Method to produce type f, c and n pozzolin fly ash from a fluidized bed boiler
AssigneeQ Power LLC
InventorJeffrey Campbell
Life of this patent
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Abstract
A process for producing fly ash in a fluidized bed boiler includes combusting a fuel in a fluidized bed combustor in the presence of limestone particles, recovering fly ash, and recovering bottom ash. The fuel contains hydrocarbons and sulfur. A majority of the sulfur from the fuel is recovered from the bottom ash. The fly ash may contain less than 5% by weight of sulfur oxides. This may be achieved by using limestone particles having certain properties and/or narrowing an inlet from the boiler into a cyclone.
Claims20
A method for producing a fly ash comprising:
- feeding a fuel to a fluidized bed combustor, the fuel comprising hydrocarbons and sulfur;
- feeding limestone particles to the fluidized bed combustor;
- combusting the fuel in the fluidized bed combustor to produced a flue gas;
- recovering a bottom ash from the fluidized bed combustor;
- and
- recovering a fly ash from the fluidized bed combustor;
- wherein the fly ash comprises less than 5% by weight of sulfur oxides.
The method of claim 4, wherein the cross-sectional area is decreased by a bullnose modification to the inlet.
A fluidized bed boiler system for producing fly ash comprising:
- a fluidized bed combustor comprising a fuel inlet, a recycle inlet, and a boiler outlet;
- and
- a recycle device comprising a device inlet connected to the boiler outlet, a recycle outlet connected to the recycle inlet, and a flue gas outlet;
- wherein the recycle inlet has a cross-sectional area which decreases in the direction of the recycle device.
A cyclone separator device comprising an inlet, wherein the inlet comprises a bullnose modification, a steam injector, and a steam blanket;
- and wherein a cross-sectional area of the inlet decreases with increasing depth into the inlet.
Dependencies are inferred from the claim text.