Functional group characteristics and pyrolysis/combustion performance of fly ashes from Karamay oily sludge based on FT-IR and TG-DTG analyses

Wenlong Mo’s paper “Functional group characteristics and pyrolysis/combustion performance of fly ashes from Karamay oily sludge based on FT-IR and TG-DTG analyses” discussed molecular structure, pyrolysis property and combustion performance of three pyrolyzed fly ashes. Results showed that the relative abundance of aromatic compounds and its derivatives in BDC was lower than that of others. Pyrolysis performance of each fly ash was quite different, among which the weight loss of BDC was higher of 44.3%, while the losses of CS1 and CS2 were 8.77% and 9.66%, respectively. Combustion performance showed that the comprehensive combustion characteristic index (SN) and combustion stability index (DW) of BDC were higher of 25.03%2min−2·°C−3 and 10.45 %2·min−1·°C−3, respectively, presenting well combustion performance. [Display omitted] •Molecular structure, pyrolysis and combustion performance of fly ashes from oily sludge were studied.•Pyrolysis kinetics based on Coast-Redfern model presented that the reaction order of three fly ashes could be selected as n = 5.•The order of combustion kinetics for CS1, CS2 and BDC might be assigned to 1 (or 2), 2 (or 3) and 1, respectively. Three fly ashes, sequentially from the primary cyclone separator (CS1), the secondary cyclone separator (CS2) and the bag-type dust collector (BDC) at the outlet of industrial oily sludge pyrolyzer, were characterized by proximate analysis, ultimate analysis, FT-IR and TG-DTG methods. Molecular structure, pyrolysis and combustion performance of each fly ash were discussed. Results showed that content of volatile matter in BDC was 16.92% (dry base), and the contents in CS1 and CS2 were similar of 11.18% and 12.51%, respectively. Pyrolysis performance of each fly ash was quite different, among which the weight loss of BDC was higher of 44.3%, while the losses of CS1 and CS2 were 8.77% and 9.66%, respectively. Combustion performance showed that the comprehensive combustion characteristic index (SN) and combustion stability index (DW) of BDC were higher of 25.03 %2·min−2·°C−3 and 10.45 %2·min−1·°C−3, respectively, presenting well combustion performance. Pyrolysis kinetics based on Coats-Redfern model presented that the reaction order of three fly ashes could be selected as n = 5. While the order of combustion kinetics for CS1, CS2 and BDC might be assigned to 1 (or 2), 2 (or 3) and 1, respectively.