Method for controlling an ozone generator

Patent metadata

Field	Value
Publication number	US-11225410-B2
Application number	US-201716462642-A
Country	US
Kind code	B2
Filing date	Oct 13, 2017
Priority date	Dec 7, 2016
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

A method for controlling an ozone generator with a high-voltage electrode, at least one counter electrode, and a gap in which at least one dielectric is arranged and which is perfused by an oxygen-containing gas having a particle density ngas. The high-voltage electrode and the at least one counter electrode are provided with a connection for an electrical voltage supply for generating silent discharges in at least one discharge gap. Striking distances d of the discharge are distributed between a minimum striking distance dmin and a maximum striking distance dmax. For the generation of an ozone concentration >12 wt. % ozone, the voltage amplitude U0 of an AC voltage on the electrical voltage supply is selected so that U0<130*10−21 V*m2*ngas*dmax*(CDL+Cg)/CDL, with CDL=capacitance of the dielectric and Cg=capacitance of the discharge gap.

First claim

The invention claimed is:

1. A method for controlling an ozone generator with a high-voltage electrode and at least one counter electrode, wherein the high-voltage electrode and the at least one counter electrode delimit a gap in which at least one dielectric is arranged and which is perfused by an oxygen-containing gas having a particle density n gas , and wherein the high-voltage electrode and the at least one counter electrode include a connection for an electrical voltage supply for generating silent discharges in at least one discharge gap, and wherein striking distances d of the discharge are distributed between a minimum striking distance d min and a maximum striking distance d max , said method comprising the steps of:
(a) generating an ozone concentration having greater than 12 weight % ozone in the oxygen-containing gas using a voltage amplitude U 0 of an AC voltage on the electrical voltage supply such that for the particle density n gas , a capacitance of the dielectric C DL and a capacitance of the discharge gap C g , wherein V*m 2 denotes units expressed in volt*meter 2 :
U 0 <130*10 −21 V *m 2 *n gas *d max *( C DL +C g )/ C DL

and,
(b) controlling the ozone generator to achieve a first ozone concentration by using a first voltage amplitude, and to achieve a second ozone concentration by using a second voltage amplitude, the second ozone concentration higher than the first ozone concentration, and the second voltage amplitude lower than the first voltage amplitude.

2. The method according to claim 1 , wherein:
U 0 <120*10 −21 V *m 2 *n gas *d max *( C DL +C g )/ C DL .

3. The method according to claim 1 , wherein:
U 0 <110*10 −21 V *m 2 *n gas *d max *( C DL +C g )/ C DL .

4. The method according to claim 1 , wherein:
U 0 <100*10 −21 V *m 2 *n gas *d max *( C DL +C g )/ C DL .

5. The method according to claim 1 , wherein for the ozone concentration to be generated of greater than 18 wt. % ozone in the oxygen-containing gas, the voltage amplitude U 0 is selected so that:
U 0 <100*10 −21 V *m 2 *n gas *d max *( C DL +C g )/ C DL .

6. The method according to claim 1 , wherein:
U 0 <90*10 −21 V *m 2 *n gas *d max *( C DL +C g )/ C DL .

7. The method according to claim 1 , wherein the high-voltage electrode is a profiled electrode.

8. The method according to claim 1 , wherein the striking distances d min to d max are distributed continuously and stochastically.

9. The method according to claim 1 , wherein the ozone generator has a single counter electrode and the dielectric is arranged in contact with the counter electrode.

10. The method according to claim 1 , wherein the high-voltage electrode and the at least one counter electrode are plates and form a plate ozone generator.

11. The method according to claim 1 , further comprising generating more ozone gas per volume of the oxygen-containing gas at a same electrical power by varying a frequency of the voltage during operation of the ozone generator.

12. The method according to claim 1 , further comprising regulating ozone generation rate by varying the particle density and a frequency of the voltage.

13. The method according to claim 1 , wherein the striking distances d min to d max are distributed continuously and periodically.

14. The method according to claim 1 , wherein the striking distances d min to d max are distributed in a longitudinal direction of the electrode.

15. The method according to claim 14 , wherein the striking distances d min to d max are distributed in a circumferential direction of the electrode.

16. The method according to claim 1 , wherein the striking distances d min to d max are distributed in a circumferential direction of the electrode.

17. A method for controlling an ozone generator with a high-voltage electrode and at least one counter electrode, wherein the high-voltage electrode and the at least one counter electrode delimit a gap in which at least one dielectric is arranged and which is perfused by an oxygen-containing gas having a particle density n gas , and wherein the high-voltage electrode and the at least one counter electrode include a connection for an electrical voltage supply for generating silent discharges in at least one discharge gap, and wherein striking distances d of the discharge are distributed in a distribution between a minimum striking distance d min and a maximum striking distance d max , said method comprising the steps of:
(a) generating an ozone concentration having greater than 12 weight % ozone in the oxygen-containing gas using a voltage amplitude U 0 of an AC voltage on the electrical voltage supply such that for the particle density n gas , a capacitance of the dielectric C DL and a capacitance of the discharge gap C g , wherein V*m 2 denotes units expressed in volt*meter 2 :
U 0 <130*10 −21 V *m 2 *n gas *d max *( C DL +C g )/ C DL

wherein the distribution of the striking distances from d min to d max is formed by a fabric made of wire.

18. The method according to claim 17 , wherein the at least one counter electrode and the high-voltage electrode are tubular and concentrically aligned with each other, and the fabric is a round hollow cord.

Assignees

• Xylem Europe Gmbh

Inventors

• Fiekens Ralf
• Fietzek Reiner
• Salvermoser Manfred
• Brüggemann Nicole

Classifications

• C01B13/11 Primary

  by electric discharge · CPC title

• C01B2201/12

  Plate-type dischargers · CPC title

• C01B2201/90

  Control of the process · CPC title

• C01B2201/22

  Constructional details of the electrodes · CPC title

• C01B2201/64

  Oxygen · CPC title