摘要
铺展性能和隔热性能是衡量泡沫灭火剂的重要指标。为优选更适合变压器油火灾的泡沫灭火剂,对水成膜泡沫灭火剂(Aqueous film-forming foam,AFFF)、氟蛋白泡沫灭火剂(Fluoroprotein foam,FP)和合成泡沫灭火剂(Synthetic foam,S)3类常见泡沫灭火剂在不同初始温度变压器油面的铺展特性及外加热辐射下泡沫在高温油面的隔热性能开展试验研究。结果显示:AFFF泡沫铺展速率最快,其次是FP泡沫,S泡沫铺展最慢。在外加热辐射条件下,AFFF泡沫层温度变化及泡沫高度衰减最慢,FP泡沫稍快,S泡沫最快。表明AFFF泡沫隔热性能最好,S泡沫最差。此外,在前人建立的泡沫质量蒸发模型基础上,针对FP和S泡沫提出了质量蒸发模型的修正系数,修正后的模型能更好地预测外加热辐射下FP和S泡沫蒸发质量的变化。
Spreading performance and insulation characteristics are important indicators to measure foam extinguishing agents.To select a more suitable foam extinguishing agent for transformer oil fires,this study conducted experimental on common foam extinguishing agents aqueous film-forming foam extinguishing agent(AFFF),Fluoroprotein foam extinguishing agent(FP),and Synthetic foam extinguishing agent(S).The spreading performance of foam on the transformer oil surface at different initial temperatures and insulation characteristics of foam at high-temperature oil surface under external heat radiation was studied experimentally.The results indicate that the spreading rate of AFFF foam is the fastest,followed by FP foam,and the slowest spreading of S foam,as influenced by the content of fluorocarbon surfactant.Due to the formation of aqueous films,the influence of high-temperature oil on the spreading process of AFFF foam is limited.The protein adsorption at the gas-liquid interface in FP foam generates a high viscoelastic layer and increases the foam stability,and the spreading process is less affected by the high-temperature oil surface.However,the stability of S foam without fluorocarbon surfactant is poor,and its spreading curve at high-temperature oil surfaces fluctuates greatly.Under the condition of external heat radiation,the height changes of all three types of foams show two phases of expansion and decay.The temperature variation of the AFFF foam layer and foam height decay is the slowest,FP foam is slightly faster,and S foam is the fastest.It means that AFFF foam has the best thermal insulation characteristics and S foam has the worst.In addition,the foam mass evaporation model developed by Lattimer could better predict the variation of AFFF foam evaporation mass in this study.The correction coefficients are proposed for FP and S foam mass evaporation models,which are 0.8262 and 0.7147,respectively.The corrected model has a better fit compared to the original model,which could better predict the changes in the evaporative mass of FP and S foam under external heat radiation.
作者
张佳庆
尚峰举
王东升
孔得朋
何旭
ZHANG Jiaqing;SHANG Fengju;WANG Dongsheng;KONG Depeng;HE Xu(State Grid Anhui Electric Power Research Institute,Anhui Province Key Laboratory of Electric Fire and Safety Protection(State Grid Laboratory of Fire Protection for Transmission and Distribution Facilities),Hefei 230601,China;College of Mechanical and Electronic Engineering,China University of Petroleum,Qingdao 266580,Shandong,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2023年第8期2653-2660,共8页
Journal of Safety and Environment
基金
国网安徽省电力有限公司科技项目(52120320006U)。
关键词
安全工程
变压器火灾
泡沫灭火剂
泡沫铺展
泡沫隔热
safety engineering
transformer fire
foam extinguishing agent
foam spreading
foam insulation 2660
