Thermal modeling and efficiency assessment of an integrated biomass gasification and solid oxide fuel cell system

El‐Emam, Rami S.; Dinçer, İbrahim

doi:10.1016/j.ijhydene.2015.02.061

Cited by 51 publications

(8 citation statements)

References 43 publications

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“…For the dense bed zone, where volatilization and drying occur, bubbling fluidized-type zone is considered. The axial variation of the species concentration through the bed height can be described by the following differential equations for the bubble and emulsion phases, respectively [8][9][10][11]:…”

Section: Modeling and Analysesmentioning

confidence: 99%

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Modeling of Fluidized Bed Gasification of Rice Straw in Egypt

El‐Emam

Dinçer

2015

Progress in Clean Energy, Volume 1

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Useful energy can be extracted from agricultural waste and residues instead of the uncontrolled burning that causes severe harm to the environment. Rice straw can be combusted in a fluidized bed producing useful heat with better control of emissions. One of the most promising alternatives is converting biomass into a more energy-dense fuel with a higher heating value through gasification. This study presents a one-dimensional model of atmospheric bubbling fluidized bed and investigates the effect of different operating parameters on the temperature profile and gas species concentrations through the fluidized bed in the gasification process through concentration and energy balance equations. The model is validated with data and measurements from the literature. The temperature profiles show a peak temperature value occurring early in the freeboard zone. Both the value and position of the peak occurrence are affected by the operation and fluidization condition.

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Section: Modeling and Analysesmentioning

confidence: 99%

“…where M s is in kg/m 2 s and is the function of the initial mass flux at the bed surface which is calculated as follows [11]:…”

Section: Modeling and Analysesmentioning

confidence: 99%

Modeling of Fluidized Bed Gasification of Rice Straw in Egypt

El‐Emam

Dinçer

2015

Progress in Clean Energy, Volume 1

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“…El‐Emam and Dincer 9 introduced an SOFC‐based system and developed it in a controlled manner. They demonstrate the illustrated presentation and read the study of the different types of works under different conditions.…”

Section: Introductionmentioning

confidence: 99%

Development and evaluation of an integrated solid oxide fuel cell system for medium airplanes

Evrin

Dinçer

2020

Int J Energy Res

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This paper concerns a solid oxide fuel cell (SOFC) based integrated powering system for a medium-sized airplane and analyzes it thermodynamically for its performance assessment and evaluation. It further investigates the system in relation to aircraft operating conditions and provides the conceptual solutions for heating and cooling at various temperatures. The results of the energy and exergy analyses and performance assessments of the proposed integrated system are presented and discussed. The exergy and energy efficiencies of the main components are calculated and observed for the SOFCs with the maximum values of 84.54% and 80.31%, respectively. The present integrated system has overall energy and exergy efficiencies of 57.53% and 47.18%, respectively. Furthermore, it is found that an increase in the reforming temperature ratio can improve the hydrogen yield. However, when the system is operated at a temperature higher than 800 C, the hydrogen yield decreases since a reverse water gas shift reaction is more pronounced. Moreover, the SOFC shows the best performance at 800 C with a maximum power density of 1.23 W/cm 2 .

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“…Numerous efforts have been made towards the understanding of the fuel cell electrical efficiency [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Lutz et al performed a thermodynamic analysis and concluded that the maximum fuel cell efficiency is equivalent to the Carnot cycle with the high temper-ature reservoir set at the fuel combustion temperature [3].…”

Section: Introductionmentioning

confidence: 99%

“…The cell efficiency may thus be overestimated. In addition, the maximum cell efficiency cannot be reliably determined without considering the heating requirement of the fuel and air streams or with the assumption of a negligible oxygen utilization [8,11]. The fuel and air streams heating requirement has been considered in a recent study [14], but the study is limited to hydrogen fuel and does not consider the waste heat reuse that is bound to underestimate the fuel cell efficiency.…”

Section: Introductionmentioning

confidence: 99%

Maximum thermodynamic electrical efficiency of fuel cell system and results for hydrogen, methane, and propane fuels

Mao

Xiao

Lin

2018

Chinese Journal of Chemical Physics

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The maximum electrical efficiency of fuel cell system, η max e , is important for the understanding and development of the fuel cell technology. Attempt is made to build a theory for η max e by considering the energy requirement of heating the fuel and air streams to the fuel cell operating temperature T. A general thermodynamic analysis is performed and the energy balances for the overall operating processes of a fuel cell system are established. Explicit expressions for the determination of η max e are deduced. Unlike the Carnot efficiency, η max e is found to be fuel specific. Except for hydrogen fuel, chemical equilibrium calculations are necessary to compute η max e. Analytical solutions for the chemical equilibrium of alkane fuels are presented. The theoretical model is used to analyze the effects of T and the steam contents of CH 4 , C 3 H 8 , and H 2 on η max e for systems with various degrees of waste heat recovery. Contrary to the common perception concerning methane and propane fuels, η max e decreases substantially with the increase of T. Moreover, η max e of hydrogen fuel can be higher than that of methane and propane fuels for a system with a medium level of waste heat recovery and operated at 700 • C≤T ≤900 • C.

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Thermal modeling and efficiency assessment of an integrated biomass gasification and solid oxide fuel cell system

Cited by 51 publications

References 43 publications

Modeling of Fluidized Bed Gasification of Rice Straw in Egypt

Modeling of Fluidized Bed Gasification of Rice Straw in Egypt

Development and evaluation of an integrated solid oxide fuel cell system for medium airplanes

Maximum thermodynamic electrical efficiency of fuel cell system and results for hydrogen, methane, and propane fuels

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