Abstract-Experimental study on spontaneous combustion of grain dust was carried out in a cylindrical combustion chamber with vertical flow. Thermocouples and gas sample analyzer were used to measure the temperature and gas of spontaneous combustion respectively. The influence of ventilation volume, bulk density and percentage of dust of sample on the spontaneous combustion propagation velocity was investigated. The results indicated that the self-propagation spontaneous combustion is more likely to happen at relatively low ventilation volume. At early stage, the characteristic gas of spontaneous combustion are CO2 and CO. Spontaneous combustion velocity is proportional to ventilation volume while in inverse proportion to bulk density. The spontaneous combustion could transform into flaming easily under certain ventilation volume.

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