改变垫水层沸点的薄层扬沸实验研究

扬沸是油池火灾的一种特殊现象,燃料和垫水层交界面的过热温度和沸腾状态是决定扬沸是否发生以及发生时间的最主要因素,过热温度由沸点决定。在垫水层中添加氯化钠能够改变垫水层的沸点,从而改变交界面的过热温度。在垫水层添加氯化钠使其成为饱和氯化钠水溶液,对此条件下的油池火燃烧进行实验探究,以验证前人关于扬沸临界条件的研究结果,并为扬沸防治提供思路。垫水层改变为饱和氯化钠溶液后,柴油实验组均没有发生扬沸,且观察到火焰温度和热辐射强度的下降。表明此方法可以有效抑制扬沸的发生。

Experimental research on thin-layer boilover by changing the boiling point of water layer

Boilover is a particular phenomenon in oil pool fires. The superheating temperature and boiling state at the interface between the fuel and the water layer are the most critical factors determining whether and when boilover occurs, and the boiling point determines the superheating temperature. Adding sodium chloride to the water layer can change the boiling point of the water layer, thereby changing the superheating temperature of the interface. In this paper, sodium chloride is added to the water layer to make it a saturated sodium chloride aqueous solution, and the oil pool fire combustion under this condition is experimentally investigated to verify the results of previous research on critical conditions of boilover, and provide ideas for the prevention and control of boilover. After the water layer was changed to saturated sodium chloride solution, no boilover occurred in the diesel experimental groups, and the decrease of flame temperature and radiation intensity was observed. It is shown that this method can effectively suppress the occurrence of boilover.