Research on combustion processes relevant to burners in hvac systems. Annual report, July 1, 1991-June 30, 1992
An experimental investigation of the application of noncircular fuel nozzles and primary-air venturis in the inshot burners of residential natural gas heating systems is presented. Experiments were conducted in a laboratory combustion chamber and a full-scale furnace from an HVAC unit. The effects of using noncircular geometries for fuel-nozzles and venturi-inlets on primary-air entrainment have been studied. Emission indices of NOx, NO, and CO of the burners fitted with elliptic and rectangular nozzles and elliptic primary-air venturi inlets are compared with the emission indices of a standard burner having a circular nozzle and a circular venturi inlet. An increase up to 30% in primary air entrainment, a decrease up to 20% in the NOx emission index, and a decrease up to 40% in the CO emission index were noted when noncircular nozzles and venturis were used in a standard burner. The results do not show a systematic dependence on variables such as aspect ratio, primary-air port area, and venturi mounting height. The emission indices measured in the full-scale furnace with a standard burner agree well with the previously reported results. Further testing in a full-scale furnace is in progress.
- Research Organization:
- Oklahoma Univ., Norman, OK (United States). School of Aerospace, Mechanical and Nuclear Engineering
- OSTI ID:
- 7132464
- Report Number(s):
- PB-93-114668/XAB; CNN: GRI-5091-260-2178
- Country of Publication:
- United States
- Language:
- English
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Application of noncircular primary-air inlet geometries in the inshot burners of residential gas furnaces
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Related Subjects
42 ENGINEERING
GAS BURNERS
NOZZLES
EFFICIENCY
CARBON MONOXIDE
COMBUSTION
COMBUSTION PRODUCTS
NITROGEN OXIDES
VENTURI TUBES
BURNERS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
THERMOCHEMICAL PROCESSES
034000* - Natural Gas- Combustion
421000 - Engineering- Combustion Systems