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Materials, Methods & Technologies, Volume 12, 2018

Agacayak T., Duzyol S.
Pages: 173-178
Published: 6 Sep 2018
Views: 774
Downloads: 209
Abstract: Some properties of material such as mass, reaction rate, and volume can be measured as a function of increasing temperature, with controllably burning. These type of analysis are called ‘thermal analysis methods’. Generally, thermogravimetric (TG) analysis, differential thermal (DT) analysis, and differential thermogravimetric (DTG) analysis techniques are used to determine the combustion characteristics of combustible materials. Thermogravimetric analyse (TGA) is one of the most common techniques used to determine the combustion properties of materials and to investigate their kinetics rapidly. In this study, the TG analyses were carried out to investigate the combustion characteristics of Beysehir coal. Three different reaction regions were observed in TGA and DTGA curves. The burning profile of the coal sample was investigated by determining the peak temperatures and ignition temperatures. In the kinetic analyses, activation energies were calculated separately for four different reaction orders by using the Coats-Redfern method. It was observed that the moisture of the Beysehir coal moved away between at 25-130 °C, the thermal degradation took place between at 235-540 °C, and the final combustion temperature was 570-690 °C. Weight loss of coal was determined as 28% for the first region, 48% for the second region and 6% for the third region. The ignition temperature and peak temperature were found to be 196 °C and 376 °C, respectively. The activation energies were varied from 8.25 to 18.79 kJ/mol.
Keywords: coal, combustion, combustion kinetics, tga, dtga
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