Behaviour of smoldering fires during periodic refilling of wood pellets into silos

The evolution of smoldering fires in biomass stored lab-scale silos with additional fuel material supplied repeatedly, has been studied. direct effects the added on sample are: cooling, enhanced thermal insulation, and facilitation more intense combustion at a later stage. This article focuses which leads to an almost instantaneous reduction rate. Surprisingly, this does not vary only amount refilled – but also depends strongly stage process. demonstrates that underlying processes merely certain degree are regularized by periodic refillings. Quantitatively, functional relationship between change rate caused refilling was determined. results displays four regimes, reflect different stages process time refilling. Using Arrhenius equation, we find for one these regimes expression ratio rates (immediately after immediately before refill) as function material. contains free (undetermined) parameter. We determine value parameter from data demonstrate is consistent simple model how sudden cooling occurs spatially sample.