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Effect of oxy-fuel combustion with steam addition on coal ignition and burnout in an entrained flow reactor

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  • Riaza, J.
  • Álvarez, L.
  • Gil, M.V.
  • Pevida, C.
  • Pis, J.J.
  • Rubiera, F.

Abstract

The ignition temperature and burnout 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%O2–79%CO2, 30%O2–70% O2 and 35%O2–65%CO2) were compared with those attained in air. The replacement of CO2 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. For the 21%O2–79%CO2 atmosphere, the results indicated that the ignition temperature was higher and the coal burnout was lower than in air. However, when the O2 concentration was increased to 30 and 35% in the oxy-fuel combustion atmosphere, the ignition temperature was lower and coal burnout was improved in comparison with air conditions. On the other hand, an increase in ignition temperature and a worsening of the coal burnout was observed when steam was added to the oxy-fuel combustion atmospheres though no relevant differences between the different steam concentrations were detected.

Suggested Citation

  • Riaza, J. & Álvarez, L. & Gil, M.V. & Pevida, C. & Pis, J.J. & Rubiera, F., 2011. "Effect of oxy-fuel combustion with steam addition on coal ignition and burnout in an entrained flow reactor," Energy, Elsevier, vol. 36(8), pages 5314-5319.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:8:p:5314-5319
    DOI: 10.1016/j.energy.2011.06.039
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    7. Álvarez, L. & Yin, C. & Riaza, J. & Pevida, C. & Pis, J.J. & Rubiera, F., 2013. "Oxy-coal combustion in an entrained flow reactor: Application of specific char and volatile combustion and radiation models for oxy-firing conditions," Energy, Elsevier, vol. 62(C), pages 255-268.
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    11. Mao, Zhihui & Zhang, Liqi & Zhu, Xinyang & Pan, Cong & Yi, Baojun & Zheng, Chuguang, 2016. "Modeling of an oxy-coal flame under a steam-rich atmosphere," Applied Energy, Elsevier, vol. 161(C), pages 112-123.
    12. Zhou, Kun & Lin, Qizhao & Hu, Hongwei & Hu, Huiqing & Song, Lanbo, 2017. "The ignition characteristics and combustion processes of the single coal slime particle under different hot-coflow conditions in N2/O2 atmosphere," Energy, Elsevier, vol. 136(C), pages 173-184.
    13. Yi, Baojun & Zhang, Liqi & Huang, Fang & Mao, Zhihui & Zheng, Chuguang, 2014. "Effect of H2O on the combustion characteristics of pulverized coal in O2/CO2 atmosphere," Applied Energy, Elsevier, vol. 132(C), pages 349-357.
    14. Wang, Wenyu & Li, Wei & Liang, Chen & Lu, Yu & Guo, Shuai & Ren, Qiangqiang, 2024. "Resource utilization of gasified fine ash from entrained flow bed via thermal modification-melting combustion: A pilot study," Energy, Elsevier, vol. 299(C).
    15. 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.
    16. Wang, Guoqiang & Wang, Feng & Li, Longjian & Zhang, Guofu, 2013. "Experiment of catalyst activity distribution effect on methanol steam reforming performance in the packed bed plate-type reactor," Energy, Elsevier, vol. 51(C), pages 267-272.
    17. Yin, Chungen & Yan, Jinyue, 2016. "Oxy-fuel combustion of pulverized fuels: Combustion fundamentals and modeling," Applied Energy, Elsevier, vol. 162(C), pages 742-762.
    18. Oh, Jeongseog & Noh, Dongsoon, 2012. "Laminar burning velocity of oxy-methane flames in atmospheric condition," Energy, Elsevier, vol. 45(1), pages 669-675.
    19. Mostafa, Mohamed E. & He, Limo & Xu, Jun & Hu, Song & Wang, Yi & Su, Sheng & Hu, Xun & Elsayed, Saad A. & Xiang, Jun, 2019. "Investigating the effect of integrated CO2 and H2O on the reactivity and kinetics of biomass pellets oxy-steam combustion using new double parallel volumetric model (DVM)," Energy, Elsevier, vol. 179(C), pages 343-357.
    20. Gil, María V. & Riaza, Juan & Álvarez, Lucía & Pevida, Covadonga & Rubiera, Fernando, 2015. "Biomass devolatilization at high temperature under N2 and CO2: Char morphology and reactivity," Energy, Elsevier, vol. 91(C), pages 655-662.

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