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Chemical looping combustion of hard coal in a 1MWth pilot plant using ilmenite as oxygen carrier

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  • Ströhle, Jochen
  • Orth, Matthias
  • Epple, Bernd

Abstract

The application of chemical looping combustion (CLC) for capturing CO2 from coal-fired power plants has the potential of very low efficiency penalty and low CO2 avoidance costs compared with first generation CO2 capture technologies. One important step towards commercial application is the demonstration of the technology in autothermal operation in the scale of 1MWth fuel power. This study presents results of a test campaign in a 1MWth CLC plant with hard coal as fuel and ilmenite as oxygen carrier. The results of a six hours period with two hours of constant coal feeding of 0.5MWth are studied in detail. The fuel reactor was fluidized with steam and CO2, and the start-up propane burner was still in operation at minimum load. The overall air ratio in the fuel reactor was around 0.1. This indicates that the solids circulation was slightly too low to keep the fuel reactor temperature at 900°C. The measured gas concentrations at the fuel reactor exit show that it was possible to gasify coal and to convert the main part of the gasification products by the ilmenite. The oxygen demand was around 20%, which is in line with the experience from the Chalmers 100kWth test rig. The air reactor had to be heated by additional combustion of propane, most probably because the inventory of the air reactor was very low leading to low conversion rates of ilmenite. Hence, autothermal operation was not reached. Improved results can be expected by an increase of the solids inventory in the reactors and by an increase of solids circulation.

Suggested Citation

  • Ströhle, Jochen & Orth, Matthias & Epple, Bernd, 2015. "Chemical looping combustion of hard coal in a 1MWth pilot plant using ilmenite as oxygen carrier," Applied Energy, Elsevier, vol. 157(C), pages 288-294.
    • Handle: RePEc:eee:appene:v:157:y:2015:i:c:p:288-294
    DOI: 10.1016/j.apenergy.2015.06.035
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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. Ströhle, Jochen & Orth, Matthias & Epple, Bernd, 2014. "Design and operation of a 1MWth chemical looping plant," Applied Energy, Elsevier, vol. 113(C), pages 1490-1495.
    3. Ohlemüller, Peter & Alobaid, Falah & Gunnarsson, Adrian & Ströhle, Jochen & Epple, Bernd, 2015. "Development of a process model for coal chemical looping combustion and validation against 100kWth tests," Applied Energy, Elsevier, vol. 157(C), pages 433-448.
    4. Markström, Pontus & Linderholm, Carl & Lyngfelt, Anders, 2014. "Operation of a 100kW chemical-looping combustor with Mexican petroleum coke and Cerrejón coal," Applied Energy, Elsevier, vol. 113(C), pages 1830-1835.
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