한국연소학회지 (Journal of the Korean Society of Combustion)

  • 제22권4호
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  • Pages.19-26
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  • 2017
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  • 1226-0959(pISSN)
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  • 2466-2089(eISSN)
한국연소학회 (The Korean Society of Combustion)
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가압 DTF를 이용한 석탄 촤-CO2 가스화 반응상수 도출

Deriving the Rate Constants of Coal Char-CO2 Gasification using Pressurized Drop Tube Furnace

  • 손근 (성균관대학교 기계공학부) ;
  • 예인수 (성균관대학교 기계공학부) ;
  • 라호원 (한국에너지기술연구원 청정연료연구실) ;
  • 윤성민 (한국에너지기술연구원 청정연료연구실) ;
  • 류창국 (성균관대학교 기계공학부)
  • Sohn, Geun (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Ye, Insoo (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Ra, Howon (Clean Fuel Department, Korea Institute of Energy Reasearch) ;
  • Yoon, Sungmin (Clean Fuel Department, Korea Institute of Energy Reasearch) ;
  • Ryu, Changkook (School of Mechanical Engineering, Sungkyunkwan University)
  • 투고 : 2016.11.21
  • 심사 : 2017.11.22
  • 발행 : 2017.12.30
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초록

This study investigates the gasification of coal char by $CO_2$ under high pressures in a drop tube furnace(DTF). The rate constants are derived for the shrinking core model using the conventional method based on the set reactor conditions. The computational fluid dynamic(CFD) simulations adopting the rate constants revealed that the carbon conversion was much slower than the experimental results, especially under high temperature and high partial pressure of reactants. Three reasons were identified for the discrepancy: i) shorter reaction time because of the entry region for heating, ii) lower particle temperature by the endothermic reaction, and iii) lower partial pressure of $CO_2$ by its consumption. Therefore, the rate constants were corrected based on the actual reaction conditions of the char. The CFD results updated using the corrected rate constants well matched with the measured values. Such correction of reaction conditions in a DTF is essential in deriving rate constants for any char conversion models by $H_2O$ and $O_2$ as well as $CO_2$.

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