Experimental study on the influence of ignition delay time on the explosion characteristics of dusty gas

Abstract

Listen

Translate article

ABSTRACT To conduct a systematic investigation into the impact of varying ignition delay times on the explosion characteristics of dusty gases, a 60-L cylindrical combustion chamber was employed to simulate the chamber environment. Mixed explosion experiments were conducted with coal dust at concentrations of 0 g/m3 and 10 g/m3, respectively, at ignition delay times of 30 ms, 60 ms, 90 ms, 120 ms, 180 ms, 240 ms, and 300 ms. Following the introduction of ignition delay, a decrease of 6.77% was observed in the maximum explosion pressure (Pmax), while the maximum pressure rise rate (dP/dt)max demonstrated an increase of 6.78%. In a dusty gas explosion, the changing trend of Pmax and (dP/dt)max under a 10 g/m3 coal dust concentration generally exhibits an initial increase followed by a subsequent decrease with the gradual increase of ignition delay. With the dilute coal dust involved in the explosion reaction, Sn is in a stable state. These findings offer a valuable contribution to the field of dusty gas explosion, which provides insights that can be used to prevent and manage coal mine catastrophes.