Flow of a moderately cohesive FCC catalyst in two pilot-scale rotary calciners: Residence time distribution and bed depth measurements with and without dams

Chen, Isaiah Y.; Navodia, Sahil Suleman; Yohannes, Bereket; Nordeck, Lauren; Machado, Brent; Ardalani, Elaheh; Borghard, William G.; Glasser, Benjamin J.; Cuitiño, Alberto M.

doi:10.1016/j.ces.2020.116211

Cited by 5 publications

(2 citation statements)

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“…A narrower distribution is obtained due to higher rotation speed. Other researchers have also shown that narrower RTD are obtained when rotation speed increases [5,7,10,24,[31][32][33]. Figure 5e shows the effect of the incline angle on the RTD.…”

Section: Resultsmentioning

confidence: 70%

“…It should be noted that the axial dispersion coefficient shows random displacement of particles [10]. Generally, other studies showed that axial dispersion coefficient increases with rotation speed for cohesive powder and catalyst [7,31], spherical particles [10,11,34], cylindrical particles [10,10,36], cuboid particles [33] and cubic particles [16]. Reviewing the captured movies in the experiments revealed that a change in flow behavior occurs at 9 rpm when the incline angle is 3 • and 4 • and the bed flow behavior is similar to slumping regime.…”

Section: Effect Of Rotation Speedmentioning

confidence: 94%

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Residence Time Distribution of Non-Spherical Particles in a Continuous Rotary Drum

et al. 2022

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The motion of non-spherical particles with sharp edges, as they are commonly involved in practice, was characterized by residence time distribution (RTD) measurement in a continuous drum. Particles with two sizes, 6 and 10 mm, and two densities, 750 and 2085 kg/m3, were used in the experiments. The effects of rotation speed (3–11 rpm), incline angle (2–4°), feed rate, and mixture composition were investigated and compared to the results of other researchers on particles without sharp edges. We also fitted the RTD with an axial dispersion model to obtain a better insight into the flow behavior. MRT of non-spherical particles with sharp edges depends on ω−α similar to other shapes, while the value of alpha is higher for particles with sharp edges (0.9 < α < 1.24), especially at high incline angles. The MRT depends on incline angle, β−b, where b varies between 0.81 (at low ω) and 1.34 (at high ω), while it is close to 1 for other shapes. Feed rate has a slight effect on the MRT of particles with sharp edges and the effect of particle size diminishes when rotation speed increases. The MRT linearly increases with volume fraction of light particles in a mixture of light and heavy particles (from pure heavy to pure light particles).

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