A Simulation Method of Site Selection for Liquid Ammonia Tanks

To decrease liquid ammonia leakage-induced casualties of ammonia chemical enterprises, a simulation comparison method of liquid ammonia toxicity leakage and crowd evacuation was proposed, a spatial model was constructed with Pyrosim software, using 8 liquid ammonia tanks as a layout example.The ammonia diffusion path under eight leakage scenes was analysed with FDS software by setting eight ammonia leakage points.The personnel evacuation model was built with the Pathfinder software, obtaining the crowd evacuation time under the eight scenes.Finally, the optimal site for liquid ammonia tanks in this case was determined through a comparison of ammonia diffusion path and evacuation time.Results show that among the eight candidate sites for ammonia tanks, the Leakage Scene 4 shows the longest time (78 s) for diffusion to the two evacuation exits, which is longer than the crowd emergency evacuation time (73 s) in the scene.Therefore, the Leakage Scene 4 can be used for the setting of liquid ammonia tanks.The obtained conclusions provide a safe suggestion for the scientific planning of the liquid ammonia storage sites of chemical enterprises.