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THE INFLUENCE OF CARBON BURNOUT ON SUBMICRON PARTICLE FORMATION FROM EMULSIFIED FUEL OIL COMBUSTION
Citation:
Miller*, C A. AND W P. Linak*. THE INFLUENCE OF CARBON BURNOUT ON SUBMICRON PARTICLE FORMATION FROM EMULSIFIED FUEL OIL COMBUSTION. Presented at 28th International Symposium on Combustion, Edinburgh, Scotland, 7/30-8/4/2000.
Description:
The paper gives results of an examination of particle behavior and particle size distributions from the combustion of different fuel oils and emulsified fuels in three experimental combusators. Results indicate that improved carbon (C) burnout from fule oil combustion, either by decreasing the temperature quench rate or by forming smaller fuel droplets through the secondary atomization characteristic of oil/water emulsions, increases the volume of the submicron particle fraction. Also, the use of oil/water emulsions can increase the submicron particle volume compared to a non-emulsified oil burned in the same combustor. In contrast to larger coarse-mode particles which are composed largley of C char and inherently bound metals and sulfur, these submicron particles appear to be composed on metal sulfates that are more water-soluble than the larger coarse-mode particles. For fuel oils, submicron particle volume varies directly with C burnout, and inversely with total particle mass. These metal-sulfate-enriched submicron particles are formed by vaporization and subsequen nucleation, coagulation, and condensation mechanisms. Where normal atomization, high quench rates, or other obstacles to complete combustion exist, substantial amounts of inorganic material remain bound with the unburned C char.