Emission abatement assembly having a mixing baffle and associated method
First Claim
Patent Images
1. An emission abatement assembly comprising:
- a particulate filter, anda fuel-fired burner positioned upstream of the particulate filter, the fuel fired burner comprising;
a housing having an exhaust gas inlet port,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 combustion flow which is advanced through the combustion chamber of the fuel-fired burner, and a bypass flow which is bypassed around the combustion chamber of the fuel-fired burner,a flame catch associated with the shroud and positioned downstream of the combustion chamber, anda mixing baffle positioned downstream of the flame catch and upstream of the particulate filter, the mixing baffle being configured to mix the combustion flow and the bypass flow, and wherein the mixing baffle includes a collector plate fixed to the housing downstream of the flame catch and a diverter plate fixed to the collector plate, and wherein the combustion flow and bypass flow are directed toward upstream faces of the collector and diverter plates upon exiting the shroud and combustion chamber.
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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.
87 Citations
22 Claims
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1. An emission abatement assembly comprising:
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a particulate filter, and a fuel-fired burner positioned upstream of the particulate filter, the fuel fired burner comprising; a housing having an exhaust gas inlet port, 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 combustion flow which is advanced through the combustion chamber of the fuel-fired burner, and a bypass flow which is bypassed around the combustion chamber of the fuel-fired burner, a flame catch associated with the shroud and positioned downstream of the combustion chamber, and a mixing baffle positioned downstream of the flame catch and upstream of the particulate filter, the mixing baffle being configured to mix the combustion flow and the bypass flow, and wherein the mixing baffle includes a collector plate fixed to the housing downstream of the flame catch and a diverter plate fixed to the collector plate, and wherein the combustion flow and bypass flow are directed toward upstream faces of the collector and diverter plates upon exiting the shroud and combustion chamber. - View Dependent Claims (2, 3)
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4. An emission abatement assembly comprising:
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a particulate filter, and a fuel-fired burner positioned upstream of the particulate filter, the fuel fired burner comprising; a housing having an exhaust gas inlet port, 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 combustion flow which is advanced through the combustion chamber of the fuel-fired burner, and a bypass flow which is bypassed around the combustion chamber of the fuel-fired burner, and wherein the combustion chamber includes a plurality of inlet openings through which a portion of the exhaust gas enters the combustion chamber to provide a hot combustion flow, and wherein the shroud includes a plurality of openings through which a remaining portion of the exhaust gas is bypassed around the combustion chamber to provide a cold bypass flow, and a mixing baffle including a collector plate and diverter plate 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, and wherein the mixing baffle includes a perforated annular ring having an upstream end attached to the collector plate and a downstream end attached to the diverter plate such that the hot combustion flow and cold bypass flow are advanced toward the collector plate upon exiting the shroud and the combustion chamber. - View Dependent Claims (5, 6, 7, 8, 9)
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10. An emission abatement assembly comprising:
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a particulate filter, and a fuel-fired burner positioned upstream of the particulate filter, the fuel fired burner comprising; a housing having an exhaust gas inlet port, 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 combustion flow which is advanced through the combustion chamber of the fuel-fired burner, and a bypass flow which is bypassed around the combustion chamber of the fuel-fired burner, and a mixing baffle including a collector plate and diverter plate 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 wherein; the collector plate has a hole defined therein, the diverter plate is positioned downstream of the hole 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. - View Dependent Claims (11, 12)
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13. 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 a collector plate having a hole defined therein, a perforated ring secured to the collector plate, and a diverter plate secured to the perforated ring, wherein the mixing baffle 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.
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17. A method of operating a fuel-fired burner of an emission abatement assembly, the method comprising the steps of:
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advancing a flow of exhaust gas into a housing of the fuel-fired burner, separating the flow of exhaust gas into a combustion flow which is advanced through a combustion chamber of the fuel-fired burner, and a bypass flow which is bypassed around the combustion chamber of the fuel-fired burner, and further including advancing a portion of the exhaust gas through a plurality of inlet openings in the combustion chamber to provide a hot combustion flow, bypassing a remaining portion of the exhaust gas around the combustion chamber and through a plurality of openings formed in a shroud to provide a cold bypass flow, and directing the combustion flow and the bypass flow radially outwardly with a flow mixer located downstream of the combustion chamber, and further including advancing the combustion flow and bypass flow toward the flow mixer, wherein the flow mixer comprises a collector plate attached to the housing of the fuel-fired burner, a perforated annular ring having an upstream end secured to the collector plate, and a diverter plate secured to a downstream end of the perforated annular ring. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification