Impact of torrefaction on thermal behavior of wheat straw and groundnut stalk biomass: Kinetic and thermodynamic study

Gajera, Bhautik; Tyagi, Uplabdhi; Sarma, Anil Kumar; Jha, Mithilesh Kumar

doi:10.1016/j.jfueco.2022.100073

Cited by 35 publications

(7 citation statements)

References 35 publications

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“…This trait was consistent with Kaur, Gera [ 98 ]. Both pellets in peak 1 (first zone) gave the lowest value for all thermodynamics parameters; this result agreed with the research output of Naqvi, Ali [ 125 ] and Gajera, Tyagi [ 126 ]. The reaction is endothermic and releases energy, as seen by the reaction's negative enthalpy value.…”

Section: Resultssupporting

confidence: 89%

Kinetic mechanism of wheat straw pellets combustion process with a thermogravimetric analyser

Nath,

Chen,

Bowtell

et al. 2023

Heliyon

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Section: Resultssupporting

confidence: 89%

Kinetic mechanism of wheat straw pellets combustion process with a thermogravimetric analyser

Nath,

Chen,

Bowtell

et al. 2023

Heliyon

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“…The enthalpy of biomass pyrolysis is a crucial thermal property for designing the thermal reactor and estimating the yield of the pretreatment process. [71]. Table 6 summarizes that approximately 203.023 kJ/mol and 191.51 kJ/mol; 247.866 kJ/mol and 216.64 kJ/mol of thermal energy is needed for raw (sesame stalks and bean husk), respectively using CR and DA method, while 112.45 kJ/mol and 91.74 kJ/mol; 156.029 kJ/ mol and 101.05 kJ/mol of heat energy is required for torrified (sesame stalks and bean husk) at 300 °C, respectively by utilizing CR and DA techniques.…”

Section: Thermodynamic Parametersmentioning

confidence: 99%

“…Torrified biomass (TSS and TBH) have high levels of usable internal energy, suggesting they could be seriously evaluated as a source of energy generation. [71].…”

Section: Thermodynamic Parametersmentioning

confidence: 99%

The influence of torrefaction on the biochar characteristics produced from sesame stalks and bean husk

Khairy

Amer

Ibrahim

et al. 2023

Biomass Conv. Bioref.

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Torrefaction encourages homogeneity and enhances the energy-producing capabilities of biomass. In the current study, bean husk (BH) and sesame stalks (SS) were torrefied for 30 and 60 min at operating temperatures of 200, 225, 250 and 275, and 300 °C with nitrogen purging. Mass yield (MY), higher heating value (HHV), energy yields (EY), and torrefaction severity index (TSI) were examined. The variations of the biochar characteristics, pyrolysis kinetics by applying two models (Coats and Redfern (CR) and Direct Arrhenius (DA)), and crystallinity index (CRI) were depicted. Depending on pyrolysis kinetics, thermodynamic activation parameters were derived to elucidate biomass pyrolysis. The alterations in the torrefied materials’ composition were also analyzed using Fourier transform infrared spectroscopy (FTIR). The calculations revealed that the torrefied SS and BH decreased MY by 32.74, 29.02% and decreased EY 26, 20.97%, increased high heating values by 14.1, 13.52%, increased fixed carbon by 55.1, 39.91% respectively, and had a slight reduction in bulk density (approximately 2%). Generally, 275 °C and 30 min were the optimal conditions for a balanced torrefaction of SS and BH based on the HHV that reached to 20.5, 16.2 MJ/kg and EY that reached to 86.16 and 85.56% respectively. The FTIR, XRD, and the thermogravimetric results showed that the torrefaction treatment altered samples owing to carbohydrate breakdown, a rise in lignin, and a reduction in hemicellulose as the temperature of the torrefaction process increased. The CR methodology yielded greater frequency factor (A) and activation energy (Ea) values than the DA method. The broadest peak width, lowest average Ea, and lnA were seen in sesame stalks that had been torrefied at 300 °C and 30 min that reached to 107.85 (kJ/mol) and 13.57 (min−1). Results indicated an excellent linear relationship with the index of comprehensive pyrolysis (CPI), CRI, atomic H/C ratio, severity index, and EY.

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“…It has been demonstrated that several factors impact the pyrolysis of straw, including straw pretreatment methods and the pyrolysis environment. Gajera B et al examined the pyrolysis characteristics of pretreated straw in an inert gas environment [12], while Wang et al explored the synergistic effects of co-pyrolyzing different straws and waste tires in a nitrogen gas environment [13]. External factors that have been studied include, but are not limited to, the catalytic pathway [14], the size of biomass particles [15], the gaseous environment in which pyrolysis occurs [16], and the co-pyrolysis of multiple materials [17].…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis Behavior and Kinetics of Typical Crop Straw in Henan Province at Different Heating Rates

Hu,

Hou,

Lan

et al. 2023

Processes

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Straw, which is characterized by its low cost, large quantity, and rich supply of biomass energy, is often converted into energy that can be utilized in industrial production through pyrolysis technology. This paper examines the pyrolysis experiments of four kinds of straw (rice, wheat, peanut, and corn) from the Henan Province of China, conducted in an air environment with varying temperature-rise rates. Based on the experimental results, an analysis was conducted on the effect of the rate of temperature rise on the degree of straw pyrolysis and the pyrolysis characteristics of each type of straw. The activation energies of the pyrolysis reactions were calculated utilizing the Kissinger–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), and Starink methods. It was concluded that the pyrolysis process of all four types of straw could roughly be classified into three stages: dehydration and drying stage, volatile release stage, and carbonization stage. Among the four types of straw evaluated, rice straw exhibited the most favorable combustion performance, while wheat straw demonstrated the best pyrolysis effect. Increasing the heating rate resulted in a pronounced thermal hysteresis effect during the straw’s pyrolysis, as evidenced by the TG and DTG curves shifting toward higher temperatures. The reaction speed increased as the heating rate increased, and the amount of residual carbon displayed an upward trend.

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Impact of torrefaction on thermal behavior of wheat straw and groundnut stalk biomass: Kinetic and thermodynamic study

Cited by 35 publications

References 35 publications

Kinetic mechanism of wheat straw pellets combustion process with a thermogravimetric analyser

Kinetic mechanism of wheat straw pellets combustion process with a thermogravimetric analyser

The influence of torrefaction on the biochar characteristics produced from sesame stalks and bean husk

Pyrolysis Behavior and Kinetics of Typical Crop Straw in Henan Province at Different Heating Rates

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