Validation of a FBC model for co-firing of hazelnut shell with lignite against experimental data

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Experimental Thermal and Fluid Science

DOI:https://doi.org/10.1016/J.EXPTHERMFLUSCI.2009.12.006· OSTI ID:21305725

Kulah, Gorkem ^[1]

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1. Middle East Technical University, Department of Chemical Engineering, 06531 Ankara (Turkey)

Performance of a comprehensive system model extended for modelling of co-firing of lignite and biomass was assessed by applying it to METU 0.3 MW{sub t} Atmospheric Bubbling Fluidized Bed Combustor co-firing lignite with hazelnut shell and validating its predictions against on-line temperature and concentration measurements of O{sub 2}, CO{sub 2}, CO, SO{sub 2} and NO along the same test rig fired with lignite only, lignite with limestone addition and lignite with biomass and limestone addition. The system model accounts for hydrodynamics; volatiles release and combustion, char combustion, particle size distribution for lignite and biomass; entrainment; elutriation; sulfur retention and NO formation and reduction, and is based on conservation equations for energy and chemical species. Special attention was paid to different devolatilization characteristics of lignite and biomass. A volatiles release model based on a particle movement model and a devolatilization kinetic model were incorporated into the system model separately for both fuels. Kinetic parameters for devolatilization were determined via thermogravimetric analysis. Predicted and measured temperatures and concentrations of gaseous species along the combustor were found to be in good agreement. Introduction of biomass to lignite was found to decrease SO{sub 2} emissions but did not affect NO emissions significantly. The system model proposed in this study proves to be a useful tool in qualitatively and quantitatively simulating the processes taking place in a bubbling fluidized bed combustor burning lignite with biomass. (author)

• OSTI ID: 21305725
• Journal Information: Experimental Thermal and Fluid Science, Vol. 34, Issue 5; Other Information: Elsevier Ltd. All rights reserved; ISSN 0894-1777
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
01 COAL, LIGNITE, AND PEAT
LIGNITE
SULFUR DIOXIDE
FLUIDIZED-BED COMBUSTION
NITRIC OXIDE
BIOMASS
CARBON DIOXIDE
EXPERIMENTAL DATA
LIMESTONE
CARBON MONOXIDE
VALIDATION
DEVOLATILIZATION
HYDRODYNAMICS
SULFUR
PARTICLE SIZE
CHARS
ELUTRIATION
EMISSION
REDUCTION
VOLATILITY
DISTRIBUTION
ENTRAINMENT
NUTS
PERFORMANCE
RETENTION
SIMULATION
OXYGEN
VOLATILE MATTER
Co-firing