Cement, Energy and Environment July-Sep 2002

Measure Raw mill vent fan change Cooler vent fan change Replacement of motorised air sluice with flap valves Optimisat ion of ki ln and PC firing blowers Replacement of cooling-tower- fan aluminium blades with FRP blades Optimi sation of cement transport ai r Optimisation of compressed air d istri bution Replacement of motori sed bag deflectors with fixed polymer bag deflectors Total 1998-1999 • Raw mill section Direct chute provided in belts of raw mill s I and 2 for additive-feeding ho ppers. Measure Provision of direct chute eliminating belt feeding to raw mill s Optimisation of cement mills 13DCs' vent ai r and purging air Total 1999-2000 ,.. Kiln section • New air slide provided for kiln feed section, reta ining the earlier inclined sc rew ' ,.. • • • Investment Saving Rs, Lac Uni ts Rs Lac/annum 17.60 0.45 U/t cement 13. 18 64.65 1.94 U/t cement 56.85 Insignificant 4.80 U/hr 1.1 9 Jnsignilicant 33.56 U/hr 8.34 0.28 2.0 U I hr 0.49 Insignificant 73.00 U I hr 10.85 Insignificant 31.00 U I hr 4.32 Insign ificant 7.20U / hr 2.71 82.53 - 97.33 e liminating operat ion of feed ing belt. air and purging air. The respective investments on these measures and the sav ings accruing from them are as foliO\\ s : Cement mill section Opti misation of 13DCs' vent In vestment Rs, Lac Saving Units Rs Lac/a nnum lnsignilicant 28.00 U/Day 0.26 Insignificant 15.90 U/1-l r 2.77 I n signitic~m t ---- conveyor as standby. • Optimisation of blowers at CF silo and mixing bin. • VFD installed for V6 cooler fan. 3.03 VFD installed for coal mill BDC fan. Stopping of cooli ng tower fan a'nd hot water pump during winter months. •