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개질가스 조성 변화가 고체산화물 연료전지의 장기성능에 미치는 영향
배규종(Gyujong Bae),배중면(Joongmyeon Bae) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This study discusses effects of reformate gas composition on long-term performance of SOFC. In the case of CPOX and ATR reformer driven SOFCs, there were significant deteriorations of terminal voltage due to carbon deposition. The lower order hydrocarbons and CO in reformate are major precursors of carbon formation. The deposited carbon infiltrates into the anode and changes Ni-Ni bonds to Ni-C or C-C bonds. The extent of infiltration of carbon into the Ni-YSZ cermet could be decreased when sufficient steam was supplied into the SOFC anode. To determine the propensity for carbon deposition by CO and lower order hydrocarbons, the ratio of steam to specific carbon in reformate was newly defined (SSCR). When the SSCR values in ATR reformate are maintained at about three, it is possible to have stable operation of the SOFC. This result implies that the SSCR has to be considered an important parameter for stable operation of SOFCs as well as for reforming efficiency or fuel conversion. However, excess value of SSCR results in the decrease of OCV because of dilution of Nernst voltage. Therefore, development of SOFC involving resistance to carbon deposition at low SSCR value is ideal.
배규종(Gyujong Bae),강인용(Inyong Kang),임성광(Sungkwang Lim),배중면(Joongmyeon Bae),김주용(Juyong Kim),이찬호(Chanho Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
This study discusses about research efforts of hydrogen generation from hydrocarbon(e.g., diesel, gasoline, natural gas, and LPG), especially, butane reforming by using Autothermal Reforming Reaction (ATR) technology. Several catalysts were selected for butane ATR. Thermodynamic reactor conditions (temperature, O2/C, S/C) are varied and reforming characteristics of 2 catalysts (Pt and Rh on ceramic supports) and 1 commercial catalyst (FCR-HC35) have been examined. To understand reaction behaviors in an ATR reactor comprehensively, temperature profiles of reactor were observed. By mass transfer limitation, fuel conversion decreases when GHSV was increased. Significant temperature variation along the reactor was observed and it was mainly due reaction kinetics difference between exothermic oxidation and endothermic reforming reaction.
배규종(Bae, Gyu-Jong),박준근(Park, Joon-Geun),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
Currently, many structured catalysts using microchannel are researched to apply to fuel reforming. In this paper, ceramic monolith and metal mesh as structured catalysts are investigated for catalytic autothermal reforming. When GHSV increases, each structured catalyst has better performances(hydrogen production, fuel conversion) than packed bed catalyst for autothermal reforming. The major causes seem to be the elevated heat and mass transfer, gas phase reaction and redistribution of packed bed due to high pressure drop.
배규종(Gyujong Bae),배중면(Joongmyeon Bae),이동율(Dong-ryul Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study discusses about butane autothermal reforming for small scale reactor, especially by using microchannel catalyst. By mass transfer limitation, fuel conversion seriously decreases when GHSV (gas hourly space velocity, /h) increases in a packed bed reactor. In a monolith catalyst reactor, fuel conversion behavior shows dependence on catalyst thickness on the monolith and GHSV. It was mainly attributed to diffusion velocity difference between internal mass transfer and external mass transfer of catalyst particle. Significant performance improvement in metal mesh substrate was obtained compared with a packed bed.
n-Butane 내부개질시 Ni-YSZ와 Cu-Ceria-YSZ에 대한 탄소침적에 관한 연구
배규종(Bae, Gyu-Jong),배중면(Bae, Joong-Myeon),박광진(Park, Kwang-Jin),김용민(Kim, Yong-Min) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
The internal reforming of n-Butane on Ni-YSZ and Cu-Ceria-YSZ was investigated with anode granule at steam to carbon ratio from 0 to 3 and at temperature of 750?C. Although hydrogen production was lager at Ni-YSZ, resistivity for carbon deposition was better at Cu-Ceria-YSZ. These phenomena occur because unwanted side reaction go on with reforming reaction for hydrogen production at Ni-YSZ.
탄화수소 직접 내부개질에 의한 고체산화물 연료전지 운전
배규종(Gyujong Bae),김용민(Yongmin Kim),배중면(Joongmyeon Bae) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The power generation characteristics for n-butane internal reforming type SOFC cell were examined with difference SCR as a function of operation time. Relatively stable operation with slight degradation was possible at SCR=2, otherwise significant performance degradation was observed at SCR=1 and 3 due to carbon deposition and Ni oxidation, respectively. The performance degradation by fuel condition, the electrical conductivity tests with rectangular bar (Ni-YSZ cermet) under different fuels such as CH₄, n-butane and H₂ without and with steam (SCR=2) were measured as a function of exposure time. The conductivity value was significantly decreased with small fluctuation when n-butane was supplied with steam. It is considered that the external reforming should be necessary for fuels containing C₂ or higher hydrocarbons.
배중면(Joongmyeon Bae),배규종(Gyujong Bae) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Pressure drop is an important design parameter for any reactor since it represents an energy loss. The objective of this study is to compare the performance of a packed-bed to a structured catalyst using microchannel. In order to analyze effect on catalyst shape, experiments were carried out with two types catalysts, packed-bed and structured catalyst which has spiral shape. When GHSV increases, the reactor using microchannel catalyst has better performance. The cause of performance difference was analysied. With pressure drop, it represents that microchannel catalyst are suitable for reformer operating high throughput, such as compact reformer.
고체산화물 연료전지용 디젤 자열개질기의 장기성능에 미치는 H<sub>2</sub>O/C와 O<sub>2/C</sub> 몰 비의 영향
윤상호,강인용,배규종,배중면,Yoon, Sang-Ho,Kang, In-Yong,Bae, Gyu-Jong,Bae, Joong-Myeon 한국전기화학회 2007 한국전기화학회지 Vol.10 No.2
고온형 연료전지인 고체산화물 연료전지(solid oxide fuel cell, SOFC)는 연료에 대한 유연성(fuel flexibility)이 높다. 따라서 높은 에너지 밀도를 가진 디젤을 개질하여 SOFC를 운전하는 것은 효과적인 방법이다. 하지만 디젤이 가지는 특성으로 인해 디젤 자열개질기(autothermal refromer)는 운전 시간에 따라 탄소 침적(carbon deposition) 현상이 발생하여 개질기의 성능이 쉽게 저감된다. 개질기 성능 저감 현상 때문에 개질 가스들 중에 탄화수소 생성량이 많아지며, 이는 SOFC 성능도 저감시킨다. 이러한 현상은 연료극에 공급되는 탄화수소가 야기하는 탄소 침적으로 사료된다. 본 연구에서는 탄화수소가 SOFC에 주는 성능 저감을 확인하였으며, 연료전지 성능 저감을 줄이기 위한 디젤 자열개질기 반응물들의 조건 선정($H_2O/C$와 $O_2/C$의 몰 비)을 통해 디젤 자열 개질기 특성을 살펴보았다. 특히 $H_2O/C=0.8$과 $O_2/C=3$인 디젤 자열개질 반응 조건에서 좋은 개질 성능을 확인할 수 있었다. Solid oxide fuel cell(SOFC) has high fuel flexibility due to its high operating temperatures. Hydrocarbonaceous fuels such as diesel has several advantages such as high energy density and established infrastructure for fuel cell applications. However diesel reforming has technical problems like coke formation in a reactor, which results in catastrophic failure of whole system. Performance degradation of diesel autothermal reforming (ATR) leads to increase of undesirable hydrocarbons at reformed gases and subsequently degrades SOFC performance. In this study, we investigate the degradation of SOFC performance(OCV, open circuit voltage) under hydrocarbon(n-Butane) feeds and characteristics of diesel performing under various ratios of reactants($H_2O/C,\;O_2/C$ molar ratios) for improvement of SOFC performance. Especially we achieved relatively high performance of diesel ATR under $H_2O/C=0.8,\;O_2/C=3$ condition.
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.
윤상호(Sangho Yoon),배규종(Gyujong Bae),배중면(Joongmyeon Bae) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Solid oxide fuel cell(SOFC) has a higher fuel flexibility than low temperature fuel cells, such as PEMFC and PAFC, due to its high operation temperatures. Diesel can be a good candidate for SOFC system fuel because diesel has high hydrogen density and well-established infrastructure, despite several problems such as sulfur poisoning of catalyst and carbon deposition. In this paper, we use microchannel catalyst for diesel autothermal reforming (ATR) and will compare characteristics of reforming performances between packed-bed and microchannel catalyst(monolith-type, mesh-type). We also investigate mesh-typed microchannel catalyst for ㎾e SOFC system.