Part-load, startup, and shutdown strategies of a solid oxide fuel cell-gas turbine hybrid system
Part-load, startup, and shutdown strategies of a solid oxide fuel cell-gas turbine hybrid system
Yang LI, Yiwu WENG(), Shilie WENG
School of Mechanical Engineering, Key Laboratory for Power Machinery and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
Current work on the performance of a solid oxide fuel cell (SOFC) and gas turbine hybrid system is presented. Each component model developed and applied is mathematically defined. The electrochemical performance of single SOFC with different fuels is tested. Experimental results are used to validate the SOFC mathematical model. Based on the simulation model, a safe operation regime of the hybrid system is accurately plotted first. Three different part-load strategies are introduced and used to analyze the part-load performance of the hybrid system using the safe regime. Another major objective of this paper is to introduce a suitable startup and shutdown strategy for the hybrid system. The sequences for the startup and shutdown are proposed in detail, and the system responses are acquired with the simulation model. Hydrogen is used instead of methane during the startup and shutdown process. Thus, the supply of externally generated steam is not needed for the reforming reaction. The gas turbine is driven by complementary fuel and supplies compressed air to heat up or cool down the SOFC stack operating temperature. The dynamic simulation results show that smooth cooling and heating of the cell stack can be accomplished without external electrical power.
Park S K, Kim T S. Comparison between pressurized design and ambient pressure design of hybrid solid oxide fuel cell–gas turbine systems. Journal of Power Sources , 2006, 163(1): 490–499 doi: 10.1016/j.jpowsour.2006.09.036
3
Palsson J, Selimovic A, Sjunnesson L. Combined solid oxide fuel cell and gas turbine systems for efficient power and heat generation. Journal Power source , 2000, 86(1,2): 442–448
4
Laxmidhar Besra, Charles Compson, Meilin Liu. Electrophoretic deposition on non-conducting substrates: the case of YSZ film on NiO–YSZ composite substrates for solid oxide fuel cell application. Journal Power Souce , 2007, 173(1): 130–136
5
Aguiar P, Adjiman C S, Brandon N P. Anode-supported intermediate temperature direct internal reforming solid oxide fuel cell. I: model-based steady-state performance. Journal of Power Sources , 2004, 138(1, 2): 120–136 doi: 10.1016/j.jpowsour.2004.06.040
6
Campanari S, Iora P. Definition and sensitivity analysis of a finite volume SOFC model for a tubular cell geometry. Journal of Power Sources , 2004, 132(1,2): 113–126 doi: 10.1016/j.jpowsour.2004.01.043
7
Augiar P, Adjiman C S, Brandon N P. Anode-supported intermediate temperature direct internal reforming solid oxide fuel cell. I: model-based steady-state performance. Journal of Power Sources , 2004, 138(1,2): 120–136 doi: 10.1016/j.jpowsour.2004.06.040
8
Achenbach E. Three-dimensional and time-dependent simulation of a planar solid oxide fuel cell stack. Journal of Power Sources , 1994, 49(1-3): 338–348 doi: 10.1016/0378-7753(93)01833-4
9
Kays W M, London A L. Compact Heat Exchanger. 3rd ed. New York: McGraw Hill Book Company, Inc, 1998
10
Palsson J, Selimovic A, Sjunnesson L. Combined solid oxide fuel cell and gas turbine systems for efficient power and heat generation. Journal of Power Sources , 2000, 86(1-2): 442–448 doi: 10.1016/S0378-7753(99)00464-4
12
Chan S H, Low C F, Ding O L. Energy and exergy analysis of simple solid-oxide fuel-cell power systems. Journal of Power Sources , 2002, 103(2): 188–200 doi: 10.1016/S0378-7753(01)00842-4
13
Stiller C, Thorud B, Bolland O, Kandepu R, Imsland L. Control strategy for a solid oxide fuel cell and gas turbine hybrid system. Journal of Power Sources , 2006, 158(1): 303–315 doi: 10.1016/j.jpowsour.2005.09.010
14
Liu A, Weng Y. Performance analysis of a pressurized molten carbonate fuel cell/micro-gas turbine hybrid system. Journal of Power Sources , 2010, 195(1): 204–213 doi: 10.1016/j.jpowsour.2009.07.024
15
Calise F, Dentice d’Accadia M, Vanoli L, von Spakovsky M R. Single-level optimization of a hybrid SOFC–GT power plant. Journal of Power Sources , 2006, 159(2): 1106–1185 doi: 10.1016/j.jpowsour.2005.11.108
16
Kandepu R, Imsland L, Foss B A, Stiller C, Thorud B, Bolland O. Modeling and control of a SOFC-GT-based autonomous power system. Energy , 2007, 32(4): 406–417 doi: 10.1016/j.energy.2006.07.034