Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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A Model on a Bubbling Fluidized Bed Process for CO2 Capture from Flue Gas

연소기체로부터 CO2를 포집하는 기포 유동층 공정에 관한 모델

  • Received : 2011.11.21
  • Accepted : 2012.02.07
  • Published : 2012.06.01
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Abstract

This study developed a simple model to investigate effects of important operating parameters on performance of a bubbling-bed adsorber and regenerator system collecting $CO_2$ from flue gas. The chemical reaction rate was used with mean particles residence time of a reactor to determine the extent of conversion in both adsorber and regenerator reactors. Effects of process parameters - temperature, gas velocity, solid circulation rate, moisture content of feed gas - on $CO_2$ capture efficiency were investigated in a laboratory scale process. The $CO_2$ capture efficiency decreased with increasing temperature or gas velocity of the adsorber. However, it increased with increasing the moisture content of the flue gas or the regenerator temperature. The calculated $CO_2$ capture efficiency agreed to the measured value reasonably well. However the present model did not agree well to the effect of the solid circulation rate on $CO_2$ capture efficiency. Better understanding on contact efficiency between gas and particles was needed to interpret the effect properly.

본 연구는 연소기체로부터 $CO_2$ 기체를 포집하는 기포 유동층 흡착 및 재생 반응기 공정의 주요 운전변수의 영향을 조사하기 위해서 단순화된 공정모델을 개발하였다. 반응속도와 반응기에서 고체입자의 평균체류시간을 이용하여 흡착탑과 재생탑에서 각 반응 전환율을 계산하였다. 실험실 규모 기포 유동층 공정에 적용하여 $CO_2$ 포집효율에 대한 온도, 기체유속, 고체순환속도, 연소기체 중 수분농도의 영향을 조사하였다. $CO_2$ 포집효율은 흡착탑의 온도 혹은 유속이 증가함에 따라서 감소하였다. 그러나 연소기체의 수분농도 혹은 재생탑의 온도가 증가함에 따라서 증가하였다. 계산된 $CO_2$ 포집효율은 측정값과 잘 일치하였다. 그러나 본 모델은 $CO_2$ 포집효율에 대한 고체순환속도의 영향과 잘 일치하지 않았다. 이의 해석을 위해서는 기체-고체 접촉효율에 대한 이해가 더 필요하였다.

Keywords

Acknowledgement

Supported by : 한국에너지 기술평가원(KETEP)

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