Researchers have identified the underlying causes of Eskom’s high failure rate.
For the time being at least, coal-fired boilers remain the backbone of Eskom’s electricity generation fleet.
This corrosion inevitably results in a rupture and requiring that the whole unit be shut down for maintenance. . One can only assume that this number has been rising since then, with 2022 by far our worst year of load-shedding ever. Professor Josias Van Der Merwe, the Head of School at the Wits School of Chemical and Metallurgical Engineering, and K.G. Moloko, a postgraduate researcher in that school, have conducted a range of chemical analyses on boiler tubes from Eskom power stations to determine the mechanisms and causes behind theirThey found that the main culprit is sulphidation, a chemical process that degrades steel through the formation of brittle compounds of iron and sulphur.
Eliminating or mitigating the chemical pre-conditions for high failure rates, therefore is a crucial first step that must be taken for Eskom to start working its way back toward a functioning coal fleet.The first root cause of these chemical conditions is high sulphur content in the coal fed to the burners.
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