Low NO[sub x] aspirated burner apparatus
A low NO[sub x] emission, fuel-fired heating appliance is described comprising: a heat exchanger structure through which hot combustion products may be internally flowed and then discharged therefrom, the heat exchanger structure having an inlet and an outlet and being operative to transfer combustion heat to a fluid flowed externally across the heat exchanger structure; wall means, for defining at least one combustion passage having an inlet end portion for receiving a burning, sub stoichiometric fuel/air mixture, and an outlet end portion communicated with the inlet of the heat exchanger structure; burner means for flowing into the inlet end portion of the combustion passage a burning, sub stoichiometric fuel/air mixture, including a flame having a flame temperature, that partially combust within an upstream portion of the combustion passage; air injection means for injecting a flow of aspirating air into the combustion passage, in a manner cooling the partially combusted, burning fuel/air mixture and forcing the cooled, partially combusted burning fuel/air mixture through the combustion passage toward the outlet end portion thereof, the air injection means including an aspirating fan having an outlet communicated with the interior of each of the combustion passage, and an inlet for receiving ambient air; catalytic converter means, associated with the combustion passage and entirely positioned downstream form the entry point therein of the flow of aspirating air, for intercepting and essentially completing the combustion burning fuel/air mixture as it approaches the inlet of the heat exchanger structure; and means for flowing a fluid to be heated externally across the heat exchanger structure and the wall means to thereby transfer combustion heat to the fluid from both the heat exchanger structure and the wall means and further cool to a substantial degree the partially combusted burning fuel/air mixture internally traversing the combustion passage.
- Assignee:
- Rheem Manufacturing Co., New York, NY (United States)
- Patent Number(s):
- US 5222476; A
- Application Number:
- PPN: US 7-889175
- OSTI ID:
- 6206326
- Country of Publication:
- United States
- Language:
- English
Similar Records
High efficiency water heating system
High efficiency water heating system