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Waste Heat Recovery from Aluminum Production

机译：从铝生产中储存热量回收

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Around half of the energy consumed in aluminum production is lost as waste heat. Approximately 30-45% of the total waste heat is carried away by the exhaust gas from the smelter and is the most easily accessible waste heat stream. Alcoa Fjaroaal in east Iceland produces 350 000 tons annually, emitting the 110°C exhaust gas with 88.1 MW of heat, which contains 13.39 MW exergy. In this study, three scenarios, including organic Rankine cycle (ORC) system, heat supply system and combined heat and power (CHP) system, were proposed to recover waste heat from the exhaust gas. The electric power generation potential is estimated by ORC models. The maximum power output was found to be 2.57 MW for an evaporation temperature of 61.22°C and R-123 as working fluid. 42.34 MW can be produced by the heat supply system with the same temperature drop of the exhaust gas in the ORC system. The heat requirement for local district heating can be fulfilled by the heat supply system, and there is a potential opportunity for agriculture, snow melting and other industrial applications. The CHP system is more comprehensive. 1.156 MW power and 23.55 MW heating capacity can be produced by CHP system. The highest energy efficiency is achieved by the heat supply system and the maximum power output can be obtained with the ORC system. The efficiency of energy utilization in aluminum production can be effectively improved by waste heat recovery as studied in this paper.
机译：在铝生产中消耗的一半能量损失为废热。总废热的约30-45％由废气从冶炼厂带走，是最容易获得的废物热流。 Alcoa Fjaroaal在东冰岛每年生产3.5万吨，发出110°C的排气，88.1兆瓦的热量，含有13.39兆瓦。在本研究中，提出了三种场景，包括有机朗肯循环（ORC）系统，供热系统和组合的热量和功率（CHP）系统，以从废气中回收废热。通过ORC模型估计发电电位。最大功率输出被发现为2.57mW，蒸发温度为61.22°C和R-123作为工作流体。 42.34 MW可以通过热源系统产生具有相同温度下降的兽人系统中的废气温度下降。供热系统可以满足当地地区供暖的热量要求，潜在的农业，融雪和其他工业应用。 CHP系统更全面。 1.156 MW功率和23.55 MW加热容量可通过CHP系统生产。通过供热系统实现的最高能量效率，并且可以利用逆转器系统获得最大功率输出。通过本文研究的废热回收，可以有效地提高铝生产能量利用效率。

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