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NO emissions in oxy‐coal combustion with the addition of steam in an entrained flow reactor

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  • Lucia Álvarez
  • Juan Riaza
  • Maria V. Gil
  • Covadonga Pevida
  • José J. Pis
  • Fernando Rubiera

Abstract

The NO emissions of a semi‐anthracite and a high‐volatile bituminous coal were studied under oxy‐fuel combustion conditions in an entrained flow reactor (EFR). The results obtained under oxy‐fuel atmospheres (21%O 2 –79%CO 2 , 30%O 2 –70%CO 2 and 35%O 2 –65%CO 2 ), were compared with those produced in air. The replacement of CO 2 by 5, 10, and 20% of steam in the oxy‐fuel combustion atmospheres was also evaluated in order to study the wet recirculation of flue gas. The NO emissions during oxy‐fuel combustion were lower than those in air‐firing, and a slight increasing trend in NO emissions was observed as O 2 concentrations in the oxy‐fuel atmospheres increased. Similarly, the NO concentration was reduced by the addition of steam, both under air and under oxy‐fuel atmospheres, but no relevant differences between the different steam concentrations were observed. © 2011 Society of Chemical Industry and John Wiley & Sons, Ltd

Suggested Citation

  • Lucia Álvarez & Juan Riaza & Maria V. Gil & Covadonga Pevida & José J. Pis & Fernando Rubiera, 2011. "NO emissions in oxy‐coal combustion with the addition of steam in an entrained flow reactor," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 1(2), pages 180-190, June.
    • Handle: RePEc:wly:greenh:v:1:y:2011:i:2:p:180-190
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    1. Gil, M.V. & Riaza, J. & Álvarez, L. & Pevida, C. & Pis, J.J. & Rubiera, F., 2012. "Kinetic models for the oxy-fuel combustion of coal and coal/biomass blend chars obtained in N2 and CO2 atmospheres," Energy, Elsevier, vol. 48(1), pages 510-518.
    2. Díez, Luis I. & García-Mariaca, Alexander & Canalís, Paula & Llera, Eva, 2023. "Oxy-combustion characteristics of torrefied biomass and blends under O2/N2, O2/CO2 and O2/CO2/H2O atmospheres," Energy, Elsevier, vol. 284(C).
    3. Riaza, J. & Gil, M.V. & Álvarez, L. & Pevida, C. & Pis, J.J. & Rubiera, F., 2012. "Oxy-fuel combustion of coal and biomass blends," Energy, Elsevier, vol. 41(1), pages 429-435.
    4. Kim, Seong-Ju & Park, Sung-Jin & Jo, Sung-Ho & Lee, Hookyung & Yoon, Sang-Jun & Moon, Ji-Hong & Ra, Ho-Won & Yoon, Sung-Min & Lee, Jae-Goo & Mun, Tae-Young, 2023. "Effects of ammonia co-firing ratios and injection positions in the coal–ammonia co-firing process in a circulating fluidized bed combustion test rig," Energy, Elsevier, vol. 282(C).
    5. Wang, Zhuozhi & Sun, Rui & Zhao, Yaying & Li, Yupeng & Ren, Xiaohan, 2019. "Effect of steam concentration on demineralized coal char surface behaviors and structural characteristics during the oxy-steam combustion process," Energy, Elsevier, vol. 174(C), pages 339-349.
    6. Gaber, Christian & Schluckner, Christoph & Wachter, Philipp & Demuth, Martin & Hochenauer, Christoph, 2021. "Experimental study on the influence of the nitrogen concentration in the oxidizer on NOx and CO emissions during the oxy-fuel combustion of natural gas," Energy, Elsevier, vol. 214(C).

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