Transformation of lignocellulosic biomass during torrefaction

Park, Junyeong; Meng, Jiajia; Lim, Kwang Hun; Rojas, Orlando J.; Park, Sunkyu

doi:10.1016/j.jaap.2012.12.024

Cited by 181 publications

(105 citation statements)

References 39 publications

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“…could be explained in part by the partial removal of hemicelluloses during torrefaction at this temperature. The large peak at around 370 °C, in all cases, can be related with the degradation of cellulose (Chen and Kuo 2010, Park et al 2013, Pelaez-Samaniego et al 2014. The thermal stability of the samples is consistent with the proximate and ultimate analyses in Table 2, where no major changes were observed on chemical composition of the raw material ant the samples of material torrefied at 200 and 250 °C.…”

Section: Py-gc/mssupporting

confidence: 82%

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Effect of torrefaction temperature on properties of Patula pine

Ramos-Carmona

Pérez

Peláez-Samaniego

et al. 2017

Maderas, Cienc. tecnol.

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The objective of this work was to study the effect of torrefaction temperature on properties of patula pine (Pinus patula) wood that could be of interest for further thermochemical processing. Torrefaction temperature was varied from 200 to 300 °C for 30 minutes using a batch spoon type reactor. Raw and torrefied materials were characterized for proximate and ultimate analyses, thermogravimetry, and pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). Results showed that torrefied pine has greater higher heating value and chemical exergy due to the reduction of O/C and H/C ratios. Compared with raw biomass, the material torrefied at 200 and 250 °C did not present significant changes in chemical composition and thermal behavior. Conversely, material torrefied at 300 °C did show important changes in both chemical composition and thermal behavior. Py-GC/MS results suggested that the main constituents of biomass, i.e., hemicellulose, cellulose and lignin, suffer a progressive thermal degradation with increase in torrefaction temperature.

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Section: Py-gc/mssupporting

confidence: 82%

“…Additionally, the peak corresponding to cellulose degradation was affected during torrefaction but its position (365 °C) did not change visibly. This behavior might indicate that the structural characteristics of cellulose fraction of patula pine was preserved after torrefaction process (Park et al 2013). …”

Section: Py-gc/msmentioning

confidence: 96%

Effect of torrefaction temperature on properties of Patula pine

Ramos-Carmona

Pérez

Peláez-Samaniego

et al. 2017

Maderas, Cienc. tecnol.

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“…The authors also demonstrated that an increase in the torrefaction temperature elevated the mass fraction of carbon and decreased the hydrogen and oxygen content. Park et al [47], in their study, exhibited that the loss of VF is correlated to the thermal breakdown of carbohydrate fractions which amount to the accumulation buildup of ash after torrefaction. The study further illustrates that these alterations increase the FC content of the biomass, which complies well with the findings in this study.…”

Section: Proximate Analysismentioning

confidence: 99%

Thermal Pre-Treatment of Sewage Sludge in a Lab-Scale Fluidized Bed for Enhancing Its Solid Fuel Properties

Karki

Poudel

2018

Applied Sciences

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Thermal pre-treatment of non-lignocellulosic biomass, sewage sludge, using a lab-scale fluidized bed reactor was carried out in order to enhance its solid fuel properties. The influence of the torrefaction temperature range from 200-350 • C and 0-50 min residence time on the physical and chemical properties of the torrefied product was investigated. Properties of the torrefied product were analyzed on the basis of the degree of torrefaction, ultimate and proximate analysis, and gas analysis. An attempt was made to obtain the chemical exergy of sewage sludge. An elevated torrefaction temperature presented a beneficial impact on the degree of torrefaction and chemical exergy. Moreover, the effect of the torrefaction temperature and residence time on the elemental variation of sewage sludge exhibited an increase in the weight percentage of carbon while the H/C and O/C molar ratios deteriorated. Additionally, the product gas emitted during torrefaction was analyzed to study the pathway of hydrocarbons and oxygen containing compounds. The compounds with oxygen were emitted at higher temperatures in contrast to hydrocarbon gases. In addition, the study of various correlations for predicting the calorific value of torrefied sewage sludge was made.

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“…Fewer works deal with the torrefaction kinetics, however. [9][10][11][12][13][14][15] Most of these studies are based on isothermal experiments. Prins et al 9 and Bates et al 11 employed a one component, two step successive reaction model based on an earlier work of Di Blasi and Lanzetta 16 on xylan kinetics.…”

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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Transformation of lignocellulosic biomass during torrefaction

Cited by 181 publications

References 39 publications

Effect of torrefaction temperature on properties of Patula pine

Effect of torrefaction temperature on properties of Patula pine

Thermal Pre-Treatment of Sewage Sludge in a Lab-Scale Fluidized Bed for Enhancing Its Solid Fuel Properties

Thermal Decomposition Kinetics of Woods with an Emphasis on Torrefaction

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