Fast fluidized bed reactor and method of operating the reactor

Details Fast fluidized bed reactor and method of operating the reactor Fast fluidized bed reactor and method of operating the reactor

B - Operations, Transporting

01

J

23/370, 23/421

B01J 8/24 (2006.01) B01J 8/32 (2006.01) F22B 31/00 (2006.01) F23C 3/00 (2006.01) F23C 10/02 (2006.01) F27B 15/10 (2006.01)

Patent

CA 1193074

-42- ABSTRACT OF THE DISCLOSURE A method of operating a fast fluidized bed reactor according to the invention comprises: (1) providing a fluidized bed reactor containing a bed of granular material and having an upper and a lower region, the upper region having a cylindrically shaped interior surface and a cylindrically shaped exit throat aligned concentrically with the interior surface, the exit throat having a smaller diameter than that of the interior surface; (2) feeding matter to be reacted into the lower region of the reactor; (3) supplying a first stream of pressurized air to the reactor through a plurality of openings in the lower region at a sufficient velocity to fluidize the granular material in the cir- culating regime, whereby at least a portion of the granular mate- rial is continually entrained into the upper region; (4) tangen- tially supplying a second stream of pressurized air to the upper region of the reactor through at least one opening in the cylin- drical interior surface of the upper region wherein, at maximum operating capacity for the reactor, the second stream of air con- stitutes in excess of about 50% of the total pressurized air fed to the reactor (5) maintaining a Swirl number of at least about 0.6 and a Reynolds number of at least about 18,000 in the upper region of the reactor for providing a cyclone of turbulence in the upper region which increases the rate of reaction in the reactor and creates at least one reverse flow zone in the upper region for returning at least a portion of the granular material to the lower region of the reactor; and (6) permitting the reac- tion gases in the upper region to exit from the reactor through the exit throat, while retaining substantially all of the granu- lar material within the reactor. In accordance with the inven- tion, cyclone particle separators are not required. Apparatus suitable for use in practicing the above- recited method are also disclosed.

417942

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