Abstract
Smouldering fires in storage equipment are often caused by glowing nests or embedded hot bodies. Due to large temperature gradients near the glowing nest in a deposit of bulk material the detection of a smouldering fire is difficult and the smouldering fire may remain unnoticed until the reaction front breaks through the surface of the deposit. The present paper reports experimental investigations on thermal conditions, which may cause or promote an ongoing smouldering process, e.g. critical initial temperatures of embedded hot bodies or critical initial sizes of glowing nests. Propagation velocities of smouldering fires were dependent on the sample size, the oxygen content within the sample and on the caloric properties of three combustible dusts.
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