Burner system including a non-planar perforated flame holder

Patent metadata

Field	Value
Publication number	US-10119704-B2
Application number	US-201615236862-A
Country	US
Kind code	B2
Filing date	Aug 15, 2016
Priority date	Feb 14, 2013
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

A combustion system such as a furnace or boiler includes a non-planar perforated flame holder configured to hold a combustion reaction.

First claim

What is claimed is:

1. A non-planar perforated flame holder, comprising:
an input face configured to receive a fuel-air mixture;
an output face configured to emit products of a combustion reaction of the fuel-air mixture; and
a non-planar flame holder body having a plurality of perforations extending from the input face to the output face and collectively configured to promote the combustion reaction of the fuel-air mixture within the perforations;
wherein when the non-planar perforated flame holder is operably positioned a distance from a fuel nozzle, a central area of the non-planar flame holder body is configured to be further displaced from the fuel nozzle than a perimeter area of the non-planar flame holder body to equalize tensile load through the non-planar flame holder body.

2. The non-planar perforated flame holder of claim 1 , wherein the non-planar flame holder body is arcuate.

3. The non-planar perforated flame holder of claim 2 , wherein the non-planar flame holder body is a catenary arch.

4. The non-planar perforated flame holder of claim 2 , wherein the non-planar flame holder body is parabolic.

5. The non-planar perforated flame holder of claim 2 , wherein the non-planar flame holder body is rotationally symmetric.

6. The non-planar perforated flame holder of claim 1 , wherein the non-planar flame holder body is a stepped arch.

7. The non-planar perforated flame holder of claim 1 , wherein the input face is non-planar and is configured to equalize flow of the fuel-air mixture into the plurality of perforations.

8. The non-planar perforated flame holder of claim 1 , wherein the non-planar flame holder body is arcuate and includes a departure angle that is at least 15 degrees, wherein the departure angle defines an angular displacement of an end of the non-planar flame holder body from a center of the non-planar flame holder body, wherein the departure angle is measured from a plane that is perpendicular to a longitudinal axis of the center of the non-planar flame holder body.

9. The non-planar perforated flame holder of claim 8 , wherein the non-planar flame holder body is arcuate and includes a departure angle that is at least 30 degrees.

10. The non-planar perforated flame holder of claim 8 , wherein the non-planar flame holder body is arcuate and includes a departure angle that is at least 45 degrees.

11. The non-planar perforated flame holder of claim 1 , wherein the non-planar flame holder body is a single continuous unit.

12. The non-planar perforated flame holder of claim 1 , wherein the non-planar flame holder body includes a plurality of sections that are coupled together to operate as a singular unit.

13. The non-planar perforated flame holder of claim 12 , wherein the plurality of sections are coupled together with adhesive.

14. The non-planar perforated flame holder of claim 12 , wherein the plurality of sections are held in place with pure compression.

15. The non-planar perforated flame holder of claim 12 , wherein the plurality of sections are tiles that include at least one of a ceramic material and a cementatious material.

16. The non-planar perforated flame holder of claim 12 , wherein the plurality of sections are cubical, rectangular, triangular, hexagonal, otherwise polygonal, or asymmetric so that the sections naturally fit closely together.

17. The non-planar perforated flame holder of claim 1 , wherein the non-planar flame holder body is formed from a ceramic material.

18. The non-planar perforated flame holder of claim 1 , wherein the non-planar flame holder body is formed from a cementatious material.

19. The non-planar perforated flame holder of claim 1 , wherein the input face is concavely arched to increase view factors between the plurality of perforations to enable thermal radiation exchange between the plurality of perforations.

20. The non-planar perforated flame holder of claim 19 , wherein enabling thermal radiation exchange between the plurality of perforations in the input face facilitates maintenance of an operating temperature of the non-planar perforated flame holder.

21. The non-planar perforated flame holder of claim 1 , wherein the output face is concavely arched to enable thermal radiation exchange between the plurality of perforations.

22. The non-planar perforated flame holder of claim 21 , wherein enabling thermal radiation exchange between the plurality of perforations in the output face facilitates maintenance of an operating temperature of the non-planar perforated flame holder.

23. The non-planar perforated flame holder of claim 1 , wherein the output face is convexly arched to facilitate thermal radiation of one or more fluid systems that are positioned proximate to a periphery of the non-planar flame holder body.

24. The non-planar perforated flame holder of claim 1 , wherein the input face is configured to receive the fuel-air mixture from a position external to all chords defined by the input face.

25. The non-planar perforated flame holder of claim 24 , wherein at least one of the perforations is configured to receive the fuel-air mixture with a trajectory substantially parallel to at least one sidewall of the at least one of the perforations.

26. A combustion system, comprising:
a fuel and oxidant source configured to output a fuel and oxidant mixture; and
a non-planar perforated flame holder positioned downstream from the fuel and oxidant source to receive the fuel and oxidant mixture and configured to hold a combustion reaction supported by the fuel and oxidant mixture, the non-planar perforated flame holder, including:
a non-planar input face configured to receive the fuel and oxidant mixture;
an output face configured to output products of a combustion reaction of the fuel and oxidant mixture; and
a perforated flame holder body defining a plurality of perforations extending from the input face to the output face, the perforations being collectively configured to hold the combustion reaction;

wherein when the non-planar perforated flame holder is operably positioned a distance from the fuel and oxidant source, a central area of the perforated flame holder body is configured to be further displaced from the fuel and oxidant source than a perimeter area of the perforated flame holder body to reduce variation of a flow rate of the fuel and oxidant mixture across the input face.

27. The combustion system of claim 26 , wherein the combustion system is a portion of a boiler system.

28. The combustion system of claim 26 , wherein the non-planar input face is configured to equalize flow of the fuel and oxidant mixture into the plurality of perforations.

29. The combustion system of claim 26 , wherein the perforated flame holder body is arcuate.

30. The combustion system of claim 29 , wherein the perforated flame holder body is a catenary arch.

31. The combustion system of claim 29 , wherein the perforated flame holder body is parabolic.

32. The combustion system of claim 29 , wherein the perforated flame holder body is rotationally symmetric.

33. The combustion system of claim 29 , wherein the perforated flame holder body is a stepped arch.

34. The combustion system of claim 26 , wherein the perforated flame holder body is non-planar to equalize tensile load.

Assignees

• Clearsign Comb Corp

Inventors

• Colannino Joseph
• Karkow Douglas W
• Dansie James K
• Wiklof Christopher A

Classifications

• F23D2203/104

  Grids, e.g. honeycomb grids · CPC title

• F23D2203/1017

  curved · CPC title

• F23D2203/102

  using perforated plates · CPC title

• F23D2212/103

  Fibres · CPC title

• F23D14/14 Primary

  using screens or perforated plates · CPC title