The Heat Transfer Balance Curve’s Calculation Of Blast Furnace Hearth

The blast furnace is a important production equipment of steel smelting, and the cost of construction and maintenance is huge. With the rapid development of economy and the advancement of large-scale blast furnace of china, People pay more and more attention to the life of blast furnace. And the life of blast furnace hearth is an important effect factor of the blast furnace’s overall life.So prolonging the life of blast furnace hearth can reduce the cost of smelting and make more economic benefits. The iron furnace bottom is direct contact with high temperature iron in the process of Tapping iron, and the erosion is an important factor of furnace hearth’s breakage. So looking for reasonable and effective research methods have important significance to improve the level of blast furnace process control.This article give an analysis of the blast furnace hearth’s erosion boundary through the studies of heat transfer balance curve. Usually take the1150℃isothermal as the erosion boundary’s estimate using heat transfer theory in the current studies, that is iron’s solidification line. We control the1150℃isothermal in a certain position distribution through the reasonable cooling and the protection of slag skin layer. There is a certain practical value on the design and lifetime of furnace hearth.The structure of the furnace hearth are quite complex. To save time and computing resources, according to the principle of heat transfer, The paper calculates heat transfer coefficient’s equivalent conversion of hearth wall and bottom convection and simplified equivalently the furnace hearth cooling walls, which greatly improve the efficiency of the analysis and calculation.Established the calculation model of furnace hearth in1150℃isothermal for the criterion of erosion. The heat conduction theory and lined with unit and the molten iron unit substitute mutually erosion simulation method of automatically move boundary. We realized the furnace hearth’s fast reconstruction of3d theory operation furnace type’s1150℃isothermal and get the erosion morphology of ideal tapping iron condition. In addition, Discussed the influence of the viscosity changes and furnace wall and bottom’s convective heat transfer coefficients.The tapping furnace hearth of3d design prototype can simulate truly the molten iron’s circulation flow and so on. Analyzed the symmetry plane’s1150℃heat transfer balance line of three dimensional design furnace of furnace. As the design prototypes for research object, Made use of wear model and discussed the molten iron scouring flow’s influence of the furnace hearth by liquid-solid two-phase flow and discrete phase theory of fluid mechanics. In addition, Compared the scour erosion of blast furnace hearth in different floating height of deadman and different porosity of deadman. Which have certain exploring significance to the lifetime of blast furnace hearth.