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  • Development of non-isotherm...
    Li, Bo; Chen, Gang; Zhang, Hui; Sheng, Changdong

    Fuel (Guildford), 02/2014, Letnik: 118
    Journal Article

    •New method was developed to derive kinetics from TGA–DSC at a single heating rate.•Equivalence of TGA–DSC and basket heating methods in kinetics analysis was proven.•TGA–DSC facilitates kinetics analysis of low temperature oxidation before ignition.•TGA–DSC is a cost effective method to analyze low temperature oxidation kinetics. The present work was aimed at developing a method for determining the kinetics of low temperature coal oxidation based on thermogravimetric analysis and differential scanning calorimetry (TGA–DSC). The analyses of TGA–DSC on non-isothermal oxidation of three coals at a single heating rate were carried out. The measured heat release rates and derived apparent kinetic parameters of low temperature oxidation were compared with those from the tests of basket heating methods (crossing point temperature and heat release method). The results demonstrated the equivalence of the TGA–DSC technique and the basket heating methods in measuring the heat release rate and kinetics of coal oxidation in the temperature range of about 100–150°C. Moreover, the TGA–DSC method can also measure the kinetic parameters of coal oxidation at the temperatures from ∼150°C to that of ignition occurring, which were shown to be different from those at the temperatures below ∼150°C. Therefore, the TGA–DSC method developed here is promising to be applied as a cost effective technique for deriving the kinetics of low temperature oxidation to describe coal spontaneous combustion process prior to ignition.