An experimental study on spray dry SO/sub 2/ scrubbing

Conference · Sun Jan 01 04:00:00 EST 1984 · Proc., Annu. Meet., Air Pollut. Control Assoc.; (United States)

OSTI ID:5888769

Ku, T; Overcamp, T J

Spray dry scrubbing for SO/sub 2/ removal from flue gases is an attractive alternative to conventional wet scrubbing. In this process, a solution of a reactive absorbent such as sodium bicarbonate, sodium carbonate, or lime is sprayed into the flue gas. The droplets and gas mix in a large reaction chamber. While the spray droplets evaporate, they absorb and react with SO/sub 2/. Quickly, the droplets dry to form a powder. When the gases are pulled from the reactor, the powder and any flyash are collected in a fabric filter. The absorbent powder cake on the filter cloth continues to slowly absorb SO/sub 2/ from the flue gases. Spray dry scrubber systems have several advantages in comparison to conventional wet scrubbing systems. These include lower capital costs, decreased corrosion and scaling, and the elimination of wet sludge. The principal drawback of the spray dry system is a lower rate of SO/sub 2/ removal which may necessitate a more reactive absorbent than in conventional wet systems and may require operation at a high stoichiometric ratio of absorbent to sulfur dioxide to achieve a specified SO/sub 2/ removal efficiency. The simplicity of this approach has led to dozens of orders for spray dry SO/sub 2/ control systems for both utility and industrial boilers. This paper presents experimental data on drying and SO/sub 2/ absorption for single drops of an aqueous solution of sodium carbonate. These data are compared to a simple theoretical model that describes the evaporation and the absorption of SO/sub 2/ in the first drying period.

• Research Organization: Clemson Univ., Clemson, SC
• OSTI ID: 5888769
• Report Number(s): CONF-840612-
• Conference Information: Journal Name: Proc., Annu. Meet., Air Pollut. Control Assoc.; (United States) Journal Volume: 5
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION
AIR POLLUTION ABATEMENT
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DESULFURIZATION
DISPERSIONS
DROPLETS
DRY SCRUBBERS
DRYING
EQUIPMENT
EVAPORATION
EXPERIMENTAL DATA
FLUE GAS
GASEOUS WASTES
INFORMATION
MATHEMATICAL MODELS
MIXTURES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PHASE TRANSFORMATIONS
POLLUTION ABATEMENT
POLLUTION CONTROL EQUIPMENT
SCRUBBERS
SCRUBBING
SODIUM CARBONATES
SODIUM COMPOUNDS
SOLUTIONS
SORPTIVE PROPERTIES
SPRAY DRYING
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
WASTES