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Reaction process and characteristics for coal char gasification under changed CO2/H2O atmosphere in various reaction stages

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  • Zhang, Zihang
  • Yi, Baojun
  • Sun, Zhengshuai
  • Zhang, Qi
  • Feng, He
  • Hu, Hongyun
  • Huang, Xiangguo
  • Zhao, Chunqing

Abstract

During the operation of industrial gasifier, the concentrations of CO2 and H2O in gasification media vary with the change of stages, causing the gasification process being affected accordingly. Therefore, dividing the gasification process into different stages to study the effect of multi-stage switching atmosphere is significant. The conversion rate, reaction characteristics and reaction process for the gasification of Xiaolongtan (XLT) coal char in different atmospheres (CO2/H2O/N2) switching in the early, middle and late reaction stages were investigated using thermo-gravimetric analysis (TGA). The results indicated that the average reaction rate of coal char with H2O was approximately 3 times that of CO2. Increasing H2O concentration improved the reaction and conversion rate of coal char, which was the most obvious in the early stage. With the H2O concentration increasing from 0 to 95%, the increment of conversion rate in the early, middle, and late stages were 7.13%, 4.40%, and 3.92%, respectively. Thus, considering the problem of H2O corrosion in practical production, the H2O concentration could be appropriately increased in the early stage to improve efficiency. Compared with the random pore model, the shrinking core model fitted the gasification process of coal char better in a highly reactive 95% H2O/5% N2 atmosphere.

Suggested Citation

  • Zhang, Zihang & Yi, Baojun & Sun, Zhengshuai & Zhang, Qi & Feng, He & Hu, Hongyun & Huang, Xiangguo & Zhao, Chunqing, 2021. "Reaction process and characteristics for coal char gasification under changed CO2/H2O atmosphere in various reaction stages," Energy, Elsevier, vol. 229(C).
    • Handle: RePEc:eee:energy:v:229:y:2021:i:c:s0360544221009269
    DOI: 10.1016/j.energy.2021.120677
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    References listed on IDEAS

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    1. Bai, Yonghui & Wang, Yulong & Zhu, Shenghua & Li, Fan & Xie, Kechang, 2014. "Structural features and gasification reactivity of coal chars formed in Ar and CO2 atmospheres at elevated pressures," Energy, Elsevier, vol. 74(C), pages 464-470.
    2. Guizani, Chamseddine & Jeguirim, Mejdi & Gadiou, Roger & Escudero Sanz, Fransisco Javier & Salvador, Sylvain, 2016. "Biomass char gasification by H2O, CO2 and their mixture: Evolution of chemical, textural and structural properties of the chars," Energy, Elsevier, vol. 112(C), pages 133-145.
    3. 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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    1. Huang, Xiaohong & Hu, Fan & Liu, Xuhui & Liu, Zhaohui, 2022. "Structure and reactivity of chars prepared from low-volatile coal under O2/N2 and O2/CO2 conditions in a flat-flame assisted entrained flow reactor," Energy, Elsevier, vol. 261(PB).
    2. Zhang, Wenqi & Zhou, Renjie & Gao, Shuaifei & Wang, Yinfeng & Zhu, Lin & Gao, Ying & Zhu, Yuezhao, 2022. "Investigation on cogasification and melting behavior of ash-rich biomass solid waste and Ca-rich petrochemical sludge pyrolysis residue in CO2 atmosphere," Energy, Elsevier, vol. 239(PB).
    3. Shevyrev, S.A. & Mazheiko, N.E. & Yakutin, S.K. & Strizhak, P.A., 2022. "Investigation of characteristics of gas and coke residue for the regime of quasi- and non-stationary steam gasification of coal in a fluidized bed: Part 1," Energy, Elsevier, vol. 251(C).

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