Оn the Role of the Thermal Lag in Thermal Treatment of Pellets in the Roasting Conveyor Machines
The features of heat-and-mass exchange have been studied by the math modeling method in the bed of iron ore pellets in roasting conveyor machines. Two thermal (temperature) waves in the bed were detected. Those waves are generated by gas-heat carrier from hood and thermal source due to exothermal effect of magnetite oxidation reaction. Control of these thermal waves facilitates an optimization of temperature gas-through-pellet-bed velocity within machine length in order to minimize fuel consumption for pellets roastinging and their quality improvement.