Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Solid Circulation Rate in a Viscous Liquid-Solid Circulating Fluidized Bed

점성유체 액/고 순환유동층에서 입자의 순환속도

  • Hong, Sung Kyu (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Jang, Hyung Ryun (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Lim, Dae Ho (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Yoo, Dong Jun (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Kang, Yong (Department of Chemical Engineering and Applied Chemistry, Chungnam National University)
  • 홍성규 (충남대학교 응용화학공학과) ;
  • 장형륜 (충남대학교 응용화학공학과) ;
  • 임대호 (충남대학교 응용화학공학과) ;
  • 유동준 (충남대학교 응용화학공학과) ;
  • 강용 (충남대학교 응용화학공학과)
  • Received : 2016.02.02
  • Accepted : 2016.08.17
  • Published : 2016.10.01
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Abstract

Characteristics of solid circulation rate in the liquid-solid circulating fluidized beds with viscous liquid medium were investigated. Effects of primary and secondary liquid velocities, particle size, liquid viscosity and height of solid particles piled up in the solid recycle device on the solid circulation rate were considered. The solid circulation rate increased with increasing primary and secondary liquid velocities, liquid viscosity and height of solid particles in the downcommer, but it decreased with increasing particle size. The particle rising velocity in the riser decreased with increasing the ratio of $U_{L1}/U_{L2}$ and particle size. The slip velocity of liquid and particle, $U_L/U_S$, decreased with increasing liquid viscosity but it increased with increasing particle size. The values of solid circulation rate were well correlated in terms of operating variables and dimensionless groups.

점성유체 액체-고체 순환유동층에서 고체순환속도의 특성에 대해 고찰하였다. 주액체유속, 2차액체의 유속, 유동입자의 크기, 액체의 점도 그리고 입자의 재순환을 위한 장치에서 입자 저장층의 높이가 입자의 순환속도에 미치는 영향을 검토하였다. 입자의 순환속도는 주액체의 유속, 2차액체의 유속, 액체의 점도 그리고 입자저장층의 높이가 증가함에 따라 증가하였으나, 유동입자의 크기가 증가함에 따라서는 감소하였다. 순환유동층의 상승관에서 유동입자의 상승속도는 주액체유속과 2차액체의 유속비($U_{L1}/U_{L2}$)와 유동입자의 크기가 증가함에 따라 감소하였다. 상승관에서 입자의 미끄러짐속도 즉, 연속액상의 유속과 유동입자의 상승속도비($U_L/U_S$)는 연속 액상의 점도가 증가함에 따라 감소하였으나, 유동입자의 크기가 증가함에 따라 증가하였다. 본 연구에서 구한 고체 순환속도는 실험변수 및 무차원군의 함수들로 상관식을 얻을 수 있었다.

Keywords

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Cited by

  1. Characteristics of Three-Phase (Gas–Liquid–Solid) Circulating Fluidized Beds vol.51, pp.9, 2018, https://doi.org/10.1252/jcej.17we205
  2. Solid Circulation Rate in a 3-phase (gas/liquid/solid) Viscous Circulating Fluidized Bed vol.56, pp.2, 2016, https://doi.org/10.9713/kcer.2018.56.2.186