Optimization and structure of gas jet diffusion flames in venturi-cascade burners

Conference · Wed Apr 01 04:00:00 EST 1998

OSTI ID:585443

Qubbaj, A R ^[1]

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1. Univ. of Oklahoma, Norman, OK (United States)

An experimental study to control the pollutant emissions (CO, NO and soot) of diffusion flames by modifying the air infusion rate into the flame is presented. The modification was achieved by installing a cascade of venturis around a burning gas jet. A propane jet diffusion flame at burner-exit Reynolds D number of 5100 was examined with different venturi sizes and spacing distributions. Temperature and the concentrations of CO{sub 2}, CO and NO in the exhaust products were measured before and after the modification and the optimal conditions were obtained. The optimal venturi diameter was between D/d=27.5 and D/d=35, where d is the burner-exit diameter and D is the venturi throat diameter. The optimal arrangement was the equal spacing configuration in which the venturis were distributed at equal intervals over the flame length The venturi-cascading technique at its optimal conditions compared to the baseline case resulted in the following: (i) CO and NO emission indices decreased by 87% and 33% respectively; (ii) the average volumetric soot concentration decreased by 24%; and (vi) radiant fraction of heat release decreased by 10%.

• Research Organization: Coal and Slurry Technology Association, Washington, DC (United States)
• OSTI ID: 585443
• Report Number(s): CONF-980309--PROC.
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
AIR POLLUTION CONTROL
BURNERS
COAL
DIFFUSION
FLAMES
NITRIC OXIDE
PROPANE
SOOT