Fluidization of cryogels in a conical column

Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop

“…Carbon-white and saponite particles are observed to circulate continuously in a conical uidized bed, moving upward from the bottom center to the top, and then fall down along the bed wall, as was reported by Venkatesh et al (1996) for cryogel. For CaCO 3 and TiO 2 , however, the entire uidized bed appears in a bubbling state without obvious particle circulation.…”

“…Venkatesh et al (1996) studied the uidizability of NiO/Al 2 O 3 cryogel in a cylindrical uidized bed, showing the formation of 1-5 mm agglomerates, decreasing in size with bed height. In order to uidize simultaneously both the large agglomerates at the bottom and the small agglomerates at the top, a conical bed was designed to provide a gradually decreasing gas velocity along the bed height.…”

Minimum Fluidization Velocity of a Three-Phase Conical Fluidized Bed in Comparison to a Cylindrical Fluidized Bed

“…Several studies have attempted to predict the minimum fluidization velocity of both gas−solid and liquid−solid tapered fluidized beds by incorporating the conical geometry into the minimum fluidization velocity equation, which was originally derived for cylindrical fluidized beds. ,– However, little work has been done on the gas−liquid−solid three-phase tapered beds. The objective of this research was to study the hydrodynamic characteristics of a conical fluidized bed operated with both liquid and gas−liquid as the fluidizing medium.…”

The influence of vessel geometry on fluidized bed dryer hydrodynamics

“…The most relevant work related to the benefits of the conical geometry operated with cohesive material was done by the group of Chaouki [23]. They improved the fluidity of NiO/Al 2 O 3 cryogels, which are Geldart C powders, using a conical bed.…”