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The sulfur capture capacities of 11 limestones and six dolomites were determined by means of a pressurized thermogravimetric analyser. The determinations were made under conditions relevant to pressurized fluidized bed combustion. The actual experiments were performed at two different temperatures (850 and 950°C) and at a pressure of 1.5 MPa. Additionally, some experiments were performed at atmospheric...
A coking coal containing 4.9 wt%, db, of sulfur was subjected to pyrolysis at 330-1700°C in an atmosphere of evolved gases. The changes in the forms of sulfur were determined by wet chemical analysis. Scanning electron microscopy (SEM) combined with X-ray microanalysis were used to monitor the reduction of pyrite during coal pyrolysis and the retention of sulfur by the alkali constituents of the...
Previous chemical equilibrium calculations as well as experimental results concerning cocombustion of high sulfur containing fuels and biomass fuels have shown that a significant retention of sulfur can be obtained in the ash. The processes are, however, complex and to minimize the SO 2 emissions, experiments were performed, according to statistical experimental designs, in a small pilot...
Least square analysis of the X-ray absorption near edge structure (XANES) region of sulfur K edge X-ray absorption fine structure (XAFS) spectra can provide a quantitative analysis of both the organic and inorganic functional forms of sulfur in coal. In the current article, this method is applied to speciation of the sulfur forms in a number of desulfurized coals. The samples investigated include...
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