An experimental study of spontaneous ignition in storages of wood pellets

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

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.

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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Building Technologies
  • Atom and Molecular Physics and Optics
  • Materials Engineering

Keywords

  • Pelletizing, Biofuels, Exothermic reactions, Experiments, Heating, Kinetics, Silos (agricultural), Spontaneous combustion, Temperature, Wood
Original languageEnglish
Title of host publication10th International Conference - Fire and Materials 2007
PublisherInterscience Communications
Publication statusPublished - 2007
Publication categoryResearch
Peer-reviewedNo