Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1994-04-29
2000-11-07
Dunn, Tom
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
42324301, 42324308, 42324401, 42324407, B01D 5350
Patent
active
061432636
ABSTRACT:
A method and system for removing SO.sub.3 and SO.sub.2 a flue gas produced by the burning of a fossil fuel. Particulates are removed from the flue gas to produce partially cleaned flue gas. A sufficient amount of calcium-based, sodium based or magnesium-based dry sorbent, preferably having a particle size larger than 1.0-2.0 microns, is injected into the flue gas to react with and remove substantially all of the SO.sub.3 from the partially cleaned flue gas to produce a substantially SO.sub.3 -free flue gas containing reacted and unreacted dry sorbent. The substantially SO.sub.3 -free flue gas is conveyed to wet scrubber means for removing SO.sub.2 to produce cleaned flue gas. In a first embodiment, sufficient dry sorbent is provided to remove desired amounts of SO.sub.3 and SO.sub.2. In a second embodiment, a make-up reagent provided to the wet scrubber means wets the dry sorbent, removes both the reacted and unreacted dry sorbent from the substantially SO.sub.3 -free flue gas, and makes the unreacted dry sorbent available as a reagent for SO.sub.2 removal, the make-up reagent and the unreacted dry sorbent reacting with and removing the SO.sub.2 from the substantially SO.sub.3 -free flue gas to produce cleaned flue gas.
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Bhat Pervaje Ananda
Goots Thomas Robert
Johnson Dennis Wayne
Baraona Robert C.
Dunn Tom
Edwards R. J.
Marich Eric
The Babcock & Wilcox Company
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