Geological and thermal characterization of Eskişehir region oil shales

Kök, Mustafa Verşan; Şengüler, İlker

doi:10.1007/s10973-013-3537-x

Cited by 21 publications

(9 citation statements)

References 21 publications

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“…However, the apparent activation energy and pre‐exponential factor for oxidation of coal char are higher than those of EOS char due to a high fixed carbon content more than four times of that of EOS . Although comparison with the values from literature is difficult because of different equipment and experiment parameters used, the activation energy of EOS char oxidation is quite well in agreement with the values of Turkish oil shale oxidation under air atmosphere …”

Section: Resultssupporting

confidence: 77%

Pyrolysis and char oxidation characteristics of oil shales and coal in a thermogravimetric analyzer

Park

Song

2017

Can J Chem Eng

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Non‐isothermal thermogravimetric analysis was carried out on two different oil shales and sub‐bituminous coal in order to evaluate effects of the fuel properties and compare the reaction characteristics. The samples and their chars after the devolatilization were heated up to 900 °C at a constant heating rate of 10 K/min under inert and oxidizing atmospheres, respectively. Experimental results exhibit distinct behaviour between the samples for both pyrolysis and char oxidation processes. Pyrolysis of oil shale occurs in two temperature regimes corresponding to its organic and mineral degradation, and mineral matter plays important roles in production of the residual char at the second pyrolysis stage and its reactivity to the subsequent char oxidation. Kinetic analysis was performed using the global one‐ and multi‐step models with nth order reaction mechanism. Organic devolatilization processes of coal and oil shale are analyzed by three‐ and two‐step models, respectively, however mineral degradation of oil shale and char oxidation are analyzed by a one‐step model. Finally, a reasonable fit to the experimental data can be achieved for all the samples and their chars at different atmospheres.

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Section: Resultssupporting

confidence: 77%

Pyrolysis and char oxidation characteristics of oil shales and coal in a thermogravimetric analyzer

Park

Song

2017

Can J Chem Eng

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“…An unconventional low-calorific-value fossil fuel with combustible organic materials, oil shale can be converted into useful forms of energy mainly by pyrolysis or combustion, and approximately 69% of the global oil shale production is used to generate electricity and heat by combustion, − particularly in Estonia. − Accordingly, numerous studies have examined the characteristics, properties, mechanisms, and modeling of oil shale combustion, particularly by thermogravimetric (TG)/differential thermogravimetric (DTG) analysis. − …”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric Analysis of Huadian Oil Shale Combustion at Different Oxygen Concentrations

2016

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As the simplest conversion route, combustion is extensively applied to oil shale utilization. To improve oil shale conversion techniques, we used non-isothermal thermogravimetric analysis to explore the combustion reactivity and kinetics of Huadian oil shale at various oxygen concentrations (10, 20, 30, 50, 65, and 80 vol %) and heating rates (5, 10, and 20 °C min–1). With an increase in oxygen concentration, the combustion performances of oil shale could be significantly improved; the volatile-releasing temperature, ignition temperature, and burnout temperature decreased; the mass loss rate increased; and the integrated combustion characteristics of oil shale were enhanced. These improvements were attenuated when the oxygen concentration exceeded 50 vol %. When the oxygen concentration increased from 10 to 80 vol %, the average activation energy in the second combustion stage increased from 46.85 to 117.98 kJ mol–1 by the Kissinger–Akahira–Sunose method, from 46.85 to 117.98 kJ mol–1 by the Starink method, from 59.08 to 129.17 kJ mol–1 by the Friedman method, and from 36.34 to 57.58 kJ mol–1 by the Coats–Redfern method at a heating rate of 20 °C min–1. Results indicated oxygen enrichments beyond which additional enrichment yields significantly less enhancement to the combustion process.

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“…All samples were dried at 105 °C for 24 hours. Dried samples were crushed and sieved to a particle size below 50 mesh [18].…”

Section: Fuels Selected and Sample Preparationmentioning

confidence: 99%

Pollutant gas emissions during the co-combustion of Oil Shales from Uruguay with biomass wastes

Torres¹,

Portugau²,

Cuña³

et al. 2019

Proceedings of the 4th World Congress on Momentum, Heat and Mass Transfer

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The composition of pollutant gases (CO2, CO and SO2) during the co-combustion of Oil Shale (OS) and biomass wastes was studied in real time through thermogravimetric analysis (TG) coupled with a Fourier-Transform Infrared Spectrometer (FTIR). OS samples are from Mangrullo Formation (Uruguay). Biomass wastes were mixed with the OS at ratios 25%, 50% and 75% in mass of OS. Results showed that the emissions of pollutants per energy content of the mixture are related with the volatile decomposition and char reacting stages. CO2 emissions are significant during the volatile decomposition and subsequently combustion stage at the temperature between 400 and 500 °C. The profiles of CO2 against temperature exhibits one or two peaks, depending on the OS content of the sample and these emissions purely increased with the carbon content in the blends. The concentrations of SO2 obtained by the TG analysis showed that the amount released increases as the OS content rise. This work showed that the adding of biomass waste to the OS can improve the gas quality as reduces. Generally, the results showed that samples between 0 and 50% of OS-biomass produces lowest total SO2 emissions.

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Geological and thermal characterization of Eskişehir region oil shales

Cited by 21 publications

References 21 publications

Pyrolysis and char oxidation characteristics of oil shales and coal in a thermogravimetric analyzer

Pyrolysis and char oxidation characteristics of oil shales and coal in a thermogravimetric analyzer

Thermogravimetric Analysis of Huadian Oil Shale Combustion at Different Oxygen Concentrations

Pollutant gas emissions during the co-combustion of Oil Shales from Uruguay with biomass wastes

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