Abstract: The experimental study on the spontaneous combustion characteristics of typical lignite and wood powder under the condition of stacking was carried out by using the standard stack dust natural temperature measuring device.This paper analyzes the characteristics of temperature and time changes of combustible dust accumulation and spontaneous combustion under natural ventilation, and defines the criteria basis and measurement method of accumulation and spontaneous combustion.The experimental results show that the spontaneous combustion temperature of large volume of dust can be predicted based on the measurement of the volume of accumulated dust: the larger the volume of accumulated dust is, the lower the spontaneous combustion temperature is; at the same temperature, the larger the volume of accumulated dust is, the more unstable the accumulated dust is. This study can provide experimental data support for the prevention and control of spontaneous combustion fire and accident investigation of accumulated dust.

Key words: accumulated dust, spontaneous combustion temperature, volume of accumulated dust, characteristics of spontaneous combustion