Development and Test of a Solid Oxide Fuel Cell Subsystem with a Low Temperature Anode Off-Gas Recirculation

Peters, Roland; Engelbracht, Maximilian; Tiedemann, Wilfried; Hoven, Ingo; Deja, Robert; Nguyen, Van Nhu; Blum, Ludger; Stolten, Detlef

doi:10.1149/07801.2489ecst

Cited by 13 publications

(10 citation statements)

References 5 publications

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“…Figure 9 shows the comparison between the measured isentropic total to total fan efficiencies and power as defined in eqs. (2) to (4). The experiments mean ambient pressure was 0.965 bar ± 0.004 bar, the total fan inlet temperature 200 • C ± 2 • C, and the rotational speed 50 krpm, 70 krpm, ..., 150 krpm, and 168 krpm ± 1 krpm.…”

Section: Evaluation Of the Heat Dissipation By Shaft Lossesmentioning

confidence: 99%

“…Their conclusion is that an electrical net efficiency of up to 64.9 % and a utilization ratio of up to 97.2 % are theoretically possible. Peters et al [4] experimentally demonstrated the technical feasibility of a 2.5 kW e SOFC stack with AOR reaching an electrical net efficiency of 58.5 %. They claim that if a new stack had been used instead of an aged one the efficiency would have been at least 5 points higher.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical and Experimental Investigation of a Small-Scale, High-Speed, and Oil-Free Radial Anode Off-Gas Recirculation Fan for Solid Oxide Fuel Cell Systems

Wagner

herle

Schiffmann

2020

Journal of Engineering for Gas Turbines and Power

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The Laboratory for Applied Mechanical Design (LAMD) designed, manufactured, and experimentally tested a novel recirculation fan for a 10 kWe solid oxide fuel cell (SOFC). The fan uses oil-free bearings, more specifically herringbone-grooved journal and spiral-grooved thrust gas bearings. The radial inducer-less fan with a tip diameter of 19.2 mm features backward-curved prismatic blades with constant height. Prior to coupling the recirculation fan with the SOFC, the fan was experimentally characterized with air at 200 °C. At the nominal point of 168 krpm, the measured inlet mass flow rate is 4.9 kgh–1, the total-to-total pressure rise 55 mbar, the isentropic total-to-total efficiency 55%, and the power 18.3 W. This paper compares the experimental data toward a computational fluid dynamic simulation of the full fan impeller and volute suggesting an excellent correlation at the nominal point which validates the numerical approach. However, the heat flows crossing the fan fluid domain have an increased effect at off-design conditions; thus, the experimental results need careful consideration. The fan backface leakage has negligible impact on the measurements.

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Section: Evaluation Of the Heat Dissipation By Shaft Lossesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigation of a Small-Scale, High-Speed, and Oil-Free Radial Anode Off-Gas Recirculation Fan for Solid Oxide Fuel Cell Systems

Wagner

herle

Schiffmann

2020

Journal of Engineering for Gas Turbines and Power

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“…While market penetration of small scale solid oxide fuel cell systems accelerates , efforts are being devoted to increasing stacking and reaching higher efficiencies in SOFC systems through the implementation of recirculation loops . On the electrolysis side, tremendous progress has recently been achieved in demonstrating commercially viable lifetimes and scaling up SOEC technology .…”

Section: Introductionmentioning

confidence: 99%

Transition Cycles during Operation of a Reversible Solid Oxide Electrolyzer/Fuel Cell (rSOC) System

et al. 2019

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Reversible high temperature solid oxide cells (rSOC) can be operated both in the fuel cell (SOFC) and the electrolysis mode (SOEC). This specificity is a promising way to either store intermittent renewable energy surpluses by producing H2, or generate electricity from H2 or any other fuel locally available (CH4, biogas) when demand overtakes the local production. Therefore, rSOC technology could reinforce autonomy and flexibility in buildings, eco‐districts, up to industrial sites and local energy grids powered by intermittent renewable energies. Such a storage solution complements batteries, displays flexible energy storage durations, from a few hours up to seasonal cycles, and allows decorrelating power and storage capacity. Nonetheless, experiments are needed to assess whether rSOC systems can accommodate the surrounding environment and switch rapidly between various power levels and operating modes. An rSOC system has been built and its ability to operate in both electrolysis and fuel cell modes has been demonstrated. The present work is focused on transitioning between 3 operating modes (SOEC, SOFC operated in H2, SOFC operated in CH4), each displaying 3 power levels. The results show that all transition cycles could be done in 3 to 10 min without negatively affecting short term stack performances.

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“…The basic approach of improving the efficiency of simple once-through SOFC systems is the increase of the global fuel utilization FU while maintaining a suitable local fuel utilization FU at stack level. Two different pathways have been discussed in literature: (i) single-stage SOFC module with anode off-gas recirculation [25][26][27], and (ii) two-stage SOFC module with a fuel regenerator between the modules [13][14][15]28].…”

Section: Sofc Systemsmentioning

confidence: 99%

“…After that, the air stream is heated up by the hot Fig. 1 Flowsheet of the considered SOFC/AGR system according to Peters et al [25].…”

Section: Sofc/agrmentioning

confidence: 99%

Modeling of a Novel Atmospheric SOFC/GT Hybrid Process and Comparison with State‐of‐the‐Art SOFC System Concepts

et al. 2020

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A novel concept for an atmospheric solid oxide fuel cell (SOFC) hybrid system applying a sub-atmospheric gas turbine is proposed. Based on a developed process model suitable operating conditions are studied. The resulting performance is compared to different state-of-the-art SOFC system concepts. The comparison shows that pressurized SOFC/GT systems offer the highest electric efficiency. The novel concept as well as a two-stage SOFC system offer lower efficiencies, but still well above 60%. However, avoiding the complex system requirements of pressurized SOFC/GT systems, these concepts are promising for highly efficient electricity generation.

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Development and Test of a Solid Oxide Fuel Cell Subsystem with a Low Temperature Anode Off-Gas Recirculation

Cited by 13 publications

References 5 publications

Theoretical and Experimental Investigation of a Small-Scale, High-Speed, and Oil-Free Radial Anode Off-Gas Recirculation Fan for Solid Oxide Fuel Cell Systems

Theoretical and Experimental Investigation of a Small-Scale, High-Speed, and Oil-Free Radial Anode Off-Gas Recirculation Fan for Solid Oxide Fuel Cell Systems

Transition Cycles during Operation of a Reversible Solid Oxide Electrolyzer/Fuel Cell (rSOC) System

Modeling of a Novel Atmospheric SOFC/GT Hybrid Process and Comparison with State‐of‐the‐Art SOFC System Concepts

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