Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1991-11-22
1993-05-25
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
42324308, 42324311, C01B 1700
Patent
active
052137821
ABSTRACT:
An improved magnesium-enhanced lime flue gas desulfurization system and process are provided which produce the high sulfur dioxide removal level of previous magnesium-enhanced lime flue gas desulfurization systems and additionally produce waste solids that have significantly better properties and are more easily dewatered than the solids produced by known systems. The magnesium-enhanced lime flue gas desulfurization system of the present invention includes a crystallizer-clarifier reaction tank (CCRT) which receives scrubber effluent and functions as a combined reaction tank and thickener. Clear liquor from the CCRT is sent to a scrubber to scrub the flue gas, and a portion of the CCRT-thickened solids are directed to a high pH premix slurry tank (PMST) where the crystallization environment can be controlled by reagent addition and pH. The PMST contents are circulated to the CCRT and are separated to produce a waste solids fraction that is easily dewatered. A fines removal system may also be employed to reduce the presence of fine solids and promote large crystal solids.
REFERENCES:
patent: 3873275 (1975-03-01), Bennett
patent: 3914378 (1975-10-01), Selmeczi
patent: 3919393 (1975-11-01), Selmeczi
patent: 3919394 (1975-11-01), Selmeczi
patent: 4294807 (1981-10-01), Randolph
Burke John
Gray Sterling
Moser Robert E.
Wilhelm James H.
Electric Power Research Institute
Heller Gregory A.
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