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WASTE HEAT RECOVERY

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WASTE HEAT RECOVERY ( waste-heat-recovery )

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TABLE 8.4 TYPICAL WASTE HEAT TEMPERATURE AT LOW TEMPERATURE RANGE FROM VARIOUS SOURCES Source Process steam condensate Cooling water from: Furnace doors Bearings Welding machines Injection molding machines Annealing furnaces Forming dies Air compressors Pumps Internal combustion engines Air conditioning and refrigeration condensers Liquid still condensers Drying, baking and curing ovens Hot processed liquids Hot processed solids 8.3 Benefits of Waste Heat Recovery Temperature, oC 55-88 32-55 32-88 32-88 32-88 66-230 27-88 27-50 27-88 66-120 32–43 32-88 93-230 32-232 93-232 8. Waste Heat Recovery Benefits of ‘waste heat recovery’ can be broadly classified in two categories: Direct Benefits: Recovery of waste heat has a direct effect on the efficiency of the process. This is reflected by reduction in the utility consumption & costs, and process cost. Indirect Benefits: a) Reduction in pollution: A number of toxic combustible wastes such as carbon monoxide gas, sour gas, carbon black off gases, oil sludge, Acrylonitrile and other plastic chemicals etc, releasing to atmosphere if/when burnt in the incinerators serves dual purpose i.e. recovers heat and reduces the environmental pollution levels. b) Reduction in equipment sizes: Waste heat recovery reduces the fuel consumption, which leads to reduction in the flue gas produced. This results in reduction in equipment sizes of all flue gas handling equipments such as fans, stacks, ducts, burners, etc. c) Reduction in auxiliary energy consumption: Reduction in equipment sizes gives additional benefits in the form of reduction in auxiliary energy consumption like electricity for fans, pumps etc.. Bureau of Energy Efficiency 4

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