Influence of torrefaction pretreatment on corncobs: A study on fundamental characteristics, thermal behavior, and kinetic

Tian, Xiaojie; Dai, Leilei; Wang, Yunpu; Zeng, Zihong; Zhang, Shumei; Jiang, Lin; Yang, Xiuhua; Yue, Linqing; Liu, Yuhuan; Ruan, Roger

doi:10.1016/j.biortech.2019.122490

Cited by 98 publications

(34 citation statements)

References 30 publications

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“…On the other hand, the DTG peak of hemicellulose became smaller for torrefied materials, which confirmed the large loss of hemicellulose content during torrefaction. Similar observations were found in the study performed on corn cob torrefaction [8]. However, the weight of torrefied samples in the second stage decreased by approx.…”

Section: The Thermal Degradation Processsupporting

confidence: 90%

“…Biomass is considered to be the most promising alternative to fossil fuel energy due to its specific characteristics [5], such as renewability, reproducibility, carbon neutrality, low cost, and abundant reserves [6,7]. Generally, biomass can be converted into three main product types: electrical/heat energy, transport fuel, and chemical feedstock to form solid, liquid, and gaseous products [8]. To obtain these products, thermochemical, biochemical, or physicochemical technological routes must be followed [9].…”

Section: Introductionmentioning

confidence: 99%

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Determination of the Kinetics and Thermodynamic Parameters of Lignocellulosic Biomass Subjected to the Torrefaction Process

et al. 2021

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The torrefaction process upgrades biomass characteristics and produces solid biofuels that are coal-like in their properties. Kinetics analysis is important for the determination of the appropriate torrefaction condition to obtain the best utilization possible. In this study, the kinetics (Friedman (FR) and Kissinger–Akahira–Sunose (KAS) isoconversional methods) of two final products of lignocellulosic feedstocks, miscanthus (Miscanthus x giganteus) and hops waste (Humulus Lupulus), were studied under different heating rates (10, 15, and 20 °C/min) using thermogravimetry (TGA) under air atmosphere as the main method to investigate. The results of proximate and ultimate analysis showed an increase in HHV values, carbon content, and fixed carbon content, followed by a decrease in the VM and O/C ratios for both torrefied biomasses, respectively. FTIR spectra confirmed the chemical changes during the torrefaction process, and they corresponded to the TGA results. The average Eα for torrefied miscanthus increased with the conversion degree for both models (25–254 kJ/mol for FR and 47–239 kJ/mol for the KAS model). The same trend was noticed for the torrefied hops waste samples; the values were within the range of 14–224 kJ/mol and 60–221 kJ/mol for the FR and KAS models, respectively. Overall, the Ea values for the torrefied biomass were much higher than for raw biomass, which was due to the different compositions of the torrefied material. Therefore, it can be concluded that both torrefied products can be used as a potential biofuel source.

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Section: The Thermal Degradation Processsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Determination of the Kinetics and Thermodynamic Parameters of Lignocellulosic Biomass Subjected to the Torrefaction Process

et al. 2021

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“…These numbers were also in similar ranges compared to the literature. 28,29 With torrefaction, thermo-chemical decomposition of agro-residues occurs via reactions of dehydration, initial devolatilization, and/or decarboxylation. 30 The three main compounds of lignocellulosic biomass generally respond to this decomposition at different temperature ranges.…”

Section: Resultsmentioning

confidence: 99%

Bio-oils from vacuum ablative pyrolysis of torrefied tobacco residues

et al. 2020

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“…Based on the results of the TGA, the torrefaction was conducted between 200 and 300 • C. Previous torrefaction studies on corncob performed particle reduction before torrefaction [26][27][28][29][30][31][32]34,36,37], and reports have shown that particle size does not significantly affect the torrefaction process; therefore, the corncob was torrefied as received [11]. Therefore, in this study, the corncob was torrefied without performing particle reduction.…”

Section: Torrefaction Experimentsmentioning

confidence: 99%

“…Studies have been carried out on investigating combustion properties of corncob biomass from different origins via torrefaction, pyrolysis, and gasification for energy application. These include corncob of China [26][27][28][29][30], Taiwan [31], South Africa [32], Canada [33], Malaysia [34] and Nigeria [35][36][37] origins. However, there is still a need for further studies on the torrefaction of corncob for energy applications.…”

Section: Introductionmentioning

confidence: 99%

Improving the Combustion Properties of Corncob Biomass via Torrefaction for Solid Fuel Applications

et al. 2021

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The overdependence on fossils as the primary energy source has led to climate change, global warming, and the emission of greenhouse gas. As a result, the United Nations, while setting the goals for the year 2030, has made the provision of a green environment and energy one of the top priorities. In this study, the suitability of corncob for green energy production was investigated. The improvement of corncob’s thermal and combustion properties via the torrefaction process was considered for solid fuel applications. The raw corncob was collected, sorted, and dried for seven days before being used for the torrefaction experiment. Different torrefaction temperatures (200, 240, and 260 °C) and residence times (20, 40, 60 min) were studied. There was no particle reduction—samples were torrefied as collected (whole corncob). The results show that torrefaction temperature and residence time affect the torrefaction products yields along with their properties. Thermal and combustion properties were improved with an increase in torrefaction temperature and residence time. The higher heating value and energy density of the torrefied corncob varied between 17.26 and 18.89 MJ/kg, and 3.23 and 5.66 GJ/m3, respectively. High torrefaction temperature and residence time lead to low solid yield; however, liquid and gas yields increase with torrefaction temperature and residence time. The solid yields varied from 27.57 to 52.23%, while the liquid and gas yields varied from 31.56 to 44.78% and 16.21 to 27.65%, respectively. The properties of corncob improve after torrefaction and are suitable for solid fuel application.

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Influence of torrefaction pretreatment on corncobs: A study on fundamental characteristics, thermal behavior, and kinetic

Cited by 98 publications

References 30 publications

Determination of the Kinetics and Thermodynamic Parameters of Lignocellulosic Biomass Subjected to the Torrefaction Process

Determination of the Kinetics and Thermodynamic Parameters of Lignocellulosic Biomass Subjected to the Torrefaction Process

Bio-oils from vacuum ablative pyrolysis of torrefied tobacco residues

Improving the Combustion Properties of Corncob Biomass via Torrefaction for Solid Fuel Applications

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