Tapping Model And Numerical Calculation Of Blast Furnace Hearth

The blast furnace is a great equipment and facility in steel production, and its construction and maintenance cost is huge. Extending the life of a blast furnace can significantly reduce production costs, and achieve greater economic efficiency. During blast furnace working, it usually should replace refractory materials and repair blast furnace lining to protect the security and integrity, but it is difficulty for bottom and hearth of blast furnace. Because inside linings and hot metal physical contact directly, the erosion of linings can not be avoided, and And along with work time, this is more and more serious. The local wreck of hearth can result in the repair of blast furnace. So, the hearth is the major restriction of blast furnace.The blast furnace is a reactor of storing hot metal, Its structure is consisted of refractory linings, cooling staves and steel shells. It’s chiefly function is to fill high temperature hot metal and ensure the hot metal flow from side hole. During hearth’s cyclical process of iron, scour of hot metal, thermochemical reaction and thermal stress are considered as the major cause for blast furnace hearth erosion.Though equivalent replacement of convective heat transfer boundary of water pipe surface in furnace hearth cooling stave and blast furnace shell, hearth furnace shell and the bottom were transfer with convection heat; According to Thermofluid Dynamics and enthalpy-porosity method of Computation Fluid Dynamics, the two and three dimensional steady state tapping model of blast furnace hearth was established, including a variety of iron tapping system such as heat transfer and solidification of hot metal, thermal resistance of linings, cooling condition, permeability of iron column, hydrostatic pressure and so on. Temperature field and iron flow field and slagging situation of hot surface were analyzed in this case. According to tapping process of three-dimensional steady state, shear stress and temperature distribution of hot face lining were calculated; According to principles of erosion, erosion of lining surface distribution was qualitatively analyzed. The process of iron blast furnace hearth was simulated and calculated more completely and more perfectly though considering a variety of iron tapping system.Three-dimensional morphology of erosion that hot iron surface temperature of hearth bottom and hearth wall reached the freezing temperature of infiltration (the operation model) with hydrostatic pressure of operating pressure was calculated by using the method of replacement of mutual unit and lining cells simulating1150℃isothermal erosion-line movement. Its temperature and iron water field was analyzed. According to1150℃isothermal erosion line, bottom and hearth wall lining erosion was analyzed. The influence of factors to operation model of blast furnace hearth was discussed, for example, thermal conductivity, convection heat transfer coefficient etc. It has practical significance for hearth design and evaluation.The numerical results of the two and three dimensional steady state tapping model of blast furnace hearth and operation model of blast furnace hearth can provide complete simulation process and methods for lining design and life design of blast furnace hearth.