Characterization of the porous structure of cokes produced from the blends of three Polish bituminous coking coals

Krzesińska, M.; Pusz, S.; Smędowski, Ł.

doi:10.1016/j.coal.2008.11.002

Cited by 34 publications

(13 citation statements)

References 24 publications

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“…Their apparent density (ρ Hg ) was determined with mercury at 0.1 MPa in a Micromeritics autopore IV 9500 mercury porosimeter. From the true and apparent densities, the open porosity corresponding to pore sizes of less than 12m was calculated by means of the following equation [20]:…”

Section: Textural Characterizationmentioning

confidence: 99%

Improving the properties of high volatile coking coals by controlled mild oxidation

Vega

Fernández

Díaz-Faes

et al. 2017

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Four bituminous coals of the same rank but with different thermoplastic properties were oxidized at 40 and 50 ºC for one month. The chemical changes due to oxidation were studied by applying Gieseler plastometry, the free-swelling index (FSI), thermogravimetric analysis and Fourier transform infrared spectroscopy (FTIR). In general, oxidation at 50 ºC produced a greater impairment of coking properties, the different responses to oxidation depending on the parent coal. The main effects caused by oxidation were a loss of thermoplastic properties, a decrease in aliphatic hydrogen and a slight increase in groups with oxygen functionalities.Both the fresh and oxidized coals were carbonized in a movable-wall oven of 17 kg capacity and the quality of the resulting cokes was tested by means of the ASTM standard method. The results showed that, in certain cases, mild oxidation produced an improvement in coke quality. Oxidation also affected the porosity of the cokes, which may be related to the coke quality. It was found that the higher quality cokes had less macroporosity, whereas the lower quality cokes had a higher pore volume.

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Section: Textural Characterizationmentioning

confidence: 99%

Improving the properties of high volatile coking coals by controlled mild oxidation

Vega

Fernández

Díaz-Faes

et al. 2017

Fuel

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“…While the relationship observed in the slot-oven coke is unexpected, a recent study reported a positive relationship between CRI and surface area for cokes prepared using three Polish coals; however, the dependence between these parameters was not exactly linear. 24 Coke total porosity accounts for all pore sizes, microfissures, and cracks. Therefore, it indicates accessibility of oxidizing gases into the interior regions of the coke where gasification occurs.…”

Section: Resultsmentioning

confidence: 99%

Investigation of Coke Quality Variation between Heat-Recovery and Byproduct Cokemaking Technology

et al. 2017

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Coke structural properties that lead to coke quality difference between heat recovery and byproduct cokemaking technology are investigated. Coke fingers collected from two zones (bottom center and top center) of a commercial heat recovery oven were analyzed and compared to the coke produced from the same coal blend using a moveable-wall slot oven. Coke fingers were studied at set intervals, starting from the floor of the heat recovery oven through the top of the bed, and from the slot oven wall to wall. Coke strength after reaction (CSR) test, gas adsorption techniques, optical microscopy, and X-ray diffraction analyses were used to study the coke samples. Although exhibiting lower overall CSR compared to the heat-recovery oven coke, the slot oven produced a more uniform coke quality along the coke cake width, because of the narrow width and bilateral heating of the slot oven. The top-section coke of the heat-recovery oven displayed unique structural characteristics ascribed to the availability of free space atop this coke and the use of radiant heat to drive its coking process. The heat-recovery oven bottom center and slot-oven coke displayed low surface area and total porosity, indicating restrictive coke cake expansion. Limited swelling is attributed to the coal charge weight overlying the heat-recovery oven bottom coke and the constrained nature of the slot-oven chamber. However, the shorter coking time used in the slot oven disadvantageously deprives the slot-oven coke of sufficient time to fully develop its carbon structure; therefore, the heat-recovery oven cokes demonstrated better carbon structural development. For the slot-oven coke, carbon structural development seems to have a stronger impact on CSR than surface area does, while for the heat-recovery oven top center coke, surface area appears to be the parameter that most affects CSR.

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“…The dependence of the reactivity on the volume and surface area of the micropores has been noted in various studies [42,43]. Some relations between coke reactivity and S BET , calculated based on N 2 adsorption, can be found in [44,45] The nature of the porous structure, including the total pore volume, size distribution and morphology, has a significant impact on the strength and reactivity of the coke [46,47]. Generally, the coke strength decreases with an increase in the total pore volume [48].…”

Section: Coke Porous Structurementioning

confidence: 94%

Use of Alternative Raw Materials in Coke-Making: New Insights in the Use of Lignites for Blast Furnace Coke Production

2020

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This paper presents the results of studies on the possibility of using lignite to produce blast furnace coke. The aim of the investigation was to evaluate the influence of lignite addition (direct addition or incorporated into briquettes) on the textural, structural and quality parameters (NSC-CRI and CSR) of blast furnace coke. It was found that the introduction of lignite in briquettes (4.5% addition) allows coke to be produced that is characterized by equally high NSC parameters as for coke obtained without lignite addition for standard top-charged operation.

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Characterization of the porous structure of cokes produced from the blends of three Polish bituminous coking coals

Cited by 34 publications

References 24 publications

Improving the properties of high volatile coking coals by controlled mild oxidation

Improving the properties of high volatile coking coals by controlled mild oxidation

Investigation of Coke Quality Variation between Heat-Recovery and Byproduct Cokemaking Technology

Use of Alternative Raw Materials in Coke-Making: New Insights in the Use of Lignites for Blast Furnace Coke Production

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