The running condition of a certain process was checked without separate measuring equipment by combination the data obtained from the conventional cement manufacturing process. The oxygen ratio of the flow between the preheater for cement raw material powder and exhaust gas outlet, the burnt fuel quantity per hour of the preheater burner and calcining furnace burner, each ratio of oxygen and carbon dioxide measured from inlet flow of calcining furnace, the quantity of cement raw material for clinker per hour, and the rate of partial pressure of carbon dioxide in exhaust gas are measured and combined to check the running condition. |