• Title/Summary/Keyword: phosphoric acid fuel cell(PAFC)

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Heat and Mass Transfer Analysis of Phosphoric Acid Fuel Cell According to Variation of gas Flow passage (인산형 연료전지의 가스유로방향 변화에 따른 열 및 물질전달해석)

  • 전동협;정영식;채재우
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.5
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    • pp.1338-1346
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    • 1994
  • The objective of this study is to investigate the effect of various parameters, such as temperature, mean current density and voltage on the performance of phosphoric acid fuel cell (PAFC) by numerical analysis. Two types of flow passages, which are Z-parallel type and Z-counter type, are evaluated to obtain the best current density and temperature distribution. Parametric studies and sensitivity analysis of the PAFC system's operation in single cell are accomplished. A steady state simulation of the entire system is developed using nonlinear ordinary differential equations. The finite difference method and trial and error procedures are used to obtain a solution.

Characteristics of Matrix Retaining Electrolyte in a Phosphoric Acid Fuel Cell Analyzed by A.C. Impedance Spectroscopy (복소임피던스법에 의한 인산형 연료전지용 전해질 매트릭스 특성)

  • 윤기현;장재혁;허재호;김창수;김태희
    • Journal of the Korean Ceramic Society
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    • v.32 no.2
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    • pp.189-196
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    • 1995
  • Materials retaining electrolyte of a phosphoric acid fuel cell (PAFC) have been prepared with SiC powder to SiC whisker mixing ratios of 1:1, 1:2, 1:3, 1:4, 0:1 by a tape casting method. When 3wt% dispersant (sorbitan monooleate) is added to a matrix, the porosity of the matrix decreases a little while the bubble pressure and area of the matrix increase remarkably in comparison with no dispersant content. Effect of the electrolyte resistance and the polarization resistance on perfomance of a PAFC has been investigated using A.C. impedance spectroscopy. With the increase of whisker content, the electrolyte resistance decreases due to the increase of porosity and acid absorbancy, and the polarization resistance increases due to the increase of surface roughness. The polarization resistance affects current density predominantly at the higher potential than 0.7V becuase the polarization resistance is considrably larger than the electrolyte resistance. Both the electrolyte resistance and the polarization resistance affect current density near 0.7V of the fuel cell operating potential because they have similar values. The electrolyte resistance affects current density predominantly at the lower potential than the fuel cell operating potential because the electrolyte resistance is larger than the polarization resistance.

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Exergetic and Thermoeconomic Analysis of a 200kW Phosphoric Acid Fuel Cell Plant (200kW 인산형 연료전지 발전시스템의 엑서지-열경제학적 해석)

  • Jeon, J.;Kwak, H.;Lee, H.;Choi, D.;Park, D.;Cho, Y.
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.689-696
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    • 2001
  • Exergetic and thermoeconomic analysis were performed for a 200kW Phosphoric Acid Fuel Cell(PAFC) plant which offers many advantage for cogeneration in the aspect of high electrical efficiency and low emission. This analytical study was based on the data obtained by in-field measurement of PC25 fuel cell plant to find whether this system is viable economically. For 100% load condition, the electrical efficiency and the unit cost of electricity are about 45% and 0.032 $/kWh respectively, which turn out to be much better than those for the 1000kW gas turbine cogeneration plant. Further, at lower loads, the unit costs of electricity and hot water increase slightly and consequently more economic operation is possible at any loads.

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Application of Micro Porous Layer (MPL) for Enhance of Electrode Performance in Phosphoric Acid Fuel Cells (PAFCs) (인산형 연료전지(PAFC)의 전극 성능 향상을 위한 미세다공층(MPL)의 적용)

  • Jihun Ha;Sungmin Kang;You-Kwan Oh;Dong-Hyun Peck
    • Journal of the Korean Electrochemical Society
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    • v.27 no.1
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    • pp.32-39
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    • 2024
  • The key components of a Phosphoric acid fuel cell (PAFC) are an electrode catalyst, an electrolyte matrix and a gas diffusion layer (GDL). In this study, we introduced a microporous layer on the GDL of PAFC to enhance liquid electrolyte management and overall electrochemical performance of PAFC. MPL is primarily used in polymer electrolyte membrane fuel cells to serve as an intermediate buffer layer, effectively managing water within the electrode and reducing contact resistance. In this study, electrodes were fabricated using GDLs with and without MPL to examine the influence of MPL on the performance of PAFC. Internal resistance and polarization curves of the unit cell were measured and compared to each other to assess the impact of MPL on PAFC electrode performance. As the results, the application of MPL improved power density from 170.2 to 192.1 mW/cm2. MPL effectively managed electrolyte and water within the matrix and electrode, enhancing stability. Furthermore, the application of MPL reduced internal resistance in the electrode, resulting in sustained and stable performance even during long-term operation.

Simulation Study of the Phosphoric Acid Fuel Cell Stack (인산형 연료전지 스택의 전산모사)

  • Choi, Sungwoo;Lee, Kab soo;Kim, Hwayong
    • Clean Technology
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    • v.7 no.4
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    • pp.243-250
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    • 2001
  • The fuel cell has been continuously studied as environment-compatible alternative energy technology. Lately the basic techniques about stacking and widening are considered to be important for practical use. Although phosphoric acid fuel cell (PAFC) is the most progressed one in the fuel cell technologies, few studies about temperature profile of the stack which can be the basic data for the fuel cell design have been reported yet. In this study, the temperature profile of PAFC stack was simulated. The temperature profiles of stack were obtained at various operating conditions, and when stack is operated the proper position to measure the temperature could be predicted. Also we can propose more effective cooling design. The standard deviation of the temperature profile of the proposed design was is about 50% smaller.

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Fundamental Studies on the Manufactruring of prouse Electrode for Plosphoric Acid Fuel Cell. (인산형 연료전지의 다공성전극 제조에 관한 기초적연구)

  • 김영우;박정일;이주성
    • Journal of the Korean institute of surface engineering
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    • v.22 no.2
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    • pp.55-61
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    • 1989
  • A fuel cell which causes electrochemical ratio of conventional with oxygen consists of mainly there parts, such as electrolyte, fuel and oxidant electrode. IN this paper, most efforts were delivered to manufacturing PETE-bonded gas-diffusion electrode, and preparation methods of the porous electrodes has been discussd. A medio temperature, phosphoric acid fuel cell (PAFC) provided with fuel (hydrogen) and oxygen showed oxygen showed excellent performance characteristics with made electrodes. Performance data obtained from hydrgen-oxygen cell were presented to illustrate their properties. It was found that the optimum amounts of platinum in clectrode for hydrgen-oxygen PAFC were about 3mg/cm3 and the PTFE content of gas diffusion layer and catalyst layer were 25% and 15%, respectively.

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Economic Assessment on an Integrated system of Phosphoric Acid Fuel Cell and Organic Rankine Cycle (인산형 연료전지와 유기랭킨사이클 연계시스템에 대한 경제성 평가)

  • Kim, Deug Soo;Yoo, Hoseon
    • Plant Journal
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    • v.18 no.1
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    • pp.43-49
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    • 2022
  • In this study, the operational characteristics of the 7.48 MW fuel cell power plant consisting of 17 units of 440 kW Phosphoric Acid Fuel Cell (PAFC) in operation since its commercial operation in December 2017 were explained and the heat recovery process of the plat using Organic Rankine Cycle (ORC)was simulated. The fuel cell system performance improvement and economic assessment were analyzed by calculating the amount of heat recovery and electric power available when connecting a 125 kW XLT Model ORC for hot water heat sources with 105℃, 40.8 t/h. The result of the study shows that integrating the 125 kW ORC to PAFC power plant would improve generating efficiency by about 0.6% through annually 851,472 kWh of electricity produced by ORC, and fuel cell and ORC integrated systems were calculated to have a 0.35% higher Internal Return Ratio and more Net Present Value of 1,249 million KRW than not installing ORC despite installation costs.

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Electrical Characteristics of the 5KW PAFC Experimental System (5KW급 인산형 연료전지 발전설비의 전력특성연구)

  • Yoo, S.J.;Choi, S.H.;Kim, Y.T.
    • Proceedings of the KIEE Conference
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    • 1989.07a
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    • pp.9-11
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    • 1989
  • A phosphoric acid fuel cell ( PAFC ) power plant with a capacity of SKW a.c has been constructed for R & D purposes at KIER under a sponsorship of KEPCO. The PAFC power plant has successfully generated an electricity for the first time in Korea. In the paper, the plant configuration and the experimental results ace reported.

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Preparation and Characteristics of a Matrix Retaining Electrolyte for a Phosphoric Acid Fuel Cell Using Non-volatile Solvent, NMP (비휘발성 용매(NMP)를 사용한 인산형 연료전지(PAFC)용 전해질 매트릭스 제조 및 특성)

  • 윤기현;양병덕
    • Journal of the Korean Ceramic Society
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    • v.37 no.1
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    • pp.26-32
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    • 2000
  • Preparation and characteristics of a matrix retaining electrolyte using SiC whisker, PES binder, and NMP(n-methyl-2-pyrrolidone) as a non-volatile solvent for a phosphoric acid fuel cell were investigated. The conditions of binder and plasticizer, and the effects of substituting a volatile solvent by a non-volatile solvent were also studied. The minimum amount of the binder was about 17 wt% for the proper bubble pressure and surrounding SiC whiskers. And the maximum amount of the plasticizer was about 10wt% to be fitted into the polymer chain of the binder. The matrix prepared by using a non-volatile solvent needed longer time to dry, and its pore size was smaller compared with that of the matrix prepared by using volatile solvent. The small pore size resulted in decrease of the overall pore volume. The ionic conductivity in the condition of the same thickness was decreased due to decrease of phosphoric acid absorbancy. As the internal resistance of the electrolyte increased, the fuel cell performance slightly decreased.

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