COUNTERFLOW-DIRECT FLOW SHAFT FURNACE FOR ROASTING OF CARBONATE ROCKS Russian patent published in 2001 - IPC

FIELD: devices for roasting of limestone, dolomite, magnesite, applicable in ferrous and non-ferrous metallurgy, in chemical, food and construction industries. SUBSTANCE: furnace has a shaft with zones for preheating, roasting in direct flow and counterflow cooling, fuel combustion chamber, burner, heat exchanger. The circular gas-distributing channel with holes is positioned in the roasting zone, the distance between the holes for gas discharge to the furnace makes up 200 to 600 mm, and the relationship between the circular channel section area and the section area of the holes is within 1.0 to 2.0. EFFECT: eliminated nucleation sites for burning in the shaft boundary area and equalized temperature field. 1 dwg