The effect of waste heat of the direct reduction iron in an innovative power-refrigeration cycle
Subject Areas : Journal of New Applied and Computational Findings in Mechanical SystemsMohammad Ebadollahi 1 * , Seyed Hashem Samadi 2
1 -
2 - Ph.D. Graduate in Biosystem Engineering, Tarbiat Modares University, IRITEC Company, Tehran, Iran
Keywords: Direct reduction iron, Midrex, Cogeneration, Organic Rankine Cycle,
Abstract :
Waste heat recovery methods offer a powerful way to increase the overall energy efficiency of industrial facilities and power plants. Many industries – from large steel mills to large power plants – are constantly looking for ways to use energy more efficiently. So, one opportunity to consider is waste heat recovery. Waste heat is the residual heat that comes from industrial processes and is usually just released into the environment. Waste heat recovery systems intelligently capture this residual heat and reuse it instead of wasting it. In this paper, using the waste heat of a sponge iron regeneration unit using the Midrex method as an energy source, a simultaneous power and refrigeration production system using the organic Rankine cycle and the cascade ejector refrigeration cycle for simultaneous power and refrigeration production is investigated and it is shown why waste heat recovery can become an essential part of sponge iron production programs using the Midrex method. According to the results obtained, the net power output of the system and the amount of refrigeration produced by evaporators 1 and 2 were calculated as 47.85, 53.19 and 48.34 kW, respectively. Also, the decision-making indicators of the system, namely the coefficient of performance of the refrigeration cycle, the efficiency of the organic Rankine cycle and the simultaneous production cycle were reported as 0.452, 17.27% and 50.29 %, respectively. Also, a parametric study was conducted at the end of the article to observe the effect of influential system parameters.
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