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Dry Scrubbing Technologies for Flue Gas Desulfurization pp 607–690Cite as

Advances in Spray Drying Desulfurization for High-Sulfur Coals

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Abstract

Advances in spray drying desulfurization for high-sulfur coals were investigated, with a focus on two major areas where improvements can be made: the spray dryer technology itself and the chemical process involving the absorption of SO2. This chapter documents (1) measuring lime dissolution rates at different conditions and with additives in a bench-scale apparatus; (2) direct tests of additive mechanisms in a pilot spray dryer absorber; (3) tests of hydrated fly ash and lime mixtures as new sorbents in a pilot spray dryer; and (4) theoretical studies on the mechanisms of the additive effects.

The mechanisms responsible for improvements in performance with the use of additives were investigated and discussed. Changes in the hygroscopicity of the sorbent slurry were incorporated into a spray dryer mathematical model that examines the drying of slurry droplets, mass transfer, and reaction in the droplet. This model describes the improvements measured in experimental tests with reasonable accuracy.

The lime dissolution rate was measured in the presence of a variety of inorganic and organic additives. The effects of additives were studied directly in a spray dryer. Hygroscopic additives had significant effects on improving lime utilization and SO2 removal in spray dryers; buffer additives had little or no effect. Experiments showed that over 90% removal of the SO2 concentration from a high sulfur coal flue gas can be achieved in spray dryers with the appropriate use of additives and operating conditions.

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Authors and Affiliations

  1. The Department of Civil and Environmental Engineering, USA

    Tim C. Keener & Jun Wang

  2. The Department of Chemical Engineering, The University of Cincinnati, Cincinnati, Ohio, USA

    Soon-Jai Khang

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Keener, T.C., Wang, J., Khang, SJ. (1998). Advances in Spray Drying Desulfurization for High-Sulfur Coals. In: Dry Scrubbing Technologies for Flue Gas Desulfurization. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4951-2_8

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