Influence of nitrogen dilution and flame temperature on soot formation in diffusion flames

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(93)90202-E· OSTI ID:6922887

Gulder, O L; Snellin, D R ^[1]

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1. National Research Council of Canada, Ottawa, ON (Canada)

This paper reports the line-of-sight soot surface temperatures and soot volume fractions that were measured as a function of axial position in overventilated coflow laminar diffusion flames. A comparison of the influence of nitrogen dilution and the flame temperature on soot formation in diffusion flames of ethylene was made, and the relative importance of the two effects was quantified. To isolate the influence of the dilution and flame temperature, a reference condition was specified, such that the temperature of the reactants was 623 K without nitrogen dilution of the fuel gas. In dilution experiments, the temperature of reactants was at the reference temperature and the nitrogen dilution of the ethylene was varied from 0 to 0.78 mole fraction. In a second set of experiments, where dilution was zero, the flame temperature was varied by reducing the temperature of the reactants from 623 to 298 K in six steps. The reduction in soot formation is due to both lowered temperature and fuel concentration in dilution experiments, and due to only lowered temperature in undiluted flames since the temperature was varied by controlling the temperature of the reactants. The difference between the two sets of results, for the same flame temperature, gives the influence of dilution on soot formation.

• OSTI ID: 6922887
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 92:1-2; ISSN 0010-2180; ISSN CBFMAO
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALKENES
DIFFUSION
DILUTION
ELEMENTS
EQUATIONS
ETHYLENE
FLAMES
FLUID FLOW
HYDROCARBONS
LAMINAR FLOW
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
SOOT
TEMPERATURE DEPENDENCE
TEMPERATURE DISTRIBUTION
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K