Experimental Study On The Preparation Of Fluorine-free Synthetic Foam Extinguishing Agent And Its Synergistic Extinguishing Effectiveness With 2-BTP

With the rapid development of the national chemical and energy industry,serious fire accidents caused by the large range of flammable liquid leakage and combustion happen occasionally.As one of the typical disasters of liquid fire,oil fire often brings great difficulties to the rescue work because of its characteristics such as high calorific value,fast-burning,and very easy to reignite.Foam fire-extinguishing is one of the most used methods to extinguish oil fire because of its large spray range and good isolation and cooling property.However,the existing foam fire extinguishing agents still have the following shortcomings: Aqueous film forming foam extinguishing agent has serious environmental pollution problems;It has not been determined whether foam extinguishing agents containing short-chain fluorocarbon surfactants are environmentally friendly;Fluorine protein foam extinguishing agent also has some defects such as low quality and poor extinguishing effect.Therefore,the research of cleaner and more efficient foam extinguishing agents and the improvement of its extinguishing efficiency are of great significance for the effective control of oil fire and the reduction of environmental pollution.Based on the above background,a new type of non-fluorine synthetic foam extinguishing agent was prepared by screening and testing a variety of materials.The combined effect of the foam extinguishing agent and the clean gas 2-Bromo-3,3,3-Trifluoro Propene(2-BTP)was also investigated.The main research conclusions are as follows:(1)Compared with a single surfactant aqueous solution,the foaming ability of the foaming system with the combination of hydrocarbon and organosilicon surfactants is significantly improved while maintaining a lower surface tension.Compared with a single foaming stabilizer,the combination of viscous type and non-viscous type foaming stabilizer can significantly enhance the stability of the foam system without affecting its foaming performance.The non-fluorine synthetic foam based on the above-mentioned components has good foaming property and stability.(2)The effects of the ratio of gas to liquid flow on the foaming ratio,fire extinguishing,and fire-resisting time of the foam were investigated.With the increase of the gas-liquid flow ratio,the foaming ratio first increases and then decreases,and the foaming ratio reaches the maximum when the gas-liquid flow ratio is 42.The foam fireextinguishing time decreases first and then increases;the fire-resisting time increases first and then decreases,and the fire-resisting time is the shortest and the fire-resisting time is the longest when the gas-liquid flow ratio is 10.(3)The synergistic extinguishing effect of 2-BTP and non-fluorine synthetic foam was investigated.The experimental results show that the effect of 2-BTP and nonfluoride synthetic foam on the fire extinguishing efficiency is significantly different.Within a specific concentration range,the combination of the two has a better synergistic effect.When the volume flow ratio of 2-BTP to non-fluoride synthetic foam is 1% or 2%,the excellent fire resistance of the foam can be retained,and the overall fire extinguishing efficiency can be improved by about 48%.When the volume flow ratio of 2-BTP and foam mixture is 3%,5%,and 10%,the fire extinguishing and antiburning performance of foam decreases sharply,and the combined fire extinguishing efficiency is low.There are 46 figures,19 tables,and 102 references in this paper.