Abstract: In order to realize the effective analysis and measurement of leakage and toxic gas diffusion state of horizontal ammonia storage tank, small- scale model and large- scale model are established. Based on the component transport model of Fluent software, the local leakage and overall diffusion of horizontal liquid ammonia storage tank are simulated. Starting from the path of ammonia diffusion and the form of gas cloud, aimed at the simulation results and the actual plant conditions, the reasonable layout scheme of ammonia detector under various meteorological conditions is proposed. Simulation results indicate that the higher the wind speed, the faster the ammonia diffusion speed in the early stage, and the higher wind speed is also conducive to dilute the concentration of harmful gases; moreover, when ammonia diffuses in a wide range of air, its flow state and formation of gas cloud shape are greatly affected by external wind speed.

Key words: ammonia; leakage diffusion, numerical simulation, detector, installation locatio