Investigating the eruptions of fine−grain material from a nonuniform fluidized bed

✍ Scribed by A.P. Baskakov; V.Yu Shuvalov; B.V. Berg

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 547 KB
• Volume: 39
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(84)80038-x

✦ Synopsis

A model is proposed for the entrainment of particles from the surface of a fluidized bed. It is shown that the deep voids produced by coalescence. of two or rare bubbles near the surface serve as the source of the powerful eruptions of particles. A qualitative analysis of the influence of the main bed parameters on the maximum entrainment height of the particles is piven.

The gas flux across the elongated ellipsoidal voids at the bed surface was investigated when the superficial gas velocity was equal to We, and 0.5w,,

The analytical solution for the gas flow through the ellipsoidal void when the Reynolds number is small was derived and an empirical correlation is given for M@MX gas velocities when the gas flow through the particulate phase is not potential.

An empirical correlation for prediction of the maximum entrainment height was obtained. This includes a dependence on diameter and height of the bed, fluidization velocity and diameter of the particles.