DTGA combustion of coals in the Exxon coal library

Smith, Stewart E.; Neavel, Richard C.; Hippo, E.J.; Miller, Robert N.

doi:10.1016/0016-2361(81)90103-4

Cited by 107 publications

(32 citation statements)

References 2 publications

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“…For the secondary combustion step it follows that (9) where w f is the residual weight of the sample as secondary combustion is finished, and k 2 is the reaction rate coefficient for the secondary combustion step. From the TG and DTG results for the various heating rates considered and are obtained as a function of 1/T, for both primary and secondary combustion steps.…”

Section: Resultsmentioning

confidence: 99%

“…The first takes account of the combined devolatilization and simultaneous fixed carbon combustion, while the second takes account of the following fixed carbon combustion alone. Smith et al 9 studied the kinetics of combustion of various coals ranging from lignites to low volatile bituminous, and found different activation energies standing for four different regions of combustion related to different ranges of temperature. Cumming 10 confirmed the findings of Smith et al 9 , and proposed a procedure for determining a mean activation energy from the different values found at different ranges of temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Non-isothermal methods have been widely applied for complex heterogeneous reactions (e.g. 9,10,27,[28][29][30][31][32][33][34][35][36][37][38] ). Kok et al 39 and Solomon et al 40 observe that non-isothermal chemical kinetic studies of coal combustion are made difficult by the presence of various complex substances in coals, and due to the high number of consecutive and parallel chemical reactions that take place.…”

Section: Introductionmentioning

confidence: 99%

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A thermogravimetric analysis of the combustion of a Brazilian mineral coal

Filho¹,

Milioli²

2008

Quím. Nova

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Recebido em 8/3/07; aceito em 11/7/07; publicado na web em 19/12/07Knowledge of coal combustion kinetics is crucial for burner design. This work aims to contribute on this issue by determining the kinetics of a particular Brazilian bituminous coal. Non-isothermal thermogravimetry was applied for determining both the preexponential factor and the activation energy. Coal samples of 10 mg and 775 μm mean size were used in synthetic air atmospheres (21 % O 2 ). Heating rates from 10 to 50 o C/min were applied until the temperature reached 850 o C, which was kept constant until burnout. The activation energy for the primary and the secondary combustion resulted, respectively, in 135.1 kJ/mol and 85.1 kJ/mol.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A thermogravimetric analysis of the combustion of a Brazilian mineral coal

Filho¹,

Milioli²

2008

Quím. Nova

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“…The activation energy in this stage is lower than that of the primary stage and appears to be independent of the coal rank. Generally, the mass transfer process has a low activation energy [17,20] and hence, the secondary stage at higher temperature is mainly a diffusion process. It is well known that heating rate has an effect on coal pyrolysis.…”

Section: D4mentioning

confidence: 99%

A kinetic analysis of the pyrolysis of some australian coals by non-isothermal thermogravimetry

Hill

Heng

1991

Journal of Thermal Analysis

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The pyrolysis of a suite of brown coal samples and bituminous coal maceral concentrates is investigated by non-isothermal thermogravimetry. The TG data for these coals reveal a two.stage pyrolysis process. The activation energy for the primary pyrolysis stage is considerably higher than that for the secondary pyrolysis stage. It is evident that a particular coal may be characterised by the weighted mean apparent pyrolysis activation energy which correlates with the corresponding specific energy of the coal.

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“…A very good correlation is obtained between the results. Smith et al [13] investigated the burning process of different coal samples and found that the burning temperature of the coals is linearly dependent on their concentration.…”

Section: Introductionmentioning

confidence: 99%

Determination of kinetic parameters of different origin coals using software

Ertunc

Kök

2014

J Therm Anal Calorim

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In this study, combustion characteristics and kinetics of three coal samples are examined. A series of thermogravimetry (TG-DTG) and differential scanning calorimetry (DSC) measurements were carried out in nonisothermal conditions at heating rates of 5, 10, and 15 K min -1 . Reaction regions, peak and burn-out temperatures, mass loss, and heat of reactions of the samples were determined for each heating rate from TG-DTG and DSC curves. A variety of computational methods, available in the software developed, were applied to experimental data for the evaluation of the kinetic parameters of the coal samples, and the results are discussed.

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DTGA combustion of coals in the Exxon coal library

Cited by 107 publications

References 2 publications

A thermogravimetric analysis of the combustion of a Brazilian mineral coal

A thermogravimetric analysis of the combustion of a Brazilian mineral coal

A kinetic analysis of the pyrolysis of some australian coals by non-isothermal thermogravimetry

Determination of kinetic parameters of different origin coals using software

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