Ignition wave propagation and release of volatiles in beds of wood particles

Jaakko Saastamoinen (Corresponding Author), M. Horttanainen, P. Sarkomaa

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

Ignition wave propagation against the air flow is studied in different packed beds of wood fuels both experimentally and theoretically. Observed trends can be predicted with the model when moisture, bed density and air rate vary. The geometrical factors, such as particle shape, size and orientation are lumped to a single experimental parameter for heat transport in the bed.

The main factors affecting the ignition velocity are fuel moisture content, fuel volatile content, air flow rate through the bed, air temperature, bulk density of the fuel bed, particle size, and particle shape. The ignited mass flow rate of dry solids per unit area of the bed (velocity of the ignition front x bed density( is an important parameter, when designing combustion equipment, since it is proportional to the release rate of the volatiles from the grate area and the energy/grate area obtained from the combustion of volatiles. Different factors (fuel, moisture, particle size, bed porosity) affecting the ignited mass flux and release of volatiles are discussed.
Original languageEnglish
Pages (from-to)41-60
Number of pages20
JournalCombustion Science and Technology
Volume165
Issue number1
DOIs
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

Fingerprint

Wave propagation
ignition
Ignition
beds
wave propagation
Wood
Moisture
Air
Combustion equipment
Particle size
Flow rate
Wood fuels
Packed beds
air flow
moisture
Mass transfer
Porosity
mass flow rate
air
moisture content

Keywords

  • wood
  • wood fuels
  • particles
  • combustion
  • ignition

Cite this

Saastamoinen, Jaakko ; Horttanainen, M. ; Sarkomaa, P. / Ignition wave propagation and release of volatiles in beds of wood particles. In: Combustion Science and Technology. 2001 ; Vol. 165, No. 1. pp. 41-60.
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Ignition wave propagation and release of volatiles in beds of wood particles. / Saastamoinen, Jaakko (Corresponding Author); Horttanainen, M.; Sarkomaa, P.

In: Combustion Science and Technology, Vol. 165, No. 1, 2001, p. 41-60.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Ignition wave propagation and release of volatiles in beds of wood particles

AU - Saastamoinen, Jaakko

AU - Horttanainen, M.

AU - Sarkomaa, P.

PY - 2001

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N2 - Ignition wave propagation against the air flow is studied in different packed beds of wood fuels both experimentally and theoretically. Observed trends can be predicted with the model when moisture, bed density and air rate vary. The geometrical factors, such as particle shape, size and orientation are lumped to a single experimental parameter for heat transport in the bed.The main factors affecting the ignition velocity are fuel moisture content, fuel volatile content, air flow rate through the bed, air temperature, bulk density of the fuel bed, particle size, and particle shape. The ignited mass flow rate of dry solids per unit area of the bed (velocity of the ignition front x bed density( is an important parameter, when designing combustion equipment, since it is proportional to the release rate of the volatiles from the grate area and the energy/grate area obtained from the combustion of volatiles. Different factors (fuel, moisture, particle size, bed porosity) affecting the ignited mass flux and release of volatiles are discussed.

AB - Ignition wave propagation against the air flow is studied in different packed beds of wood fuels both experimentally and theoretically. Observed trends can be predicted with the model when moisture, bed density and air rate vary. The geometrical factors, such as particle shape, size and orientation are lumped to a single experimental parameter for heat transport in the bed.The main factors affecting the ignition velocity are fuel moisture content, fuel volatile content, air flow rate through the bed, air temperature, bulk density of the fuel bed, particle size, and particle shape. The ignited mass flow rate of dry solids per unit area of the bed (velocity of the ignition front x bed density( is an important parameter, when designing combustion equipment, since it is proportional to the release rate of the volatiles from the grate area and the energy/grate area obtained from the combustion of volatiles. Different factors (fuel, moisture, particle size, bed porosity) affecting the ignited mass flux and release of volatiles are discussed.

KW - wood

KW - wood fuels

KW - particles

KW - combustion

KW - ignition

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JO - Combustion Science and Technology

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