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Application of Ejector in Solid Oxide Fuel Cell Anode Circulation System

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Abstract

As a new generation fuel cell, solid oxide fuel cell (SOFC) has become a hot spot in the industry due to its unique advantages. In order to improve energy utilization and prevent carbon deposition in the reformer, the ejector is usually used to recover the cell anode exhaust. In this paper, the applications related to ejector in SOFC are reviewed, including the ejector design and optimization methods, the ejector performance verification experiment and the performance of ejector in SOFC systems. Besides, in order to adapt to the wide power output characteristics of the stack, a study on extending the working range of the ejector is also introduced. On the one hand, the theory of optimal design of ejector used in SOFC system is obtained, including the influence of main structure parameters of ejector on the performance of the whole system and the theoretical model of performance monitoring of ejector used in SOFC. On the other hand, it is proved that the ejector used in SOFC power system can prevent the occurrence of carbon deposition problems, while the recovery of exhaust heat can improve the energy utilization of the system. Finally, suggestions for future related research work are given, aiming to promote the ejector-based SOFC system to provide higher and more stable performance in the future.

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Abbreviations

D :

diameter/m

L :

length/m

m :

mass flow rate/kg·s−1

P :

pressure/Pa

T :

temperature/K

c:

back pressure

cb:

backflow pressure

cr:

critical back pressure

P:

primary flow

S:

secondary flow

1:

nozzle throat

2:

mixing chamber

3:

diffuser

α :

nozzle diverging angle/(°)

α D :

diameter ratio

β :

diffuser diverging angle/(°)

η :

efficiency

ω :

entrainment ratio

AGR:

anode gas recycle

AOG:

anode of gas

FC:

fuel cell

NXP:

nozzle exit position

PR:

pressure lift ratio

STCR:

steam to carbon ratio

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant No. 51776110).

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  1. School of Energy and Power Engineering, Shandong University, Ji’nan, 250061, China

    Dongdong Li, Hongxia Zhao, Fanchen Kong & Guanmin Zhang

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  1. Dongdong Li
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Li, D., Zhao, H., Kong, F. et al. Application of Ejector in Solid Oxide Fuel Cell Anode Circulation System. J. Therm. Sci. 31, 634–649 (2022). https://doi.org/10.1007/s11630-022-1587-8

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  • DOI: https://doi.org/10.1007/s11630-022-1587-8

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