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WASTE HEAT RECOVERY

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WASTE HEAT RECOVERY ( waste-heat-recovery )

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TABLE 8.2 TYPICAL WASTE HEAT TEMPERATURE AT HIGH TEMPERATURE RANGE FROM VARIOUS SOURCES Types of Device Nickel refining furnace Aluminium refining furnace Zinc refining furnace Copper refining furnace Steel heating furnaces Copper reverberatory furnace Open hearth furnace Cement kiln (Dry process) Glass melting furnace Hydrogen plants Solid waste incinerators Fume incinerators Type of Device Steam boiler exhausts Gas turbine exhausts Reciprocating engine exhausts Reciprocating engine exhausts (turbo charged) Heat treating furnaces Drying and baking ovens Catalytic crackers Annealing furnace cooling systems Low Temperature Heat Recovery Temperature, oC 1370 –1650 650-760 760-1100 760- 815 925-1050 900-1100 650-700 620- 730 1000-1550 650-1000 650-1000 650-1450 Temperature, oC 230-480 370-540 315-600 230- 370 425 - 650 230 - 600 425 - 650 425 - 650 8. Waste Heat Recovery TABLE 8.3 TYPICAL WASTE HEAT TEMPERATURE AT MEDIUM TEMPERATURE RANGE FROM VARIOUS SOURCES The following Table 8.4 lists some heat sources in the low temperature range. In this range it is usually not practical to extract work from the source, though steam production may not be completely excluded if there is a need for low-pressure steam. Low temperature waste heat may be useful in a supplementary way for preheating purposes. Bureau of Energy Efficiency 3

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