• Title, Summary, Keyword: Fuel reforming

Search Result 293, Processing Time 0.04 seconds

PEMFC Operation Connected with Methanol Reformer System

  • Lee, Jung-Hyun;Park, Sang-Sun;Shul, Yong-Gun;Park, Jong-Man;Kim, Dong-Hyun;Kim, Ha-Suck;Yoo, Seung-Eul
    • Carbon letters
    • /
    • v.9 no.4
    • /
    • pp.303-307
    • /
    • 2008
  • The studies on integrated operation of fuel cell with fuel processor are very essential prior to its commercialization. In this study, Polymer Electrolyte Membrane Fuel Cell (PEMFC) was operated with a fuel processor, which is mainly composed of two parts, methanol steam reforming reaction and preferential oxidation (PROX). In fuel processor, ICI 33-5 (CuO 50%, ZnO 33%, $Al_2O_3$ 8%, BET surface area: $66\;m^2g^{-1}$) catalyst and CuO-$CeO_2$ catalyst were used for methanol steam reforming, preferential oxidation (PROX) respectively. PEMFC was operated by hydrogen fuel generated from fuel processor. The resulting gas from PROX reactor is used to operate PEMFC equipped with our prepared anode and cathode catalyst. PtRu/C catalyst gives more tolerance to CO.

Analysis of Performance Characteristics of Gas Turbine-Pressurized SOFC Hybrid Systems Considering Limiting Design Factors (제한요소를 고려한 가스터빈-가압형 SOFC 하이브리드 시스템의 성능특성 해석)

  • Yang Won Jun;Kim Tong Seop;Kim Jae Hwan
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.16 no.11
    • /
    • pp.1013-1020
    • /
    • 2004
  • The hybrid system of gas turbine and fuel cell is expected to produce electricity more efficiently than conventional methods, especially in small power applications such as distributed generation. The solid oxide fuel cell (SOFC) is currently the most promising fuel cell for the hybrid system. To realize the conceptual advantages resulting from the hybridization of gas turbine and fuel cell, optimized construction of the whole system must be the most important. In this study, parametric design analyses for pressurized GT/SOFC systems have been peformed considering probable practical limiting design factors such as turbine inlet temperature, fuel cell operating temperature, temperature rise in the fuel cell and soon. Analyzed systems include various configurations depending on fuel reforming type and fuel supply method.

Temperature Characteristics of the Molten Carbonate Fuel Cell Stack (용융탄산염형 연료전지의 스택구조와 온도특성)

  • Lee, Choong-Gon;Ahn, Kyo-Sang;Park, Seong-Yeon;Seo, Hai-Kyung;Lim, Hee-Chun
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.15 no.1
    • /
    • pp.54-61
    • /
    • 2004
  • Temperature characteristics in a stack of molten carbonate fuel cell (MCFC) have been investigated with simulation based on the computational fluid dynamics (CFD) codes and experimental way. The MCFC has generally two stack structures when the natural gas is used as fuel; one is the external reforming type and the other is internal reforming type. Computer simulation at the external reforming stack suggests that the maximum temperature in the stack depends on the gas flow length. The 2 kW MCFC stack with 25 cm gas flow length showed about $675^\circ{C}$ of maximum temperature.

Effect of System Configuration on Design Performance of Atmospheric Pressure MCFC/Gas Turbine Hybrid Systems (상압형 MCFC/가스터빈 하이브리드 시스템의 구성방법에 따른 설계성능 분석)

  • Oh Kyong Sok;Kim Tong Seop
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.16 no.11
    • /
    • pp.1021-1027
    • /
    • 2004
  • Design performances of various configurations of hybrid systems combining an atmospheric pressure molten carbonate fuel cell and a gas turbine have been analyzed. Two different fuel reforming methods (internal and external reforming) were considered. Influences of turbine inflow heating method, location of fuel combustor and associated component arrangements were investigated. In general, internal reforming leads to higher system efficiencies. The optimum design pressure ratio varies among different system configurations. In particular, the design point selection is closely related to the allowable turbine inlet temperature. Configurations with direct heating of turbine inlet flow may realize both higher efficiency and higher specific power than those with indirect heating.

Performance Characteristics Analysis of Gas Turbine-Pressurized SOFC Hybrid Systems (가스터빈-가압형 SOFC 하이브리드 시스템의 성능특성 해석)

  • 양원준;김동섭;김재환
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.16 no.7
    • /
    • pp.615-622
    • /
    • 2004
  • Recently, the hybrid system combining fuel cell and gas turbine has drawn much attention owing to its high efficiency and ultra low emission. It is now on the verge of world wide development and various system configurations have been proposed. A national project funded by Korean government has also been initiated to develop a pressurized hybrid system. This work aims at presenting design performance analysis for various possible system configurations as an initial step for the system development. Study focuses are given to major design options including the power ratio between gas turbine and fuel cell, reforming method (internal or external), reforming heat source (reforming burner, cathode hot air, fuel cell heat release) and steam supply method for reformer (anode gas recirculation, external steam generator). A wide variation in performance among different configurations has been predicted.

Parametric Study of an Integrated Steam Methane Reformer with Top-Fired Combustor (통합 수증기 개질 시스템의 작동 조건에 대한 수치적 연구)

  • Noh, Jung-Hun;Jung, Hye-Mi;Kim, Donghee;Um, Sukkee
    • 한국신재생에너지학회:학술대회논문집
    • /
    • /
    • pp.156.1-156.1
    • /
    • 2011
  • It is of great importance to predict operating parameter characteristics of an integrated fuel processor by the increased life-time and system performance. In this study, computational analysis is performed to gain fundamental insights on transport phenomena and chemical reactions in reformer which consists of preheating, steam reforming, and water gas shift reaction beds. Also, a top-fired burner locates inside of the reforming system. The combustor is providing thermal energy necessary for the steam reforming bed which is a endothermic catalytic reactor. Two-dimensional numerical model of the integrated fuel processing system is introduced for the analysis of heat and mass transport phenomena as well as surface kinetics and catalytic process. A kinetic model was developed and then computational results were compared with the experimental data available in the literature. Subsequently, parameter study using the validated steam methane reforming model was conducted by considering operating parameters, i.e. steam to carbon ratio and temperature.

  • PDF

NUMERICAL STUDY OF STREAM REFORMER AND PRECONVERTER FOR MCFC (MCFC용 개질기 및 프리컨버터의 수치연구)

  • Byun, Do-Hyun;Sohn, Chang-Hyun
    • Journal of computational fluids engineering
    • /
    • v.16 no.1
    • /
    • pp.42-47
    • /
    • 2011
  • In this paper, various operating parameters of stream reforming process from methane in stream reformer and preconverter for MCFC is studied by numerical method. Commercial code is used to simulated the porous catalyst with user subroutine to model three dominant chemical reactions which are Stream Reforming(SR), Water-Gas Shift(WGS), and Direct Stram Reforming(DSR). The hydrogen production is tested with different wall temperature and different reactor shapes. The calculated results of the concentration of hydrogen in stream reformer are very well consistent with experimental results. This numerical study gives the design reactor wall temperature condition and size of reactor to satisfy the required fuel conversion.

The Operation of Polymer Electrolyte Membrane Fuel Cell using Hydrogen Produced from the Combined Methanol Reforming Process

  • Park, Sang Sun;Jeon, Yukwon;Park, Jong-Man;Kim, Hyeseon;Choi, Sung Won;Kim, Hasuck;Shul, Yong-Gun
    • Journal of Electrochemical Science and Technology
    • /
    • v.7 no.2
    • /
    • pp.146-152
    • /
    • 2016
  • A combined system with PEMFC and reformer is introduced and optimized for the real use of this kind of system in the future. The hydrogen source to operate the PEMFC system is methanol, which needs two parts of methanol reforming reaction and preferential oxidation (PROX) for the hydrogen fuel process in the combined operation PEMFC system. With the optimized methanol steam reforming condition, we tested PROX reactions in various operation temperature from 170 to 270 ℃ to investigate CO concentration data in the reformed gases. Using these different CO concentration, PEMFC performances are achieved at the combined system. Pt/C and Ru promoted Pt/C were catalysts were used for the anode to compare the stability in CO contained gases. The alloy catalyst of PtRu/C shows higher performance and better resistance to CO than the Pt/C at even high CO amount of 200 ppm, indicating a promotion not only to the activity but also to the CO tolerance. Furthermore, in a system point of view, there is a fluctuation in the PEMFC operation due to the unstable fuel supply. Therefore, we also modified the methanol reforming by a scaled up reactor and pressurization to produce steady operation of PEMFC. The optimized system with the methanol reformer and PEMFC shows a stable performance for a long time, which is providing a valuable data for the PEMFC commercialization.

Effect of Coal Ash as A Catalyst in Biomass Tar Steam Reforming (바이오매스 타르 수증기 개질에서의 석탄회재 촉매 효과)

  • JANG, JINYOUNG;OH, GUNUNG;RA, HOWON;SEO, MYUNGWON;MUN, TAEYOUNG;MOON, JIHONG;LEE, JAEGOO;YOON, SANGJUN
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.28 no.4
    • /
    • pp.323-330
    • /
    • 2017
  • Ash remaining after coal combustion was used as a catalyst support for tar steam reforming with various proportions of $Al_2O_3$ added for higher reforming efficiency. At a constant Ni content of 12 wt%, a coal ash and $Al_2O_3$ were mixed at a ratio of 5:5, 7:3, 9:1. As a result, the catalytic activity for toluene steam reforming was improved by adding $Al_2O_3$ at $500-600^{\circ}C$. The catalysts with ratio 7:3 and 5:5 reached toluene conversion of 100% above $700^{\circ}C$. When comparing the catalysts in which the coal ash and $Al_2O_3$ mixed at a ratio of 5:5 and 7:3 with the Ni/Al catalyst, it was concluded that this coal ash catalyst has efficient catalytic performance.

The Effect of DBD Plasma on Fuel Reforming and on the Characteristics of Laminar Flames (DBD 플라즈마에 의한 연료개질 및 층류 화염 특성 변화)

  • Kim, Eungang;Park, Sunho;Song, Young-Hoon;Lee, Wonnam
    • 한국연소학회:학술대회논문집
    • /
    • /
    • pp.195-198
    • /
    • 2014
  • $Fuel/N_2$ and fuel/air mixtures were treated with non-thermal DBD plasma and the changes in characteristics of laminar diffusion flame have been observed. Flame of $Fuel/N_2$ mixture generated more soot under plasma condition while less amount of soot was formed from fuel/air mixture flame. Luminescence spectrum and gas chromatography results confirmed that plasma energy converts a fraction of fuel molecules into radicals, which then form $C_2$, $C_3$, $C_4$ and higher hydrocarbon under no oxygen condition or turn into CO, $CO_2$ and $H_2O$ when oxygen is present.

  • PDF