|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Formation of Carbon Build-Up on the Flue Wall of Anode Baking Furnace
||Zhaohui Wang, Arne Petter Ratvik, Tor Grande, Stein Rørvik
|On-Site Speaker (Planned)
A hard carbon build-up layer often formed on the flue wall surface in anode baking furnaces. The layer accumulated over thermal circles and regularly needed to be removed mechanically to ensure sufficient space for the anodes between flue walls. The underlying mechanisms are still unknown, but the extent of the carbon build-up varies from plant to plant. Build-up on the flue wall from an autopsy of an open top furnace has been studied. Microstructure and phase compositions of carbon build-up, especially at the refractory interface, have been studied by optical microscopy, X-ray computed tomography, SEM/EDS, and XRD. Pyrolytic carbon was found to be the main carbon source in carbon build-up layer. The transport of silicon source from the refractory material to the flue wall surface is proposed to contribute to the formation of carbon build-up. Proposed formation mechanisms of carbon build-up and the reaction schemes are supported by thermodynamic calculations.
||Planned: Light Metals