Cement, Energy and Environment July-Sep 2002

Meas ure Tnvestmen.t Saving Rs, Lac Unitsfhr of Rs La c/annum worl.:ing Optimisation of a) Dedusting of air of raw meal silos' BDC 0. 12 10.80 0.37 h) Dcdust ing air of raw mill s feed ing system 0. 15 8.71 1.66 Modi tication of lubrication system of separators for rotor bearings 0.10 13.80 3.62 Installation of float switches in overhead water tanks 0. 15 6.75 2.35 Total 0.52 ..J0.06 8.00 2001-2002 ' ,- Kiln and coa l mill section Replacement of the ESP fa ns of both kilns by high– efficiency fans. of var iable frequency drives (VFD. s). :,.... • • • Raw mill section Ins tallation of variable frequency dri ves (VFD) at • vent fnn s of both raw mills. Repl acement of the f luxo pumps by hi gh-effic iency tandem bucket elevators for raw meal transportation fo r • both raw mill s. Measure lnstalbtion of VFD's for the vent fan s or raw mills Installation of high-efficiency tandem bucket elevators fo r raw meal in place Installation of hi gh-efficie1~cy bucket elevators in ·place of airli ft fo r ki ln fee d transportation system for both kiln s Replacement of the BDC fans of coal mills I and 2 by high– efficiency fans and installation Investment )..– • Cement mill section Replacement of the vent fa ns of cement mills I ami 2 with high-efficiency fan s. The respective investments lor the foregoing measures and the actual/estimated savings ~herefrom are summarised in the Table below: s~tving Rs, Lac Units/hr of Rs Lac/annum working 6.10 20.52 5.70 of the fluxo pumps for both the raw mills 70.00 225 58.75 Replac ement] of the ESP fans of kilns I and 2 with high-efficiency fans 10.00 53 To be II'Orked out Installation of high- effic iency bucket elevators for kiln feed for both kilns in place of airlift 100.00 104 32.95 Repbcement of the coal mill BDC fans (2 nos) with high efficiency fans and installation of vro·s 16.50 34 9.0 Replacement of the cement mill vent rans (2 nos) with high- efficiency fan s 7.00 28 (Estimated) To he 1rorked out Total 209.60 Being worked out