高含CO2天然气泄漏危险性数值计算研究

Numerical calculation study on leakage hazard of natural gas highly containing carbon dioxide

研究欠膨胀射流条件下高含CO2天然气的泄漏危险性。在理论分析的基础上,采用计算流体力学方法,针对特定场景,模拟CH4和CO2的质量分数分布并分析燃爆风险区域。研究表明,在没有周围地形因素或者特殊气象条件干扰的情况下,以欠膨账射流方式发生高含CO2天然气持续稳态泄漏时,在地面附近形成的窒息区域主要在泄漏口周边,并且室息区域的空间分布范围远大于燃爆区域。

Study the leakage risk of high-C02 natural gas under under-expanded jet conditions.Based on the theoretical analysis,computational fluid dynamics method was used to simulate the concentration field distribution and analyze the combustion and explosion risk area of CH4 and C02 in specific scenarios.The study showed that in the absence of surrounding topographical factors or special meteorological conditions,the continuous steady-state leakage of high-C02 containing natural gas produced by under-expanded jets forms a suffocating area near the ground,mainly near the leakage orifice and the spatial distribution of the asphyxiation area is far greater than that of the explosion area.