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1 SURVEY OF CHEMICAL EMISSIONS Table 43 provides an overview of energy consumption and emissions from the U.S. cement industry in 1999. The last column shows that the numbers match, when using 90MMT cement production with 26.6% being produced through the wet process. Because most of the emissions from the cement industry are CO2, there is not much opportunity to recover energy. However, there is significant opportunity to use CO2 in tri-reforming of methane, or as feedstock for various chemicals. Table 43. Energy Consumption and Emission in the U.S. Cement Industry in 1999 Fuel Elec (TBtu) (TBtu) 0 4 124 3 0 5 125 12 0 15 254 9 0 12 254 36 379 48 Primary Energy (TBtu) Fuel Elec. Primary CO2 CO2 CO2 SEC SEC SEC Emissions Emissions Intensity (MBtu/ (kWh/ (MBtu/st) Energy Use Calcination (kgC/st) Check, Using 90 MMT Cement 26.6% Wet Process 7.58 227.36 7.58 238.73 26.60 9.61 200.50 8.24 218.35 223.77 73.40 st) st) (MMtCe) (MMtCe) 0.2 0 3.2 2.8 0.2 0 3.6 2.7 0.7 0 6.7 7.9 0.6 0 8 7.9 11.6 10.6 Wet Process Kiln feed preparation Clinker Production Finish Grinding Total Wet Process Dry Process Kiln feed preparation Clinker Production Finish Grinding Total Dry Process Total all cement 13 0 27 0.3 128 6 39 6.4 16 0 57 0.6 157 4.8 132 6.3 44.77612 0 38 0.4 280.8657 4 45 4.5 35.8209 0 52 0.6 361.4627 3.6 150 5.2 518.4627 8.4 282 11.5 4.4 268.5 9.2 249 6.1 231.7 8.3 224.2 230.8 Source: Table 1 of [15]. Table 44 provides a description of potential energy savings in cement production, and Tables 45 and 46 provide details for the dry process and wet process chemical plants, respectively. Following are the main opportunities for recovery energy. • Regularly maintain motors, pumps, and compressors • Ensure most efficient technology is in place for the process • Fine-tune the efficiency of various processes in the plant • Establish relationships with other industries to exchange energy/feedstock from plant emissions 41PDF Image | Analysis for Recovering Energy from Industrial Waste Heat
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