Predicting Spontaneous Ignition and Combustion in Fixed Beds of Activated Carbon

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Abstract
A mathematical model is presented which gives good agreement with experimental results for the spontaneous ignition and combustion of a bed of activated carbon granules through which heated air is passed. The model simulates the temporal development of temperature and gas species concentration profiles along the axis of the bed. Previously reported empirical relationships between the spontaneous ignition temperature (SIT) and air velocity and between the position of first ignition and air velocity are reproduced. The paper includes discussion of: the major uncertainties in the model input data, including the concentration of active sites on the carbon; an empirically-derived expression for the effect of air vitiation at low flow rates; and the concept of the first ignition zone. The use of the model for predicting the risk of spontaneous ignition in gas filters of certain nuclear power plant is also considered

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