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Waste Heat Source Hot alumina from calciner operation Smelting—heat from side walls that vary in temperature from 550°– 750°F (290°–400°C). Off gases from smelting operations before entering a scrubber. The gases are at about 212°F (100°C) Products of combustion from anode baking operations. These gases are at 400°–600°F (200°–316°C). Heat Recovery Opportunities Hot alumina from calciner operation Heat recovery in the form of electricity using TEG devices. Recovery of low-grade (temperature) sensible heat from hot gases. Recovery of chemical and sensible heat from low-temperature exhaust gases. Barriers or Limitations – Currently Available Equipment Easy and convenient method of recovery and use of this heat within the plant. Recovery of heat without affecting temperature profile within the pots. Low temperature and presence of particulates. Presence of condensable tar vapors and particulates at low temperature. Exhibit 12: Matrix of Waste Heat Sources, Recovery Opportunities and Barriers for the Aluminum Industry Calciner exhaust gases at 350°– 400°F (180°–200°C) containing more than 50% moisture and particulates Recovery of sensible and latent heat of moisture. High moisture content, presence of particulates (alumina), and low temperature. Lack of use of low-grade heat in the form of hot water or air within the plant. Exhaust gases from melting furnaces Recovery of sensible and latent heat from flue gases. High-temperature (1,600°–2,000°F or 870°–1,100°C)., variations in temperature, and presence of particulates in gases. In some cases the gases need to be cooled for particulate collection in a baghouse. Low- to medium-temperature (or grade) heat available in the form of exhaust gases from heating and heat treating furnaces (usually batch operations). Recovery of heat from low- and medium-temperature combustion products. Low-temperature, variable flow, and temperature die to batch operations, lack of use of low-grade heat in the plant. Industrial Waste Heat Recovery Page 29PDF Image | Industrial Waste Heat Recovery: Potential
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