Patent ID: 7368052

Claim:
A process of discharging and transferring upwardly fluidized particles from a dense fluidizing layer forming section to a high-velocity transferring section having a diameter which is smaller than a diameter of the dense fluidizing layer forming section, wherein at least one intermediate cylindrical section having an elevation angle of 85° or greater is provided between the dense fluidizing layer forming section and the high-velocity transferring section, and wherein an average particle size of the fluidized particles is 30 to 90 μm, and a gas superficial speed for fluidization is 0.3 to 1.2 m/s in said dense fluidizing layer forming section and 3 to 30 m/s in said high-velocity transferring section; and wherein a superficial gas velocity in the at least one intermediate cylindrical section is about 0.9 to 7.2 m/s and a height of said intermediate cylindrical section is 1.5 to 4 times a diameter thereof.