Research On Wind Flow And Dust Migration Law In Fully Mechanized Mining Face With Large Mining Height

With the speedy innovation of thoroughly mechanized mining technological know-how in latest years,extra and extra coal mines select giant mining top entirely mechanized mining.Due to the giant diameter of the shearer drum in the totally mechanized mining face with massive mining height,the quantity of slicing dirt is additionally a great deal greater than that in the normal mining top,and the existence of various large-scale equipment makes the variation law of air flow distribution complex.The dust concentration distribution in different heights and regions in the working face space is also different.Dust will cause serious harm to the health of miners and the safe mining of coal mines.It can be seen that studying and determining the variation trend of dust concentration distribution in fully mechanized mining face can help to find key dust-proof areas and provide a theoretical basis for reducing dust hazards.Based on the theories of gas-solid two-phase waft and dirt properties,this paper research the migration and distribution regulation of flour dirt in wholly mechanized mining with massive mining peak via the aggregate of area measurement,theoretical research,comparable test and numerical simulation.The principal lookup contents and outcomes are as follows:Firstly,via discipline observation,the parameters such as dirt manufacturing capacity,dirt dispersion and awareness of dirt samples in totally mechanized mining face are measured.Based on the evaluation and calculation effects of measured data,the mannequin boundary conditions,discrete segment and non-stop segment parameters are decided,which establishes a foundation for building a similar experimental platform in fully mechanized mining face and simulating the dust migration and diffusion law in the whole fully mechanized mining face space.Secondly,based totally on the similarity principle and associated expertise of hydrodynamics,the similarity criteria that need to be met in the similarity experiment of fully mechanized mining face are obtained,and a 1:5 large-scale similarity simulation experiment system of fully mechanized mining face is designed and built.According to the actual size of the test-bed,the contents and specific experimental steps of similar experiments are designed.Through relevant experiments,the air go with the flow distribution regulation in the roadway of absolutely mechanized mining face and the dirt awareness distribution of exceptional particle sizes alongside the roadway below exclusive wind speeds are obtained.Finally,the numerical simulation is carried out to find out about the air drift distribution in the entirely mechanized mining face with giant mining top,the distribution law of dust mass concentration cut by shearer and the main influencing factors when the wind speed is 2.0m/s.By adjusting parameters,the consequences of extraordinary wind speeds on dirt mass attention and air drift distribution in respiratory region and the distribution regulation of multi dirt supply dirt in wholly mechanized mining face are simulated.According to the lookup results,the alternate and distribution of air glide in the thoroughly mechanized mining face with giant mining peak are for sure affected with the aid of the limitations in the working face.Within the scope of regulations,the higher the wind speed is,the more conducive it is to reduce the dust concentration of working flour.However,immoderate wind pace is effortless to reason secondary dust.It is concluded that the top of the line air flow wind velocity of 6m excessive mining face is about 2.0 m/s.Therefore,the wind speed setting of the working face of the mine is reasonable.