Korean Chemical Engineering Research

  • 제54권5호
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  • Pages.659-664
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  • 2016
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  • 0304-128X(pISSN)
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  • 2233-9558(eISSN)
한국화학공학회 (The Korean Institute of Chemical Engineers)
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Migration of Alkali and Alkaline Earth Metallic Species and Structure Analysis of Sawdust Pyrolysis Biochar

  • Zhao, Yijun (School of Energy Science and Engineering, Harbin Institute of Technology) ;
  • Feng, Dongdong (School of Energy Science and Engineering, Harbin Institute of Technology) ;
  • Zhang, Yu (School of Energy Science and Engineering, Harbin Institute of Technology) ;
  • Tang, Wenbo (School of Energy Science and Engineering, Harbin Institute of Technology) ;
  • Meng, Shun (School of Energy Science and Engineering, Harbin Institute of Technology) ;
  • Guo, Yangzhou (School of Energy Science and Engineering, Harbin Institute of Technology) ;
  • Sun, Shaozeng (School of Energy Science and Engineering, Harbin Institute of Technology)
  • 투고 : 2016.03.13
  • 심사 : 2016.06.16
  • 발행 : 2016.10.01
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초록

In order to resolve the AAEM species migration routes and the interaction relationship between biochar structure and AAEM species during biomass pyrolysis, experiments were performed in an entrained flow reactor with $N_2$ at $500{\sim}900^{\circ}C$. ICP-AES, XPS and SEM-EDX were used to examine content and distribution of AAEM species and the physicochemical structures of biochar. The results show that at $500{\sim}700^{\circ}C$, the precipitation rate of AAEM species is relatively high. At high temperature (>$700^{\circ}C$), the AAEM species continue to migrate from interior to exterior, but little precipitation from biochar surface. And the migration of AAEM species is mainly realized by the C-O bond as the carrier medium. The AAEM species on biochar surface are mainly Na, Mg and Ca (<$700^{\circ}C$), while changing to K, Mg and Ca (${\geq}700^{\circ}C$). From $500^{\circ}C$ to $900^{\circ}C$, the biochar particle morphology gradually changes from fibers to porous structures, finally to molten particles. At $700{\sim}900^{\circ}C$, Ca element is obviously enriched on the molten edge of the biochar porous structures.

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피인용 문헌

  1. Comprehensive study on the influence of preparation conditions on the physicochemical structure of char and the adaptability of the char reactivity model vol.431, pp.p1, 2022, https://doi.org/10.1016/j.cej.2021.133903