Abstract
Coal gas desulfurization is one of the most important gas cleaning steps previous to its use in a gas turbine in integrated gasification combined cycle (IGCC) systems. In this work, 12 different calcium based materials, both natural, commercial and modified with several additives, were tested in a drop tube reactor as potential H2S removal agents at high temperatures and reducing conditions. Three limestones and a dolomite were selected by their different natures and reactivities. The commercial products used were calcium hydroxide, calcium acetate (CA), and calcium magnesium acetate (CMA). Moreover, two limestones of different nature and reactivity were used as starting material to prepare several calcium hydroxides modified with calcium lignosulfonate (LGS) and calcium acetate (CA). An important improvement in sulfur removal respect to the sorbent prepared without additives was achieved when using the modified sorbents. However, the highest sulfur removal was obtained with CA and CMA sorbents due to their ability to form highly porous cenospheres of thin walls. H2S capture up to near the thermodynamic equilibrium was achieved with dry-injection of the CA and CMA at furnace gas temperatures of about 1000 and 800 °C, respectively, a Ca/S molar ratio of 2, and 0.8 s of residence time.
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