Study on the Coal Combustion and Desulfurization Catalyzed by Nano-Additives

摘要

The effects of nano-TiO₂ dosage, Ca/S and temperature on CaO desulfurization and coal combustion were studied. The products were characterized by SEM and IR analysis. The catalysis mechanisms of nano-TiO₂ were discussed. The results show that desulfurization efficiency was 87.7% when nano-TiO₂ dosage is 6%, Ca/S 2, temperature 850degC; it was 16.8% higher than that without addition. The ignition temperature, the burnout temperature and apparent activation energy of bituminous decreased 3degC, 8degCand 2.9 kJ/mol by nano-TiO₂ with CaO addition respectively. The pore diameter and surface area of coal ashes with nano-TiO₂ addition increase because of the active centers of nano-TiO₂ surface; this is helpful to the diffusion and reaction of SO₂ and O₂, and the desulphurization and coal combustion efficiency increase. The results may be used to provide a useful basis for further applying nano-TiO₂ additive in power plant.