不同发泡方式下泡沫对溶剂油蒸气密封性能研究

Study on sealing performance of foam to solvent oil vapor under different foaming methods

基于美国环境保护署通量室试验模型,在压缩空气泡沫产生方式下探究了发泡倍数、泡沫厚度、泡沫析液时间等因素对合成型泡沫灭火剂密封性能的影响,进一步对比研究了压缩空气泡沫和吸气式泡沫的密封性能,明确了泡沫密封性能影响作用机制。结果表明:在压缩空气泡沫产生方式下,合成型泡沫灭火剂的泡沫稳定性并未随发泡倍数增加而持续增强;泡沫中液膜对油蒸气的抑制是泡沫密封性能的重要作用机制,发泡倍数越低泡沫中液体含量越高,对油蒸气密封性能越强,建议优先使用10倍以下泡沫处置120#溶剂油泄漏事故;同一倍数条件下压缩空气泡沫稳定性较高,液体含量高于吸气式泡沫,密封性能优于吸气式泡沫。

Based on the flux chamber test model developed by the United States Environmental Protection Agency,this study investigates the impact of several factors,such as expansion,foam thickness,and drainage time,on the sealing performance of synthetic foam extinguishing agents.The investigation is conducted under the production mode of compressed air foam.Additionally,the study compares and analyzes the sealing performance of com‑pressed air foam and aspirated foam,aiming to elucidate the mechanisms that influence foam sealing performance.The results indicate that the foam stability of the synthetic foam extinguishing agent does not necessarily increase with expansion.It is found that the inhibition of the liquid film on oil vapor in the foam plays a crucial role in foam sealing performance.Specifically,lower foaming ratios result in higher liquid content in the foam,ultimately enhancing the sealing performance against oil vapor.Based on these findings,it is recommended to employ foam with a expansion of less than 10 for tackling 120#solvent oil leakage accidents.Furthermore,the study shows that,under the same expansion,compressed air foam exhibits superior stability,higher liquid content,and better sealing performance compared to aspirated foam.