Physical and Mathematical Modeling of Transient Thermal and Liquid Flow Inside a Blast Furnace Hearth during the Tapping Period

摘要

Fluid dynamic aspects of iron and slag in the hearth of the blast furnace are important in respect of the campaign of the hearth refractories in general and especially in the region of the tap holes As is well known the wear of refractories is due to various factors such as erosion and dissolution of carbon by liquid iron; penetration of liquid metal through the open pores, cracks and fissures; degradation by carbon monoxide carbon, zinc and alkali, oxidation of carbon blocks in the tuyere region due to hot air blown. It is also influenced by the blast temperature; oxygen enrichment; type and rate of injection of the auxiliary fuel; positioning and permeability of the dead man, positioning and form of the softening and melting zone, degradation of the particles of coke, length, inner diameter and inclination of tap holes. The wear by erosion is the main factor determining the longevity of the hearth linings.