高倍泡沫覆盖率表征量化研究

Quantitative investigation on submergence rate of high expansion foam applied to LNG liquid

为了提高高倍泡沫覆盖率,更快地抑制LNG蒸气扩散,使用田口试验、函数求解对192个参数进行对比分析,研究泡沫高度、体积随时间、集泡器截面变化规律,泡沫高度、体积增长速度之间及其与发泡阶段、发泡筒位置、围堰截面、泡沫性能的关系。结果表明,泡沫上升高度随时间呈三次函数形式变化,上升速率多半是先增加后减小,最大值之间可相差10多倍,要在更短的时间内达到规定的泡沫高度,在相同的发泡速率下需注意围堰截面形状与截面积的设计。

In order to improve the coverage of high-fold foam and inhibit the LNG vapor diffusion faster,using Taguchi test,functional analysis to study the change rule of foam height,volume with time,and the cross-section of the bubble collector through the comparative analysis of 192 parameters,the relationship between the foam height and volume growth rate and their relationship with the foaming stage,position of the foaming cylinder,cross-section of the cofferdam,and performance of the foam.The results show that the rising height of foam with time is a cubic function of the form of change,and the rate of rise is mostly increased first and then decreased,while the difference between maximum value can be more than 10 times.To achieve the required foam height in a shorter period of time,under the same rate of foaming,it is necessary to pay attention to the cofferdam cross-sectional shape and cross-sectional area of the design.