A non-parametric bubble size correlation for a Two-Section Two-Zone Fluidized Bed Reactor (TS-TZFBR)

作者：Julian I; Herguido J; Menendez M^*

来源：Powder Technology, 2014, 256: 146-157.

DOI：10.1016/j.powtec.2014.02.004

• Bubble size correlation
• Bubble measuring technique
• Tapered fluidized bed
• Redox reactor

The Two-Zone Fluidized Bed Reactor (TZFBR) provides a high level of process integration, allowing heterogeneous catalytic reaction and simultaneous catalyst regeneration in two different zones of a single fluidized bed. This work considers a new reactor design that incorporates a different cross-sectional area in each zone to allow low flow rates in the regeneration zone. The reactor geometry, e.g. the transition angle a between the two zones in this Two-Section Two-Zone Fluidized Bed Reactor (TS-TZFBR), has a strong effect on the bubbling behavior. The present study focuses on obtaining a bubble size (d(b)) correlation able to predict the experimental hydrodynamic behavior inside this novel TS-TZFBR Experimental studies have been conducted on acrylic glass pseudo-2D TS-TZFBRs using several particle types and reactor geometries (alpha). Experimental results validate classical db correlations within the straight region of the reactor. A novel non-parametric bubble size correlation has been developed to predict the bubbling behavior within the tapered bed section, where an additional gas feed is also applied. This non-parametric model agrees with experimental results along the whole TS-TZFBR bed height for a wide range of operational conditions: U-gas/U-mf = 1.5-3.5, U-gas-U-mf = 5-25 cm/s, alpha = 0 degrees-85 degrees, U-mf = 1.2-20.5 cm/s.

• 出版日期2014-4