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

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 investi...

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Veröffentlicht in:Energy (Oxford) 2018-07, Vol.155, p.381-391
Hauptverfasser: Gaber, Christian, Demuth, Martin, Prieler, René, Schluckner, Christoph, Hochenauer, Christoph
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Sprache:eng
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Zusammenfassung: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. •Bi-reforming of methane using CO2 and H2O with a steam to carbon ratio of 0.5.•Tri-reforming of methane using O2, CO2 and H2O with a steam to carbon ratio of 0.4.•Reduction of carbon formation as a result of regenerative bi-reforming.•Investigation of the temperature profile and cycle time of a TCR reformer unit.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2018.04.154