Combustion characteristics of lignite and oil shale samples by thermal analysis techniques

Kök, Mustafa Verşan
Keskin, C
Madarasz, J
Bagci, S
In this research thermal analysis and kinetics of ten lignite's and two oil shale samples of different origin were performed using a TA 2960 thermal analysis system with themogravimetry (TG/DTG) and differential al analysis (DTA) modules. Experiments were performed with a sample size of similar to10 mg, heating rate of 10degreesC min(-1). Flow rate was kept constant (10 L h(-1)) in the temperature range of 20-900degreesC. Mainly three different reaction regions were observed in most of the samples studied. The first region was due to the evaporation of moisture in the sample. The second region was chic to the release of volatile matter and burning of carbon and called as primary reaction region. Third region Was due to the decomposition of mineral matter in samples studied. In kinetic calculations, oxidation of lignite and oil shale is described by first-order kinetics. Depending on the characteristics of the samples, the activation energy values are varied and the results are discussed.


Heating rate effect on the DSC kinetics of oil shales
Kök, Mustafa Verşan (2007-12-01)
This research was aimed to investigate the combustion and kinetics of oil shale samples (Mengen and Himmetoglu) by differential scanning calorimetry (DSC). Experiments were performed in air atmosphere up to 600 degrees C at five different heating rates. The DSC curves clearly demonstrate distinct reaction regions in the oil shale samples studied. Reaction intervals, peak and burn-out temperatures of the oil shale samples are also determined. Arrhenius kinetic method was used to analyze the DSC data and it w...
Thermal behavior and kinetics of crude oils at low heating rates by differential scanning calorimeter
Kök, Mustafa Verşan (2012-04-01)
The objective of this research was to investigate thermal behavior and kinetics of different origin crude oils in limestone matrix by differential scanning calorimeter (DSC) at low heating rates. In DSC experiments, three distinct reaction regions were identified in all of the crude oil + limestone mixtures known as low temperature oxidation (LTO), fuel deposition (FD) and high temperature oxidation (HTO) respectively. Kinetic analysis of the crude oil samples was determined by different models known as AST...
Oil shale kinetics by differential methods
Kök, Mustafa Verşan (Springer Science and Business Media LLC, 2007-06-01)
In this research, pyrolysis and combustion behavior of three different oil shale samples from Turkey were characterized using thermal analysis techniques (TG/DTG). In pyrolysis experiments, two different mechanisms causing mass loss were observed as distillation and cracking. In combustion experiments, two distinct exothermic peaks were identified known low and high temperature oxidation. On the other hand, determination of activation energies are required for the estimation of oil extraction conditions fro...
Combustion characteristics and kinetics of diesel and canola oil samples
Kök, Mustafa Verşan (2016-01-01)
In this study, combustion and pyrolysis behavior of diesel and canola oil is investigated using thermal analysis techniques known as thermogravimetry (TG-DTG) and differential scanning calorimetry (DSC) at different heating rates. Reaction regions, peak temperatures, mass loss, heat flow rates, ignition temperatures, and specific heat of diesel and canola oil samples are determined using TG-DTG and DSC data. It was observed that as the heating rate of the reactions increased, peak temperatures of the reacti...
Recent developments in the application of thermal analysis techniques in fossil fuels
Kök, Mustafa Verşan (2008-03-01)
In this review, application of thermal analysis techniques (differential scanning calorimetry, thermogravimetry, differential thermal analysis, etc.) for fossil fuel characterization and kinetics are reviewed between 2001 and 2006. The results presented clearly showed that thermal analysis applications are well-established techniques used in fossil fuel research area.
Citation Formats
M. V. Kök, C. Keskin, J. Madarasz, and S. Bagci, “Combustion characteristics of lignite and oil shale samples by thermal analysis techniques,” JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, pp. 247–254, 2004, Accessed: 00, 2020. [Online]. Available: