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Research Papers

Performance Enhancement of a Molten Carbonate Fuel Cell/Micro Gas Turbine Hybrid System With Carbon Capture by Off-Gas Recirculation

[+] 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

Ji Hun Jeong

Graduate School,
Inha University,
100 Inha-ro, Nam-gu,
Incheon 22212, South Korea
e-mail: jihun7236@naver.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.

Manuscript received June 21, 2018; final manuscript received July 6, 2018; published online December 19, 2018. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 141(4), 041036 (Dec 19, 2018) (10 pages) Paper No: GTP-18-1274; doi: 10.1115/1.4040866 History: Received June 21, 2018; Revised July 06, 2018

The demand for clean energy continues to increase as the human society becomes more aware of environmental challenges such as global warming. Various power systems based on high-temperature fuel cells have been proposed, especially hybrid systems combining a fuel cell with a gas turbine (GT), and research on carbon capture and storage (CCS) technology to prevent the emission of greenhouse gases is already underway. This study suggests a new method to innovatively enhance the efficiency of a molten carbonate fuel cell (MCFC)/micro GT hybrid system including carbon capture. The key technology adopted to improve the net cycle efficiency is off-gas recirculation. The hybrid system incorporating oxy-combustion capture was devised, and its performance was compared with that of a post-combustion system based on a hybrid system. A MCFC system based on a commercial unit was modeled. Externally supplied water for reforming was not needed as a result of the presence of the water vapor in the recirculated anode off-gas. The analyses confirmed that the thermal efficiencies of all the systems (MCFC stand-alone, hybrid, hybrid with oxy-combustion capture, hybrid with post-combustion capture) were significantly improved by introducing the off-gas recirculation. In particular, the largest efficiency improvement was observed for the oxy-combustion hybrid system. Its efficiency is over 57% and is even higher than that of the post-combustion hybrid system.

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Figures

Grahic Jump Location
Fig. 1

Configuration of a normal MCFC system

Grahic Jump Location
Fig. 2

Configuration of a recirculated MCFC system

Grahic Jump Location
Fig. 3

Configuration of the recirculated hybrid and post-hybrid (dotted) system with bottoming cycle

Grahic Jump Location
Fig. 4

Configuration of a CCS process

Grahic Jump Location
Fig. 5

Configuration of a CSU

Grahic Jump Location
Fig. 6

Configuration of an oxy-hybrid with bottoming cycle

Grahic Jump Location
Fig. 7

Variation in the efficiency of the recirculated MCFC system as a function of AR and CR

Grahic Jump Location
Fig. 8

Variation in the performance of the recirculated MCFC system with AR based on CR of 0.802

Grahic Jump Location
Fig. 9

Variation in the performance of the recirculated MCFC system with combustion gas recirculation ratio based on AR of 0.74

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