Desulfurization of flue gas from multiple boilers

Patent · Tue Jul 29 04:00:00 EDT 1986

OSTI ID:5279607

Yoon, H

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
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000 -- Engineering-- Combustion Systems
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADIPIC ACID
ADSORBENTS
AIR POLLUTION CONTROL
ALCOHOLS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AQUEOUS SOLUTIONS
BOILERS
CALCINATION
CALCIUM CARBONATES
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CARBON COMPOUNDS
CARBONATES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CONTROL
DECOMPOSITION
DESULFURIZATION
DEW POINT
DICARBOXYLIC ACIDS
DISPERSIONS
FLUE GAS
GASEOUS WASTES
GLYCEROL
HALIDES
HALOGEN COMPOUNDS
HIGH TEMPERATURE
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
MEDIUM TEMPERATURE
MIXING
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
POLLUTION CONTROL
PYROLYSIS
SODIUM CARBONATES
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SOLUTIONS
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR CONTENT
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
SUSPENSIONS
THERMOCHEMICAL PROCESSES
WASTES
WATER