page_title: Annular fluidized bed
section_title: Influence of gas velocity in the annular fluidized bed
hierarchical_section_title: Annular fluidized bed / Process characteristics / Influence of gas velocity in the annular fluidized bed
caption_attribution_description: English: blablh
context_page_description: Fluidisation is a phenomenon whereby solid particulate is placed under certain conditions to cause it to behave like a fluid. A fluidized bed is a system conceived to facilitate the fluidisation. Fluidized beds have a wide range of applications including but not limited to: assisting with chemical reactions, heat transfer, mixing and drying. A recent concept devised and patented by Outotec, "An annular fluidized bed consists of a large central nozzle surrounded be a stationary fluidized".
context_section_description: Bubbling occurs in the annular fluidized bed caused by the introduction of gas by the central nozzle at a certain velocity moves in the general upwards direction. The sudden eruption of gas at the central nozzle causes particles to be transport in the bubbles wake By increasing the velocity of the annulus results in an increase in the bubble size and the bubbling velocity. The new increase in bubble dynamics enables  “the ejected solids to penetrate deeper into the central gas jet”. As a result of this, the concentration and velocity of solids increases and consequently the solid optimum mass flux increases.
caption: Influence of gas velocity in the Annular Fluidized Bed
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