Using the Adiabatic Flame Temperature to Predict the Flammability of Lower Alkanes, Carboxylic Acid and Acetates

摘要

A Gibbs Free Energy minimization procedure is used to predict the flammability envelopes of alkanes, carboxylic acids, and acetates. In addition to providing the calculated adiabatic flame temperature (CAFT), the product profiles reveal regions of incomplete combustion products and the onset of cracking. Temperatures at the predicted onset of cracking appear to be closely related to the temperature at the upper flammability limit. The predictions also reveal local maxima and minima in the concentrations of reaction products. Maps of incomplete combustion products for the flammability region show that incomplete combustion products are produced at fuel/oxygen ratios below the fuel/oxygen stoichiometric ratio. This region decreases as the limiting oxygen concentration is approached.