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1 SURVEY OF CHEMICAL EMISSIONS Table 46. Energy Efficiency Measures in Wet Process Cement Plants Energy-Efficiency Measure Raw Materials Preparation Slurry blending and homogenizing Wash mills with closed circuit classifier High-efficiency classifiers Fuel preparation: roller mills Clinker Making Energy management & control systems Seal replacement Combustion system improvement Indirect firing Shell heat loss reduction Optimize grate cooler Convert to grate cooler Conversion to semi-wet process kiln Conversion to semi-dry process kiln Efficient mill drives Use of secondary fuels Finish Grinding Energy management & process control Improved grinding media in ball mills High-pressure roller press High-efficiency classifiers Plant-Wide Measures Preventive maintenance High-efficiency motors Adjustable speed drives Optimization of compressed air systems Efficient Lighting 0-0.5 Product Change Blended cement Limestone Portland Cement Use of steel slag in clinker Low-alkali cement Reduced fineness of cement for selected use Source: Table 4 of [15]. Specific Fuel Savings (MBtu/ton) 0.14-0.27 0.02 0.15-0.55 0.13-0.19 0.09-0.30 0.06-0.13 0.24 0.9 0.8-1.2 > 0.5 0.04 1.21 0.30 0.16 0.16-0.4 Specific Electricity Savings (kWh/ton cement) 0.1-0.6 10-14 4.3-5.8 0.7-1.6 1.0-2.0 -2.4 -4 -4to-6 0.7-2.7 1.6 1.8 7-25 1.7-5.4 0-5 0-5 5-7 0-5 -15 3.0 0-14 Estimated Payback Period (years) <3 >10 >10 <2 <1 2-3 1 1-2 1-2 >10 >10 1 1 <1 8 >10 >10 <1 <1 2-3 <3 <1 <1 <2 Immediate Immediate 44PDF Image | Analysis for Recovering Energy from Industrial Waste Heat
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