Effect of deadman state on circumferential flow of hot metal and side-wall shear stress distribution in furnace hearth
Numerical simulations were used to analyze the flow characteristics of the hot metal in the furnace hearth under different deadman states. The effects of the deadman porosity, blocked center deterioration,and position on the circumferential flow of hot metal and side-wall shear stress distribution in furnace hearth were studied. The results show that the maximum shear stress on the side-wall of the blast furnace hearth underdifferent deadman states is located near 1.5m below the taphole plane, while the shear stress on the side-wall of the hearth is higher in the circumferential area from 0° to 20° below the taphole plane. The maximum shear stress on the side-wall of the furnace hearth is reduced from 9.045 mPa to 6.530 mPa by increasing the deadman porosity from 0.2 to 0.4, which can effectively increase the flow space of the hot metal in the furnace hearth and slow down the scouring erosion of the side-wall by the circumferential flow of hot metal;when the blocked center area ratio in deadman increases from 0.7 to 0.9, the maximum shear stress of the hearth side-wall increases from 9. 492 mPa to 22.02 mPa, and the scouring erosion of the side-wall by the circumferential flow of hot metal. In addition, the floating of deadman hasno significant effect on the shear stress relief of the furnace hearth side-wall. Therefore, improving the blast furnace raw materials and operating conditions, and increasing the deadman porosity and central liquid permeability can effectivelyreduce the scouring erosion of the furnace hearth side-wall by the circumferential flow of hot metal and extend the blast furnace life.
blast furnace hearthdeadmanhot metal circumferential flowside-wall shear stress
万方数据
维普
