Simultaneous drying and pyrolysis of solid fuel particles

Jaakko Saastamoinen (Corresponding Author), Jean-Robert Richard

Research output: Contribution to journalArticleScientificpeer-review

79 Citations (Scopus)

Abstract

Drying and devolatilization are studied at combustion temperatures. The surface temperature of particles at the end of drying can significantly exceed the temperature when devolatilization starts, implying that drying and pyrolysis may partly overlap. Devolatilization is controlled by heat transfer, when the particle size is large. The critical particle size at which heat transfer dominates chemical kinetics is discussed. A model for calculating the intrinsic rate of generation of volatiles in the regime of heat transfer control is presented. A novel isotherm migration method is used for the computation of simultaneous drying and pyrolysis inside a fuel particle. It applies to the study of heat transfer in a one-dimensional geometry with moving phase-change boundaries, internal fluid flow and mass generation, including steep temperature and density profiles, as frequently encountered in combustion.
Original languageEnglish
Pages (from-to)288-300
Number of pages13
JournalCombustion and Flame
Volume106
Issue number3
DOIs
Publication statusPublished - 1996
MoE publication typeA1 Journal article-refereed

Fingerprint

drying
pyrolysis
Drying
Pyrolysis
heat transfer
Heat transfer
Particle size
combustion temperature
Temperature
Reaction kinetics
temperature profiles
surface temperature
fluid flow
Isotherms
Flow of fluids
isotherms
reaction kinetics
Geometry
profiles
geometry

Keywords

  • fuels
  • particles
  • drying
  • pyrolysis
  • heat transfer
  • combustion
  • vaporization

Cite this

Saastamoinen, Jaakko ; Richard, Jean-Robert. / Simultaneous drying and pyrolysis of solid fuel particles. In: Combustion and Flame. 1996 ; Vol. 106, No. 3. pp. 288-300.
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abstract = "Drying and devolatilization are studied at combustion temperatures. The surface temperature of particles at the end of drying can significantly exceed the temperature when devolatilization starts, implying that drying and pyrolysis may partly overlap. Devolatilization is controlled by heat transfer, when the particle size is large. The critical particle size at which heat transfer dominates chemical kinetics is discussed. A model for calculating the intrinsic rate of generation of volatiles in the regime of heat transfer control is presented. A novel isotherm migration method is used for the computation of simultaneous drying and pyrolysis inside a fuel particle. It applies to the study of heat transfer in a one-dimensional geometry with moving phase-change boundaries, internal fluid flow and mass generation, including steep temperature and density profiles, as frequently encountered in combustion.",
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Simultaneous drying and pyrolysis of solid fuel particles. / Saastamoinen, Jaakko (Corresponding Author); Richard, Jean-Robert.

In: Combustion and Flame, Vol. 106, No. 3, 1996, p. 288-300.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Simultaneous drying and pyrolysis of solid fuel particles

AU - Saastamoinen, Jaakko

AU - Richard, Jean-Robert

N1 - Project code: ENE4330

PY - 1996

Y1 - 1996

N2 - Drying and devolatilization are studied at combustion temperatures. The surface temperature of particles at the end of drying can significantly exceed the temperature when devolatilization starts, implying that drying and pyrolysis may partly overlap. Devolatilization is controlled by heat transfer, when the particle size is large. The critical particle size at which heat transfer dominates chemical kinetics is discussed. A model for calculating the intrinsic rate of generation of volatiles in the regime of heat transfer control is presented. A novel isotherm migration method is used for the computation of simultaneous drying and pyrolysis inside a fuel particle. It applies to the study of heat transfer in a one-dimensional geometry with moving phase-change boundaries, internal fluid flow and mass generation, including steep temperature and density profiles, as frequently encountered in combustion.

AB - Drying and devolatilization are studied at combustion temperatures. The surface temperature of particles at the end of drying can significantly exceed the temperature when devolatilization starts, implying that drying and pyrolysis may partly overlap. Devolatilization is controlled by heat transfer, when the particle size is large. The critical particle size at which heat transfer dominates chemical kinetics is discussed. A model for calculating the intrinsic rate of generation of volatiles in the regime of heat transfer control is presented. A novel isotherm migration method is used for the computation of simultaneous drying and pyrolysis inside a fuel particle. It applies to the study of heat transfer in a one-dimensional geometry with moving phase-change boundaries, internal fluid flow and mass generation, including steep temperature and density profiles, as frequently encountered in combustion.

KW - fuels

KW - particles

KW - drying

KW - pyrolysis

KW - heat transfer

KW - combustion

KW - vaporization

U2 - 10.1016/0010-2180(96)00001-6

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