JP3633127B2 - Air deodorization method and air deodorization apparatus using ozone water - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air deodorizing method and a deodorizing apparatus for purifying a processing gas containing odor components and dusts, and in particular, by ozone water that effectively removes malodorous components in the processing gas using ozone water. The present invention relates to an air deodorization method and an air deodorization apparatus.
[0002]
[Prior art]
In general, combustion exhaust gas generated at garbage incineration facilities, thermal power plants, etc. is cleaned through a dust collector, denitration, desulfurization device, etc. and then released into the atmosphere. At present, most of dirty air containing dust and malodorous components discharged from garbage pits, hospitals, factories and the like is filtered through a simple filter and then released into the atmosphere as it is.
[0003]
Therefore, for example, in Japanese Examined Patent Publication No. 4-35206, a spray nozzle is provided at the top of the packing in the packed tower through which the processing gas flows, and a hopper in which ozone water is stored at the bottom thereof. An air purifier has been proposed that purifies the processing gas by removing dust from the processing gas flowing in the packed tower and deodorizing with ozone by pumping up the water with a pump and spraying it on the top of the packing. Yes.
[0004]
[Problems to be solved by the invention]
By the way, in such a conventional air purifier, ozone water is sprayed from the upper part of the filling so that the processing gas and ozone water are brought into gas-liquid contact in the filling. There was a problem that contact efficiency was poor and effective deodorization could not be performed. That is, the ozone water sprayed from the spray nozzle is sprayed in a state of a relatively large particle size in the form of water droplets, but in order to increase the contact efficiency, when sprayed in a mist shape to reduce the particle size of the ozone water, sprayed ozone water is flowed to the downstream side together with the process gas prior to reach into the filling, immediately removed effectively deodorizing mist removing apparatus in the downstream before sufficient reaction is carried out There was inconvenience that it was not done.
[0005]
Therefore, the present invention has been devised to effectively solve such problems, and the object thereof is a novel air deodorizing method and air using ozone water, which can greatly improve the deodorizing efficiency with respect to the processing gas. A deodorizing apparatus is provided.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention sprays ozone water into the processing gas before being introduced into the packed tower, so that the contact reaction between the processing gas and ozone water is sufficiently performed, A high deodorizing effect can be obtained for malodorous components in the processing gas.
[0007]
In addition, by irradiating ultraviolet light to the mist-like ozone water after spraying in this way to generate a large amount of hydroxyl radicals (hereinafter referred to as OH radicals) that are more excellent in oxidative degradation than ozone water, Furthermore, the deodorizing effect can be greatly improved. That is, in ozone water, when ozone gas dissolves in water, some OH radicals with very strong oxidative decomposition power are generated. , By generating a large amount of OH radicals, the oxidative decomposition power of ozone water is greatly improved. As a result, malodorous components such as alcohols and lower fatty acids in the processing gas that cannot be decomposed by ozone can be effectively oxidized and deodorized.
[0008]
Also, or the OH radical is reacted with ozone and hydrogen peroxide (H ₂ O _2), it is possible also in a large amount is generated by increasing the water oxides ion concentration of ozone in water, as described above Further effective deodorization can be performed by spraying into the space to be deodorized simultaneously with ultraviolet irradiation or by adding an alkali agent to ozone water.
[0009]
And, as a specific device for realizing these deodorizing methods, is connected to the inlet of the packed column for removing dust contained in processing gas, a duct for introducing a processing gas, the duct and ozone water spray means to the processing gas flowing through the inner spraying ozone water mist, further, in which a ultraviolet irradiation lamp for irradiating ultraviolet rays to the ozone water is mist.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
[0011]
FIG. 1 shows an embodiment of an ozone deodorizing apparatus using ozone water according to the present invention. In FIG. 1, reference numeral 1 denotes a packed tower for cleaning and discharging a processing gas, and 2 denotes an inlet 1a of the packed tower 1. The connected duct 3 is ozone water spraying means provided in the duct 2, and 18 is an ultraviolet irradiation lamp provided in the reaction space 6 .
[0012]
First, the packed column 1 is filled with a packing 5 in the middle of the column-shaped main body 4, and a reaction space 6 communicating with the processing gas inlet 1a is formed at the lower part of the packing. A plurality of spray nozzles 7 are provided in the upper part of the reaction space 6, and water in a water tank 8 formed at the lower part of the reaction space 6, that is, at the bottom of the tower-like body 4 is pumped up by a pump 9 and filled. It sprays on the object 5. Further, a mist removing means 10 and an ozone decomposition layer 11 in which an ozone decomposition catalyst and the like are laminated in layers are provided at the exhaust port 1b at the top of the tower body 4. The filler 5 is made of a stainless steel wire or the like having excellent corrosion resistance formed in a mesh or cotton shape, or a collection of plastic or ceramic pieces, and is excellent in liquid permeability as well as processing gas. Have a structure.
[0013]
Next, the ozone water spraying means 3 includes an ozone water manufacturing apparatus 12 that manufactures high-concentration ozone water, and a spray nozzle 13 that faces the duct 2. The ozone water production apparatus 12 may be any apparatus that can continuously produce high-concentration ozone water, and those conventionally used can be used as they are. For example, as one conventional ozone water production apparatus, as shown in FIG. 2, raw water (tap water or the like) is supplied to an ozonizer 14 that generates ozone from oxygen in the air by silent discharge via an ejector 15. Supply ozone to dissolve ozone in raw material water to form ozone water, temporarily store the ozone water in the ozone water tank 16, and supply the ozone water to the spray nozzle 13 side by a pump 17 as appropriate. It is like that.
[0014]
The other end of the duct 2 is connected to an exhaust port of a processing gas generating space (not shown) such as a hospital, a factory house, a garbage pit, etc., and the processing gas is forcibly filled with a blower fan (not shown) or the like. It is an exhaust passage that flows to the side.
[0015]
In the above, first, the processing gas flowing in the duct 2 is sufficiently mixed with ozone water sprayed from the ozone water spraying means 3 before flowing into the reaction space 6 from the inlet 1a of the packed tower 1 as shown in FIG. After reaching the reaction space 6, the malodorous component contained in the processing gas in the reaction space 6 is sufficiently brought into contact with the mist-like ozone water to be oxidatively decomposed and deodorized, and then flows into the packing 5 side. become. At this time, since the provided ultraviolet irradiation lamp 18 in the reaction space 6 as shown, ultraviolet having a specific wavelength is irradiated to the sprayed ozone water into the reaction space 6. Thus, oxidative decomposition force is very strong OH radicals are generated in large quantities in ozone water, the effect of hardly decomposable organic compounds such as hard alcohols and lower fatty acid to decompose under normal ozone water alone It can be decomposed automatically, and an excellent deodorizing effect can be exhibited. That is, when ozone is irradiated with ultraviolet rays (hv <310 nm) and the ozone is decomposed into ultraviolet rays, excited oxygen atoms ( ¹ D) are generated (O ₃ → O ₂ + O ( ¹ D)), which reacts with water to generate OH. After the radical is generated (O ( ¹ D) + H ₂ O → 2HO ^· ), the generated OH radical further reacts with ozone to become a HO ₂ radical (HO ^· + O ₃ → HO ₂ ^· + O ₂ ). HO ₂ radical is the chain reaction of generating again OH radicals react with ozone is formed ^{_{(HO 2 · + O 3 →}} HO · + O 2). And since this OH radical has an excellent reaction rate constant with respect to hard-to-decompose organic compounds such as alcohols and lower fatty acids that cannot be decomposed by ozone, this OH radical is actively generated to generate ozone water. By using it together, it becomes possible to exhibit an excellent deodorizing effect.
[0016]
After that, the processing gas deodorized in this way flows from the reaction space 6 into the packing 5 and further passes through this, so that the water (ozone water) sprayed from the spray nozzle 7 causes soot such as dust. Then, mist (water droplets) is removed from the exhaust port 1b by the mist removing means 12, and unreacted ozone is decomposed into harmless oxygen by the ozone decomposition layer 11, and then becomes clean gas in the atmosphere. Will be released.
[0017]
Thus, according to this embodiment, the duct 2 connected to the inlet of the packed column 1, the ozone water spray means 3 for spraying ozone water is provided, before flowing through the packed column 1 side processing gas Since ozone water is sprayed in the form of a mist, the contact ratio between the treatment gas and the ozone water is improved, and it is possible to effectively oxidize and decompose malodorous components in the treatment gas for deodorization. . Further, according to the present embodiment, since the ultraviolet irradiation lamp 18 is provided in the reaction space 6, a large amount of OH radicals are generated in the ozone water, and the hardly decomposable organic compound can be effectively decomposed. It becomes possible and the deodorizing effect is further enhanced. Incidentally, the spray position of the ozone water in order to increase the contact time between the process gas and the ozone water, it is preferable to provide as much as possible upstream of the duct 2.
[0018]
3 to 7 show another embodiment of the present invention.
[0019]
First, in FIG. 3, a two-fluid type is used as the spray nozzle 13 of the ozone water spray means 3 and a compressor 19 is connected to the nozzle. The particle size is further reduced by the high-pressure air blown from the compressor 19. It becomes possible to spray ozone water, and the deodorizing effect can be further improved. Furthermore, if the ozone gas supply line 20 is connected to the spray nozzle 13 side, the ozone gas surplus on the ozone water production apparatus 12 side is drawn in and blown into the duct 2 together with the ozone water, the ozone gas is effectively removed. Can be used. Furthermore, the ozone gas supply line 20 is connected to the compressor 19 side so that excess ozone gas can flow from the compressor 19 to the spray nozzle 13 side instead of high-pressure air or with high-pressure air, as shown in FIG. The water in the water tank 8 may be used as a raw material for obtaining ozone water by flowing to the pump 9 side for circulating.
[0020]
Next, FIG. 4 is a device in which a hydrogen peroxide spray means 21 is further added to the apparatus configured as described above to further improve the deodorizing effect. The hydrogen peroxide solution spray means 21 includes a hydrogen peroxide tank 22 and a spray nozzle 13, and sprays hydrogen peroxide water (H ₂ O ₂ ) into the duct 2 together with ozone water sprayed from the ozone water spray means 3. By doing so, in addition to the ability to deodorize and disinfect hydrogen peroxide, the amount of OH radicals generated in ozone water is increased to further improve the deodorizing effect. That is, the deodorizing method, as shown in the following formula are those formed by combining two of photolysis and hydrogen peroxide and ozone reaction of the ozone, hydrogen peroxide can be dissociated HO ₂ ^- and Ozone reacts to generate OH radicals and HO ₂ radicals, and this reaction is introduced to form a chain reaction system of OH radicals and HO ₂ radicals mediated by ozone.
[0021]
hv <310nm
O ₃ → O ₂ + O ( ¹ D)
O ( ¹ D) + H ₂ O → 2HO ^·
H ₂ O ₂ + H ₂ O ← → H ₃ O ⁺ + HO ₂ ⁻
O ₃ + HO ₂ ⁻ + H ⁺ → HO ^· + HO ₂ ^· + O ₂
HO ^・ + O ₃ → HO ₂ ^・ + O _{2
^{HO 2 · + O 3 → HO}} · + O 2
^{_{HO · + H 2 O 2 →}} HO 2 · + O 2
Incidentally, in addition to such OH radicals using ultraviolet light, aqueous hydrogen peroxide, as described above, by raising the pH of the ozone water by increasing the water oxides ion concentration, radical chain reaction as shown below There from being formed, as shown in FIG. 2, may be to introduce a predetermined amount of the alkali agent to ozone water before being sprayed keep increasing the water oxides ion concentration of ozone water.
[0022]
^{_{OH - + O 3 → O 2}} · + HO 2 ·
HO ^・ + O ₃ → HO ₂ ^・ + O _{2
^{HO 2 · + O 3 → HO}} · + O 2
Next, FIG. 6 shows that the spray nozzle 7 is directly connected to the ozone water production apparatus 12 side and sprays high-concentration ozone water to the filler 5 side. While the reaction efficiency in the thing 5 can be improved, the pump 9 etc. which circulate the water tank 8 and ozone water become unnecessary. In FIG. 7, the spray direction of the spray nozzle 13 is opposite to that of the above embodiment, and ozone water is sprayed on the upstream side of the processing gas. Although the pressure loss occurs, the contact time with the processing gas becomes longer, and the reaction time can be increased accordingly. In particular, this method is more effective as the distance of the duct 2 becomes shorter. Needless to say, when generating the OH radical as described above, each of the above methods may be used alone or in combination as required.
[0023]
【The invention's effect】
According to the brief present invention above, previously sprayed excellent ozone water reactivity before the process gas introduced into the packed tower was to react by irradiation with ultraviolet rays to the sprayed ozone water For this reason, it is possible to exhibit excellent effects such as effective and reliable deodorization of malodorous components in the processing gas.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an embodiment of the present invention.
FIG. 2 is a schematic view showing an example of an ozone water production apparatus used in the present invention.
FIG. 3 is an explanatory view showing another embodiment of the present invention.
FIG. 4 is an explanatory diagram showing another embodiment of the present invention.
FIG. 5 is an explanatory diagram showing another embodiment of the present invention.
FIG. 6 is an explanatory diagram showing another embodiment of the present invention.
FIG. 7 is an explanatory diagram showing another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Packing tower 2 Duct 3 Ozone water spray means 5 Packing 6 Reaction space 13 Spray nozzle 18 Ultraviolet irradiation lamp 20 Ozone gas supply line 21 Hydrogen peroxide water spray means

Claims (6)

In an air cleaning method in which a processing gas containing odor components and dust is guided and passed through the packed tower for cleaning, ozone water is fogged into the processing gas before being introduced into the packed tower . A method of deodorizing air with ozone water, wherein the sprayed ozone water is irradiated with ultraviolet rays to generate a large amount of hydroxyl radicals (OH radicals) to deodorize the processing gas. In an air cleaning method in which a processing gas containing odor components and dust is guided and passed through the packed tower for cleaning, ozone water and excess water are contained in the processing gas before being introduced into the packed tower. An air deodorization method using ozone water, wherein hydrogen oxide water is sprayed in a mist to generate a large amount of hydroxyl radicals (OH radicals) to deodorize the processing gas. The ozone water before the spraying, the ozone water according to claim 1 or 2 as a large quantity of generated hydroxyl radicals (OH radicals) to increase the hydroxide ion concentration by adding an alkaline agent to increase the pH By air deodorization method. A duct for introducing the processing gas connected to the entrance of the packed tower for removing dust contained in the processing gas, and an ozone water spraying means for spraying ozone water to the processing gas flowing in the duct in the form of a mist An air deodorizing apparatus using ozone water, comprising: an ultraviolet irradiation lamp for irradiating sprayed ozone water with ultraviolet rays. It is connected to the inlet of the packed column for removing dust contained in the process gas, a duct for introducing a processing gas, ozone water is sprayed into the process gas flowing in the duct ozone water mist An air deodorizing apparatus using ozone water, comprising: a spraying means and a hydrogen peroxide solution spraying means for spraying hydrogen peroxide solution . A duct connected to an inlet of a packed tower for removing dust and the like contained in the processing gas and introducing the processing gas; an ozone water spraying means for spraying ozone water to the processing gas flowing in the duct in a mist form; An air deodorizing apparatus using ozone water, comprising: a hydrogen peroxide solution spraying means for spraying hydrogen peroxide solution; and an ultraviolet irradiation lamp for irradiating the sprayed ozone water with ultraviolet rays.

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