Key technology of dust source tracking spraying dust reduction in fully mechanized mining face
To improve the dust capturing and settling efficiency of the large mining height working face in the coal mine,we analyzed the influencing factors of the dust reduction efficiency,tested the nozzle atomization parameters with the laser fog diameter testing platform,flow monitoring device and multi-spectral laser particle size analyzer,and we developed the dust source tracking spray reduction system to realize the"three-dimensional"tracking spray reduction of the cutting drum of the shearer.The results of the study show that:the dust reduction efficiency of spraying in the large mining height mining face is related to the parameters of nozzle water consumption,spraying coverage area and droplet size,and the dust reduction efficiency formula is established accordingly;the wind speed has an important influence on the dust reduction efficiency of the nozzle atomization,and as the wind speed increase lead to a decrease of dust reduction efficiency of each nozzle;according to the calculation results of the dust reduction efficiency under the different wind speeds,the preferred nozzle is SS1507.A dust source tracking spraying system with flow control function was developed to realize the controllable tracking spraying dust reduction and reduce the water consumption;and it was applied on site in the 85219 large mining height mining face in Sandaogou Coal Mine,and the total and respiratory dust reduction efficiencies were 91.15%and 81.96%at the upper drum position,and those were 90.61%and 83.54%at the lower drum position,the dust concentration was significantly reduced.
large mining height mining facedust pollutiondust source trackingspray dust suppression
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