Experiment research of the coupling relationship between dust field and droplet field about fully mechanized and roof caving workface

Abstract

In order to obtain the quantitative relationship between droplet field and captured dust field in fully mechanized and roof caving workface,on the condition of utilizing the experimental device which simulated the actual wind velocity of fully mechanized caving face,experimental platform which was made up of water supply system,air supply system,particle measuring system,pressure test system,dust measuring system and dust releasing system were designed and manufactured to couple the relationship between dust field and droplet field.By dynamic three-dimensional laser Doppler particle analyzer,coupling experiment of dust-droplet field was carried out on 6 types of pressure nozzle,including direct-injection nozzle,single-type centrifugal nozzle,mixed-type centrifugal nozzle,which are commonly used in coal mine.Through measuring the droplet size before and after dust released when fan on,the quantitative function expressions between the average particle diameters of droplet without dust and the diameters of captured dust were fitted in three intervals[40,65],[65,100],[100,160]μm by using the method of numerical analysis of Matlab.Furthermore,the optimum droplet size to capture respirable dust was also fixed on [15,75]μm,therefore,the theory of dust prevention by water-cloud was improved and completed.