车库内氢气扩散和分布状态的数值模拟

发布时间：2018-04-01 05:11

  本文选题：安全工程　切入点：车库　出处：《安全与环境学报》2017年05期

【摘要】：为研究车库内氢气连续性泄漏的浓度分布和聚集状态,采用ICEM-CFD软件建模,利用Fluent软件对氢气连续性泄漏过程进行了模拟。通过分析监测点氢气物质的量分数、氢气分布和可燃性区域体积分数,研究了横梁及其间距(L)、自然通风、通风口面积(A)对车库内氢气的扩散和分布状态的影响。结果表明:在密闭状态下,无横梁时可燃性区域最小,L=3 m时可燃性区域最大;当A=0.5 m2时,在自然通风的作用下,车库底部氢气物质的量分数明显下降,但车库中部和上部氢气物质的量分数与密闭时相近;当A=1 m2时,虽然初始阶段氢气物质的量分数上升很快,但很快就趋于稳定,监测点氢气物质的量分数均在爆炸下限以下,此时自然通风能够消除氢气爆炸的风险。
[Abstract]:In order to study the concentration distribution and accumulation state of continuous leakage of hydrogen in garage, ICEM-CFD software was used to model the process of continuous leakage of hydrogen, and Fluent software was used to simulate the process of continuous leakage of hydrogen. The effects of crossbeam and its spacing, natural ventilation and vent area A) on the diffusion and distribution of hydrogen in the garage were studied. When there is no cross beam, the combustible region is the biggest when the minimum value of fuel is 3 m, and the quantity fraction of hydrogen in the bottom of the garage decreases obviously under the action of natural ventilation, but the fraction of hydrogen in the middle and upper part of the garage is similar to that in the closed garage. When the concentration of hydrogen is 1 m ~ 2, the hydrogen content increases rapidly at the initial stage, but it tends to be stable soon, and the hydrogen content at the monitoring point is below the lower limit of explosion. At this time, natural ventilation can eliminate the risk of hydrogen explosion.
【作者单位】： 南京工业大学安全科学与工程学院江苏省危险化学品本质安全与控制技术重点实验室;
【分类号】：X932
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本文编号：1694111