Thermohydrodynamic Processes in Spray Drying with Convective–Radiation Energy Supply

Abstract

The results of numerical modeling of the heat and mass transfer of drops during drying of a liquid under the conditions of convective–radiation energy supply and counterflows of the heat-transfer fluid are presented. The effect of various parameters, in particular, density of the infrared flux, velocity of the counterflows of the heat-transfer fluid, and overheating temperature of the liquid before drying, on the kinetics of evaporation of the drops, is analyzed. The possibilities for the reduction of the duration of drying of the drops due to the radiation action are shown. The results of experimental studies of the effect of the infrared flux on the performance indicators of a spray drying unit are presented, which provide evidence of a decrease in the specific energy costs for moisture evaporation and an increase in the moisture tension, productivity, and efficiency coefficient of the unit.