Cement, Energy and Environment July-Sep 2002

• The respective investments on these measures and the savings accruing from them are as follows : Measure New air slide for kiln feed Optimisation of blowers at CF silo and mixing bin VFD for a) Cooler fan V6 b) Coal mill BDC fan Stopping of cooling tower system during winter months Total 2000-2001 • );> Raw mill section • VFD installed at raw mill vent fan. Investment Saving Rs, Lac Units Rs Lac/annum 0.85 5.87 U/hr 1.82 From available surplus machinery 14.00 U/hr 4.34 5.28 16.00 U/hr 4.97 9.24 56.00 U/hr 11.80 Nil 31.40 U/day 0.10 15.37 - 23.03 Upgradation of raw mill capacity by installing tertiary crusher at raw mill inlet. Figure 3 shows the te ritary crusher. The raw mill circuit after the modifications is depicted in Figure 4. Figure 3 Installation oflimestone tertiary crusher MOGENSEN SIZER .• TEJU1ARY CRUSHERS Figure 4 Raw mill circuit after modifications m