Removal of SO2 from Simulated Flue Gas by Magnesia Spray Absorption: Parameters Affecting Removal Efficiency and Products

B. Zane Egan, L. Kevin Felker

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

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 SO2 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 (SO2 in N2) were mixed with heated Mg(OH)2 slurries and sprayed into a heated glass vessel. The inlet and exit gases were monitored for SO2 concentration. Ranges of experimental conditions were as follows: gas flow rate, 7-10 L/min; SO2 concentration in the inlet gas, 0.099-1.07%; slurry composition, 0.5-10% Mg(OH)2; slurry flow rate, 1-7 mL/min; inlet gas temperature, 107-115 °C; and dryer temperature, 73-114 °C. The SO2 removal efficiency ranged from 28% to nearly 100%, depending primarily on the reaction stoichiometry [Mg(OH)2/SO2 mole ratio]. The solid products were MgSO3•3H2O and MgSO3•6H2O, with the hexahydrate predominating at lower temperatures and higher humidities.

Original languageEnglish
Pages (from-to)558-561
Number of pages4
JournalIndustrial and Engineering Chemistry Process Design and Development
Volume25
Issue number2
DOIs
StatePublished - 1986

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