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임한권 ( Han Kwon Lim ) 한국공업화학회 2014 공업화학 Vol.25 No.2
연구는 1차원 반응기 모델을 이용한 수치 시뮬레이션을 통해 수소투과량, 수소선택도, 사용된 촉매의 양, 급송흐름에서의 H2O/CO 조성비 및 Ar sweep gas가 막반응기(membrane reactor)에서의 수성가스전이반응의 성능에 미치는 영향을 분석하였다. 막반응기에서 평형상태보다 향상된 수소수율을 얻기 위해선 적어도 100 이상의 수소선택도를 가져야 함이 관찰되었으며, 수소투과량이 계속 증가될 경우에는 수소수율의 증가폭이 점차 감소됨이 보였다. 낮은 수소투과량의 경우에는 촉매량이 증가할수록 초기엔 증가된 CO 전환율을 보이다가 점차 그 증가폭이 감소되었으며, 높은 수소투과량의 경우에는 촉매의 양과 무관하게 높은 CO 전환율이 관찰되었다. 급송흐름에서의 H2O/CO 조성비가 1.5 이상인 경우엔 수소투과량이 막반응기에서의 CO 전환율에 미치는 영향이 미미하였고, 막반응기에서 평형상태보다 향상된 CO 전환율을 얻기 위해선 적어도 6.7.10(-6) mol s-1 의 Ar 몰유속이 필요함이 밝혀졌다. This study investigated the effect of hydrogen permeance and selectivity, catalyst amount, H2O/CO ratio in a feed stream, and Ar sweep gas on the performance of a water gas shift reaction in a membrane reactor. It was observed that a minimum hydrogen selectivity of 100 was needed in a membrane reactor to obtain a hydrogen yield higher than the one at equilibrium and the hydrogen yield enhancement gradually decreased as the hydrogen permeance increased. The CO conversion in a mem-brane reactor initially increased with the catalyst amount and reached a plateau later for a membrane reactor with a low hydro-gen permeance while the high CO conversion independent of a catalyst amount was observed for a membrane reactor with a high hydrogen permeance. For the H2O/CO ratio in a feed stream higher than 1.5, a hydrogen permeance had little effect on the CO conversion in a membrane reactor and it was found that a minimum Ar molar flow rate of 6.7.10(-6)mol s-1 was needed to achieve the CO conversion higher than the one at equilibrium in a membrane reactor.
이성근 ( Sung Geun Lee ),임한권 ( Han Kwon Lim ) 대구가톨릭대학교 자연과학연구소 2015 자연과학연구논문집 Vol.13 No.1
The methane steam reforming is widely used to get synthesis gas such as mixture of hydrogen and carbon monoxide. It is carried out in high temperature with catalyst. A numerous study has been worked out both numerically and experimentally for different catalysts and reaction kinetics. In the present study the computer simulation has been studied for the methane steam reforming. While most of the computer based study has assumed isothermal condition throughout the reactor, the investigation here does not need such an assumption. The reactor for the simulation is designed based on the assumption that the size and the material of the reactor have been experimentally practiced in the laboratory. The applied reaction kinetics is that of Aker and Camp. The reformer is heated by four heating tubes inside the reformer. We investigate the temperature profile under the change of the positions of the heating tubes.