Comparative Performance Analysis of Internal and External Reforming of Methanol in SOFC-MGT Hybrid Power Plants

Cocco, Daniele; Tola, Vittorio

doi:10.1115/1.2364009

Cited by 22 publications

(8 citation statements)

References 11 publications

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“…This result implies that devices intended to operate with CH 3 OH should employ steps to ensure that the fuel has undergone sufficient preprocessing to inhibit carbon growth. Such steps can include steam reforming, ,, CO 2 reforming, and, in the case of methanol, operating at higher temperatures. , …”

Section: Discussionmentioning

confidence: 99%

Direct, In Situ Optical Studies of Ni−YSZ Anodes in Solid Oxide Fuel Cells Operating with Methanol and Methane

et al. 2010

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Near-infrared imaging and vibrational Raman scattering have been used to measure the susceptibility of Ni-based cermet anodes to carbon formation in solid oxide fuel cells (SOFCs) operating with methane and methanol fuels at 715 °C. These two complementary optical methods afford previously unavailable opportunities to monitor chemical and physical processes occurring in situ and in real time with molecular specificity and spatial resolution. Imaging and spectroscopic data show that when the cell is held at open circuit voltage carbon forms within one minute of methanol or methane being introduced to the anode chamber. Raman spectra identify these deposits as highly ordered graphite based on a single sharp feature in the vibrational spectrum near 1580 cm−1. While graphite formed from methane remains highly ordered regardless of exposure duration, graphite formed from sustained exposure to methanol begins to show evidence of structural disorder inferred from the appearance of a weak feature at 1340 cm−1. This lower frequency vibrational band has been assigned previously to the presence of grain boundaries and/or site defects in a graphite lattice. Correlating the growth of intensity in the Raman spectra with exposure time quantifies the kinetics of carbon deposition and suggests that carbon formed from methanol grows via two distinct mechanisms. Thermal imaging data show that carbon deposition is endothermic and reduces anode temperatures. This effect is more pronounced for methanol (ΔT = −5.5 °C) than methane (ΔT = −0.5 °C). These results agree with data from vibrational Raman experiments showing that exposure to methanol leads to significantly more carbon deposition. Polarizing the cell reduces the amount of carbon deposited. This effect is reversible and more significant for methanol. The effects of the graphite formed from methanol are evident in electrochemical impedance data but less apparent in voltammetry experiments. In contrast, graphite formed from methane has only modest impact on device performance. Collectively, these studies address long-standing questions about the tendency of methanol to form carbon on eletrocatalytic SOFC anodes and the consequences of this chemistry on device performance.

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Section: Discussionmentioning

confidence: 99%

Direct, In Situ Optical Studies of Ni−YSZ Anodes in Solid Oxide Fuel Cells Operating with Methanol and Methane

et al. 2010

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“…In the open literature, it can be seen that a number of studies deal with or discuss different modeling techniques [2][3][4], system levels and concepts [5][6][7][8][9], reforming methods and various fuel influences [10][11][12][13], and part-load performances [14][15][16][17] in the SOFC/GT hybrid systems. These studies were based on the energetic analysis based on the first law of thermodynamics.…”

Section: Introductionmentioning

confidence: 99%

An analysis of SOFC/GT CHP system based on exergetic performance criteria

Akkaya

Şahi̇n

Erdem

2008

International Journal of Hydrogen Energy

157

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“…The models obtained that way are able to reproduce the global electrochemical behavior of fuel cells of a specific type with good accuracy. Examples of semi-empirical models are the work of Campanari [47], Cocco and Tola [48], Hacker et al [49] and Zhang et al [50].…”

Section: Modelling Of Sofc In Literaturementioning

confidence: 99%

Modelling of a solid oxide fuel cell for integrated coal gasification hybrid power plant simulation

Krüger¹

2015

Int. J. Thermo

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Now and in the mid-term future, coal remains an important energy source for electricity generation for reasons of energy supply security and economics. The expectation for low CO2-emissions and high plant efficiencies make solid oxide fuel cells an essential part of numerous innovative power plant concepts. For that reason, simplified and flexible models for solid oxide fuel cells are needed, which can be implemented easily in complex power plant system simulations. A model for a tubular solid oxide fuel cell based on a semi-empirical approach has been developed. The created model is successfully validated with operating data of demonstration plants published in literature. For the target application in a hybrid power plant with high temperature fuel cells, a parametric study of fuel gas composition, operating pressure and temperature, fuel utilization and electrical power density is presented. By means of these, the model of the fuel cell is qualified for implementation in hybrid power plants system models. Additionally, characteristic diagrams obtained by variation of the operating pressure and the fuel utilization are discussed. With the help of the diagrams, the electric and energetic performance of the SOFC over a wide range of these parameters is described by isolines for discrete values of the electrical efficiency and voltage of the fuel cell.

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Comparative Performance Analysis of Internal and External Reforming of Methanol in SOFC-MGT Hybrid Power Plants

Cited by 22 publications

References 11 publications

Direct, In Situ Optical Studies of Ni−YSZ Anodes in Solid Oxide Fuel Cells Operating with Methanol and Methane

Direct, In Situ Optical Studies of Ni−YSZ Anodes in Solid Oxide Fuel Cells Operating with Methanol and Methane

An analysis of SOFC/GT CHP system based on exergetic performance criteria

Modelling of a solid oxide fuel cell for integrated coal gasification hybrid power plant simulation

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