Abstract
A novel superfine dry powder extinguishing agent (DW-SDE) was developed by combining dawsonite (NaAl(OH)2CO3, DW) with superfine ABC dry powder fire extinguishing agent (SDE). The micro-morphology of DW transforms into a near-spherical shape (D90 = 8.33 μm) under optimal conditions including a mass ratio of 1:10 for citric acid (ZS) to aluminum hydroxide, a reaction time of 8 h, and a reaction temperature of 150 °C. The D90 of DW-SDE is 11.20 μm which is less than that of SDE (D90 = 14.46 μm). The activation energy (E) of DW-SDE is lower (E = 102.0 kJ/mol) and the thermal decomposition of DW-SDE can absorb more heat (388.7 J/mg). Moreover, the flowability of DW-SDE is superior to that of SDE and commercial ABC dry powder extinguishing agent (CDE). Furthermore, the DW-SDE can completely extinguish a fire in 8.7 s at 0.6 MPa, which is 47.4% and 27.1% faster than that of CDE and SDE.
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