THEORETICAL AND TECHNOLOGICAL FOUNDATIONS OF ENERGY-SAVING CEMENT PRODUCTION FROM EXTREMELY COARSE RAW MATERIALS

Abstract

The extremely coarse grinding of the raw material makes it possible to increase the amount of melt and reduce the temperature of its appearance to 1100 °C. Based on this, the higher reactivity of the extremely coarse raw material mixture allows its saturation coefficient and silicate modulus to be increased. Thermal preparation of extremely coarse material in the preparation zones of the furnace is improved by up to 50%. This is due to the exit of the extremely coarse material from the pseudo-liquid state and its well-functioning rolling, accompanied by a significant intensification of the renewal of its outer surface and the increase in its heat exchange surface, as well as its higher thermal conductivity. Heat losses are significantly reduced as a result of lowering the temperature of flue gases, improving heat transfer in the preparatory zones of the furnace, reducing the temperature of the furnace shell and dust removal from the furnace. This provides a reduction in fuel consumption by up to 15% and an increase in furnace productivity by up to 30%.