Factors that influence CSR and CRI

Stepanov, E. N.; Mezin, D. A.; Shashkov, O. A.; Mel’nikov, I. I.; Roslyi, A. Yu.; Chuikina, O. V.

doi:10.3103/s096709120910009x

Cited by 6 publications

(1 citation statement)

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“…At 1100 °C, the solution loss region was the largest and increased in local porosity, which was relatively homogeneous, whereas in the coke outer-surface region, the solution loss region and degradation region occurred at 1300 °C. Still, variability at 1150 °C for CO 2 concentration and local porosity within the coke led to the highest coke degradation and the lowest coke strength after reaction. − The literature also reported that the sensitivity of the coke CRI and CSR determined from the quality control laboratories should be adequate because it depends on several operating parameters like heating rate, bulk density, moisture content, temperature, etc. ,− Also, many researchers have developed a prediction model based on various factors that can give insight into coke quality based on data mining techniques. − Therefore, in this study, the authors have conducted detailed research on factors affecting variability in coke reactivity test under the standard test condition for laboratory and commercial coke samples produced from stamp charge batteries using a specially designed sample holder probe. The study of inter-laboratory comparison test (ILCT) on CSR and CRI at different laboratories is also part of the present research.…”

Section: Introductionmentioning

confidence: 93%

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

et al. 2022

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The coke reactivity index and coke strength after reaction are critical parameters for the efficient operation of a blast furnace. Therefore, maintaining desired qualities of the produced coke as per coal blend chemistry and coke oven battery parameters is essential. However, the coke reactivity index (CRI) and coke strength after reaction (CSR) vary from laboratory to laboratory even though they have the same determination methodology. In the present investigation, a unique laboratory sample holder for reactivity test has been developed. The test method by Nippon Steel Corporation (NSC) has been compared with the newly developed sample holder method. The correlation between coke CRI and CSR has been studied with samples with a wide range of reactivity in the repeatability test. Results confirmed that the reactivity of coke highly depends on the reaction of individual coke pieces participating in the test. Despite undergoing strict process monitoring of the testing procedure of hot strength of coke, the present study confirmed that a variation of ±2 points in coke CSR and CRI does not affect coke quality in a single reading. The study also includes the influence of the number of coke pieces in the test sample to optimize the coke bed height. This paper described in detail the methodologies adopted, addressing the factors resulting in differences in CRI/CSR values within the same coke.

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