甲醇和异丙醇池火泡沫灭火试验研究

Experimental study on foam extinguishment of methanol and isopropanol pool fires

对直径2.5 m的甲醇和异丙醇池火发展过程、冷却保护和泡沫灭火进行了试验研究。结果表明,异丙醇池火的发展较甲醇池火迅速;采用冷却水保护储罐罐壁能够显著抑制池火的发展和热辐射;受燃液表面和火焰的破坏作用,灭火泡沫释放至燃液表面后需经历一定延迟时间才能对池火产生影响,该延迟时间随泡沫混合液供给强度的增大而缩短;推算出直径2.5 m甲醇和异丙醇池火泡沫灭火的泡沫混合液最佳供给强度分别为4.26,5.02 L/(min·m^(2))。

The development process,cooling protection and foam extinguishment of methanol and isopropanol pool fires with diameter of 2.5 m were studied.The results showed that the isopropanol pool fire develops faster than the methanol pool fire during the initial burning stage.Cooling the tank wall with water could significantly influence the development of pool fires.Affected by the dehydration effect of liquid surface and flame,there was a time delay between the release of firefighting foam onto the liquid surface and influence on the pool fire.As the application rate of the foam solution increased,the delay time was shortened.The optimum application rates of foam solution for successful fire extinguishment of methanol and isopropanol pool fires with a diameter of 2.5 m were determined as 4.26,5.02 L/(min·m^(2)),respectively.