A novel approach to the experimental study on methane/steam reforming kinetics using the Orthogonal Least Squares method

Ściążko, Anna; Komatsu, Yosuke; Brus, Grzegorz; Kimijima, Shinji; Szmyd, Janusz S.

doi:10.1016/j.jpowsour.2014.03.097

Cited by 38 publications

(30 citation statements)

References 21 publications

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“…Therefore, the rate equation (see Eq. 9) takes the following form: has been determined using the method described in references [27,[32][33][34]. In this method, the water-gas-shift reaction (8) is assumed to be in equilibrium because of the high temperature inside the reactor.…”

Section: Reaction Rate Equationmentioning

confidence: 99%

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Towards a Thermal Optimization of a Methane/Steam Reforming Reactor

Mozdzierz

Brus

Ściążko

et al. 2016

Flow Turbulence Combust

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Plug-flow reactors are very common in methane/steam reforming applications. Their operation presents many challenges, such as a strong dependence on temperature and inlet composition distribution. The strong endothermic steam reforming reaction might result in a temperature drop at the inlet of the reactor. The strong non-uniform temperature distribution due to an endothermic chemical reaction can have tremendous consequences on the operation of the reactor, such as catalyst degradation, undesired side reactions and thermal stresses. One of the possibilities to avoid such unfavorable conditions and control thermal circumstances inside the reforming reactor is to use it as a fuel processor in the solid oxide fuel cell (SOFC) system. The heat generated by exothermic electrochemical SOFC reactions can support the endothermic reforming reaction. Furthermore, the thermal effects of electrochemical reactions help to shape the uniform temperature distribution. To examine thermal management issues, a detailed modeling and corresponding numerical analyses of the phenomena occurring inside the internal reforming system is required. This paper presents experimental and numerical studies on the methane/steam reforming process inside a plug-flow reactor. Measurements including different thermal boundary conditions, the fuel flow rate and the steam-to-methane ratios were performed. The reforming rate equation derived from experimental data was used in the numerical model to predict gas composition and temperature distribution along the steam reforming reactor. Finally, an attempt was made to control the temperature distribution by adopting locally controlled heating zones and non-uniform catalyst density distributions.

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Section: Reaction Rate Equationmentioning

confidence: 99%

“…The reaction constant k is constant for the given temperature, therefore A and E can be determined from the Arrhenius plot. The generalized least squares method, described in references [34,35], was used to correct the experimental data.…”

Section: Reaction Rate Equationmentioning

confidence: 99%

Towards a Thermal Optimization of a Methane/Steam Reforming Reactor

Mozdzierz

Brus

Ściążko

et al. 2016

Flow Turbulence Combust

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“…Różni autorzy (zestawienie w [8]) przedstawiają różne parametry kinetyki reakcji, stąd potrzeba przeprowadzenia eksperymentu w celu wyznaczenia kinetyki procesu charakteryzującej badany problem. Schemat układu pomiarowego pokazano na rysunku 1.…”

Section: Układ Eksperymentalnyunclassified

“…Parametry kinetyczne równania opisującego szybkość reakcji reformingu paliwa zostały wyznaczone za pomocą metody najmniejszych kwadratów oraz dzięki wykreśleniu wykresu Arrheniusa ( [3], [8]). Ostateczne równanie opisują-ce szybkość reakcji ma postać: …”

Section: Układ Eksperymentalnyunclassified

Wpływ warunków brzegowych na rozkład pola temperatury w przepływowym reaktorze do parowego reformingu metanu

Mozdzierz¹,

Brus²,

Ściążko³

et al. 2014

ZN PRz Mechanika

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Jedną z zalet wysokotemperaturowych ogniw paliwowych ze stałym elektrolitem tlenkowym SOFC jest elastyczność w doborze paliw, w szczególności możliwość wykorzystania węglowodorów. Dla ogniw paliowych zasilanych węglowodorami możliwa jest konwersja paliwa na drodze reformingu zewnętrznego bądź wewnętrznego. W przypadku systemu z połączeniem wewnętrznym ciepło pochodzące z pracującego stosu ogniw paliwowych może zostać efektywnie wykorzystane w endotermicznej reakcji reformingu. Opracowanie tegoż systemu zależy od rozmieszczenia elementów pod kątem optymalizacji transportu ciepła w układzie, stresu termicznego wywieranego na poszczególne elementy, osadzania węgla, stopnia polaryzacji elektrod, kosztów oraz efektywności systemu. W pracy przedstawiono badania eksperymentalne na podstawie których zbudowano matematyczny model procesu reformingu, a także przeprowadzono analizę numeryczną wpływu warunków brzegowych oraz parametrów procesu na rozkład pola temperatury w reaktorze podczas reakcji parowego reformingu metanu.

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“…Brus [3] experimentally investigated reforming kinetics on the Ni/SDC catalyst and successfully implemented it into the computational fluid dynamics (CFD) model of the methane/steam reformer which can be used in combination with high-temperature fuel cells. Sciazko with coworkers [23] analyzed the kinetics of methane/steam reforming reaction using the generalized least squares method for SOFC modeling. Mozdzierz et al [15] conducted parametric studies on the methane/steam reforming reaction and concluded that the adaptation of heating zones and localized catalyst density can significantly help in process control.…”

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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A novel approach to the experimental study on methane/steam reforming kinetics using the Orthogonal Least Squares method

Cited by 38 publications

References 21 publications

Towards a Thermal Optimization of a Methane/Steam Reforming Reactor

Towards a Thermal Optimization of a Methane/Steam Reforming Reactor

Wpływ warunków brzegowych na rozkład pola temperatury w przepływowym reaktorze do parowego reformingu metanu

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

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