Experimental Research on Effect of Different Inert Powders on the Minimum Ignition Energy and Suppression Effect of Sucrose Dust

Abstract

In order to prevent sucrose dust explosion, the suppression effect of four inert dusts (such as NH4H2PO4, Al (OH)3, NaCl and NaHCO3) on the minimum ignition energy (MIE) of sucrose dust was studied by 1.2L Hartmann apparatus. The experimental results shown that the fire sensitivity of sucrose dust can be reduced by adding inert powders, and the MIE of sucrose dust significantly could be increased. The higher the mass fraction of inert powders and smaller particle size, the better the suppression effect. The best suppression effect on the sucrose dust flame propagation was NaHCO3. The mass fraction of NaHCO3, Al(OH)3, NH4H2PO4, NaCl (38-47μm) reaching 20%, 60%, 35% and 40% respectively, the sucrose dust were completely inerted. The mass fraction of four inert powders which particle size was 25-37μm were reached 20%, 60%, 30% and 35% respectively, the sucrose dust were completely inerted. Therefore, the suppression effect of four inert powders on sucrose cloud of dust combustion flame was: NaHCO3 > NH4H2PO4> NaCl > Al (OH)3.