Torrefaction and co-torrefaction characterization of hemicellulose, cellulose and lignin as well as torrefaction of some basic constituents in biomass

Chen, Wei‐Hsin; Kuo, Po-Chih

doi:10.1016/j.energy.2010.12.036

Cited by 470 publications

(223 citation statements)

References 26 publications

Supporting

Mentioning

203

Contrasting

Unclassified

Order By: Relevance

“…6,7 The extractives of the biomass also decompose while the cellulose and lignin are moderately impacted during torrefaction, depending on the feedstock composition and the torrefaction temperature. 8 Many studies are available on the production and characterization of torrefaction products. Fewer works deal with the torrefaction kinetics, however.…”

Section: Introductionmentioning

confidence: 99%

Thermal Decomposition Kinetics of Woods with an Emphasis on Torrefaction

et al. 2013

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal Decomposition Kinetics of Woods with an Emphasis on Torrefaction

et al. 2013

View full text Add to dashboard Cite

show abstract

“…8, the curve area of raw straw is large, with two overlap peaks at 300 and 350°C , which stand for the thermal decomposition of hemicellulose and cellulose, respectively [15]. Biomass with high moisture content (20%) has small covered area.…”

Section: Characteristics Of the Torrefied Biomassmentioning

confidence: 99%

“…5. According to Chen and Kao [15], slight weight loss (less than 10%) at temperature below 200°C was due to the release of moisture and some light volatiles. Significant weight loss was observed at temperature between 200 and 500°C due to thermal decomposition of hemicellulose, cellulose and lignin, which can be confirmed in the DTG curves in Fig.…”

Section: Characteristics Of the Torrefied Biomassmentioning

confidence: 99%

Effects of Microwave － Induced Torrefaction on Waste Straw Upgrading

Lin¹,

林怡利²

2015

IJCEA

View full text Add to dashboard Cite

Abstract-This study focused on upgrading waste straw by developing the technology of microwave-imduced torrefaction and investigating the key operating parameters to improve the energy density and hydrophobicity of biomass for better feedstock for the production of renewable energy. The experiments were conducted under inert environment and atmospheric pressure in a fixed-bed batch reactor putting in a self-designed microwave facility. Factors including microwave power (250 to 450 W), reaction time (10 to 30 min) and moisture content (8 to 50%) were evaluated and the torrefaction temperature was monitored and controlled in the range of 200 to 300 ℃. It was found that the shape and fullness of the reactor as well as the position and direction of the thermocouple in the microwave facility significantly affected the efficacy of microwave-induced torrefaction, while the influences of nitrogen flow-rate and moisture content of the biomass were negligible. With the increase of microwave power from 250 to 450 W, the content of fixed carbon and ash, higher heating value (HHV) and energy density increased in the torrefied straw. TGA and DTG confirmed the evaporation of moisture as well as the decomposition of hemicellulose and cellulose in biomass structures, and microwave power was the key factor affecting the torrefaction temperature so as to the energy yield and density of torrefied biomass. Straw torrefied under 450 W for 30 min showed characteristics similar to those of blended coal with HHV approaching to that of bituminous coal. With further optimization of microwave torrefaction parameters (power and reaction time), torrefied straw has potential for the substitution of coal used in pulverized coal-fired furnace.Index Terms-Microwave-induced torrefaction, rice straw, energy density, thermogravimetric analysis.

show abstract

“…Hemicellulose is an amorphous chain of polysaccharides containing sugar residues and it protects the cellulose fibrils from enzymatic deconstruction [5]. Lignin without sugar-based structure is an amorphous polymer made up of aromatic derivatives [6].…”

Section: Introductionmentioning

confidence: 99%

Variation of Particle Size and Pretreatment Temperature to the Crystallinity of Leucaena Leucocephala

et al. 2016

View full text Add to dashboard Cite

Abstract. This study was conducted in order to determine the effect of different particle size and pretreatment temperature to the crystallinity of leucaena leucocephala. The leucaena was pretreated by ionic liquid [1-ethyl-3 methylimidazolium acetate [Emim]Ac. There were three different particle sizes that have been tested in this experiment; less than 0.3 mm, 0.5 mm and 0.7 mm. In the other hand, the pretreatment temperature tested were 30℃, 60℃ and 90℃. The effect of particle size and pretreatment temperature to the crystallinity of leucaena was investigated by using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The crystallinity index of the sample represents the percentage of crystalline materials. A lower in the cristallinity index indicated that the material has lower crystillinity, hence give more benefit to the cellulose hydrolysis. From XRD analysis, it shows that the cristallinity index of leucaena decreased with decreasing particle size and increasing pretreatment temperature. SEM analysis also shows that the structure of leucaena has more irregular, porous and destroyed structure with decreasing particle size and increasing pretreatment temperature. Thus, the result from this experiment shows that the smaller particle size and higher pretreatment temperature would provide a more accessible surface area to enhance the cellulose hydrolysis.

show abstract

Torrefaction and co-torrefaction characterization of hemicellulose, cellulose and lignin as well as torrefaction of some basic constituents in biomass

Cited by 470 publications

References 26 publications

Thermal Decomposition Kinetics of Woods with an Emphasis on Torrefaction

Thermal Decomposition Kinetics of Woods with an Emphasis on Torrefaction

Effects of Microwave － Induced Torrefaction on Waste Straw Upgrading

Variation of Particle Size and Pretreatment Temperature to the Crystallinity of Leucaena Leucocephala

Contact Info

Product

Resources

About