Desulfurization of flue gas from multiple boilers
The method is described for reducing sulfur dioxide content of flue gas resulting from combustion of sulfur-containing fuel in a plurality of combustion zones, which method comprises: (a) injecting into a first of the combustion zones a finely divided sorbent comprising calcium carbonate; (b) recovering from the first combustion zone a first flue gas having suspended therein particles of spent sorbent and particles of calcined sorbent; (c) separating from the first flue gas a mixture of particles comprising the spent sorbent and the calcined sorbent; (d) reacting a portion of the mixture with water to provide a finely divided dry slaked sorbent; (e) combusting a portion of the sulfur-containing fuel in a second combustion zone to produce a second flue gas containing sulfur dioxide; (f) mixing into the second flue gas at a point where its temperature is between about 120/sup 0/ and about 230/sup 0/ C. slaked sorbent from step (d) to produce a suspension of slaked sorbent in flue gas wherein water is added to the suspension of slaked sorbent in flue gas of step (f) in amount sufficient to reduce the temperature of the suspension to between about 10/sup 0/ and about 30/sup 0/C. above its dew point wherein the water comprises an aqueous solution of at least one solubilizing agent selected from the group consisting of sodium hydroxide, sodium carbonate, calcium chloride, adipic acid and glycerol; (g) separating solids from the suspension of slaked sorbent in flue gas; and (h) collecting from the separating of steps (c) and (g) flue gases of reduced sulfur dioxide content.
- Assignee:
- Conoco, Inc., Wilmington, DE
- Patent Number(s):
- US 4603037
- OSTI ID:
- 5279607
- Resource Relation:
- Patent File Date: Filed date 22 Mar 1985
- Country of Publication:
- United States
- Language:
- English
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Flue gas desulfurization process
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Related Subjects
42 ENGINEERING
BOILERS
AIR POLLUTION CONTROL
FLUE GAS
CALCIUM CARBONATES
SORPTIVE PROPERTIES
DESULFURIZATION
SULFUR DIOXIDE
ADIPIC ACID
ADSORBENTS
AQUEOUS SOLUTIONS
CALCINATION
CALCIUM CHLORIDES
DEW POINT
GLYCEROL
HIGH TEMPERATURE
MEDIUM TEMPERATURE
MIXING
MIXTURES
PARTICULATES
SODIUM CARBONATES
SODIUM HYDROXIDES
SULFUR CONTENT
SUSPENSIONS
WATER
ALCOHOLS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM HALIDES
CARBON COMPOUNDS
CARBONATES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CONTROL
DECOMPOSITION
DICARBOXYLIC ACIDS
DISPERSIONS
GASEOUS WASTES
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
POLLUTION CONTROL
PYROLYSIS
SODIUM COMPOUNDS
SOLUTIONS
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
WASTES
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
421000 - Engineering- Combustion Systems