Biomasses pyrolysis and combustion kinetics through n-th order parallel reactions

Conesa, Juan A.; Domene, Antonio

doi:10.1016/j.tca.2011.05.021

Cited by 102 publications

(66 citation statements)

References 17 publications

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“…These models although based on experimental data apparently not impugned by heat and mass transfer effects, are not truly valid over widely variable conditions. Indeed, only kinetic models capable of explaining the shift in the thermogravimetric curves with the heating rate, without changing the kinetic parameters, can be considered potentially correct [23].…”

Section: Introductionmentioning

confidence: 99%

Corn stover thermal decomposition in pyrolytic and oxidant atmosphere

Conesa¹,

Urueña²,

Dı́ez³

2014

Journal of Analytical and Applied Pyrolysis

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The pyrolysis and combustion of corn stover were studied by dynamic thermogravimetry and derivate thermogravimetry (TG-DTG) at heating rates of 5, 10, 20 and 50 K min -1 at atmospheric pressure. For the simulation of pyrolysis and combustion processes a kinetic model based on the distribution of activation energies was used, with three pools of reactants (three pseudocomponents) because of the complexity of the biomass samples of agricultural origin. The experimental thermogravimetric data of pyrolysis and combustion processes were simultaneously fitted to determine a single set of kinetic parameters able to describe both processes at the different heating rates. The model proposed achieves a good correlation between the experimental and calculated curves, with an error of less than 4 % for fitting four heating rates simultaneously. The experimental results and kinetic parameters may provide useful data for the design of thermo decomposition processing system using corn stover as feedstock. On the other hand, analysis of the main compounds in the evolved gas is given by means of a microcromatograph.

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Section: Introductionmentioning

confidence: 99%

Corn stover thermal decomposition in pyrolytic and oxidant atmosphere

Conesa¹,

Urueña²,

Dı́ez³

2014

Journal of Analytical and Applied Pyrolysis

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“…Therefore the TGA experiments of biomass materials are usually evaluated by the non-linear method of least squares, assuming more than one reaction. [17][18][19] Biomass fuels and residues contain a wide variety of reactive species. The assumption of a distribution in the reactivity of the decomposing species frequently helps the kinetic evaluation of the pyrolysis of complex organic samples.…”

Section: Introductionmentioning

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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“…Numerous kinetic calculations can be found in the literature for the thermogravimetric experiments of biomass samples with very diverse results [28][29][30][31][32][33][34]. The kinetic models generally assume that the isothermal gas or liquid phase models can be applied for the dynamic experiments.…”

Section: Reaction Kinetic Modeling Using Thermogravimetric Datamentioning

confidence: 99%

“…It is frequently supposed in the kinetic models that the thermal decomposition of the biomass components takes place independently from each other. The three-component mechanism with linear or nonlinear dependence on the species concentrations, for the volatile fractions of the pseudocomponents hemicellulose, cellulose and lignin, is widely applied [28][29][30][31][32][33] to describe the dynamic thermogravimetric curves of wood/biomass devolatilization. The first pseudocomponent is associated with the shoulder and the second one with the peak of the DTG curve, whereas the lignin pseudo-component decomposes slowly over a very broad range of temperatures.…”

Section: Reaction Kinetic Modeling Using Thermogravimetric Datamentioning

confidence: 99%