Electrodynamic combustion control with current limiting electrical element

Patent metadata

Field	Value
Publication number	US-10359189-B2
Application number	US-201615351269-A
Country	US
Kind code	B2
Filing date	Nov 14, 2016
Priority date	Sep 10, 2012
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

An charge element disposed proximate to a combustion reaction is caused to carry a voltage while also being prevented from arc-discharging or arc-charging to or from the combustion reaction, by a current limiting element in electrical continuity with the charge element.

First claim

What is claimed is:

1. A combustion system, comprising:
a charge element configured to be disposed proximate to a combustion reaction, the charge element including a plurality of electrode elements;
an electrical node configured for electrical continuity with the charge element; and
a plurality of current-limiting elements disposed to convey the electrical continuity from the electrical node respectively to the plurality of electrode elements and to limit current flow therebetween;
wherein the plurality of current limiting elements are configured to collectively conduct, between the electrical node and the plurality of electrode elements, a total electrical current that is greater than an amount of current carried by an electrical arc, and to individually limit current in each of the electrodes to less than an amount of current carried by an electrical arc;
whereby maintaining electrical coupling between the combustion reaction and the plurality of electrode elements prevents an electrical arc from forming between the combustion reaction and the plurality of electrode elements.

2. The combustion system of claim 1 , further comprising:
a fuel nozzle configured to provide fuel to the combustion reaction.

3. The combustion system of claim 1 , further comprising:
a heat transfer surface configured to receive heat from the combustion reaction.

4. The combustion system of claim 3 , further comprising:
a propulsion system, a chemical process, or an electrical generation system operatively coupled to the heat transfer surface.

5. The combustion system of claim 1 , wherein the charge element is configured to apply an electric field to the combustion reaction.

6. The combustion system of claim 1 , wherein the charge element is a corona electrode configured to eject charged ions.

7. The combustion system of claim 1 , wherein the charge element is configured to provide a path between voltage ground and the combustion reaction, the system further comprising a second charge element configured to apply electrical energy to the combustion reaction.

8. The combustion system of claim 1 , wherein the charge element includes a plurality of electrode segments of a combustion support surface; and
wherein the current limiting element includes a corresponding plurality of current limiting elements, each configured to conduct electrical current between a respective one of the plurality of electrode segments and the electrical node.

9. The combustion system of claim 1 , wherein the current limiting element includes a linear current limiting element.

10. The combustion system of claim 1 , wherein the current limiting element includes an electrical resistor.

11. The combustion system of claim 1 , wherein the current limiting electrical element includes a nonlinear current limiting element.

12. The combustion system of claim 1 , wherein the electrical element includes a switch.

13. The combustion system of claim 12 , wherein the switch includes a transistor.

14. The combustion system of claim 1 , wherein the charge element and current limiting element are integrated and are formed, at least in part, of a semiconductor material.

15. The combustion system of claim 1 , further comprising:
a power supply configured to drive the electrical node.

16. The combustion system of claim 15 , wherein the current limiting element 108 is integrated with the power supply.

17. A method for electrically interacting with a combustion reaction, comprising:
supporting a plurality of charge elements or plurality of electrode segments proximate to or in contact with a combustion reaction;
coupling the plurality of charge elements or plurality of electrode segments to an electrical node through a corresponding respective plurality of current limiting elements;
configuring the plurality of current limiting elements to collectively conduct, between the electrical node and the plurality of charge elements or the plurality of electrode segments, a total electrical current that is greater than an amount of current carried by an electrical arc, and to individually limit current in every charge element or electrode segment to less than an amount of current carried by an electrical arc;
applying electricity to at least one of the combustion reaction or the electrical node; and
maintaining electrical coupling between the combustion reaction and the plurality of charge elements or plurality of electrode segments while the plurality of current limiting elements prevent an electrical arc from forming between the combustion reaction and the plurality of charge elements or plurality of electrode segments.

18. The method for electrically interacting with a combustion reaction of claim 17 , wherein the at least one charge element is serrated and further includes an electrode body and a plurality of projections coupled to or intrinsic to the electrode body, each of the plurality of projections being shaped to cause corona ejection of ions responsive to the applied electricity.

19. The method for electrically interacting with a combustion reaction of claim 17 , further comprising
positioning the plurality of charge elements or electrode segments circumferentially around a space occupied by the combustion reaction.

20. The method for electrically interacting with a combustion reaction of claim 19 , wherein the current limiting elements include at least one resistor.

21. The method for electrically interacting with a combustion reaction of claim 19 , wherein the current limiting elements include at least one switch, the switch is coupled to a respective channel current sensor, and all switches are controlled by a total current sensor.

22. The method for electrically interacting with a combustion reaction of claim 21 , comprising limiting current to an amperage substantially equal to a current measured by the total current sensor divided by the number of current limiting elements.

23. The method for electrically interacting with a combustion reaction of claim 17 , further comprising positioning, shaping, and configuring the plurality of charge elements or electrode segments around a space occupied by the combustion reaction such that the plurality of charge elements or electrode segments act as a flame anchor and provide an electrical path for a counter-charge to the combustion reaction.

Assignees

• Clearsign Comb Corp

Inventors

• Krichtafovitch Igor A
• Wiklof Christopher A

Classifications

• F23Q7/18

  with built-in generator · CPC title

• F23Q3/008

  Structurally associated with fluid-fuel burners · CPC title

• F23Q3/00

  Igniters using electrically-produced sparks (sparking-plugs H01T13/00) · CPC title

• F02P7/00

  Arrangements of distributors, circuit-makers or -breakers, {e.g. of distributor and circuit-breaker combinations} or pick-up devices (advancing or retarding ignition or control therefor F02P5/00; such devices per se, see the relevant classes of Section H, e.g. rotary switches H01H19/00, contact-breakers, distributors H01R39/00, generators H02K) · CPC title

• F23C99/001 Primary

  Applying electric means or magnetism to combustion (for combustion engines F02B51/04, F02M27/04) · CPC title