Carbon deposition thresholds on nickel-based solid oxide fuel cell anodes II. Steam:carbon ratio and current density

Kuhn, Joel; Kesler, Olivera

doi:10.1016/j.jpowsour.2014.07.084

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…Yield is defined as the ratio of the energy amount of output hydrogen and the energy consumption of input methane, and the related equation is shown in Equation (8). According to Kuhn's research, carbon deposition occurs when the S/C ratio is less than 2.5, and when the S/C ratio is more than 4, the heat load of heating water increases and efficiency decreases [46]. Therefore, the SC ratio was fixed at 3 for all subsequent simulations.…”

Section: Calculation Of Reformer Efficiency According To S/c Ratiomentioning

confidence: 99%

Research on Pure Hydrogen Production Using a Fuel-Processing System Combined with a PSA System

Ko,

Lee

2023

Applied Sciences

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Research was conducted to improve the system efficiency of a fuel-processing system combined with a hydrogen-purification system to supply hydrogen to a 10 kW residential building proton-exchange membrane fuel cell (PEMFC). The system consists of a steam-reforming reactor, a water–gas shift reactor, heat exchangers and a pressure swing adsorption (PSA) system, increasing the purity of the produced hydrogen by over 99.97%. Aspen Plus® and Aspen adsorption® simulators were used to optimize operating conditions by calculating thermal efficiency and hydrogen-production yield under various temperature and pressure conditions in the reformer. To optimize the hydrogen-production system, simulations were performed under conditions of 1 to 10 atm and 600 to 1000 °C, and simulations were also performed while maintaining the PSA pressure at 9 atm. The overall system efficiency was expressed as a function of methane conversion, and the methane conversion was expressed as a function of reformer temperature and pressure. The fuel-processing system showed the highest thermal efficiency of 82.40% at a pressure of 1 atm and a temperature range of 800 °C. For the combined system of a fuel-processing system and a hydrogen-purification system, the highest hydrogen-production yield was 43.17% at 800 °C and 1 atm.

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Section: Calculation Of Reformer Efficiency According To S/c Ratiomentioning

confidence: 99%

Research on Pure Hydrogen Production Using a Fuel-Processing System Combined with a PSA System

Ko,

Lee

2023

Applied Sciences

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“…The carbon deposition/coking in the SOFC decreases the active area of the SOFC, which increases the polarization resistance that affects the electrochemical performance of the anode (Thallam Thattai et al, 2017). Hence, avoiding the risk of carbon deposition in the anode inlet/outlet pipes is a major challenge while syngas is flowing through the SOFCs (Kuhn and Kesler, 2014;Kuhn and Kesler, 2015). Since Ni-GDC is the assumed anode material in the present study as shown in Table 2, it is necessary to perform the carbon deposition analysis to indicate any risk associated with it.…”

Section: Carbon Deposition Analysismentioning

confidence: 99%

“…The risk of carbon deposition in this case could be reduced by mixing the bio syngas with the steam (Kuhn and Kesler, 2015). But the steam should then be extracted from the system, and this would lead to a reduction in the net electrical efficiency (Thallam Thattai et al, 2017).…”

Section: Effect Of Various Sofc Operating Temperatures On Chp Exergy ...mentioning

confidence: 99%

Negative Emission Power Plants: Thermodynamic Modeling and Evaluation of a Biomass-Based Integrated Gasification Solid Oxide Fuel Cell/Gas Turbine System for Power, Heat, and Biochar Co-Production—Part 1

et al. 2022

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This article is the first of a two-part series presenting the thermodynamic evaluation and techno-economics of developing negative-emission power plants. The aim of this research is to evaluate the potential of biochar co-production in negative-emission power plants based on biomass-fed integrated gasification solid oxide fuel cell systems with carbon capture and storage (BIGFC/CCS) units. The influence of two gasification agents, namely, air and steam-oxygen, on the proposed system is investigated. In Part I, we present the thermodynamic models. A sensitivity analysis is carried out to investigate the system response to stepwise increase in biochar co-production (up to 10% by weight). Providing a secondary oxy-combustor in the steam-oxygen gasification case has been shown to be a solution to meet the heat requirements of the allothermal gasification process. A comprehensive exergy analysis indicated significant efficiency improvement for the steam-oxygen gasification case. The results show that the biomass steam-oxygen gasification yields the higher electrical exergy efficiency (48.3%) and combined heat and power (CHP) exergy efficiency (54.6%) for the similar rates of biochar co-production. The specific power output per unit of CO2 stored is 2.65 MW/(kg/s) and 3.58 MW/(kg/s) for the air and steam-oxygen gasification cases, respectively, when the biochar is co-produced at 10% by weight for the given biomass flow of 20 kg/s. Moreover, the total CO2 stored due to the proposed system is calculated as 133.9 t/h, and it is estimated to remove 1.17 Mt of CO2 from the atmosphere annually (when the biochar-based carbon storage is also considered). The models are used for the techno-economic analysis presented in Part II of the series.

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“…Those reactions occur in the gas phase and lead to the formation of solid carbon, either amorphous (graphite) or in the form of nanotubes/whiskers 20 . Moreover, the kinetic of coking reactions is favored by the presence of the Nickel catalyst.…”

Section: Carbon-induced Degradationmentioning

confidence: 99%

Advancements regarding in-operando diagnosis techniques for solid oxide cells NiYSZ cermets

Baldinelli

Barelli

Bidini

et al. 2019

AIP Conference Proceedings

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Carbon deposition thresholds on nickel-based solid oxide fuel cell anodes II. Steam:carbon ratio and current density

Cited by 11 publications

References 24 publications

Research on Pure Hydrogen Production Using a Fuel-Processing System Combined with a PSA System

Research on Pure Hydrogen Production Using a Fuel-Processing System Combined with a PSA System

Negative Emission Power Plants: Thermodynamic Modeling and Evaluation of a Biomass-Based Integrated Gasification Solid Oxide Fuel Cell/Gas Turbine System for Power, Heat, and Biochar Co-Production—Part 1

Advancements regarding in-operando diagnosis techniques for solid oxide cells NiYSZ cermets

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