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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Development of Anode Gas Recycle System Using Ejector for 1 kW Solid Oxide Fuel Cell

[+] Author and Article Information
Soumei Baba

Thermal and Fluid System Group,
Energy Technology Research Institute,
National Institute of Advanced Industrial Science
and Technology (AIST),
1-2-1 Namiki, Tsukuba-shi,
Ibaraki 305-8564, Japan
e-mail: soumei.baba@aist.go.jp

Nariyoshi Kobayashi

Thermal and Fluid System Group,
Energy Technology Research Institute,
National Institute of Advanced Industrial Science
and Technology (AIST),
1-2-1 Namiki, Tsukuba-shi,
Ibaraki 305-8564, Japan
e-mail: nariyoshi-kobayashi@aist.go.jp

Sanyo Takahashi

Thermal and Fluid System Group,
Energy Technology Research Institute,
National Institute of Advanced Industrial Science
and Technology (AIST),
1-2-1 Namiki, Tsukuba-shi,
Ibaraki 305-8564, Japan
e-mail: takahashi.sanyo@aist.go.jp

Satoshi Hirano

Thermal and Fluid System Group,
Energy Technology Research Institute,
National Institute of Advanced Industrial Science
and Technology (AIST),
16-1 Onogawa, Tsukuba-shi,
Ibaraki 305-8569, Japan
e-mail: hirano.s@aist.go.jp

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 11, 2014; final manuscript received July 16, 2014; published online September 10, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(2), 021504 (Sep 10, 2014) (9 pages) Paper No: GTP-14-1371; doi: 10.1115/1.4028361 History: Received July 11, 2014; Revised July 16, 2014

An anode gas recycle (AGR) system using an ejector for 1 kW solid oxide fuel cells (SOFCs) was developed to increase the electrical efficiency of combined power generation. We call this an AGR–SOFC. The effects of recirculation ratio, externally steam feed rate, and fuel utilization were determined experimentally on the AGR–SOFC performance (i.e., output power, stack temperature, and gas composition) using a variable flow ejector and a recirculation ratio of 0.55–0.62, overall fuel utilization of 0.720–84, and steam feed rate of 0–1.5 g/min. A quadrupole mass spectrometer was used to identify the recirculation ratio, the gas composition of reformed gas at the AGR–SOFC inlet, and that of the recycle gas at the outlet. Compared to one-path SOFC systems, i.e., without an AGR, the AGR–SOFC was stable and generated about 15 W more electricity when the overall fuel utilization was 0.84 and the recirculation ratio was 0.622 with no steam supply. This improved performance was due to the reduced H2O concentration in the anodic gas. In addition, although the recirculation ratio did not affect the AGR–SOFC performance, a high recirculation ratio can provide steam produced via the electrochemical reaction to the injected fuel for the steam reforming process.

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References

Figures

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Fig. 1

1 kW SOFC power generation system with AGR

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Fig. 2

Ejector configuration for AGR in 1 kW SOFC power generation

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Fig. 3

Performance of AGR system at constant fuel feed rate and overall fuel utilization

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Fig. 4

Output power W at various recirculation ratio r

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Fig. 5

Stack temperature profile for a one-path system and a recycle system with no steam supply (MH2O = 0 g/min)

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Fig. 6

Recirculation ratio r for various ejector needle position x

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Fig. 7

Stack temperature profile for various recirculation ratio r

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Fig. 8

Gas composition at the recycle plenum for various recirculation ratio r

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Fig. 9

Recirculation ratio r versus in-flow rate of externally supplied steam MH2O

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Fig. 10

Recirculation ratio r versus differential pressure between the fuel plenum and the recycle plenum ΔP2

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Fig. 11

Stack temperature profile for various in-flow rate of externally supplied steam MH2O

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Fig. 12

Gas composition at the recycle plenum for various in-flow rate of externally supplied steam MH2O

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Fig. 13

Recirculation ratio r versus overall fuel utilization uf,o

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Fig. 14

Stack temperature profile for various overall fuel utilization uf,o

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Fig. 15

Gas composition at the recycle plenum versus overall fuel utilization uf,o

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