Research and development on atomizer of air atomized drilling in soft seam of underground mine

According to seious dustpoltion at the mouth of the borehole during the air riling operation,wth theair and water linkage valve in the practices water could be drecty injected into the borehole to controlthe dust and the atomized water quantity and atomized fovw paramneters could not be acuraely contrlled and ?djusted.Thus the dust controleffect was poor.Due to the coal powder was too wet.the dificult dust dicharging caused a.dent and othe problem occured in the borhole. with the caloulation,fnite element analysis and matching selection as well as other method.,the atomized fow.atomized pressure,nuze diameter and other key paramelers of the atomizer could be caleulated and determined. The pneumatic motor atomized pump and other key components were optimized and the atonized mivedchamber was designed.A sprayer special for theair atomized driling in sot sean of the underground mine was researched and developed.the max atomized ressureof the sprayer could be 10 MPa,the atomized flow could be 4 L/ min and the atomized parameters could be controled and adjused. Theste applcaion showed tht aer the appication of the atomizer.the site dust concentation could be reduced over 94% WNhen the good dust control effct was kept.,the adonized cuanit wouda be inreased with the depth of the borehole increased and would be in a lnear relaton roughty When the depth of the borehole was at abou 200 m,he max atomized quantiy woud be83.5 L / min and there was no high temperature ocured inthe borehole during the borehaole drling. Tnus the sprayer could meet the requirements of the airatomized drilling in the soft seam of the underground mine.