Abstract: In order to solve the problem of dust pollution in the crushing and screening workshop of a mine,the nozzle atomization dust reduction experiment was designed according to the nozzle atomization theory,and the ultrasonic atomization dust reduction technology was applied in the mine crushing and screening workshop according to the experimental results.The experimental and application results show that the geometric structure of the ultrasonic atomization generator's liquid atomization device,the gasassisted atomization device and the mist beam former affect the atomization parameters and flow characteristics of the spray,the liquid atomizer and the gasassisted atomization device Affects the initial breaking and atomization of liquids,and the mist beam former affects the secondary breaking of droplets and constraining the liquid beam shape;the gasliquid ratio of the ultrasonic atomization generator has a power function relationship with the gasliquid pressure ratio,and the power exponent is -1.09;The smaller the particle size of the droplets,the higher the dust reduction efficiency of the droplets.When the droplet D50 is 23 μm,the dust reduction efficiency of the droplets is above 94%;the vibration sieve feeding belt and the upper sieve belt of the mine crushing and screening workshop are used to receive materials.The ultrasonic atomization generator is arranged at a point.After the ultrasonic atomization generator is turned on,the dust concentration in the workshop is reduced to 5.86~10.54 mg/m3,and the dust reduction efficiency is above 71.38%.

Key words: nozzle geometry,gasliquid ratio,droplet size,dust reduction efficiency