Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Intensified Low-Temperature Fischer-Tropsch Synthesis Using Microchannel Reactor Block : A Computational Fluid Dynamics Simulation Study

마이크로채널 반응기를 이용한 강화된 저온 피셔-트롭쉬 합성반응의 전산유체역학적 해석

  • Kshetrimatum, Krishnadash S. (Dept. of Chemical and Biological Engineering, Seoul National University) ;
  • Na, Jonggeol (Dept. of Chemical and Biological Engineering, Seoul National University) ;
  • Park, Seongho (Dept. of Chemical and Biological Engineering, Seoul National University) ;
  • Jung, Ikhwan (Dept. of Chemical and Biological Engineering, Seoul National University) ;
  • Lee, Yongkyu (Dept. of Chemical and Biological Engineering, Seoul National University) ;
  • Han, Chonghun (Dept. of Chemical and Biological Engineering, Seoul National University)
  • ;
  • 나종걸 (서울대학교 화학생물공학부) ;
  • 박성호 (서울대학교 화학생물공학부) ;
  • 정익환 (서울대학교 화학생물공학부) ;
  • 이용규 (서울대학교 화학생물공학부) ;
  • 한종훈 (서울대학교 화학생물공학부)
  • Received : 2017.05.31
  • Accepted : 2017.08.25
  • Published : 2017.08.30
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Abstract

Fischer-Tropsch synthesis reaction converts syngas (mixture of CO and H2) to valuable hydrocarbon products. Simulation of low temperature Fischer -Tropsch Synthesis reaction and heat transfer at intensified process condition using catalyst filled single and multichannel microchannel reactor is considered. Single channel model simulation indicated potential for process intensification (higher GHSV of $30000hr^{-1}$ in presence of theoretical Cobalt based super-active catalyst) while still achieving CO conversion greater than ~65% and $C_{5+}$ selectivity greater than ~74%. Conjugate heat transfer simulation with multichannel reactor block models considering three different combinations of reactor configuration and coolant type predicted ${\Delta}T_{max}$ equal to 23 K for cross-flow configuration with wall boiling coolant, 15 K for co-current flow configuration with subcooled coolant, and 13 K for co-current flow configuration with wall boiling coolant. In the range of temperature maintained (498 - 521 K), chain growth probability calculated is desirable for low-temperature Fisher-Tropsch Synthesis.

피셔-트롭쉬 합성반응은 CO와 H2의 혼합가스로 이루어진 합성가스를 부가가치가 높은 탄화수소 제품으로 변환시킨다. 본 논문에서는 저온 피셔-트롭쉬 합성반응과 단일, 다중 마이크로채널 반응기에 패킹시킨 촉매를 기반으로 강화된 반응조건의 열전달을 고려하여 전산유체역학 기반의 시뮬레이션을 진행하고 분석하였다. 단일채널모델을 통하여 CO 전환률이 ~65% 이상, $C_{5+}$ 선택도가 ~74% 이상을 달성하면서도 Co 기반의 super-active 촉매를 통해 GHSV를 $30000hr^{-1}$을 달성할 수 있음을 보였다. 다중 마이크로채널 반응기모델에서는 열전달 시뮬레이션을 동시에 해석하여, 3가지의 다른 반응기구조에 대해서, 직교류 wall boiling 냉매를 사용시 ${\Delta}T_{max}$가 23 K였으며 평행유동 subcooled 냉매와 평행유동 wall boiling 냉매의 경우 각각 15 K와 13 K의 ${\Delta}T_{max}$를 보였다. 반응기 전체적으로 498 - 521 K에서 온도제어가 가능했으며 계산된 사슬성장 가능성은 저온 피셔-트롭쉬 합성에 적합한 것으로 보인다.

Keywords

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