Thermodynamic Performance Study of Biomass Gasification, Solid Oxide Fuel Cell and Micro Gas Turbine Hybrid Systems

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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@article{8f8268d0d987488dbcf7b17123c8c8b1,
title = "Thermodynamic Performance Study of Biomass Gasification, Solid Oxide Fuel Cell and Micro Gas Turbine Hybrid Systems",
keywords = "Electrochemical model, Solid oxide fuel cells, Micro gas turbine, Biomass gasification, Combined heat and power, System design",
publisher = "Pergamon",
author = "Christian Bang-Møller and Masoud Rokni",
year = "2010",
doi = "10.1016/j.enconman.2010.04.006",
volume = "51",
pages = "2330--2339",
journal = "Energy Conversion and Management",
issn = "0196-8904",

}

RIS

TY - JOUR

T1 - Thermodynamic Performance Study of Biomass Gasification, Solid Oxide Fuel Cell and Micro Gas Turbine Hybrid Systems

A1 - Bang-Møller,Christian

A1 - Rokni,Masoud

AU - Bang-Møller,Christian

AU - Rokni,Masoud

PB - Pergamon

PY - 2010

Y1 - 2010

N2 - A system level modelling study of three combined heat and power systems based on biomass gasification is presented. Product gas is converted in a micro gas turbine (MGT) in the first system, in a solid oxide fuel cell (SOFC) in the second system and in a combined SOFC–MGT arrangement in the third system. An electrochemical model of the SOFC has been developed and calibrated against published data from Topsoe Fuel Cells A/S and the Risø National Laboratory. The modelled gasifier is based on an up scaled version (~500 kW_th) of the demonstrated low tar gasifier, Viking, situated at the Technical University of Denmark. The SOFC converts the syngas more efficiently than the MGT, which is reflected by the energetic electrical efficiency of the gasifier and MGT system in opposition to the gasifier and SOFC configuration – η_el = 28.1% versus η_el = 36.4%. By combining the SOFC and MGT, the unconverted syngas from the SOFC is utilised in the MGT to produce more power and the SOFC is pressurised, which improves the efficiency to as much as η_el = 50.3%. Variation of the different operating conditions reveals an optimum for the chosen pressure ratio with respect to the resulting electrical efficiency. Furthermore, the SOFC operating temperature should be kept high and the cathode temperature gradient maximised.

AB - A system level modelling study of three combined heat and power systems based on biomass gasification is presented. Product gas is converted in a micro gas turbine (MGT) in the first system, in a solid oxide fuel cell (SOFC) in the second system and in a combined SOFC–MGT arrangement in the third system. An electrochemical model of the SOFC has been developed and calibrated against published data from Topsoe Fuel Cells A/S and the Risø National Laboratory. The modelled gasifier is based on an up scaled version (~500 kW_th) of the demonstrated low tar gasifier, Viking, situated at the Technical University of Denmark. The SOFC converts the syngas more efficiently than the MGT, which is reflected by the energetic electrical efficiency of the gasifier and MGT system in opposition to the gasifier and SOFC configuration – η_el = 28.1% versus η_el = 36.4%. By combining the SOFC and MGT, the unconverted syngas from the SOFC is utilised in the MGT to produce more power and the SOFC is pressurised, which improves the efficiency to as much as η_el = 50.3%. Variation of the different operating conditions reveals an optimum for the chosen pressure ratio with respect to the resulting electrical efficiency. Furthermore, the SOFC operating temperature should be kept high and the cathode temperature gradient maximised.

KW - Electrochemical model

KW - Solid oxide fuel cells

KW - Micro gas turbine

KW - Biomass gasification

KW - Combined heat and power

KW - System design

U2 - 10.1016/j.enconman.2010.04.006

DO - 10.1016/j.enconman.2010.04.006

JO - Energy Conversion and Management

JF - Energy Conversion and Management

SN - 0196-8904

VL - 51

SP - 2330

EP - 2339

ER -