Method and apparatus for directing exhaust gas through a fuel-fired burner of an emission abatement assembly

• US 20050150211A1
• Filed: 08/31/2004
• Published: 07/14/2005
• Est. Priority Date: 01/13/2004
• Status: Active Grant

• Current Assignee: ET US Holdings LLC (Forvia SE)
• Original Assignee: ET US Holdings LLC (Forvia SE)
• Inventors: Pearson, David, Farr, Shoja, Johnson, Randall J., Crawley, Wilbur H., Birkby, Nicholas, Kong, Yougen, Abel, John B.
• Granted Patent: US 8,641,411 B2
• Time in Patent Office: Days
• US Class Current: 60/282
• CPC Class Codes: F01N 3/0256 the fuel being ignited by electrical means

Abstract

A method of operating an emission abatement assembly includes separating the exhaust gas flow entering through the gas inlet port of the fuel-fired burner into a combustion flow which is advanced through the combustion chamber, and a bypass flow which bypasses the combustion chamber. An emission abatement assembly is also disclosed.

Claims

1. A method of operating a fuel-fired burner of an emission abatement assembly, the method comprising the steps of:

advancing a flow of exhaust gas into a housing of the fuel-fired burner, and

separating the flow of exhaust gas into (i) a combustion flow which is advanced through a combustion chamber of the fuel-fired burner, (ii) a bypass flow which is bypassed around the combustion chamber of the fuel-fired burner, wherein the combustion flow is about 70% or less of the flow of exhaust gas.

2. The method of claim 1, wherein the combustion flow is about 50%-70% of the flow of exhaust gas.

3. The method of claim 1, wherein the combustion flow is about 50% or less of the flow of exhaust gas.

4. The method of claim 1, wherein the separating step comprises advancing the flow of exhaust gas into contact with a diverter plate.

5. The method of claim 1, wherein:

the combustion chamber comprises an annular wall having (i) a first wall half which faces away from an exhaust gas inlet port of the housing, and (ii) a second, opposite wall half which faces toward the exhaust gas inlet port of the housing,

the first wall half has a number of gas inlet openings defined therein,

the second wall half is substantially devoid of openings, and

the separating step comprises impinging the flow of exhaust gas onto the second wall half.

6. The method of claim 1, wherein:

the combustion chamber comprises an annular wall having (i) a first wall half which faces away from an exhaust gas inlet port of the housing, and (ii) a second, opposite wall half which faces toward the exhaust gas inlet port of the housing,

the first wall half has a first number of gas inlet openings which collectively define a first void area,

the second wall half has a second number of gas inlet openings which collectively define a second void area,

the second void area is less than the first void area, and

the separating step comprises impinging the flow of exhaust gas onto the second wall half.

7. A fuel-fired burner of an emission abatement assembly, the fuel-fired burner comprising:

a housing having an exhaust gas inlet port, and

a combustion chamber positioned in the housing, the combustion chamber comprising an outer wall having (i) a first wall half which faces away from an exhaust gas inlet port of the housing, and (ii) a second, opposite wall half which faces toward the exhaust gas inlet port of the housing,

wherein (i) the first wall half has a first number of gas inlet openings which collectively define a first void area, (ii) the second wall half has a second number of gas inlet openings which collectively define a second void area, and (iii) the second void area is less than the first void area.

8. The fuel-fired burner of claim 7, wherein the second wall half is substantially devoid of gas inlet openings.

9. The fuel-fired burner of claim 7, further comprising an electrode having an end which extends into the combustion chamber.

10. The fuel-fired burner of claim 7, further comprising a fuel nozzle configured to introduce fuel into the combustion chamber.

11. A fuel-fired burner of an emission abatement assembly, the fuel-fired burner comprising:

a housing having an exhaust gas inlet port,

a combustion chamber positioned in the housing, and

means for separating a flow of exhaust gas entering the housing through the exhaust gas inlet port into (i) a combustion flow which is advanced through the combustion chamber of the fuel-fired burner, (ii) a bypass flow which is bypassed around the combustion chamber of the fuel-fired burner, wherein the combustion flow is about 70% or less of the flow of exhaust gas.

12. The fuel-fired burner of claim 11, wherein the combustion flow is about 50%-70% of the flow of exhaust gas.

13. The fuel-fired burner of claim 11, wherein the combustion flow is about 50% or less of the flow of exhaust gas.

14. The fuel-fired burner of claim 11, wherein the means for separating the flow of exhaust gas comprises a diverter plate.

15. The fuel-fired burner of claim 14, wherein the diverter plate is positioned between the gas inlet port and the combustion chamber.

16. The fuel-fired burner of claim 11, wherein:

the combustion chamber comprises an outer wall, and

the means for separating the flow of exhaust gas comprises a portion of the outer wall.

17. The fuel-fired burner of claim 11, wherein:

the combustion chamber comprises an outer wall, and

the means for separating the flow of exhaust gas comprises a portion of the outer wall which faces the gas inlet port.

18. The fuel-fired burner of claim 11, wherein:

the combustion chamber comprises an outer wall, and

the means for separating the flow of exhaust gas comprises a portion of the outer wall which is substantially devoid of openings.