Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Holdup Characteristics of Small Bubbles in a Viscous Slurry Bubble Column

점성슬러리 기포탑에서 작은 기포의 체류량 특성

  • Jin, Hae-Ryong (School of Chemical Engineering, Chungnam National University) ;
  • Song, Yang-Ho (School of Chemical Engineering, Chungnam National University) ;
  • Kang, Yong (School of Chemical Engineering, Chungnam National University) ;
  • Jung, Heon (Synfuel Research Group, Korea Institute of Energy Research) ;
  • Lee, Ho-Tae (Synfuel Research Group, Korea Institute of Energy Research)
  • 진해룡 (충남대학교 화학공학과) ;
  • 송양호 (충남대학교 화학공학과) ;
  • 강용 (충남대학교 화학공학과) ;
  • 정헌 (한국에너지기술연구원) ;
  • 이호태 (한국에너지기술연구원)
  • Published : 2011.01.30
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Abstract

Holdup characteristics of small bubbles were investigated in a viscous slurry bubble column. The phase holdup of small bubbles was obtained from the knowledge of total bubble(gas) holdup and large bubble holdup, which were measured by mean of static pressure drop method and dual resistivity probe method, respectively. Effects of gas velocity, viscosity of continuous liquid phase and solid fraction in the slurry phase on the small bubble holdup as well as holdups of total bubble(gas) and large bubble in a viscous slurry bubble column. The small bubble holdup increased with increasing gas velocity but decreased with increasing liquid viscosity or solid fraction in the slurry phase. In addition the fraction of small bubble in the total bubble(gas) holdup increased with increasing gas velocity but decreased with increasing liquid viscosity or solid fraction in the slurry phase. It was revealed that the rising velocity of large bubble did not related to the holdup of small bubble in a viscous slurry bubble column.

점성슬러리 기포탑에서 작은 기포의 체류량 특성에 대해 고찰하였다. 정압 강하방법(Static pressure drop method)에 의해 구한 기포탑 내부전체 기포체류량과 이중저항탐침법(dual resistivity probe method)에 의해 구한 큰 기포의 체류량으로부터 기포탑 내부에 체류하는 작은 기포의 체류량을 구할 수 있었다. 기체유속, 연속액상의 점도 그리고 슬러리 상중에 포함된 고체입자의 분율이 전체 기체체류량, 큰 기포의 체류량 그리고 작은 기포의 체류량에 미치는 영향을 검토하였다. 점성슬러리 기포탑에서 작은 기포의 체류량은 기체의 유속이 증가하면 증가하였으나 연속액상의 점도와 슬러리상에 포함된 고체입자의 분율이 증가하면 감소하였다. 기포탑 내부에 체류하는 전체 기포 체류량 중 작은 기포 체류량의 분율은 기체유속이 증가하면 증가하였으나 연속액상의 점도와 슬러리상에 포함된 고체입자의 분율이 증가하면 감소하였다. 기포탑 내부에 체류하는 작은 기포는 큰 기포의 상승속도에 영향을 미치지 못하였다.

Keywords

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  3. Analysis of Bubble Holdup Structure in Viscose Three-Phase Fluidized Beds vol.45, pp.9, 2012, https://doi.org/10.1252/jcej.12we058