Rotary Vacuum Dryer
A double cone type rotary vacuum dryer provided with a double wall structure
, between whose double walls a heating medium flows to dry the contents, has been conventionally used as a dryer of bulk materials. However, this type of rotary
vacuum dryer only serves for the drying operation and it has no mixing function (the term "mixing" used here implies the technologies for blending different types of bulk material, for coating on particles, and for granulation). It merely rotates the drying chamber to conduct drying. The pre-mixed bulk materials or liquids to be dried enter through a charge/discharge opening in the side wall of the drying chamber, and the dried products are discharged through the same opening.
A rotary dryer for drying and mixing particulate material, includes a shell having a pair of conical portions and provided with a jacket to which a hot fluid may be fed, the shell defining a chamber for the material to be dried and mixed. An air-tight closure for the chamber is provided with a jacket to which hot fluid may be fed and through which the material is charged and discharged. A rotary tube shaft extends horizontally from one end of the shell and along the horizontal axis of the shell, the rotary tube shaft being sheathed by a rotary joint pipe equipped with a bearing rotatably supporting the rotary tube shaft. The rotary tube shaft is provided with a plurality of communication paths which communicate with charge/discharge ports located on the rotary joint pipe during rotation of the rotary tube shaft in the rotary joint pipe, the communication paths connecting the jackets of the shell and the closure for feeding the hot fluid. An air nozzle is disposed along the internal wall of the shell and a stirrer including a rotational mixing blade are located within the shell to agitate the material, the stirrer being supported by the wall of the shell. A feeder pipe is air-tightly inserted in the rotary tube shaft, sheathing and evacuating pipe to communicate with a
vacuum dryer line and an air supply pipe connected to said air nozzle.
The present invention has been made to cope with the aforesaid disadvantages, and the object of this invention is to present a rotary
vacuum dryer which performs vacuum drying of bulk materials, preventing them from sticking to the inner wall surface, and which yields stable high quality products by low temperature vacuum drying without any thermal decomposition or any thermal degradation.
by: ericfu
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