Thermodynamic Analysis of the Hydrogen Production from Ethanol: First and Second Laws Approaches

Casas-Ledón, Yannay; Arteaga-Pérez, Luis E.; Morales-Perez, Mayra C.; Peralta-Suárez, Luis M.

doi:10.5402/2012/672691

Cited by 9 publications

(25 citation statements)

References 17 publications

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“…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%

“…For reforming processes, Simpson et al [1] modelled the methane steam reforming process and both irreversible chemical reactions and heat losses were identified as the main source of exergy destruction, whereas exhaust gases contained large amounts of chemical exergy. Casas-Ledón et al [18] studied hydrogen production from ESR considering based on the first and the second law of thermodynamics. They evaluated the exergy efficiency of the system at different operational conditions (pressure, temperature, and S/C ratio) considering the unused and destructed exergy during the ESR process.…”

Section: Introductionmentioning

confidence: 99%

“…A comprehensive exergy analysis of the different types of ethanol reforming processes (ESR, POX and ATR) based on a model in Aspen Plus was performed by Khila et al [19]. The same formulation as Casas-Ledón et al [18] was used by Khila et al and they calculated the exergy of the inlet and outlet streams at selected operational conditions, according to hydrogen production per mole of inlet ethanol. An exergy efficiency of 70% was claimed for the ESR process, considering total hydrogen production via ESR as the main product.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the conservation of mass and energy together, exergy analysis is a powerful tool to investigate the imperfections of single components of the system to obtain a clearer understanding of the local irreversibility. This also makes it possible to study the effect of thermodynamic factors on the performance of an energy system to decide on the most favorable operational conditions in terms of process efficiency and energy usage [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…In other words, exergy is the ability of available energy to convert into other forms of energy. Hence, exergy can be conserved only if the process between the environment and the system is reversible [18].…”

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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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%