The Research Of Evaluation And Prevention Method Of Wind Erosion Of Coal Storage Yard In Tianjin Port

In recent years,with the aggravation of the air pollution,especially the great harm to the human body’s respiratory system by the PM2.5,pollution of the particulate matter in the city has been paid attention to by the researchers.Tianjin as the North’s largest port city undertakes the storage and transport function of bulk goods in large quantity.Every year a lot of damage and serious air pollution will happen because of wind erosion.It shows that the dust has accounted for more than 42% of total suspended particulate matter(TSP)in Tianjin.So to study the mechanism and develop effective measures to deal with the problem is an urgent need.This paper focus on the issue of the calculation method and prevention skills of the dust in coal yard at Tianjin port.First of all,starting from the mechanism of dust emission,this paper introduces the necessary conditions for dust particles injection by fluid mechanics.Then it introduced the domestic and foreign scholars’ research of dry bulk dust’s injection conditions and factors which affect the quantity of the injection in the natural wind in the yard.Based on the relevant research results,some questions are put forward to the calculation formula of wind erosion dust in the yard,which is given in the "code for environmental impact assessment of port construction project".Secondly,with the help of MATLAB software,for solving the dust injection problem of Tianjin Coal Yard Co.Ltd,according to the calculation formula given by the "code for environmental impact assessment of port construction project",dust emission calculation model in the coal yard is established.And a creative method for simulation of wind speed is introduced in the calculation model.The autoregressive model is introduced into the MATLAB dust emission calculation model.And the "standard" formula obtained correction parameter ?.Finally,this paper discusses the feasibility of using closed yard instead of open-air yard.With the improvement of people’s environmental awareness,more and more closed storage bunker was built.The closed yard and open-air yard are compared and analyzed from the aspect of environment compatibility,economy and security.