Abstract: For the sake of exploring the explosion suppression effect of explosion suppression powder content on explosion of cornstarch/air mixtures,experiments in suppression of cornstarch/air mixtures explosion by superfine sodium bicarbonate powder were conducted by using a self-developed explosion suppression device with 3 m³ confined space.The influences of the consumption of explosion powder,the trigger time,and the layout manner of explosion suppression device on explosion pressure were observed.The results show that increasing the consumption of explosion powder,shortening the trigger time,and increasing the number of explosion suppression devices can effectively reduce the explosion peak pressure and delay the time to the peak of the explosion pressure,and enhance the suppression effect on the dust explosion in the confined space,and that increasing the number of explosion suppression devices can avoid the occurrence of the re-ignition and a secondary explosion during the explosion suppression.

Key words: superfine powder, cornstarch, explosion, confined space, suppression