海上模块化LNG接收终端泄漏扩散安全特性分析

Analysis on the Safety Characteristics for the Leakage and Diffusion of the Offshore Modular LNG Receiving Terminal

研究表明：启动流量、绝热层的导热系数和厚度可以明显改变管内流体的温度分布,且启动流量越大、绝热层导热系数越小、厚度越大、管内流体温度越高,生成水合物的风险越小。为了分析上模块化LNG接收终端平台生产运行的安全性,基于相关泄漏扩散理论,利用Fluent软件分别针对平台上多个关键工艺处理模块进行了泄漏扩散规律数值模拟,并进行了LNG泄漏扩散风险分析。研究结果表明,风速会有效降低平台上LNG泄漏扩散的危险性。CGB平台上各工艺模块应分别考虑燃烧爆炸风险与人员健康风险。当LNG发生中度泄漏（20%管径）时,各种气象条件时最大落地浓度均达不到爆炸下限;当重度泄漏（100%管径）时,各种气象条件时最大落地浓度均可达到爆炸下限,达到爆炸下限浓度半径为13.3~91.7 m。

To analysis the production operation safety of the offshore modular LNG receiving terminal,based on the leakage diffusion theory,Fluent software was used to simulating the leakage and diffusion characteristics of the key process modules on the platform,and the risk analysis of the LNG leakage and diffusion was also carried out.The research results show that the stronger wind will reduce risks of the LNG leakage and diffusion effectively.The combustion explosion risk and the personal health risk should be considered simultaneously.When the middle degree leakage（20% diameter） occurred,the max concentration of the gas on the ground under any meteorological condition cannot reach the low explosive limit.On the contrary,when the severe leakage（100% diameter） occurred,the max concentration of the gas on the ground under any meteorological condition will reach the low explosive limit,and the radius of the low explosive limit concentration is 13.3 ~91.7 m.