| 摘要 |
PURPOSE:To eliminate the resticking between particles or the scorching of raw material and to obtain the treated product of stable uniformity by providing the dispersing part of specified structure to a raw material supply part and allowing to combine methods of rotary drying, pneumatic conveying drying, and spray drying. CONSTITUTION:Multiple tubes are so disposed and fixed that a raw material supplied from a dispersing part 8 of one end of an inner tube 4 is returned at the other end of the inner tube 4 to flow into a middle tube 3, and returned similarly into an outer tube 2 in order. The raw material, such as a wet material, supplied to the dispersing part 8 is uniformly dispersed in the hot gas flow introduced from a treating gas introducing tube 9 provided in the coaxial direction by the revolution of plural dispersing plates 7 disposed radially. Firstly, the raw material is scraped up by scraping-up plates 5 in the inner tube 4 and receives hot air of high velocity and high temp., so that the water contained in the surface of the raw material is instantly evaporated. Then the raw material is sent to the middle tube 3 and to the outer tube 2 in order, and is dried to the inner part during a long resident time while being scraped up. |
