瓦斯电厂甲烷泄漏CFD模拟研究

CFD Simulation Study on Methane Leakage in Gas Power Plants

瓦斯电厂需要大量管道进行甲烷输送,在长期运行过程中由于管道腐蚀等原因,厂房会出现甲烷泄漏现象,使得环境中甲烷浓度达到燃爆浓度。对山西某瓦斯电厂采用CFD数值模拟方法,模拟在厂房散热通风条件下不同位置甲烷泄漏的浓度分布情况,为散热通风情况下甲烷泄漏的预防和控制提供有效理论依据。研究发现,厂房内不同位置风场的变化对甲烷气体泄漏浓度分布情况有着重要影响,在厂房中部位置,甲烷气体向下运动并由机械排风机排出;在靠近厂房两侧大门位置,甲烷气体在多重作用下向厂房上部运动,使得除泄漏口附近外,厂房顶部靠近屋顶处甲烷气体浓度最高。该研究为瓦斯电厂散热通风条件下甲烷泄漏报警器的布置提供了量化参考。

Gas power plants require a large number pipelines for methane transportation.During long-term operation,due to pipeline corrosion and other reasons,methane leakage may occur in the factory,causing the methane concentration in the environment to reach the explosive concentration.The CFD numerical simulation method is used to simulate the concentration distribution of methane leakage at different locations under the conditions of heat dissipation and ventilation in a certain gas power plant in Shanxi,while provided an effective theoretical basis for the prevention and control of methane leakage under heat dissipation and ventilation conditions.Research has found that the changes in wind fields at different locations within the factory building have a significant impact on the distribution of methane gas leakage concentration.For the central position of the factory building,methane gas moves downward and is discharged by mechanical exhaust fans.For positions close to the doors on both sides of the factory building,methane gas moves towards the upper part of the factory building under multiple actions,resulting in the highest concentration of methane gas near the roof of the factory building,except for the vicinity of the leakage port.This study provides a quantitative reference for the layout of methane leakage alarms in gas power plants under heat dissipation and ventilation conditions.