Variation on anthracite combustion efficiency with CeO_2 and Fe_2O_3 addition by Differential Thermal Analysis (DTA)

摘要

Effects of CeO_2 and Fe_2O_3 on anthracite combustion efficiency were investigated using differential thermal analysis (DTA). Based on heat release (Q_D) of anthracite as well as anthracite with CeO_2 and anthracite with Fe_2O_3 additions against α-Al_2O_3 in DTA experiment, effects of additives CeO_2 and Fe_2O_3 on anthracite combustion efficiency were evaluated. Under the same experimental conditions, heat releases of raw anthracite, anthracite with CeO_2 and anthracite with Fe_2O_3 were 11.04 kJ/g, 11.30 kJ/g and 11.42 kJ/g, respectively, indicating that anthracite combustion efficiency was improved by addition of CeO_2 and Fe_2O_3. To confirm the above results, carbon transfer was monitored using Thermogravimetric analysis Fourier transform infrared (TGA-FTIR) and Carbon-Sulfur analyzer during catalytic combustion process. The results indicated that CO_2 emission was increased, whereas CO emission and residual carbon of ash were decreased, being in accordance with the results of DTA. Finally, according to analyses of ignition temperature and catalytic combustion process, the possible mechanism of catalytic combustion of anthracite was proposed.