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Study on Calcination Characteristics of Limestones for In-Furnace Desulfurization in Oxy-Fuel Combustion  

An, Young-Mo (Korea Institute of Energy Research)
Jo, Hang-Dae (Korea Institute of Energy Research)
Choi, Won-kil (Korea Institute of Energy Research)
Park, Yeong-Sung (Department of Environmental Engineering, Daejeon University)
Keel, Sang-In (Korea Institute of Machinery & Materials)
Lee, Hyung-Keun (Korea Institute of Energy Research)
Publication Information
Journal of Korean Society of Environmental Engineers / v.31, no.5, 2009 , pp. 371-377 More about this Journal
Abstract
In oxy-fuel combustion, $CO_2$ concentration in the flue gas may be enriched up to 95% owing to the gas recirculation. Under the high $CO_2$ concentration, the calcination characteristic of limestone is different from that of the conventional air combustion system. In this study, three types of limestone taken from different regions in Korea were used as $SO_2$ absorbent and their calcination characteristics depending on calcination temperature were investigated. The experiments were performed to examine the effects of operating variables such as absorbent species, reaction temperatures on the $SO_2$ removal efficiency and reacted limestone particles were captured to examine the sulfur contents. The degree of calcination and the specific surface area increased with calcination temperature and $SO_2$ removal efficiency increased with reaction temperature. The results showed remarkable difference in $SO_2$ removal efficiencies between the limestone types. The sulfur content of the reacted limestone with the highest $SO_2$ removal efficiency was about 10%.
Keywords
Oxy-fuel Combustion; Limestone Calcination Characteristics; In-furnace Desulfurization;
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