摘要
通过试验验证了细微颗粒存在较强的浓度梯度扩散现象,及净化设备向污染空气的相对运动可以更快速净化污染空气。首先在实验室中通过发烟模拟重度雾霾环境,净化装置由金属丝网和特殊极线按常规电除尘器的布置方式组成。装置固定时,房间颗粒物浓度降至50%时,约需2.8 min,而降至20%以及恢复到发烟前初始状态,则分别需要约8 min和16 min。装置移动时,房间颗粒物浓度降至50%时,约需20 s;距离净化装置1,3,6 m处的浓度测量值很接近,浓度梯度在实验工况最大为15μg/(m^3·m)。距离净化装置1,3,6 m^3个位置中,1 m处颗粒迁移速度最大,从约0.02 m/s增大到约0.07 m/s。户外实验净化装置由RS芒刺线和铁丝网简易拼凑而成,在距离其3 m位置,雾霾浓度双向平均可降低约25.5%。
A method for purifying polluted air in large open space was proposed and verified,based on concentration gradient diffusion theory and relative motion principle of purification equipment to the polluted air. In the indoor experiment,severe haze environment was simulated by fuming,and the purification equipment is of metal wire and gauze. When the equipment is fixed,to reduce the concentration of the particulate matter（ PM） in the laboratory to 50% of the original value,2. 8 minutes is needed,while to 20% of the original level,8 and 16 minutes are needed,respectively. When the equipment is moved,only 20 seconds is needed to reduce the concentration to 50%. In outdoor experiment, a 25. 5% cut down of haze concentration is reached.
出处
《环境工程》
CAS
CSCD
北大核心
2015年第12期75-79,83,共6页
Environmental Engineering
关键词
浓度梯度
扩散
相对运动
除霾
concentration gradient
diffusion
relative motion
haze removal
