Dravo Lime Company

Yungli J Lee

Lewis B Benson

John W College

A wet scrubbing process for removing sulfur dioxide from combustion gases uses an aqueous slurry containing calcium components resulting from the slaking of lime, with the slaked lime formed by mixing lime with water containing a calcium sulfur-oxide salt. The presence of the calcium sulfur oxide salt in the slaking water results in a more easily dewatered sludge that is subsequently removed from the wet scrubbing system.

Sulfur dioxide removal from gases using a modified lime

A process for removing sulfur dioxide and nitrogen oxide from flue gases in a wet scrubbing system using lime to remove the sulfur dioxide and ferrous-EDTA to remove the nitrogen oxides, where an initial reducing agent, such as sodium sulfide, and an antioxidant, such as hydrazine, are added to the scrubbing system, with oxidation of the ferrous-EDTA to ferric-EDTA curtailed while removal of nitrogen oxides is increased.

Process for removing sulfur dioxide and nitrogen oxides from flue gases

A method for removing sulfur dioxide from flue gases in a wet scrubbing system where calcium thiosulfate and calcium polysulfides are formed by the reaction of lime and emulsified sulfur and the mixture added to a recycle tank of the wet scrubber where it reacts with sulfites and bisulfites in the scrubbing slurry to produce thiosulfates from the calcium polysulfides, with the slurry then returned to the scrubber. The mixture of calcium thiosulfate and calcium polysulfides may be formed in the lime slaking tank or lime storage tank of a lime scrubbing system or formed in a mixing tank and added to a lime or limestone scrubbing system.

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Pittsburgh, PA, United States of America

Yungli J Lee