Manufacture of cement consists of the following three processes
①Raw materials process ②Burning process ③Finishing process
A lot of thermal energy is used in the cement plants. The orange line in the figure of burning process shows the flow of gas. The gases from rotary kiln and cooler are high temperature. When these gases are exhausted, the thermal energy of there gases is not used effectively. Then, the manufacturing processes of cement are designed to use the thermal energy of gases thoroughly. The gases from rotary kiln and cooler are led to the preheater. The thermal energy of these gases is used for the heating of raw material including calcination of carbonate. And then, the gas from preheater is led to the boiler(*) for generating steam of power generation. Finally, the gas from the boiler is led to the raw grinding mill at raw materials process, and the thermal energy of this gas is used for drying raw materials. Overall, the plant operates at over 80% thermal efficiency.
(*) The boiler may not be installed.
