Dust Control And Shelter Effect Of Porous Fence In Open Storage Yard

The control of the intensity of open source particles is an important issue in the field of atmospheric control.First of all,the typical pollutant particles like PM2.5 and PM10 is the most important pollutant particles in the air,which can be suspended in the air for a long time and throw great threat to human health.Therefore,we choose them as the analytic target to control the dust emission.In this paper,the method of dust source strength calculation is proposed by coupling the source strong estimation model of United States Environmental Protection Agency(EPA)and the method of computational fluid dynamics.To estimate the dust emission on the pile surface,a typical pile shape is used as the simulation model and fluid dynamic mode closed by k-? turbulence model is used to predict the characteristics of the air flow over the surface of the pile,and then,we use the dust emission calculated by EPA mode to get the concentration and trajectory of the typical pollutant particles with the PSIC method.The proposed method eliminates the limitations of EPA method in wind direction and material pile shape,and the surface is divided into small pieces.The calculation results of pile surface dust capacity agree with those of EPA mode.Under the condition of four seasons,taking the open single stack of the Tianjin port as an example,the source of respiratory particulate matter is calculated and the dust suppression effect of windproof net and humidification is studied.The results show that the heap up dust is reduced more than 30% and 90% by the dust suppression measures of humidification and windproof net in four seasons,respectively.What's more,the heap up dust is reduced more than 95% by the combined dust suppression measures of humidification and windproof net in four seasons.In addition,when setting up multiple piles,we found that the shelter effect of porous fence is diminished,it shows that the porous fence has the maximum shelter distance.What's more,the paper studies the economic situation of porous fence and humidification,and thus creating a new water-saving measure and two new shapes of porous fences like arched and circular shapes.In a word,the result is right.We believe it has a theoretical guidance importance on the actual project.