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为了研究LNG泄漏扩散过程及危害,建立了引入时间参数的高斯烟羽混合模型,利用MATLAB工具对LNG泄漏扩散过程进行动态模拟,解决了高斯烟羽模型不能模拟连续泄漏源泄漏初期浓度分布的问题。提出了非点源高斯烟羽混合模型,可预测液池、大孔等非点源的泄漏扩散过程,并利用Burro 9号LNG泄漏扩散试验进行模型验证。研究了风速、大气稳定度等对LNG泄漏扩散所形成的危险区域的影响,结果表明:风速对LNG泄漏扩散的影响显著,风速越大,扩散越快,扩散达稳定后所形成的危险区域面积越小;大气越稳定,扩散越慢,危险区域面积越大。
In order to study the process of LNG leakage and spread, a mixed model of Gaussian plume with time parameters was established, and the dynamic simulation of LNG leakage and diffusion was carried out by using MATLAB tool to solve the problem that Gaussian plume model can not simulate the initial concentration distribution of continuous leakage source leakage . A non-point source Gaussian plume model was proposed to predict the leakage of non-point source such as liquid pool and macropore. The Burro 9 LNG leakage and diffusion test was used to verify the model. The effects of wind speed and atmospheric stability on the hazardous area formed by the leakage of LNG are studied. The results show that the wind speed has a significant effect on the leakage and diffusion of LNG. The larger the wind speed, the faster the diffusion and the more stable the area of the dangerous area The smaller; the more stable the atmosphere, the slower the spread, the greater the size of the hazardous area.