Influence of Dispersion Pressure and Ignition Delay Time on the Dust Explosion Parameters

Dust explosion experiments were carried out in a 5 L closed cylindrical vessel using cornstarch dispersed with compressed air and ignited by high-voltage spark, for further study of the factors which affect the dust explosion parameters.With different dispersion pressure, the influence of ignition delay time on the pressure parameters of dust explosion was studied, and the experimental results were analyzed theoretically.The results show that the influence of ignition delay time on explosion pressure and rise rate of pressure is significant, a critical value of dispersion pressure is found.When dispersion pressure is higher than the critical pressure, there is an optimum ignition delay time, making the explosion pressure and pressure rise rate maximal.With the increasing of dispersion pressure, the optimum ignition delay time decreases.When dispersion pressure is lower than the critical pressure, the pressure of dust explosion rises as the ignition delay time increases.