Ozone generation system and method for operating same

Patent metadata

Field	Value
Publication number	US-10544045-B2
Application number	US-201515503957-A
Country	US
Kind code	B2
Filing date	Jul 28, 2015
Priority date	Sep 22, 2014
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

In an ozone generating system in which an intermittent operation is performed, in which an ozone generating operation period in which ozone is generated by discharging gas which contains oxygen in a discharge space of an ozone generating apparatus and an ozone generating operation standby period in which gas is sealed in an ozone generating apparatus and discharge is stopped so as not to generate ozone are performed repeatedly, an absorbent which absorbs at least one of nitric acid and nitrogen oxide is provided in an ozone generating apparatus other than the discharge space.

First claim

The invention claimed is:

1. An ozone generating system comprising
an ozone generating apparatus having discharge electrodes which are arranged facing each other so as to form a discharge space,
a gas supplying device for supplying a material gas including oxygen to the ozone generating apparatus,
a cooling device for supplying cooling water for cooling the discharge electrodes,
a power supply for supplying electricity to the discharge electrodes for discharging and
a control unit for controlling the gas supplying device and the power supply,
wherein the control unit is configured to perform an intermittent operation, in which an ozone generating operation period in which ozone is generated by the ozone generating apparatus by supplying a material gas from the gas supplying device to the ozone generating apparatus and by supplying of electricity from the power supply to the discharge electrodes and an ozone generating operation standby period in which supplying of gas from the gas supplying device to the ozone generating apparatus and supplying of electricity from the power supply to the discharge electrodes is stopped are alternately repeated,
wherein the control unit is configured to seal the material gas in the ozone generating apparatus in the ozone generating operation standby period, and
an absorbent, which is configured to absorb at least one of nitric acid and nitrogen oxide is provided at a position which is in the ozone generating apparatus other than the discharge space and is contacted with the sealed material gas.

2. The ozone generating system according to claim 1 , wherein the control unit is configured to control gas pressure in the ozone generating apparatus in the ozone generating operation standby period to be higher than gas pressure in the ozone generating operation period.

3. The ozone generating system according to claim 1 , wherein each of the discharge electrodes comprises:
a ground electrode tube which is a metal tube having a circular section, and
a dielectric tube having a metal film formed in an inner wall which is provided in the ground electrode tube so as to have a predetermined gap between an outer wall of the dielectric tube and an inner wall of the ground electrode,
wherein a supplying side of the material gas of the dielectric tube is opened,
a side which is opposite to the supplying side of the material gas is closed, and
a diameter of the dielectric tube is 30 mm or less.

4. The ozone generating system according to claim 3 , wherein the absorbent is provided in the dielectric tube.

5. The ozone generating system according to claim 4 , wherein a micro through hole is provided at a wall surface which is opposite to the supplying side of the material gas of the dielectric tube.

6. The ozone generating system according to claim 1 , wherein the absorbent is provided in the ozone generating apparatus at a side which is closer to a supplying side of the material gas than the discharge space.

7. The ozone generating system according to claim 1 , wherein a plurality of the ozone generating apparatuses are provided, and the control unit is configured to control such that at least one of the ozone generating apparatus of the plurality of ozone generating apparatuses performs the intermittent operation.

8. The ozone generating system according to claim 1 , wherein the control unit controls such that in a part of the ozone generating operation standby period, a small quantity of the material gas is supplied to an ozone generating apparatus in the ozone generating operation standby period.

9. The ozone generating system according to claim 1 , wherein the material gas is dry air.

10. The ozone generating system according to claim 1 , wherein the material gas is oxygen gas which is generated by a Pressure Swing Adsorption type oxygen generating device or a Vacuum Pressure Swing Adsorption type oxygen generating device.

11. The ozone generating system according to claim 1 , wherein a distance between the discharge electrodes which are arranged facing each other is 0.1 mm or more and 0.6 mm or less.

12. The ozone generating system according to claim 1 , wherein the control unit is configured to control such that in a part of the ozone generating operation standby period, gas which is sealed in the ozone generating apparatus is circulated in the ozone generating apparatus in the ozone generating operation standby period.

13. An operation method of an ozone generating system comprising an ozone generating apparatus having discharge electrodes which are arranged facing each other so as to form a discharge space, a gas supplying device supplying a material gas including oxygen to the ozone generating apparatus, a cooling device supplying cooling water for cooling the discharge electrodes, a power supply supplying electricity to the discharge electrodes for discharging and a control unit which controls the gas supplying device and the power supply,
wherein the operation method of an ozone generating system comprises:
an ozone generating operation period in which the ozone generating apparatus generates ozone by supplying a material gas from the gas supplying device to the zone generating apparatus and by supplying electricity from the power supply to the discharge electrodes and
an ozone generating operation standby period in which supplying of gas from the gas supplying device to the ozone generating apparatus and supplying of electricity from the power supply to the discharge electrodes are stopped, gas pressure in the ozone generating apparatus is made to be higher than gas pressure in the ozone generating apparatus in the ozone generating operation period and the material gas is sealed in the ozone generating apparatus, and
in the ozone generating operation standby period, at least one of nitric acid and nitrogen oxide in the sealed material gas is absorbed by an absorbent, which is provided at a position which is contacted with the sealed material gas, which absorbs at least one of nitric acid and nitrogen oxide.

14. The operation method of an ozone generating system according to claim 13 , wherein the ozone generating system comprises a plurality of the ozone generating apparatuses, and at least one of the ozone generating apparatuses has the ozone generating operation standby period.

15. The operation method of an ozone generating system according to claim 13 , wherein the ozone generating operation standby period has a purge period in which purge gas is supplied to an ozone generating apparatus in the ozone generating operation standby period.

16. An ozone generating system, in which ozone is generated from a material gas to be outputted, comprising
a gas supplying device for supplying a material gas,
an ozone generating apparatus configured to have an ozone generating operation period in which an ozone is generated by using the material gas which is supplied by the gas supplying device and an ozone generating operation standby period in which an ozone is not generated,
a first valve through which the material gas, which is supplied by the gas supplying device, is introduced to the ozone generating apparatus,
a second valve through which the ozone, which is generated by the ozone generating apparatus, is outputted and
an absorbent, which is configured to absorb at least one of nitric acid and nitrogen oxide, which is provided in the ozone generating apparatus,
wherein in a case of the ozone generating operation period, the first valve and the second valve are opened, and the ozone is outputted from the second valve, and
in a case of the ozone generating op

Assignees

• Mitsubishi Electric Corp

Inventors

• Wada Noboru
• Nakagawa Yusuke

Classifications

• C01B2201/14

  Concentric/tubular dischargers · CPC title

• C01B2201/64

  Oxygen · CPC title

• C01B2201/76

  Water · CPC title

• C01B2201/30

  Dielectrics used in the electrical dischargers · CPC title

• H01J37/3438

  Electrodes other than cathode · CPC title