An experimental study of a thermochemical regeneration waste heat recovery process using a reformer unit

Christian Gaber*, Martin Demuth, René Prieler, Christoph Schluckner, Christoph Hochenauer

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

This paper presents a thermochemical regenerative heat recovery process for utilizing the waste heat of oxy-fuel furnaces, with three significant modifications compared to current state-of-the-art reforming concepts. (I) Experimental tests with a reformer test rig were performed, in order to investigate the bi-reforming of methane into syngas by using water and carbon dioxide with a steam-to-carbon ratio of 0.5. The measured syngas concentrations were compared to calculated equilibrium values and carbon deposits were determined. A methane conversion rate of 95.3% was achieved. (II) Carbon deposits in a regenerator bed are usually burned with purge gases. In contrast to this procedure, oxygen was added to the fuel/exhaust gas mixture in order to cause tri-reforming of methane with a steam-to-carbon ratio of 0.4. The syngas concentrations were compared to equilibrium values and it was found, that tri-reforming significantly reduces carbon formation. A methane conversion rate of 96.7% was achieved. (III) Furthermore, reforming and regeneration cycles were coupled and it was found that the temperature profile within the TCR regenerator bed material varies greatly from that of a common regenerator. Regeneration with water and carbon dioxide was sufficient to eliminate all carbon deposits.

Original languageEnglish
Pages (from-to)381-391
Number of pages11
JournalEnergy
Volume155
DOIs
Publication statusPublished - 15 Jul 2018

Keywords

  • Bi- and tri-reforming of methane
  • Carbon formation
  • Oxy-fuel furnace
  • Syngas
  • Thermochemical regeneration
  • Waste heat recovery

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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