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수소생산을 위한 디젤 개질용 촉매와 반응특성에 관한 연구
강인용,배중면,Kang, In-Yong,Bae, Joong-Myeon 한국전기화학회 2005 한국전기화학회지 Vol.8 No.1
디젤은 높은 volumetric density$[VD,\;kg\;H_2/m^3]\;(>100)$와 gravimetric density$(GD,\;\%\;H_2)\;(>17)$를 가지는 우수한 수소저장매체 중의 하나이다. (Liquid Hydrogen의 경우 VD와 GD가 각각 50, 18 정도) 본 연구는 이러한 디젤연료의 개질에 적합한 촉매선정 및 반응특성에 관한 연구를 실시하였다 촉매는 자체 선정한 3가지 촉매(NECS-1, NECS-2, NECS-3)와 2가지 상용촉매(FCR-HCl4, FCR-HC35. Sud-Chemie, Inc)에 대하여 조사하였다. 실험결과 NECS-1이 디젤개질에 가장 적합한 것으로 판단되었다. 이와 함께 촉매 층의 길이에 따른 온도 및 농도를 분석하였으며, 디젤개질을 위한 연료의 delivery 문제로 인한 촉매 층 내의 급격한 온도 변화특성을 확인할 수 있었다. 또한 촉매 층 상단부에서 발생한 발열량을 하단부의 흡열부에 효과적으로 전달하는 것이 ATR(Autothermal Reforming) 반응 특성에 깊게 연관되어 있음을 확인할 수 있었다. Diesel is one of the best hydrogen systems, which has very high volumetric density $[kg\;H_2/m^3]\;(>100)\;and\;gravimetric\;density[\%\;H_2]\;(>\;15)$Several catalysts were selected for diesel reforming. 3 catalysts of our group (NECS-1, NECS-2, NECS-3) and 2 commercial catalysts (Sud-Chemie, Inc, FCR-HCl4, FCR-HC35) were used to reform diesel. NECS-1 showed the best performance to reform diesel. In addition to these results, we studied on reaction characteristics for better understanding about auto thermal reforming of diesel by investigating product gas concentrations and temperature Profiles along the catalyst bed. We found technological issues such as fuel delivery and thermal configuration between front exothermic part and rear endothermic part.
개질 반응 특성의 이해를 통한 디젤개질기의 성능개선에 관한 연구
강인용(Inyong Kang),배중면(Joongmyeon Bae),지현진(Hyunjin Jee),송영훈(Younghoon Song) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Reforming reaction can be largely divided into two parts. One is catalytic reaction(CR) and the other is non-catalytic reaction(NCR). A large amount of hydrogen is produced by CR. Therefore solid surface chemistry is used to understand how to reform fuels. On the other hand, NCR usually happen before reaching catalyst bed due to non-uniform mixing of reactants, which causes to make aromatics and olefins which are well known as hard fuels to be reformed. In addition, the reduction of the oxygen content during NCR makes surface kinetics slow down. On the basis of these understanding, we concentrated on how to reduce NCR. So we have tried to atomize diesel using ultrasonic device. Finally we have enhanced reforming efficiency at 20%.
강인용(Inyong Kang),배중면(Joongmyeon Bae) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
This study is about fuel reforming to produce hydrogen for fuel cell. Especially gasoline and diesel are considered as sources of hydrogen. They consist of numerous hydrocarbon fuels. The objective of this research is to show the reforming performance of each fuel. More carbon-contained hydrocarbons were more difficult to be reformed. And aromatic fuels needed more energy for reforming than paraffin fuels. Commercial gasoline and diesel had lower reforming performance than paraffin fuels as surrogate of each fuel. This is due to aromatic components in fuels. Reforming results of Simulated Fuels which consisted of paraffin and aromatic fuels was good agreement with commercial fuels.
탄화수소 연료를 이용한 자열개질 반응기의 전산해석 및 실험
강인용(Inyong Kang),임성광(Sungkwang Leem),윤상호(Sangho Yoon),배중면(Joongmyeon Bae) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Autothermal reforming (ATR) is considered as an effective method to generate hydrogen for fuel cell system due to its high reforming efficiency and compact volume. But ATR requires delicate control strategies comparing with other reforming process such as steam reforming (SR) and partial oxidation (POX). Using numerical approach, we have investigated on various reaction conditions. Inner temperature quickly goes up at front part of catalyst bed, and then goes down by sequential steam-related reactions. O₂/C was a dominant control fact to optimize reforming efficiency. On the other hand, H₂O/C had less effect on reforming chemistry. These results were validated by experiment data.