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Received December 6, 2004
Accepted March 7, 2005
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활성탄소섬유상에서 전기변동법을 이용한 CO2의 흡/탈착
Adsorption/desorption of CO2 on Activated Carbon Fibers Using Electric Swing Adsorption
한국에너지기술연구원, 305-343 대전시 유성구 장동 71-2
Korea Institute of Energy Research, 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
shmoon@kier.re.kr
Korean Chemical Engineering Research, June 2005, 43(3), 432-437(6), NONE Epub 7 July 2005
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Abstract
혼합가스로부터 CO2를 분리, 회수하기 위하여 활성탄소섬유를 흡착제로 사용한 전기변동흡착(electric swing adsorption, ESA) 공정의 타당성을 검토하였다. 활성탄소 섬유는 상압에서도 CO2에 대해 빠른 흡착 속도를 보였으며, 비교적 짧은 흡착대와 긴 파과시간, 흡착제의 단위무게당 높은 흡착량을 나타내었다. 포화흡착된 흡착탑의 재생에서 비표면적이 큰 활성탄소섬유일수록 일정한 모양의 파과곡선을 유지하여 흡착-탈착의 재생사이클에 유리하였다. 진공탈착에 의한 흡착탑의 재생률은 64 cmHg의 압력에서도 64％ 이상이었고, 전기탈착을 병행한 hybrid 재생단계에서는 17％의 추가적인 재생률을 보이며 7-8Wh의 낮은 재생에너지에서도 높은 재생률을 보였다.
An electric swing adsorption (ESA) process for recovering highly pure CO2 from the mixed gases was tested. In this study, activated carbon fibers were used as an adsorbent. The activated carbon fibers showed fast adsorption rate and the high adsorption capacity for CO2 adsorption under the condition of the ambient pressure. Activated carbon fiber with higher specific surface area was suitable to repeated adsorption-desorption cycle process, showing consistent breakthrough curve. Especially, the regeneration method by vacuum combined with ESA improved the performance of desorption process by an additional 17％ regeneration efficiency compared to a vacuum only method, and showed the high regeneration efficiency at comparatively low 7-8Wh energy.
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