US 4,287,838 A · Fluidized bed coal combustion reactor

Fluidized bed coal combustion reactor

OwnerRobert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch, Philip I. Moynihan +1inventors

InventorsRobert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch, Philip I. Moynihan, Donald L. Young

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Abstract

A fluidized bed coal reactor includes a combination nozzle-injector ash-removal unit formed by a grid of closely spaced open channels, each containing a worm screw conveyor, which function as continuous ash removal troughs. A pressurized air-coal mixture is introduced below the unit and is injected through the elongated nozzles formed by the spaces between the channels. The ash build-up in the troughs protects the worm screw conveyors as does the cooling action of the injected mixture. The ash layer and the pressure from the injectors support a fluidized flame holder combustion zone above the grid which heats water in boiler tubes disposed within and/or above the combustion zone and/or within the walls of the reactor.

Claims8

Dependent claims

A reactor for combusting a suspension of fluidized carbonaceous fuel comprising in combination:

wall means defining a vertical reaction chamber;
a horizontal grid of upwardly facing channels which are arcuate in shape with outwardly diverging upper ends, said channels being mounted in said reaction chamber with preselected spacing between the channels defining elongate nozzle openings;
ash removal means mounted in each of said channels;
means for injecting a suspension of carbonaceous fuel into said reaction chamber below said grid whereby said suspension is injected through said openings into a combustion zone above said grid;
and
means for removing combustion gases from said chamber.

3 more elements

Dependencies are inferred from the claim text.