Experimental study on the explosion-propagation law of coal dust with different moisture contents induced by methane explosion
2020
Niu, Yihui | Zhang, Leilin | Shi, Biming
This study aimed to explore the explosion-propagation law of coal dust with different moisture contents induced by methane explosion. An experimental system of explosion of mixed gas–coal and dust in a straight pipe was established in our laboratory. The evolution of overpressure and the flame-propagation law of deposited-coal-dust explosion with different moisture contents were then studied. Experimental results indicate that when the moisture content is less than 15.12%, the deposited coal dust in the pipeline explodes under the induction of gas explosion. Meanwhile, the total amount of deposited coal dust in the pipeline remains constant; the overpressure peak value and flame-propagation velocity after coal-dust explosion initially increase and then decrease with increased coal-dust moisture content. When the moisture content of the deposited coal dust is 9.57%, the overpressure and flame-propagation velocity of the depositional coal-dust explosion reach the maximum values of 0.766 MPa and 468.553 m/s, respectively. However, when the moisture content exceeds 20.28%, coal dust cannot induce an explosion, and the deposited coal dust can resist a gas explosion. Overall, this research provides theoretical references for methane-induced coal-dust-explosion resistance in coal mines.
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