Removal of SO/sub 2/ from simulated flue gas by magnesia spray absorption: parameters affecting removal efficiency and products
A bench-scale apparatus simulating a spray dryer was used to study magnesia flue gas desulfurization (FGD) technology combined with spray absorption techniques for the removal of SO/sub 2/ from flue gas. The use of magnesia spray absorption technology requires fewer processing steps, reduces slurry and sludge handling as compared with limestone slurry systems, and yields a saleable sulfur byproduct. Simulated flue gases (SO/sub 2/ in N/sub 2/) were mixed with heated Mg(OH)/sub 2/ slurries and sprayed into a heated glass vessel. The inlet and exit gases were monitored for SO/sub 2/ concentration. Ranges of experimental conditions were as follows: gas flow rate, 7-10 L/min; SO/sub 2/ concentration in the inlet gas, 0.099-1.07%; slurry composition, 0.5-10% Mg(OH)/sub 2/; slurry flow rate, 1-7 mL/min; inlet gas temperature, 107-115 /sup 0/C; and dryer temperature, 73-114 /sup 0/C. The SO/sub 2/ removal efficiency ranged from 28% to nearly 100%, depending primarily on the reaction stoichiometry (Mg(OH)/sub 2//SO/sub 2/ mole ratio). The solid products were MgSO/sub 3/.3H/sub 2/O and MgSO/sub 3/.6H/sub 2/O, with the hexahydrate predominating at lower temperatures and higher humidities.
- Research Organization:
- Chemical Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
- OSTI ID:
- 5745352
- Journal Information:
- Ind. Eng. Chem. Process Des. Dev.; (United States), Vol. 25:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
FLUE GAS
DESULFURIZATION
MAGNESIUM OXIDES
SORPTIVE PROPERTIES
SULFUR DIOXIDE
ABSORPTION
REMOVAL
AIR POLLUTION MONITORING
BENCH-SCALE EXPERIMENTS
CHEMICAL REACTION YIELD
EFFICIENCY
FLOW RATE
GAS FLOW
HUMIDITY
MAGNESIUM HYDROXIDES
MEDIUM TEMPERATURE
PARAMETRIC ANALYSIS
QUANTITY RATIO
SLURRIES
SPRAY DRYING
STOICHIOMETRY
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DISPERSIONS
DRYING
FLUID FLOW
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROXIDES
MAGNESIUM COMPOUNDS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE PROPERTIES
SUSPENSIONS
WASTES
YIELDS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
424000 - Engineering- Pollution Control Equipment- (1980-1989)