Abstract: A near spherical coal dust explosion experimental device was used to test and analyze the change law of explosion pressure characteristics with micron lignite dust as the research object. The research shows that the maximum pressure of micron lignite dust explosion is 0.73 MPa, and the maximum pressure rise rate is 65.78 MPa/s. The explosion intensity can cause great harm to people near the explosion source. The mass fraction of volatile matter involved in the explosion reached 26.25%, indicating that volatile matter is the main component involved in the explosion of lignite dust. When the dust injection pressure is between 1.4 MPa and 2.6 MPa, the maximum explosion pressure and the maximum pressure rise rate first increase and then decrease. When the dust injection pressure is 1.8~2.2 MPa, the maximum explosion pressure is relatively large, indicating that the lignite dust diffuses most fully in the area near the ignition head under this condition. As the increase of the ignition delay time from 70 ms to 130 ms, the maximum explosion pressure and the maximum pressure rise rate both increase first and then decrease, and the optimal ignition delay time is about 100 ms, indicating that under this condition, lignite dust particles reach the best dispersion state, so that the explosion intensity can be maximized.

Key words: lignite dust, explosion pressure, maximum pressure, rise rate of maximum pressure