A method of prediction of the porosities of high‐pressure gaseous fluidization systems

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Abstract
The porosity of a fluidized bed at any superficial velocity may be calculated by Richardson and Zaki's method if the terminal velocity of a representative particle is known. This terminal velocity can be calculated under any operating conditions by Beranek's atmospheric elutriation criterion.Porosities were measured at 331 superficial velocities in fluidized beds of cracking catalyst, using hydrogen, nitrogen and argon at pressures of 300 to 800 p.s.i.g. as the fluidizing media. It was postulated that the “largest significant particle” was representative for beds fluidized with high‐pressure gases such as these.The porosities at these same velocities were calculated using Beranek terminal velocities of the “largest significant particles” in Richardson plots. A 16.6% standard deviation was found in the values of the calculated porosities when compared with the measured values.

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