Authors: Hassan Payab & Fatemah Mahnaz Mohsenzadeh
Abstract: Mathematical model for a pilot scale iron ore pellet induration furnace has been developed which considers the process of induration including the reactions of limestone, magnetite and coke. The differential equations of energy, mass and momentum are solved simultaneously. The profiles of temperature, pressure and concentration are obtained. The validity of the model has been checked by performing separate experiments on sub processes; drying, firing and cooling. Finally, the optimum percentage of coke in the iron ore is determined. By using different percentage of coke in the pellet the experiments are performed in three conditions. In the first condition, inlet gas temperature is decreased alone. In the second condition, inlet gas temperature and total indurtion time are decreased together and in the third condition , in addition to above conditions, oxygen injection to the furnace is carrried out. Energy savings in all three conditions have been obtained.
Keywords: mathematical model, air polution, induration ore, pelletizing, energy saving, iron ore, air pollution