Date of Award

8-1980

Degree Type

Thesis

Degree Name

Master of Science

Major

Environmental Engineering

Major Professor

Wayne T. Davis

Committee Members

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Abstract

The primary purpose of this research effort was to examine the dry removal of SO2 and NO from a flue gas stream by injecting two sodium additives into a pilot bag house system. The additives tested were NaHCO3 and Na2CO3 dusts with mass mean diameters ranging from approximately 30 to 200 microns. The Na2CO3 was obtained by decomposing the NaHCO3 (with heat) prior to testing. The bag house temperature was maintained at either 250 or 300 degrees F.

It was demonstrated that 70% SO2 removal can be attained with NaHCO3 powders that have mass mean diameters of 32 and 52 microns at stoichiometric ratios of 0.8 and 1.3, respectively. The rate of mass transfer limited the desulfurization capacity of NaHCO3 powders with mass mean diameters greater than 50 microns. The rate of chemical reaction limited the SO2 removal capability of the smallest NaHCO3 additive tested (mass mean diameter = 32 microns). Decomposition of NaHCO3 to Na2CO3 in bulk before injection yielded poorer SO2 removal.

It was also demonstrated that 7 to 36% of the NO was removed simultaneously with SO2 by the NaHCO3 additives with mass mean diameters smaller than 120 microns. This removal was inversely dependent on the system temperature. No appreciable NO removal was observed with Na2CO3 injection.

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