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Flame Spray Drying

This article presents results of preliminary studies on a novel spray drying method; i.e., spray drying with a simultaneous ignition of a sprayed medium, termed Flame Spray Drying (FSD). Preliminary FSD trials were carried out to determine the concentration of a flammable spray component at which flame could be initiated and combustion process sustained for two materials with different thermal sensitivity (i.e., maltodextrin and ceramic powder) and two flammable components: ethyl alcohol and sunflower oil. The analysis of temperature distributions in the atomization/flame zone shows significant differences in the evaporation rate for different fuels. Combustion of ethyl alcohol results in higher temperatures and a 0.5 to 1.0 m shorter combustion/evaporation zone in relation to the flame formed with the sunflower oil. Puffing and robust agglomeration of particles and partial caramelization of some powders was observed as a result of an intensive heat and mass transfer in the flame zone.