Incipient soot formation in dichloromethane-methane-air premixed flames

Journal Article · Mon Apr 01 00:00:00 EST 1991 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(91)90005-V· OSTI ID:5151454

Janssen, J M; Sender, D W ^[1]

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1. Thermal Sciences and Propulsion Center, School of Mechanical Engineering, Purdue Univ., West Lafayette, IN (US)

Measurements are presented of critical sooting equivalence ratio and peak flame temperature for mixtures of dichloromethane and methane in air. Flame temperature variation was achieved by controlling total mass flux through an atmospheric-pressure, uncooled flat flame burner. A comparison of coated and uncoated thermocouple measurements is given, showing the effect of catalytic surface reactions to be negligible compared to errors in the calculation of radiation loss. The data are correlated using a global model developed for soot inception studies in premixed hydrocarbon flames. The importance of evaluating the correlation in primitive as opposed to parametric variables is shown. The model features two parameters, an activation energy difference and a variable {beta} that has previously been correlated with fuel type in hydrocarbon studies. In chlorinated mixtures, the activation energy difference for incipient soot temperature dependence agrees well with that reported for aliphatic hydrocarbons. The fuel-dependent correlation parameters used for hydrocarbons, C/H ratio and number of C-C bonds, are not sufficient to explain the behavior of chlorinated mixtures. The parameter {beta} is shown to depend on the Cl/H ratio in addition to possible dependence on C/H ratio and/or number of C-C bonds. Analysis shows this is consistent with the known chemical effects of chlorine on hydroxyl radicals and fuel molecules. At constant temperature, the effects of chlorine on hydroxyl concentration and fuel pyrolysis are shown to be of comparable magnitude.

• OSTI ID: 5151454
• Journal Information: Combustion and Flame; (United States), Vol. 84:4; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FLAMES
SOOT
TEMPERATURE MEASUREMENT
ACTIVATION ENERGY
BURNERS
COMPARATIVE EVALUATIONS
FUELS
HYDROCARBONS
METHANE
PYROLYSIS
TEMPERATURE DEPENDENCE
ALKANES
CHEMICAL REACTIONS
DECOMPOSITION
ENERGY
EVALUATION
ORGANIC COMPOUNDS
THERMOCHEMICAL PROCESSES
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry