Compact flame-curtain burner

Patent metadata

Field	Value
Publication number	US-12455074-B2
Application number	US-202017442929-A
Country	US
Kind code	B2
Filing date	Jan 23, 2020
Priority date	Mar 26, 2019
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

Post-mix burner and use of same for generating a flame curtain, the burner having a longitudinal central dividing wall ( 5 ) terminating in a wall head ( 7 ) towards the burner top ( 4 ), an oxidant inlet compartment ( 102 ) and an oxidant outlet compartment ( 103 ) on a first side of the central wall ( 5 ), a fuel inlet compartment ( 202 ) and a fuel outlet compartment on the opposite side of the central wall ( 5 ); the wall head ( 7 ) presenting a first set of oxidant outlet passages ( 107 ) and a second set of fuel outlet passages ( 207 ) terminating respectively in first oxidant ejection openings ( 100 ) and second fuel ejection openings ( 200 ) in an ejection surface ( 10 ) at the burner top ( 4 ), the oxidant and fuel ejection openings ( 100, 200 ) each extending in the longitudinal direction along the ejection surface ( 10 ).

First claim

The invention claimed is:

1. A post-mix burner extending between a burner bottom and a burner top and in a longitudinal direction between a first burner end and a second burner end, the burner comprising:
a central dividing wall extending from the burner bottom to the burner top and, in the longitudinal direction, from the first burner end to the second burner end, the central dividing wall comprising, towards the burner top, a wall head extending in the longitudinal direction and terminating in an ejection surface at the burner top;
a first inlet compartment adjacent the burner bottom on a first side of the central dividing wall and a second inlet compartment adjacent the burner bottom on a second side of the central dividing wall opposite the first side;
a first outlet compartment adjacent the burner top on the first side of the central dividing wall and a second outlet compartment adjacent the burner top on the second side of the central dividing wall, the first inlet compartment being separated from the first outlet compartment by a first separation plate extending from the central dividing wall on the first side thereof and the second inlet compartment being separated from the second outlet compartment by a second separation plate extending from the central dividing wall on the second side thereof;
a first fluid inlet leading into the first inlet compartment and adapted for the supply of a first fluid into the first inlet compartment from outside the burner and a second fluid inlet leading into the second inlet compartment and adapted for the supply of a second fluid into the second inlet compartment from outside the burner;
whereby
the first separation plate presents a first set of multiple first through passages fluidly connecting the first inlet compartment to the first outlet compartment, said first set of first through passages extending in the longitudinal direction;
the second separation plate presents a second set of multiple second through passages fluidly connecting the second inlet compartment to the second outlet compartment, said second set of second through passages extending in the longitudinal direction;
the wall head presents a first set of first outlet passages and a second set of second outlet passages terminating respectively in first ejection openings and second ejection openings in the ejection surface, the first outlet passages fluidly connecting the first outlet compartment to an area downstream of the burner top and the second outlet passages fluidly connecting the second outlet compartment to said downstream area, the first and second ejection openings each extending in the longitudinal direction in the ejection surface;
whereby the first and second separation plates, and the first and second sets of through passages, are configured to provide substantially uniform longitudinal flow distribution of the first and second fluids, respectively, prior to ejection from the election openings.

2. The burner according to claim 1 , whereby the first inlet compartment has a volume which is greater than the volume of the first outlet compartment and/or whereby the second inlet compartment has a volume which is greater than the volume of the second outlet compartment.

3. The burner according to claim 1 , whereby the first set of first through passages comprises multiple spaced apart rows of first through passages, said rows of first through passages extending in the longitudinal direction and/or whereby the second set of second through passages comprises multiple spaced apart rows of second through passages, said rows of second through passages extending in the longitudinal direction.

4. The burner according to claim 1 , whereby the first ejection openings in the ejection surface extend in one or more than one first rows in the longitudinal direction, whereby the second ejection openings in the ejection surface extend in one or more second rows in the longitudinal direction and whereby the outermost rows are both first rows.

5. The burner according to claim 4 ,
whereby the first set of first outlet passages comprises multiple fork-shaped first subsets of first outlet passages, each first subset being located in a plane perpendicular to the longitudinal direction,
whereby the second set of second outlet passages comprises multiple fork-shaped second subsets of second outlet passages, each second subset being located in a plane perpendicular to the longitudinal direction,
the first and second subsets together defining in the longitudinal direction a row of alternating first and second subsets.

6. The burner according to claim 1 , whereby the first ejection openings and the second ejection openings together form one or more rows in the longitudinal direction, whereby, in each of said one or more rows, first ejection openings alternate with second ejection openings.

7. The burner according to claim 6 ,
whereby the first set of first outlet passages comprises multiple fork-shaped first subsets of first outlet passages, each first subset being located in a plane forming a non-zero angle Θ with the longitudinal direction, and
whereby the second set of second outlet passages comprises multiple fork-shaped second subsets of second outlet passages, each second subset being located in a plane forming said non-zero angle Θ with the longitudinal direction,
the first and second subsets together defining a row of alternating first and second subsets in the longitudinal direction.

8. The burner according to claim 7 , whereby 30°<Θ<60°.

9. The burner according to claim 1 , further comprising two lips protruding outwardly from the burner top towards the downstream area and extending in the longitudinal direction on either side of the first and second ejection openings in the ejection surface.

10. The burner according to claim 1 , whereby the first fluid inlet is fluidly connected to a source of a gaseous combustion oxidant and whereby the second fluid inlet is fluidly connected to a source of a gaseous fuel.

11. The burner according to claim 10 , whereby the gaseous combustion oxidant contains at between 50% vol and 100% vol oxygen and/or whereby the gaseous fuel is selected from natural gas, propane, propylene, acetylene, hydrogen and mixtures of at least two of said gaseous fuels.

12. A combustion method by means of a burner according to claim 1 ,
whereby the gaseous combustion oxidant is supplied to the first fluid inlet so that the gaseous combustion oxidant flows from the first fluid inlet into the first inlet compartment and from the first inlet compartment via the first through passages into the first outlet compartment and from the first outlet compartment via the first outlet passages and the first ejection openings into the downstream area,
whereby the gaseous fuel is supplied to the second fluid inlet so that the gaseous fuel flows from the second fluid inlet into the second inlet compartment and from the second inlet compartment via the second through passages into the second outlet compartment and from the second outlet compartment via the second outlet passages and the second ejection openings into the downstream area, and
whereby the gaseous fuel is combusted with the gaseous combustion oxidant in downstream area in the form of a flame curtain extending in the longitudinal direction.

13. The combustion method according to claim 12 , whereby gaseous fuel is ejected into the downstream area with a gaseous fuel injection velocity and the gaseous combustion oxidant is ejected into the downstream area with an oxidant injection velocity and whereby the ratio between the gaseous fuel injection velocity and the oxidant injection velocity is

Assignees

• Air Liquide

Inventors

• Poynot Philippe
• Cadalen Sébastien
• Gourlaouen Vincent
• Ravet Romain
• Vandendriessche Rémy
• Paubel Xavier

Classifications

• F23D2203/102

  using perforated plates · CPC title

• F23D14/84

  Flame spreading or otherwise shaping (F23D14/70 takes precedence) · CPC title

• F23D14/32

  using a mixture of gaseous fuel and pure oxygen or oxygen-enriched air (F23D14/38 takes precedence) · CPC title

• F23D2900/14641

  with gas distribution manifolds or bars provided with a plurality of nozzles · CPC title

• F23D2900/00003

  Fuel or fuel-air mixtures flow distribution devices upstream of the outlet · CPC title