气水喷雾在多种城市雾霾下的应用实验

Application of Air-water Spray Under Various Urban Haze Conditions

为了研究气水喷雾的除雾霾效率和除雾霾机理,首先人工模拟了中度污染级、重度污染级和严重污染级等典型雾霾,以及机动车排放、海洋气溶胶、工地扬尘和燃煤发电厂等污染源产生的城市雾霾等环境,然后基于自行设计并搭建的气水喷雾除雾霾系统,针对上述人工环境进行雾霾沉降实验.研究结果发现:气水喷雾对人工雾霾具有显著的沉降作用,对各污染级雾霾的除霾效率均在65%左右,而且随着雾霾浓度的增大,气水喷雾对雾霾的沉降效率越高;气水喷雾的除霾效率受颗粒物的润湿性影响较大,当颗粒物润湿性增大时,除霾效率越高;气水喷雾的除霾效率也受微观形貌和密度影响,对于微观形貌越不规则,密度越大的颗粒物除霾效率越高.这为今后城市雾霾的治理提供了一种新的治理手段,同时也为城市空气净化提供新的思路和方法.

The main purpose was to study the efficiency and mechanism of haze mitigating by air-water spray.First,artificial haze such as moderate pollution level,heavy pollution level and severe pollution level,as well as urban haze caused by pollution sources such as motor vehicle emissions,marine aerosols,site dust and coal-fired power plants,were artificially simulated. Then,based on the self-designed and built gas-water spray defogging system,the haze sedimentation experiment was carried out for the above artificial environment. The results show that air-water spray has significant sedimentation effect on artificial haze,and the efficiency of haze mitigating for all pollution-level haze is about 65%. Moreover,as the concentration of haze increases,the sedimentation efficiency of the haze by the gas-water spray is higher. The efficiency of haze mitigating of air-water spray is greatly affected by the wettability of the particulate matter. When the wettability of the particulate matter is increased,the efficiency of haze mitigating of air-water spray is higher,so the greater the wettability,the higher the efficiency of haze mitigating. The efficiency of haze mitigating of air-water spray is also affected by the micro-morphology and density. The more irregular the microscopic morphology,the higher the density of the particles,the higher the efficiency of removing the particles. A new means of governance is provided for the future management of urban haze,and new ideas and methods are also provided for urban air purification.