Co-combustion characteristics of sewage sludge with different rank bituminous coals under the O2/CO2 atmosphere
Zhang, Y.; Zhang, L.; Duan, F.; Jiang, X.; Sun, X.; Chyang, C.
Journal of Thermal Analysis and Calorimetry 121(2): 729-736
ISSN/ISBN: 1388-6150 Accession: 082463252
The effects of sewage sludge (SS) blended ratio, O2/CO2 ratio, and type of bituminous coal on the co-combustion characteristics of Ss with bituminous coals were investigated. Thermogravimetric analysis was used to analyze the co-combustion profiles. Results show that Tg curve shifts to a lower temperature with increasing Ss blended ratio and O2/CO2 ratio. A distinct transition section exists at fixed carbon combustion of the blended fuels stage, and the temperature range of this transition section decreases significantly with increasing O2/CO2 ratio. The combustion property indexes of blended fuel increase with increasing Ss blended ratio and O2/CO2 ratio. However, effect of O2/CO2 ratio on increasing the overall co-combustion characteristics becomes smaller when the oxygen concentration exceeds 30 %. Comparing Ss blended with Huaibei (HB) bituminous coal, the Ss blended with Shenhua (SH) bituminous coal (high-rank bituminous coal) combustion has the good combustion performance.