Abstract: The underground excavation face has the characteristics of concentrated production equipment,large amount of dust production and complex wind flow field,which seriously threatens the safety of the mine production and the occupational health of the miners.At present,the widely used dry-type dust collection method has a high purification efficiency for dust,es pecially for respirable dust.However,issues such as high operating resistance and poor dust extraction efficiency exist during its usage.To this end,the KCG-800 dry-type dust collection system was designed for the W3306 auxiliary transportation along the groove of the high-gas excavation roadway of Shanxi Gaohe Energy Co.,Ltd.and the combination of positive and negative pres sure air ducts was used to regulate the flow of dust-containing air in the roadway.The positive pressure air duct and the nega tive pressure air duct were set up 4 m and 3 m away from the head of the excavation face respectively.And a round table shaped dust collection cover was selected to be set at the entrance of the negative pressure air duct.The field application results show that the average dust removal efficiency of the total dust and respirable dust at the position of the roadheader driver is 97.67% and 95.99%,respectively.The average dust removal efficiency of the total dust and respirable dust at the transfer point is 96.88% and 93.71%,respectively.And the average dust removal efficiency of the total dust and respirable dust at the outlet position of the fan is 96.26% and 98.62%,respectively.There is no obvious dust drifting phenomenon behind the road way.In addition,before and after the dust removal system was turned on,the gas concentration at the three measuring points on the site remains almost unchanged.And there was no gas accumulation,which proves the safety of the mine dry-type dust col lection system in the high-gas contained roadway.

Key words: dry-typedust collectionmethod,excavationworking face,high-gascontainedroadway,positiveandnegative pressureairducts,dust removal efficiency