Effect of Partial Rapid Pyrolysis on Bituminous Properties: From Structure to Reactivity

He, Qing; Huang, Yongmin; Ding, Lu; Guo, Qinghua; Gong, Yan; Yu, Guangsuo

doi:10.1021/acs.energyfuels.9b04439

Cited by 24 publications

(24 citation statements)

References 52 publications

(113 reference statements)

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“… 27 On the other hand, isothermal gasification in the TGA required the time to replace N 2 with CO 2 , which may result in lower reaction rates at the initial stage. 25 , 28 Overall, the reaction rate decreased with the increase of conversion. This was significantly different from catalytic gasification using a potassium-based or sodium-based catalyst, which usually had R max at the late stage of gasification.…”

Section: Resultsmentioning

confidence: 93%

“…The carbon conversion was calculated based on the TG curve 25 where w 0 , w t , and w f were the initial, instantaneous, and final masses during gasification. To compare the gasification reactivity of different coal chars, the reactivity index K was calculated based on eq 2 24 where Δ t is the time interval of conversion from 0.2 to 0.8.…”

Section: Methodsmentioning

confidence: 99%

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Analysis of Coal Gasification Reactivity, Kinetics, and Mechanism with Iron-Based Catalyst from Coal Liquefaction

Guo

Huang

et al. 2021

ACS Omega

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In this work, the effect of an iron-based catalyst from coal liquefaction on coal gasification was studied. Two catalyst loading methods and three catalyst loading contents were taken into consideration. Besides, the carbon structure, surface morphology, and element distribution of coal char and gasified semi-char were investigated, and the interactions between the catalyst and internal minerals of coal were studied. The results showed that the coal char prepared by wet impregnation had higher reactivity than that prepared by a dry mixing method. From the perspective of improving the coal reactivity, the optimal addition method should be wet impregnation with a 2% catalyst. The model-free and model-fitting methods were applied to study the catalytic gasification kinetics. The iron-based catalyst would be broken during wet impregnation, and the catalyst fragments could stick to the surface of coal char, resulting in higher reactivity. The graphitization of char increased with the addition of the iron-based catalyst. This can imply that the carbon structure cannot effectively represent the gasification reactivity in the presence of the iron-based catalyst. The Iron-based catalyst can accelerate the gasification rate alone and can also provide higher catalytic activity with the internal minerals of coal.

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Section: Resultsmentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Analysis of Coal Gasification Reactivity, Kinetics, and Mechanism with Iron-Based Catalyst from Coal Liquefaction

Guo

Huang

et al. 2021

ACS Omega

Self Cite

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“…The active sites and reactivity of coal particles have been widely studied. [14][15][16][17][18] The pyrolysis of oxygencontaining functional groups in coal-generated active sites. [19][20][21][22] In addition, the generation of active sites during isothermal pyrolysis follows an exponential compound function with pyrolysis time.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation analysis of the induced thrust on a char particle in reaction process

et al. 2022

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The force exerted on particles is of great significance to the flow and reaction characteristics of particles in gasifier. In this study, the unbalanced thrust, especially its magnitude, of a single char particle induced by chemical reactions during combustion process is investigated numerically, based on the random distribution of active sites.It is revealed that the nonuniform distribution of active sites directly leads to the nonuniform absorption of reactants and release of products, which accounts for the net induced thrust on particles. The effects of active site ratio, ambient gas temperature and particle diameter on the induced thrust of reacting particles were investigated. The results show that the induced thrust on particles could be equal to the magnitude of particle gravity. The induced thrust is determined by the nonuniformity of carbon distribution on char surface. The net thrust is enhanced with the increase of specific carbon consumption rate.

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“…However, they did not investigate the effect of pyrolysis time on the pore structure or chemical structure of coal char to explain the change in coal char reactivity. He et al 21 investigated the influence of partial rapid pyrolysis on the properties of Chinese bituminous coal. They stated that the pretreatment of rapid pyrolysis had a fundamental effect on the coal char structure and reactivity.…”

Section: Introductionmentioning

confidence: 99%

Pore Structure and Fractal Characteristic Analysis of Gasification-Coke Prepared at Different High-Temperature Residence Times

et al. 2020

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An accurate and quantitative description of the pore structure of gasification-coke using fractal geometry could be of great significance to its industrial utilization. In this study, gasification-coke was prepared with low-quality coal blending at different high-temperature residence times to investigate the variation in the pore structure, fractal dimensions, reactivities, and their relationship. The pore structure parameters (e.g., specific surface area, pore volume, and average pore diameter) of gasification-coke were investigated by low-temperature N 2 adsorption/desorption and mercury intrusion porosimetry. Fractal dimensions D 1 and D 2 (at relative pressures of 0–0.5 and 0.5–1, respectively) were calculated using the fractal Frenkel–Halsey–Hill model, and the fractal dimension D 3 was obtained using the Menger sponge model. The results show that the pore structure systems of gasification-coke prepared at different high-temperature residence times are continuous and complete, which contributes to the gasification reaction. The variation trend of the macropore structure parameters is more complex than that of micropore and mesopore with the extension of the high-temperature residence time. It is found that D 1 is linearly correlated with the micropore specific surface area, indicating that D 1 is more suitable for reflecting the roughness of the micropore surface; D 2 is linearly correlated with the mesopore volume and can describe the volumetric roughness of the mesopore; and D 3 reflects the irregularities and surface roughness of the macropores. Gasification reactivity is closely related to the D 2 value, and the reactivity of the gasification-coke may be improved if the number of mesopores is increased by controlling the high-temperature residence time or other pyrolysis conditions. The research results will provide theoretical reference for controlling the gasification reaction of gasification-coke and gasifier design.

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Effect of Partial Rapid Pyrolysis on Bituminous Properties: From Structure to Reactivity

Cited by 24 publications

References 52 publications

Analysis of Coal Gasification Reactivity, Kinetics, and Mechanism with Iron-Based Catalyst from Coal Liquefaction

Analysis of Coal Gasification Reactivity, Kinetics, and Mechanism with Iron-Based Catalyst from Coal Liquefaction

Numerical simulation analysis of the induced thrust on a char particle in reaction process

Pore Structure and Fractal Characteristic Analysis of Gasification-Coke Prepared at Different High-Temperature Residence Times

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