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Gasification of Coal by CO 2 : The Impact of the Heat Transfer Limitation on the Progress, Reaction Rate and Kinetics of the Process

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  • Krzysztof M. Czajka

    (Department of Energy Conversion Engineering, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland)

Abstract

This paper presents the impact of thermal lag on the progress of different coal types’ gasification by CO 2 . The analysis was performed using thermogravimetry and numerical modeling. Experiments were carried out at a heating rate of 1–50 Kmin −1 and a temperature ranging from 383 to 1173 K. The developed numerical model enabled the determination of a true sample temperature considering the gasification process to consist of two single-step consecutive reactions. Analysis revealed that the average thermal lag in CO 2 is about 11% greater than that in N 2 , which is related to the properties of CO 2 itself and the occurrence of the char–CO 2 reaction. The onset temperature of the reverse Boudouard reaction depends on the type of fuel; however, no simple relationship with the coal rank was found. Thermal lag has an impact on the kinetic parameter A α0.5 describing devolatilization, up to 19.8%, while in the case of the char–CO 2 reaction, this influence is expected to be even greater. The performed analysis proved that disregarding thermal lag may significantly hinder the interpretation of the analyzed processes; thus, TG experiments should be carried out with a low heating rate, or at the post-processing stage, a thermal lag model needs to be employed.

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  • Krzysztof M. Czajka, 2021. "Gasification of Coal by CO 2 : The Impact of the Heat Transfer Limitation on the Progress, Reaction Rate and Kinetics of the Process," Energies, MDPI, vol. 14(17), pages 1-22, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5569-:d:629884
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