Abstract: In this paper, potassium chloride and potassium carbonate were used as superfine water mist additives, pure water superfine water mist was used as a control, anhydrous ethanol, 90% ethanol, and 75% ethanol were used as fuel, and a novel ultra-fine water mist critical fire extinguishing concentration experiment device was used. Experiments show that as the degree of alcohol increases, the critical fire extinguishing concentration of the potassium salt ultrafine water mist to extinguish the ethanol flame also gradually increases, and the fire extinguishing effect of the ultrafine water mist containing potassium carbonate is slightly better than that of the ultrafine water mist containing potassium chloride.

Key words: ultrafine water mist, ethanol flame, critical extinguishing concentration, potassium chloride, potassium carbonate