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Combustion Characteristics of Single Particles from Bituminous Coal and Pine Sawdust in O 2 /N 2 , O 2 /CO 2 , and O 2 /H 2 O Atmospheres

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  • Kai Lei

    (Ministry of Industry and Information Technology Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
    Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China)

  • Buqing Ye

    (Ministry of Industry and Information Technology Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
    Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China)

  • Jin Cao

    (Ministry of Industry and Information Technology Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
    Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China)

  • Rui Zhang

    (Ministry of Industry and Information Technology Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
    Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China)

  • Dong Liu

    (Ministry of Industry and Information Technology Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
    Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China)

Abstract

Burning fuels in an O 2 /H 2 O atmosphere is regarded as the next generation of oxy-fuel combustion for CO 2 capture and storage (CCS). By combining oxy-fuel combustion and biomass utilization technology, CO 2 emissions could be further reduced. Therefore, this work focuses on investigating the combustion characteristics of single particles from bituminous coal (BC) and pine sawdust (PS) in O 2 /N 2 , O 2 /CO 2 and O 2 /H 2 O atmospheres at different O 2 mole fractions (21%, 30%, and 40%). The experiments were carried out in a drop tube furnace (DTF), and a high-speed camera was used to record the combustion processes of fuel particles. The combustion temperatures were measured by a two-color method. The results reveal that the particles from BC and PS all ignite homogeneously. Replacing N 2 by CO 2 results in a longer ignition delay time and lower combustion temperatures. After substituting H 2 O for N 2 , the ignition delay time is shortened, which is mainly caused by the steam gasification reaction (C + H 2 O → CO + H 2 ) and steam shift reaction (CO + H 2 O → CO 2 + H 2 ). In addition, the combustion temperatures are first decreased at low O 2 mole fractions, and then increased at high O 2 mole fractions because the oxidation effect of H 2 O performs a more important role than its volumetric heat capacity and thermal radiation capacity. At the same condition, particles from PS ignite earlier because of their higher reactivity, but the combustion temperatures are lower than those of BC, which is owing to their lower calorific values.

Suggested Citation

  • Kai Lei & Buqing Ye & Jin Cao & Rui Zhang & Dong Liu, 2017. "Combustion Characteristics of Single Particles from Bituminous Coal and Pine Sawdust in O 2 /N 2 , O 2 /CO 2 , and O 2 /H 2 O Atmospheres," Energies, MDPI, vol. 10(11), pages 1-12, October.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:11:p:1695-:d:116384
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    Cited by:

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    2. Vadim Dorokhov & Geniy Kuznetsov & Galina Nyashina, 2022. "Combustion of Coal and Coal Slime in Steam-Air Environment and in Slurry Form," Energies, MDPI, vol. 15(24), pages 1-23, December.
    3. Lauri Loo & Alar Konist & Dmitri Neshumayev & Tõnu Pihu & Birgit Maaten & Andres Siirde, 2018. "Ash and Flue Gas from Oil Shale Oxy-Fuel Circulating Fluidized Bed Combustion," Energies, MDPI, vol. 11(5), pages 1-12, May.
    4. Furqan Tahir & Haider Ali & Ahmer A.B. Baloch & Yasir Jamil, 2019. "Performance Analysis of Air and Oxy-Fuel Laminar Combustion in a Porous Plate Reactor," Energies, MDPI, vol. 12(9), pages 1-16, May.
    5. Ming Lei & Cen Sun & Chunbo Wang, 2018. "Techno-Economic Analysis of a 600 MW Oxy-Enrich Pulverized Coal-Fired Boiler," Energies, MDPI, vol. 11(4), pages 1-12, March.

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