High expansion foam is widely used to mitigate cryogenic LNG spills, which is a major type of process safety accident. The stability of the foam affects the performance of hazard mitigation after cryogenic LNG spills. Forced convection and thermal radiation are key external factors affecting the foam stability, which depends on the foam drainage and breakage rates. The goal of this paper is to research the stability of high expansion foam under convection intensity of 0∼6 m/s and thermal radiation intensity of 0∼420 W/m² following the actual environmental conditions through experiments and establish correlation models for predicting foam drainage rate and breakage rate based on the experimental results. The results show that increasing forced convection and thermal radiation will accelerate foam breaking, with forced convection having a greater effect, shortening the time of effective prevention in high expansion foam. The results of this work will guide high expansion foam mitigating LNG leakage accidents in complex environmental conditions.

高倍泡沫广泛用于缓解低温液化天然气泄漏，这是一种主要的过程安全事故。泡沫的稳定性影响低温液化天然气泄漏后的减灾性能。强制对流和热辐射是影响泡沫稳定性的关键外部因素，这取决于泡沫的排水和破损率。本文的目的是通过实验研究高倍泡沫在对流强度0∼6 m/s和热辐射强度0∼420 W/m ²下的实际环境条件下的稳定性，并建立泡沫预测的相关模型。排水率和破损率基于实验结果。结果表明，增加强制对流和热辐射会加速泡沫破裂，其中强制对流作用更大，缩短了高倍泡沫的有效预防时间。这项工作的结果将指导高倍泡沫在复杂环境条件下减轻液化天然气泄漏事故。