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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.
디젤개질기의 작동조건이 고체산화물 연료전지의 성능에 미치는 영향
강인용(Inyong Kang),배중면(Joongmyeon Bae),지현진(Hyunjin Jee),배규종(Gyoujong Bae),유영성(Youngsung Yoo) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Diesel reforming was investigated as a method to supply fuel for SOFC(Solid Oxide Fuel Cell). Objective of this paper is to draw actual problems which happen when a diesel reformer combines with a SOFC stack. ATR(Autothermal Reforming) was used to reform diesel. S/C(Steam to Carbon ratio), O/C(Oxygen to Carbon ratio), GHSV(Gas Hourly Space Velocity) and temperature of reactor were manipulated to control operating conditions of diesel reformer. Those conditions directly affected the performance of a SOFC stack. Other detailed conditions of the reactor also caused power change of SOFC.
수소 생산을 위한 탄화수소 연료의 개질 특성에 관한 연구
강인용(Inyong Kang),배규종(Gyujong Bae),배중면(Joongmyeon Bae) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Fuel cell requires hydrogen fuel for high electrochemical performance. Generally hydrogen is produced by reforming process using fossil fuel. In this study, various hydrocarbons were reformed. And commercial fuels such as gasoline, diesel and GTL were also investigated. Paraffin-hydrocarbon fuels were easy to be reformed. Maximum reforming efficiency using C₁?H₃₄ is 83%. But when 30-vol% aromatic-hydrocarbon fuels are added, reforming efficiency falls down to 67%. Commercial diesel has low efficiency due to aromatics included. Most of all, solid carbons on catalyst were observed in diesel reforming by SEM/EDX analysis. Finally paraffins which have long-carbon channel are good candidate fuel in hydrocarbon reforming due to not only high hydrogen density but also low possibility of coke formation. Therefore GTL which has low aromatic components and low sulfur is good commercial fuel to produce hydrogen. This has similar performance to C₁?H₃₄.
강인용(Inyong Kang),윤상호(Sangho Yoon),배중면(Joongmyeon Bae) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An on-board diesel reformer for producing hydrogen-rich gases can be applied for not only a fuel cell system, but also an internal combustion engine for low emission vehicles. Diesel is reformed by autothermal reforming (ATR) reaction due to its high reforming efficiency comparing with steam reforming (SR) and catalytic partial oxidation (CPOX). ATR is a slightly exothermic reaction. If we control the reaction exothermicity, it is possible to design a self-sustaining diesel reformer. In previous researches, we have already studies about the factors to affect the exothermicity of the ATR reaction such as O₂/C (oxygen to carbon ratio), S/C (steam to carbon ratio), GHSV (gas hourly space velocity). In this paper, we will introduce an actual self-sustained 100We-c1ass diesel reformer. Especially, startup protocol of the diesel reformer and product distributions in steady-state operation will be presented. The diesel reformer was continuously operated for about 1 day with stable manner. But eventually, severe carbon deposition was happened after the period.