Evaluation of the structure and fuel properties of lignocelluloses through carbon dioxide torrefaction

Li, Mingfei; Chen, Le-Xuan; Li, Xun; Chen, Chang-Zhou; Lai, Yi-Chao; Xiao, Xiao; Wu, Yijian

doi:10.1016/j.enconman.2016.04.064

Cited by 62 publications

(21 citation statements)

References 39 publications

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“…These results indicated the role of pelletizing process that may help extractives to migrate to the particles surface and so facilitate further removal of volatile and tar cracking. Unlike torrefaction‐only pretreatment that may result in less volatile removal and tar cracking during pyrolysis, resulting in reduction of pore volume and surface area and so reducing the char gasification reactivity …”

Section: Resultsmentioning

confidence: 99%

“…Unlike torrefaction-only pretreatment that may result in less volatile removal and tar cracking during pyrolysis, resulting in reduction of pore volume and surface area and so reducing the char gasification reactivity. 48,49 However, it should be noted that other factors could contribute to the apparent differences in the reactivity. Reactivity can be affected by the char obtained by the secondary reaction, which is partly responsible for the loss of reactivity.…”

Section: Gasification Reactivitymentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Gasification Reactivitymentioning

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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“…During the torrefaction, biomass is heated directly or indirectly by means of water vapour as a heating source. The process can be controlled by means of temperature, rotating speed, length and angle of the drum [144][145][146][147][148][149][150] . The advantages and disadvantages of the reactors are summarised in Table 9 [145] .…”

Section: Hydrothermal Pretreatmentmentioning

confidence: 99%

Biomass pyrolysis: A review of the process development and challenges from initial researches up to the commercialisation stage

Gholizadeh

2019

Journal of Energy Chemistry

500

216

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“…Meng et al (2012) studied the torrefaction pretreatment of loblolly pine and determined that torrefaction could be a potential upgrading method to improve the quality of bio-oil, to reduce the ratio of O/C in bio-oil, and to increase the content of pyrolysis lignin, which might be a useful feedstock for phenolic-based chemicals. Li et al (2016) discussed the effect of torrefaction temperature and residual time on the properties of biomass and proposed that as the content of cellulose and hemicellulose decreased, the lignin content and caloric value increased significantly; they also demonstrated that hydrophobicity was enhanced with an increase of torrefaction temperature and residual time. Chen et al (2016) observed that a higher yield of bio-char and a lower yield of bio-oil were obtained with an increase in torrefaction temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Torrefaction Temperature on the Structural Properties and Pyrolysis Behavior of Biomass

Zheng¹,

Tao²,

Yang³

et al. 2017

BioResources

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To improve prospects for high-value utilization of biomass, torrefaction pretreatments were conducted at 210, 230, 250, 270, and 300 °C with a reaction time of 30 min. The pyrolysis of torrefied biomass was also performed on a fixed-bed reactor system at 450 °C. The effect of torrefaction temperature on the yield, energy yield, structure, physicalchemical characteristics, and production composition of bio-oil was studied. The torrefaction pretreatment improved the fuel characteristics of pyrolysis products. When the torrefaction temperature was increased, the -OH and C=O contents decreased, the C=C contents increased, the pyrolysis peak temperature decreased, the residual carbon contents noticeably increased, and the Ea value remained in the range of 69 to 129 kJmol -1. The pore volume increased and the crystallinity index decreased due to degradation and recrystallization. The solid yield of pyrolysis biomass decreased sharply in contrast to the liquid yield. When the torrefaction temperature increased, the bio-oil yield decreased from 36.82 wt.% to 20.13 wt.%. The phenol content in the bio-oil markedly increased; however, oxygen-containing compounds such as acids, sugars, and furans, significantly decreased, which indicated that torrefaction pretreatment efficiently improved the quality of the fuel.

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Evaluation of the structure and fuel properties of lignocelluloses through carbon dioxide torrefaction

Cited by 62 publications

References 39 publications

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

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

Biomass pyrolysis: A review of the process development and challenges from initial researches up to the commercialisation stage

Effect of the Torrefaction Temperature on the Structural Properties and Pyrolysis Behavior of Biomass

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