Influence of carbon structure and mineral association of coals on their combustion characteristics for pulverized coal injection (PCI) application |
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| Authors: | Sushil Gupta Veena Sahajwalla Yaser Al-Omari David French |
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| Affiliation: | (1) the School of Materials Science and Engineering, The University of New South Wales, 2052 Sydney, NSW, Australia;(2) the School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW, Australia;(3) TAFE International WA, Perth, Australia;(4) CSIRO Energy Technology, Lucas Heights Science and Technology Centre, Private Mail Bag 7, 2234 Bangor, NSW, Australia |
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| Abstract: | The influence of carbon structure and mineral matter of three pulverized coals on their char characteristics including reactivity
was studied under a range of combustion conditions in a drop tube furnce (DTF) and thermogravimetric (TGA) furnace for PCI
application. Physical and chemical properties of coals and their combustion derivatives were characterized by automated reflectogram,
X-ray diffraction, scanning electron microscope, and BET N2 adsorption. The QEMSCAN technique was used to characterize the heterogeneous nature of minerals of discrete coal particles.
The TGA char reactivity was related to the proportion of coal particles displaying strong association of calcium/sulfur phases
with carbon matrix to highlight the catalytic influence of minerals on char reactivity at low temperatures. The study suggested
that during DTF combustion tests at 1200 °C, char reaction rates might have been catalyzed by coal minerals, particularly
due to illite and its association with carbon. Under the same combustion conditions, most of the coal minerals did not transform
significantly to slag phases. Coal burnout was found to improve significantly in a combustion temperature range of 1200 °C
to 1500 °C. The improvement of coal burnout with temperature appeared to be influenced by coal properties, particularly as
a function of the chemical nature of minerals, as well as the degree of associations with other minerals. The study implies
that coals with similar mineral compositions might not necessarily reflect similar combustion behavior due to the differences
in their associations with other phases. The study highlighted the significance of the characterization of the heterogeneity
of coal particles including mineral associations for a comprehensive and reliable assessment of the combustion performance
of PCI in an operating blast furnace.
QEMSCAN is a trademark of Intellection Pty Ltd., Milton, Queensland, Australia. |
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