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Miroshnichenko D.V.,Ukrainian State Coal Chemistry Institute | Drozdnik I.D.,Ukrainian State Coal Chemistry Institute | Kaftan Y.S.,Ukrainian State Coal Chemistry Institute | Bidolenko N.B.,Ukrainian State Coal Chemistry Institute | Desna N.A.,National Metallurgical Academy of Ukraine
Coke and Chemistry | Year: 2012

The use of oxidized coal in coking batch increases the analytical moisture content and packing density; impairs the plasticity and ductility; reduces the carbon and hydrogen content; increases the oxygen content; reduces the gross coke yield and the yield of tar, benzene, and unsaturated compounds; increases the yield of carbon dioxide, pyrogenetic tar, and inverse coke-oven gas; and impairs coke quality. Adding oxidized coal in the initial stage of oxidation (Δt < 6°C) to the batch does not lead to significant change in coke quality. © 2012 Allerton Press, Inc.


Desna N.A.,National Metallurgical Academy of Ukraine | Miroshnichenko D.V.,Ukrainian State Coal Chemistry Institute
Coke and Chemistry | Year: 2011

A literature review shows that the oxidation of coal changes its granulometric composition, packing density, moisture content, and clinkering properties, the quality of the resulting coke, and the yield of coking byproducts. On account of the increased proportion of oxidized coal in coking batch, research is expedient in order to formulate recommendations regarding its use. © 2011 Allerton Press, Inc.


Miroshnichenko D.V.,Ukrainian State Coal Chemistry Institute | Drozdnik I.D.,Ukrainian State Coal Chemistry Institute | Kaftan Y.S.,Ukrainian State Coal Chemistry Institute | Ivanova E.V.,Ukrainian State Coal Chemistry Institute | And 2 more authors.
Coke and Chemistry | Year: 2012

The oxidation of coal of different ranks and from different basins is practically the same. There are three main stages: the initial stage, intense oxidation, and saturation. The boundary Δt = 6°C is assumed to mark the transition from the initial stage to intense oxidation. This transition sharply impairs the coal properties. In the initial stage, the oxidation rate is different for coal of different metamorphic development and increases with the yield of volatiles. © 2012 Allerton Press, Inc.


Miroshnichenko D.V.,Ukrainian State Coal Chemistry Institute | Balaeva Y.S.,Ukrainian State Coal Chemistry Institute
Coke and Chemistry | Year: 2011

Formulas for predicting the higher heat of combustion of coal on the basis of technical analysis (the yield of volatiles), elementary analysis, and petrographic analysis are verified. It is found that the formulas are only valid for the samples used in their derivation. Statistical analysis of data for coal from the Donetsk and Lvov-Volynsk basins shows that the higher heat of combustion of such coal is most accurately described by a mathematical formula in which the predictors are petrographic characteristics of the initial coal components, including the reflection coefficient of vitrinite. The mean higher heat of combustion may be determined for vitrinite at different metamorphic stages (for ranks from D to T) and also for liptinite and the sum of fusinized (lean) components in Ukrainian Donetsk and Lvov-Volynsk coal. © 2011 Allerton Press, Inc.


Sosnova E.B.,Ukrainian State Coal Chemistry Institute | Poltoratskaya E.A.,Ukrainian State Coal Chemistry Institute
Coke and Chemistry | Year: 2011

The additivity of various measures of clinkering is verified for coal blends that contain imported coal. © 2011 Allerton Press, Inc.


Sytnik A.V.,Ukrainian State Coal Chemistry Institute | Kuznichenko V.M.,Ukrainian State Coal Chemistry Institute
Coke and Chemistry | Year: 2011

Laboratory, semiindustrial, and industrial methods of determining the expansion pressure of coking batch are subjected to critical analysis. There is no standardized method by which the expansion pressure may be calculated within a single apparatus over a wide range of packing densities-from loose charge to rammed charge. © 2011 Allerton Press, Inc.


Golovko M.B.,Ukrainian State Coal Chemistry Institute | Miroshnichenko D.V.,Ukrainian State Coal Chemistry Institute | Kaftan Y.S.,Ukrainian State Coal Chemistry Institute
Coke and Chemistry | Year: 2011

An analytical review reveals that, for current batch with an elevated content of petrographically diverse coal and with organic additives, it is very difficult to predict the coke yield and basic coking byproducts from the yield of volatiles. A more promising approach is prediction on the basis of the elementary and petrographic composition of the coal batch. © 2011 Allerton Press, Inc.


Sosnova E.B.,Ukrainian State Coal Chemistry Institute
Coke and Chemistry | Year: 2010

The results for the clinkering properties obtained on the basis of State Standard GOST 9318-91 (ISO 335-74) and the ISO 15585 standard are compared. © 2010 Allerton Press, Inc.


Golovko M.B.,Ukrainian State Coal Chemistry Institute | Drozdnik I.D.,Ukrainian State Coal Chemistry Institute | Miroshnichenko D.V.,Ukrainian State Coal Chemistry Institute | Kaftan Y.S.,Ukrainian State Coal Chemistry Institute
Coke and Chemistry | Year: 2012

Mathematical models are developed for predicting the yield of coking byproducts on the basis of elementary and petrographic analysis of the coal batch. © 2012 Allerton Press, Inc.


Drozdnik I.D.,Ukrainian State Coal Chemistry Institute | Kaftan Y.S.,Ukrainian State Coal Chemistry Institute | Miroshnichenko D.V.,Ukrainian State Coal Chemistry Institute | Bidolenko N.B.,Ukrainian State Coal Chemistry Institute
Coke and Chemistry | Year: 2016

Coking coal of the same rank from different countries and fields may be distinguished in terms of use value by rating on the basis of seven technological and petrographic characteristics that determine the coke yield and properties: the ash content Ad; the total sulfur content St d; the yield of volatiles Vdaf; the plastic-layer thickness y; the vitrinite reflection coefficient Ro; the content of vitrinite-group macerals Vt; and the basicity index Bb. A range of values and a rating (on a scale from 1 to 10) are established for each of these parameters. Each rating corresponds to a particular score (from 0.1 to 1.0). Ranges of Ad, St d, Vt, and Bb are established for the whole metamorphic series, while ranges of Vdaf, y, and Ro are established for individual ranks and groups of ranks. Altogether, 105 coking coals from Ukraine, Russia, the United States, Australia, and Canada that are used at Ukrainian coke plants are investigated. The range of rating scores and their mean values are determined for individual coal ranks and groups. As an example, three bituminous coals from Ukraine, the United States, and Australia are compared by the proposed method. This method permits objective assessment of the technological value of coal within a single rank and the selection of the best purchase option. © 2016, Allerton Press, Inc.

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