Modeling of the deposit formation in channel-type induction furnaces

U. Bethers¹ - A. Jakovics¹ - N. Jekabsons¹ - I. Madzulis¹ - B. Nacke²

¹ Latvian University, Riga, Latvia
² ABB Dortmund, Dortmund, Germany

Abstract
The deposit (build-up) formation (clogging) reduces the lifetime of induction channel furnaces (ICF) significantly. Practical applications indicate a wide spectrum of build-up growth speed and spatial distribution in the ICF. A multi-component build-up formation model has been developed which describes qualitatively the appropriatenesses of the deposit location and growth speed dependent on the temperature, flow velocity, surface roughness, etc. The time-scales of the build-up process are evaluated according to the model of diffusion controlled crystal growth. Concentration boundary layers are estimated by means of analysis of the HD boundary layers in the different sub-regions of the furnace. The closed mathematical model is developed for the channel of ICF on the above basis and consideration of the buoyancy driven transit flow being responsible for the heat exchange with the melt bath.