Method of reducing sulfur dioxide emissions of a circulating...

Details Method of reducing sulfur dioxide emissions of a circulating... Method of reducing sulfur dioxide emissions of a circulating...

2004-06-23

2008-09-23

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

C423S244080, C423S555000

Reexamination Certificate

active

07427384

ABSTRACT:
A method of reducing sulfur dioxide emissions of a circulating fluidized bed boiler. Sulfur-containing carbonaceous fuel is fed to a furnace of the boiler, and calcium carbonate is fed to the furnace at a rate relative to the first stream such that the molar ratio of calcium in the second stream to sulfur in the first stream is at most about 1.0. The fuel is combined so that the sulfur is oxidized to form sulfur dioxide. The calcium carbonate is calcined to form calcium oxide and the calcium oxide is used to sulfate the sulfur dioxide to form calcium sulfate. Flue gas particles are separated using a hot loop separator, and the separated particles are returned to the furnace. A sulfur-reduction stage downstream of the furnace further reduces the sulfur content of the flue gases.

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International Search Report dated Sep. 20, 2005, mailed on Sep. 27, 2005, in corresponding PCT patent application No. PCT/FI2005/000292.

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