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Title: Flue gas desulfurization process

The method is described for reducing sulfur dioxide content of a flue gas resulting from combustion of a sulfur-containing fuel. The method consists of: (a) mixing into the flue gas, at a point where its temperature is between about 120/sup 0/ and about 230/sup 0/ C., a finely divided dry sorbent comprising alkaline earth metal oxide or hydroxide in amount sufficient to provide a metal salt: sulfur ratio of at least about 0.5, the alkaline earth metal being selected from calcium and magnesium; (b) spraying into the resulting suspension of sorbent in flue gas an aqueous solution of solubilizing agent, such agent being selected from sodium hydroxide, sodium carbonate, calcium chloride, adipic acid and glycerol; (c) providing a contact time between the sorbent in flue gas and droplets resulting from the spraying of at least about 1 second; (d) subsequently separating from the flue gas solids comprising sorbent and solids resulting from combustion of the fuel; (e) discharging from the separating a flue gas of substantially diminished sulfur dioxide content; and (f) regulating the rate of the spraying relative to the rate of the flue gas such that the temperature of the flue gas at the point of the separatingmore » is between about 10/sup 0/ C. and about 35/sup 0/ C. above its saturation temperature.« less
Authors:
;
Publication Date:
OSTI Identifier:
5455275
Report Number(s):
US 4600568
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 22 Mar 1985
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; FLUE GAS; DESULFURIZATION; SULFUR DIOXIDE; AIR POLLUTION ABATEMENT; ADIPIC ACID; ADSORBENTS; ALKALINE EARTH METAL COMPOUNDS; AQUEOUS SOLUTIONS; CALCIUM CHLORIDES; COMBUSTION PRODUCTS; DROPLETS; FUELS; GLYCEROL; HIGH TEMPERATURE; MAGNESIUM COMPOUNDS; MEDIUM TEMPERATURE; MIXING; OXIDES; QUANTITY RATIO; SODIUM CARBONATES; SODIUM HYDROXIDES; SPRAYS; TIME DEPENDENCE; ALCOHOLS; ALKALI METAL COMPOUNDS; CALCIUM COMPOUNDS; CALCIUM HALIDES; CARBON COMPOUNDS; CARBONATES; CARBOXYLIC ACIDS; CHALCOGENIDES; CHEMICAL REACTIONS; CHLORIDES; CHLORINE COMPOUNDS; DICARBOXYLIC ACIDS; DISPERSIONS; GASEOUS WASTES; HALIDES; HALOGEN COMPOUNDS; HYDROGEN COMPOUNDS; HYDROXIDES; HYDROXY COMPOUNDS; MIXTURES; ORGANIC ACIDS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; PARTICLES; POLLUTION ABATEMENT; SODIUM COMPOUNDS; SOLUTIONS; SULFUR COMPOUNDS; SULFUR OXIDES; WASTES 500200* -- Environment, Atmospheric-- Chemicals Monitoring & Transport-- (-1989)