Pyrolysis characteristics and kinetics of biomass torrefied in various atmospheres

Bach, Quang‐Vu; Trinh, Trung Ngoc; Tran, Khanh-Quang; Thi, Ngoc Bao Dung

doi:10.1016/j.enconman.2016.04.097

Cited by 98 publications

(30 citation statements)

References 38 publications

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“…Volatile and char yields [194] intrinsic pyrolysis kinetics of the three biopolymers but only their contribution factors [202]. Therefore, the estimation of intrinsic kinetic parameters for co-pyrolysis of torrefied biomass and coal should be possible if intrinsic parameters are available for individual pyrolysis of raw biomass and coal.…”

Section: Progress On Co-pyrolysis Kineticsmentioning

confidence: 99%

Co-pyrolysis of coal and raw/torrefied biomass: A review on chemistry, kinetics and implementation

Gouws

Carrier

Bunt

et al. 2021

Renewable and Sustainable Energy Reviews

131

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Thermochemical conversion via co-pyrolysis has the potential to be an efficient route for converting biomass to bio-energy and bio-refinery products. In this review, the implementation of co-pyrolysis of torrefied biomass and coal was critically assessed against co-pyrolysis of raw biomass and coal from both a fundamental and engineering perspective. This evaluation showed fundamental advantages for torrefaction of biomass prior to copyrolysis such as a decrease in mass and heat transfer limitations due to an increase in permeability and thermal conductivity of biomass. Co-pyrolysis volatiles may also be upgraded through the catalytic activity of the torrefied biomass surface, producing higher quality oil. Due to properties more similar to coal, torrefied biomass requires less energy for milling (lower operating costs) and can be more easily blended with coal in reactor feeding systems. A state-of-the-art research on co-pyrolysis kinetics revealed that reactivities of blends may be predicted from kinetic parameters of individual feedstocks using an additive approach. To conclude on the preferred reactor design for this process, different reactors were evaluated based on heat transfer mode, operation and product formation. Although both the fluidized bed and rotating cone reactor provide high oil yields, the rotating cone has been more successful commercially. This design shows great promise for specifically copyrolysis due to the intimate contact that may be achieved between fuels to maximize synergy. The copyrolysis of torrefied biomass and coal may be encouraged from a scientific point of view, however further research is recommended on the effective integration of torrefaction and co-pyrolysis technologies.

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Section: Progress On Co-pyrolysis Kineticsmentioning

confidence: 99%

Co-pyrolysis of coal and raw/torrefied biomass: A review on chemistry, kinetics and implementation

Gouws

Carrier

Bunt

et al. 2021

Renewable and Sustainable Energy Reviews

131

View full text Add to dashboard Cite

show abstract

“…From the kinetics perspective, it was reported that the torrefaction temperature has significant effects on kinetics data . Among the reactions occurring inside gasifiers, CO 2 −char gasification represents the rate determination step.…”

Section: Introductionmentioning

confidence: 99%

Influence of torrefaction after densification on the fuel characteristics and the inherited gasification kinetics of Erianthus arundinaceus energy grass

Qadi

Kobayashi

Takeno

2019

Env Prog and Sustain Energy

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In this study, a mixture of breeding lines of Erianthus arundinaceus energy grass was pretreated prior to gasification. Although biomass torrefaction and subsequent pelletizing of torrefied biomass (TOP process) have been studied in details, the torrefaction of pellets (TAP process) still in its infancy. Therefore, samples prepared by TAP, torrefaction‐only and pelletizing‐only were compared in terms of fuel characteristics and gasification kinetics. Results showed that the mass yield decreased with increasing torrefaction temperature, whereas the higher heating value (HHV) continued to increase with temperature, which can be seen in the evolution of O/C and H/C atomic ratios. Tradeoff between mass yield and HHV points to 250°C as the optimum torrefaction temperature, as mass yield above 76% could be achieved. TAP process was superior not only in terms of producing fuel with higher energy density, but also the gasification reactivity was higher than that of torrefied‐only or densified‐only samples, suggesting TAP is promising to be employed within the gasification process. Yet, conducting TAP under higher torrefaction temperatures may weaken the reactivity due to the more release of potassium during pyrolysis. Lastly, gasification kinetics data revealed that the pretreated samples exhibited slightly higher activation energy.

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“…In the different oxygen concentration ranges of 3% to 9%, the solid yield gradually decreased as oxygen concentration increased, and the mass yields of liquid and gas showed opposite tendencies. This was mainly because many volatiles were previously released during the torrefaction process, and thermal cracking and oxidative reactions occurred under oxygen atmosphere (Bach et al 2017;Chen et al 2018a).…”

Section: Analysis Methodsmentioning

confidence: 99%

Effect of torrefaction temperature and O2 concentration on the pyrolysis behaviour of moso bamboo

Sun

Sun²,

Chen³

et al. 2020

BioRes

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Five-year-old moso bamboo was torrefied under nitrogen and different oxygen concentrations of 3% to 9% and torrefaction temperatures of 200 °C to 300 °C. Mass yields of 31.7% to 96.6%, energy yields of 30.8% to 98.9%, and higher heating values (HHVs) in the range 18.8 to 27.1 MJ/kg were obtained. The torrefied sample was characterized by Fourier transform infrared spectrometry (FTIR). Under the different torrefaction temperatures and oxygen concentrations, hemicellulose and cellulose were thermally decomposed, which led to significant changes in the chemical functional groups of the raw and torrefied bamboo. The pyrolysis experiments on raw and torrefied bamboo were conducted using the pyrolyzer coupled with a gas chromatography/mass spectrometer (Py-GC/MS). According to the Py-GC/MS analysis, the pyrolytic bio-oil were mainly composed of acids, furans, phenols, ketones, aldehydes, esters, alcohols, and hydrocarbons. Higher torrefaction temperature reduced the relative contents of acids, ketones, furans, and aldehydes. However, lower torrefaction temperatures and moderate oxygen concentrations were optimal for the production of phenols and hydrocarbons.

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Pyrolysis characteristics and kinetics of biomass torrefied in various atmospheres

Cited by 98 publications

References 38 publications

Co-pyrolysis of coal and raw/torrefied biomass: A review on chemistry, kinetics and implementation

Co-pyrolysis of coal and raw/torrefied biomass: A review on chemistry, kinetics and implementation

Influence of torrefaction after densification on the fuel characteristics and the inherited gasification kinetics of Erianthus arundinaceus energy grass

Effect of torrefaction temperature and O2 concentration on the pyrolysis behaviour of moso bamboo

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