifying plate 23 or the inner surface of the case 13) to which the lamp light is irradiated near the ultraviolet lamp 15 is coated with the photocatalyst. Deodorization is also performed when an odor component comes into contact with the surface of the catalyst. The effective wavelength of ultraviolet light for photocatalyst is 350-400nm
Therefore, although different from the ozone generation region, two types of ultraviolet lamps 15 to be used may be used for each wavelength, or a medium-pressure ultraviolet lamp that generates both wavelengths in a wide range may be used.

In the above-described embodiment, a set of five ultraviolet lamps 15 installed horizontally in a ladder shape in the vertical direction is provided.
Since two sets are installed in the flow direction of the target gas, it is possible to perform operation management such as stopping operation of one of the sets according to the odor concentration. The same applies when three or more sets are installed.

FIG. 2 is a view showing a gas decomposition apparatus 1-2 utilizing ultraviolet rays according to another embodiment of the present invention. FIG. 2 (a) is a partially cutaway side view, and FIG. It is a fragmentary plan view. Note that the same or corresponding parts as those of the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The gas decomposer 1-2 also has a case 13 in which two sets of five ultraviolet lamps 15 and an ozone supply pipe 31 are housed in the case 13 as in the above embodiment. The protection tube 1 of the ultraviolet lamp 15 used in this embodiment
Reference numeral 7 is simply open to the atmosphere without connecting one end to the blower B as in the above-described embodiment.

The ozone supply pipe 3 used in this embodiment
The shape 1 is a substantially elliptical shape as shown in the cross section in FIG. 3, and is formed by providing blowout holes 33 on the upper and lower sides on the downstream side. By forming the ozone supply pipe 31 in such a shape, a negative pressure is generated on the downstream surface of the ozone supply pipe 31 due to a change in the velocity of the flow of the target gas on the surface of the ozone supply pipe 31, and the blowing pressure 33 is generated by the negative pressure. The gas in the ozone supply pipe 31 is sucked out of the air. Therefore, according to this embodiment, the blower B and its piping used in the embodiment shown in FIG. 1 become unnecessary. In this embodiment, the rectifying plate 23 shown in FIG. 1 is omitted.

This gas decomposer 1-2 is installed in the middle of the exhaust duct 11 drawn out of the deodorizing target location, and the target gas having an odor component is caused to flow to each ultraviolet lamp 1
When the lamp 5 is turned on, the protection tube 1 is turned on by the flow of the target gas.
Air is introduced into the space 7, flows through the space 19, cools the ultraviolet lamp 15, and at the same time emits ozone by irradiation of ultraviolet light, and is sucked into the chamber 14 from each outlet 33 of the ozone supply pipe 31. Oxidation is carried out by contact with the odor component of the target gas flowing through the ozone.
Activated by the irradiation of ultraviolet rays, the oxidative decomposition reaction of the odor component is further effectively promoted and the odor component is deodorized.

The operation management such as stopping the operation of any one of the set of five ultraviolet lamps 15 in accordance with the odor concentration is the same as in the above embodiment.

FIG. 4 is a view showing a gas decomposition apparatus 1-3 utilizing ultraviolet rays according to still another embodiment of the present invention. FIG. 4 (a) is a partially cutaway plan view, and FIG. It is AA sectional drawing of the same figure (a). Note that the same or corresponding parts as those of the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, the structure of a case 13 is different from the above embodiments. In other words, the case 13 of this embodiment has the chambers 14a, 14a therein.
b is bent by 180 degrees so that the flow directions in the chambers 14a and 14b on both sides partitioned by the intermediate wall 25 provided thereby are reversed.

On the other hand, protective tube 1 containing ultraviolet lamp 15
7 are alternately installed in both chambers 14a and 14b, and connected to ozone supply pipes 31 which are installed so as to penetrate the intermediate wall 25 and protrude into the opposite chambers 14b and 14a, respectively. Thus, the outlet 33 of the ozone supply pipe 31 connected to the adjacent ultraviolet lamp 15 is located upstream of each ultraviolet lamp 15.

This gas decomposer 1-3 is a set of four ultraviolet lamps 1 arranged vertically in a case 13 vertically.
5 and four ozone supply pipes 31 are accommodated in the gas flow direction. In this embodiment, one end of the protective tube 17 of the ultraviolet lamp 15 is not connected to the blower B as in the embodiment shown in FIG. The ozone supply pipe 31 also has a substantially elliptical cross-section and is provided with blowout holes 33 on upper and lower sides on the downstream side, similarly to the ozone supply pipe 31 shown in FIG. A negative pressure is generated on the downstream surface of the ozone supply pipe 31 due to a change in the velocity of the gas flow on the surface of the supply pipe 31, and the negative pressure causes the ozone supply pipe 3 to flow from the outlet 33.
The gas inside 1 is sucked out.

Then, when the target gas having the odor component extracted from the deodorization target place is flowed into the chambers 14a and 14b and the respective ultraviolet lamps 15 are turned on, air is sucked into the protective tube 17 by the flow of the target gas, Space 19
At the same time as the ultraviolet lamp 15 is cooled, and at the same time, the ozone is generated by the irradiation of the ultraviolet light. The ozone is directly sucked out from the outlet holes 33 of the ozone supply pipe 31 on the opposite side of the intermediate wall 25 into the chambers 14a and 14b.
The odor component of the target gas flowing through the inside of the gas 14b is oxidized and decomposed by contact with the odor component, and the ozone is activated by irradiation of ultraviolet rays from an ultraviolet lamp 15 provided on the downstream side thereof, thereby oxidizing and decomposing the odor component. The reaction is accelerated and deodorized effectively.

It is to be noted that the operation management such as stopping the operation of any one of the set of four ultraviolet lamps 15 according to the odor concentration is the same as in the above embodiment.

When the gas decomposer 1-3 is constructed as in this embodiment, the apparatus can be made more compact than in the above embodiments.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the technical idea described in the claims. .

For example, in the above embodiment, a gas having an odor component is shown as a target gas to be decomposed by ozone and ultraviolet rays. However, any gas that has a component decomposable by ozone and ultraviolet rays can be applied to any other gas. You may. That is, for example, a gas containing another organic substance or an organic chlorine compound such as dioxin may be applied to oxidatively decompose the gas.

In the embodiment shown in FIG. 1, a blower is used as a means for forcibly blowing air, but other various forced air supply means such as a fan may be used.

The gas decomposer is also effective when used as a complementary device when the processing capacity of an existing gas decomposer becomes insufficient.

[0033]

As described in detail above, the present invention has the following excellent effects. The mixture of ozone and the target gas is irradiated with ultraviolet rays to activate the ozone, thereby promoting the reaction between the target gas and ozone and effective deodorization.

The structure is simple, the size can be reduced, and the cost can be reduced.

It can be easily mounted simply by being installed in the middle of the exhaust duct, and does not take up space.

When ozone is supplied into the chamber by negative pressure due to the flow of gas passing through the chamber, there is no need to provide a separate forced air supply means, and the structure is simpler and more compact. .

By bending the chamber,
The flow direction in the chambers on both sides of the bent part is reversed, while protective tubes containing ultraviolet lamps are alternately installed in both chambers, and ozone supply tubes connected to each ultraviolet lamp are installed in the other chamber However, if the ozone supply pipe connected to another ultraviolet lamp is located upstream of the ultraviolet lamp, the size of the apparatus can be further reduced.

When the surface of a member near the ultraviolet lamp and irradiated with lamp light is coated with a photocatalyst made of a material that exhibits a gas decomposing action by irradiation with ultraviolet light, deodorization can be performed more effectively.

[Brief description of the drawings]

FIG. 1 is a view showing a gas decomposition apparatus 1 using ultraviolet light according to one embodiment of the present invention, wherein FIG. 1 (a) is a partially cutaway side view, and FIG. is there.

FIG. 2 is a view showing a gas decomposition apparatus 1-2 using ultraviolet light according to another embodiment of the present invention, wherein FIG. 2 (a) is a partially cut-away side view, and FIG. It is a top view.

3 is an enlarged cross-sectional view of the ozone supply pipe 31. FIG.

FIG. 4 is a view showing a gas decomposition apparatus 1-3 using ultraviolet light according to still another embodiment of the present invention, wherein FIG. 4A is a partially cutaway plan view, and FIG. A- of (a)
It is A sectional drawing.

[Explanation of symbols]

 1, 1-2, 1-3 Gas decomposition apparatus using ultraviolet rays 11 Duct 13 Case 14 Chamber 15 Ultraviolet lamp 17 Protective tube 19 Space 21 Pipe 23 Rectifying plate 31 Ozone supply pipe 33 Blow-out hole B Blower (forced air supply means) 14a, 14b Chamber 25 Intermediate wall

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D002 AA21 AB02 AC10 BA05 BA09 CA20 DA11 DA21 DA51 DA70 GA01 GB02 GB04 GB20 HA03 4G042 CA03 4G075 AA07 AA37 AA37 BA01 BA05 BA06 BD12 BD22 CA33 EB22 EB23 EB31 EC02 EC09 FB01 FC04

Claims (4)

[Claims] 1. An ultraviolet lamp housed in a protective tube is installed in a chamber, and the target gas is irradiated with ultraviolet light from the ultraviolet lamp while flowing the target gas into the chamber, and the ultraviolet lamp and the protective tube are irradiated by the ultraviolet light. A gas decomposition apparatus utilizing ultraviolet light, wherein the ozone generated in the space between the two is supplied to an upstream side of a position of the chamber where the ultraviolet lamp is installed. 2. The ozone generated in the space between the ultraviolet lamp and the protective tube is supplied by forced air supply means or negative pressure by the flow of a target gas passing through the chamber.
2. The method according to claim 1, wherein the liquid is supplied into the chamber.
A gas decomposition apparatus using the ultraviolet rays described in the above. 3. By folding the chamber,
The flow direction of the target gas in the chambers on both sides of the bent portion is reversed, and on the other hand, protective tubes containing ultraviolet lamps are alternately installed in both chambers, and the ozone supply pipe connected to each ultraviolet lamp is connected to the other chamber. The gas decomposition apparatus using ultraviolet light according to claim 1 or 2, wherein the ozone supply pipe connected to another ultraviolet lamp is located upstream of the ultraviolet lamp. 4. A photocatalyst made of a material which exerts a gas decomposition action by irradiation of ultraviolet rays, is coated on a surface of a member near the ultraviolet lamp which is irradiated with lamp light. A gas decomposition apparatus using ultraviolet light according to claim 1.