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pesticides; synthetic fuels from coal, polymers and fibers; food; beverage; pharmaceutical; and minerals and metals industries. The analyses have resulted in annual energy savings exceeding $150 million, with paybacks typically less than two years. Table 2 summarizes selected results from these analyses conducted to identify and implement waste-heat recovery projects that met payback requirements of the industrial facility. Table 2. Selected Results from Global Energy Partners/EPRI Waste-Heat Recovery Analyses Project category Preheat boiler feedwater Preheat deaerator makeup water by cooling two product streams Replace heat exchanger Condensate heat recovery MVR heat pump on distillation column Hot water heat recovery Re-pipe condenser Heat pump on refrigeration condensate to heat water Boiler economizer Heat pump in BTX unit Heat exchange with effluents MVR heat pump on distillation column Heat exchange with effluents Recycle press shower water Improve/replace economizer Heat pump on refrigeration condensate Preheat press shower water with exhaust air Preheat mill water with process effluent Preheat boiler feedwater Type of industry Pulp and paper Refinery Pulp and paper Pulp and paper Specialty chemicals Pulp and paper Pulp and paper Dairy Dairy Refinery Pulp and paper Refinery Pulp and paper Pulp and paper Paper Pharmaceutical Paper Newsprint Annual savings ($) 3,000,000 383,000 503,600 700,000 1,153,000 3,000,000 640,000 150,000 30,000 1,750,000 325,000 360,000 1,400,000 1,350,000 149,000 21,900 111,000 75,000 Capital costs ($) Simple payback (years) Pulp and paper Data derived from (Global 2006a) 600,000 0.2 67,000 0.2 260,000 0.5 400,000 0.6 1,825,000 1.1 3,750,000 1.2 800,000 1.2 225,000 1.5 20,000 1.5 2,760,000 1.5 520,000 1.6 600,000 1.7 2,450,000 1.8 2,600,000 1.9 299,000 2.0 55,000 2.5 291,000 2.6 207,000 2.8 3,000,0000 3.0 1,000,0000 Wood drying (Fouche, Ed and Heck, Greg 2006). The single largest application of industrial heat pumps is lumber drying. Southern Company is currently evaluating a customized, heat pump-driven kiln for drying softwood lumber. Moisture-laden air that would otherwise be vented to the atmosphere is brought past the evaporation coil, where it condenses to a liquid stream containing VOCs (requires some venting). Preliminary results show that about 6 lbs. of water is removed per kWh (570 Btu/lb). © 2007 ACEEE Summer Study on Energy Efficiency in Industry 2-9PDF Image | Industrial Waste Heat Recovery Benefits and Recent Advancements in Technology and Applications
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