POSTFLAME BY-PRODUCT FORMATION FROM SIZE-AND DENSITY-CONTROLLED l,l,l-TRICHLOROETHANE SPRAYS

摘要

The effect of atomization quality on the postflame thermal destruction of liquid-phase chlorinated hydrocarbons(CHCs) is detailed. Our goal is to determine how droplet heat up and gasification processes, and therefore, subsequent destruction chemistry, are influenced by spray conditions. Controlled atomization of the liquid CHC is achieved using a prefilming double annular airblast atomizer capable of independently varying Sauter mean kiameter (SMD) and mean interdroplet spacing (or droplet number density).Injector performance is validated and mapped over a range of conditions in a series of cold-flow spray characterization tests. Three operating points representing extremes in measured SMD and interdroplet spacing are used to inject liquid l,l,l-trichloroethane into the postflame region of a vertically oriented combustion-driven flow reactor. Thermal destruction and by-product formation results yielded expected variations with temperature, as well as notable perturbations with equivalence ratio, droplet size, and to a lesser extent ,interdroplet spacing.