Thermodynamic and kinetic behaviors of coal gasification

Lan, Chenchen; Lyu, Qing; Qie, Yana; Jiang, Maofa; Liu, Xiaojie; Zhang, Shuhui

doi:10.1016/j.tca.2018.06.019

Cited by 21 publications

(10 citation statements)

References 13 publications

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“…Smith and Missen [41] shown that these approaches are essentially equivalent, and that is corroborated by others authors that considered both approaches conceptually similar [42,43]. The stoichiometric approach might also employ free energy data to determine the equilibrium constants of a predefined set of reactions [12,44].…”

Section: Gasification Equilibrium Modelsmentioning

confidence: 71%

“…A j is defined as the total number of atoms of the jth element reaction mixture, a i,j is the number of atoms of the j t,h element in a mole of the i t,h species. Notwithstanding existing several possibilities to minimize the Gibbs free energy, the Lagrange multipliers yield satisfactory results [44,48], hence consider here. Other alternatives will be discussed in the next section.…”

Section: Non-stoichiometric Modelingmentioning

confidence: 99%

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A Holistic Review on Biomass Gasification Modified Equilibrium Models

et al. 2019

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Biomass gasification is realized as a settled process to produce energy in a sustainable form, between all the biomass-based energy generation routes. Consequently, there are a renewed interest in biomass gasification promoting the research of different mathematical models to enlighten and comprehend gasification process complexities. This review is focused on the thermodynamic equilibrium models, which is the class of models that seems to be more developed. It is verified that the review articles available in the literature do not address non-stoichiometric methods, as well as an ambiguous categorization of stoichiometric and non-stoichiometric methods. Therefore, the main purpose of this article is to review the non-stoichiometric equilibrium models and categorize them, and review the different stoichiometric equilibrium model’s categorization available in the literature. The modeling procedures adopted for the different modeling categories are compared. Conclusion can be drawn that almost all equilibrium models are modified by the inclusion of empirical correction factors that improves the model prediction capabilities but with loss of generality.

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Section: Gasification Equilibrium Modelsmentioning

confidence: 71%

Section: Non-stoichiometric Modelingmentioning

confidence: 99%

A Holistic Review on Biomass Gasification Modified Equilibrium Models

et al. 2019

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“…Thermogravimetric analysis (TGA) helps in estimating the gasification reactivity and evaluating if the reactants are suitable for gasification technology 9,10 . Some studies on DCLR gasification reactivity have been published.…”

Section: Introductionmentioning

confidence: 99%

“…8 Thermogravimetric analysis (TGA) helps in estimating the gasification reactivity and evaluating if the reactants are suitable for gasification technology. 9,10 Some studies on DCLR gasification reactivity have been published. Liu et al 11 conducted co-gasification of DCLR and petroleum coke in carbon dioxide by thermogravimetric analysis.…”

mentioning

confidence: 99%

Kinetic study of CO ₂ gasification on coal char and extraction residue char from direct coal liquefaction

Liu

Fang

et al. 2020

Int J Energy Res

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Summary Extraction residue (ER) is, in this study, considered as an insoluble portion derived from a novel extraction process with direct coal liquefaction residue, which is the byproduct from 1000 kton/y direct coal liquefaction and oil production process in Ordos, China. ER mostly consists of unreacted coal and minerals, spent catalyst, and solvent. It is considered as a hazardous waste in China. Gasification is a promising way to employ ER, as the carbon resource contained in it could be adequately utilized, so strongly reducing the environmental impact of this material. In this paper, a kinetic study is carried out concerning CO2 gasification (in thermobalance) of ER char, coal char, and their blends. The results show that, at temperatures ranging from 1123 to 1323 K, the reactivity of ER char is much larger than that of coal char, and the reactivity of ER/coal char blends increases when the ER fraction increases, consistently resulting in between the reactivities shown by ER char and coal char alone. The partial pressure of CO2 promotes the reactivity of all samples. BET surface area resulted three times larger for ER char vs coal char, while pore surface area and pore volume were four times larger. Moreover, the relevant parameters of the random pore model for CO2 gasification of ER char, coal char, and their blend #2 (with 20% ER) were obtained; the activation energy resulted 210.6, 240.5, and 232.8 kJ/mol, and the reaction order 0.30, 0.45, and 0.40, respectively.

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“…Coal is a particularly important energy resource and is currently responsible for approximately 70% of total energy consumption in China (Lan et al 2018;Zhu et al 2020). Urgent development of clean coal utilization technology is required because of increasing environmental pollution from coal-fired power plants.…”

Section: Introductionmentioning

confidence: 99%

Kinetic and thermodynamic investigations of CO2 gasification of coal chars prepared via conventional and microwave pyrolysis

Jiang

Meng

et al. 2020

Int J Coal Sci Technol

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This study examined an isothermal CO2 gasification of four chars prepared via two different methods, i.e., conventional and microwave-assisted pyrolysis, by the approach of thermogravimetric analysis. Physical, chemical, and structural behaviours of chars were examined using ultimate analysis, X-ray diffraction, and scanning electronic microscopy. Kinetic parameters were calculated by applying the shrinking unreacted core (SCM) and random pore (RPM) models. Moreover, char-CO2 gasification was further simulated by using Aspen Plus to investigate thermodynamic performances in terms of syngas composition and cold gas efficiency (CGE). The microwave-induced char has the largest C/H mass ratio and most ordered carbon structure, but the smallest gasification reactivity. Kinetic analysis indicates that the RPM is better for describing both gasification conversion and reaction rates of the studied chars, and the activation energies and pre-exponential factors varied in the range of 78.45–194.72 kJ/mol and 3.15–102,231.99 s−1, respectively. In addition, a compensation effect was noted during gasification. Finally, the microwave-derived char exhibits better thermodynamic performances than the conventional chars, with the highest CGE and CO molar concentration of 1.30% and 86.18%, respectively. Increasing the pyrolysis temperature, gasification temperature, and CO2-to-carbon molar ratio improved the CGE.

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Thermodynamic and kinetic behaviors of coal gasification

Cited by 21 publications

References 13 publications

A Holistic Review on Biomass Gasification Modified Equilibrium Models

A Holistic Review on Biomass Gasification Modified Equilibrium Models

Kinetic study of CO ₂ gasification on coal char and extraction residue char from direct coal liquefaction

Kinetic and thermodynamic investigations of CO2 gasification of coal chars prepared via conventional and microwave pyrolysis

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Thermodynamic and kinetic behaviors of coal gasification

Cited by 21 publications

References 13 publications

A Holistic Review on Biomass Gasification Modified Equilibrium Models

A Holistic Review on Biomass Gasification Modified Equilibrium Models

Kinetic study of CO 2 gasification on coal char and extraction residue char from direct coal liquefaction

Kinetic and thermodynamic investigations of CO2 gasification of coal chars prepared via conventional and microwave pyrolysis

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Product

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Kinetic study of CO ₂ gasification on coal char and extraction residue char from direct coal liquefaction