O2/CO2气氛下石灰石煅烧与硫化反应研究

Oxygen-enriched combustion of coal is one of the new technologies that can control pollutants emission. Thermodynamic analysis for calcination of limestone under O2/CO2 atmosphere in fluidized bed condition was carried out, which is accorded with the TG (Thermal Gravity) results. The initial decomposition temperature of CaCO3 was increased with increasing CO2 partial pressure. Calcination and desulfurization of limestone under O2/CO2 atmosphere were performed in a fluidized bed test-facility. Calcined and desulfurized limestones were analyzed by PM (Press Mercury) and SEM (Scanning Electron Microscope). Pore structure characteristics were different between atmosphere of air and O2/CO2 ratio of 1∶4 during the process of calcination and desulfurization. Limestone sulfuration under O2/CO2 atmosphere was accompanied by calcination.