Steel plants usually allocate large open space to stockpile enough raw materials, such as coal, for metallurgical Equipment including blast Furnaces, sintering, coke ovens and etc. However, the space is easy to cause airborne dust. Therefore, we developed a dust-control system, by which the dust collection rate proves 90%, to add moisture to stockpiles to prevent dust. Nozzles produce drops to collide with dust particles that are already airborne