基于恶臭气体扩散数值模拟的垃圾中转站选址

SITE SELECTION OF WASTE TRANSFER STATION BASED ON NUMERICAL SIMULATIONS OF ODOR DISPERSION

城市垃圾中转站恶臭气体扩散问题是居民非常关注的焦点。采用计算流体力学方法对某拟建垃圾中转站和周围建筑物附近的流场和可能泄漏的恶臭气体的扩散进行了数值模拟,分析了不同风速和风向对流场结构和恶臭气体扩散特性的影响规律。结果表明:在相同风向不同风速下,无因次化流场结构基本相同;风速高时恶臭气体迅速扩散,不影响周围建筑物;接近静风时,恶臭气体能够扩散至垃圾中转站的连体建筑和南侧学生宿舍,但浓度已降低约3个数量级;风速接近静风的东风和南风条件下,恶臭气体扩散快,影响区域有限。总体上,该拟建垃圾中转站的选址合理。该研究过程可为类似项目选址的合理性评判提供科学参考。

Odor dispersion in urban waste transfer stations is the focus of local residents attention.In this study,we numerically simulated the flow fields and odor dispersion around an urban waste transfer station to be constructed,by using computational fluid dynamics methods.The effect of wind speeds and wind directions on the flow and dispersion were investigated in detail.The results showed that normalized flow fields were almost the same,if we changed the wind speeds but kept constant wind direction.Wind speed,however,had great influence on the odor dispersion.The odor dispersed quite quickly at high wind speeds.But the odor dispersed slowly when winds were almost stationary,and it could spread to the building connecting to the waste transfer station and to the southern student accommodation,with the odor concentration three magnitude orders lower than initial one.For east and south wind,we find that the odor dispersed quite quickly,then the affected region was very small.The site selection of the investigated waste station was proved reasonable.