EMISSION ABATEMENT ASSEMBLY HAVING A MIXING BAFFLE AND ASSOCIATED METHOD

• US 20080307780A1
• Filed: 06/13/2007
• Published: 12/18/2008
• Est. Priority Date: 06/13/2007
• Status: Active Grant

• Current Assignee: Faurecia Emissions Control Technologies USA LLC (Forvia SE)
• Original Assignee: Faurecia Emissions Control Technologies USA LLC (Forvia SE)
• Inventors: Khadiya, Navin, Crawley, Wilbur H., Abel, John B., Nohl, John P., Iverson, Robert J., Morgan, Geoff
• Granted Patent: US 8,789,363 B2
• Time in Patent Office: Days
• US Class Current: 60/311
• CPC Class Codes: F01N 2240/14 a fuel burner
• CPC Class Codes: F01N 2240/20 a flow director or deflector
• CPC Class Codes: F01N 3/025 using fuel burner or by adding fuel to exhaust

Abstract

An emission abatement assembly includes a fuel-fired burner having a combustion chamber and a particulate filter positioned downstream of the fuel-fired burner. A mixing baffle is positioned between the fuel-fired burner and the particulate filter.

Claims

1. An emission abatement assembly comprising:

a particulate filter, and

a fuel-fired burner positioned upstream of the particulate filter, the fuel-fired burner comprising;

(i) a housing having an exhaust gas inlet port,

(ii) a combustion chamber having a shroud secured thereto, the combustion chamber and the shroud cooperate to separate a flow of exhaust gas entering the housing through the exhaust gas inlet port into (a) a combustion flow which is advanced through the combustion chamber of the fuel-fired burner, and (b) a bypass flow which is bypassed around the combustion chamber of the fuel-fired burner, and

(iii) a mixing baffle positioned downstream of the combustion chamber and upstream of the particulate filter, the mixing baffle being configured to mix the combustion flow and the bypass flow.

2. The emission abatement assembly of claim 1, wherein:

the mixing baffle comprises a collector plate having a hole defined therein, and

a diverter plate positioned downstream of the hole.

3. The emission abatement assembly of claim 2, wherein:

the mixing baffle further comprises a perforated ring surrounding the hole,

a first end of the perforated ring is secured to the collector plate, and

a second end of the perforated ring is secured to the diverter plate.

4. The emission abatement assembly of claim 3, wherein the mixing baffle is configured such that the combustion flow and bypass flow are at least partially mixed when said flows are directed radially outwardly through the perforated ring by contact with the diverter plate.

5. The emission abatement assembly of claim 4, wherein the diverter plate is domed.

6. An emission abatement assembly,

a fuel-fired burner having a combustion chamber,

a particulate filter positioned downstream of the fuel-fired burner, and

a mixing baffle comprising (i) a collector plate having a hole defined therein, (ii) a perforated ring secured to the collector plate, and (iii) a diverter plate secured to the perforated ring, wherein the mixing plate is positioned between the fuel-fired burner and the particulate filter such that both a flow of exhaust gas advancing through the combustion chamber and a flow of exhaust gas bypassing the combustion chamber are advanced through the hole in the collector plate.

7. The emission abatement assembly of claim 6, wherein the perforated ring surrounds the hole of the collector plate.

8. The emission abatement assembly of claim 6, wherein:

the fuel-fired burner comprises a combustion chamber, and

the mixing baffle is positioned to mix gas exiting the combustion chamber with gas bypassing the combustion chamber.

9. 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,

separating the flow of exhaust gas into (i) a combustion flow which is advanced through a combustion chamber of the fuel-fired burner, and (ii) a bypass flow which is bypassed around the combustion chamber of the fuel-fired burner, and

directing the combustion flow and the bypass flow radially outwardly with a flow mixer located downstream of the combustion chamber.

10. The method of claim 9, wherein the directing step comprises advancing the combustion flow and the bypass flow through a hole defined in a collector plate.

11. The method of claim 9, wherein the directing step comprises advancing the combustion flow and the bypass flow through a hole defined in a collector plate and into contact with a diverter plate.

12. The method of claim 11, wherein the directing step comprises advancing the combustion flow and the bypass flow through a hole defined in a collector plate, into contact with a diverter plate, and radially outwardly from the diverter plate through a perforated ring.