Cement, Energy & Environment Jan-Mar 2002

Table 4 Benefits from process optimisaiton S.No. Parameter Pre-optimisation Post- ptimisation Power / Fuel saving optimised value value achieved 1 Dust 3 530 /m 687 m 3 0.50 kWh/ ton cement concentration at raw mill outlet 2 Raw mill 174 bar (Max) 155 Bar (Max) 0.58 kWh I ton hydraulic cement pressure 3 False air 22.08% 18.04% 0.21 kWh / ton cement infiltration in raw mill circuit 4 Tertiary air 850nC 876°. c 5.30 kcal I kg clinker temperature 5 Silica modulus of < 2.00% 2.15-2.20 % 1.50 kWh I ton raw mix, cement improved better grinding. 6 Bag house Continuous Differential 0.38 kWh I ton cleaning sequence Pressure (DP) cement operation Based 7 Secondary air 960°C 1020° c 6.60 kcal / kg clinker temperature saved 8 String outlet 310° c 295 °C 8.4 kcal / kg clinker temperature saved. 9 Lowering the 173 mm 153 rnrn 0.23 kWh/ ton height of dam cement ring 20