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Pilot study on jetting pre-oxidation fluidized bed gasification adapting to caking coal

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  • Zhang, Juwei
  • Zhao, Zhigang
  • Zhang, Guangyi
  • Xi, Zeng
  • Zhao, Feixiang
  • Dong, Li
  • Xu, Guangwen

Abstract

Caking coal is difficult to be gasified in fluidized bed (FB) because of the inevitable particle agglomeration caused by caking in the dense bottom of the bed. Literature studies have shown that pre-oxidizing the coal can suppress its caking propensity, while quick dispersion of coal particles, for example, by gas jetting in the plastic stage of heating is critical to such a suppression of the caking agglomeration. Thus, the so-called jetting pre-oxidation fluidized bed gasification (JPFBG) is devised in this study to gasify caking coal in FB. Coal particles usually below 5mm are blown into the space above the bottom dense bed surface by an O2-containing gas jet to disperse and meanwhile to pre-oxidize the particles. The resulting char particles with little, even without caking propensity fall into the dense bottom of the bed to allow their gasification there. After validating the destruction of caking agglomeration by jetting pre-oxidation in a laboratory FB apparatus, a 150kg/h pilot JPFBG plant was built and the coal with the caking index of about 20 was successfully gasified in this plant using normal air and O2-enriched air. The heating vale of the produced gas varied in 2.9–5.0MJ/mN3 and decreased with raising the oxygen percentage applied to the jet feeding. Raising the oxygen percentage for the jet caused more of the produced gas formed in the bottom dense bed of char gasification to burn off in the jetting zone. The optimal proportion of the oxygen applied to the jet feeding or coal pre-oxidation was found to be about 37% against the total oxygen supply. Enriching the O2 content in the gasification agent to about 30vol.% enhanced greatly the gasification rate of the tested low-reactivity coal in JPFB.

Suggested Citation

  • Zhang, Juwei & Zhao, Zhigang & Zhang, Guangyi & Xi, Zeng & Zhao, Feixiang & Dong, Li & Xu, Guangwen, 2013. "Pilot study on jetting pre-oxidation fluidized bed gasification adapting to caking coal," Applied Energy, Elsevier, vol. 110(C), pages 276-284.
    • Handle: RePEc:eee:appene:v:110:y:2013:i:c:p:276-284
    DOI: 10.1016/j.apenergy.2013.04.057
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    References listed on IDEAS

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    1. Ahmed, I.I. & Gupta, A.K., 2011. "Kinetics of woodchips char gasification with steam and carbon dioxide," Applied Energy, Elsevier, vol. 88(5), pages 1613-1619, May.
    2. Ngo, Son Ich & Nguyen, Thanh D.B. & Lim, Young-Il & Song, Byung-Ho & Lee, Uen-Do & Choi, Young-Tai & Song, Jae-Hun, 2011. "Performance evaluation for dual circulating fluidized-bed steam gasifier of biomass using quasi-equilibrium three-stage gasification model," Applied Energy, Elsevier, vol. 88(12), pages 5208-5220.
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    1. Samiran, Nor Afzanizam & Jaafar, Mohammad Nazri Mohd & Ng, Jo-Han & Lam, Su Shiung & Chong, Cheng Tung, 2016. "Progress in biomass gasification technique – With focus on Malaysian palm biomass for syngas production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 62(C), pages 1047-1062.
    2. Wang, Fang & Zeng, Xi & Sun, Yanlin & Zhang, Juwei & Zhao, Zhigang & Wang, Yonggang & Xu, Guangwen, 2015. "Jetting pre-oxidation fluidized bed gasification process for caking coal: Fundamentals and pilot test," Applied Energy, Elsevier, vol. 160(C), pages 80-87.
    3. Guo, Zhihang & Wang, Qinhui & Fang, Mengxiang & Luo, Zhongyang & Cen, Kefa, 2014. "Thermodynamic and economic analysis of polygeneration system integrating atmospheric pressure coal pyrolysis technology with circulating fluidized bed power plant," Applied Energy, Elsevier, vol. 113(C), pages 1301-1314.
    4. Baloyi, J. & Bello-Ochende, T. & Meyer, J.P., 2014. "Thermodynamic optimisation and computational analysis of irreversibilities in a small-scale wood-fired circulating fluidised bed adiabatic combustor," Energy, Elsevier, vol. 70(C), pages 653-663.
    5. Yi, Qun & Wu, Guo-sheng & Gong, Min-hui & Huang, Yi & Feng, Jie & Hao, Yan-hong & Li, Wen-ying, 2017. "A feasibility study for CO2 recycle assistance with coke oven gas to synthetic natural gas," Applied Energy, Elsevier, vol. 193(C), pages 149-161.

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