Thermodynamic Analyses of Biomass Gasification Integrated Externally Fired, Post-Firing and Dual-Fuel Combined Cycles

Saeed Soltani, Hassan Athari, Marc A. Rosen, Seyed Mohammad Seyed Mahmoudi and Tatiana Morosuk
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Saeed Soltani: Faculty of Mechanical Engineering, University of Tabriz, Tabriz 51664, Iran
Hassan Athari: Department of Mechanical Engineering, University of Ataturk, Erzurum 25240, Turkey
Marc A. Rosen: Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, ON L1H 7K4, Canada
Seyed Mohammad Seyed Mahmoudi: Faculty of Mechanical Engineering, University of Tabriz, Tabriz 51664, Iran
Tatiana Morosuk: Institute for Energy Engineering, Technische Universität Berlin, Marchstr 18, Berlin 10587, Germany

Sustainability, 2015, vol. 7, issue 2, 1-15

Abstract: In the present work, the results are reported of the energy and exergy analyses of three biomass-related processes for electricity generation: the biomass gasification integrated externally fired combined cycle, the biomass gasification integrated dual-fuel combined cycle, and the biomass gasification integrated post-firing combined cycle. The energy efficiency for the biomass gasification integrated post-firing combined cycle is 3% to 6% points higher than for the other cycles. Although the efficiency of the externally fired biomass combined cycle is the lowest, it has an advantage in that it only uses biomass. The energy and exergy efficiencies are maximized for the three configurations at particular values of compressor pressure ratios, and increase with gas turbine inlet temperature. As pressure ratio increases, the mass of air per mass of steam decreases for the biomass gasification integrated post-firing combined cycle, but the pressure ratio has little influence on the ratio of mass of air per mass of steam for the other cycles. The gas turbine exergy efficiency is the highest for the three configurations. The combustion chamber for the dual-fuel cycle exhibits the highest exergy efficiency and that for the post-firing cycle the lowest. Another benefit of the biomass gasification integrated externally fired combined cycle is that it exhibits the highest air preheater and heat recovery steam generator exergy efficiencies.

Keywords: energy; exergy; gasification; combined cycle; biomass (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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