装卸作业接头密封圈失效LNG泄漏数值模拟研究

Numerical simulation of LNG leakage due to failure of joint sealing ring in loading and unloading operation

关键词:  LNG  装卸作业  泄漏  数值模拟  FLACS

Key words:  LNG  loading and unloading operation  leakage  numerical simulation  FLACS

摘要:

在LNG槽车装卸作业过程中,LNG快速接头长时间在低温高压下工作,接头的密封圈极易损坏,导致LNG泄漏,其后果不堪设想。使用FLACS建立LNG泄漏扩散模型,并以Falcon系列实验的现场实验数据验证了该LNG泄漏模型有效性。再以装卸作业时LNG快速接头密封圈失效导致LNG泄漏扩散为研究对象,建立LNG装车区实体模型,并分析该泄漏工况下LNG扩散规律、危险区域范围、可燃气云TNT当量和影响因素。结果 表明,在密封圈完全失效的情形下,LNG扩散形成的燃烧爆炸危险区域最大直径为58 m,形成的可燃气体云团体积最大为178.7 m³,其TNT当量最大约为24 kg。 

Abstract:

In the loading and unloading process of LNG tanker, the LNG quick connector would work under low temperature and high pressure for a long time and the sealing ring of the connector was susceptible to damage, which would lead to LNG leakage and unimaginable consequences. In this study, the LNG leakage diffusion model was established by FLACS and the effectiveness of the model was verified by the field experimental data of Falcon series experiments. Taking LNG leakage and diffusion caused by sealing ring failure of LNG quick connector during loading and unloading operation as the research object, the solid model of LNG loading area was established, and the LNG diffusion law, dangerous area range, TNT equivalent of combustible gas cloud and influencing factors under the leakage condition were analyzed. The results showed that in the case of complete failure of the seal ring, the maximum diameter of the combustion and explosion-hazardous area formed by LNG diffusion was predicted to be 58 m, while the maximum volume of combustible gas cloud and the maximum TNT equivalent was 178.7 m³ and about 24 kg, respectively.