• Title/Summary/Keyword: Polymer electrolyte membrane

Search Result 632, Processing Time 0.029 seconds

Numerical Study on a Poly-Generation Based on Gasification for Retrofit of a Natural Gas Combined Cycle (복합계통 개조를 위한 가스화 폴리제너레이션 시뮬레이션 연구)

  • Seo, Dong-Kyun;Joo, Yong-Jin;Hong, Jin-Phyo;Kim, Kyung-Rae;Lee, Jeong-Bak
    • KEPCO Journal on Electric Power and Energy
    • /
    • v.3 no.2
    • /
    • pp.141-146
    • /
    • 2017
  • In this work, a simulation study on net 500 MW class of Poly-Generation was conducted for the retrofit of an aged natural gas combined cycle. An entrained gasifier which has a capacity of maximum $260,000Nm^3/h$, 50 MW class of a Polymer Electrolyte Membrane Fuel Cell, and H-class Gas Turbine were selected as key processes. After unit design for those employed processes was set up and combined, the simulation was carried out with Gate-Cycle software (Ver. 6.0) for two cases. The selected cases are a retrofit type (Poly-Gen 1) and a new type (Poly-Gen 2). It was found that the efficiency of the retrofit case is 2.7% lower than that of the new case.

Synthesis and Durability of Carbon-Supported Catalysts for PEMFC (내구성 향상을 위한 연료전지 촉매 개발)

  • YI, MI HYE;CHOI, JIN SUNG;RHO, BUMWOOK
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.26 no.4
    • /
    • pp.318-323
    • /
    • 2015
  • For commercialization of fuel cell electric vehicles, one of the key objectives is to improve durability of MEA and electrocatalysts. Regarding electrocatalysts, the major issue is to reduce carbon corrosion and dissolution of Pt caused by harsh conditions, for example, SU/SD (Start-up/Shut-down). In this research, OER (Oxygen Evolution Reaction) catalyst has been developed improvement of durability. A modified polyol process is developed by controlling the pH of the solvent to synthesize the PtIr nanocatalysts on carbon supports. Each performance of the MEAs applying PtIr and Pt are equivalent because PtIrnanocatalysts have both ORR and OER activity. Breadboard test for catalyst durability in harsh conditions and high potentialsis found that the MEA applying PtIrnanocatalysts durability is improved more than the MEA applying Pt nanocatalysts.

Study on the Electric Insulation Characteristics in a Fuel Cell Vehicle (연료전지 차량의 전기적 절연 특성에 관한 연구)

  • Yu, Jung-Han;kim, Duck-Whan;Kim, Ju-Han;Jeong, Kwi-Seong;Kum, Young-Bum;Kim, Sae-Hoon;Ahn, Deuk-Kuen
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.23 no.2
    • /
    • pp.150-155
    • /
    • 2012
  • Polymer Electrolyte Membrane Fuel Cell (PEMFC) stack power output is needed to be approximately 100 kW to meet the requirements of automotive applications. In order to secure the electric safety for drivers, passengers and mechanics, it is very important to understand phenomena of an electric insulation in a fuel cell vehicle. In this study, we studied the electric insulation properties and the insulation resistance of stack, system and vehicle in the field of fuel cell was estimated at the applied voltage of 500 V, respectively. Also we discussed the insulation factors such as the conductivity of coolant, the element of vehicle design and the intrinsic resistance of the vehicle components.

Effect of Carbon Fiber Filament and Graphite Fiber on the Mechanical Properties and Electrical Conductivity of Elastic Carbon Composite Bipolar Plate for PEMFC (PEMFC용 탄성 탄소 복합재료 분리판의 기계적 강도 및 전기전도도에 미치는 탄소섬유 필라멘트와 흑연 섬유의 영향)

  • Lee, Jaeyoung;Lee, Wookum;Rim, Hyungryul;Joung, Gyubum;Lee, Hongki
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.25 no.2
    • /
    • pp.131-138
    • /
    • 2014
  • Highly conductive bipolar plate for polymer electrolyte membrane fuel cell (PEMFC) was prepared using phenol novolac-type epoxy/graphite powder (GP)/carbon fiber filament (CFF) composite, and a rubber-modified epoxy resin was introduced in order to give elasticity to the bipolar plate graphite fiber (GF) was incorporated in order to improve electrical conductivity. To find out the cure condition of the mixture of novolac-type and rubber-modified epoxies, differential scanning calorimetry (DSC) was carried out and their data were introduced to Kissinger equation. And tensile and flexural tests were carried out using universal testing machine (UTM) and the surface morphology of the fractured specimen and the interfacial bonding between epoxy matrix and CFF or GF were observed by a scanning electron microscopy (SEM).

Optimal Sizing of the Manifolds in a PEM Fuel Cell Stack using Three-Dimensional CFD Simulations (3차원 CFD 시뮬레이션을 활용한 고분자전해질 연료전지 스택의 매니폴드 크기 최적화)

  • Jeong, Jeehoon;Han, In-Su;Shin, Hyun Khil
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.24 no.5
    • /
    • pp.386-392
    • /
    • 2013
  • Polymer electrolyte membrane (PEM) fuel cell stacks are constructed by stacking several to hundreds of unit cells depending on their power outputs required. Fuel and oxidant are distributed to each cell of a stack through so-called manifolds during its operation. In designing a stack, if the manifold sizes are too small, the fuel and oxidant would be maldistributed among the cells. On the contrary, the volume of the stack would be too large if the manifolds are oversized. In this study, we present a three-dimensional computational fluid dynamics (CFD) model with a geometrically simplified flow-field to optimize the size of the manifolds of a stack. The flow-field of the stack was simplified as a straight channel filled with porous media to reduce the number of computational meshes required for CFD simulations. Using the CFD model, we determined the size of the oxidant manifold of a 30 kW-class PEM fuel cell stack that comprises 99 cells. The stack with the optimal manifold size showed a quite uniform distribution of the cell voltages across the entire cells.

Hybrid & Fuel Cell Connection Power System for Ocean Structure (하이브리드 및 연료전지 연계형 해양구조물용 전력체계)

  • Park, Do-Young;Oh, Jin-Seok
    • Journal of Navigation and Port Research
    • /
    • v.35 no.8
    • /
    • pp.637-641
    • /
    • 2011
  • Ocean structure's power system is difficult to construct a stand-alone power system. Therefore, to manage effectively power system of ocean structure, it's important to construct power system which is connected fuel-cell with hybrid power system. This paper designs power system of fuel-cell for the sea based on hydrogen generation mechanism, calculation of using electric power, etc. Designed power system is analysed & simulated using LabVIEW program. And, this paper suggests design method of power system for ocean structure based on analysed & simulated results.

Development of the Low Cost Assembled Separator (저가형 조립 분리판의 개발)

  • Hwang, Yong-Sheen;Lee, Ju-Hyung;Ji, Sang-Hun;Park, Jun-Ho;Lee, Dae-Young;Cha, Suk-Won
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2009.11a
    • /
    • pp.247-250
    • /
    • 2009
  • This study considers the feasibility of using the low cost assembled separator. The graphite plate has been widely used as the separator in the field of PEMFCs(Polymer electrolyte membrane fuel cell) industry because of its excellent material properties such as good corrosion resistance, good electrical conductance and so on. However, there are some problems for the commercialization due to its poor cost effectiveness for the large volume manufacturing and lack of mechanical strength. From this respect, this study has focused on the manufacturing technology in order to reduce the price for the commercialization of separator. This study also shows that the assembled separator of the suggested structure, which is composed of grafoil and PC(PolyCarbonate) materials, could be manufactured at low cost enough for the mass production. The flow fields produced by cutting foils and the base plates of the separators were simply made by mechanical work.

  • PDF

Electrocatalytic activity of carbon-supported near-surface alloys (NSAs) for electrode reaction of fuel cell (연료전지 전극 반응을 위한 카본 담지 표면 합금의 전기촉매 활성)

  • Park, In-Su;Sung, Yung-Eun
    • New & Renewable Energy
    • /
    • v.2 no.4 s.8
    • /
    • pp.64-69
    • /
    • 2006
  • There is a worldwide interest in the development and commercialization of polymer electrolyte membrane fuel cells [PEMFCs] for vehicular and stationary applications. One of the major objectives is the reduction of loaded electrode materials, which is comprise of the Pt-based noble metals. In this paper, a novel chemical strategy is described for the preparation and characterization of carbon-supported and surface-alloys, which were prepared by using a successive reduction process. After preparing Au colloid nanoparticles, the supporting of Au colloid nanoparticles occurred spontaneously in the carbon black-dispersed aqueous solution. Then nano-scaled active materials were formed on the surface of carbon-supported Au nanoparticles. The structural and electrochemical analyses indicate that the active materials were deposited on the surface of Au nanoparticles selectively and that an alloying process occurred during the successive reducing process. The carbon-supported & surface-alloys showed the higher electrocatalytic activity than those of the particle-alloys and commercial one [Johnson-Matthey] for the reaction of methanol and formic acid oxidation. The increased electrocatalytic activity might be attributed to the effective surface structure of surface-alloys, which have a high utilization of active materials for the surface reaction of electrode.

  • PDF

The Effects of the Inclination on the Performance of dead-end operating PEM Fuel Cell (고분자 연료전지의 데드엔드 운전 시 기울임에 따른 성능 변화)

  • Jeong, Jee Hoon;Kho, Back Kyun;Han, In-Su;Shin, Hyun Khil;Hur, Tae Uk;Cho, Sung Baek
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2011.11a
    • /
    • pp.89.2-89.2
    • /
    • 2011
  • In automotive applicatons or water vehicles, the polymer electrolyte membrane fuel cell(PEMFC) stack is keep moving while their operation. Especially the inclination environment can take a effect to fuel cell stack perfromance, because this condition can cause a bad effect to water exhaust of fuel cell stack. In this study, a large scale stack(over 100kW power) is inclined upto 30 degree in lengthwise and crosswise using stack lift equipment. And the stack is operated in 10~100% load. No significant change has appeared in crosswise inclined condition and lenthwise low angle. But in lenthwise large angle tilting condition, the fuel cell performance has significantly decreased. And this performance decrease is aggravated in low load. An active water exhaust device is applied to the stack to prevent the performance decrease. And in lenthwise large angle tilting condition, this device cause a good effect to fuel cell stack performance.

  • PDF

Research on Improving in Mass Transfer Characteristics by Cathode Wave-Form Channel (Wave 형상 채널을 통한 연료전지 Cathode에서의 물질전달 특성 향상에 관한 연구)

  • Lee, Kyu-Ho;Nam, Ki-Hoon;Byun, Jae-Ki;Choi, Nam-Hyun;Choi, Young-Don
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.22 no.1
    • /
    • pp.69-76
    • /
    • 2011
  • PEMFC (polymer electrolyte membrane fuel cell) is device that generates electricity from hydrogen. It is one of the subjects related to renewable energy and various research has been conducted on the PEMFC. PEMFC has low operating temperature and high efficiency among fuel cells, and is given attention as means for automobile and domestic use. Analysis of flow field pattern in supplying hydrogen and oxygen is part of the research to increase PEMFC efficiency. In this study, separation plate currently used in PEMFC is transformed to wave shape and mass transfer characteristics in the channel is examined through numerical and experimental analysis. Wave shape separation plate yielded 18% increase of efficiency compared to separation plate used in normal channel. And improvements in mass transfer characteristics were verified.