J. Phys. IV France 12 (2002) Pr7-71
Self-ignition of dusts at reduced volume fractions of oxygenU. Krause and M. Schmidt
Federal Institute for Materials Research and Testing (BAM), Laboratory II.22 "Dust Fires and Dust Explosions", Unter den Eichen 87, 12205 Berlin, Germany
Experimental results are presented on self-ignition of five different dusts under the condition of reduced volume fractions of oxygen. Therefore, a laboratory oven as used for hot storage testing was modified to allow flushing with controllable mixtures of nitrogen and oxygen. The reduction of oxygen led to a moderate increase in the self-ignition temperatures for all the dusts tested and for different volumes of the dust samples. Furthermore, at reduced oxygen level an increase in the induction periods and a decrease in the peak temperatures of the combustion were observed. However, it was impossible to avoid self-ignition, even at oxygen volume fractions as low as 3 to 6%.
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