Journal of the Southern African Institute of Mining and Metallurgy
On-line version ISSN 2411-9717
DONG, H; WANG, H.-J and CHU, S.-J. A methodology for determining the erosion profile of the freeze lining in submerged arc furnace. J. S. Afr. Inst. Min. Metall. [online]. 2014, vol.114, n.6, pp. 489-496. ISSN 2411-9717.
This paper presents a heat conduction model to determine the erosion profile of freeze linings in a ferronickel submerged arc furnace. Kirchhoff transformation was adopted to simplify the nonlinear equation governing heat conduction. The boundary element method (BEM) and Nelder-Mead simplex optimization method were employed to solve an inverse heat conduction problem. Erosion profiles could be obtained when calculated temperatures at sensor locations agreed well with measured temperatures. The model was validated by comparing the heat loss through the linings, which was calculated by BEM and integral operation after erosion profiles were obtained, with the value calculated from industrial data such as actual power consumption, tap-to-tap time, and ferronickel output. The optimal solution for the erosion profile could be acquired when the difference in heat losses calculated by these two methods is at a minimum.
Keywords : submerged arc furnace; freeze lining; erosion profile; boundary element method.