Combustion characteristics of coal briquettes. 2. Reaction kinetics

Altun, Naci Emre
Bagci, AS
This study comprises the influence of the major briquetting parameters, such as binder type and amount of binder and water addition, on the combustion kinetics of the coal briquettes. In this manner, briquettes that have been prepared with different organic agents (molasses, carboxyl methyl cellulose, Peridur XC3, Peridur C10, and sulfide liquor) and inorganic agents (cement and bentonite) were combusted in a reaction cell assembly that operated in coordination with a continuous gas analyzer. Moreover, not only was the addition amount of the binder providing the most favorable reaction kinetics with the lowest activation energy varied, but the quantity of the water added was also varied with fractions of 5%, 10%, and 15% (by mass), to determine the possible effect of variations in binder and water quantities. The influence of the parameters of concern on the combustion kinetics of the coal briquettes was investigated using the effluent gas analysis method and was interpreted by an Arrhenius kinetic model that operated on the basis of the changes in the amounts of CO and CO2 that were evolved and the amount Of O-2 gases that were consumed, as a function of temperature and time at three different pressure levels: 25, 50, and 75 psig. At the end of experiments, the activation energy and Arrhenius constant for each run were calculated, and it was observed that the liability of the coal briquettes to ignite and the efficiency and effectiveness of the combustion reaction were considerably affected both by the binder type used and by the amount of binding agent and water addition.


Combustion kinetics of crude oils
Kök, Mustafa Verşan (Informa UK Limited, 2002-01-01)
In this research, the reaction rates related to an in-situ combustion process were investigated and the effect of heating rate and crude oil type on the reaction rates were investigated. A laboratory model was used to run reaction kinetic experiments in unconsolidated limestone packs using three different crude oils. Experiments were performed under the same pressure and airflow rate and at two different heating rates. It was observed that oxidation of crude oil porous media follows a series of reactions. T...
Characterization of medium and heavy crude oils using thermal analysis techniques
Kök, Mustafa Verşan (Elsevier BV, 2011-05-01)
This study focused on the characterization of heavy and medium grade crude oils in limestone matrix using differential scanning calorimeter (DSC) and thermogravimetry (TG-DTG). DSC and TG-DTG curves produced for two different crude oils + limestone mixtures indicate that the crude oil undergoes two major transitions when subjected to an oxidizing and constant rate environment known as low- and high-temperature oxidation. Kinetic analysis in the low- and high-temperature oxidation regions were performed usin...
Oxidation Behavior of Light Crude Oil and Its SARA Fractions Characterized by TG and DSC Techniques: Differences and Connections
Yuan, Chengdong; Varfolomeev, Mikhail A.; Emelianov, Dmitrii A.; Eskin, Aleksey A.; Nagrimanov, Ruslan N.; Kök, Mustafa Verşan; Afanasiev, Igor S.; Fedorchenko, Gennadii D.; Kopylova, Elena V. (American Chemical Society (ACS), 2018-01-01)
This research is intended to reveal the difference and connection of oxidation behavior between crude oil and its SARA fractions. Thermogravimetry (TG) and differential scanning calorimetry (DSC) techniques were used to characterize oxidation behavior. The results showed that the oxidation behavior of individual SARA components exhibited an obvious difference. Saturates showed a weak high-temperature oxidation (HTO) region. Asphaltenes generated more heat in HTO than in the low-temperature oxidation (LTO) r...
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Kök, Mustafa Verşan; Ceylan, Ezgi; Ozkiliç, Oke (Informa UK Limited, 2005-04-01)
In this research, a laboratory work is performed to observe the combustion characteristics and reaction kinetic's of Silopi region asphaltites. A total of twelve experiments were performed with two different mesh sizes and under three different pressures. Product gas analyses were used to determine atomic H/C ratio, relative reaction rate, activation energy and Arrhenius constant for each asphaltite sample studied. The relative reaction rate vs. inverse temperature plots of Silopi asphaltite showed two main...
Combustion kinetics of oil shales by reaction cell experiments
Kök, Mustafa Verşan; Bagci, S. (Estonian Academy Publishers, 2008-01-01)
In this study, kinetics parameters of combustion reaction of Seyitomer and Beypazari oil shales were determined using Weijdema's model of reaction kinetics. The analysis of reaction kinetics experiments showed two different reaction regions at combustion of Beypazari oil shale sample. Only one reaction region was observed at combustion of Seyitomer oil shale. CO2/CO ratios increased gradually at low and medium temperatures and stabilized at high temperatures, especially after complete combustion. A decrease...
Citation Formats
N. E. Altun and A. Bagci, “Combustion characteristics of coal briquettes. 2. Reaction kinetics,” ENERGY & FUELS, pp. 1277–1282, 2003, Accessed: 00, 2020. [Online]. Available: