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흡착제 향류흐름효과를 주는 다탑압력스윙흡착 공정의성능해석

Performance Analysis of a Multi-Bed PSA Process to Simulate a Countercurrent Flow of Adsorbent

신흥수 서성섭

Shin HS Suh SS

HWAHAK KONGHAK, December 1998, 36(6), 930-936(7), NONE

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Abstract

이성분계 가스분리를 위한 압력스윙흡착(PSA) 공정에 흡착제 향류흐름효과를 주는 다탑씨스템을 도입하여 이론적으로 성능분석하였다. 수치모사시 발생하는 어려움을 줄이기 위해 다탑싸이클을 1탑싸이클로 단순화하였고 선형흡착등온식, 등온조작의 가정 하에 기상과 흡착제상에서 물질수지를 세워 모델링하였다. 흡착제내로의 물질전달은 Linear Driving Force 모델로 표시된다고 보았다. 탄소분자체를 이용하여 공기로부터 질소를 생산하는 계에 대하여 탑수증가에 따른 공정성능변화를 생성률, 회수율 관점에서 조사하였다. 퍼지단계동안 흡착탑 완전 및 불완전재생이 성능에 미치는 영향을 조사하였고 산소에 대한 탑이용률과 성능과의 관계를 분석하였다. 탑수에 따른 공정성능은 운전조건에 따라 증가 또는 감소하였고 탑이용률은 성능과 밀접한 관계를 보여주었다.

Process performance of a multi-bed pressure swing adsorption(PSA) process to simulate a countercurrent flow of adsorbent for separation of a binary gas mixture was analyzed theoretically. A multi-bed PSA cycle was simplified to an one-bed cycle in order to reduce difficulties in simulation. Material balances were formulated in gas and adsorbent phases under the assumption of linear isotherms for components and isothermal operation. The mass transfer within an adsorbent was described by linear driving force model. The system considered in this study was nitrogen production from air by carbon molecular sieve. Process performance was examined in view of productivity and recovery, and was related to the fraction of bed utilization for oxygen. The effect of complete and incomplete regeneration during a purge step on performance was investigated respectively. Process performance increases or decreases as the number of bed increases depending on the operating conditions and has a close relation with a fraction of bed utilization for oxygen.

Keywords

Multi-Bed PSA Simulation Simulated Countercurrent Flow Bed Utilization

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