Abstract
A model calculation of spontaneous ignition in an autoxidative powder
bed has shown that the critical state can be classified into Frank-Kamenetskii
and oxygen-deficient types. The first type includes an irreversible
transient process to ignition at the critical point and its thermal
stability is rather frail against the changes in ambient conditions.
In the second type, the oxygen diffusion suffocatingly controls the
rate of heat generation in the bed and the thermal stability is comparatively
robust. The types can be largely discriminated by the material and
the porosity of the bed.
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