Burner and method for transient heating

Patent metadata

Field	Value
Publication number	US-12516809-B2
Application number	US-202217854782-A
Country	US
Kind code	B2
Filing date	Jun 30, 2022
Priority date	Jun 30, 2022
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

A burner including a first burner element having a first annular oxidant nozzle surrounding a first inner fuel nozzle; a second burner element having a second annular oxidant nozzle surrounding a second inner fuel nozzle, the second burner element being positioned adjacent to and spaced apart from the first burner element; a staging nozzle configured to flow secondary oxidant and being positioned adjacent to and spaced apart from the second burner element and separated from the first burner element by the second burner element; wherein the first inner nozzle and the second inner nozzle each have a major axis defined by a length L and a minor axis defined by a height hf; wherein 5<=L/hf<=15; wherein the staging nozzle has a major axis; and wherein the major axes of the first and second inner nozzles and the staging nozzle are substantially parallel with each other.

First claim

What is claimed is:

1 . A burner for transient heating of a furnace, the burner comprising:
a burner face configured to be positioned at an inner surface of the furnace when the burner is mounted in the furnace, the burner face defining a burner face plane; a first burner element having a first annular nozzle configured to flow primary oxidant surrounding a first inner nozzle configured to flow fuel; a second burner element having a second annular nozzle configured to flow primary oxidant surrounding a second inner nozzle configured to flow fuel, the second burner element being positioned adjacent to and spaced apart from the first burner element; a staging nozzle configured to flow secondary oxidant, the staging nozzle being positioned adjacent to and spaced apart from the second burner element, wherein the second burner element is positioned between the staging nozzle and the first burner element; wherein the first inner nozzle and the second inner nozzle each have a major axis defined by a major axis length L measured at the burner face plane, a minor axis defined by a minor axis height h f measured at the burner face plane, and a fuel nozzle aspect ratio of 5<=L/h f <=15; wherein the staging nozzle has a major axis defined by a major axis length X measured at the burner face plane and a minor axis defined by a minor axis height Y measured at the burner face plane; and
wherein the major axis of the first inner nozzle, the major axis of the second inner nozzle, and the major axis of the staging nozzle are substantially parallel with each other to within a deviation of less than or equal to 5°.

2 . The burner of claim 1 , wherein the staging nozzle has an aspect ratio of 10<=X/Y<=40.

3 . The burner of claim 1 , wherein 1<=X/L<=2.5.

4 . The burner of claim 1 ,
wherein the second burner element is spaced apart from the first burner element by a distance H 1 , wherein 2<=H 1 /h f <=20; and wherein the staging nozzle is spaced apart from the second burner element by distance H 2 , wherein 2<=H 2 /h f <=20.

5 . The burner of claim 1 ,
wherein the minor axis of the first inner nozzle is offset from the minor axis of the second inner nozzle by a distance B, wherein 0<B/L<=1.5; and wherein the minor axis of the first inner nozzle and the minor axis of the second inner nozzle are substantially parallel to each other to within a deviation of less than or equal to 5°.

6 . The burner of claim 1 , further comprising:
a pilot flame port positioned adjacent to and spaced apart from the first burner element by a distance of H 3 ; wherein the first burner element is positioned between the second burner element and the pilot flame port; and wherein 2<=H 3 /h f <=20.

7 . The burner of claim 1 , further comprising:
a first fuel conduit configured to supply fuel to the first inner nozzle, the first fuel conduit having a longitudinal axis aligned with a direction of fuel flow in the first fuel conduit, the longitudinal axis intersecting the burner face plane at an angle α with respect to perpendicular and at a complementary angle (90°−α) with respect to the major axis of the first inner nozzle; a second fuel conduit configured to supply fuel to the second inner nozzle, the second fuel conduit having a longitudinal axis aligned with a direction of fuel flow in the second fuel conduit, the longitudinal axis intersecting the burner face plane at an angle α with respect to perpendicular and at a complementary angle (90°−α) with respect to the major axis of the second inner nozzle; wherein longitudinal axis of the first fuel conduit and the longitudinal axis of the second fuel conduit are angled with respect to each other by an angle of 2α; and wherein 0<α<=20°.

8 . The burner of claim 7 , wherein 5°<α<=20°.

9 . The burner of claim 7 ,
wherein the longitudinal axis of the first fuel conduit intersects the plane defined by the major axis and the minor axis of the first inner nozzle at an angle β with respect to perpendicular and at a complementary angle (90°−β) with respect to the minor axis of the first inner nozzle; wherein the longitudinal axis of the second fuel conduit intersects the plane defined by the major axis and the minor axis of the second inner nozzle at an angle β with respect to perpendicular and at a complementary angle (90°−β) with respect to the minor axis of the second inner nozzle; wherein longitudinal axis of the first fuel conduit and the longitudinal axis of the second fuel conduit are each angled away from the staging nozzle; and wherein 0<β<=10°.

10 . The burner of claim 1 , further comprising:
a first fuel conduit configured to supply fuel to the first inner nozzle, the first fuel conduit having a longitudinal axis aligned with a direction of fuel flow in the first fuel conduit, the longitudinal axis intersecting the burner face plane at an angle β with respect to perpendicular and at a complementary angle (90°−β) with respect to the minor axis of the first inner nozzle; a second fuel conduit configured to supply fuel to the second inner nozzle, the second fuel conduit having a longitudinal axis aligned with a direction of fuel flow in the second fuel conduit, the longitudinal axis intersecting the burner face plane at an angle β with respect to perpendicular and at a complementary angle (90°−β) with respect to the minor axis of the second inner nozzle; wherein longitudinal axis of the first fuel conduit and the longitudinal axis of the second fuel conduit are each angled away from the staging nozzle; and wherein 0<β<=10°.

11 . The burner of claim 1 , wherein a total fuel flow and a total oxidant flow are provided to the burner in an equivalence ratio, wherein an equivalence ratio of 1 denotes a stoichiometric ratio of fuel to oxidant, an equivalence ratio of greater than 1 denotes a fuel-rich stoichiometry, and an equivalence ratio of less than 1 denotes a fuel-lean stoichiometry, the burner further comprising:
a controller programmed:
to independently control fuel flow to each of the first inner nozzle and the second inner nozzle; and
to control distribution of the total oxidant flow to consist of a primary oxidant flow apportioned between the first annular nozzle and the second annular nozzle and a secondary oxidant flow provided to the staging nozzle, wherein the primary oxidant flow is from 60% to 95% of the total oxidant flow.

12 . The burner of claim 11 , wherein the primary oxidant flow apportioned between the first annular nozzle and the second annular nozzle in a ratio from 0.9 to 1.1.

13 . The burner of claim 11 , wherein the controller is programmed to operate the burner in a proportional mode in which the total fuel flow is supplied to the first inner nozzle and the second inner nozzle such that the equivalence ratio of the first burner element is from 1.05 to 1.5 and the equivalence ratio of the second burner element is from 1.05 to 1.5.

14 . The burner of claim 11 , wherein the controller is programmed to operate the burner in an alternating mode in which apportionment of the total fuel flow between the first inner nozzle and the second inner nozzle switches back and forth between a first state in which the first burner element is active while the second burner element is passive and a second state in which the first burner element is passive while the first burner element is active;
wherein an active burner element is characterized by an equivalence ratio from 1.4 to 3 and a passive burner element is characterized by an equivalence ratio from 0.1 to 1.

15 . The burner of claim 14 , wherein the controller is programmed to switch

Assignees

• Air Prod & Chem

Inventors

• Makwana Anandkumar
• Sane Anup Vasant
• Buzinski Michael David
• He Xiaoyi

Classifications

• F23N1/02

  conjointly with air supply · CPC title

• F23L9/06

  by discharging the air into the fire bed · CPC title

• F23D23/00

  Assemblies of two or more burners (gas burners with provision for a retention flame F23D14/26) · CPC title

• F23D14/22

  with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other · CPC title

• F23D99/004

  for use in particular heating operations · CPC title