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Research Papers

Evaluation of Cathode Air Flow Transients in a SOFC/GT Hybrid System Using Hardware in the Loop Simulation

[+] Author and Article Information
Nana Zhou

College of Power Engineering,
Chongqing University,
No. 174 Shazhengjie, Shapingba,
Chongqing 400044, China
e-mail: zhounana.cqu@gmail.com

Chen Yang

College of Power Engineering,
Chongqing University,
No. 174 Shazhengjie, Shapingba,
Chongqing 400044, China
e-mail: yxtyc@cqu.edu.cn

David Tucker

U.S. Department of Energy,
National Energy Technology Laboratory,
3610 Collins Ferry Road,
Morgantown, WV 26507
e-mail: David.Tucker@netl.doe.gov

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received May 29, 2014; final manuscript received August 4, 2014; published online November 25, 2014. Editor: Nigel M. Sammes.

This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Approved for public release; distribution is unlimited.

J. Fuel Cell Sci. Technol 12(1), 011003 (Feb 01, 2015) (7 pages) Paper No: FC-14-1068; doi: 10.1115/1.4028950 History: Received May 29, 2014; Revised August 04, 2014; Online November 25, 2014

Thermal management in the fuel cell component of a direct fired solid oxide fuel cell gas turbine (SOFC/GT) hybrid power system can be improved by effective management and control of the cathode airflow. The disturbances of the cathode airflow were accomplished by diverting air around the fuel cell system through the manipulation of a hot-air bypass valve in open loop experiments, using a hardware-based simulation facility designed and built by the U.S. Department of Energy, National Energy Technology Laboratory (NETL). The dynamic responses of the fuel cell component and hardware component of the hybrid system were studied in this paper.

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References

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Figures

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Fig. 1

Hybrid performance facility at NETL

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Fig. 2

Cathode inlet air mass flow (FE-380) transient as a function of time

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Fig. 3

Transient of cathode inlet conditions and turbine speed

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Fig. 4

(a) Transients of system cathode inlet air flow (FE-380), fuel flow (FX-432) and turbine speed (ST-502): long term scale and (b) transients of system cathode inlet air flow (FE-380), fuel flow (FX-432) and turbine speed (ST-502): short time scale

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Fig. 5

(a) Gas temperature in 20 nodes in the cathode during cathode inlet airflow decrease: 3D figure and (b) gas temperature in 20 nodes in the cathode during cathode inlet airflow decrease: 2D figure

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Fig. 6

Transient of the temperature difference between solid and gas

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Fig. 7

(a) Solid temperature in 20 nodes in the cathode during cathode inlet airflow decrease: 3D figure and (b) solid temperature in 20 nodes in the cathode during cathode inlet airflow decrease: 2D figure

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Fig. 8

Solid temperature transients in 20 nodes in the cathode during cathode inlet airflow decrease when the heat capacity scale was set as 0.001

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Fig. 9

The rate of the solid temperature difference in selected node

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Fig. 10

The temperature gradient of the solid in several selected nodes

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Fig. 11

(a) Transient of current density as a function of time: 3D figure and (b) transient of current density as a function of time: 2D figure

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Fig. 12

Transient of current density as a function of nodes

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Fig. 13

Current density transients in 20 nodes during cathode inlet airflow decrease when the heat capacity scale was set as 0.001

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Fig. 14

(a) Transient of Nernst as a function of time: 3D figure and (b) transient of Nernst as a function of time: 2D figure

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Fig. 15

(a) Losses as a function of time: activation loss, (b) losses as a function of time: ohmic loss, (c) losses as a function of time: diffusion loss, and (d) losses as a function of time: normalized value

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Fig. 16

Stack power, voltage, and fuel utilization as a function of time

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