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Case study of an organic Rankine cycle (ORC) for waste heat recovery from an electric arc furnace (EAF)

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Title: Case study of an organic Rankine cycle (ORC) for waste heat recovery from an electric arc furnace (EAF)
Authors: Lecompte, S
Oyewunmi, OA
Markides, C
Lazova, M
Kaya, A
Van den Broek, M
De Paepe, M
Item Type: Journal Article
Abstract: The organic Rankine cycle (ORC) is a mature technology for the conversion of waste heat to electricity. Although many energy intensive industries could benefit significantly from the integration of ORC technology, its current adoption rate is limited. One important reason for this arises from the difficulty of prospective investors and end-users to recognize and, ultimately, realise the potential energy savings from such deployment. In recent years, electric arc furnaces (EAF) have been identified as particularly interesting candidates for the implementation of waste heat recovery projects. Therefore, in this work, the integration of an ORC system into a 100 MWe EAF is investigated. The effect of evaluations based on averaged heat profiles, a steam buffer and optimized ORC architectures is investigated. The results show that it is crucial to take into account the heat profile variations for the typical batch process of an EAF. An optimized subcritical ORC system is found capable of generating a net electrical output of 752 kWe with a steam buffer working at 25 bar. If combined heating is considered, the ORC system can be optimized to generate 521 kWe of electricity, while also delivering 4.52 MW of heat. Finally, an increased power output (by 26% with combined heating, and by 39% without combined heating) can be achieved by using high temperature thermal oil for buffering instead of a steam loop; however, the use of thermal oil in these applications has been until now typically discouraged due to flammability concerns.
Issue Date: 7-May-2017
Date of Acceptance: 4-May-2017
URI: http://hdl.handle.net/10044/1/48442
DOI: https://dx.doi.org/10.3390/en10050649
ISSN: 1996-1073
Publisher: MDPI
Journal / Book Title: Energies
Volume: 10
Copyright Statement: © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/P004709/1
Keywords: Science & Technology
Technology
Energy & Fuels
waste heat recovery
electric arc furnace
organic Rankine cycle
case study
LOW-GRADE HEAT
WORKING FLUID SELECTION
THERMODYNAMIC CYCLES
POWER-GENERATION
ENERGY
OPTIMIZATION
SYSTEM
PERFORMANCE
ENGINE
UK
09 Engineering
02 Physical Sciences
Publication Status: Published
Article Number: 649
Appears in Collections:Faculty of Engineering
Chemical Engineering



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