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Tech-economical analysis of waste heat recovery and utilization at Ruukki metals, Raahe steelworks
RISE, Swerea, Swerea MEFOS.
Rautaruukki Oyj.
2010 (English)In: Proceedings of the 23rd International Conference on Efficiency, Cost, Optimization, Simulation, and Environmental Impact of Energy Systems, ECOS 2010, Aabo Akademi University , 2010, Vol. 4, 115-122 p.Conference paper, Published paper (Refereed)
Abstract [en]

Steel industry is one of energy-intensive industries. Recovery and utilization of waste heat is important for reduction of energy consumption in the steel industry. Waste heat occurs in every plant of iron and steel works in the form of gases, liquid and solid. In this work, the waste heat considered is the flue gases from various process units. The studied steel works is Raahe steelworks (Ruukki), which is a fully integrated steel plant. The major process units to generate flue gases at Ruukki are batteries at coking plant, cowper at iron making plant and heat furnaces at the rolling mill. The flue gas temperatures are in the range of 230 ~ 550 °C, and the flow rates are in the range of 25000 ~ 127000 Nm3/hour at each stack. The potential thermal energy recovered at each unit is calculated. Organic Rankine Cycle (ORC) technique has been applied for electricity generation from the recovered waste heat. Some economical parameters such as net present value (NPV), Internal return rate (IRR) and pay-back time are presented to show projects' economical feasibility. Sensitivity analysis of some key influence factors, such as equipment cost, electricity price and discount rate, etc. has been made. Furthermore, a concept of optimized use of waste heat from an integrated point of view has been studied, in which the power plant is also covered. Analysis and discussions on how to utilize waste heat to produce steam or electricity towards a more economical solution are presented.

Place, publisher, year, edition, pages
Aabo Akademi University , 2010. Vol. 4, 115-122 p.
Keyword [en]
Organic rankine cycle (ORC), Steelworks, Waste heat recovery
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13486Scopus ID: 2-s2.0-84896080196ISBN: 9781456303181 (print)OAI: oai:DiVA.org:ri-13486DiVA: diva2:973695
Conference
23rd International Conference on Efficiency, Cost, Optimization, Simulation, and Environmental Impact of Energy Systems, ECOS 2010
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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CiteExportLink to record
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