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The role of limestone during fluidized bed oxy-combustion of coal and biomass

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  • Lupiáñez, Carlos
  • Carmen Mayoral, M.
  • Díez, Luis I.
  • Pueyo, Eloy
  • Espatolero, Sergio
  • Manuel Andrés, J.

Abstract

The interest in bio-CCS technologies is growing due to their potential to reduce CO2 emission in power generation. Oxy-co-firing in fluidized-bed units is one of the available techniques to develop bio-CCS, offering wide fuel flexibility and low SO2 and NOx emissions. This paper discusses the results of an experimental campaign carried out in a lab-scale fluidized bed reactor. The work focuses on the influence of limestone when oxy-firing blends of lignite and corn stover. Two different types of limestone with two Ca:S molar ratios were tested, and operational conditions were selected to compare the mechanisms governing desulphurization. Emissions of SO2, NO and HCl, together with deposition rates and ash mineralogy are studied in the paper. SO2 capture increases with the Ca:S ratio and bed temperature, but to a different extent depending on the limestone fragmentation. The amount of NO emitted rises with the Ca:S ratio and the presence of calcined limestone (indirect desulphurization). The HCl concentration in the gas phase is dominated by alkali sulfation. Finally, the conditions for the highest desulphurization efficiency diminished the deposition rates, but increased the risk for chlorine-induced corrosion.

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  • Lupiáñez, Carlos & Carmen Mayoral, M. & Díez, Luis I. & Pueyo, Eloy & Espatolero, Sergio & Manuel Andrés, J., 2016. "The role of limestone during fluidized bed oxy-combustion of coal and biomass," Applied Energy, Elsevier, vol. 184(C), pages 670-680.
    • Handle: RePEc:eee:appene:v:184:y:2016:i:c:p:670-680
    DOI: 10.1016/j.apenergy.2016.11.018
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