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The gas-solid flow characteristics in the riser of a high density CFB of square (0.27 m×0.27 m×10.4 m) or circu-lar (? 0.187m×10.4 m) cross section, using Geldart B particles (quartz sand), was investigated experimentally. The influence of riser structure on the hydrodynamic behaviors of a high-density circulating fluidized bed was investigated. The solid circulation rate was up to 321 kg/(m2s) with the circular cross-section under the operating conditions of the main bed air velocity 12.1 m/s and loosen wind and back-feed wind flow 25.1 m3/h. Different operating conditions on realizing high density circulation was analyzed, while both solids circulation rate and particle holdup depended highly on operating conditions. The circulating gas-solid flow was accompanied by an evidently-dense character in the riser’s bottom zone and became fully developed in the middle and upper zones.
The gas-solid flow characteristics in the riser of a high density CFB of square (0.27 m × 0.27 m × 10.4 m) or circu-lar (-0.187 × 10.4 m) cross section, using Geldart B particles (quartz sand) was investigated experimentally. The influence of riser structure on the hydrodynamic behaviors of a high-density circulating fluidized bed was investigated. The solidity rate was up to 321 kg / (m2s) with the circular cross-section under the operating conditions of the main bed air velocity 12.1 m / s and loosen wind and back-feed wind flow 25.1 m3 / h. Different operating conditions on realizing high density circulation was analyzed, while both solids flow rate and particle holdup depended highly on operating conditions. The circulating gas- solid flow was accompanied by an evidently-dense character in the riser’s bottom zone and became fully developed in the middle and upper zones.