Experimental and kinetic studies of coal–CO<sub>2</sub> gasification in isothermal and pressurized conditions

Cao, Yan; Liu, Qingcai; Yang, Jinlong

doi:10.1039/c6ra25994d

Cited by 22 publications

(17 citation statements)

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“…23,33 It was because the ash content of the selected coal was as high as above 20%, which had a great influence on the char preparation process and gasification process, and led to the variations of char structures, failing to follow the RPM during the char gasification process, especially, in the postreaction stage. 27,28…”

Section: Resultsmentioning

confidence: 99%

“…However, because of the effect of the inherent ash in coals on the reactions occurring during CO 2 gasification, such as the formation of volatiles and tars and their subsequent pyrolysis reactions, 21 and the variations of char porous structures and graph crystallites during the char gasification, it is difficult to explain the gasification reaction rate throughout the char gasification by the classical RPM. 27,28…”

Section: Introductionmentioning

confidence: 99%

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Structure Characterization and CO₂ Gasification Kinetics of Tri-High Coal-Chars Derived from High-Temperature Pyrolysis

et al. 2019

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The pore structures and chemical composition features of two kinds of tri-high coal and their char samples prepared at a 750 °C temperature were analyzed. The results showed that the pyrolysis process has a great influence on the pore structure and the chemical composition of the char, and the influence is highly related to the coal ranks. The gasification kinetics of the two chars in pure CO2 atmosphere was also studied. The results indicated that the classical random pore model (RPM) cannot be used to explain the gasification kinetics throughout the char gasification. A modified RPM, considering the inhibitory effect of ash on the gasification kinetics, was adopted to estimate the kinetics, and the kinetic constants and the corresponding activation energies were calculated. It was observed that it was necessary to include the effect of ash on the variations of char structures during the char gasification to get an accurate description of reaction rate versus carbon conversion throughout the gasification of the tri-high coal chars.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure Characterization and CO₂ Gasification Kinetics of Tri-High Coal-Chars Derived from High-Temperature Pyrolysis

et al. 2019

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“…The TGA-HP150S model is specially congured for gasication and related studies. 23,24 It includes an integrated steam generator and a double-walled reaction chamber that allows for higher temperatures. The maximum weight capacity is 25 g. The weighing accuracy is AE0.0002%.…”

Section: Operating Conditionsmentioning

confidence: 99%

Process simulation of coal-direct chemical looping gasification for syngas production

Cao

Liu

et al. 2017

RSC Adv.

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The coal gasification process is used in the commercial production of syngas as a means toward the clean use of coal. In this paper, the process of syngas production via the coal-direct chemical looping gasification process (CDCLG) is modeled under thermochemical equilibrium with the Gibbs free energy approach, and the model is developed using a complete and comprehensive simulation model.Due to the kinetic limits of char gasification, the carbon conversion efficiency is not suggested to be larger than 0.9 in the fuel reactor during the CDCLG process. Besides, the simulation results suggest the residual carbon should be burnt in the air reactor. Moreover, the effects of various conditions, which include carbon conversion, temperature, pressure and the steam feed ratio, on the input and energy output parameters, including the air feed ratio, efficiency of electricity and syngas quality, are studied and revealed in this paper.

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“…Unlike CO 2 , water is resource-limited and energy-intensive. Although CO 2 is less reactive than steam, it is still widely used in the coal gasification process because it can reduce the dependence on water resources [5].…”

Section: Introductionmentioning

confidence: 99%

“…Many factors have been proven to affect coal gasification rates, including temperatures [5,6], partial pressure of the gasification agent [5,7], coal rank [8,9], as well as particle size [10,11]. Coal is Energies 2020, 13, 3313 2 of 10 a heterogeneous material containing large amounts of impurities, like mineral mater.…”

Section: Introductionmentioning

confidence: 99%

Gasification of Shenhua Bituminous Coal with CO2: Effect of Coal Particle Size on Kinetic Behavior and Ash Fusibility

Zhang¹,

Wang²,

Zhao³

et al. 2020

Energies

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Coal gasification is the process that produces valuable gaseous mixtures consisting primarily of H2 and CO, which can be used to produce liquid fuel and various kinds of chemicals. The literature shows that the effect of particle size on coal gasification and fusibility of coal ash is not clear. In this study, the gasification kinetics and ash fusibility of three coal samples with different particle size ranges were investigated. Thermogravimetric results of coal under a CO2 atmosphere showed that the whole weight loss process consisted of three stages: the loss of moisture, the release of volatile matter, and char gasification with CO2. Coal is a heterogeneous material containing impurities. Different grinding fineness leads to different liberation degrees for impurities. As for the effect of particle size on TG (thermogravimetry) curves, we found that the final solid residue amount was the largest for the coal sample with the smallest particle size. The Miura-Maki isoconversional model was proved to be appropriate to estimate the activation energy and its value experienced a slow increase when the particle size of raw coal increased. Further, we found that particle size had an important impact on ash fusion temperatures and small particle size resulted in higher ash fusion temperatures.

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Experimental and kinetic studies of coal–CO₂ gasification in isothermal and pressurized conditions

Abstract: This study is to explicate the reaction mechanisms and kinetics of high-pressure char CO2 gasification via a joint experimental and model simulation approach.

Cited by 22 publications

References 40 publications

Structure Characterization and CO₂ Gasification Kinetics of Tri-High Coal-Chars Derived from High-Temperature Pyrolysis

Structure Characterization and CO₂ Gasification Kinetics of Tri-High Coal-Chars Derived from High-Temperature Pyrolysis

Process simulation of coal-direct chemical looping gasification for syngas production

Gasification of Shenhua Bituminous Coal with CO2: Effect of Coal Particle Size on Kinetic Behavior and Ash Fusibility

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Experimental and kinetic studies of coal–CO2 gasification in isothermal and pressurized conditions

Abstract: This study is to explicate the reaction mechanisms and kinetics of high-pressure char CO2 gasification via a joint experimental and model simulation approach.

Cited by 22 publications

References 40 publications

Structure Characterization and CO2 Gasification Kinetics of Tri-High Coal-Chars Derived from High-Temperature Pyrolysis

Structure Characterization and CO2 Gasification Kinetics of Tri-High Coal-Chars Derived from High-Temperature Pyrolysis

Process simulation of coal-direct chemical looping gasification for syngas production

Gasification of Shenhua Bituminous Coal with CO2: Effect of Coal Particle Size on Kinetic Behavior and Ash Fusibility

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Experimental and kinetic studies of coal–CO₂ gasification in isothermal and pressurized conditions

Structure Characterization and CO₂ Gasification Kinetics of Tri-High Coal-Chars Derived from High-Temperature Pyrolysis

Structure Characterization and CO₂ Gasification Kinetics of Tri-High Coal-Chars Derived from High-Temperature Pyrolysis