Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Comparison of Solid Circulation Characteristics with Change of Lower Loop Seal Geometry in a Circulating Fluidized Bed

순환유동층에서 하부 루프실 형태 변화에 따른 고체순환 특성 비교

  • Lee, Dong-Ho (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Jo, Sung-Ho (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Jin, Gyoung-Tae (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Yi, Chang-Keun (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Ryu, Ho-Jung (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Park, Seung Bin (Department of Chemical and Biomolecular Engineering, KAIST)
  • 이동호 (한국에너지기술연구원 온실가스연구실) ;
  • 조성호 (한국에너지기술연구원 온실가스연구실) ;
  • 진경태 (한국에너지기술연구원 온실가스연구실) ;
  • 이창근 (한국에너지기술연구원 온실가스연구실) ;
  • 류호정 (한국에너지기술연구원 온실가스연구실) ;
  • 박승빈 (한국과학기술원 생명화학공학과)
  • Received : 2014.02.05
  • Accepted : 2014.04.29
  • Published : 2014.08.01
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Abstract

Circulating fluidized bed system consists of SEWGS reactor - lower loop seal - regeneration reactor - riser - cyclone - upper loop seal has been used for solid circulation between the SEWGS reactor and the regeneration reactor in a SEWGS system for pre-combustion $CO_2$ capture. A vertical type lower loop seal has been used in current system but this lower loop seal requires high gas flow rate through the lower loop seal for fluidization and smooth solid circulation, and consequently, causes slugging behavior sometimes. To overcome these disadvantages, inclined type lower loop seal was proposed by this study. Solid circulation characteristics with change of lower loop seal geometry were measured and compared in a bubbling - bubbling - riser type circulating fluidized bed using $CO_2$ absorbent (P-78) as bed material at ambient temperature and pressure. We could conclude that the inclined lower loop seal is better than the vertical type lower loop seal from the viewpoints of minimum flow rate requirement for stable solid circulation and solid height change during solid circulation.

연소전 $CO_2$ 포집용 SEWGS 시스템의 SEWGS 반응기와 재생반응기 사이의 고체순환을 위해 SEWGS 반응기 - 하부루프실 - 재생반응기 - 상승관 - 사이클론 - 상부 루프실로 구성된 순환유동층 시스템을 사용하고 있다. 현재 시스템의 경우 수직형 하부 루프실을 사용하고 있으나 하부 루프실의 유동화 및 안정적인 고체순환을 위해 유량이 많이 필요하고 가끔씩 슬러그가 발생하였다. 본 연구에서는 새로운 하부 루프실 형태로 경사형 하부 루프실을 제안하였으며, 상온, 상압 조건에서 $CO_2$ 흡수제(P-78)를 층물질로 사용하여 기포유동층-기포유동층-고속유동층 형태의 순환유동층 실험장치를 이용하여 하부 루프실의 형태 변화에 따른 고체순환특성을 측정 및 비교하였다. 경사형 하부루프실의 경우가 수직형인 경우보다 적은 유량으로 안정적인 고체순환을 유지할 수 있었으며 두 반응기 사이의 고체층 높이 차이도 발생하지 않는 것으로 나타나 경사형 하부 루프실을 사용하는 것이 유리한 것으로 결론지을 수 있었다.

Keywords

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  1. Solid Circulation Characteristics of Two Lower Loop Seals with Two Kinds of Particles in a Circulating Fluidized Bed System vol.52, pp.1, 2019, https://doi.org/10.1252/jcej.18we057