Reducing the intensity of thermal radiation at the sublayer extinguishing of alcohols by ecologically acceptable aerosols

Abstract

This paper has theoretically substantiated and experimen-tally established the intensity of thermal radiation at burning and sublayer extinguishing of alcohols with environmentally acceptable aerosols. An installation has been improved that determines the effectiveness of sublayer extinguishing with fire-extinguish-ing aerosols; a procedure that has been devised for deter-mining the intensity of thermal radiation implies equipping it with an additional heat flow meter HFM-01 at a distance of 30 and 60 mm. The task to establish the intensity of thermal radiation when burning alcohols and its impact on the process of sublay-er extinguishing of alcohols with aerosols has been solved. The dependence of sublayer extinguishing efficiency on thermal radiation implies that the fire extinguishing aerosol completely shields the surface of the combustible liquid against its action. The result of this study has established that the intensity of thermal radiation at a distance of 60 and 30 mm from the sur-face of an alcohol flame with an area of 234 cm2 ranges from 0.8 to 4.7 kW/m2; the intensity of burning and, accordingly, radiation, maximizes on seconds 30–40 of burning. It has been found that the intensity of thermal radiation for ethanol decreases with the addition of an aerosol with an intensity of up to 0.2 g/s, and decreases even more at the intensity of supply from 1.2 g/s. With a further increase in the intensity of aerosol supply, the radiation intensity begins to decrease, probably due to a decrease in the rate of combus-tion. In this case, the flame first decreases in size up to 2 times, and then, after 2–3 seconds, it goes out. The use of fire-ex-tinguishing aerosol for …