Abstract：
:Key characteristics of coal samples from the supply stock to the newly commissioned South African National Power Utility's (Eskom's) Medupi Power Station - which receives its supply coal from the Waterberg coalfield in Lephalale (Limpopo Province, South Africa) - were evaluated. Conventional coal characterisation such as proximate and ultimate analysis as well as determination of sulphur forms in coal samples were carried out following the ASTM and ISO standards. Coal was classified as medium sulphur coal when the sulphur content was detected in the range 1.15-1.49 wt.% with pyritic sulphur (≥0.51 wt.%) and organic sulphur (≥0.49 wt.%) accounted for the bulk of the total sulphur in coal. Maceral analyses of coal showed that vitrinite was the dominant maceral (up to 51.8 vol.%), whereas inertinite, liptinite, reactive semifusinite and visible minerals occurred in proportions of 22.6 vol.%, 2.9 vol.%, 5.3 vol.% and 17.5 vol.%, respectively. Theoretical calculations were developed and used to predict the resultant SO2 emissions from the combustion of the Waterberg coal in a typical power plant. The sulphur content requirements to comply with the minimum emissions standards of 3500 mg/Nm3 and 500 mg/Nm3 were found to be ≤1.37 wt.% and ≤0.20 wt.%, respectively.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Makgato SS,Chirwa EMNdoi
10.1016/j.jenvman.2017.06.049subject
Has Abstractpub_date
2017-10-01 00:00:00pages
294-302eissn
0301-4797issn
1095-8630pii
S0301-4797(17)30636-9journal_volume
201pub_type
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