Study on two-phase cloud dispersion from liquefied CO2 release

doi:10.1016/j.cjche.2023.01.016

Abstract

Abstract: The knowledge of two-phase cloud dispersion mechanism from HLG (hazardous liquefied gas) release is the prerequisite for accurate assessment and precise rescue of such accidents. In this paper, an experiment of two-phase cloud dispersion from liquefied CO₂ hole release is performed. The source terms, such as vapour mass fraction, release velocity and mean droplet diameter, are calculated based on thermodynamic theory. Taking phase transition of CO₂ droplets to gas into account, CFD (computational fluid dynamics) model for two-phase cloud dispersion is established. The predicted cloud temperatures at the downstream agree well with the experimental data, with the maximum relative error of 5.8% and average relative error of 2.3%. The consequence distances in the downstream direction and in the crosswise direction calculated through two-phase model are larger than those through single-phase model, with the relative differences of 57.8% and 53.6% respectively. CO₂ concentration calculated by two-phase model is smaller in the vicinity of release hole, and larger beyond 0.135 m downstream. A smaller leakage rate results in a lower CO₂ concentration and a higher cloud temperature.

Key words: Two-phase cloud, Carbon dioxide, CFD, Dispersion, Phase change

摘要： The knowledge of two-phase cloud dispersion mechanism from HLG (hazardous liquefied gas) release is the prerequisite for accurate assessment and precise rescue of such accidents. In this paper, an experiment of two-phase cloud dispersion from liquefied CO₂ hole release is performed. The source terms, such as vapour mass fraction, release velocity and mean droplet diameter, are calculated based on thermodynamic theory. Taking phase transition of CO₂ droplets to gas into account, CFD (computational fluid dynamics) model for two-phase cloud dispersion is established. The predicted cloud temperatures at the downstream agree well with the experimental data, with the maximum relative error of 5.8% and average relative error of 2.3%. The consequence distances in the downstream direction and in the crosswise direction calculated through two-phase model are larger than those through single-phase model, with the relative differences of 57.8% and 53.6% respectively. CO₂ concentration calculated by two-phase model is smaller in the vicinity of release hole, and larger beyond 0.135 m downstream. A smaller leakage rate results in a lower CO₂ concentration and a higher cloud temperature.

关键词: Two-phase cloud, Carbon dioxide, CFD, Dispersion, Phase change

Chaojie Li, Xianxin Fang, Meiling Sun, Jihai Duan, Weiwen Wang. Study on two-phase cloud dispersion from liquefied CO₂ release[J]. Chinese Journal of Chemical Engineering, 2023, 60(8): 37-45.

Chaojie Li, Xianxin Fang, Meiling Sun, Jihai Duan, Weiwen Wang. Study on two-phase cloud dispersion from liquefied CO₂ release[J]. 中国化学工程学报, 2023, 60(8): 37-45.

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Study on two-phase cloud dispersion from liquefied CO₂ release

Study on two-phase cloud dispersion from liquefied CO₂ release

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