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research-article

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, Republic of Korea
Jiho1ahn@gmail.com

Tong Seop Kim

Dept. of Mechanical Engineering, Inha University 100 Inha-ro, Nam-gu, Incheon, 22212, Republic of Korea
kts@inha.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4038038 History: Received July 09, 2017; Revised August 06, 2017

Abstract

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 2.5MW MCFC system for commercial applications was used as the reference system so that the results of the study could be applicable to practical situations. The ambient pressure type hybrid system was modeled by referring to the design parameters of an MGT under development. 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. Almost 100% carbon dioxide capture is possible. 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.

Copyright (c) 2017 by ASME
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