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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Performance Evaluation of a Molten Carbonate Fuel Cell/Micro Gas Turbine Hybrid System With Oxy-Combustion Carbon Capture

[+] Author and Article Information
Ji Ho Ahn

Graduate School,
Inha University,
100 Inha-ro,
Nam-gu, Incheon 22212, South Korea
e-mail: Jiho1ahn@gmail.com

Tong Seop Kim

Department of Mechanical Engineering,
Inha University,
100 Inha-ro,
Nam-gu, Incheon 22212, South Korea
e-mail: kts@inha.ac.kr

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 9, 2017; final manuscript received August 6, 2017; published online October 31, 2017. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(4), 041502 (Oct 31, 2017) (11 pages) Paper No: GTP-17-1324; doi: 10.1115/1.4038038 History: Received July 09, 2017; Revised August 06, 2017

Owing to the increasing consumption of fossil fuels and emission of greenhouse gases, interests in highly efficient and low carbon emitting power systems are growing fast. Several research groups have been suggesting advanced systems based on fuel cells and have also been applying carbon capture and storage technology to satisfy the demand for clean energy. In this study, the performance of a hybrid system, which is a combination of a molten carbonate fuel cell (MCFC) with oxy-combustion carbon capture and an indirectly fired micro gas turbine (MGT), was predicted. A 2.5 MW MCFC system that is used in commercial applications was used as the reference system so that the results of the study could be applied to practical situations. The ambient pressure type hybrid system was modeled by referring to the design parameters of an MGT that is currently being developed. A semi-closed type design characterized by flow recirculation was adopted for this hybrid system. A part of the recirculating gas is converted into liquefied carbon dioxide and captured for storage at the carbon separation unit (CSU). Almost 100% carbon dioxide capture is possible with this system. In these systems, the output power of the fuel cell is larger than in the normal hybrid system without carbon capture because the partial pressure of carbon dioxide increases. The increased cell power partially compensates for the power loss due to the carbon capture and MGT power reduction. The dependence of net system efficiency of the oxy-hybrid on compressor pressure ratio is marginal, especially beyond an optimal value.

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Figures

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Fig. 1

Configuration of the MCFC system

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Fig. 2

Configuration of the atmospheric pressure hybrid system

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Fig. 3

Configuration of the MCFC system adopting oxy-combustion technology (oxy-MCFC)

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Fig. 4

Configuration of the atmospheric pressure hybrid system adopting oxy-combustion technology (oxy-hybrid)

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Fig. 5

Configuration of the CSU

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Fig. 6

Variation performance parameters of the oxy-hybrid with compressor pressure ratio

Grahic Jump Location
Fig. 7

Variation in net system efficiency with compressor pressure ratio

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