Effects of temperature and holding time during torrefaction on the pyrolysis behaviors of woody biomass

Wannapeera, Janewit; Fungtammasan, Bundit; Worasuwannarak, Nakorn

doi:10.1016/j.jaap.2011.04.010

Cited by 298 publications

(139 citation statements)

References 20 publications

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“…Better agreement would be expected if the correlation was developed for a specific group of biomass, instead of a wide range. Bridgeman et al (2008) [ii] Peng et al (2013) [iii] Phanphanich & Mani (2011) [iv] Wannapeera et al (2011) [v] Chen et al (2011a [vi] Lu et al (2012) [vii] Yan et al (2009) [viii] [ix] Strandberg et al (2015) [x] Chen et al (2014b) [xi] Xue et al (2014) [xii] Grigiante & Antolini (2015) [xiii] Satpathy et al (2014) [xiv] Zheng et al (2013) [xv] Chen et al (2012) Bridgeman et al (2008) [ii] Peng et al (2013) …”

Section: Discussionmentioning

confidence: 99%

An Index for Quantifying the Degree of Torrefaction

Basu¹,

Kulshreshtha²,

Acharya³

2017

BioResources

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Torrefaction, a thermochemical pre-treatment process, is used to enhance the properties of biomass to make it more compatible with solid fossil fuels. A quantitative index (TI) is proposed here to define the degree or quality of torrefaction especially for its use in the energy industries. Torrefaction index is defined as the ratio of energy density enhancement factor of the product at the specified condition to that at a reference condition, which is torrefaction at 300 °C for 60 min. The index, calculated for a wide range of data shows a linear dependence on torrefaction temperature. Numerical values of this index were in range of 0.93 to 0.95, 0.95 to 0.97, and 0.97 to 1.0 for light, medium, and severe torrefaction conditions, respectively. Based on a wide range of experimental data of woody biomass, two empirical correlations for mass and energy yields were developed. These correlations permitted prediction of TI without performing torrefaction of the biomass.

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Section: Discussionmentioning

confidence: 99%

An Index for Quantifying the Degree of Torrefaction

Basu¹,

Kulshreshtha²,

Acharya³

2017

BioResources

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“…This effect might be due to the decomposition of the molecules with hydroxyl groups, releasing more water vapor. For instance, an increase in water vapor from 7.6 % to 17.8% was reported in Wannapeera et al (2011) when the torrefaction temperature increased from 200 °C to 275°C.…”

Section: Solid Product Yieldmentioning

confidence: 99%

“…The lignocellulosic biomass, in spite of all its positive attributes, is associated with the different shortcomings like structural heterogeneity, non-uniform physical properties, low energy density, hygroscopic nature, and low bulk density. These limitations create difficulties in transportation, handling, storage, and conversion processes (Arias et al, 2008;Phanphanich and Mani, 2011;Medic et al, 2011;Uemura et al, 2011;Wannapeera et al, 2011). These properties limit the use of biomass to replace fossil fuels for energy production.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Review on Biomass Torrefaction

Nhuchhen¹,

Basu²,

Acharya³

2014

IJREB

174

143

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Biomass is a versatile energy resource that could be used as a sustainable energy resource in solid, liquid and gaseous form of energy sources. Torrefaction is an emerging thermal biomass pretreatment method that has an ability to reduce the major limitations of biomass such as heterogeneity, lower bulk density, lower energy density, hygroscopic behavior, and fibrous nature. Torrefaction, aiming to produce high quality solid biomass products, is carried out at 200-300 °C in an inert environment at an atmospheric pressure. The removal of volatiles through different decomposition reactions is the basic principle behind the torrefaction process. Torrefaction upgrades biomass quality and alters the combustion behavior, which can be efficiently used in the co-firing power plant. This paper presents a comprehensive review on torrefaction of biomass and their characteristics. Despite of the number of advantages, torrefaction is motivated mainly for thermochemical conversion process because of its ability to increase hydrophobicity, grindability and energy density of biomass. In addition to this, torrefied biomass could be used to replace coal in the metallurgical process, and promoted as an alternative of charcoal.

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“…The wet torrefied sample contained an increased amount of cellulose and decreased amount of alkali metal inside the char, which resulted in a reduced amount of char residues. However, the increased residues for the dry torrefied sample were endorsed for the increased amount of acid and alkali metal fractions as ash residues (Wannapeera et al 2011).…”

Section: Proximate Analysismentioning

confidence: 99%

Comparative Evaluation of Physiochemical Properties of a Solid Fuel Derived from Adansonia digitata Trunk using Torrefaction

et al. 2017

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The effect of temperature on the physiochemical characteristics of a solid fuel or biocoal derived from the dried trunk of Adansonia digitata (Baobab) was studied using torrefaction processes. The chemical composition of the solid fuel or char obtained by wet (HTC) and dry torrefaction processes were determined by elemental and thermogravimetric (TGA) analyses. The Brunauer-Emmett-Teller (BET) surface area analyzer measured the porous texture and surface area of the prepared samples. The changes in the surface morphology and crystallinity of the prepared samples were evaluated by field-emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). The torrefaction process successfully improved the energy content from 16.8 MJ/kg to 22.0 MJ/kg, which was evidently higher than the starting precursors. The maximum energy yield obtained was 90.0% using dry torrefaction at 250 °C. The energy densification ratio was also higher for the char produced by the dry torrefaction process. However, the char produced by the HTC process at 250 °C showed the highest surface area. The pore diameter was higher for HTC-char produced at the same temperature. Overall the results revealed that the torrefaction of lignocellulosic biomass is beneficial for upgrading the fuel quality and energy densification of char residues.

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Effects of temperature and holding time during torrefaction on the pyrolysis behaviors of woody biomass

Cited by 298 publications

References 20 publications

An Index for Quantifying the Degree of Torrefaction

An Index for Quantifying the Degree of Torrefaction

A Comprehensive Review on Biomass Torrefaction

Comparative Evaluation of Physiochemical Properties of a Solid Fuel Derived from Adansonia digitata Trunk using Torrefaction

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