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Opportunities to improve the utilisation of granulated coals for blast furnace injection

Steer, Julian Mark, Marsh, Richard, Greenslade, Mark and Robinson, Andrew 2015. Opportunities to improve the utilisation of granulated coals for blast furnace injection. Fuel 151 , pp. 40-49. 10.1016/j.fuel.2014.12.060

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Abstract

Coal injection plays an important role to the economic success of ironmaking by substituting a portion of the coke input and improving the blast furnace productivity. Manufacturers are looking at opportunities to increase their coal selection options by using higher proportions of technically challenging lower volatile matter content coals; this paper investigates the kinetics, devolatilisation and burnout of these in granulated coal blends using thermogravimetric analysis (TGA) and a drop tube furnace (DTF). The char residue from the semi-anthracitic low volatile coal selected for this blending investigation had a much reduced reactivity at higher conversions which affected the blends in different ways. Burnout of the blends with the low volatile bituminous coals was improved by fragmentation of the granulated particles, but at longer residence times the lower reactivity of the more structurally ordered carbon in the semi anthracitic coal dominated. In contrast, the higher volatile coals showed improvements at low residence times corresponding to rapid volatile loss, but also showed non-additive blend improvement at longer residence times which may be explained by the more obvious presence of included minerals and the higher K/Al ratios associated with illite mineral phases known to improve burnout.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: Blast furnace; Granulated coal injection; Combustion; Devolatilisation; Blends
Publisher: Elsevier
ISSN: 0016-2361
Funders: Tata
Date of First Compliant Deposit: 21 January 2019
Date of Acceptance: 16 December 2014
Last Modified: 20 Oct 2019 14:43
URI: http://orca.cf.ac.uk/id/eprint/69107

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