A Study on Dust-Control Technology Used for Large Mining Heights Based on the Optimization Design of a Tracking Spray Nozzle

Intense cutting-induced dust production in fully mechanized mining faces (FMMFs) with large heights produces a high amount of that is difficult to capture and severely affects the working environment, threatening health occupational staff. The effective spray range atomization performance tracking sprays are counteracted by influences mine’s height ventilation airflow FMMFs. Thus, optimizing spray’s parameters relationship between reduce levels main priority dust-control techniques. In this study, new swirl-core nozzle developed based on fluid mechanics solid–liquid coalescence mechanism. liquid generates circumferential velocity when passing through swirl core, which considerably increases droplet breaking power reduces cohesion factor, achieving remarkable effect. angle 57°, 80.9% greater than GZPW-16 mine-use (31.5°); from 5.2 5.9 m; mist saturation significantly better nozzle. Under different test pressures, particle size droplets produced particles site satisfied best synergy droplet–dust coalescence. total respirable dust-reduction rates were 78% 75.1%, respectively, 42% 65% higher those original effectively improves efficiency single technique spray, significant for dust-prevention -control technology FMMFs heights.