Operation of the fluidized bed dryer
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I would appreciate it if an expert could explain the design, selection, and operation of fluidized bed dryers. In our material, 30% is powder (with a specific gravity of 0.5) and 70% are particles, and dead bed accumulation often occurs.
It is recommended that you contact professional drying manufacturers!
A large difference in particle size is detrimental to the operation of a fluidized bed. If this is not the cause, it is recommended to adjust the wind speed in each chamber to make it as uniform as possible; adding agitation in areas where deposition is likely to occur is also effective. Controlling the moisture content of the feed is also a solution; for example, returning some of the dry material. In short, comprehensive adjustments based on multiple factors are necessary. Willing to discuss via email: dcyang01@sina.com
OP, is yours a static fluidized bed? If the fineness of particles and powder differs significantly, their settling speeds will also differ greatly. The operating gas velocity in a fluidized bed should be equal to the settling speed of the particles, so that the material can remain suspended in the air for drying; once drying is complete, the particles become lighter and then leave the drying chamber. The problem of increased gas velocity causing material accumulation can be solved, but the fine powder enters the exhaust gases before it dries. Static bubbling beds are not suitable for materials with uneven particle sizes, and the plate pore structure also plays a role; a good structure can accommodate a wider range of particle sizes. In general, the plate pore structure needs to be designed after specific calculations based on the properties of the material. A vibrating fluidized bed would be better suited for your situation. If you can’t solve it, feel free to contact me; my contact information is on my personal page
I don’t quite understand dry beds well. Could you provide some detailed information?