Fluidized regimes spouted beds

Not all beds are spoutable. For beds with the ratio of nozzle diameter to column diameter D JD, above a certain critical value, there is no spouting regime. The bed transfers from the fixed bed directly into the fluidized state with increasing gas velocity. To achieve a stable nonpulsating spouted bed, the nozzle-to-parti-cle-diameter ratio, DJd, should be less than 25 or 30. There are also the so-called minimum spouting... 

Mixed plastics automobile shredded 3 wt% chlorine Energy and Environmental Research Corporation and US EPA, pilot scale, spouted bed fluidized regime ablative gasification, 500-800°C Fe203 active gasification catalyst and sorbent for HCl Petrochemical feedstocks 381b... 

Fig. 10.2 Flow regime map of gas-soUd contacting, a Characteristics of turbulent flow regime, b Characteristics of spouted beds, bubbling fluidized beds, fast fluidized beds and pneumatic transport regimes. In the figure notation the ordinate u = U p / n(pp — pg)g) is a dimensionless gas velocity, the abscissa d = dp[pg pp — Pg)glp ] a dimensionless particle size, the terminal velocity of a particle falling through the gas (m/s), and Umf the gas velocity at minimum fluidization (m/s). Letters A, B, C and D refer to the Geldart classification of solid particles. Reprinted from [49] with permission from Elsevier...

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