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Period for Spontaneous Ignition of a Refuse Derived Fuel Pile

  • Lijing Gao
  • Toshisuke Hirano

Abstract

This paper presents the results of attempt to predict the period available for prevention of spontaneous ignition in a RDF (refuse derived fuel) pile. The heat transfer in a RDF pile was discussed for a case when the effect of convection is negligible. By analyzing the energy equation, it was inferred that the temperature in a large pile of RDF hardly becomes uniform. Assuming that the term representing the effect of the temperature rise on the thermal balance becomes appreciable compared to that representing the effect of the conductive heat transfer just before ignition, the period for the temperature rise to ignition was inferred. By comparing the period predicted by analysis to that observed at a fire, the size of the higher temperature region in the pile was inferred to be smaller than 3 m. Then, the available period from the detection of the temperature rise to the ignition of RDF piles of various sizes were predicted on the basis of the Frank-Kamenetskii theory. It is indicated that the available period drastically decreases with the increase of detection temperature. Also, the available period increases with the increase of the RDF size.

Keywords

Spontaneous ignition ignition process refuse derived fuel large pile fire 

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Lijing Gao
    • 1
  • Toshisuke Hirano
  1. 1.Faculty of Risk and Crisis ManagementChiba Institute of Science3 Shiomi-cho, Choshi-shiJapan

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