Explosion mitigation of methane‐air mixture in combined application of inert gas and ABC dry powders in a closed compartment

Abstract

The explosion is one of the most serious safety incidents occurring in the application of the gas methane in industrial process. The new developments in attenuating the destruction and environmental hazard of this explosion are conducted using the combined inert gas and ABC dry powder. The explosive characteristic parameters including flame configuration, velocity of flame propagation, explosion pressure, and pressure rising rate are quantified and revealed. The difference of explosion mitigation effect of ordinary and ultra‐fine ABC dry powders are examined based upon the specific surface area and the settling velocity. As the concentration of ordinary or ultra‐fine ABC dry powder increases, the explosion pressure initially increases and decreases afterwards, indicating that there is an optimal mass concentration of explosion mitigation for both powders. The effect of ignition delay time on the explosion mitigation of ultra‐fine ABC dry powder is characterized on the basis of the turbulent lever and the dry powder particle settling state. Moreover, the mechanisms of explosion mitigation with CO2 and the ultra‐fine ABC dry powder are fully revealed both on the physical and chemical properties. The present research provides basic data and theoretical guidance for prevention and controlling of gas explosion accidents.

Studying the Effects of Wave Dissipation Structure and Multiple Size Diffusion Chambers on Explosion Shock Wave Propagation

“…Via a vertical combustion tube, Zhao et al [10] examined the deflagration of methane, coal dust, and ABC dry powder. Through experimentation, Li et al [11] analyzed the CO 2 and ultrafine ABC dry powder explosion suppression method. Through experimental quantification, Song et al [12] investigated the impact of sedimentary rock powder volume on explosion overpressure, temperature, and flame velocity.…”

Explosion mitigation of methane–air mixture in combined application of HFC‐227ea/CO2 and ultrafine water mist in the pipeline

“…Powders, inorganic salts, and fluorinated alkanes are other common chemical antiknocks. Scholars frequently undertake methane explosion suppression studies with a mixture of several chemicals in order to increase the efficacy of explosion suppression 9 . Ingram et al 10 investigated the use of nitrogen and an ultrafine water mist to control hydrogen explosions in a synergistic manner.…”

“…Scholars frequently undertake methane explosion suppression studies with a mixture of several chemicals in order to increase the efficacy of explosion suppression. 9 Ingram et al 10 investigated the use of nitrogen and an ultrafine water mist to control hydrogen explosions in a synergistic manner. Their findings revealed that nitrogen and ultrafine water mist might have a substantial impact on the pace of flame propagation and pressure of a hydrogen explosion.…”

Experimental Study on Two-Phase Explosion Suppression of Gas/Pulverized Coal by Explosion Suppressant

“…The results showed that an inhibitor composed of NaHCO 3 (BC) powder/inert gas had better inhibition performance in comparison to an inhibitor composed of NH 4 H 2 PO 4 (ABC) powder/inert gas. Li et al 23 used the combination of an inert gas and ABC powder to suppress methane explosion. On the basis of the flame morphology, flame propagation velocity, explosion pressure, and booster rate, the explosion suppression mechanism was explained by the physical and chemical aspects.…”