基于FLACS的汽油储罐可燃气体泄漏的流场分析

罐区油品储存量大，具有较高的泄漏风险，一旦发生泄漏，可燃气体遇火源易发生火灾、爆炸等事故，甚至引发后果更为严重的多米诺效应，而可燃气体探测器作为重要的保护层持续监控现场，对保障现场安全生产和风险预警具有重大意义。以某罐区汽油泄漏为例，通过FLACS软件建立汽油储罐泄漏扩散计算流体动力学(computational fluid dynamics, CFD)模型，根据现行标准GB/T 50493—2019在泄漏源周围设置候选监测点，结果表明：部分距泄漏源10 m范围内的监测点不能检测到可燃气体，说明探测器的设置应遵循可燃气体扩散规律；对于比空气重的可燃气体的检测，建议探测器的最佳安装高度为0.3 m。

Flow field analysis of combustible gas leakage in gasoline storage tank based on FLACS

The tank farms store a large volume of oil products, and have a high risk of leakage. Once a storage tank leaks, the combustible gas is prone to fire, explosion and other accidents when encountering a fire source and this can even trigger a more serious domino effect. A combustible gas detector is an important safety device since it continuously monitors the site and provides early warning of danger. In this work, taking a gasoline tank leakage as an example, a CFD model of gasoline tank leakage diffusion was established using FLACS software, and the candidate monitoring points were set by the latest current standard GB/T 50493—2019. The results showed that some monitoring points within 10 m from the leak source could not detect combustible gas, and the setting of the detector should follow the law of combustible gas diffusion. To detect combustible gases heavier than air, it is recommended that the optimal installation height of the detector is 0.3 m.