Energy and exergy analysis of an ethanol reforming process for solid oxide fuel cell applications

Tippawan, Phanicha; Arpornwichanop, Amornchai

doi:10.1016/j.biortech.2014.01.113

Cited by 43 publications

(32 citation statements)

References 25 publications

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“…The comparatively lower values of the exergy efficiency obtained in this work in comparison with what has been reported in the literature [19,20,25] are explained by taking into account that here we only consider the exergy content of pure hydrogen as the evaluation base (not the total hydrogen produced).…”

Section: Effect Of Operational Conditions On Exergy Efficiencycontrasting

confidence: 46%

“…An exergy efficiency of 70% was claimed for the ESR process, considering total hydrogen production via ESR as the main product. In another interesting study, Tippawan et al [25] employed the first and second law of thermodynamics to evaluate energy and exergy performance of an modelled ethanol reforming system in connection with a solid oxide fuel cell (SOFC) with a similar formulation as Casas-Ledón et al [18] and Khila et al [19]. They studied ESR, partial oxidation (POX), and autothermal reforming (ATR) processes as the reforming sections for hydrogen production, and the best efficiency of the system (reforming+SOFC) was stated equal to 60% when ESR was used as the reformer unit.…”

Section: Introductionmentioning

confidence: 99%

“…Chemical exergy occasionally is reported as a sum of two terms, i.e. the standard chemical exergy plus a logarithmic term as a function of the fraction of each substance in a mixture [18,25]:…”

Section: Exergy Analysismentioning

confidence: 99%

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Exergetic study of catalytic steam reforming of bio-ethanol over Pd–Rh/CeO2 with hydrogen purification in a membrane reactor

Hedayati

Corre

Lacarrière

et al. 2015

International Journal of Hydrogen Energy

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In this work, we present the application of exergy analysis in the evaluation of the ethanol steam reforming (ESR) process in a catalytic membrane reactor (CMR) containing Pd-Ag membranes sandwiched by PdRh/CeO 2 catalyst to produce fuel cell grade pure hydrogen (no sweep gas). ESR experiments were performed at T=873-923 K and P=4-12 bar. The fuel was a mixture of ethanol and distilled water with steam to carbon ratio=1.6, 2, and 3. The exergy evaluation of the system is based on the experimental data, where total yields of 3.5 mol H 2 permeated per mol ethanol in feed with maximum hydrogen recuperation of 90% were measured at 923 K and 12 bar. The exergy efficiency of the system was evaluated considering both the insulated reactor (without heat loss), and non-insulated reactor (with heat loss). Exergy efficiency up to around 50% was reached in the case of the insulated reactor at 12 bar and 923 K. It was concluded that the highest amount of exergy was destructed by heat losses. The study showed that the exergy content of the retentate gas can provide the reactor with a notable fraction of its required heat at steady state conditions which can remarkably increase the overall exergy efficiency of the system. In this case, thermal efficiency of the insulated reactor was between 70-90%, which decreased to 40-60% when the heat loss was considered.Keywords: exergy, hydrogen, catalytic membrane reactor, ethanol steam reforming Highlights  Ethanol steam reforming experiments were performed in a membrane reactor  Hydrogen yield of 0.55 and hydrogen recovery 92% were obtained  0.9 L N pure hydrogen per ml of converted ethanol was produced  Exergy efficiency up to 50% was calculated in the case of an insulated reactor  Reactor insulation and retentate gas exergy recovery increased the efficiency of the system are the key factors for system optimization  Heat losses are the main source of exergy loss  The retentate gas has a large amount of recoverable exergy content

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Section: Effect Of Operational Conditions On Exergy Efficiencycontrasting

confidence: 46%

Section: Introductionmentioning

confidence: 99%

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Exergetic study of catalytic steam reforming of bio-ethanol over Pd–Rh/CeO2 with hydrogen purification in a membrane reactor

Hedayati

Corre

Lacarrière

et al. 2015

International Journal of Hydrogen Energy

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“…Another possibility is represented by the use of an external pre-reforming processor for the conversion of ethanol to syngas. However, also the external reformer increases the complexity of the SOFC-based system [18]. Therefore, a practical solution to this issue may be the utilization of a protective layer applied to the anode.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Ni-based alloy/CGO electro-catalysts as protective layer for a solid oxide fuel cell anode fed with ethanol

et al. 2015

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Ni-based alloys were prepared by using the oxalate method and subsequent in-situ reduction. The crystallographic phase and microstructure of the catalysts were investigated. These bimetallic alloys were mixed with gadolinium-doped ceria in order to obtain a composite material with mixed electronic-ionic conductivity. Catalytic and electrocatalytic properties of the composite materials for the conversion of ethanol were investigated. Electrochemical tests were carried out by utilizing the Nibased alloy/CGO cermet as a barrier layer in a conventional anode-supported solid oxide fuel cell (SOFC). A comparative study between the modified cells and a conventional anode-supported SOFC without the protective layer was made. The aim was to efficiently convert the fuel directly into electricity or syngas (H 2 and CO) just before the conventional anode support. In accordance with the exsitu catalytic tests, the SOFC anode modified with Ni-Co/ CGO showed superior performance towards the direct utilization of dry ethanol than the bare anode and that modified with Ni-Cu/CGO. A peak power of 550 mW cm -2 was achieved with the dry ethanol-fed Ni-Co/CGO pre-layer modified-cell at 800°C. A total low frequency resistance of \0.5 X cm 2 at 0.8 V of cell voltage was recorded in the presence of ethanol directly fed to the SOFC.

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“…Reference Topics [38] Thermodynamic analysis and evaluation of bioethanol manufacture [39] Environmental, economic, and exergetic costs and benefits of biodiesel and ethanol biofuels [40] Exergetic analysis of biofuels production [41] Life-cycle analysis and the ecology of biofuels [42] Exergy analysis of enzymatic hydrolysis reactors for transformation of lignocellulosic biomass to bioethanol [43] The GHG (Greenhouse Gas) emissions of cellulosic ethanol supply chains in Europe [35] Exergy and renewability analysis of the ethanol production from banana fruit and its lignocellulosic residues [36] Energy and exergy analysis of an ethanol-fueled solid oxide fuel cell power plant [44] Second-generation bio-ethanol (SGB) from Malaysian palm empty fruit bunch: Energy and exergy analysis [45] Comparative exergy analysis of NREL (National Renewable Energy Laboratory)thermochemical biomass-to-ethanol conversion process designs [46] Improving bioethanol production from sugarcane: Evaluation of distillation, thermal integration and cogeneration systems [47] Exergy analysis and process integration of bioethanol production from acid pre-treated biomass: SHF (Saccharification hydrolysis and fermentation), SSF (Simultaneous saccharification and fermentation) and SSCF (Simultaneous saccharification and cofernentation) pathways [48] Sustainable ethanol production from lignocellulosic biomass-Application of exergy analysis [49] Thermodynamic analysis of lignocellulosic biofuel production via a biochemical process: technology selection and research focus [33] Comparison of combined ethanol and biogas polygeneration facilities using exergy analysis [50] Land-use change and GHG emissions from corn and cellulosic ethanol [51] Possibilities for sustainable biorefineries based on agricultural residues-potential straw-based ethanol production in Sweden [52] Energy and exergy analysis of the combined production process of sugar and ethanol from sugarcane [53] Comparing life cycle assessments of different biofuel options [54] Thermodynamic assessment of lignocellulosic pretreatment methods for bioethanol production via exergy analysis [55] Thermodynamic evaluation of biomass-to-biofuels production systems [56] Exergy analysis of pretreatment processes of bioethanol production based on sugarcane bagasse [57] Energy and exergy analysis of ethanol reforming process …”

Section: Exergy-based Performance Analysismentioning

confidence: 99%

Exergy and CO2 Analyses as Key Tools for the Evaluation of Bio-Ethanol Production

Kang

Tan

2016

Sustainability

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Abstract:The background of bioethanol as an alternative to conventional fuels is analyzed with the aim of examining the efficiency of bioethanol production by first (sugar-based) and second (cellulose-based) generation processes. Energy integration is of paramount importance for a complete recovery of the processes' exergy potential. Based upon literature data and our own findings, exergy analysis is shown to be an important tool in analyzing integrated ethanol production from an efficiency and cost perspective.

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Energy and exergy analysis of an ethanol reforming process for solid oxide fuel cell applications

Cited by 43 publications

References 25 publications

Exergetic study of catalytic steam reforming of bio-ethanol over Pd–Rh/CeO2 with hydrogen purification in a membrane reactor

Exergetic study of catalytic steam reforming of bio-ethanol over Pd–Rh/CeO2 with hydrogen purification in a membrane reactor

Investigation of Ni-based alloy/CGO electro-catalysts as protective layer for a solid oxide fuel cell anode fed with ethanol

Exergy and CO2 Analyses as Key Tools for the Evaluation of Bio-Ethanol Production

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