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. 2021 Dec 10;6(50):34615-34623.
doi: 10.1021/acsomega.1c05007. eCollection 2021 Dec 21.

Influence of the Heating Rate on the Quality of Metallurgical Coke

María F Vega  1 , Elvira Díaz-Faes  1 , Carmen Barriocanal  1
Affiliations

Influence of the Heating Rate on the Quality of Metallurgical Coke

María F Vega et al. ACS Omega. .

Abstract

Four bituminous coals of different origins and ranks and one industrial coal blend were carbonized at a semi-pilot scale at various temperatures to study the effect of heat treatment (i.e., different heating rates) on the structural evolution and hence the subsequent reactivity of the resulting cokes and their mechanical strength. The development of the coke microstructural order under different thermal treatments during carbonization was assessed by means of Raman spectroscopy. The results indicated an improvement in the structural order with increased operating temperatures and hence increased heating rates and a decrease in the active sites. The quality of the cokes was determined by means of the Japanese Industrial Standard (JIS) and the Nippon Steel Corporation (NSC) tests. In addition, the apparent reaction rate of cokes was measured using a fixed bed reactor. The increase in the heating rate during carbonization led to cokes with a lower mechanical strength and apparent reaction rate. Good correlation was found between the apparent reactivity of cokes and the coke strength after reaction.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Evolution of the charge center temperature with the coking time for cokes obtained at different heating rate.
Figure 2
Figure 2
Curve fit Raman spectra of cokes obtained from HV1 coal at different temperature 1020 (a), 1200 °C (b).
Figure 3
Figure 3
Relationship between the AD1/AG index and the heating rate in 400–500 °C (a) and the AD3+4/AG index and the heating rate in 500–750 °C (b).
Figure 4
Figure 4
Effect of heating rate on the variation of the apparent reaction rate as a function of conversion at 900 °C of cokes produced from LV (a), MV (b), HV1 (c), HV2 (d) and B (e) coals.
Figure 5
Figure 5
Relationship between the apparent rate of cokes produced at different heating rate in the range between 400 and 500 °C.
Figure 6
Figure 6
Relationship between CSR index and apparent rate of cokes produced at different heating rate.
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