低压环境下泡沫灭火剂热稳定性研究

Study on thermal stability of foam extinguishing agent in low pressure environment

由泡沫生成系统、发泡倍数测定系统、泡沫热稳定性测试系统组成实验装置,使用气体检测仪监测封闭油面上方可燃气体浓度,测定两种不同类型的泡沫在低压环境下变温油面上的失效时间,研究泡沫的热稳定性。改变单一参数开展实验,探索固定温度条件下发泡倍数对两种不同类型泡沫热稳定性的影响、固定发泡倍数条件下油温对两种不同类型泡沫热稳定性的影响,研究泡沫热稳定性受泡沫发泡倍数和油温影响的规律。结果表明:在60 kPa的低压环境下,加热板温度相同时,随着泡沫灭火剂发泡倍数增大,泡沫破碎时间由长到短依次为:6、9、12倍;泡沫灭火剂发泡倍数相同时,随着加热板温度增大,泡沫破碎时间由长到短依次为:40、60、80、100、120℃。

The experimental device is composed of foam generation system,foaming multiple measurement system and foam thermal stability test system.The gas detector was used to monitor the concentration of flammable gas above the closed oil surface.The failure time of two different types of foam in the low temperature environment was measured,to study the thermal stability of foam.The effect of foaming expansion ratio at fixed temperature on the thermal stability of two different types of foams,and the effect of oil temperature on thermal stability of two different types of foams under fixed foaming expansion ratio were investigated by changing single parameters.The effect of foam expansion ratio and oil temperature on foam thermal stability was studied.The results showed that under the low pressure of 60 kPa,when the temperature of heating plate is the same,with the increase of foaming ratio of foam extinguishing agent,the breaking time of foam is 6,9 and 12 times from long to short;When the foaming agent is the same,with the increase of temperature of the heating plate,the breaking time of foam is 40,60,80,100 and 120 ℃ from long to short.