Coal-burning gas turbine combustion system for reducing turbine erosion
AssigneeGeneral Electric Company
InventorWalter B. Giles
Life of this patent
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Abstract
Gas-fluidized ground coal, and coal dust slurried with fuel oil, are supplied to a reverse flow cyclone combustor which provides the functions of combustion and particulate removal. Coal dust borne by the fluidizing gas is passed through a cyclone scrubber utilizing fuel oil, and the resulting slurry is introduced into the combustor adjacent the inner surface of the combustor wall. Only the finest coal dust is employed in the slurry, to minimize oil consumption. Separative performance of the combustor is enhanced by introducing combustion air centrally adjacent the combustor outlet and gas-borne ground coal directly onto the cyclone walls.
Claims21
A combustion system for burning coal comprising:
- combustor means including a substantially conical-to-cylindrical surface;
- a fluidized bed of ground coal;
- mixing means combining a liquid fuel with elutriated coal fines from said fluidized bed to form a slurry;
- means coupling said mixing means to said cyclone combustor means for supplying said slurry adjacent the inner surface of said cyclone combustor means;
- and
- means coupling said fluidized bed to said cyclone combustor means for supplying ground coal particles above a predetermined size from said fluidized bed to a region radially-inward of said slurry in said cyclone combustion means.
In a cyclone combustion system, a method of burning coal comprising:
- combining a liquid fuel with coal fines to form a slurry;
- introducing said slurry along the inner surface of a cyclone combustor;
- and
- supplying ground coal particles radially-inward of said slurry in said cyclone combustor.
A cyclone combustor comprising:
- a vertically-oriented combustion chamber including at least a substantially conical wall of diameter increasing with height over a predetermined height range from a minimum diameter to a maximum diameter;
- a base plug situated centrally at the bottom of said combination chamber and extending upward therein, said plug being located radially-inward of said wall so as to allow clearance therebetween;
- means for introducing solid fuel in ground fluidized form at the top of said combustion chamber directed tangentially into said chamber;
- and
- means for introducing air at the top of said combustion chamber directed tangentially into said chamber radially-inward of where said solid fuel is introduced therein.
Dependencies are inferred from the claim text.