Pulverized straw combustion in a low-NOx multifuel burner: Modeling the transition from coal to straw

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38 Citations (Scopus)

Abstract

A CFD simulation of pulverized coal and straw combustion using a commercial multifuel burner have been undertaken to examine the difference in combustion characteristics. Focus has also been directed to development of the modeling technique to deal with larger non-spherical straw particles and to determine the relative importance of different modeling choices for straw combustion. Investigated modeling choices encompass the particle size and shape distribution, the modification of particle motion and heating due to the departure from the spherical ideal, the devolatilization rate of straw, the influence of inlet boundary conditions and the effect of particles on the carrier phase turbulence. It is concluded that straw combustion is associated with a significantly longer flame and smaller recirculation zones compared to coal combustion for the present air flow specifications. The particle size and shape distribution is the most influential parameter for the correct prediction of straw combustion. The inlet boundary conditions and the application of a turbulence modulation model can significantly affect the predicted combustion efficiency whereas the choice of devolatilization parameters was found to be of minor importance.
Original languageEnglish
JournalFuel
Volume89
Issue number10
Pages (from-to)3051-3062
Number of pages11
ISSN0016-2361
DOIs
Publication statusPublished - Oct 2010

Fingerprint

Coal
Straw
Fuel burners
Turbulence
Particle size
Boundary conditions
Coal combustion
Computational fluid dynamics
Modulation
Specifications
Heating
Air

Keywords

  • Pulverized straw combustion
  • Gas-particle flow
  • Low-NOx burner
  • CFD
  • Biomass

Cite this

@article{d6c12484dc314c6fbedd37ce74846dfd,
title = "Pulverized straw combustion in a low-NOx multifuel burner: Modeling the transition from coal to straw",
abstract = "A CFD simulation of pulverized coal and straw combustion using a commercial multifuel burner have been undertaken to examine the difference in combustion characteristics. Focus has also been directed to development of the modeling technique to deal with larger non-spherical straw particles and to determine the relative importance of different modeling choices for straw combustion. Investigated modeling choices encompass the particle size and shape distribution, the modification of particle motion and heating due to the departure from the spherical ideal, the devolatilization rate of straw, the influence of inlet boundary conditions and the effect of particles on the carrier phase turbulence. It is concluded that straw combustion is associated with a significantly longer flame and smaller recirculation zones compared to coal combustion for the present air flow specifications. The particle size and shape distribution is the most influential parameter for the correct prediction of straw combustion. The inlet boundary conditions and the application of a turbulence modulation model can significantly affect the predicted combustion efficiency whereas the choice of devolatilization parameters was found to be of minor importance.",
keywords = "Pulverized straw combustion, Gas-particle flow, Low-NOx burner, CFD, Biomass",
author = "Matthias Mand{\o} and Lasse Rosendahl and Chungen Yin and Henrik S{\o}rensen",
year = "2010",
month = "10",
doi = "10.1016/j.fuel.2010.05.016",
language = "English",
volume = "89",
pages = "3051--3062",
journal = "Fuel",
issn = "0016-2361",
publisher = "Pergamon Press",
number = "10",

}

Pulverized straw combustion in a low-NOx multifuel burner : Modeling the transition from coal to straw. / Mandø, Matthias; Rosendahl, Lasse; Yin, Chungen; Sørensen, Henrik.

In: Fuel , Vol. 89, No. 10, 10.2010, p. 3051-3062 .

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Pulverized straw combustion in a low-NOx multifuel burner

T2 - Modeling the transition from coal to straw

AU - Mandø, Matthias

AU - Rosendahl, Lasse

AU - Yin, Chungen

AU - Sørensen, Henrik

PY - 2010/10

Y1 - 2010/10

N2 - A CFD simulation of pulverized coal and straw combustion using a commercial multifuel burner have been undertaken to examine the difference in combustion characteristics. Focus has also been directed to development of the modeling technique to deal with larger non-spherical straw particles and to determine the relative importance of different modeling choices for straw combustion. Investigated modeling choices encompass the particle size and shape distribution, the modification of particle motion and heating due to the departure from the spherical ideal, the devolatilization rate of straw, the influence of inlet boundary conditions and the effect of particles on the carrier phase turbulence. It is concluded that straw combustion is associated with a significantly longer flame and smaller recirculation zones compared to coal combustion for the present air flow specifications. The particle size and shape distribution is the most influential parameter for the correct prediction of straw combustion. The inlet boundary conditions and the application of a turbulence modulation model can significantly affect the predicted combustion efficiency whereas the choice of devolatilization parameters was found to be of minor importance.

AB - A CFD simulation of pulverized coal and straw combustion using a commercial multifuel burner have been undertaken to examine the difference in combustion characteristics. Focus has also been directed to development of the modeling technique to deal with larger non-spherical straw particles and to determine the relative importance of different modeling choices for straw combustion. Investigated modeling choices encompass the particle size and shape distribution, the modification of particle motion and heating due to the departure from the spherical ideal, the devolatilization rate of straw, the influence of inlet boundary conditions and the effect of particles on the carrier phase turbulence. It is concluded that straw combustion is associated with a significantly longer flame and smaller recirculation zones compared to coal combustion for the present air flow specifications. The particle size and shape distribution is the most influential parameter for the correct prediction of straw combustion. The inlet boundary conditions and the application of a turbulence modulation model can significantly affect the predicted combustion efficiency whereas the choice of devolatilization parameters was found to be of minor importance.

KW - Pulverized straw combustion

KW - Gas-particle flow

KW - Low-NOx burner

KW - CFD

KW - Biomass

U2 - 10.1016/j.fuel.2010.05.016

DO - 10.1016/j.fuel.2010.05.016

M3 - Journal article

VL - 89

SP - 3051

EP - 3062

JO - Fuel

JF - Fuel

SN - 0016-2361

IS - 10

ER -