Thermal Decomposition of Wheat, Oat, Barley, and Brassica carinata Straws. A Kinetic Study

Várhegyi, Gábor; Chen, Honggang; Godoy, S.

doi:10.1021/ef800868k

Cited by 77 publications

(93 citation statements)

References 43 publications

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“…The data are consistent with the literature consulted [18]. The reaction order for this fraction is close to unity, as it is accepted for this type of material [8,15,19,20].…”

Section: Discussionsupporting

confidence: 90%

Thermogravimetric and kinetic analysis of the decomposition of solid recovered fuel from municipal solid waste

Conesa

Rey

2015

J Therm Anal Calorim

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The thermal decomposition of a Solid Recovered Fuel (SRF) has been studied using thermogravimetry, in order to get information about the main steps in the decomposition of such material. The study comprises two different atmospheres: inert and oxidative. The kinetics of decomposition is determined at three different heating rates using the same kinetic constants and model for both atmospheres at all the heating rates simultaneously. A good correlation of the TG data is obtained using three n th order parallel reactions.

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“…The data are consistent with the literature consulted [18]. The reaction order for this fraction is close to unity, as it is accepted for this type of material [8,15,19,20].…”

Section: Discussionsupporting

confidence: 90%

Thermogravimetric and kinetic analysis of the decomposition of solid recovered fuel from municipal solid waste

Conesa

Rey

2015

J Therm Anal Calorim

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“…The method used for the determination of -dm obs /dt does not introduce considerable systematic errors into the least squares kinetic evaluation of experimental results. 34 The model was solved numerically along the empirical temperature -time functions. The minimization of the least squares sum was carried out by a direct search method, as described earlier.…”

Section: Kinetic Evaluation By the Methods Of Least Squares And Characmentioning

confidence: 99%

Thermal Decomposition Kinetics of Woods with an Emphasis on Torrefaction

et al. 2013

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ABSTRACT. The pyrolysis kinetics of Norwegian spruce and birch wood was studied to obtain information on the kinetics of torrefaction. Thermogravimetry (TGA) was employed with nine different heating programs, including linear, stepwise, modulated and constant reaction rate (CRR) experiments. The 18 experiments on the two feedstocks were evaluated simultaneously by the 2 method of least squares. Part of the kinetic parameters could be assumed common for both woods without a considerable worsening of the fit quality. This process results in better defined parameters and emphasizes the similarities between the woods. Three pseudocomponents were assumed. Two of them were described by distributed activation energy models (DAEM), while the decomposition of the cellulose pseudocomponent was described by a self-accelerating kinetics. In another approach all the three pseudocomponents were described by n-order reactions. Both approaches resulted in nearly the same fit quality but the physical meaning of the model based on three n-order reactions was found to be problematic. The reliability of the models was tested by checking how well the experiments with higher heating rates can be described by the kinetic parameters obtained from the evaluation of a narrower subset of 10 experiments with slower heating. A table of data was calculated that may provide guidance about the extent of devolatilization at various temperatureresidence time values during wood torrefaction.

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“…This procedure does not introduce considerable systematic errors into the least squares kinetic evaluation of experimental results. 20 The differential equations of the model were solved numerically along the empirical temperature -time functions resulting in simulated data in the ti points of the observations.…”

Section: Methodsmentioning

confidence: 99%

Thermogravimetric Analysis of Tobacco Combustion Assuming DAEM Devolatilization and Empirical Char-Burnoff Kinetics

Várhegyi

Czégény

Liu³

et al. 2009

Ind. Eng. Chem. Res.

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ABSTRACT. Two blends of tobacco (Virginia and Burley) were studied by thermogravimetry at linear and nonlinear heating programs in gas flows containing 2, 4 and 9% oxygen. A kinetic scheme of successive devolatilization and char burn-off reactions was assumed. A distributed activation energy model was assumed for the devolatilization with a Gaussian distribution and a constant pre-exponential factor. The evaluations were also carried out using non-constant pre-exponential factors that depended on the activation energy. The char burn-off was described by first order kinetics and by an empirical model that took into account the change of the reactivity with the conversion of the sample. The dependence of the rate of combustion on the oxygen concentration was approximated by a power function. Series of 15 and 30 experiments were used for the determination of the model parameters by simultaneous least squares evaluation of the experiments. The considerations, methods and results can also be used in the field of biomass gasification and combustion.

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Thermal Decomposition of Wheat, Oat, Barley, and Brassica carinata Straws. A Kinetic Study

Cited by 77 publications

References 43 publications

Thermogravimetric and kinetic analysis of the decomposition of solid recovered fuel from municipal solid waste

Thermogravimetric and kinetic analysis of the decomposition of solid recovered fuel from municipal solid waste

Thermal Decomposition Kinetics of Woods with an Emphasis on Torrefaction

Thermogravimetric Analysis of Tobacco Combustion Assuming DAEM Devolatilization and Empirical Char-Burnoff Kinetics

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