Determination of the Self-ignition Behaviour of Bulk Materials from Heat Storage Tests below Atmospheric Pressure

Abstract

Is a displacement of the self-ignition temperature up to higher temperatures possible by a pressure reduction? Therefore, the influence of an air pressure reduction on the self-ignition temperature of dust bulks is investigated. First, major effects which might influence the self-ignition temperature and the combustion behaviour of dust bulks under reduced pressure are described. Based on these theoretical considerations, basic experiments are carried out to determine the self-ignition temperature under reduced pressure. Thereby, the determination of the self-ignition temperature is carried out by isoperibolic heat storage tests according to DIN EN 15188:2007. The results of the investigations show that self-ignition temperatures of different bulk materials shift to higher temperatures within a pressure reduction.