Study of co-pyrolysis kinetics, synergetic effects, and thermodynamics of coal and biomass blends

Prabhakar, Ashok; Sadhukhan, Anup Kumar; Gupta, Parthapratim

doi:10.1080/15567036.2022.2106326

Cited by 4 publications

(3 citation statements)

References 52 publications

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“…Thermodynamic parameters are significant in expressing the total heat content of a system during the combustion process. Thermodynamic parameters such as the exponential factor (A), enthalpy ( H), Gibbs free energy ( G), and entropy ( S) are expressed using the following equations [44,45]:…”

Section: Computational Methods Of Thermodynamic Parametersmentioning

confidence: 99%

The Combustion of Forest Humus Blended with Low-Rank Coal: Effects of Oxygen Ratio and Blending Ratio

Zhou,

Zhang,

Lou

et al. 2023

Processes

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In this study, the combustion characteristics of pine needles, pine needle humus, and the co-combustion of these two types of biomass with coal were compared. In addition, the optimization of the combustion performance of coal/humus was assisted through the following studies: (i) the combustion performance of coal/pine needle humus was studied under four different oxygen concentrations (N2, 10%O2/90%N2, 20%O2/80%N2, and 40%O2/60%N2); (ii) the synergistic effect between the humus and coal during combustion was also investigated by adjusting the blending ratio and oxygen content; (iii) the mechanisms of the optimized combustion processes were expounded by kinetics and thermodynamics discussion. The results demonstrated that the combustion characteristics of the coal/humus blends were found to be higher than those of the coal/pine needle blends. The coupling interactions of the oxygen content and blending ratio contributed to the significant synergistic effect between the two fuels, and the synergistic effect showed a nonlinear variation with an increased oxygen concentration. The synergistic effect in a rich oxygen environment (O240%/N260%) is 5.1 times greater than that in the synthetic air (O220%/N280%) and 13.8 times greater than that in the oxygen-poor environment (O210%/N290%). Hence, the blending ratio could be adjusted to maintain the intensity of the synergistic effect in an oxygen-rich atmosphere.

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Section: Computational Methods Of Thermodynamic Parametersmentioning

confidence: 99%

The Combustion of Forest Humus Blended with Low-Rank Coal: Effects of Oxygen Ratio and Blending Ratio

Zhou,

Zhang,

Lou

et al. 2023

Processes

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“…According to the coal pyrolysis process, some scholars proposed its influencing factors and refined different factors. In order to further improve the tar yield during coal pyrolysis, some scholars proposed the theory of dissociation of noncovalent and weakly covalent bonds in the coal structure, which suggests that the free radicals can be secondary reacted through polymerization and recombination after they are produced, and these reactions can help to increase the tar yield and quality and reduce the asphaltene reaction [10]. Some scholars injected hydrogen during the pyrolysis reaction to obtain more hydrogen radicals at high temperatures and reduced the polymerization reaction between macromolecular radicals by stabilizing these radicals, thus achieving the purpose of improving tar quality [11].…”

Section: Related Workmentioning

confidence: 99%

Application of Ni/MgO catalysts in the pyrolysis of bituminous coal

Zheng,

Wang,

et al. 2024

Applied Mathematics and Nonlinear Sciences

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Carbon pyrolysis is one of the essential ways to improve carbon energy utilization and reduce environmental pollution. The main product of carbon pyrolysis process is tar, and improving tar yield can not only increase the resource utilization efficiency, but also reduce the pollution to the environment. Therefore, this paper investigates the application of Ni/MgO catalyst in the pyrolysis process of bituminous coal. The experimental results show that Ni/MgO catalyst can effectively activate small molecule radicals and make them combine with prominent molecule radicals stably to improve the tar yield. Meanwhile, when it is under the pyrolysis gas environment, pyrolysis temperature reaches 570 ℃, gas flow rate is 375 ml/min, and the catalyst is selected to be filled in the upper layer, the activation effect of Ni/MgO catalyst is more prominent, and it can significantly increase the tar yield and the proportion of light oil. Ni/MgO catalyst had the best effect in tar yield increase compared to other catalysts, but the performance was average in fair oil percentage increase. The catalyst could also reduce the number of aliphatics in the tar and increase the proportion of non-aliphatics, improving the tar quality.

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“…For instance, Lu et al 19 investigated the co-pyrolysis characteristics of sawdust and anthracite without any interaction during the process. Prabhakar et al 20 studied the thermochemical conversion, reaction kinetics, and thermodynamic behavior of coal/rice husk co-pyrolysis. They had also not observed any synergistic effect.…”

Section: Introductionmentioning

confidence: 99%

Co-pyrolysis Behavior of Coal and Biomass: Synergistic Effect and Kinetic Analysis

Liu,

Huang,

Huang

et al. 2024

ACS Omega

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Co-pyrolysis of coal and biomass is an efficient way to utilize resources. This study investigates the co-pyrolysis behavior and kinetics of coal and biomass using thermogravimetric analysis (TGA) and TG-FTIR. Co-pyrolysis of coal and biomass exhibits a synergistic effect. When the biomass is 25%, the weight loss increases, showing a positive synergistic effect. When the biomass is 50%, it exhibits a negative synergistic effect. Increasing the heating rate can promote the generation of a synergistic effect. Co-pyrolysis involves two central pyrolysis stages: stage III (250− 380 °C) and stage IV (380−550 °C). Friedman, FWO, KAS, and STA methods are used to calculate the activation energy for stages III and IV. The activation energy (E α ) for co-pyrolysis is higher than that for coal or biomass pyrolysis alone. A positive synergistic effect is observed in stage III, while a negative synergistic effect is noted in stage IV. The master curve method determines an accurate reaction order (n) and pre-exponential factor (A) value of Coal75-Bio25. In stage III, E α = 238.81 kJ/mol, n = 2.4, A = 1.30 × 10 21 s −1 . In stage IV, E α = 37 8.01 kJ/mol, n = 4.0, A = 1.10 × 10 27 s −1 . The kinetic parameters in stage IV are significantly higher than those in stage III. TG-FTIR is used to analyze the synergistic effect of co-pyrolysis. Compared with coal and biomass pyrolysis separately, the Coal75-Bio25 pyrolysis process releases less CO 2 and more CH 4 . These findings support the synergistic effect of coal and biomass during co-pyrolysis.

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Study of co-pyrolysis kinetics, synergetic effects, and thermodynamics of coal and biomass blends

Cited by 4 publications

References 52 publications

The Combustion of Forest Humus Blended with Low-Rank Coal: Effects of Oxygen Ratio and Blending Ratio

The Combustion of Forest Humus Blended with Low-Rank Coal: Effects of Oxygen Ratio and Blending Ratio

Application of Ni/MgO catalysts in the pyrolysis of bituminous coal

Co-pyrolysis Behavior of Coal and Biomass: Synergistic Effect and Kinetic Analysis

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