Numerical Simulation Of Erosion Status Of Blast Furnace Hearth

The hearth is the limiting link of the life of the blast furnace,and the degree of erosion of the hearth directly determines the life of the blast furnace.The high-temperature molten iron in the blast furnace hearth is in direct contact with the lining of the hearth,and a large temperature difference is formed under the forced cooling of the cooling water outside the hearth,and the generated thermal stress destroys the original physical properties of the refractory brick of the hearth.At the same time,physical and chemical reactions occurring during the smelting process will also erode the refractory bricks of the hearth.Therefore,a blast furnace is selected to establish a blast furnace hearth erosion model,and the degree of erosion is studied and calculated.The research results are as follows:1)According to the data extracted from a blast furnace production site,the heat transfer mode and erosion condition of the blast furnace hearth are analyzed: the main mode of heat transfer in the hearth is heat conduction heat transfer,and the erosion condition is axisymmetric along the axis center line.2)Based on the principle of heat transfer,large plate theory and long cylinder theory,the theoretical calculation of the erosion condition of the blast furnace hearth is carried out.The results show that the bottom of a blast furnace hearth has been eroded,and the erosion at the bottom of the furnace is the first layer of corundum.The stone bricks are located at the center of the furnace bottom;the ceramic cups on the side walls of the hearth are completely eroded,and the severely eroded parts are in the second section of the cooling wall of the side wall of the hearth.3)Based on the finite element method theory,the numerical simulation of the erosion condition of the blast furnace hearth is carried out.The results show that the temperature of the molten iron in the blast furnace hearth is cooled by the cooling water,and the cooling intensity of each cooling wall is different.The speed is different;the refractory material of the lining of the blast furnace is different,and its own properties are different,resulting in different temperature transmission speed;the minimum residual thickness of the carbon brick on the sidewall of the hearth is at least 1080 mm,and the minimum residual thickness of the carbon brick at the bottom of the furnace is 2035 mm.Figure 29;Table 18;Reference 84.