Effect of coal grade and heating rate on the thermal degradation behavior, kinetics, and thermodynamics of pyrolysis of low-rank coal

Sabat, Gayatri; Gouda, Narayan; Panda, Achyut K.

doi:10.1080/19392699.2022.2096013

Cited by 4 publications

(2 citation statements)

References 31 publications

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“…The experimental results show that this method can obviously increase the tar yield, but this method has certain requirements for coal types [15]. In terms of catalysts, some scholars chose Co-ZSM molecular sieves to change the effect of catalysts on the pyrolysis process, and this experiment showed that Co catalysts can effectively activate hydrogen radicals and stabilize the macromolecular radicals to improve the tar quality and yield [16]. Other scholars promoted the pyrolysis process by introducing metal catalysts in the stretcher-loaded in situ, and the experimental results showed that this method could crack the macromolecular volatile fraction but could not effectively improve the tar yield [17].…”

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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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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“…For example, Zhang et al [30] studied the thermodynamic parameters of coal spontaneous combustion at different heating rates before and after the ignition temperature. Sabat et al [31] studied the thermal degradation characteristics, kinetics, and thermodynamics of different grades of low-rank coal at different heating rates through thermogravimetric analysis. Meanwhile, Wang et al [32] employed a thermogravimetric simulation test bench to study the pyrolysis characteristics and kinetics of bituminous coal at different heating rates.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of External Air Supply and Temperature Control on Coal Spontaneous Combustion Characteristics

et al. 2023

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Coal spontaneous combustion in underground mine goaf has a great impact on coal mining. The temperature-programmed experiment is a commonly used and effective method for studying the characteristics of coal spontaneous combustion. Aiming at the problem that the numerical simulation of coal spontaneous combustion characteristics under the condition of external air supply and temperature control in a temperature-programmed experiment is insufficient, a multi-physical field coupling numerical model of coal spontaneous combustion in the temperature-programmed experiment is established. The variation characteristics of coal temperature, oxygen, and oxidation products under external air supply and temperature control were studied. The results show that the numerical simulation results are consistent with the experimental results. With the increase in temperature, the volume fractions of oxygen and carbon dioxide decrease and increase, respectively. As the air supply volume increases, the oxygen volume fraction at the outlet increases, and the peak value of the oxygen volume fraction change rate exhibits a “hysteresis” feature, and the time corresponding to the peak value increases. Moreover, the temperature change rate increases. With the increase in the heating rate, the peak value of the oxygen volume fraction change rate increases and shows an “early appearance” characteristic, at the same time, the maximum coal temperature displays a linear increase trend.

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