Abstract

In order to study the synergistic fire extinguishing effect of potassium salt additives in water mist, the fire extinguishing experiments were carried out with the two of seven kinds of potassium salt additives (KNO₃, CH₃COOK, K₂C₂O₄, KCl, K₂CO₃, K₂SO₄ and KHCO₃) with the same mass fraction. The results show that the fire extinguishing time of K₂C₂O₄ - K₂SO₄, K₂CO₃- CH₃COOK, K₂CO₃ - KCl, KNO₃- K₂SO₄, CH₃COOK - K₂SO₄ is less than the fire extinguishing time of the single additive, which indicates that the chemical inhibiting effects of the additives are enhanced, and there is a synergistic fire extinguishing effect among the potassium additives combinations which are mentioned above. Finally, the mechanism of the synergistic fire extinguishing effect is conjectured as follows: under the activation of high-temperature steam in the flame zone, a kind of substance after melting or decomposing accelerates the generation rate of fire extinguishing active substances, thereby increasing the extinguishing efficiency.