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Dimensional Changes of Molecularly Oriented Domains in Coke

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Abstract

The following characteristics of molecularly oriented coke domains are investigated as a function of their position within the coke and the distance from the coke oven’s heating wall: their height Lc and width La, the interplane distance d002, the domain density ρ, and the number of layers N within the domain. It is found that Lc and La decrease nonlinearly with increase in the distance from the coke oven’s heating wall. The coke’s structural strength Πc (State Standard GOST 9521–2017) is greater for positions near the wall than for the central region of the coke. The ash content and chemical composition of coke samples in the >0.1 mm and <0.1 mm size classes are determined after crushing in a mill. On the basis of the results of this research and literature analysis, it is established that there is no reliable mathematical model relating the high-temperature characteristics CRI and CSR with the cold mechanical strength M10 and M25. Hence, in broad coke ovens, with constant batch composition, the coke produced may be regarded as of high quality in terms of M10 and M25 but of low quality in terms of CRI and CSR. If the variation in the characteristics of the molecularly oriented domains and the strength of the coke after reaction with CO2 (CSR) are compared as a function of the distance from the coke oven’s heating wall, it is clear that the parameters Lc, La, and d002 may be used to create a model capable of predicting CSR.

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Funding

Financial support for this research was provided by the Russian Science Foundation (grant 22-79-00073, https://rscf.ru/project/22-79-00073/).

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Authors and Affiliations

  1. Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia

    D. I. Alekseev, S. A. Krylova, D. A. Gorlenko, M. Yu. Zhidkov, A. M. Gelivanov, R. I. Islamgulov & T. A. Shaykhislamova

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  1. D. I. Alekseev
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  2. S. A. Krylova
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  3. D. A. Gorlenko
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  4. M. Yu. Zhidkov
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  5. A. M. Gelivanov
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  6. R. I. Islamgulov
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  7. T. A. Shaykhislamova
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Corresponding authors

Correspondence to D. I. Alekseev, S. A. Krylova, D. A. Gorlenko, M. Yu. Zhidkov, A. M. Gelivanov, R. I. Islamgulov or T. A. Shaykhislamova.

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Translated by B. Gilbert

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Alekseev, D.I., Krylova, S.A., Gorlenko, D.A. et al. Dimensional Changes of Molecularly Oriented Domains in Coke. Coke Chem. 66, 555–563 (2023). https://doi.org/10.3103/S1068364X23600148

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