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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN='8th ECIC & 9th ICSTI 2022':MAILTO:info@ecic-icsti.com
LOCATION:Room „Danzig“
SUMMARY:Influence of coal grain composition and maceral associations on fluidity development during the coking process
DESCRIPTION:Maceral composition is one of the key parameters used to assess coals and to predict coke quality. However, coal grains are often a mixture of different macerals and mineral matters. The development of fluidity in coal grains depends on grain size and the degree of maceral association. It is important to determine the composition of coal grains to understand the fluidity drivers. Coal Grain Analysis (CGA) was used in this study to determine the maceral compositional information of individual coal grains for 4 metallurgical coals varying in rank and maceral composition. The thermoplastic behaviour of coal samples was tested using a Gieseler plastometer and the custom-designed permeability/dilatation testing apparatus and a 4kg dual-heated coke oven.
The experimental results showed that coal inertinite content and the degree of association between inertinite (and minerals) and vitrinite greatly influence coal thermoplasticity. Coals with a lower vitrinite particle size and a higher degree of association of vitrinite with inertinite and minerals showed lower dilatation and higher permeability. It was postulated that coals with close maceral association are more prone to volatile gas escape during the plastic phase, effectively hindering bubble formation and growth and thermoswelling while also increasing the viscosity, leading to decreased Gieseler fluidity measurements. However, coals with different degrees of maceral associations showed similar internal gas pressures (IGP) in the 4kg dual heated coke oven and made strong cokes. The liquid phase present in the melt provided sufficient binder material to form strong cokes. Results suggest that some coals possess a higher “effective fluidity” than reported from standard Gieseler testing. On the other hand, coals that display limited maceral association and relatively high proportions of larger vitrinite prolific grains benefit from enhanced bubble growth and coalescence. The apparent fluidities of such coals are more accurately represented by standard Gieseler testing.

CLASS:PUBLIC
DTSTART:20220630T153500
DTEND:20220630T160000
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