Abstract:

In order to effectively reduce the vaporization rate of LNG, three parameters were proposed and weight factors were introduced. Through Taguchi experiments, the quantitative research was conducted on the foaming ratio and stability of high-pressure foams, the amount of LNG leakage, and the height of foam coverage, to investigate their effects on suppressing LNG evaporation and vapor diffusion. The results show that foams with high foaming ratio and good stability are more conducive to reducing the initial volume fraction of vapor, while foams with poor stability are more conducive to vapor diffusion; the leakage volume has a significant impact on the initial volume fraction of vapor, while the foam coverage has a relatively smaller impact on the later volume fraction of vapor accumulation; the foam height has a minor impact on the initial volume fraction of vapor, but has a significant impact on the ease of vapor diffusion; the foam performance and coverage height at different spatial points have different effects on the speed of the decrease in vapor volume fraction; the leakage volume and foam coverage height have different effects on the speed of the decrease in vapor volume fraction 10 minutes after the cessation of adding foam.

Key words: high expansion foam, liquefied natural gas (LNG) vaporization rate, heat vapor, release amount, foam properties