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Research Papers

Performance Evaluation of an SOFC-GT Hybrid System With Ejectors for the Anode and Cathode Recirculations

[+] Author and Article Information
Jinwei Chen

Gas Turbine Research Institute,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: chenjinweituihou@sjtu.edu.cn

Kuanying Gao

Gas Turbine Research Institute,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: 2289074882@qq.com

Maozong Liang

Gas Turbine Research Institute,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: maomessi@126.com

Huisheng Zhang

Gas Turbine Research Institute,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: zhslm@sjtu.edu.cn

1Corresponding authors.

Manuscript received March 5, 2018; final manuscript received February 12, 2019; published online March 25, 2019. Editor: Wilson K. S. Chiu.

J. Electrochem. En. Conv. Stor. 16(4), 041004 (Mar 25, 2019) (11 pages) Paper No: JEECS-18-1021; doi: 10.1115/1.4042985 History: Received March 05, 2018; Accepted February 20, 2019

The ejectors used for the fuel cell recirculation are more reliable and low cost in maintenance than high-temperature blowers. In this paper, an anode and cathode recirculation scheme, equipped with ejectors, was designed in a solid oxide fuel cell-gas turbine (SOFC-GT) hybrid system. The ejector model, SOFC model, and other component models and the validation were conducted to investigate the performance of the hybrid system with anode and cathode ejectors. The geometric parameters of the ejectors were designed to perform the anode and cathode recirculation loops according to the design conditions of the hybrid system with a blower-based recirculation loop. The cathode ejector geometries are much larger than the anode ejector. In addition, the sensitivity analysis of the primary fluid for the standalone anode and cathode ejectors is investigated. The results show that the ejector can recirculate more secondary fluid by reducing the ejector outlet pressure. Then, the anode and cathode ejectors were integrated into the SOFC-GT hybrid system. A blower gets involved downstream, and the compressor is necessary to avoid high expensive cost of redesigning compressor. The off-design and dynamic performance were characterized after integrating the anode and cathode ejectors into the hybrid system. The dynamic and off-design performances show that the designed ejectors are effectively integrated into the anode and cathode recirculation loops to replace the blower-based recirculation loops. The safety range of relative fuel flow rate is 0.62–1.22 in the fixed rotational speed strategy, and it is 0.53–1.1 in the variable rotational speed strategy. The variable rotational speed strategy can ensure higher system efficiency, which is more than 61% at a part-load condition.

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Figures

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Fig. 1

The schematic of the SOFC-GT hybrid system

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Fig. 2

The schematic diagram of a single-stage ejector

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Fig. 3

Ejector outlet's pressure increase with varying primary fluid mass flow rates

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Fig. 4

Ejector outlet's temperature with varying primary fluid mass flow rates

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Fig. 5

Rotational speed and cathode inlet temperature with varying fuel flow rates

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Fig. 6

STCR and recirculated flow rate with varying fuel flow rates

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Fig. 7

Outlet temperature and maximum temperature gradient of the cathode channel with varying fuel flow rates

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Fig. 8

Outlet temperature and maximum temperature gradient of the anode channel with varying fuel flow rates

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Fig. 9

Average current density and SOFC operating voltage with varying fuel flow rates

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Fig. 10

TIT with varying fuel flow rates

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Fig. 11

Compressor flow rate and surge margin with varying fuel flow rates

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Fig. 12

SOFC and GT output power with varying fuel flow rates

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Fig. 13

System efficiency with varying fuel flow rates

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Fig. 14

Dynamic responses of the primary fluid mass flow rate

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Fig. 15

Dynamic responses of the secondary fluid mass flow rate

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Fig. 16

Dynamic responses of the ejector outlet temperature

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Fig. 17

Dynamic responses of the ejector outlet pressure

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Fig. 18

Dynamic responses of the anode ejector STCR

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Fig. 19

Dynamic responses of πc and TIT

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