Abstract: Abstract: In order to study suppression effect of 4A zeolite on dust explosion of wheat starch, based on the optimum mass concentration of wheat starch, experiments of mixed dust explosion of wheat starch/4A zeolite were conducted by using closed Siwek 20-L sphere, and the variation law of pmax and (dp/dt)max of mixed dust with the increase of the mass of 4A zeolite was analyzed. The experimental results show that 4A zeolite can reduce the explosion intensity of wheat starch and inhibit the propagation of explosion flame.In 10 g of wheat starch, the addition of 4A zeolite can continuously reduce (dp/dt)max of wheat starch, and when its mass fraction is over 9.09%, it can greatly reduce pmax of wheat starch and mixed dust cannot explode. 4A zeolite can weaken dust explosion of wheat starch, and inhibit the propagation of explosion flame through physical and chemical suppression effect, including heat absorption, dilution and free radical adsorption.

Key words: Key words: dust explosion, wheat starch, 4A zeolite, inert powder, suppression effect