B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
23/370, 23/422
B01J 8/24 (2006.01) F23G 5/30 (2006.01) F27B 15/00 (2006.01)
Patent
CA 1280272
ABSTRACT A method of operating a circulating fluidized bed combustion reactor, comprising: (a) providing a substantially enclosed com- bustion reactor containing a fluidized bed of granular material, the reactor comprising a substantially upright combustion chamber and a substantially upright and cylindrical cyclonic combustor vessel adjacent to the chamber, the respective upper regions of the chamber and the vessel being connected via a conduit and the respective lower regions of the chamber and the vessel being op- eratively connected, the vessel having a cylindrically shaped exit throat aligned substantially concentrically with, and at the top of, the vessel; (b) feeding combustible matter into the com- bustion chamber; (c) supplying a first stream of pressurized air to the reactor through a plurality of openings at the bottom of the combustion chamber at a sufficient velocity to fluidize the granular material and the matter in the circulating regime for combusting a minor portion of the matter in the chamber, whereby a substantial portion of the granular bed material, combustion product gases and uncombusted matter are continually entrained out of the chamber and into the cyclonic combustor vessel via the conduit; (d) tangentially supplying a second stream of pressur- ized air into the reactor through a plurality of openings in the cylindrically shaped interior side wall of the vessel for cyclonic combustion of a major portion of the combustible matter in the vessel, the second stream being supplied, and the vessel being constructed and operated, so as to produce a Swirl number of at least about 0.6 and a Reynolds number of at least about 18,000 within the vessel for creating a cyclone of turbulence therein having at least one internal reverse flow zone, thereby increasing the rate of combustion therein; (e) permitting the combustion product bases generated in the reactor to exit from the reactor via the exit throat in the cyclonic combustor vessel, while retaining substantially all of said granular material and uncombusted matter within the reactor; (f) collecting the granu- lar bed material and any uncombusted matter in the lower region of the cyclonic combustor vessel and returning it to the lower region of the combustion chamber; and (g) controlling the combus- tion process in the reactor by controlling the flow of the first and second streams of air into the combustion chamber and the cyclonic combustor vessel, respectively, and by controlling the flow of granular bed material and matter to be combusted in the chamber and the vessel. A circulating fluidized bed combustion reactor for practicing this method is also disclosed.
538104
Cassan Maclean
Donlee Technologies Inc.
Korenberg Jacob
LandOfFree
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