AbstractWith the goal of adding the appropriate amount of SrCO3 to coal, the synergistic effects of SrCO3 and desulfurization agents were studied by using a sulfur determination device and a carbon–sulfur spectrometer. Mineral constituents were investigated with an XRD diffraction analyzer. Results show that, at a given temperature, desulfurization efficiency increased in varying degrees based on the proportion of added SrCO3. An increasing amount of calcium sulphoaluminates also appeared in the ash residue. Meanwhile, SrCO3, sulfur capture capacity improved when the temperature reached 1200°C because of the large amount of generated calcium sulphoaluminates (3CaO·3Al2O3·CaSO4) and the controlled decomposition of CaSO4. At temperatures of 1200°C–1300°C, the ascending rate of the sulfur-fixing ratio decreased due to the sharp decomposition of CaSO4 and the pyrolysis of a small amount of calcium sulphoaluminate. From 1300°C, the decomposition of increasing amounts of calcium sulphoaluminate gradually worsened the desulfurization. The diffraction peak of calcium sulphoaluminate was the strongest at 1300°C and the sulfur-fixing ratio was also the largest. Therefore, calcium sulphoaluminate reached the highest level at this temperature.
Green Processing and Synthesis – de Gruyter
Published: Nov 27, 2017