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막 접촉기-탈거탑 복합 공정을 이용한 이산화탄소 분리회수
Carbon Dioxide Recovery Using Membrane Contactor-Stripper Hybrid Process
한국화학연구원 분리막다기능소재연구센터, 대전 305-600
Membranes and Separation Research Center, Korea Research Institute of Chemical Technology, Daejeon 305-600, Korea
khlee@krict.re.kr
HWAHAK KONGHAK, December 2001, 39(6), 709-714(6), NONE
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Abstract
중공사막 접촉기를 기존의 흡수장치에 흡수기로 도입하여 구축한 hybrid 시스템을 이용하여 이산화탄소의 분리·회수에 관한 연구를 수행하였다. 분리효율이 우수한 중공사막 접촉기를 개발하기 위해 다양한 구조적 특성을 가지는 PVDF, PTFE 및 PP 중공사막을 이용하여 혼합 기체 및 흡수제 유량 등의 운전조건에 따른 이산화탄소 제거효율 특성을 조사하였다. 그 결과 중공사막 접촉기가 기존의 충진 흡수탑에 비해 큰 기-액간의 접촉면적으로 인해 분리효율이 높았으며, 그 중에서도 PVDF중공사 막이 안정된 기-액간의 계면을 유지함으로서 다른 중공사막에 비해 우수한 분리효율을 나타내었다. 또한, 흡수제의 종류(H2O, K2CO3, MEA)에 따른 흡수성능을 조사하고, CO2-MEA계에서 각 중공사막에 대한 물질전달 특성을 비교하였다. 이산화탄소 분리효율, 경제성, 물질전달 특성 등을 고려하면, MEA를 흡수제로 사용한 경우, PVDF 중공사막이 막 접촉기로서 가장 적합할 것으로 기대된다.
Membrane contactor-stripper hybrid process was used to recover CO2 from the flue gas. Porous PTFE, PVDF, PP hollow fiber modules were used as the membrane contactor. The CO2 was removed by the porous polymeric hollow fiber membrane contactor using H2O, K2CO3 or monoethanolamine(MEA) solution as the absorbent. Then, the CO2 was recovered from the absorbent by the thermal stripping tower with steam. The membrane contactor increased the gas-liquid contactor area and mass transfer coefficient, and thus the hybrid process showed a higher CO2 removal efficiency than the conventional absorption tower. PVDF module with smaller pore size showed the most stable gas-liquid interface and the highest removal efficiency among the hollow fiber membrane contactor modules.
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