Thermogravimetric behaviour of some Turkish lignites of different sizes
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Middle East Technical University, Mining Engineering Department
Middle East Technical University, Petroleum and Natural Gas Engineering Department
Publication date: 1998-01-01
Physicochem. Probl. Miner. Process. 1998;32(1):149-156
In this study, thermogravimetric behaviour of Soma and Tuncbilek lignites of Turkey, and the effect of different particle sizes on thermal properties of these lignites were investigated. Samples were firstly crushed by jaw crusher under close control and four different size fractions were obtained. By using approximately 10 mg samples, non-isothermal thermogravimetry (TG/DTG) experiments were carried out in a temperature range of ambient to 900 °C in air atmosphere. Linear heating rate of 10 °C/min and air flow rate of 5 ml/min were chosen as operating parameters. Peak and burn-out temperatures were slightly decreased as the particle size decreased. Kinetic parameters of the samples were obtained from differential thermogravimetric data by using an Arrhenius type reaction model. TG/DTG thermograms of both samples showed two reaction regions at two different temperature ranges; first region was found to be due to the combustion of carbon part of the samples, and the second region was due to the decomposition of the mineral matter in the samples. Lower activation energies were found for Soma samples than Tuncbilek samples. Particle size had almost no effect on the activation energies in the major combustion region of the both samples. Thermogravimetry was found to be very suitable for combustion characterization of coal samples.
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