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Golovko M.B.,Ukrainian Coal Chemistry Institute
Coke and Chemistry | Year: 2015

To study the relation between the chemical composition and melting point of coal ash, 33 samples of coal from the Western Donets Basin are studied. The melting coefficients proposed previously for ash are analyzed in relation to the chemical composition of Western Donets Basin coal, and the correlations between these coefficients and the melting point of the ash are analyzed. A new ash-melting index Iam is proposed for predicting the flow temperature of ash from Western Donets Basin coal. The corresponding equations may be used to calculate the expected flow temperature of the ash, with sufficient accuracy. The results are also of interest in predicting the reactivity CRI and postreactive strength CSR of coke, since the chemical composition and melting point of the ash largely determine those parameters. © 2015, Allerton Press, Inc. Source


Fidchunov A.L.,Ukrainian Coal Chemistry Institute
Coke and Chemistry | Year: 2015

The production of coke with improved reactivity CRI and postreactive strength CSR calls for higher coke-discharge temperatures; that will inevitable be associated with increased emissions of nitrogen oxides (NOx). The influence of the air excess and temperature in the heating channels on the quantity of nitrogen oxides in the system is studied experimentally. The influence of the gas leakage from the coke ovens to the heating system and the purity of the coke-oven gas used for heating on the NOx formation is demonstrated. © 2015, Allerton Press, Inc. Source


Ulanovskiy M.L.,Ukrainian Coal Chemistry Institute
Coke and Chemistry | Year: 2014

To standardize the terminology used in technical journals and reference books on coal and coke chemistry, the evolution of certain terms is traced over several decades. Despite standards regarding terms and definitions, nonstandard expressions such as the content of volatiles, calorific value, reflectivity, hot strength, cold strength, and screen composition may be found in published materials. Definitions for quality and property are discussed, as well as two new terms: the potential reactivity of coke and the coking potential. © 2014, Allerton Press, Inc. Source


Ulanovskiy M.L.,Ukrainian Coal Chemistry Institute
Coke and Chemistry | Year: 2014

In a recent issue of this journal, Malyi described experiments on the modification of DG coal for its subsequent use in coking batch in place of G coal. Analysis of that paper shows that, contrary to Malyi’s statements, there is no shortage of G coal, because the Donets Basin comfortably meets the demand. The model mixture that Malyi uses for modification is complex in composition and contains considerable sulfur. He does not state its properties or the available reserves. Malyi’s ideas regarding the pyrolysis of coal are shown to be very contradictory, while his experimental data prompt skepticism, since the measured ash content, total sulfur content, and clinkering properties of the batch differ from those calculated on the basis of the properties and proportions of the batch components. When using batch that contains modified DG coal in place of G coal, the coke yield is reduced, and its quality is impaired. These findings support the conclusion that Malyi’s research is unnecessary, unpromising, and unworthy of further consideration. © 2014, Allerton Press, Inc. Source


Ulanovskiy M.L.,Ukrainian Coal Chemistry Institute
Coke and Chemistry | Year: 2014

Literature analysis shows that the physical significance of the equation from which the index Bb is calculated does not support its description as the ash basicity index. For quantitative assessment of the coal’s mineral component, which has an important influence on the coke quality—specifically, on CSR and CRI—the potential reactivity of coke (CRP) is recommended as a better characterization of the index Bb. Three- and two-parameter versions of the formula for CRP are presented. Models of the relation CRP = f(Ib) are developed for different parameter ranges. It is found that CRP and Ib are not analogs. Therefore, in the development of resources for the production of high-quality coke (in terms of CRP and CRI), these parameters should both be used. © 2014, Allerton Press, Inc. Source

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