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CFD based reactivity parameter determination for biomass particles of multiple size ranges in high heating rate devolatilization

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CFD based reactivity parameter determination for biomass particles of multiple size ranges in high heating rate devolatilization. / Niemelä, Niko P.; Tolvanen, Henrik; Saarinen, Teemu; Leppänen, Aino; Joronen, Tero.

julkaisussa: Energy, Vuosikerta 128, 01.06.2017, s. 676-687.

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@article{abdd454bac3c4d6793fd24272dc7bf80,
title = "CFD based reactivity parameter determination for biomass particles of multiple size ranges in high heating rate devolatilization",
abstract = "This work presents a methodology that combines experimental measurements and Computational Fluid Dynamics (CFD) modeling to determine the global reaction kinetics of high heating rate biomass devolatilization. Three particle size ranges of woody biomass are analyzed: small (SF), medium (MF) and large (LF) fractions. Devolatilization mass loss is measured for each fraction in a laminar Drop-Tube Reactor (DTR) in nitrogen atmosphere, using two nominal reactor temperatures of 873 and 1173 K. Single First Order Reaction (SFOR) kinetics are determined by coupling an optimization routine with CFD models of the DTR. The global pre-exponential factors and activation energies for the SF, MF and LF particles are 5880 1/s and 42.7 kJ/mol, 48.1 1/s and 20.2 kJ/mol, and 102 1/s and 24.8 kJ/mol, respectively. These parameters are optimized for the isothermal heat transfer model available in CFD programs, and it is recommended that the specific heat capacity that was used in the optimization (1500 J/kgK) is used together with the parameters. Using the SF kinetics for small wood particles and either of the MF or LF kinetics for large particles, it is expected that more accurate devolatilization predictions can be obtained for the whole fuel size distribution in large scale CFD simulations.",
keywords = "Biomass, Computational Fluid Dynamics (CFD), Devolatilization, High heating rate, Pyrolysis, Single First Order Reaction (SFOR)",
author = "Niemel{\"a}, {Niko P.} and Henrik Tolvanen and Teemu Saarinen and Aino Lepp{\"a}nen and Tero Joronen",
year = "2017",
month = "6",
day = "1",
doi = "10.1016/j.energy.2017.04.023",
language = "English",
volume = "128",
pages = "676--687",
journal = "Energy",
issn = "0360-5442",
publisher = "Elsevier",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - CFD based reactivity parameter determination for biomass particles of multiple size ranges in high heating rate devolatilization

AU - Niemelä, Niko P.

AU - Tolvanen, Henrik

AU - Saarinen, Teemu

AU - Leppänen, Aino

AU - Joronen, Tero

PY - 2017/6/1

Y1 - 2017/6/1

N2 - This work presents a methodology that combines experimental measurements and Computational Fluid Dynamics (CFD) modeling to determine the global reaction kinetics of high heating rate biomass devolatilization. Three particle size ranges of woody biomass are analyzed: small (SF), medium (MF) and large (LF) fractions. Devolatilization mass loss is measured for each fraction in a laminar Drop-Tube Reactor (DTR) in nitrogen atmosphere, using two nominal reactor temperatures of 873 and 1173 K. Single First Order Reaction (SFOR) kinetics are determined by coupling an optimization routine with CFD models of the DTR. The global pre-exponential factors and activation energies for the SF, MF and LF particles are 5880 1/s and 42.7 kJ/mol, 48.1 1/s and 20.2 kJ/mol, and 102 1/s and 24.8 kJ/mol, respectively. These parameters are optimized for the isothermal heat transfer model available in CFD programs, and it is recommended that the specific heat capacity that was used in the optimization (1500 J/kgK) is used together with the parameters. Using the SF kinetics for small wood particles and either of the MF or LF kinetics for large particles, it is expected that more accurate devolatilization predictions can be obtained for the whole fuel size distribution in large scale CFD simulations.

AB - This work presents a methodology that combines experimental measurements and Computational Fluid Dynamics (CFD) modeling to determine the global reaction kinetics of high heating rate biomass devolatilization. Three particle size ranges of woody biomass are analyzed: small (SF), medium (MF) and large (LF) fractions. Devolatilization mass loss is measured for each fraction in a laminar Drop-Tube Reactor (DTR) in nitrogen atmosphere, using two nominal reactor temperatures of 873 and 1173 K. Single First Order Reaction (SFOR) kinetics are determined by coupling an optimization routine with CFD models of the DTR. The global pre-exponential factors and activation energies for the SF, MF and LF particles are 5880 1/s and 42.7 kJ/mol, 48.1 1/s and 20.2 kJ/mol, and 102 1/s and 24.8 kJ/mol, respectively. These parameters are optimized for the isothermal heat transfer model available in CFD programs, and it is recommended that the specific heat capacity that was used in the optimization (1500 J/kgK) is used together with the parameters. Using the SF kinetics for small wood particles and either of the MF or LF kinetics for large particles, it is expected that more accurate devolatilization predictions can be obtained for the whole fuel size distribution in large scale CFD simulations.

KW - Biomass

KW - Computational Fluid Dynamics (CFD)

KW - Devolatilization

KW - High heating rate

KW - Pyrolysis

KW - Single First Order Reaction (SFOR)

U2 - 10.1016/j.energy.2017.04.023

DO - 10.1016/j.energy.2017.04.023

M3 - Article

VL - 128

SP - 676

EP - 687

JO - Energy

JF - Energy

SN - 0360-5442

ER -