New approach to a problem of heat transfer with chemical reaction in a cylinder of finite dimensions

Piddubniak, Оlexa; Ledakowicz, S.; Nowicki, Ł.

doi:10.1016/j.ijheatmasstransfer.2010.09.038

Cited by 4 publications

(2 citation statements)

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“…In Reference [45], it is shown that depending on the size of the particles, there are regimes of gasification with different degrees of utilization of the inner surface. 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.…”

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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“…In this approach a sample was usually assumed as an infinitely long cylinder, allowing the problem to be described by a two-dimension model.. Despite this simplification the solution of the balance equations is complicated and time-consuming regardless of whether a numerical method or simplified analytical solution was used (Piddubniak, 2011). In this study a simple approach is proposed which helps to eliminate the heat transfer effects and to obtain the correct kinetic parameters from thermogravimetric data collected from bigger samples.…”

Section: Introductionmentioning

confidence: 99%

Kinetic analysis of thermogravimetric data collected from bigger samples

Nowicki¹,

Markowski²

2012

Chemical and Process Engineering

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Results for microcrystalline cellulose pyrolysis are presented, which includes thermogravimetric measurements and kinetic analysis of experimental data. The effect of sample mass size and heating rate on estimated values of activation energy and pre-exponential factor is demonstrated and a simple modification of procedure is proposed that allows for the correct values of kinetic parameters regardless of the experimental conditions. The efficiency of the proposed method is confirmed for two endothermic chemical reactions. A method of nonlinear regression is used for calculation of kinetic parameters for a single or TG curve or several curves simultaneously.

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