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CO2 회수를 위한 PSA공정에서 탈착 및 세정조건이 공정 성능에 미치는 영향

Effect of Evacuation and Rinse Conditions on Performance in PSA Process for CO2 Recovery

이화웅 최재호¹ 여영구¹ 송형근 나병기^†

Hawung Lee Jae-ho Choi¹ Yeong-Koo Yeo¹ Hyung Keun Song Byung-Ki Na^†

한국과학기술연구원 청정기술연구센터, 서울 136-791 ¹한양대학교 화학공학과, 서울 133-791

Clean Technology Research Center, KIST, Seoul 136-791, Korea ¹Dept. of Chem. Eng., Hanyang University, Seoul 133-791, Korea

nabk@kist.re.kr

HWAHAK KONGHAK, December 2000, 38(6), 809-816(8), NONE

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Abstract

강흡착질이 생성물인 PSA 공정에서, 탈착 및 세정단계가 공정의 성능에 미치는 영향을 모사를 통하여 고찰하였다. 세정과 탈착단계는 강흡착질을 고순도의 생성물로 얻기 위한 중요한 단계이다. 따라서 세정단계의 조건을 변화시켜 공정의 효율을 높이는 방향으로서 세정압력, 세정환류비 그리고 세정방향을 변수로 선정하여 이들 변수에 따른 성능의 변화를 분석하였다. 또한 탈착압력의 변화를 세정의 조건변화와 결부시켜 고찰하는 과정을 통하여 최적의 성능을 얻는 조업조건을 찾을 수 있었다. 세정압력의 증가는 세정시의 흡착되는 CO2의 양을 증가시켜 순도보다 회수율의 증가에 큰 효과를 보였으며, 탈착압력의 감소는 탈착량을 증가시켜 높은 순도의 증가효과를 가져오는 것으로 나타났다. 이 과정에서 압력조건에 따른 최적의 세정환류비가 존재함을 확인할 수 있었다.

The effect of evacuation and rinse step on the process performance was studied using numerical simulation to recover heavy component in a PSA process. Rinse and evacuation steps are very important to obtain heavy component as a product. Therefore, to improve the process performance, the rinse pressure, reflux ratio and flow direction of rinse step were selected as variables, and the performance change of process according to changing variables was investigated. The effect of evacuation condition combined with the rinse condition was studied also. As a result, the optimum operating condition was obtained to have maximum process performance. Increasing rinse pressure conduced to increase the recovery by increasing adsorbed amount of CO2 during the rinse step. Decreasing evacuation pressure contributed to increase the purity by increasing adsorbed amount of CO2 during the evacuation step. At this point, the optimum reflux ratio was existed at certain pressure conditions.

Keywords

CO2 PSA Rinse Evacuation Simulation

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