Experimental flammability limits and associated theoretical flame temperatures as a tool for predicting the temperature dependence of these limits.
J Loss Prev Process Ind 2012 May; 25(3):555-560
Abstract: The utility and limitations of adiabatic flame temperature calculations and minimum mixture energies in predicting the temperature dependence of flammability limits are explored. The limiting flame temperatures at constant pressure (1 bar) are calculated using a standard widely-used thermodynamic computer program. The computation is based on the calculated limiting flame temperature value at the reference initial temperature and the experimental limit concentration. The values recently determined in large chambers for the lower and upper flammability limits of a variety of simple organic and inorganic gases (methane, ethylene, dimethy lether, and carbon monoxide) are used as the basis for the predictions of the limiting flame temperature concept. Such thermodynamic calculations are compared with more traditional ones based on a limiting mixture energy and a constant average heat capacity of the reactant mixture. The advantages and limitations of the methods are discussed in this paper.
Mining-industry; Temperature-effects; Temperature-control; Flammable-gases; Flammable-liquids; Temperature-regulation; Thermodynamics; Thermoregulation; Computer-models; Heat-regulation; Fuels; Reaction-rates; Mathematical-models; Combustibility; Combustible-materials; Ignition-systems; Inorganic-compounds; Organic-compounds;
Author Keywords: Flammable limits; Temperature dependence; Limit flame temperature; Thermodynamic calculation
Isaac A. Zlochower, Office of Mine Safety and Health Research, National Institute for Occupational Safety and Health, Pittsburgh, PA, USA
Journal of Loss Prevention in the Process Industries