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Preparation and Characterization of Porous Filters from Ca(OH)2 and CaCO3 for SO2 Removal in Dry-FGD Process  

Han, Yo-Seop (Department of Geoenvironmental System Engineering, Hanyang University)
Kim, Hyun-Jung (Micropore Co. Ltd., Science and Technology B/D, Hanyang University)
Park, Young-Goo (Department of Environmental Engineering, Samcheok National University)
Park, Jai-Koo (Department of Geoenvironmental System Engineering, Hanyang University)
Publication Information
Applied Chemistry for Engineering / v.16, no.6, 2005 , pp. 772-777 More about this Journal
Abstract
Porous hydrated lime and limestone filters were prepared by foaming and gelcasting method, and their physical properties were evaluated. Through these analyses, it has been found that with the increased porosity and pore size of the filters, majority of pores in the filters were inter-connected by windows. Also, $SO_2$ removal efficiency for the filters was investigated. As the porosity and the reaction temperature increased, $SO_2$ removal efficiency also increased. Especially, unlike the variation of entrance concentration, the entrance flow rate had great influence on the removal efficiency. In case of the filters with an equal porosity, the hydrated lime filter had superior removal efficiency compared to the limestone filter. From these results, it was shown that the high conversion ratio to CaO from the hydrated lime filter was a result of facilitated formation of $CaSO_4$ by $SO_2$.
Keywords
pore structure; dry-FGD; $Ca(OH)_2$; $CaCO_3$; $SO_2$ removal;
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