Kinetics of coal char gasification in a carbon dioxide medium

Коротких, А. Г.; Slyusarskiy, Konstantin V.; Ditts, A. A.

doi:10.1134/s1990793116040059

Cited by 10 publications

(6 citation statements)

References 19 publications

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“…Diffusion regimes of conversion under thermal analysis conditions were reproduced with detailed thermohydrodynamic models [46,47]. In Reference [48], a two-dimensional model of heat and mass transfer in a porous carbon sample during gasification under conditions of rapid heating and subsequent maintaining of the constant reaction temperature is proposed. In the present study, the case of a constant heating rate during the whole experiment will be considered.…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric Study of the Kinetics of the Reaction C + CO2 under Pore-Diffusion Control

Donskoy¹,

Козлов²

2021

Energies

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This study presents experimental studies of charcoal gasification with CO2 at different heating rates (1, 5, 10, 20, and 50 K min−1). The kinetics of the reaction C + CO2 under pore-diffusion control is studied. We propose a new method for the proper determination of activation energy during the processing of thermogravimetric curves of porous carbon gasification under conditions of pore-diffusion resistance. The results of the inverse kinetic problem solution are compared with different hypotheses about the regime of the investigated heterogeneous reaction process (kinetic, diffusion, pore-diffusion). The change of reaction regimes from kinetic to diffusion is detected during charcoal gasification at different heating rates. At heating rates of 5–20 K min−1, the values of activation energy of carbon gasification reaction in the carbon dioxide atmosphere, obtained by the proposed method, closely match the data found in the previous studies. The use of diffusion models in the processing of thermogravimetric curves determines the conditions under which conventional kinetic models fail to provide adequate information about the temperature dependence of the heterogeneous reaction rate.

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Section: Introductionmentioning

confidence: 99%

Thermogravimetric Study of the Kinetics of the Reaction C + CO2 under Pore-Diffusion Control

Donskoy¹,

Козлов²

2021

Energies

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“…Thermochemical process of solid fuel gasification is carried out to obtain combustible gases (H 2 , CO, C n H m ) and realized during interaction of fixed carbon with different oxidizers. The air, oxygen, steam, carbon dioxide or their mixtures are used as oxidizing medium [3]. Depending on feed content, process temperature, fuel residence time and other factors the different syngas with needed characteristics could be obtained.…”

Section: Introductionmentioning

confidence: 99%

Coal char oxidation kinetics in air medium

2016

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Study of oxidation kinetics for three types of coal char with different carbon content in air is presented. The coal char powders of anthracite, bituminous T-grade coal and 2B-grade lignite with particle size less than 80 μm were tested. The coal char oxidation was researched by isothermal method via simultaneous TG-DSC analyzer Netzsch STA 449 Jupiter F3 in the temperature range of 1000-1200 °C. Measurements were carried out at ambient pressure. Volumetric flow rate of oxidizing medium into analyser chamber was 250 ml/min. Flow consisted of air and argon with volumetric ratio 24/1. Carbon average rate of oxidation reaction at each temperature were defined based on experimental results. Kinetic constants (the frequency factor and activation energy) were defined for Arrhenius equation modified with three submodels: volumetric model, shrinking core model and random pore model. The activation energy values for anthracite are 1,6-1,7 times higher than for chars of bituminous coal and lignite.

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“…Results presented in Table 1. Kinetic characteristics of heterogeneous carbon oxidation reactions for T-grade mark coal were taken from literature data [5]. The frequency factor and activation energy values for reactions of carbon interreacting with oxygen and carbon dioxide as the most intense reactions are given in table 2.…”

Section: Materials Characterizationmentioning

confidence: 99%

Physical-Mathematical Model for Fixed-Bed Solid Fuel Gasification Process Simulation

2016

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Abstract. Phycial-mathmatical model for fixed-bed coal gasification process simulation is proposed. The heterogeneous carbon oxidation chemical reactions were simulated via Arrhenius equation while homogeneous reactions in gas phase were calculated using Gibbs free energy minimization procedure. The syngas component concentration field and fuel conversion distribution as well as syngas final temperature and composition were defined for fixed bed gasification of T-grade coal of Kuznetskiy deposit. The optimal fuel residence time and gasifyer specific productivity were defined. The prevail reactions in oxidizing and reduction zones together with its height were defined.

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Kinetics of coal char gasification in a carbon dioxide medium

Cited by 10 publications

References 19 publications

Thermogravimetric Study of the Kinetics of the Reaction C + CO2 under Pore-Diffusion Control

Thermogravimetric Study of the Kinetics of the Reaction C + CO2 under Pore-Diffusion Control

Coal char oxidation kinetics in air medium

Physical-Mathematical Model for Fixed-Bed Solid Fuel Gasification Process Simulation

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