Apparatus and method for heating and firing fly ash

摘要

An apparatus and method for heating and firing fly ash with low energy costs are provided. A heating and firing apparatus (2) having a combustion furnace for combusting and reducing the unburned carbon of raw powder containing fly ash and unburned carbon, wherein the combustion furnace removes the unburned carbon in the furnace. Stirring means for stirring, oxygen supply means for supplying oxygen into the furnace, and combustion means for burning fuel toward the furnace filled with oxygen supplied from the oxygen supply means, A heating device that preheats the unburned carbon supplied to the combustion furnace to a preheating set temperature higher than a temperature lower by at least 200 ° C. than the ignition temperature of the unburned carbon is provided in a front stage of the combustion furnace. . [Selection] Figure 1