Research On Simulation Of Material Dust In Closed Stockyard And Development Of Dust Concentration Prediction Model

With the rapid development of the social economy and the increasing demand for steel,the workload of the raw material plant of the steel mill is also increasing year by year.A large amount of dust will be generated during the processing of the material in the raw material yard,which will cause environmental pollution and face international and domestic With the increasing emphasis on environmental protection,Shanghai Baoshan Iron & Steel first carried out a closed renovation of the original open-air stockyard.Dust will also be generated in the transfer,stacking and unloading of materials in the closed material yard after the transformation.For this kind of dust phenomenon,This paper uses a combination of theoretical analysis,similar experiments,numerical simulation and computer programming to study the dust generation and movement rules in the C-shaped stockyard and the transfer chute in Baosteel’s enclosed raw material yard.According to theoretical analysis,it is concluded that the dust generation mechanism and the force of the material particles in the C-shaped material yard and chute discharge.The comprehensive dusting effect brought about by the collision movement between the two shows that the discharge dust is mainly related to material moisture content,discharge height,discharge volume and material particle size.A similar experimental model of the C-shaped material yard and the chute was established based on the similarity theory.By conducting experiments on the materials collected on site under the conditions of different moisture content,different discharge height,different discharge volume and different material particle size,the dust concentration value is monitored.And perform a fitting analysis of the concentration value to get the dust concentration change rule:(1)The distribution rule of the dust concentration of the same material in the C-type yard and the chute is the same,but the overall concentration in the chute is greater than the closed yard;(2)Dust The concentration decreases with the increase of the material moisture content.When the moisture content is close to the critical moisture content,the changing trend of the dust concentration becomes slower;(3)The dust concentration increases with the increase of the discharge height;(4)The dust concentration and discharge The quality are positively correlated.Both the increase in the discharge volume and the continuous discharge have caused the increase in the total dust production;(5)The smaller the particle size of the material,the greater the dust concentration;(6)The dust concentration in the C-type material yard and the chute space is automatically It gradually decreases from bottom to top.Because the dust diffusion process in the space is very complicated,this paper uses the DPM model in the FLUENT software to simulate the discharge experiment of different types of materials in the C-shaped yard and chute.Through the analysis of the concentration distribution cloud diagram and the dust particle movement diagram,it is more intuitive To understand the distribution law of dust particles in its interior,provide a reference for the arrangement of dust collection and sprinkling points.In this paper,Python programming language is also used to write programs to predict the dust concentration of materials in the closed yard under different moisture content and unloading height,visualize it and package it into an application program,which can be used by the factory in actual production to provide guidance for sprinkling raw materials.Through the research of this paper,it provides academic help.Technical support for the dust management of the closed stockyard unloading process radically reduces dust generation in the closed stockyard.It provides theoretical support for realizing uncrewed operations in the closed stockyard.