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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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Table 20 ­ Unrecovered Waste Heat and Work Potential from Selected Process Exhaust Gases Source Aluminum Primary Hall Heroult Cells Aluminum Secondary no Recovery with Recovery Iron/Steel Making Energy Consumption Assumed Average Exhaust Temperature Waste Heat 77°F [25°C] Ref Waste Heat 300°F [150°C] Ref TBtu/yr 6.73 2.2 4.2 0.4 57.3 13.9 10.0 ­ 1.9 ­ 26.0 5.4 0.1 24.1 6.5 5.4 2.7 3.7 5.8 44.3 9.4 12.8 7.0 15.1 24.0 8.5 ­ 15.3 0.2 100.0 36.5 ­ 36.5 27.0 ­ 257 Carnot Work Efficiency Potential TBtu/yr 7.11 69% 1.8 79% 4.8 63% 0.5 52.3 76% 12.1 37% 4.1 19% 1.0 43% 4.6 26% 0.8 85% 23.0 80% 4.6 38% 0.1 28.9 57% 8.7 76% 5.8 82% 3.4 57% 4.9 81% 6.1 44.1 51% 9.6 59% 12.1 51% 7.1 51% 15.2 24.6 79% 9.9 24% 0.0 75% 14.4 38% 0.3 414.2 44% 76.6 30% 116.5 44% 76.6 34% 144.4 29% 17.8 589 Coke Oven 65.5 Gas Waste Gas Blast Furnace 642.3 Blast Furnace Gas Blast Stove Exhaust no Recovery with Recovery Basic Oxygen Furnace Electric Arc Furnace no Recovery with Recovery Glass Melting Regenerative Recuperative OxyFuel Electric Boost Direct Melter Cement Wet kiln Dry kiln Preheater (only) Precalciner Metal Casting Aluminum Reverb Furnace Stack Melter Iron Cupola no Recovery with Recovery Boilers 6,500.0 1,169.7 260 173.8 150 394.3 260 173.8 177 427.8 149 60.5 1,478 Conventional Fuels no Recovery with Recovery Byproduct Fuels no Recovery with Recovery Ethylene Furnace TBtu/yr °F °C TBtu/yr 146.1 9.47 134.6 1,292 700 2.6 9.3 2,100 1,150 6.1 2.2 1,000 538 0.8 828.6 79.1 812.5 500 2,437.5 300 812.5 500 2,437.5 350 374.0 300 Total 8,439 1,800 980 15.8 392 200 11.2 200 430 5.3 36.2 482 250 10.6 34.1 266 130 3.2 49.7 3,100 1,700 27.1 57.7 2,200 1,200 5.8 13.3 400 204 0.2 125.8 43.0 54.4 800 427 15.1 13.6 1,800 982 7.6 12.8 2,600 1,420 4.2 34.9 800 427 8.6 10.1 2,400 1,316 7.5 389.5 83.1 98.0 640 338 18.8 80.2 840 449 20.6 67.8 640 338 13.9 143.4 640 338 29.7 74.6 32.8 19.0 2,100 1,150 12.5 1.1 250 121 0.2 46.7 1,650 900 19.3 7.8 400 204 0.8 53

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