Variability in Metallurgical Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR): An Experimental Study

Kumar, Deepak; Saxena, V. K.; Tiwari, H. P.; Nandi, Barun Kumar; Verma, A. K.; Tiwary, Vijay Kumar

doi:10.1021/acsomega.1c04270

Cited by 13 publications

(5 citation statements)

References 24 publications

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“…Resistivity and reactivity are different in nature. For example, the analyses of many studies [17][18][19] show that the properties of the coal used (ash content, sulfur content, mineral composition, volatile yield, and petrographic composition), the technology of the batch preparation, the thermal regime of its coking, and the coking period affect the CRI. At the same time, both of these indicators change synchronously because they are influenced by some common factors, such as the temperature level and coke readiness, which indicates the orderliness of its structure.…”

Section: Discussionmentioning

confidence: 99%

Electrical Resistance as an Aggregate Characteristic of Coke Properties for Electrochemical and Coke Production

Miroshnichenko,

Shmeltser,

Kormer

et al. 2024

Electrochem

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The influence of the component composition of coal batches and the final temperature of the coking process on the resistivity of coke was studied. Taking into account that the resistivity and reactivity are influenced by some common factors, such as the temperature level and coke readiness, which indicates the orderliness of its structure, the relationship between these indicators was established. The electrical resistivity can be considered a cumulative characteristic of coke properties, as evidenced by the mathematical dependencies of the change electrical resistance on the ash content, sulfur content, volatile yield, and petrographic composition. Analysis of the dependencies and their statistical evaluation indicate that the studied relationships are characterized by high values of correlation (0.6–0.84). The proposed regression equations can be recommended for optimizing the component composition and quality of production batches, given their significant impact on the resistivity of coke. This is especially relevant when coke is used in electrothermal processes, since the productivity and the electrical and thermal efficiency of the furnace depends on the resistivity of the coke in electrochemical processes in which carbon materials are used as anodes and lining elements and in the production of capacitor technology. As the resistivity test requires much less time to perform than the reactivity test, it can be considered as an alternative approach to the reactivity testing currently performed for quality control purposes.

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Section: Discussionmentioning

confidence: 99%

Electrical Resistance as an Aggregate Characteristic of Coke Properties for Electrochemical and Coke Production

Miroshnichenko,

Shmeltser,

Kormer

et al. 2024

Electrochem

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“…The critical factor determining the normal operation of BF is ∆P/H. In order to quantify the permeability of the furnace charge, the permeability of burden was calculated by the Ergun equation [25], which is shown by Equation (7), where d p , u, ε, ρ, µ, φ were defined as particle diameter, gas velocity, void fraction, density, viscosity, and the shape factor, respectively. Furthermore, the coke average diameter was 10 mm, the void fraction was 0.418, and the shape factor was 0.785, as is shown in the research of Yamada [26].…”

Section: Mathematical Model Of Permeabilitymentioning

confidence: 99%

“…The dissected blast furnace [ 5 ] showed that the coke solution loss reaction influenced the gas permeability of the upper part of BF [ 6 , 7 , 8 ], and there are many references available in this field [ 9 , 10 ]. In addition, the thickness of the coke layer is also an important factor affecting the distribution of gas flow.…”

Section: Introductionmentioning

confidence: 99%

Study on the High-Temperature Interaction between Coke and Iron Ores with Different Layer Thicknesses

Wang,

Du,

Diao

et al. 2024

Materials

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Coke plays a key role as the skeleton of the charge column in BF. The gas path formed by the coke layer in the BF has a decisive influence on gas permeability. At high temperatures, the interface between coke and ore undergoes a melting reaction of coke and a reduction reaction of ore. The better the reducibility of the ore, the more conducive it is to the coupling reaction of ore and coke. The melting loss reaction of coke becomes more intense, and the corresponding strength of coke will decrease, which will affect the permeability of the blast furnace and is not conducive to the smooth operation of the blast furnace. Especially with a deterioration in iron ore quality, BF operation faces severe challenges, which makes it necessary to find an effective way to strengthen BF operation. In this study, a melting-dropping furnace was used to develop and clarify the high-temperature interaction between coke and iron ores with different layer thicknesses. The influencing factors were studied by establishing a gas permeability mathematical model and observing the metallographic microscope images of samples after the coke solution loss reaction. The relationships between coke layer thickness, distribution of gas flow, and pressure drop were obtained. The results showed that, under certain conditions, the gas permeability property of a furnace burden has been improved after the coke layer thickness increased. Upon observing the size of coke particles at the interface reaction site, the degree of melting loss reaction can be determined. A smaller particle size indicates more melting loss reaction. A dripping eigenvalue for molten metal was introduced to evaluate the dynamic changes in the comprehensive dripping properties of molten metal of furnace burden, which showed that the dripping eigenvalue for the molten metal could deteriorate because of the unruly thickness and the coke layer thickness should be limited through considering the operational indicators of the blast furnace.

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“…The CSR and CRI of the coke also fall, although fluidity marginally improves as a result of lowering the particle size of the biochar. A range of 2-4 mm was determined to be the ideal particle size for biochar [135].…”

Section: The Challenges and Future Prospects In The Application Of Li...mentioning

confidence: 99%

The Application of Lignocellulosic Biomass Waste in the Iron and Steel Industry in the Context of Challenges Related to the Energy Crisis

Biniek-Poskart,

Sajdak,

Skrzyniarz

et al. 2023

Energies

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This review presented a comprehensive analysis of recent developments in research regarding the use of lignocellulosic biomass products in the iron and steel industry. The role of lignocellulosic biomass used as a source of energy as well as reducing agents in iron and steel sector in the era of energy crisis served as the foundation for this review. Attention has been paid to different biomass characteristics as well as pretreatment methods and conversion products of biomass. The present review also included some issues of energy management system in the steel industry. Furthermore, the possibilities of replacing fossil energy carriers with lignocellulosic biomass in the steel and iron industry was reviewed focusing on advantages, challenges, and future prospects. The present process and product quality criteria, which biomass-derived fuels must also meet, was discussed. This paper compiled the most current developments in biomass metallurgical research to serve as a source for the theoretical foundation as well as for the development of practical applications. The novelty of this study lies in the comprehensive discussion of the lignocellulosic biomass application in the iron and steel industry that are so far unpublished.

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Variability in Metallurgical Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR): An Experimental Study

Cited by 13 publications

References 24 publications

Electrical Resistance as an Aggregate Characteristic of Coke Properties for Electrochemical and Coke Production

Electrical Resistance as an Aggregate Characteristic of Coke Properties for Electrochemical and Coke Production

Study on the High-Temperature Interaction between Coke and Iron Ores with Different Layer Thicknesses

The Application of Lignocellulosic Biomass Waste in the Iron and Steel Industry in the Context of Challenges Related to the Energy Crisis

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