In this study, an ammonia refrigeration room was selected as a typical scenario. Computational fluid dynamics ( CFD) was applied to study the rules of the ammonia?leakage diffusion. The ammonia?leakage diffusion in a refrigeration room with up?down ventila?tion and without ventilation was numerically simulated using the Fluent CFD software package. The ammonia concentrations in the longi?tudinal profile and the cross?section of the refrigeration room were analyzed at different times after the ammonia leakage. The numerical simulation results show that the ammonia concentration increases with height in the refrigeration room, and a lower fresh?air inlet can quickly decrease the ammonia concentration. Based on the above results, it is proposed that an ammonia?gas alarm should be installed near the ceiling to detect the leakage, and an emergency exhaust inlet should be installed near the floor to decrease the ammonia con?centration.%本文选取氨制冷机房作为典型场景,应用计算流体力学方法研究氨气泄漏扩散规律,采用Fluent软件对无通风及上下通风情况下的制冷机房氨气泄漏扩散进行了数值模拟.分析了氨气泄漏后不同时刻制冷机房纵剖面和横截面氨气浓度分布,研究了不同泄漏量下氨气浓度随高度变化的特征,提出了氨气报警器偏上安装的建议.对比上进风下排风和下进风上排风两种应急排风方案泄漏扩散的数值模拟结果,提出了应急排风进风口偏下设置的建议.
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