Method for generating ozone

Patent metadata

Field	Value
Publication number	US-9902616-B2
Application number	US-201615158997-A
Country	US
Kind code	B2
Filing date	May 19, 2016
Priority date	Jan 24, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

An ozone generator includes one or more electrode pairs each containing two electrodes arranged at a distance of a predetermined gap length and a power source for applying an alternating-current voltage between the two electrodes. In the ozone generator, ozone is produced when a source gas flows at least between the two electrodes and a discharge is generated between the two electrodes. The ozone generator has a discharge space formed between the two electrodes, and the ozone generator satisfies the condition of 0.5<V/f/L wherein V (m/s) represents a flow velocity of the source gas flowing through the discharge space, f (Hz) represents a frequency of the alternating-current voltage, and L (m) represents a length of the discharge space in the main flow direction of the source gas.

First claim

The invention claimed is:

1. A method for generating ozone, comprising:
flowing at least a portion of a source gas at least through a discharge space between a first electrode and a second electrode; and
applying an alternating-current voltage between the first electrode and the second electrode,
a value of V/f/L is greater than 0.5, wherein V (m/s) represents a flow velocity of the source gas flowing through the discharge space, f (Hz) represents a frequency of the alternating-current voltage, and L (m) represents a length of the discharge space in a main flow direction of the source gas.

2. A method as recited in claim 1 , wherein the value of V/f/L is greater than 1.

3. A method as recited in claim 1 , wherein the value of V/f/L is less than 50.

4. A method as recited in claim 1 , wherein the value of V/f/L is less than 20.

5. A method as recited in claim 1 , wherein the first and second electrodes are arranged at a gap length of a distance which is at least 0.2 mm and not greater than 0.5 mm.

6. A method as recited in claim 1 , wherein the source gas is an atmospheric air.

7. A method as recited in claim 1 , wherein each of the first and second electrodes comprises a tubular dielectric body having a hollow portion and a conductive body disposed in the hollow portion.

8. A method as recited in claim 1 , wherein:
the method comprises flowing the source gas through a plurality of pairs of electrodes arranged in parallel, in series, or in parallel and series, and
some of the source gas passes through a non-discharge space on a gas passage plane, the gas passage plane having a normal direction parallel to the main flow direction of the source gas.

9. A method as recited in claim 1 , wherein a flow rate of the source gas flowing through the discharge space is 380 L/min or less.

10. A method as recited in claim 5 , wherein each of the first and second electrodes comprises a tubular dielectric body having a hollow portion and a conductive body disposed in the hollow portion.

11. A method as recited in claim 10 , wherein the dielectric body of the first electrode faces the dielectric body of the second electrode.

12. A method as recited in claim 1 , wherein each of the first and second electrodes comprises a conductive body and a dielectric body that covers an entire periphery of the conductive body.

13. A method as recited in claim 1 , wherein the first and second electrodes are arranged at a gap length of a distance which is less than 1.0 mm.

14. A method as recited in claim 1 , wherein the source gas has an absolute humidity in the range of from 0 g/m 3 to about 50 g/m 3 .

Assignees

• Ngk Insulators Ltd

Inventors

• Kondo Yoshimasa
• Yokoi Shoji
• Terazawa Tatsuya
• Takase Naoya

Classifications

• C01B2201/32

  Constructional details of the dielectrics · CPC title

• C01B2201/10

  Dischargers used for production of ozone · CPC title

• C01B13/11 Primary

  by electric discharge · CPC title

• C01B2201/62

  Air · CPC title

• C01B2201/40

  using several dischargers in series · CPC title