Flame tube parametric studies for control of fuel bound nitrogen using rich-lean two-stage combustion

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5656389

Shultz, D F; Wolfbrandt, G

A flame tube was used in experimental parametric studies of two-stage, rich-lean combustion to evaluate techniques for minimizing the conversion of fuel-bound nitrogen to nitric oxides in a premixed, homogeneous combustion system. Air at 670/sup 0/K and 0.48 MPa was premixed with fuel blends of propane, toluene, and pyridine, then burned at primary equivalence ratios of 0.5 to 2.0 and secondary equivalence ratios of 0.5 to 0.7. These fuel mixtures were proportioned to yield hydrogen compositions of 9.0 to 18.3 wt % and fuel nitrogen compositions of 0 to 1.5 wt %. Two distillates of a coal syncrude produced by the SRC-II process also were tested for NO/sub x/ emissions and the results compared with the propane-toluene-pyridine data. In addition to oxides of nitrogen, the exhaust gas was sampled for carbon monoxide, carbon dioxide, unburned hydrocarbons, and smoke. Rich-lean two-stage combustion was successful in reducing the conversion rate of fuel-bound nitrogen. Rates of less than 10% were observed for the optimum primary equivalence ratios, which ranged between 1.4 and 1.73 with a secondary equivalence ratio of 0.5. Fuel hydrogen and nitrogen content both influenced the values at which the optimum primary equivalence ratio occurred. The amount of fuel-bound nitrogen also affected conversion rate, since the conversion rate dropped as fuel nitrogen content increased. Exhaust NO/sub x/ levels, however, still increased with additional fuel nitrogen.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• DOE Contract Number: EF-77-A-01-2593
• OSTI ID: 5656389
• Report Number(s): DOE/NASA/2593-80/15; NASA-TM-81472; CONF-800408-2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
AEROSOLS
AIR POLLUTION ABATEMENT
ALKANES
AROMATICS
AZINES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION YIELD
COAL LIQUEFACTION
COAL LIQUIDS
COLLOIDS
COMBUSTION PRODUCTS
DISPERSIONS
DISTILLATES
ENERGY SOURCES
EXHAUST GASES
FOSSIL FUELS
FUELS
GASEOUS WASTES
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
LIQUEFACTION
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM DISTILLATES
PETROLEUM FRACTIONS
POLLUTION ABATEMENT
PROPANE
PYRIDINE
PYRIDINES
RESIDUES
SMOKES
SOLS
SRC-II PROCESS
SYNTHETIC FUELS
SYNTHETIC PETROLEUM
THERMOCHEMICAL PROCESSES
TOLUENE
WASTES
YIELDS