Cement, Energy and Environment July-Sep 2002

- r ' • coupl ed to V-belt dri ve system. Primary air fans of both kilns Measure Reduction of ESP fans ' speed Modi fication of primary air fans Total 1998-1999 r Limestone tertiary crusher • Grate bars of the crusher were Measure Mod ification of grate bars of limestone tertiary crusher Total 1999-2000 :.- Packing pla nt section • Repl acement of power- Measure Use of reciprocating compressor instead of roots blowers from available surplus machines Total 2000-2001 :,. Raw mill section • Optimisation of dedusting air of raw meal silos' BDC. • • were modifi ed· to optimise their operation as per actual process requirement. Inves tment The respective investments for the above measures and the savings accruing them are as fol lows : Savin g Rs, Lac Units/t clinker Rs Lac/annum 1.20 0.48 1.68 mod ifi ed to ac hieve fi ne r material , resulting in higher raw mill output @ 6 TPH, besides saving in power. Investment 1.90 36.7 1 0.22 4.25 2.12 40.96 -The investment on th e modification and the resul tin g saving are as follows : Saving Rs, Lac Units/t clinker Rs Lac/annum 1.00 1.00 de fi c ien t roots blowers fo r pack ing plant si lo by reciprocati ng compressor. Investment 1.46 29.00 1.46 29.00 The inves tment on the replacement and the accrued saving are as follows : Saving Rs, Lac Units/hr of Rs Lac/ann um working 0. 13 0. 13 Optimisation of dedusting air of raw mills feeding system. Switch-over from oil to grease lubrication for high- efficiency sepa rators' rotor bearings. I0.48 3.04 10.48 3.04 :,... Water supply section • Installation of noat switches in overhead water tanks. The respective investments on these measures and the sav ings accruing from them are as follows : m