Numerical Simulation Of Leakage Diffusion In LNG Storage Tank

As an important storage device in the receiving station,LNG storage tanks are also a major source of danger,and safety issues can't be neglected.Leakage is the main type of accident in LNG storage.Once a leak occurs in LNG storage tanks,it will cause serious consequences for equipment,operators and the environment.Therefore,research on the impact of LNG storage tanks after leakage is crucial.Through the analysis of the failure mode of LNG storage tank leakage,the leakage problem of LNG storage tank should be divided into two types: gas phase leakage and liquid phase leakage.The gas phase leakage is divided into continuous leakage and instantaneous leakage according to whether the flow state reaches the sound velocity,and the liquid phase is divided into heavy gas cloud leakage and liquid pool leakage according to the phase state of the diffusion cloud.Based on different leakage conditions,the matching model is used to simulate,and the leakage concentration field and temperature field distribution of LNG storage tanks in three-dimensional space are obtained.The effects of different parameters such as leakage source height,leakage diameter,ambient wind speed and atmospheric stability are analyzed,and the influence of each parameter on the concentration and temperature field is obtained.Refer to the lower explosion limit and the low temperature to specify the hazardous area of concentration and temperature field,analyze the influence of each parameter on the dangerous area,and lay the foundation for risk assessment.