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为研究含草酸钾(K2C2O4)细水雾的灭火效能,用改进的杯式燃烧器开展灭火试验。通过超声雾化系统将K2C2O4溶液雾化,在空气流量为40 L/min条件下,以协流的方式进入火焰区,测定不同浓度K2C2O4细水雾抑制甲烷火的最小灭火浓度(MEC)。应用差示扫描量热仪(DSC)测定溶液比热容,得到溶液比热容与温度的一般关系。结合灭火的热机理,量化不同浓度的K2C2O4溶液灭火剂的物理和化学作用。结果表明,K2C2O4可显著提高纯水的灭火效率,且K2C2O4的质量分数为2%时,化学灭火作用最好,K2C2O4对灭火效率的影响取决于增加的化学作用和降低的纯水蒸发能力之间的竞争关系。
In order to study the fire extinguishing efficiency of water mist containing potassium oxalate (K2C2O4), a fire extinguishing test was conducted with an improved cup burner. The K2C2O4 solution was atomized by ultrasonic atomization system. At the air flow rate of 40 L / min, the mixed solution entered the flame zone by the co-flow method. The minimum fire extinguishing concentration (MEC) of methane fire suppression with different concentrations of K2C2O4 water mist was measured. Differential scanning calorimetry (DSC) was used to determine the specific heat capacity of the solution, and the general relationship between the specific heat capacity and the temperature of the solution was obtained. Combined with the thermal mechanism of fire extinguishing, the physical and chemical effects of different concentrations of K2C2O4 solution fire extinguishing agent were quantified. The results show that K2C2O4 can significantly improve the fire extinguishing efficiency of pure water. When K2C2O4 is 2%, the chemical fire extinguishing effect is the best. The effect of K2C2O4 on fire extinguishing efficiency depends on the increase of chemical reaction and the decrease of pure water evaporation capacity Competition.