Extensive analysis of large planar SOFC: Operation with humidified methane and carbon monoxide to examine carbon deposition based degradation

Stoeckl, Bernhard; Subotić, Vanja; Reichholf, David; Schroettner, Hartmuth; Hochenauer, Christoph

doi:10.1016/j.electacta.2017.09.026

Cited by 72 publications

(47 citation statements)

References 39 publications

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“…Before operation on syngas, I‐V curves were recorded. Besides the aforementioned tests with humidified hydrogen for comparability with the initial performance characterization at Jülich, a mixture of 45% H 2 and 55% N 2 was chosen to serve as a reference for the degradation of the stack . The reference mixture was chosen to avoid the removal of deposited carbon while measuring I‐V curves.…”

Section: Experimental Investigation and Methodologymentioning

confidence: 99%

Effect of internal hydrocarbon reforming during coupled operation of a biomass gasifier with hot gas cleaning and SOFC stacks

Fischer

Hauser

Hauck

et al. 2019

Energy Science & Engineering

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In the context of energy transition and climate change, a combination of highly efficient modern solid oxide fuel cells (SOFC) and thermo‐chemical conversion of biogenic residues could complement other intermittent renewable sources such as wind and solar. In order to reduce required gas cleaning efforts and to increase the process efficiency, the influence of hydrocarbons on SOFC performance is experimentally investigated in this study. For the first time, the operation of Ni/YSZ anode‐supported cells in Jülich F10 stacks is performed with pre‐reformed and with bio‐syngas containing full hydrocarbon content at realistic current densities. Sulfur and other impurities were removed in both cases. No degradation could be observed within normal operation on clean gas. With the tar reformer bypassed, the pressure drop over the stack increased due to severe carbon deposition on the anode substrate and the nickel current collector mesh inside the SOFC stack, so that operation had to be terminated after five hours. This behavior is different from single‐cell tests, where electrochemical degradation is the limiting factor. The results show that improvements are not only necessary for cell materials and that future research must also consider other stack components.

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Section: Experimental Investigation and Methodologymentioning

confidence: 99%

Effect of internal hydrocarbon reforming during coupled operation of a biomass gasifier with hot gas cleaning and SOFC stacks

Fischer

Hauser

Hauck

et al. 2019

Energy Science & Engineering

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“…A solid oxide fuel cell (SOFC) is a clean power generation system that has a high efficiency because it directly converts the chemical energy of fuels into electricity. Fuel flexibility is an important advantage of SOFC, and theoretically, any substance that can be oxidized, such as solid carbon, ammonia, carbon monoxide, ethanol, or other hydrocarbons, can be used as a fuel in an SOFC. A high‐temperature SOFC (HT‐SOFC; higher than 800°C) can directly generate electricity using a high‐temperature raw COG after the initial dust removal.…”

Section: Introductionmentioning

confidence: 99%

“…Coke production results in the emission of coke oven gas (COG), a mixture of H 2 , CH 4 , and a small amount of unsaturated hydrocarbons. For every 500 million tons of coke that are produced, 210 billion cubic metres of COG are released as a by-product.…”

Section: Introductionmentioning

confidence: 99%

“…For every 500 million tons of coke that are produced, 210 billion cubic metres of COG are released as a by-product. 1 Since COG is rich in H 2 and CH 4 , it is a promising fuel with a specific heat in the range of 16 720 to 18 810 kJ m −3 . In the past, COG was often used as a civil gas as a heat source after undergoing a series of cooling and purification processes, such as spraying with an ammonia solution to remove tar.…”

Section: Introductionmentioning

confidence: 99%

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A strategy to reduce the impact of tar on a Ni ‐ YSZ anode of solid oxide fuel cells

Chen

Guo

et al. 2019

Int J Energy Res

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Summary High‐temperature raw coke oven gas (COG) is a promising fuel for use in solid oxide fuel cells (SOFCs) because it is rich in both hydrogen (55%‐60%) and methane (23%‐27%). However, the tar present in COG limits its ability to directly generate power using state‐of‐art SOFCs because the presence of tar limits the cell's performance and stability. In this work, a strategy is presented in the attempt to reduce the influence of tar on SOFCs by applying a La0.7Sr0.3MnO3 catalyst as a protective layer for the cell. The results showed that 44‐g Nm−3 toluene had a profoundly negative effect on the performance of a conventional cell, which showed severely reduced performance after only 1.4 hours of exposure to toluene‐contaminated hydrogen. In contrast, the catalyst‐modified cell showed good stability for at least 110 hours under the same conditions. This work provides a promising route to directly utilize raw COG as an SOFC fuel that is also suitable for biosyngas.

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“…Solid Oxide Fuel Cells, in contrast to PEMFCs, can be fed directly with hydrocarbon fuels containing methane, carbon monoxide or even carbon dioxide generated by reformers (Barelli et al 2017;D'Andrea et al, 2017;Kang et al 2008;Stoeckl et al, 2017). No need to eliminate CO through catalytic reactors makes that as a main advantage of using SOFCs.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics calculation of a planar solid oxide fuel cell design running on syngas

Pianko‐Oprych¹,

Zinko²,

Jaworski³

2017

Chemical and Process Engineering

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The present study deals with modelling and validation of a planar Solid Oxide Fuel Cell (SOFC) design fuelled by gas mixture of partially pre-reformed methane. A 3D model was developed using the ANSYS Fluent Computational Fluid Dynamics (CFD) tool that was supported by an additional Fuel Cell Tools module. The governing equations for momentum, heat, gas species, ion and electron transport were implemented and coupled to kinetics describing the electrochemical and reforming reactions. In the model, the Water Gas Shift reaction in a porous anode layer was included. Electrochemical oxidation of hydrogen and carbon monoxide fuels were both considered. The developed model enabled to predict the distributions of temperature, current density and gas flow in the fuel cell.

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Extensive analysis of large planar SOFC: Operation with humidified methane and carbon monoxide to examine carbon deposition based degradation

Cited by 72 publications

References 39 publications

Effect of internal hydrocarbon reforming during coupled operation of a biomass gasifier with hot gas cleaning and SOFC stacks

Effect of internal hydrocarbon reforming during coupled operation of a biomass gasifier with hot gas cleaning and SOFC stacks

A strategy to reduce the impact of tar on a Ni ‐ YSZ anode of solid oxide fuel cells

Computational Fluid Dynamics calculation of a planar solid oxide fuel cell design running on syngas

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