|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Energy Technologies and CO2 Management Symposium
||Waste Heat Recovery from Aluminum Production
||Miao Yu, Maria Sigridur Gudjonsdottir, Pall Valdimarsson, Gudrun Saevarsdottir
|On-Site Speaker (Planned)
Around half of the energy consumed in aluminum production is lost as waste heat. Heat is lost through many processes. Approximately 30-45% of the total waste heat is carried away by the exhaust gas from cells and is the most easily accessible waste heat. Alcoa Fjarðaál, producing 350 000 tons annually, loses around 82.2 MW of heat with the exhaust gas. The heat recovery potential from this source is evaluated in this work, considering electricity production and district heating. The electric power generation potential is estimated by Organic Rankine Cycle models. The maximum power output found is 3.4 MW for an evaporation temperature of 65°C and working fluid of R134a. The potential for direct heat use is roughly 17.4 MW which fulfils the heat requirement for local district heating, opening opportunity for agriculture or industrial applications. Waste heat recovery from exhaust gas thus enables improved energy efficiency in aluminum production.