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Thermal Energy Equipment: Waste Heat Recovery Table 2 gives the temperatures of waste gases from industrial process equipment in the high temperature range. All of these results are from direct fuel fired processes. Table 2. Typical Waste Heat Temperature at High Temperature Range from Various Sources Types of Devices Nickel refining furnace Aluminium refining furnace Zinc refining furnace Copper refining furnace Steel heating furnace Copper reverberatory furnace Open hearth furnace Cement kiln (Dry process) Glass melting furnace Hydrogen plants Solid waste incinerators Fume incinerators Temperature (0C) 1370 –1650 650 –760 760 –1100 760 –815 925 –1050 900 –1100 650 –700 620 –730 1000 –1550 650 –1000 650 –1000 650 –1450 Table 3 gives the temperatures of waste gases from process equipment in the medium temperature range. Most of the waste heat in this temperature range comes from the exhaust of directly fired process units. Table 3. Typical Waste Heat Temperature at Medium Temperature Range from Various Sources Types of Devices Steam boiler exhaust Gas turbine exhaust Reciprocating engine exhaust Reciprocating engine exhaust (turbo charged) Heat treatment furnace Drying & baking ovens Catalytic crackers Annealing furnace cooling systems Temperature (0C) 230 –480 370 –540 315 –600 230 –370 425 –650 230 –600 425 –650 425 –650 Table 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. Table 4. Typical Waste Heat Temperature at Low Temperature Range from Various Source s Source Temperature 0C Process steam condensate Cooling water from: Furnace doors Bearings Welding machines Injection molding machines Annealing furnaces 55-88 32-55 32-88 32-88 32-88 66-230 Energy Efficiency Guide for Industry in Asia –www.energyefficiencyasia.org ©UNEP 13PDF Image | Thermal Energy Equipment Waste Heat Recovery
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