ABSTRACT
Lignite is the main raw material in the coal chemical process. Lignite dust produced in the coal chemical process is dangerous for combustion and explosion. Therefore, the combustion and explosion characteristics of lignite dust were studied in this paper. The combustion characteristics of lignite dust were studied by TG analysis, and the effects of different heating rates on the combustion characteristics of lignite dust were analyzed. The effects of different mass concentrations and different ignition energies on the maximum explosion pressure of lignite dust were studied by using a 20 L ball explosive device. The results show that when the heating rate is 10°C/min, the dust mass-loss rate is the largest and the combustion rate is faster when the temperature is 512°C. As the heating rate increases, the maximum weight loss rate of lignite dust increases. The temperature required to achieve the maximum weight loss rate increases from 490°C to 566°C. The maximum explosive pressure of lignite dust is 150 g/m3. Under the action of high ignition energy of pulverized coal, the danger of explosion will increase, and the accident consequences of the explosion will be more serious. When the dust concentration is 150 g/m3, the explosion pressure is the highest, which is 0.7658 MPa. When the concentration is 300 g/m3, the ignition energy has a more significant effect on the explosive pressure of lignite dust.
