Abstract: The study aims to investigate effective safety techniques for controlling dust explosions in large interconnected containers using ABC dry powder as the explosion suppression medium. The experiments were conducted in a 5 m3 industrial container, filled with corn starch-air mixture, under explosion venting conditions. The researchers used a self-developed explosion suppression device to explore the variation of peak explosion pressure and flame propagation velocity during a dust explosion and to assess the effectiveness of the device in suppressing the explosion under the specified conditions. The findings revealed that the maximum explosion pressure inside the container under venting conditions was 19.59 kPa. Moreover, the peak pressure gradually decreased from the container to the end of the connected pipeline, while the flame propagation velocity increased with increasing distance. Chemical explosion suppression is a complex process that involves interactions between explosion pressure waves and flames and high-pressure nitrogen-explosion suppression agent mist, which includes the collision of gas flows, inertization, and heat absorption and release. Thus, the use of explosion suppression devices necessitates that sufficient suppression distance be reserved to address these complexities.

Key words: starch explosion, explosion venting, explosion suppression device, connected container, chemical explosion suppression