Investigation on the explosion suppression characteristics and mechanism of fluorine and phosphorus composite modified dry water on AlH3

The low-temperature hydrogen evolution and high explosion strength of AlH 3 pose significant fire and explosion risks for its industrial application. However, research on the explosion suppression performance and mechanism of AlH 3 is limited. KH 2 PO 4 and surfactant FS-50 are proven to effectively suppress Al and H 2 explosions, respectively. Herein, fluorine-phosphorus composite modified dry water (FPDW) is prepared by compounding KH 2 PO 4 and FS-50 using high-speed shear. F/P ratios has a significant suppression effect on AlH 3 explosion. As a concentration of 200 g/m 3 FPDW with a F/P ratio of 1:15 is added, the v avg of AlH 3 decreases to 1.03 m/s, p max drops to 0.47 MPa, and (d p /d t ) max reduces to 5.26 MPa/s. The critical suppression concentration of FPDW for AlH 3 is determined to be 300 g/m 3 . The results of reaction kinetics simulations confirm that F/P-containing radicals generated by the decomposition of FPDW will have a targeted trapping effect on AlH 3 flame radicals.