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Research Papers

Off-Design Analysis of a MCFC-Gas Turbine Hybrid Plant

[+] Author and Article Information
P. Iora1

Dipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia, Brescia 25123, Italypaolo.iora@ing.unibs.it

S. Campanari

Dipartimento di Energia, Politecnico di Milano, Milano 20156, Italy

A. Salogni

Dipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia, Brescia 25123, Italy

The calculation time is essentially influenced by the necessity to run separately the FC finite volume model, which requires about 100 s on an average PC for each iteration, and by the convergence of the ASPEN model.

1

Corresponding author.

J. Fuel Cell Sci. Technol 7(3), 031022 (Mar 17, 2010) (8 pages) doi:10.1115/1.4000679 History: Received April 07, 2009; Revised September 30, 2009; Published March 17, 2010; Online March 17, 2010

The paper presents a model for the off-design analysis of a hybrid plant based on a MCFC and a gas-turbine. The model is used to define a possible regulation strategy for the power plant, minimizing the performance decay at partial load and allowing investigation of the interaction issues among the different plant components. The hybrid plant reflects at nominal conditions the expected performances for the 500 kW-class MCFC plant proposed by Ansaldo Fuel Cells. The simulation is carried out respecting the matching of the gas-turbine and the part-load behavior of the fuel cell and the heat exchangers. The gas-turbine is modeled through compressor and turbine performance maps, and the FC is modeled through a finite volume code. The results indicate the possibility to regulate effectively the plant power output acting on the turbine shaft speed, the air-to-fuel ratio, the bypass of cathode air, and the fuel utilization, achieving very high part-load efficiency and respecting constraints on the admitted operating range for the plant components.

FIGURES IN THIS ARTICLE
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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Layout diagram of the hybrid MCFC–GT power plant

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Figure 2

Representation of the characteristic curves of the compressor

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Figure 3

Representation of the characteristic curves of the turbine

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Figure 4

Representation of the HRSG component in Fig. 1

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Figure 5

Representation of the results obtained by simulating the optimized part-load regulation strategy in the power range 75–100%

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Figure 6

Representation of the results obtained by simulating the optimized part-load regulation strategy in the power range 25–100%

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