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

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

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.

Suggested Citation

  • Gaber, Christian & Demuth, Martin & Prieler, René & Schluckner, Christoph & Hochenauer, Christoph, 2018. "An experimental study of a thermochemical regeneration waste heat recovery process using a reformer unit," Energy, Elsevier, vol. 155(C), pages 381-391.
    • Handle: RePEc:eee:energy:v:155:y:2018:i:c:p:381-391
    DOI: 10.1016/j.energy.2018.04.154
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    References listed on IDEAS

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    1. Carminati, Hudson Bolsoni & de Medeiros, José Luiz & Araújo, Ofélia de Queiroz F., 2021. "Sustainable Gas-to-Wire via dry reforming of carbonated natural gas: Ionic-liquid pre-combustion capture and thermodynamic efficiency," Renewable and Sustainable Energy Reviews, Elsevier, vol. 151(C).
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    3. Li, Xin & Zhang, Silong & Ye, Mai & Qin, Jiang & Bao, Wen & Cui, Naigang & Liu, Xiaoyong & Zhou, Chaoying, 2020. "Effect of enhanced heat transfer structures on the chemical recuperation process of advanced aero-engine," Energy, Elsevier, vol. 211(C).
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    6. Samira Soleimani & Markus Lehner, 2022. "Tri-Reforming of Methane: Thermodynamics, Operating Conditions, Reactor Technology and Efficiency Evaluation—A Review," Energies, MDPI, vol. 15(19), pages 1-40, September.
    7. Wachter, Philipp & Gaber, Christian & Demuth, Martin & Hochenauer, Christoph, 2020. "Experimental investigation of tri-reforming on a stationary, recuperative TCR-reformer applied to an oxy-fuel combustion of natural gas, using a Ni-catalyst," Energy, Elsevier, vol. 212(C).
    8. Pashchenko, Dmitry & Makarov, Ivan, 2021. "Carbon deposition in steam methane reforming over a Ni-based catalyst: Experimental and thermodynamic analysis," Energy, Elsevier, vol. 222(C).
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    12. Pashchenko, Dmitry & Karpilov, Igor & Polyakov, Mikhail & Popov, Stanislav K., 2024. "Techno-economic evaluation of a thermochemical waste-heat recuperation system for industrial furnace application: Operating cost analysis," Energy, Elsevier, vol. 295(C).
    13. Gaber, Christian & Demuth, Martin & Prieler, René & Schluckner, Christoph & Schroettner, Hartmuth & Fitzek, Harald & Hochenauer, Christoph, 2019. "Experimental investigation of thermochemical regeneration using oxy-fuel exhaust gases," Applied Energy, Elsevier, vol. 236(C), pages 1115-1124.
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