FBC desulfurization process using coal with low sulfur content, high oxidizing conditions and metamorphic limestones

• Main Authors: S. R. Bragança, J. L. Castellan
• Format: Article
• Language: English
• Published: Brazilian Society of Chemical Engineering 2009-06-01
• Series: Brazilian Journal of Chemical Engineering
• Subjects: Desulfurization; Low SO2 concentration; Coal; Metamorphic limestone; Fluidized bed combustor
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322009000200015

A metamorphic limestone and a dolomite were employed as SO2 sorbents in the desulfurization of gas from coal combustion. The tests were performed in a fluidized bed reactor on a bench and pilot scale. Several parameters such as bed temperature, sorbent type, and sorbent particle size at different Ca/S molar ratios were analyzed. These parameters were evaluated for the combustion of coal with low-sulfur/high-ash content, experimental conditions of high air excess and high O2 level in fluidization air. Under these conditions, typical of furnaces, few published data can be found. In this work, a medium level of desulfurization efficiency (~60%) for Ca/S = 2 was obtained.