WO2005080264A1 - オゾン発生装置およびオゾン発生方法 - Google Patents
オゾン発生装置およびオゾン発生方法 Download PDFInfo
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- WO2005080264A1 WO2005080264A1 PCT/JP2004/009277 JP2004009277W WO2005080264A1 WO 2005080264 A1 WO2005080264 A1 WO 2005080264A1 JP 2004009277 W JP2004009277 W JP 2004009277W WO 2005080264 A1 WO2005080264 A1 WO 2005080264A1
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- Prior art keywords
- ozone
- discharge
- gas
- electrode
- dielectric
- Prior art date
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 291
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 142
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 104
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 56
- 239000000126 substance Substances 0.000 claims abstract description 47
- 230000001699 photocatalysis Effects 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000011941 photocatalyst Substances 0.000 claims description 93
- 238000006243 chemical reaction Methods 0.000 claims description 43
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 34
- 239000000843 powder Substances 0.000 claims description 22
- 239000003054 catalyst Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 9
- 239000003989 dielectric material Substances 0.000 claims description 6
- 230000003197 catalytic effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 230000001678 irradiating effect Effects 0.000 claims 1
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 35
- 239000006227 byproduct Substances 0.000 abstract description 13
- 230000002459 sustained effect Effects 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 description 84
- 239000001301 oxygen Substances 0.000 description 83
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 80
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 36
- 125000004430 oxygen atom Chemical group O* 0.000 description 31
- 230000007246 mechanism Effects 0.000 description 26
- 238000010586 diagram Methods 0.000 description 23
- 239000002994 raw material Substances 0.000 description 20
- 229910052786 argon Inorganic materials 0.000 description 18
- 238000010494 dissociation reaction Methods 0.000 description 18
- 230000005593 dissociations Effects 0.000 description 16
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- 230000007423 decrease Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 230000009471 action Effects 0.000 description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 7
- 238000000354 decomposition reaction Methods 0.000 description 7
- 239000012535 impurity Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910017604 nitric acid Inorganic materials 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000027455 binding Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 239000001307 helium Substances 0.000 description 5
- 229910052734 helium Inorganic materials 0.000 description 5
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 229910052724 xenon Inorganic materials 0.000 description 5
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 230000031700 light absorption Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- -1 oxygen ions Chemical class 0.000 description 4
- 230000001737 promoting effect Effects 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910002089 NOx Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005281 excited state Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000002574 poison Substances 0.000 description 3
- 231100000614 poison Toxicity 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000005979 thermal decomposition reaction Methods 0.000 description 3
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 2
- XDCUQYOMECICEW-UHFFFAOYSA-N [N].O=O Chemical compound [N].O=O XDCUQYOMECICEW-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 208000018459 dissociative disease Diseases 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000005283 ground state Effects 0.000 description 2
- 229910052754 neon Inorganic materials 0.000 description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000005949 ozonolysis reaction Methods 0.000 description 2
- 238000013032 photocatalytic reaction Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- RSPISYXLHRIGJD-UHFFFAOYSA-N OOOO Chemical compound OOOO RSPISYXLHRIGJD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- OGIIWTRTOXDWEH-UHFFFAOYSA-N [O].[O-][O+]=O Chemical compound [O].[O-][O+]=O OGIIWTRTOXDWEH-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 238000006303 photolysis reaction Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 235000012431 wafers Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/10—Preparation of ozone
- C01B13/11—Preparation of ozone by electric discharge
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/10—Preparation of ozone
-
- B01J35/39—
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2201/00—Preparation of ozone by electrical discharge
- C01B2201/10—Dischargers used for production of ozone
- C01B2201/12—Plate-type dischargers
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2201/00—Preparation of ozone by electrical discharge
- C01B2201/30—Dielectrics used in the electrical dischargers
- C01B2201/32—Constructional details of the dielectrics
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2201/00—Preparation of ozone by electrical discharge
- C01B2201/30—Dielectrics used in the electrical dischargers
- C01B2201/34—Composition of the dielectrics
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2201/00—Preparation of ozone by electrical discharge
- C01B2201/60—Feed streams for electrical dischargers
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2201/00—Preparation of ozone by electrical discharge
- C01B2201/60—Feed streams for electrical dischargers
- C01B2201/64—Oxygen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2201/00—Preparation of ozone by electrical discharge
- C01B2201/70—Cooling of the discharger; Means for making cooling unnecessary
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2201/00—Preparation of ozone by electrical discharge
- C01B2201/80—Additional processes occurring alongside the electrical discharges, e.g. catalytic processes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2201/00—Preparation of ozone by electrical discharge
- C01B2201/80—Additional processes occurring alongside the electrical discharges, e.g. catalytic processes
- C01B2201/82—Treatment with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2201/00—Preparation of ozone by electrical discharge
- C01B2201/90—Control of the process
Definitions
- the present invention relates to an ozone generator and an ozone generation method, and more particularly to an ozone generator and an ozone generator having a high-voltage electrode and a low-voltage electrode, in which an AC voltage is applied between the electrodes to generate a discharge and efficiently generate ozone gas. This is related to the method of generating an error. Background art
- the ozone generator supplies a predetermined flow rate from an oxygen cylinder with a purity of 99.995% or more.
- the raw material gas is supplied from the raw material supply system and the second raw material supply system that supplies a predetermined flow rate of the second raw material gas (nitrogen, helium, argon, or carbon dioxide) with a purity of 99.9% or more.
- a high-voltage AC voltage is applied to the electrode to generate a silent discharge (dielectric barrier discharge) between the electrodes via a dielectric, and convert the source gas to ozone gas.
- the cause of the decrease in ozone concentration over time is unknown, but the ozone gas is generated once in the generator, but with high-purity oxygen, a temporary decrease is observed, and the decrease over time is suppressed. As a means, it is said to be effective to add nitrogen gas or the like to high-purity oxygen.
- Japanese Patent No. 264 1956 (P. 1-4, FIG. 2-3), the mixing ratio of oxygen gas and nitrogen gas, which are source gases of an ozone device, is set to 1: 0.0002. (200 p pm) to 0.03 (3300 ppm) Is shown.
- FIG. 2 of Japanese Patent No. 264 1956 shows the characteristics of the amount of nitrogen gas added and the ozone concentration obtained by the ozone generator, and shows that a sufficient ozone concentration (about 100 g / m 3 or more) is set to 1: 0.0002 as the amount of nitrogen added to obtain nitrogen.
- the mixing ratio is set to 1: 0.00.33 or less in order to keep the amount of nitrogen oxides, which are reactive poisons, from the generator low.
- the ozone concentration is only 20 g / m 3 (93 3 3 ppm). It is shown that an ozone concentration of less than 1 Z 6 can be obtained for a concentration of 120 g / m 3 (560 000 ppm). Further, although in the specification was added to argon gas in a high-purity oxygen instead of nitrogen gas, without depending on ⁇ argon mixing ratio 2 0 g / m 3 (9 3 3 3 ppm) of about O zone down concentration only No results were obtained, indicating that there is no effect of increasing the ozone concentration by argon gas.
- JP-A-1 1 - In 2 1 1 1 0 JP the ozone generating apparatus, there is formed a T i 0 2 film on the discharge surface of the dielectric.
- titanium oxide with a metal element ratio of 10 wt% or more is coated on the discharge surface of the dielectric in the generator.
- the amount of nitrogen added is set to 0.0 in order to suppress a decrease in ozone concentration over time. It has been proposed to be between 1% and 0.5%.
- the generation of ozone gas is ozone generation based on the dissociation of oxygen molecules of R1 into oxygen atoms and the three-body collision of the oxygen atoms of R2 with oxygen molecules.
- the decomposition of the generated ozone is considered to include electron collision decomposition of R 3, thermal decomposition of R 4, decomposition of ozone by impurities of R 5, and the like.
- Ozone gas that can be taken out of the generator can be obtained in a balanced state of the above-mentioned reaction formulas R1 to R5. That is, ozone gas can be extracted by the following formula.
- Ozone that can be extracted (R 1 * R 2) — (R 3 + R.4 + R 5 + ⁇ )
- the ozone generated by the ozone generation mechanism described above is operated. If it has, to decrease ⁇ to ozone concentration, the following reaction occurs by applying a T i 0 2 is photocatalyst in addition or discharge electrode surface nitrogen gas to the raw material gas, over time the ozone concentration Is said to be prevented from dropping.
- the ozone concentration is relatively low, approximately 12.0 g. It is intended to stably obtain an ozone concentration of / m 3 .
- Japanese Patent Publication No. 6-21010 Japanese Patent No. 2641956 and Japanese Patent Publication No. 111-1210 were confirmed experimentally.
- the publications of the publications 110 and 110 and JP-A-11-111 cannot be demonstrated, and the addition of rare gases other than nitrogen (helium, neon, argon, xenon, etc.) has no effect. There was found.
- NO x gas component and nitric acid HN0 3
- trace oxygen with ozone gas NO x gas, taken out the ozonized gas in a state in which nitrate class evening are mixed. If this trace amount of nitric acid is contained in excess of several hundred ppm, chromium oxide and other deposits are deposited on the inner surface of the ozone gas outlet pipe stainless steel pipe with nitric acid, and metal impurities are contained in clean ozone gas.
- the concentration of ozone to be extracted is low, and the only way to extract a high concentration of 200 g / m 3 or more is to increase the nitrogen addition rate or decrease the gas flow rate.
- the method of increasing the nitrogen addition rate has a problem that the by-product gas due to NO x increases.
- N 2 gas is added in order to increase the generation efficiency of ozone gas, but N 2 gas is discharged by discharge in the generator.
- N 0 X converted to nitric acid cluster (vapor).
- the present invention has been made to solve the above-described problems, and provides an ozone generation apparatus and an ozone generation method that can accurately improve ozone generation efficiency without containing nitrogen gas or nitrogen by-products. Let's try. '
- Another object of the present invention is to provide an ozone generating apparatus and an ozone generating method for promoting an ozone generation reaction by containing a small amount of nitrogen gas in oxygen gas. Disclosure of the invention
- An ozone generating apparatus and an ozone generating method include a first electrode, a second electrode that forms a discharge region facing the first electrode, and a source gas that supplies oxygen gas as a source gas.
- An AC voltage is applied from a power source to the second electrode to inject discharge power into the discharge region, oxygen gas is supplied to the discharge region from the source gas supply means, and the catalytic substance is discharged.
- Irradiation of at least 420 nm or more is performed to excite the catalyst substance and dissociate the oxygen gas passing through the discharge region, and substantially reduce the gas pressure in the discharge region where the oxygen gas passes.
- 0.4 IMP a to approximately 0.4 MPa Attached handle oxygen gas is obtained so as to generate ozone gas. Therefore, according to the ozone generating apparatus and the ozone generating method of the present invention, the ozone generation efficiency can be accurately improved by using a source gas mainly composed of oxygen gas to which nitrogen gas is not added, and contains by-product substances such as Nx. Clean ozone gas can be obtained.
- the oxygen gas contains nitrogen gas to promote the ozone generation reaction.
- the ozone generation reaction can be promoted by allowing the oxygen gas to contain a trace amount of nitrogen gas, specifically, 1 Oppm to several 100 ppm.
- FIG. 1 is a block diagram showing a configuration of a gas system according to Embodiment 1 of the present invention.
- FIG. 2 is a block diagram showing a configuration in which an auxiliary raw material gas such as a rare gas is added to the gas system in Embodiment 1 in addition to oxygen gas.
- an auxiliary raw material gas such as a rare gas
- FIG. 3 is a characteristic diagram showing ozone concentration characteristics in the first embodiment.
- FIG. 4 is a schematic diagram showing the dissociation mechanism of oxygen molecules by the oxygen molecules and the photocatalyst in the first embodiment.
- FIG. 5 is a schematic diagram showing a mechanism of generating ozone by triple collision of oxygen atoms and oxygen molecules in the first embodiment.
- FIG. 6 is a schematic diagram showing a mechanism from oxygen gas to ozone generation in a cross section of the zonal generator according to the first embodiment.
- FIG. 7 is a diagram showing a distribution range and intensity of discharge light by a nitrogen gas or an oxygen gas with respect to an energy gap E (eV) and a wavelength of absorbed light; L (nm).
- FIG. 8 is a schematic sectional view illustrating an ozone generator used in Embodiment 2. It is.
- FIG. 9 is a schematic diagram showing the surface area of discharge light per unit dielectric electrode area in contact with a photocatalyst in the second embodiment.
- FIG. 10 is a characteristic diagram showing characteristics of a surface area where discharge light contacts a photocatalyst per unit dielectric electrode area and an ozone generation efficiency in the second embodiment.
- FIG. 11 is a schematic sectional view illustrating an ozone generator used in Embodiment 3.
- FIG. 12 is a schematic sectional view illustrating an ozone generator used in the fourth embodiment.
- FIG. 13 is a diagram showing a light transmittance characteristic of the ceramic plate according to the fourth embodiment with respect to a discharge light wavelength.
- FIG. 14 is a diagram showing characteristics of the ratio of the ozone generation efficiency to the content of the photocatalyst contained in the ceramic plate in the fourth embodiment.
- FIG. 15 is a schematic sectional view illustrating an ozone generator used in Embodiment 5.
- FIG. 16 is a diagram showing ozone concentration characteristics with respect to discharge power in the fifth embodiment.
- FIG. 17 is a configuration diagram of an ozone generator shown as a reference example.
- FIG. 18 is a characteristic diagram showing, as a reference example, the ozone concentration characteristics when nitrogen gas is added to high-purity oxygen gas.
- FIG. 19 is a characteristic diagram showing, as a reference example, the ozone concentration characteristics when a high-purity oxygen gas without using a photocatalytic substance and an auxiliary raw material gas such as a rare gas are added to the high-purity oxygen.
- FIG. 20 is a reference example, ozone generation efficiency vs. nitrogen addition rate? It is a figure which shows the characteristic of? (mg / J).
- FIG. 21 is a characteristic diagram showing a light wavelength and an energy absorption coefficient of oxygen molecules at which oxygen gas can be dissociated.
- FIG. 1 is a block diagram showing the configuration of the gas system in the first embodiment.
- FIG. 2 is a block diagram showing a configuration in which an auxiliary source gas such as a rare gas is added to the gas system in Embodiment 1 in addition to oxygen gas.
- FIG. 3 is a characteristic diagram showing ozone concentration characteristics in the first embodiment.
- FIG. 4 is a schematic diagram showing an oxygen molecule ( ⁇ dissociation mechanism) caused by an oxygen molecule and a photocatalyst in Embodiment 1.
- FIG. 5 is a three-body diagram of an oxygen atom and oxygen molecule in Embodiment 1. Fig.
- FIG. 6 is a schematic diagram showing a mechanism of ozone generation due to collision
- Fig. 6 is a schematic diagram showing a mechanism from oxygen gas to ozone generation in a cross section of an ozone generator according to Embodiment 1.
- the same reference numerals indicate the same or corresponding parts.
- Ozone generator of the present invention 2 0 0 g / m 3 or more high-concentration ozone gas, clean ozone gas such as a semiconductor manufacturing apparatus or a cleaning apparatus, ozone gas was no by-products such as N_ ⁇ x, or ozone generated It is effective where efficient equipment is required.
- the Class A raw material supply system 100 which supplies oxygen (raw material gas) with a purity of 99.99% or more, is composed of a high-purity oxygen cylinder 10, a pressure reducing valve 13, and an on-off valve 15. Be composed.
- the source gas 25 is supplied to the ozone generator 300 via a flow controller (MFC) 19 for adjusting the gas amount of the source gas.
- MFC flow controller
- Fig. 2 shows a type A material supply system that supplies oxygen (source gas).
- a Class B source supply system 200 that supplies a predetermined flow rate of auxiliary source gas such as a rare gas to enhance the emission intensity of discharge that does not contain nitrogen gas with a purity of 99.9% or more.
- Class B raw material supply system 200 is composed of high-purity argon cylinder 20, pressure reducing valve 21, and on-off valve 22, and supplies auxiliary raw material gas 25 b to oxygen gas 1 ⁇ about l OOOO p pm did.
- the raw material gas 25 is converted into an ozone generator 3 via a flow controller (MF C) 19 for adjusting the gas amount of the first raw material gas and a flow controller (MF C) 23 for adjusting the auxiliary raw gas amount. It is supplied to 00.
- MF C flow controller
- the structure is fixed.
- the ozone generator 300 is supplied with a source gas 25 from a type A source supply system, converts it into ozone gas 26, and converts it to an external source 600 via a pressure regulator (APC) 400. Output.
- APC pressure regulator
- the ozone generator 300 is supplied with oxygen gas 17 from the type A source supply system and a small amount of auxiliary gas 25 b of about 500 ppm from the type B source supply system.
- the ozone gas is converted to 26 and is output to an outside 600 through a pressure regulator (APC) 400.
- Auxiliary source gas which is a rare gas such as argon, xenon, or helium, enhances the emission intensity of discharge light to promote the ozone generation reaction.
- the ozone power supply 500 for generating ozone in the ozone generator 300 is mainly composed of a compressor section 501, an inverter section 502, and a transformer section 503.
- a high AC voltage is applied between the electrodes 310a and 301b of the ozone generator 300, and a dielectric is interposed between the electrodes. It is configured to generate silent discharge (dielectric barrier discharge).
- the strong discharge light with a light wavelength of 420 to 62 nm interacts with the photocatalyst to dissociate part of the oxygen gas of the raw material gas into oxygen atoms, thereby increasing the gas pressure in the reaction space. Maintaining a pressure of about 0.4MPa to about 0.4MPa, it promotes the bonding action between dissociated oxygen atoms and other oxygen molecules so that it can be converted to high-concentration ozone gas.
- the ozone generator 300 has a cooling means such as water for cooling the electrode which generates heat by electric discharge, but the cooling means is not shown here.
- the illustrated discharge cells are stacked in multiple stages so that gas passages can flow in parallel, so that a plurality of discharge cells are formed. It is configured to discharge.
- a type capable of cooling the double-sided electrode in the exemplary apparatus the gap length 0. lmm, injecting ozone generator is constituted by a discharge area of about 7 5 0 cm 2 to 3 0 0 and ozone supply up to about 2 0 0 0 W discharge power W.
- oxygen gas 17 having a purity of 99.9% or more, or a rare gas such as argon is added from the auxiliary source gas cylinder 20 in addition thereto. It was assumed.
- the ozone concentration characteristics were measured under the above conditions.
- Ozone gas with an ozone concentration C of more than 200 g / m 3 (9333 3 ppm) can be extracted at a discharge power of 2 kW and a raw material gas of 10 L / min.
- the amount of ozone generated Y (g / h) under the above conditions should be 120 g / h or more.
- the actual ozone yield X (g / k Wh) that can be extracted is It must be more than the specified value.
- the ozone yield X0 of the ozone generator itself is required to be at least 120 g / kWh.
- the ozone generation efficiency (mg / J ') is calculated as follows:
- This value is used as a permissible criterion for one unit, and is used as a selection criterion for the ozone generator and raw material gas.
- the condition where the ozone generation efficiency 7? Is 0.033 to 0.035 mg / J or more is as shown in Fig. 20.
- the nitrogen addition rate y was required to be about 1.5% or more.
- the implementation apparatus only high-purity raw gas without addition of nitrogen gas was supplied to the apparatus, and the ozone concentration characteristics shown by the curve connecting the measured points in FIG. 3 were obtained.
- the ozone generation efficiency in this case was 0.039 mg / J, and it was found that the ozone concentration equivalent to or higher than the ozone concentration characteristics when only nitrogen gas was added at 1% could be obtained.
- the ozone generation efficiency V was increased to obtain high-concentration ozone of 200 g / m 3 or more.
- Ki out Succoth to eliminate the NO x generation amount of N 2 0 5 or NO as discharge
- byproducts nitrate by binding to New Omicron chi and water (HN 0 3) class evening can be eliminated, gold by stainless metal surface and nitric acid such as ozone outlet pipe portion
- the generation amount of the genus impurities could be eliminated.
- ozone can be generated by the new ozone generation mechanism.
- the photocatalytic substance applied to the electrode surface absorbs the strong light of the discharge light, so that electrons are pumped from the valence band in the photocatalytic substance to the conduction band, and the photocatalytic substance itself is excited, and the excited photocatalyst is Holes are created in the valence band.
- the dissociation of the oxygen molecules is accelerated by the reaction between the electrons of the oxygen molecules and the holes of the photocatalyst (oxidation reaction of oxygen molecules), and the dissociated oxygen atoms and oxygen Ozone is generated by promoting the binding action with molecules.
- FIG. 4 shows the mechanism of dissociation of oxygen (molecule) gas
- FIG. 5 shows the mechanism of ozone generation from oxygen atoms and oxygen molecules
- the oxygen molecule has a continuous spectrum light absorption spectrum (ultraviolet wavelength of 130 to 200 nm) with a wavelength of ultraviolet light below 245 nm.
- a third substance (reaction formula R 2) causes ozone.
- Fig. 4 schematically shows the molecular structure of the photocatalyst and the dissociation mechanism of oxygen molecules during a silent discharge.
- the electrons that have moved to the conduction band have a very short life and are several tens of Psec. Holes in the valence band continue to exist as long as electrons transferred to the conduction band do not return by recombination, so the lifetime of the holes is as long as 200 to 300 nsec.
- the photocatalyst in the excited state where the holes exist and the oxygen molecules come into quantum contact ⁇ they take away the shared electrons of the oxygen molecules and physically dissociate the oxygen molecules (adsorption and dissociation of oxygen by the photocatalyst).
- the formula for the dissociation reaction of this oxygen molecule using a photocatalyst is as follows. There are the following two dissociation reactions to dissociate oxygen gas.
- the energy level band differs as shown in Table 1 in the band gap energy between the valence band and the conduction band (forbidden band).
- the band gap of alumina ceramic and quartz is 7.0 eV and 7.8 eV, respectively. Since the light absorption wavelength is in the vacuum ultraviolet light region of 177 nm or less or 159 nm or less, oxygen or oxygen and argon gas Cannot emit light at 177 nm and 159 nm with a silent discharge of
- the light absorption wavelength is ultraviolet light of 413 nm to 344 nm. Although it has the ability to emit (discharge) wavelengths, it has been found that the ability to emit light wavelengths in this ultraviolet region is weak with silent discharge of oxygen or oxygen and argon gas.
- the light absorption wavelength of a photocatalyst with a band gap of 2.0 eV to 2.9 eV is visible light with a wavelength of 428 nm to 62 nm, there is no voice of oxygen or oxygen and argon gas without nitrogen. Discharge has the ability (discharge) to emit light of this wavelength in the visible light range. Therefore, if a bandgap photocatalyst with a band gap of 2.0 eV to 2.9 eV is applied to the electrode surface (wall surface) of the ozone generator, nitrogen-free oxygen or the discharge light of oxygen and argon gas is absorbed.
- the photocatalyst was excited, and it was found that oxygen could be dissociated by the adsorption and dissociation of oxygen gas and the excited photocatalyst. Furthermore, it was found that ozone could be generated by promoting the binding action by the triple collision of dissociated oxygen atoms and oxygen molecules.
- the relationship between the band gap energy ⁇ energy gap E (eV) ⁇ of the photocatalyst and the wavelength ⁇ (nm) of the absorbed light is as follows. Wavelength of absorbed light ⁇ (nm) ⁇ 1 2 4 0 / E (eV) Energy gap E (6V) Wavelength of absorbed light (nm) 3.6 3 44
- FIG. 7 shows the distribution range and intensity of discharge light by nitrogen gas or oxygen gas with respect to the energy gap (eV) and the wavelength (nm) of absorbed light.
- the ozone generation efficiency ⁇ is high, a high concentration of ozone Was found to be obtained.
- the hole When the photocatalytic substance is photoexcited by electric discharge and a hole (hole) is formed in the valence band, the hole not only dissociates oxygen molecules due to the action of depriving electrons, but also dissipates the hole. Negative oxygen ions generated during For example, it also has the effect of removing electrons such as 0 2 2 —) and returning them to oxygen molecules. Therefore, by eliminating the negative oxygen ions, the impedance of the discharge can be further increased, and a higher electric field discharge field can be formed more than a high electric field discharge field formed by a short gap discharge. As a result, the intensity of the discharge light having higher energy is increased, the ozone generation efficiency TI is increased, and an effect of obtaining a high concentration of ozone is obtained.
- Fig. 5 shows the mechanism by which ozone is generated by the binding action between dissociated oxygen atoms and oxygen molecules.
- oxygen atoms In order for oxygen atoms to bond with oxygen molecules, simply by collision between oxygen atoms and oxygen molecules, energy cannot be transferred effectively, so that the binding action cannot be effectively promoted.
- a three-body collision with a third substance (M) such as a wall is necessary to transfer energy simultaneously with the collision between oxygen atoms and oxygen molecules as shown in Fig. 5. become.
- FIG. 6 is a schematic view showing a mechanism from an oxygen gas to ozone generation in a section of the ozone generator of the embodiment.
- a configuration in which two electrodes 310a and 301b, a dielectric 302 and a photocatalyst 303 applied to the dielectric surface It has become.
- the dielectrics 302 are provided on the opposing surfaces of both electrodes 3 O la and 301 b, respectively, and the photocatalysts 303 are applied to the opposing surfaces of both dielectrics 302 respectively.
- the discharge region (reaction space) between the two electrodes 301a and 301b is a very narrow slit space with a gap of about 0.1 mm.
- oxygen gas 25 which is a source gas
- an AC voltage of approximately several kV is applied between the two electrodes 301a and 301b, a uniform silent sound is generated over the entire discharge region. Discharge occurs and emits very strong discharge light.
- the adsorption and dissociation (quantum efficiency) between oxygen and the photocatalyst increases, and the ozone concentration increases.
- the gas pressure in the discharge region to 0.1 Mpa or more, the frequency of triple collisions between dissociated oxygen atoms and oxygen molecules increases, and the ozone concentration increases.
- the discharge gap d is reduced to about 0.1 mm, the discharge electric field intensity is increased, and as a result, high-energy discharge light can be obtained and light having a shorter wavelength can be emitted. Can be excited more efficiently, and the ozone concentration can be increased.
- the ozone generator according to Embodiment 1 is a source gas mainly containing oxygen not containing nitrogen, and is equivalent to a conventional ozone device to which nitrogen is added. Or higher ozone efficiency can be obtained, ozone gas (clean ozone) that is high in concentration and does not contain by-products such as NOx can be generated, and discharge power and discharge voltage are required to obtain the specified ozone. In addition, the current can be reduced, the ozone generator and the ozone power supply become compact, and the running cost is reduced.
- Embodiment 2 is a source gas mainly containing oxygen not containing nitrogen, and is equivalent to a conventional ozone device to which nitrogen is added. Or higher ozone efficiency can be obtained, ozone gas (clean ozone) that is high in concentration and does not contain by-products such as NOx can be generated, and discharge power and discharge voltage are required to obtain the specified ozone. In addition, the current can be reduced, the ozone generator and the ozone power supply become compact, and the
- FIG. 8 is a schematic cross-sectional view illustrating an ozone generator used in Embodiment 2.
- the configuration and method other than the specific configuration and method described here include the same configuration and method as the configuration and method in the first embodiment described above. It works.
- the photocatalyst 303 applied or sprayed on the surface of the dielectric 302 is in the form of a powder, and the particle diameter of the powder is approximately 0.1 / m to several tens of m, preferably about several m.
- a source gas 25 mainly containing oxygen not containing nitrogen is supplied to an ozone generator 300.
- Other configurations are the same as those in FIG. 1 in the first embodiment.
- the discharge region is formed by applying or spraying a few m of photocatalyst powder (powder of the photocatalyst substance of the first embodiment) on the discharge surface side of the dielectric 302 (or the electrode 301).
- the contact surface area between the discharge light emitted by the photocatalyst particles and the photocatalytic particles can be increased. Therefore, the dissociation action of oxygen molecules by the photocatalyst substance 303 is promoted, and ozone is efficiently generated, and high-concentration ozone is generated.
- FIG. 9 shows the calculation of the contact surface area between the discharge light and the photocatalyst 303 powder when the photocatalyst 303 powder was applied per unit dielectric electrode area.
- the photocatalyst 3 0 3 powder When the photocatalyst 3 0 3 powder is applied to the surface of the dielectric electrode of 1 cm 2 , the surface area exposed to the discharge light increases to about 4.14 cm 2 , When the photocatalyst powder is applied to both sides of the electrode or the dielectric as shown in FIG. 8, a surface area 8.28 times the area of the actual discharge surface can be obtained.
- the relationship between the contact surface area S between the photocatalyst and the discharge light on the unit dielectric electrode surface and the ozone generation efficiency is as shown in FIG. As the contact area S increases, the ozone generation efficiency 7) increases.
- the characteristic 901 is the characteristic when the photocatalyst is equal to or less than the band gap of 2.9 eV, and almost the same characteristic in the range of the band gap from 2.0 eV to 2.9 eV. Show.
- the characteristic 902 is the characteristic when the band gap of the photocatalyst is 3.2 eV or less
- the characteristic 903 is the characteristic when the band gap of the photocatalyst is 3.4 eV or less.
- the powder of the photocatalytic substance having a particle diameter of approximately 0.1 m to several tens m is fixed to the dielectric or the wall surface of the electrode in the discharge region.
- the surface area of the photocatalytic substance that is exposed to the discharge light is several times as large as the area, and the discharge light can be applied to the photocatalyst. Therefore, the action of dissociating oxygen molecules into oxygen atoms is promoted by the contact between the activated photocatalyst substance and oxygen gas, and the ozone generation efficiency can be accurately improved. As a result, a compact and inexpensive ozone generator can be realized.
- FIG. 11 is a schematic sectional view illustrating an ozone generator used in Embodiment 3.
- configurations and methods other than the specific configuration and method described here are the same as those in Embodiment 1 described above. It has the same configuration and method as the configuration and method of the present invention, and has the same effect. Irregularities of approximately 1 m to several tens of ⁇ m are formed on the surface of the dielectric electrode, and the photocatalyst powder (powder particle size is approximately 0.1 zm to several tens of ⁇ m) is applied to the surface of the dielectric electrode on which the irregularities are formed. Or sprayed.
- the discharge surface of the dielectric 302 (or the electrode 301) is made uneven, and the photocatalytic substance shown in the first embodiment is applied or sprayed on the dielectric electrode surface on which the unevenness is formed.
- This increases the contact surface area between the discharge light emitted in the discharge region and the photocatalyst particles, promotes the dissociation of oxygen molecules, efficiently generates ozone, and generates high-concentration ozone.
- the unevenness is formed only on one surface of the dielectric, and the photocatalytic substance is applied. However, if both the dielectric 302 and the electrodes 301 are formed, a higher concentration of ozone is generated. Ozone generation efficiency increases.
- FIG. 12 is a schematic sectional view illustrating an ozone generator used in the fourth embodiment.
- the configuration and method other than the specific configuration and method described here have the same configuration and method as the configuration and method in the first embodiment described above, and have the same operation.
- 0.725 mm thick ceramic double dielectric A powder (powder particle diameter of about 0.1 Aim to several tens of zm) of the photocatalyst substance of Embodiment 1 is dispersed and mixed in about 302 to about 10% by volume in 302.
- FIG. 13 is a view showing light transmittance characteristics with respect to light wavelength when the material of the dielectric material 302 is an alumina ceramic plate having a thickness of 0.725 mm.
- the alumina ceramic dielectric 302 transmits light of 300 nm to 100 nm emitted in the discharge region.
- the photocatalyst is excited by the transmitted discharge light and the photocatalyst, and it has been experimentally confirmed that the valence band holes and oxygen molecules of the excited photocatalyst are adsorbed and dissociated through the dielectric 302 to generate ozone. I was assured.
- FIG. 14 shows the experimental results of the volume content ratio and the ozone generation efficiency ratio of the photoconductor added to the dielectric 302 in the fourth embodiment. As a result, it was found that the ozone generation efficiency increased most when the content ratio of the photocatalyst powder to the dielectric medium was about 1% to about 10% by volume.
- the content ratio of the photocatalyst powder in the dielectric medium is set to 10% or more, the discharge light does not effectively hit the photocatalyst, and the apparent surface area where the discharge light hits is reduced, so that the ozone generation efficiency is interpreted to be reduced.
- the photocatalyst is not directly applied to the discharge surface but is applied through a dielectric medium that transmits light, there is an advantage that the photocatalyst is not damaged by the silent discharge. As a result, the life of the device is prolonged. Also, since the surface area of the photocatalyst can be increased, the ozone generation efficiency can be increased. In the fourth embodiment, the dielectric 3 0.2 A ceramic plate with a thickness of 0.725 mm was used as the medium.However, if a dielectric made of glass, such as Hide Ishi, is used, the discharge light can be more easily transmitted and the photocatalyst can be effectively excited. As a result, ozone efficiency can be improved. It is more effective to apply the second embodiment or the third embodiment to the dielectric containing the photocatalytic substance powder of the fourth embodiment.
- the dielectric in the discharge region is a dielectric through which discharge light is transmitted, and the dielectric through which discharge light is transmitted contains approximately 1% to approximately 10% by volume of photocatalyst powder
- the surface area of the photocatalyst contained in the substance which is exposed to the discharge light can be increased compared to the actual electrode area, and the photocatalyst can be exposed to the discharge light. Therefore, the action of dissociating oxygen molecules into oxygen atoms by the contact between the activated photocatalyst and oxygen gas is promoted, and the ozone generation efficiency can be more accurately improved. As a result, a compact and inexpensive ozone generator can be obtained, and the life of the device can be extended. Embodiment 5.
- FIG. 15 is a schematic sectional view illustrating an ozone generator used in Embodiment 5.
- the configuration and method other than the specific configuration and method described here include the same configuration and method as the configuration and method in the first embodiment described above. It works.
- a photocatalyst substance of several tens nm is applied or sprayed between two electrodes 310a and 301b and a ceramic dielectric 302 having a thickness of 0.725 mm.
- the 0.725 mm-thick ceramic dielectric 302 transmits the light of 300 nm to 100 nm emitted in the discharge region as shown in FIG.
- the photocatalyst is excited by the transmitted discharge light and the photocatalyst 303, and holes and oxygen molecules in the valence band of the excited photocatalyst are adsorbed and dissociated via the dielectric. It was experimentally confirmed that ozone was generated.
- the ozone generation efficiency was lower than in the first to third embodiments, but it was confirmed that the ozone generation efficiency was higher than the ozone generation amount characteristics of the electrode not coated with the photocatalyst.
- FIG. 16 shows the ozone concentration characteristics (1502) of the fifth embodiment and the ozone concentration characteristics (1501) of the conventional electrode.
- the photocatalyst since the photocatalyst is not applied directly to the discharge surface but is applied to the back side of the dielectric medium that transmits light, there is an advantage that the photocatalyst is not damaged by the silent discharge. As a result, the life of the device is prolonged. '
- a ceramic plate having a thickness of 0.725 mm is adopted as the dielectric 302, but if a dielectric made of glass such as quartz is used, the discharge light can be transmitted more.
- the photocatalyst can be effectively excited, and as a result, the ozone efficiency can be improved. It is more effective to apply the second, third, or fourth embodiment to the fixation of the photocatalyst covered with the dielectric of the fifth embodiment.
- the photocatalyst substance is provided on the electrode in the discharge region, and the discharge region side of the photocatalyst material is covered with the dielectric material that transmits the discharge light, so that the life is long and the ozone generation efficiency is improved, An ozone device for obtaining high-concentration ozone can be realized.
- Embodiment 6
- ozone is generated and reacted using oxygen gas to which nitrogen gas is not added or oxygen gas to which rare gas is added as a source gas, and clean ozone gas containing no by-products such as N NX is produced.
- a trace amount of nitrogen gas specifically 10 ppm to several 100 ppm (5 0 0 pm). Then, the ozone generation reaction was promoted, and it was confirmed that a high-concentration ozone increased by 5 to 10% was obtained. If nitrogen gas is added to such an extent, generation of by-products such as N NX will not be a problem.
- the discharge power W from the ozone power supply 500 was injected up to about 2000 W, and the ozone concentration characteristics when nitrogen was added to high-purity oxygen were thoroughly examined by experiments.
- Fig. 18 shows the discharge power of 1700 A when adding 0.1% nitrogen
- 1700 B when adding 0.1%
- 1700 C when adding 1%
- 5 shows the ozone concentration characteristics with respect to.
- the broken line 1700D shows the condition of the discharge power density of 0.25 W / cm 2 which is a low power density
- the broken line 1700E shows the condition of the discharge power density of 3 WZ cm 2 which is a high power density.
- Fig. 19 shows high purity oxygen gas only 2400 A and argon gas 2
- the ozone concentration characteristics with respect to the injected power when 400 C and xenon gas 2400 B are added are shown.
- ozone concentration 2 9 0 g / m 3 at 2 0 0 0 W obtained in the first 8 figure in the first 9 view, in any material gas, the 1 0 g / m 3 ozone Only the concentration was obtained, and adding argon gas or xenon gas alone had little effect on increasing the ozone concentration and the amount of generated ozone.
- argon and xenon gas are shown, but the same result was obtained with the addition of rare gases such as helium and neon.
- the dew point of the ozone generator is about -70 to -60, and the moisture contained in the source gas is 3 ⁇ ⁇ ! ⁇ 1 Op pm or more.
- the wavelength of the absorbed light for dissociating oxygen molecules is a continuous spectrum of ultraviolet light of 130 to 245 nm, and the excitation light of nitrogen gas is ultraviolet light of 300 to 400 nm. Yes, oxygen molecules cannot be directly photodissociated.
- Nitrogen dioxide N 0 2 and oxygen radicals in 3 0 0 nm ultraviolet light near by the excitation of nitrogen 0 (3 P) can be (reaction of R 6), produced oxygen atom 0 (3 p) oxygen molecules 0 ozone is generated by 2 and triple collision (reaction of R 2).
- Nitric oxide N ⁇ generated in the reaction results of the R 6 is a nitrogen N 0 2 dioxide is reproduced by reaction with H_ ⁇ 2 radicals generated by R 7 (reaction of R 8).
- the nitrogen dioxide N_ ⁇ 2: R 6 R 7 R 8 are the reaction cycle repeated playback of R 6 also simultaneously generates a time passing through the silent discharge region
- Oxygen atom 0 (P) is generated as an ozone gas by three-body collision (R 2) with oxygen molecule.
- nitrogen dioxide .nu.0 2 in the ultraviolet light near 3 00 nm by the discharge light and nitrogen discharge light such as argon, nitrogen N 0 2 dioxide ing the excited state N 0 2 * (of an H 1 response).
- Excited NO 2 * is dissociated into oxygen atoms (3 P) gives the dissociation energy considerable energy oxygen molecules into oxygen molecules, nitrogen itself dioxide is returned to N 0 2 in the ground state.
- Produced oxygen atom 0 (3 p) is the triple collision with oxygen molecules 0 2, the ozone is generated (reaction of R 2).
- Ground state N 0 2 discharges again Excited state N 0 2 * again due to ultraviolet light around 300 nm by light. That is, during the time that the feed gas passes through the silent discharge zone, nitrogen dioxide
- N 0 2 is reproduced repeatedly reaction cycle of HIH 2 H 1.
- the oxygen atoms 0 (3 P) generated at the same time to the time to pass through the silent discharge region ozone gas is generated by the triple collision with oxygen molecules (reaction of R 2).
- Ozone generated by the reaction of R 2 is decomposed by electron impact in the silent discharge region (reaction of R 3), decomposed by heat (reaction of R 4), and decomposed by impurities such as moisture and ⁇ ((reaction of R 5). )
- the ozone that can be extracted from the generator is ozone generation efficiency? ?
- the characteristic saturates as compared to.
- Ozone concentration that can be extracted (amount of ozone generated)-1 (amount of ozone decomposed)
- N 0 2 gas produced et Nitrogen gas or nitrogen gas has contributed to the ozone generator, was added (without a photocatalytic substance) high purity oxygen only with nitrogen gas Without it, ozone cannot be generated.
- the present invention is suitably applied to an ozone generation device and an ozone generation method.
Abstract
Description
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KR1020057013744A KR100756797B1 (ko) | 2004-02-25 | 2004-12-14 | 오존 발생 장치 및 오존 발생 방법 |
JP2006519306A JP4953814B2 (ja) | 2004-02-25 | 2004-12-14 | オゾン発生装置およびオゾン発生方法 |
EP04807008.0A EP1719735B1 (en) | 2004-02-25 | 2004-12-14 | Ozone generator and ozone generating method |
PCT/JP2004/018647 WO2005080263A1 (ja) | 2004-02-25 | 2004-12-14 | オゾン発生装置およびオゾン発生方法 |
EP10187763A EP2287114B1 (en) | 2004-02-25 | 2004-12-14 | Ozone generating method |
TW093139287A TWI263617B (en) | 2004-02-25 | 2004-12-17 | Ozone generator and ozone generation method |
JP2011001200A JP4932037B2 (ja) | 2004-02-25 | 2011-01-06 | オゾン発生装置およびオゾン発生方法 |
JP2011001198A JP5069800B2 (ja) | 2004-02-25 | 2011-01-06 | オゾン発生装置およびオゾン発生方法 |
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JP2011063512A (ja) | 2011-03-31 |
US7382087B2 (en) | 2008-06-03 |
KR20060012568A (ko) | 2006-02-08 |
EP1719735A4 (en) | 2009-11-11 |
JP2011063511A (ja) | 2011-03-31 |
TW200528390A (en) | 2005-09-01 |
TWI263617B (en) | 2006-10-11 |
EP1719735A1 (en) | 2006-11-08 |
JPWO2005080263A1 (ja) | 2008-01-10 |
KR100756797B1 (ko) | 2007-09-07 |
CN100364882C (zh) | 2008-01-30 |
EP1719735B1 (en) | 2015-09-02 |
JP2011098886A (ja) | 2011-05-19 |
EP2287114A3 (en) | 2011-03-02 |
EP2287114B1 (en) | 2012-08-29 |
JP2011088821A (ja) | 2011-05-06 |
JP5121944B2 (ja) | 2013-01-16 |
WO2005080263A1 (ja) | 2005-09-01 |
CN1774394A (zh) | 2006-05-17 |
JP4825314B2 (ja) | 2011-11-30 |
JP4953814B2 (ja) | 2012-06-13 |
TW200530120A (en) | 2005-09-16 |
EP2287114A2 (en) | 2011-02-23 |
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US20060049738A1 (en) | 2006-03-09 |
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