At present, we cannot get the nozzle droplet size by calculation, but we can get a relatively accurate nozzle droplet size through experimental measurement. The measurement methods include liquid immersion method, laser measurement method, etc. Our company has the world’s advanced laser refraction particle size tester, which can accurately measure the diameter of the droplets, which is very important for spray dust removal, because if the droplet diameter is too small , They will not be able to coalesce with dust particles and shoot down the dust. If the diameter of the droplets is too large, they will not be able to effectively shoot down the dust. Our experiments show that when the diameter of the droplets is 1 to 5 times the diameter of the dust particles, the best dust suppression effect can be achieved.