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The effects of the fluid density on the flow structures in the circulating fluidized bed (CFB) are numerically studied. The studies of a benchmark gas-solid CFB case and 3 other cases with the fluid density of 500, 1000, and 1200 kg/m are carried out under the equivalent operating conditions. The axial and radial profiles of the average phase holdups and their corresponding standard deviations are obtained and compared. The average velocity profiles and the corresponding standard deviations of the fluid and solid phases in X and Y directions are also provided. Results show that a smaller density difference between the fluid and solid phases leads to a less fluctuating flow structures in the CFB reactor. Keywords-circulating fluidized bed; fluid density; flow structure

Numerical Studies of the Effects of the Fluid Density on the Flow Structures in Circulating Fluidized Beds