Metal Scrap Preheating using Flue Gas Waste Heat

Thomas Arink, Mohamed I. Hassan

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations

Abstract

The implementation of solid scrap preheating furnaces in the metal industry, powered by waste heat, has been a subject of interest due to the economic and energy saving benefits. Metal holding furnaces, keeping metal in a liquid state before casting, are powered by natural gas burners. Flue gases exit the furnaces at temperatures higher than the melting temperature of the metal, and it carries a significant amount of exergy that is considered as losses. By directing hot flue gases from the holding furnace to a metal scrap preheating furnace, one can heat up solid-scrap profiles, which are to be remelted, before putting them in the melting furnace. Adding a preheating step will reduce the melting time required while saving energy. The aim of this study is to look at the effectiveness of heating sow profiles with hot flue gases and find the optimal design considerations for a preheating furnace. Turbulent fluid flow and heat transfer physics are coupled in a CFD model to predict the sow average and maximum temperature with time for specific flue gas flow rate.

Original languageBritish English
Pages (from-to)4788-4795
Number of pages8
JournalEnergy Procedia
Volume105
DOIs
StatePublished - 2017
Event8th International Conference on Applied Energy, ICAE 2016 - Beijing, China
Duration: 8 Oct 201611 Oct 2016

Keywords

  • CFD
  • flue gas
  • metal holding furnace
  • scrap preheating
  • waste heat recovery

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