基于纵向温度量化分析高倍泡沫抑制LNG蒸发

高倍泡沫抑制LNG蒸气扩散研究中鲜见温度细化分析,提出通过泄漏池底-140℃以下温度维持时间衡量控害效果。分析发现温度变化可反映蒸发快慢;施加稳定性高、发泡倍数小的泡沫及增大泄漏量和泡沫覆盖高度利于降低平均蒸发率;水合物层、冰层降低蒸发率效果强于泡沫。LNG泄漏高度点之上,泄漏量大时会出现明显的“V”形波动,波动幅度从上到下逐渐增大而后再逐渐减小,波动次数随泡沫高度减小而增多。

LNG Vaporization Suppression with High Expansion Foam Based on Longitudinal Temperature Quantitative Analysis

The research on the suppression of LNG vapor diffusion by high expansion foam is carried out and it is put forward that the control effect is measured by maintaining duration as temperature below -140 ℃ at the bottom of pool. It is found that the temperature change can reflect the rate of evaporation. Applying foam with high stability and small foaming multiple and increasing the amount of leakage and the height of foam cover are beneficial to reduce the average evaporation rate. The evaporation rate decrease of hydrate layer and ice layer is better than that of foam. A- bove the LNG leakage height point, there will be obvious "V" shaped fluctuation with a large amount of leakage, and the fluctuation range will gradually increase from top to bottom and then gradually decrease, and the number of fluctu- ation will increase with the decrease of the bubble height.