A Study On The BLEVE Dispersion Characteristics Of Dangerous Liquefied Gases

method in our life and production. So the latent secure problem caused by those pressured vessels in the production, utilization and the transportation is concerned. One of the most dangerous types of accidents with pressure-liquefied materials is the boiling liquid expanding vapor explosion (BLEVE), which has been studied as a hot spot in the past 20 yearsIn this paper the CFD approach has been successfully applied to the simulation of the heat transfer and mass media movement between droplets and the material cloud during a BLEVE event. The results from a number of 3-D CFD based studies are compared with the available small-scale experiment results. The results show that the present model and numerical simulation are reliable. This paper carried on Euler-Lagrangian approach to the numerical simulation assuming that droplets have been formed in the vessel position. The droplet vaporization is modeled in detail using the droplet break up model, the droplet evaporation model, the stochastic model, and made use of C language programming for droplet initial velocity as well as the R-R droplet diameter distribution. This provides a greater understanding of physical processes between droplet vaporization and cloud formation during the BLEVE, including the droplet boiling evaporation rate, diameter distribution, temperature distribution and the cloud volume changes, cloud mass changes, cloud expansion through the air. Subsequently, the effects on the BLEVE of changing the surrounding wind speed, different medium nature are also shown.This paper also compares the simulation results among liquid ammonia, liquid chlorine and the base case. All difference during the droplet evaporation and heat transfer process may be accounted for by the material properties. An analysis of the impact of wind speed under different stages of cloud dispersion is conducted. The simulation results of comparison between this case model and the traditional box model indicates that this new method can overcome some insufficiencies of the box model and have a good optimization.This paper illustrates that CFD methods can be used as a tool to simulate BLEVE and cloud dispersion. This work has a positive role in promoting CFD methods and deepening of the BLEVE theory. This provides a theoretical basis for prevention and management related to accidents, lays the scientific foundation for the security-related construction projects.