After filtration and heating, the air enters the air distributor at the top of the dryer, and the hot air gets into the drying chamber in a spiral evenly. The material liquid is sprayed into the fine mist of the liquid through the high speed centrifugal atomizer or the high pressure atomizer at the top of the tower, and it can get dried as final product in a very short contact time. The final product discharge continuously from the bottom of the dryer tower and cyclone separator. The fine powder is collected by the pulse bag-type dust remover, and the exhaust gas is discharged through the fan.