JP2000154006A - Excitation ozonizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ozonizer capable of inhibiting environment deterioration by biochemical lesions due to residual ozone in a room, rapidly oxidizing hydrocarbons having rigid structures, sufficiently adjusting the concentration of ozone when generated, and reducing the cost of a cooler or the like. SOLUTION: The ozone generation process using this ozonizer comprises: placing metal wire or a metal thin film 2, which consists of a metal such as copper, stainless steel, titanium or hastelloy and also is coated with a dielectric material so as to be in contact with or in the vicinity of the glass surface or a dielectric coating of a discharge tube 1, a 5,000-20,000 V high AC voltage between a terminal of the discharge tube 1 and the metal wire or metal thin film 2, to cause a corona discharge, to generate gaseous ozone and concurrently with the ozone generation, to produce ultraviolet rays from a discharge tube filter gas excited by the high voltage electric field and corona discharge. Also, in the ozonizer, air containing an odor component is directly and continuously introduced into the violent reaction field in which both the ultraviolet rays and corona discharge are concurrently caused, and passed through the reaction field, by using an air suction fan 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the recent generation of ozone used for sterilization and deodorization, in an excited state, and at the same time violent destruction from the excited state. The present invention relates to an ozone generator that maintains reactivity and has low residual properties.

[0002]

2. Description of the Related Art Ozone generation methods include a plasma discharge method, a radiation action method, a photochemical action method, and a silent discharge method. Among these, the methods used industrially are mainly the photochemical method and the silent discharge method. In the photochemical method, the wavelength of ultraviolet light (1
At 900 °), oxygen is differentiated and ozone is generated. In this method, only a low concentration of ozone is generated. This is because when the reaction of (1) occurs and ozone is generated, at the same time, photochemical decomposition (Photolysis) and electron collision (elevation) occur.
tron impact, thermal decomposition (therma)
The ozone disappears (2) due to lyssociation. This is because the concentration produced is the equilibrium concentration for these reactions. O2 + e- (hν) → 2O O + O2 → O3 (1) O3 → O + O2 O + O3 → 2O2 (2) In order to generate ozone by this method in a wide range,
It is necessary to secure an area that can transmit ultraviolet light,
It is harmful for humans to be exposed to UV rays directly in the human body in this area. (However, this reaction mechanism is effectively used in the present invention.) Corona discharge (silona discharge)
In discharge, a discharge is caused between the electrodes via a dielectric, where oxygen in the air is ionized to generate ozone. Since this method is simple and generates a relatively high concentration of ozone, it is widely used but has high ozone persistence. As the use in the general society progresses, the generation of peroxides due to the generation of oxygen free radicals by residual ozone, the generation of carbonyl compounds (aldehydes, ketones), thi
ol (R-SH) by oxidation of disulfide (R
-S-S-R), and the deterioration of the environment, which is considered to be biochemical damage due to the generated compounds due to oxidation of olefins, oxidation of high-molecular-weight unsaturated lipids, etc., has been reported.
Here, the persistence of ozone released into the environment becomes a problem, which is a factor that prevents its use from widespread.

[0003]

Ozone has been actively used in a social environment that requires a recent sanitary environment. However, as the use has progressed, not only the sterilizing ability but also the effect of ozone remaining in the air on the human body has been reported by people who actually used it in the form of a worsening working environment. In some cases, even when a relatively low concentration is used, the cost of the production equipment is large, and at a low concentration, the ozone disinfecting ability and the deodorizing ability are not sufficiently exhibited on site. This is because the ozone generated by the conventional ozone generator is gradually decomposed in a room temperature environment, and the reaction rate is relatively slow even when coexisting with a substrate of an odor component which is easily decomposed by oxidation. Incidentally, the half life is 16 hours at a concentration of 1 wt% in the gas phase. Actually, it has been reported that even in a mixed example of ozone and hydrogen sulfide which is a strong reducing odor component, even if the residence time is 4 minutes or more, almost no reaction occurs. It is also reported that the reaction occurs instantaneously when a mixture of ozone and hydrogen sulfide is introduced into an ultraviolet discharge field, but the amount of ozone is about twice as many as the number of moles. Here, ozone is divided into those that react with hydrogen sulfide and those that decompose by photochemical reaction, so that a significant system cannot be constructed with an expensive ozone generator. However, in consideration of the actual oxidizing power of ozone, the environment to be considered for use is factories such as food factories, refrigerators, hospitals, and other closed environments. It is expected to be expressed and to quickly decompose and disappear. That is, after the deodorizing treatment or the sterilizing treatment, it is decomposed in the air in a relatively short time to change into oxygen. It is also important that the degree of deodorization and sterilization can be easily adjusted in an environment that changes daily.However, the method using a conventional ultraviolet lamp has a small amount of generation, and the method using corona discharge has a problem of air insulation. In addition, the amount of generation extremely changes by adjusting the secondary voltage. Further, since the change in the generation amount at the generation site is directly discharged into the room and reflected on the ozone amount, the generation amount and the residual amount are constantly excessive with respect to the necessary amount for ensuring the effectiveness.

[0004]

According to the present invention, one of a pair of electrodes for generating a corona discharge is connected to one end of an ultraviolet discharge tube and the other metal electrode shielded by a dielectric via a gas filled in the discharge tube. Causes corona discharge. At this time, the amount of generated ultraviolet light and the amount of generated ozone are synchronized by controlling the primary voltage. In the method of the present invention, generation and decomposition of ozone occur simultaneously. In addition, in order to use as a deodorizing device and a sterilizing device, room air is introduced into a reaction field where discharge occurs by a ventilation fan and passed therethrough. If necessary, the ventilation amount is tuned to the primary side voltage to smoothly tune the ventilation amount, the amount of ultraviolet radiation, and the amount of ozone generation. Further, as a technique derived from the present invention, the ultraviolet discharge tube is not necessarily provided with a metal discharge electrode, that is, a gas-filled resin tube, a glass tube, or a sphere, as long as there is a gas-encapsulated forming body that guarantees ultraviolet generation. A reaction field of the method can be formed.
In other words, if there is a gas-encapsulated body in which the generation of ultraviolet rays is guaranteed in the high-pressure AC discharge field, the generation of ultraviolet rays can be guaranteed by the excitation of gas molecules. Therefore, the same ozone simultaneous generation mechanism as the apparatus of the present invention exists. Thus, a reaction field having the same effect as the present invention is formed. This method allows for large-scale industrial use.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of the present invention will be described with reference to the drawings. FIG. 1 is a structural diagram of an embodiment of the present invention. The air containing the offensive odor component is introduced into a cylindrical filter case 10 made of resin or metal by an intake fan 7, and is dust-removed by a filter 9 made of glass fiber, metal fiber, or the like. Discharge lamp 1 such as an ultraviolet lamp and a xenon flash lamp installed in an ultraviolet shield 8 made of a metal, a metal wire made of copper, stainless steel, titanium, hastelloy or the like coated with a dielectric, or a corona discharge electrode part 2 made of a metal thin film And flows into a certain region of the dielectric 3 serving as a spacer. Here, a corona discharge is generated between the ultraviolet lamp 1 and the corona discharge unit 2 separated by the dielectric 3 by the high-voltage AC power supplied by the high-voltage AC transformer 4. The high-voltage AC power source is controlled by a voltage regulator 5 on the primary side, and the volume of the ozone generation can be adjusted by increasing or decreasing the secondary side voltage applied to the corona discharge unit 2 and the ultraviolet discharge tube 1. The speed of the intake fan 7 is adjusted by the voltage regulator 5 since the intake fan 7 is also operated at the primary voltage. In this region, the oxygen in the introduced air is partially changed to ozone due to ultraviolet light and a discharge effect, and unlike a conventional ozone generator, is excited to ozone which easily reacts by the action of ultraviolet light. Also, in this region, intense decomposition of excited ozone and radicalization of oxygen molecules occur, and if there is a malodorous component in the air, it immediately oxidizes and decomposes it. The unreacted excited ozone is released to the outside air from the ultraviolet shield 8 by the action of the ultraviolet light, but has high reactivity and is quickly decomposed and eliminated in the room. In the present invention, these mechanisms cause the ionization of air by the action of ultraviolet rays from a state where the secondary voltage is low, the corona discharge rises smoothly, the concentration can be adjusted from a low ozone generation amount, and ozone is excited. Therefore, sufficient reactivity of ozone is ensured even from a low concentration, and since the reactivity is large, the indoor persistence is small.
It has industrial value.

[0006]

The method of the present invention has the following advantages over the conventional ozone generator. (1) Ozone is excited by ultraviolet rays at the same time as being generated by corona discharge, and the excited ozone reacts instantaneously with oxygen radicals generated during the reaction if there is a molecular species that receives electrons in the air. If this is an odor component, the result is that the odor component is instantaneously decomposed, and the reactivity becomes extremely large unlike the case where ozone released by ordinary corona discharge is introduced. For this reason, structurally solid saturated hydrocarbons and aromatic hydrocarbons (such as kerosene odor) can also be rapidly decomposed by oxidation. Also, due to such a mechanism, the process of photochemical decomposition of ozone can be effectively used as a radical reaction. (2) The generation amount of ultraviolet rays and ozone is increased and decreased in synchronization with the voltage adjusting device of the power supply. In addition, the ultraviolet gas and corona discharge simultaneously excite the gas in the ultraviolet discharge tube easily when the secondary voltage is low, and the corona discharge is also induced by the ionization of air by ultraviolet light. Therefore, the generation amount can be adjusted over a wide range. Therefore, the degree of the decomposition reaction to the odor component can be easily adjusted. (3) In the ozone generation method of the present method, a strong reaction field can be formed inside the generator due to the high reactivity of ozone,
Because the decomposition of excited ozone occurs and the amount of ozone remaining in the air decreases rapidly with time,
No unnecessary unreacted ozone remains in the working environment. This becomes very important when ozone is actually used for deodorization and sterilization of air. (4) Since ozone is excited, hydrocarbons that are normally difficult to oxidize with ozone can be rapidly decomposed, so it can be applied not only to indoor deodorization but also to low-level environmental pollution of hydrocarbons expected in the future. it can. (5) It can be produced at low cost from a small-scale device with a simple generation method to a large-scale industrial use. (6) According to the method of the present invention, a reaction field can be formed easily and inexpensively according to the shape of the ultraviolet discharge tube and the corona discharge electrode, so that the method has great industrial applicability.

[Brief description of the drawings]

[Drawing 1]

FIG. 1 is a structural diagram of an embodiment of the present invention. The air containing the offensive odor component is introduced into a cylindrical filter case 10 made of resin or metal by an intake fan 7, and is dust-removed by a filter 9 made of glass fiber, metal fiber, or the like. Discharge lamp 1 such as an ultraviolet lamp and a xenon flash lamp installed in an ultraviolet shield 8 made of a metal, a metal wire made of copper, stainless steel, titanium, hastelloy or the like coated with a dielectric, or a corona discharge electrode part 2 made of a metal thin film And flows into a certain region of the dielectric 3 serving as a spacer. Here, high-voltage AC transformer 4
The corona discharge is generated between the ultraviolet lamp 1 and the corona discharge unit 2 separated by the dielectric 3 with the high-voltage AC power supplied by the above. The high-voltage AC power source is controlled by a voltage regulator 5 on the primary side, and the volume of the ozone generation can be adjusted by increasing or decreasing the secondary side voltage applied to the corona discharge unit 2 and the ultraviolet discharge tube 1. The speed of the intake fan 7 is adjusted by the voltage regulator 5 since the intake fan 7 is also operated at the primary voltage.

FIG. 1 is a structural view of an ozone generator according to the method of the present invention.

[Explanation of symbols]

 1: UV lamp 2: Corona discharge electrode 3: Dielectric 4: High voltage AC transformer 5: Voltage adjustment period 6: AC power supply 7: Intake fan 8: UV shield 9: Filter 10: Filter case

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[Procedure amendment]

[Submission date] April 28, 1999 (1999.4.2
8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a structural diagram of a specific example of the present invention. The air containing the offensive odor component is introduced into a cylindrical filter case 10 made of resin or metal by an intake fan 7, and is dust-removed by a filter 9 made of glass fiber, metal fiber, or the like. Discharge lamp 1 such as an ultraviolet lamp and a xenon flash lamp installed in an ultraviolet shield 8 made of a metal, a metal wire made of copper, stainless steel, titanium, hastelloy or the like coated with a dielectric, or a corona discharge electrode part 2 made of a metal thin film And flows into a certain region of the dielectric 3 serving as a spacer. Here, high-voltage AC transformer 4
The corona discharge is generated between the ultraviolet lamp 1 and the corona discharge unit 2 separated by the dielectric 3 with the high-voltage AC power supplied by the above. The high-voltage AC power source is controlled by a voltage regulator 5 on the primary side, and the volume of the ozone generation can be adjusted by increasing or decreasing the secondary side voltage applied to the corona discharge unit 2 and the ultraviolet discharge tube 1. The speed of the intake fan 7 is adjusted by the voltage regulator 5 since the intake fan 7 is also operated at the primary voltage. Ozone generator structure diagram by the method of the present invention

[Description of Signs] 1: Ultraviolet lamp 2: Corona discharge electrode 3: Dielectric 4: High voltage AC transformer 5: Voltage adjustment period 6: AC power supply 7: Intake fan 8: Ultraviolet shield 9: Filter 10: Filter case

Claims (3)

[Claims] (1) The periphery of a discharge tube characterized by generation of ultraviolet light such as an ultraviolet lamp or a xenon flash lamp is coated with a dielectric in contact with or close to the glass surface of the discharge tube or the dielectric coating of the discharge tube. Install a metal wire such as copper, stainless steel, titanium, Hastelloy, or a metal thin film,
A high-voltage AC voltage of 5,000 to 20,000 V is applied between the terminal of the discharge tube and the metal wire or metal thin film coated with the dielectric to cause corona discharge. (2) The ozone generated by the corona discharge, the high-voltage electric field, and the ultraviolet light generated by the gas sealed in the discharge tube excited by the corona discharge thereat are simultaneously generated. Further, in the method of the present invention, generation and decomposition of ozone occur at the same time due to the synchronism. The generated ozone is simultaneously excited by ultraviolet rays, and becomes extremely decomposable and has strong oxidizing power. (3) A sterilizing and deodorizing apparatus characterized in that air containing an odor component is directly and continuously introduced into and passed through a violent reaction field where ultraviolet rays and corona discharge occur simultaneously by a ventilation fan. 2. The method according to claim 1, wherein the primary side voltage of the high-voltage AC transformer for generating ultraviolet rays and ozone is continuously controlled by an electronic device to synchronize the irradiation amount of ultraviolet rays with the generation amount of ozone. 3. In addition to the first and second aspects, the amount of air blown by the ventilation fan is synchronized with the primary voltage of the high-voltage transformer, so that an appropriate amount of sterilization or deodorization can be performed in the reaction field where ozone generation and collapse occur. To introduce an atmosphere.