Waste Heat to Energy Tech Opportunities in US Industry

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Waste Heat to Energy Tech Opportunities in US Industry ( waste-heat-energy-tech-opportunities-us-industry )

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Temperature Range Typical Sources of Waste Heat Typical Uses Type of Heat Exchange (Gas­ Gas, Gas­ Liquid, etc.) Recovers Moisture Large Temperature Differentials Permitted No Cross­ Contamination Corrosive Gases Permitted with Special Construction Recovery Method Radiation Recuperator Soaking or annealing ovens, melting H furnaces, incinerators, radiant­tube Combustion air preheat G­G Combustion air preheat G­G X X X Convection Recuperator Soaking or annealing ovens, melting M­H furnaces, incinerators, radiant­tube X X X Metallic Heat Wheel Hygroscopic Heat Wheel Ceramic Heat Wheel burners, reheat furnace L­M Boiler exhaust, curing and drying Combustion air preheat, G­G b space heat Combustion air preheat, G­G X space heat c x c X X Plate­type Heat Exchanger Exhaust from boilers, incinerators, L,M & turbines Combustion air preheat, space heat G­G, L­L X X Heat Pipe L­H furnaces (secondary recovery) Drying, curing & baking ovens d X X Finned­tube Heat Exchanger L,M Boiler exhaust Boiler feedwater G­L preheat X X e Waste­heat Boilers Exhaust from gas turbines, L­H reciprocating engines, incinerators, Hot water or steam generation G­L X e Tube Shell­and Tube Exchanger L,M waste steam distillation condensates, coolants from engines, air compressors, bearings & lubricants Liquid feed flows G­L, L­L requiring heating X X burners, reheat furnace Table 8 ­ Comparison of Heat Recovery Technologies a ovens M Boiler exhaust, curing and drying ovens M­H Large boilers, incinerator exhaust, Combustion air preheat, G­G X melting furnaces Drying, curing, and baking ovens Waste steam, air dryers, kilns (secondary recovery), reverberatory Combustion air preheat, boiler makeup water preheat, domestic hot G­G,G­L water, space heat furnaces Refrigeration condensates, waste steam distillation condensates, a. Sources: W. Turner. Energy Management Handbook, 2007; PG&E Energy Efficiency Information “Industrial Heat Recovery Strategies,” 1997 b. claimed by some vendors c. with a purge section added, cross­contamination can be limited to less than 1% by mass d. allowable temperatures and temperature differential limited by the phase equilibrium properties of the internal fluid e. can be constructed from corrosion­resistant materials, but consider possible extensive damage to equipment caused by leaks or tube ruptures

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