Low maintenance on-site generator

• US 7,922,890 B2
• Filed: 11/28/2007
• Issued: 04/12/2011
• Est. Priority Date: 11/28/2006
• Status: Active Grant

• Current Assignee: De Nora Holdings US, Inc. (Industrie De Nora S.p.A)
• Original Assignee: Miox Corporation (Industrie De Nora S.p.A)
• Inventors: Sanchez, Justin, Herrington, Rodney E.
• Primary Examiner(s): Bell; Bruce F
• Application Number:
  US11/946,772
• Publication Number:
  US 20080237054A1
• Time in Patent Office: 1,231 Days
• Field of Search: 205/335, 205/345, 205/346, 205/349, 205/508, 205/620, 205/687, 204/242, 204/252, 204/263, 204/275.1, 204/228.3, 204/228.6, 204/229.6
• US Class Current: 205/346
• CPC Class Codes: C25B 15/02 Process control or regulation
• CPC Class Codes: C25B 15/08 Supplying or removing reactants or electrolytes; Regeneration of electrolytes

Abstract

Method and apparatus for a low maintenance, high reliability on-site electrolytic generator incorporating automatic cell monitoring for contaminant film buildup, as well as automatically removing or cleaning the contaminant film. This method and apparatus preferably does not require human intervention to clean.

Claims

1. A method for operating an electrolytic cell, the method comprising the steps of:

supplying brine to an electrolytic cell;

producing one or more oxidants in the electrolytic cell;

automatically cleaning the electrolytic cell, thereby reducing contaminants in the electrolytic cell; and

subsequently automatically continuing to produce the one or more oxidants.

2. The method of claim 1 wherein the cleaning step comprises:

providing brine to an acid generating electrolytic cell;

generating an acid in the acid generating electrolytic cell; and

introducing the acid from the acid generating electrolytic cell into the electrolytic cell.

3. The method of claim 2 wherein the acid comprises muriatic acid or hydrochloric acid.

4. The method of claim 1 further comprising the step of diluting the brine.

5. The method of claim 1 wherein the detecting step comprises utilizing a carbonate detector.

6. The method of claim 1 wherein the detecting step comprises measuring a rate of brine consumption in the electrolytic cell.

7. The method of claim 6 comprising measuring a quantity selected from the group consisting of flow meter output, temperature of the electrolytic cell, brine pump velocity, and incoming water flow rate.

8. The method of claim 6 further comprising comparing the rate of brine consumption to a rate of brine consumption in a clean electrolytic cell.

9. The method of claim 1 wherein the cleaning step comprises using an ultrasonic device and/or using a magnetically actuated mechanical electrode cleaning device.

10. The method of claim 1 wherein the cleaning step comprises reversing a polarity of electrodes in the electrolytic cell, thereby lowering the pH at a cathode.

11. The method of claim 1 further comprising:

detecting a level of contaminant buildup; and

automatically stopping the brine supply after an upper contaminant threshold is detected.

12. The method of claim 11 wherein the step of subsequently automatically continuing to produce the one or more oxidants is performed after a lower contaminant threshold is detected.

13. The method of claim 1 wherein the cleaning step is performed periodically.

14. An apparatus for producing an oxidant, the apparatus comprising:

a brine supply;

an electrolytic cell;

an acid supply; and

a control system for automatically introducing acid from said acid supply into said electrolytic cell, thereby cleaning said electrolytic cell.

15. The apparatus of claim 14 wherein said acid supply comprises a second electrolytic cell.

16. The apparatus of claim 15 wherein said brine supply provides brine to said second electrolytic cell during a cleaning cycle.

17. The apparatus of claim 14 further comprising a variable speed brine pump.

18. The apparatus of claim 14 further comprising a carbonate detector.

19. The apparatus of claim 14 further comprising one or more thermowells for measuring a temperature of said electrolytic cell.

20. The apparatus of claim 14 further comprising one or more flowmeters for measuring a brine flow rate.

21. An apparatus for producing an oxidant, the apparatus comprising:

a brine supply;

an electrolytic cell;

a cleaning mechanism in said electrolytic cell; and

a control system for automatically activating said cleaning mechanism.

22. The apparatus of claim 21 wherein said cleaning mechanism is selected from the group consisting of ultrasonic horn, magnetically actuated electrode mechanical cleaning device, and acidic solution at a cathode surface.

23. The apparatus of claim 21 further comprising a device selected from the group consisting of a carbonate detector, at least one thermowell for measuring a temperature of said electrolytic cell, and a flowmeter for measuring a brine flow rate.