Abstract: The phenomenon of spreading of coal dust generated by raw coal unloading operations at the raw coal receiving pit becomes more aggravated, which gives rise to a series of equipment, personal and environment-related problems. In order to thoroughly eliminate the problems at the source, an innovative air and water-actuated spray system is developed by the plant on the basis of the conventional sealing, blocking and discharge technologies. The water mist generated by the combined action of air and water which are in a certain ratio and under a certain pressure can effectively suppress the coal dust spreading over a large area.