Effect of torrefaction on pinewood pyrolysis kinetics and thermal behavior using thermogravimetric analysis

He, Qing; Ding, Lu; Gong, Yan; Li, Weifeng; Wei, Juntao; Yu, Guangsuo

doi:10.1016/j.biortech.2019.01.138

Cited by 166 publications

(69 citation statements)

References 44 publications

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“…Torrefaction has been proposed as a process for thermal chemical conversion of various feedstocks to increase the heating value and make the material more friable (Chen and Kuo, 2011;Chen et al, 2015;Chen et al, 2019;He et al, 2018;He et al, 2019;Xu et al, 2018). The synergies between biomass and plastics during thermochemical conversion have also been well explored in the past decades (Chattopadhyay et al, 2008;Han et al, 2014;Olajire et al, 2014;Zhang et al, 2016;Burra and Gupta, 2018;Chen et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Bypassing Energy Barriers in Fiber-Polymer Torrefaction

Kolapkar

Zinchik

et al. 2021

Front. Energy Res.

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The amount of waste generation has been increasing with a significant amount being landfilled. These non-recyclable wastes contain large number of fiber and plastic wastes which can be treated with thermal processes to turn them into energy sources since they have high calorific values, are abundant and usually tipping fees are paid to handle them. This paper studied the torrefaction of non-recyclable paper (fiber) wastes, mixed plastic wastes (MPW) and their blends at different ratios in the temperature range of 250–400°C through thermogravimetric analysis (TGA). The solid residues after the experiments were analyzed by nuclear magnetic resonance (NMR) spectroscopy. Significant synergy between fiber and MPW were observed at the range 250–300°C, showing both increase in the reaction rate as well as the overall mass loss. At 250°C, the maximum mass loss rate was more than two times higher and the mass loss at the end of the experiments were also much higher compared to the expected results. In addition, synergy was weakened with an increase of temperature, disappearing at 400°C. The existence of such interactions between fiber and plastic wastes indicates that the natural energy barriers during the individual torrefaction in paper waste or plastic waste could be bypassed, and the torrefaction of fiber and plastic blend can be achieved at lower temperatures and/or shorter residence times. The MPW and fiber wastes were also compounded by extrusion (to produce pellets) at 220°C with different blend ratios. The fiber-MPW pellets from extrusion were characterized by IR spectroscopy, rheology, thermal analysis and flexural properties and showed significant chemical changes from the non-extruded blends at the same ratios. From IR characterization, it was found that there was significant increase in hydroxyl (OH) group on account of the carbonyl (C = O) and etheric (C-O-C) groups. The interaction between paper and MPW can be attributed to the plastic polymers acting as a hydrogen donor during the reactive extrusion process. Synergistic effects were also found from mechanical and rheological properties.

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Section: Introductionmentioning

confidence: 99%

Bypassing Energy Barriers in Fiber-Polymer Torrefaction

Kolapkar

Zinchik

et al. 2021

Front. Energy Res.

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“…Figure 4 shows the pyrolysis master plot of SF and SFap under two heating rates. The heating rate usually has little effect on master plot (Almazrouei and Janajreh 2020; He et al 2019a). In addition to heating rate, it was found that the pretreatment of HF pickling also had limited effect on master plot or reaction mechanism in this study.…”

Section: Pyrolysis Kineticsmentioning

confidence: 59%

Effect of ash removal on structure and pyrolysis/gasification reactivity of a Chinese bituminous coal

Gong

Ding

et al. 2020

Int J Coal Sci Technol

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In this study, the effect of ash removal on Shenfu bituminous coal was investigated. The coal was pretreated by hydrofluoric acid (HF) pickling, and the raw/pretreated coal chars were prepared at 900 °C in a fixed bed reactor. The structure of coal and char were detected by Fourier transform infrared (FTIR) and Raman spectroscopy. The reactivity was tested in a thermogravimetric analyzer, including coal pyrolysis and char gasification. The reaction kinetics was analyzed through the Coats–Redfern method, master plots, the model-free and model-fitting method. The results show that the HF pickling can remove silicon from coal efficiently, and the macromolecular framework of coal is quite stable according to FTIR. The Raman parameters imply some carbonaceous structure on coal surface changed. For slow pyrolysis of coal, the effect of heating rate is considered. The changes of pyrolysis characteristics and kinetics are insignificant. For char gasification, the reactivity under isothermal and non-isothermal condition are discussed with an emphasis in different residence time of devolatilization process. In kinetic control region (low temperature), the activation energy (Ea) is very close (about 240 kJ/mol) for all chars. With the temperature increases, the reactivity of raw coal char is more easily suffered by diffusion. The random pore model is more suitable for the ash-free coal char, and the char with long residence time has a larger value of structural parameter ψ and smaller value of pre-exponential factor A. The Ea calculated by model-fitting and model-free method were in good agreement.

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“…Jiang et al 13 reported that the presence of iron was favorable to the persistence of more catalysts in active forms during gasification by way of suppressing the vaporization of sodium and the formation of crystalline Na 2 CO 3 . 12,19 The structural evolution would undergo different pathways accordingly. In most cases, co-utilization was conducive to the improvement of carbon conversion rate.…”

Section: Introductionmentioning

confidence: 99%

“…Co-pyrolysis and co-gasification were widely studied to improve the utilization efficiency of carbonaceous resources. 12,13,[19][20][21] Also, research showed that pyrolysis improved the carbon structure of coal char and increased specific surface area. [14][15][16] The ash component usually played a catalytic role in gasification.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, it was found that the reaction characteristics of carbonaceous could be changed after pretreatment, such as liquefaction and torrefaction. 12,19 The structural evolution would undergo different pathways accordingly. 12,13,[19][20][21] Also, research showed that pyrolysis improved the carbon structure of coal char and increased specific surface area.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A study on high‐temperature co‐gasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue

Guo

Huang

Gong

et al. 2019

Asia-Pacific J Chem Eng

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In this study, the rapid pyrolysis chars of Hami bituminous coal and its liquefaction residue were prepared using a high-frequency furnace. A thermogravimetric analyzer was used to investigate the gasification reactivity and determine the mixing ratio of coal and its liquefaction residue. In addition, a scanning electron microscope, a physisorption analyzer, and a laser raman spectrometer were used to characterize the physicochemical properties of samples. Furthermore, kinetics analysis using the isoconversional method was conducted. The results showed that the gasification reactivity was affected by gasification temperature, pore structure, and carbon structure. When the gasification temperature increased to 1300°C, the gasification reactivity of the liquefaction residue char was close to that of coal char. From the gasification reactivity point of view, the liquefaction residue could be utilized as a raw material in entrained-flow gasification. The mixing ratio of the raw coal to the liquefaction residue was preferably 2:1. The research on activation energy showed that the gasification process belonged to pore diffusion control in the range of temperatures investigated. Specifically, there was a synergistic effect between the coal char and the liquefaction residue char in co-gasification, which was beneficial to the gasification reaction. study on high-temperature cogasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue. Asia-Pac J Chem Eng. 2020;15:e2376. https://doi.

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Effect of torrefaction on pinewood pyrolysis kinetics and thermal behavior using thermogravimetric analysis

Cited by 166 publications

References 44 publications

Bypassing Energy Barriers in Fiber-Polymer Torrefaction

Bypassing Energy Barriers in Fiber-Polymer Torrefaction

Effect of ash removal on structure and pyrolysis/gasification reactivity of a Chinese bituminous coal

A study on high‐temperature co‐gasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue

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