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The kinetics of CO2 gasification of coal chars

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Abstract

The gasification reactivities of three char samples derived from coals of varying ranks (“Turów” lignite, “Piast”, and “Wieczorek” sub-bituminous coals) toward CO2 were investigated isothermally using thermogravimetric analysis. Kinetic behavior was studied at temperatures of 900, 950, and 1,000 °C under atmospheric pressure. Conditions for the chemical-controlled regime were established at these temperatures and pressure. In this paper, four kinetic models were applied to describe the varying conversion rate: volumetric model, grain model, modified volumetric model, and random pore model. From these models, only the random pore and the volumetric models positively corresponded to nearly the entire range of experimental results. Calculated values of activation energy for study samples were in the range of 180–250 kJ mol−1, which is in accordance with other reported data. Moreover, the obtained results confirmed the significant impact of parent coal rank on its char reactivity, offering possibilities in the approximation of coal char kinetic behavior after further more detailed studies with a larger number of samples.

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Abbreviations

a :

Empirical constant in modified volumetric model (–)

A :

Pre-exponential factor (min−1)

A :

Ash content (wt %)

b :

Empirical constant in modified volumetric model (–)

C :

Carbon content (wt %)

E :

Activation energy (kJ mol−1)

ε :

Porosity per unit volume of sample (cm3 cm−3)

H :

Enthalpy (kJ mol−1)

k :

Kinetic constant (min−1)

\( \bar{k}_{\text MVM} \) :

Mean value of kinetic constant of modified volumetric model (min−1)

L :

Pore length per unit volume of sample (cm cm−3)

m :

Mass (mg)

M :

Moisture content (wt %)

R :

Universal gas constant (kJ mol−1 K−1)

R 2 :

Determination coefficient (–)

R 0 :

Mean random reflectance of vitrinite (%)

S :

Surface area per unit volume of sample (cm2 cm−3)

T :

Absolute temperature (K)

t :

Time (min)

Ψ :

Structural parameter in random pore model (–)

V :

Volatile matter content (wt %)

X :

Fractional conversion degree of solid (–)

T :

Total

A :

Relates to mineral matter

C :

Relates to combustible matter

d :

Calculated by difference

max :

Maximal

0 :

Refers to initial state

ar :

As-received basis

ad :

Air-dried basis

d :

Dry basis

daf :

Dry and ash-free basis

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Acknowledgements

The research results presented herein were obtained during the course of the project “Development of coal gasification technology for high-efficiency production of fuels and energy,” Task No. 3 of the Strategic Program for Research and Development: “Advanced energy generation technologies” funded by the Polish National Centre for Research and Development. M. Tomaszewicz has received a scholarship under the project “Doktoris—Scholarship Programme for the Innovative Silesia,” co-financed by the European Union in the frame of the European Social Fund.

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Authors and Affiliations

  1. Institute for Chemical Processing of Coal, Zamkowa 1, 41-803, Zabrze, Poland

    Martyna Tomaszewicz, Grzegorz Łabojko, Grzegorz Tomaszewicz & Michalina Kotyczka-Morańska

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  1. Martyna Tomaszewicz
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  2. Grzegorz Łabojko
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  3. Grzegorz Tomaszewicz
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  4. Michalina Kotyczka-Morańska
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Correspondence to Martyna Tomaszewicz.

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Tomaszewicz, M., Łabojko, G., Tomaszewicz, G. et al. The kinetics of CO2 gasification of coal chars. J Therm Anal Calorim 113, 1327–1335 (2013). https://doi.org/10.1007/s10973-013-2961-2

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  • DOI: https://doi.org/10.1007/s10973-013-2961-2

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