Thermodynamics of SOFC efficiency and fuel utilization as functions of fuel mixtures and operating conditions

Zhu, Huayang; Kee, Robert J.

doi:10.1016/j.jpowsour.2006.05.006

Cited by 68 publications

(55 citation statements)

References 10 publications

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“…For a SC-SOFC, the best efficiency occurs at the maximum specific power. It is due to that the cell power output does not significantly depend on the methane consumed by reforming reaction and the generated heat by system reactions (reforming reaction and electrochemical reactions) is not used for some type of cogeneration [5,18].…”

Section: Electrical Characterisationmentioning

confidence: 99%

Anode‐supported SOFC Operated Under Single‐chamber Conditions at Intermediate Temperatures

Morales

Roa

Capdevila³

et al. 2010

Fuel Cells

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Anode-supported SOFC was fabricated using gadolinia\ud doped ceria (GDC) as the electrolyte (15 lm of thickness),\ud Ni-GDC as the anode and La0.5Sr0.5CoO3 – d-GDC as the\ud cathode. Catalytic activities of the electrodes and electrical\ud properties of the cell were determined, using mixtures of\ud methane + air, under single-chamber conditions. This work\ud assessed with special and wide emphasis the effect of temperature,\ud gas composition and total flow rate on the cell performance.\ud As a result, operational temperature range of the\ud fuel cell was approximately between 700 and 800 °C, which\ud agrees with the results corresponding to the catalytic activities\ud of electrodes. While Ni-GDC anode was enough active\ud towards methane partial oxidation at cell temperatures\ud higher than 700 °C, the LSC-GDC cathode was enough inactive\ud towards partial and total oxidation of methane at cell\ud temperatures lower than 800 °C. Under optimised gas compositions\ud (CH4/O2 ratio (1) and total flow rate\ud ((530 mL min–1), power densities of 145 and 235Peer ReviewedPostprint (published version

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Section: Electrical Characterisationmentioning

confidence: 99%

Anode‐supported SOFC Operated Under Single‐chamber Conditions at Intermediate Temperatures

Morales

Roa

Capdevila³

et al. 2010

Fuel Cells

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“…A SOFC is an electrochemical-conversion DER device that produces electricity directly from a highly efficient and eco-friendly process of fuel oxidation, and has high fuel-flexibility, high energy efficiency, low environmental impact, and a long lifespan [7][8][9]. Prior research has found biogas to have great potential as fuel for SOFCs, with energy efficiency of 55-65% or better [10], and that SOFC-based multi-generation systems can achieve higher efficiency (72-90%) than traditional thermal power generators (35-45%) [11], in addition to reducing the emission of greenhouse gases (GHGs) and gaseous pollutants (e.g., NO x and SO 2 ) [12].…”

Section: Introductionmentioning

confidence: 99%

A Solid Oxide Fuel Cell (SOFC)-Based Biogas-from-Waste Generation System for Residential Buildings in China: A Feasibility Study

Wang

Wei

2018

Sustainability

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Abstract:The building sector consumes a great deal of energy and generates organic waste, and thus has been a cause of considerable environmental concern. One distributed-energy technique, solid oxide fuel cell (SOFC)-based biogas-from-waste generation, has shown promise for waste treatment as well as energy saving in buildings. This study proposes a high-efficiency cooling, heating and electricity-generation system with an SOFC-absorption water-cooled tri-generation configuration. Operations data from a typical high-rise commercial building in Shanghai were analyzed as a case study of the proposed system's economic, environmental, and social feasibility in China. The results indicated that its economic performance was satisfactory, with a short payback period of less than one year if subsidized. Additionally, the system was found to achieve high efficiency: i.e., 85%, as compared to approximately 40% achieved by conventional combustion-powered systems. Finally, in terms of social feasibility, survey respondents not only expressed positive overall attitudes towards the application of the system, but also raised concerns about its long-term operating costs. Given that foreseeable technological advancements promise greater flexibility and reduced space requirements, these results imply that the proposed integrated SOFC multi-generation system will be well-suited to future infrastructure and building projects in China.

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“…The system analysis in the abovementioned works is, among others, based on efficiency and power analysis. Zhu and Kee [29] presented a model of SOFC efficiency and fuel utilization. They showed that maximal possible efficiency is independent of actual system design, i.e.…”

Section: Introductionmentioning

confidence: 99%

An afterburner-powered methane/steam reformer for a solid oxide fuel cells application

et al. 2018

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Solid oxide fuel cell (SOFC) systems can be fueled by natural gas when the reforming reaction is conducted in a stack. Due to its maturity and safety, indirect internal reforming is usually used. A strong endothermic methane/steam reforming process needs a large amount of heat, and it is convenient to provide thermal energy by burning the remainders of fuel from a cell. In this work, the mathematical model of afterburner-powered methane/steam reformer is proposed. To analyze the effect of a fuel composition on SOFC performance, the zero-dimensional model of a fuel cell connected with a reformer is formulated. It is shown that the highest efficiency of a solid oxide fuel cell is achieved when the steam-to-methane ratio at the reforming reactor inlet is high. List of symbols a, b reaction orders, (-)Tafel equation coefficients, (V) C p constant pressure specific heat, (J molFaraday constant, F = 96485.3329 C mol −1Marcin Mozdzierz

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Thermodynamics of SOFC efficiency and fuel utilization as functions of fuel mixtures and operating conditions

Cited by 68 publications

References 10 publications

Anode‐supported SOFC Operated Under Single‐chamber Conditions at Intermediate Temperatures

Anode‐supported SOFC Operated Under Single‐chamber Conditions at Intermediate Temperatures

A Solid Oxide Fuel Cell (SOFC)-Based Biogas-from-Waste Generation System for Residential Buildings in China: A Feasibility Study

An afterburner-powered methane/steam reformer for a solid oxide fuel cells application

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