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为了研究有限空间作业时通风引起的有害气体扩散规律,分析其发生毒害及火灾、爆炸的风险性,利用FLUENT软件对有限空间通风状态下的气体扩散进行数值模拟,并对不同时刻的硫化氢、甲烷浓度变化进行分析。模拟结果表明:虽然通风有助于有害气体的浓度降低,但非常有限,即通风55分钟后,整个区域区域动态平衡,各气体的整体浓度保持不变,区域的毒害及火灾、爆炸风险性依然很高,因此人员进入作业要采取有效预防毒害以及火灾、爆炸的措施,而且作业时,应按30m3/h~50m3/h提供新风,此时人员位于新风直吹区域可保持相对安全。
In order to study the regularity of harmful gas diffusion caused by ventilation during limited space operation and to analyze the risk of poisoning and fire and explosion, the numerical simulation of gas diffusion under the condition of limited space ventilation was conducted by using FLUENT software. The hydrogen sulfide, Methane concentration changes were analyzed. The simulation results show that although the ventilation helps to reduce the concentration of harmful gases, it is very limited, that is, after 55 minutes of ventilation, the entire region is dynamically balanced and the overall concentration of the gases remains unchanged. The poisoning, fire and explosion risks in the region are still Therefore, personnel should take effective measures to prevent poisoning, fire and explosion when entering the homework. In addition, the operation should provide fresh air at a rate of 30m3 / h ~ 50m3 / h. In this case, the personnel may be relatively safe in the fresh air blowing area.