Anode gas recirculation for improving the performance and cost of a 5-kW solid oxide fuel cell system

Torii, Ryohei; Tachikawa, Yuya; Sasaki, Kazunari; Ito, Kohei

doi:10.1016/j.jpowsour.2016.06.045

Cited by 40 publications

(8 citation statements)

References 21 publications

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“…The anode off-gas can be recirculated by means of an ejector or blower. The utilization of ejectors allows for a higher reliability, as they have few -if any -moving parts, as well as for the possibility to recirculate at high temperatures [12]. However, the fluid pressure must be boosted to drive the ejector.…”

Section: Sofc/agrmentioning

confidence: 99%

“…Moreover, the outlet flow rate and pressure cannot be controlled for a common ejector [29]. Meanwhile, when a blower is used to recirculate the gas, the flow rate can be easily controlled [12]. However, as high-temperature recirculation with a blower is still technically challenging, in the present work a low-temperature recirculation is considered.…”

Section: Sofc/agrmentioning

confidence: 99%

“…Simple SOFC concepts based on once-through setups combining reforming and SOFC are already being applied for residential applications [8,9]. The utilization of anode off-gas recirculation offers the potential to increase the efficiency of such systems considerably, an increase in electric efficiency by five to nine percentage points (pp) was reported in literature [10][11][12]. Even higher efficiencies can be reached with concepts applying two-stage conversion [13][14][15] or via coupling of SOFC with gas turbines [16].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Sofc/agrmentioning

confidence: 99%

Section: Sofc/agrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…In this context, chemical energy of glycerol could be efficiently converted into electricity by means of the use of solid oxide fuel cells (SOFCs). SOFCs operate at high temperature and achieve high power generation efficiency without requiring expensive catalysts, such as platinum [6]. Due to elevated operating temperatures, SOFCs are fuel flexible and can be combined with conventional gas turbine power plants (hybrid systems).…”

Section: Introductionmentioning

confidence: 99%

Aproveitamento Energético Eficiente Do Glicerol – Modelamento No Estado Estacionário De Sistema Híbrido De Células a Combustível Do Tipo Óxido Sólido E Turbina a Gás

Silva¹

2019

ABM Proceedings

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Hybrid solid oxide fuel cell/gas turbine systems (SOFC-GT) are promising innovative technology with the potential to boost distributed energy generation, due to high electrical efficiencies achieved, while keeping much lower environmental impact. In this context, the present study provides a steady-state model for a SOFC-GT architecture based on anode gas recirculation concept, with glycerol being used as a fuel. The developed code allows calculating heat and mass balance using system analysis by modeling each module, namely, reformer, SOFC stack, afterburner, heat exchanger, anode gas recirculation blower, turbine and air compressor. Adiabatic reformer was modeled according to entropy maximization technique, allowing a more straightforward integration with SOFC anode, ensuring a faster code execution. The whole process flowsheet diagram (PFD) is provided for a designed 200kW AC SOFC-GT system, yielding 66.6% electrical efficiency. Such a high efficiency is achieved for pressurized system (8 atm), SOFC stack composed of 500 cells, at a power density of 0.75 W cm −2 and single cell voltage of 0.842V. Enhanced electrochemical performance is obtained with the utilization of a new generation of metal-supported SOFC, based on optimized materials LSCM/YSZ/SDCN (lanthanum strontium manganite/yttria stabilized zirconia/samaria-doped ceria mixed with Ni). In addition, two-stage compression and expansion, with proper selection of rotor diameter sizes besides a fully electric technology, could result in compressors and turbines efficiencies of approximately 83% and 85%, respectively.

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“…The fuel utilization rate could be increased by recycling a part of the anode off-gas as fuel, and could achieve highly efficient power generation according to Eq. (1) [8,9]. By contrast, a two-stage stacks technology has been proposed [10] and its advantages have been investigated [11,12].…”

Section: Introductionmentioning

confidence: 99%

Development of a Highly Efficient SOFC Module Using Two‐stage Stacks and a Fuel Regeneration Process

et al. 2017

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A solid oxide fuel cell (SOFC) module using two-stage stacks and a fuel regeneration process between them was developed in this study for the first time, to the best of the authors' knowledge. Upon configuring the first-stage and secondstage stacks and a steam reformer between them in the SOFC module, a gross output power of DC 2.27 kW was generated with gross power generation efficiency of DC 69.2% (lower heating value (LHV)), at a total fuel utilization rate of 86.3%. This technology enables operation at a very high total fuel utilization rate even while operating the stacks at a moderate fuel utilization rate (below 70%). Considering an auxiliary device loss (6%) and inverter loss (5%), the net power generation efficiency is estimated to be AC 61.8% (LHV); hence, the module is considered to exhibit a high power generation efficiency. Further increases in the power generation efficiency could be realized in the future by removing the CO 2 from the anode off-gas during the fuel regeneration process and/or operating the stacks at higher temperatures by decreasing heat leakage from the module.

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Anode gas recirculation for improving the performance and cost of a 5-kW solid oxide fuel cell system

Cited by 40 publications

References 21 publications

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

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

Aproveitamento Energético Eficiente Do Glicerol – Modelamento No Estado Estacionário De Sistema Híbrido De Células a Combustível Do Tipo Óxido Sólido E Turbina a Gás

Development of a Highly Efficient SOFC Module Using Two‐stage Stacks and a Fuel Regeneration Process

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