Study on the inhibition effect and mechanism of N2 twin-fluid water mist with modified chloride compounds on LPG explosion

In order to develop environmontal friendly and high efficient LPG explosion inhibitors, experiments were carried out to investigate the impact of AeO9 (fatty alcohol polyoxyethylene ether) and Sicare2235 (silicone surfactant) surfactants on the suppression effect of N2 twin-fluid water mist containing modified chloride compounds on 6 % LPG/air explosion. Results showed that: The addition of a single surfactant can significantly reduce the surface tension of the droplets and improve the explosion suppression efficiency of N2 twin-fluid water mist containing chloride additives. However, chloride additives have selectivity towards surfactants. There are obvious differences in the synergistic inhibition effect of different chlorides and surfactants. Under the combination of 0.6 % AeO9, 0.06 % Sicare2235 surfactants and chloride additives, the increase in surface tension will weaken the physical explosion suppression effect and lead to the phenomenon of explosion enhancement. The results of chemical kinetics simulations indicate that, in comparison to a single explosion suppressant, the chlorine-containing compound N2 twin-fluid water mist effectively lowers the adiabatic flame temperature and the concentration of key free radicals H, OH and O. The reaction CH3 + H + M = CH3OH + M plays a pivotal role in reducing the adiabatic flame temperature during LPG explosion.