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Investigation of the fate of nitrogen in chemical looping combustion of gaseous fuels using two different oxygen carriers

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  • Pachler, Robert F.
  • Penthor, Stefan
  • Mayer, Karl
  • Hofbauer, Hermann

Abstract

The influence of nitrogenous fuel impurities in a 120 kWth chemical looping combustion pilot unit was investigated. Two oxygen carriers were used. An in industrial scale produced perovskite type CaMn0·775Mg0·1Ti0·125O3-δ, called C28 and a copper based oxygen carrier (Cu15) prepared by impregnation were applied. Natural gas was used as fuel and ammonia (NH3) were added as a model NOX precursor up to a fuel-N content of 1.4 wt%, to investigate the path of nitrogen and emissions of nitrogen oxides. The exhaust gas streams of air and fuel reactor were analyzed against NH3 and NOX. The two oxygen carriers performed differently in the presence of NH3 in the fuel feed. While the general fuel conversion performance of both oxygen carriers were not affected, the NH3 conversion with C28 was only around 72% in the fuel reactor, full NH3 conversion was measured with Cu15. During the experiments with C28, NOX emissions in form of NO occurred in the fuel reactor, opposite to this no NOX have been detected while using Cu15. During all experiments no NOX was observed in the air reactor exhaust gas stream. A regeneration during CLC operation after switching off the ammonia feed was possible.

Suggested Citation

  • Pachler, Robert F. & Penthor, Stefan & Mayer, Karl & Hofbauer, Hermann, 2020. "Investigation of the fate of nitrogen in chemical looping combustion of gaseous fuels using two different oxygen carriers," Energy, Elsevier, vol. 195(C).
    • Handle: RePEc:eee:energy:v:195:y:2020:i:c:s0360544220300335
    DOI: 10.1016/j.energy.2020.116926
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    References listed on IDEAS

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    1. Lyngfelt, Anders, 2014. "Chemical-looping combustion of solid fuels – Status of development," Applied Energy, Elsevier, vol. 113(C), pages 1869-1873.
    2. Mayer, Karl & Penthor, Stefan & Pröll, Tobias & Hofbauer, Hermann, 2015. "The different demands of oxygen carriers on the reactor system of a CLC plant – Results of oxygen carrier testing in a 120kWth pilot plant," Applied Energy, Elsevier, vol. 157(C), pages 323-329.
    3. Penthor, Stefan & Zerobin, Florian & Mayer, Karl & Pröll, Tobias & Hofbauer, Hermann, 2015. "Investigation of the performance of a copper based oxygen carrier for chemical looping combustion in a 120kW pilot plant for gaseous fuels," Applied Energy, Elsevier, vol. 145(C), pages 52-59.
    4. Bayham, Samuel & McGiveron, Omar & Tong, Andrew & Chung, Elena & Kathe, Mandar & Wang, Dawei & Zeng, Liang & Fan, Liang-Shih, 2015. "Parametric and dynamic studies of an iron-based 25-kWth coal direct chemical looping unit using sub-bituminous coal," Applied Energy, Elsevier, vol. 145(C), pages 354-363.
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    Cited by:

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