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Circulating fluidized bed hydrodynamics with air staging: an experimental study |
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| Authors: | LE Ersoy M Koksal |
| Affiliation: | a SNC Lavalin, Montreal, QE, Canada b Department of Applied Physics and Electronics, Umea University, Umeå, Sweden c Department of Mechanical Engineering, Dalhousie University, Halifax, NS, Canada d Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive Ottawa, Ontario, Canada K1S 5B6 |
| Abstract: | The influence of secondary air injection (SA) on the hydrodynamics of circulating fluidized beds was studied in a 0.23-m ID riser. The secondary to primary air ratio, the vertical position, and the mode of injection (radial, tangential, and 45° entrance) are considered to be the key parameters of SA injection. It was found that the amount and location of SA have direct influence on the solids holdup and the segregation patterns in the riser. The SA divided the riser into two different flow zones: a dense turbulent zone below and a relatively dilute bed above the injection port. The mean solids velocity is found to be upwards with a greater magnitude in the center region. It is downwards with a smaller magnitude along the walls, suggesting core-annular flow structures for both above and below the SA injection region. |
| Keywords: | Circulating fluidized beds Secondary air injection Particle velocity Hydrodynamics |
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