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A refined global reaction mechanism for modeling coal combustion under moderate or intense low-oxygen dilution condition

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  • Wang, Feifei
  • Li, Pengfei
  • Mi, Jianchun
  • Wang, Jinbo

Abstract

This study first assessed the performance of four global mechanisms, including the Westbrook and Dryer (WD) and Jones and Lindstedt (JL) mechanisms, and two preliminary refined versions of them (WD1/JL1), for predicting coal combustion under moderate or intense low-oxygen dilution (MILD) in a lab-scale furnace. The WD/WD1 mechanisms could predict coal MILD combustion well, while the other two performed unsatisfactorily as they greatly overestimated the CO levels. A refined global mechanism (RJLM) was then proposed by modifying some sub-reactions of the JL1 mechanism. The applicability of the proposed RJLM was subsequently tested by modeling coal MILD combustion in both lab- and pilot-scale furnaces. Generally, the RJLM can accurately predict the distributions of temperature and major species in either the lab- or pilot-scale furnace than the JL1 mechanism. The results also indicated that low-oxygen coal MILD combustion occurs under a slow-chemistry regime with Da ≈ 1 and Ka > 1. This demonstrates that coal MILD combustion is jointly controlled by the non-ignorable time scales of flow mixing and the chemical reaction. Moreover, as the JL/JL1 mechanisms overestimated the CO levels of coal MILD combustion, they overestimated the predominant role of slow chemistry in coal MILD combustion. In contrast, the RJLM can accurately predict the microscopic characteristics of coal MILD combustion.

Suggested Citation

  • Wang, Feifei & Li, Pengfei & Mi, Jianchun & Wang, Jinbo, 2018. "A refined global reaction mechanism for modeling coal combustion under moderate or intense low-oxygen dilution condition," Energy, Elsevier, vol. 157(C), pages 764-777.
    • Handle: RePEc:eee:energy:v:157:y:2018:i:c:p:764-777
    DOI: 10.1016/j.energy.2018.05.194
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    References listed on IDEAS

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    1. Wang, Feifei & Li, Pengfei & Mei, Zhenfeng & Zhang, Jianpeng & Mi, Jianchun, 2014. "Combustion of CH4/O2/N2 in a well stirred reactor," Energy, Elsevier, vol. 72(C), pages 242-253.
    2. Cheong, Kin-Pang & Li, Pengfei & Wang, Feifei & Mi, Jianchun, 2017. "Emissions of NO and CO from counterflow combustion of CH4 under MILD and oxyfuel conditions," Energy, Elsevier, vol. 124(C), pages 652-664.
    3. Li, Zhiyi & Cuoci, Alberto & Sadiki, Amsini & Parente, Alessandro, 2017. "Comprehensive numerical study of the Adelaide Jet in Hot-Coflow burner by means of RANS and detailed chemistry," Energy, Elsevier, vol. 139(C), pages 555-570.
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    Cited by:

    1. Zeng, Guang & Zhou, Anqi & Fu, Jinming & Ji, Yang, 2022. "Experimental and numerical investigations on NOx formation and reduction mechanisms of pulverized-coal stereo-staged combustion," Energy, Elsevier, vol. 261(PB).
    2. Kuang, Yucheng & He, Boshu & Tong, Wenxiao & Wang, Chaojun & Ying, Zhaoping, 2020. "Effects of oxygen concentration and inlet velocity on pulverized coal MILD combustion," Energy, Elsevier, vol. 198(C).
    3. Xiang Gou & Qiyan Zhang & Yingfan Liu & Zifang Wang & Mulin Zou & Xuan Zhao, 2018. "A Novel Method of Kinetic Analysis and Its Application to Pulverized Coal Combustion under Different Oxygen Concentrations," Energies, MDPI, vol. 11(7), pages 1-15, July.

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