Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1990-08-17
1992-01-28
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423235, 423395, 423555, B01J 800, C01B 1700, C01B 2100
Patent
active
050842587
ABSTRACT:
Sulfur dioxide (SO.sub.2) can be oxidized to rapidly sulfur trioxide (SO.sub.3) in a high temperature environment. It has been found that the SO.sub.2 oxidation rate can be impeded by a high rate of temperature reduction in a dynamic condition such as in a boiler and the ductwork of a power plant and an industrial plant. The mechanism of the reaction kinetics has been developed. With the understanding of the mechanism, the methods for oxidation of SO.sub.2 to form SO.sub.3 have been developed. The SO.sub.3 rich flue gas is treated with lime (CaO) in a fluidized lime reactor wherein SO.sub.3 reacts with CaO to form CaSO.sub.4 coating on the surface of CaO. The high heat generated from the SO.sub.3 /CaO reaction causes the remaining SO.sub.2 to convert in the reactor to SO.sub.3 which in turn reacts with CaO to form more CaSO.sub.4. Nitrogen oxides can also be removed from flue gas by converting nitric oxide (NO) to nitrogen dioxide (NO.sub.2) via a high time rate of temperature reduction within ductwork and by sudden cooling with a spray of fine water mist or water vapor. NO.sub.2 reacts with water vapor to form nitric acid which in turn reacts with lime to form calcium nitrate Ca(NO.sub.3).sub.2. The plant gas effluent, after treatment with the improved Lin flue gas SO.sub.x /NO.sub.x removal process, is essentially free from SO.sub.x, NO.sub.x, and particulate materials.
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Heller Gregory A.
Palguta Larry J.
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