风井出口废气扩散的模拟及控制研究

Simulation and Control Study of Exhaust Gas Diffusion from a Vent Tower Port

为了解自风井出口排放出的污染物的浓度分布以及对其周围空气形成的污染范围,采用三维数值模拟的方法,对风井出口废气的对流扩散特征进行了模拟和分析,揭示了在不同外界风速和风向的条件下,出口处废气的扩散特征。计算结果表明,外界风速越高,废气扩散得越快;但因浓度衰减得也越快,故其能对大气形成污染的扩散范围加大到一定程度时又有减小的趋势;出口污染物会对距风井近距离范围内的大气产生一定程度的污染,可适当加高风井高度以使周围建筑物及人员免受污染物的危害。

In order to know the pollution area by the exhaust gas concentration field and pollutants diffused from the vent tower port, a three - dimensional numerical simulation was used to predict the exhaust gas diffusion from the port under different wind velocity and direction. The results show that the higher the wind velocity is, the faster the exhaust gas diffuse; but because the concentration attenuates fast, the diffusion area will be reduced after the diffusion area increase beyond the limit. Air around the vent tower will be polluted to some extent by the exhaust gas from the port, so the vent tower should be heightened to prevent the building and personnel from the pollutants harm.