Circulating fluidized bed dryer applying drying medium

Abstract

The invention discloses a circulating fluidized bed dryer applying a drying medium, and the dryer comprises a dryer body; a drying medium hopper is arranged at the bottom of the dryer body, the dryingmedium is placed in the drying medium hopper, the bottom of the drying medium hopper is connected with a fluidization air pipe, and a material inlet pipe is also arranged at the top in the dryer body. According to the invention, the solid drying medium is added into the fluidized bed, the medium is in a fluidized state by using fluidized air, and the heat cost is saved due to the increased energystorage effect caused by the addition of the drying medium; a liquid substance needing to be dried is introduced into the fluidization movement in a spraying mode; on the one hand, the liquid material can be dried and separated in the self-fluidization process; on the other hand, when the liquid material makes contact with the surface of a medium, due to the larger surface heat transfer coefficient and the larger contact area of the liquid material, the liquid material more easily absorbs heat from the liquid material; therefore, the drying process is greatly accelerated.

Description

technical field [0001] The invention relates to the related technical field of fluidized drying, in particular to a circulating fluidized bed dryer using a drying medium. Background technique [0002] Fluidization technology started as early as 1921. Fluidized drying is a process in which materials undergo convective and radiative heat exchange through fluidized wind during the process of boiling and fluidizing materials in a fluidized bed, thereby evaporating and taking away excess water for drying. Since the invention of fluidization technology, drying is one of the earliest fields of application. [0003] Fluidized drying mainly has the following advantages: (1) The material in the fluidized state is continuously and violently stirred in the bed, so the heat transfer effect is good; (3) It is convenient to start and stop operation (4) The fluidization rate can be adjusted to differentiate the discharge time; (5) The fluidization itself has no mechanical moving device ...

AI Technical Summary

Problems solved by technology

[0004] When the existing fluidized dryer is drying the liquid material, the liquid material is heated through the dryer, supplemented by stirring, so that the material is heated by slow heat transfer, and the water contained in it is evaporated. If the time is long, the mixing efficiency will gradually decrease with the increase of the evaporation concentration of the material, and there will be uniformity problems.

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