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An experimental study of spontaneous ignition in storages of wood pellets

Blomqvist, Per LU ; Persson, Henry; Van Hees, Patrick LU ; Holmstedt, Göran LU ; Göransson, Ulf LU ; Wadsö, Lars LU ; Sanati, Mehri LU and Rupar-Gadd, Katarina (2007) In 10th International Conference - Fire and Materials 2007
Abstract
This article focuses on experimental studies of self-heating characteristics of wood pellets. Controlled experiments have been conducted in physical scales from 1 dm3 to 4 m3 with wood pellets. Basket tests have been conducted according to the "crossing-point method" to derive kinetic data on the exothermic reactions responsible for self-heating and eventually spontaneous ignition. The kinetic data was used in the planning of the large-scale experiments for predictions of approximate critical temperatures. The experiments in the 1 m3 scale were set-up basically as an enlargement of the basket tests to obtain validation experiments with controlled boundary conditions in a reasonable large scale. Several experiments were conducted and... (More)
This article focuses on experimental studies of self-heating characteristics of wood pellets. Controlled experiments have been conducted in physical scales from 1 dm3 to 4 m3 with wood pellets. Basket tests have been conducted according to the "crossing-point method" to derive kinetic data on the exothermic reactions responsible for self-heating and eventually spontaneous ignition. The kinetic data was used in the planning of the large-scale experiments for predictions of approximate critical temperatures. The experiments in the 1 m3 scale were set-up basically as an enlargement of the basket tests to obtain validation experiments with controlled boundary conditions in a reasonable large scale. Several experiments were conducted and spontaneous ignition was seen in the centre of the pellet bulk at an ambient temperature of 115C. The close to real-scale experiments with 4 m3 wood pellets filled in a 6 m high silo were not strictly self heating experiments, instead a core shaped heating element was allowed to initiate the pyrolysis in the pellets. Heat and gas production and transportation from the growing pyrolysis zone were mapped with a large number of measurement points in the pellets bulk and in the top of the silo. The experimental work conducted gave kinetic data on the exothermic reactions in wood pellets, insight in self heating processes, a link between different experimental scales and knowledge regarding possibilities for detection of fires in storages of wood pellets. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Pelletizing, Biofuels, Exothermic reactions, Experiments, Heating, Kinetics, Silos (agricultural), Spontaneous combustion, Temperature, Wood
in
10th International Conference - Fire and Materials 2007
publisher
Interscience Communications
external identifiers
  • Scopus:84873589202
language
English
LU publication?
yes
id
cf0241a4-3ab8-4c39-90a2-2fb8c6d73f4c (old id 4468366)
date added to LUP
2014-06-19 09:43:55
date last changed
2017-01-01 08:06:12
@inproceedings{cf0241a4-3ab8-4c39-90a2-2fb8c6d73f4c,
  abstract     = {This article focuses on experimental studies of self-heating characteristics of wood pellets. Controlled experiments have been conducted in physical scales from 1 dm3 to 4 m3 with wood pellets. Basket tests have been conducted according to the "crossing-point method" to derive kinetic data on the exothermic reactions responsible for self-heating and eventually spontaneous ignition. The kinetic data was used in the planning of the large-scale experiments for predictions of approximate critical temperatures. The experiments in the 1 m3 scale were set-up basically as an enlargement of the basket tests to obtain validation experiments with controlled boundary conditions in a reasonable large scale. Several experiments were conducted and spontaneous ignition was seen in the centre of the pellet bulk at an ambient temperature of 115C. The close to real-scale experiments with 4 m3 wood pellets filled in a 6 m high silo were not strictly self heating experiments, instead a core shaped heating element was allowed to initiate the pyrolysis in the pellets. Heat and gas production and transportation from the growing pyrolysis zone were mapped with a large number of measurement points in the pellets bulk and in the top of the silo. The experimental work conducted gave kinetic data on the exothermic reactions in wood pellets, insight in self heating processes, a link between different experimental scales and knowledge regarding possibilities for detection of fires in storages of wood pellets.},
  author       = {Blomqvist, Per and Persson, Henry and Van Hees, Patrick and Holmstedt, Göran and Göransson, Ulf and Wadsö, Lars and Sanati, Mehri and Rupar-Gadd, Katarina},
  booktitle    = {10th International Conference - Fire and Materials 2007},
  keyword      = {Pelletizing,Biofuels,Exothermic reactions,Experiments,Heating,Kinetics,Silos (agricultural),Spontaneous combustion,Temperature,Wood},
  language     = {eng},
  publisher    = {Interscience Communications},
  title        = {An experimental study of spontaneous ignition in storages of wood pellets},
  year         = {2007},
}