| Mine dust is one of the major hazard in the coal mine, which is serious harmfulto the miners working in whole-rock heading face. The dispersion and silica contentof rock dust is much higher than coal dust, so rock dust is a dangerous factor causingthe pneumoconiosis. Based on the current results, the author applied the foam anddust exhausting fan dedusting technology in South wing belt-690transport tunnel inDong Huan Tuo coal mine of Kai Luan Coal Group Ltd, and analyzed the law of dustdispersion and dedusting effects in heading face of whole rock roadway.The simulated results show that the dedusting effects is better with the absorbingairduct located in the wind return side of roadway than with the absorbing airductlocated in the middle of roadway, and it decreases with the distance L between theabsorbing airduct and the heading face. The dedusting effects is the best whenL=2.0m with the absorbing airduct located in the wind return side of roadway, withthe dust removal fan working, the average dust concentration near the heading facecould reduce to365mg/m3from1150mg/m3, the decreasing range reachs68%. Theaverage dust concentration in the whole50m tunnel reduces to268mg/m3from578mg/m3, the average dust removal rate could be75.88%, which significantlyimproved the environment of a heading face. The foam and dust exhausting fandedusting technology was applied in South wing belt-690transport tunnel in DongHuan Tuo coal mine, which had got good effects: around the driver, all the dustconcentration was265.3mg/m3and the respirable dust concentration was118.6mg/m3, the average dust removal rate could be75.38%and79.34%. The measureddata agree well with the simulated data.A way of visually understanding dust movement process is given, which couldprovide us a deeper understanding of the airflow, dust movement process anddedusting effects. The results would be helpful to us to develop dedusting measures inheading face. |
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