Numerical Simulation Of Flow And Heat Transfer Of Molten Iron In Blast Furnace

Blast furnace is an important production equipment in iron and steel smelting,and its construction and maintenance costs are huge.During the process of Blast furnace production of hot metal,the direct contact between the lining and high temperature molten iron and the scouring of the molten iron to the hearth are the important reasons for the damage of the hearth.As the hearth inside the structure is very special,with a similar nature of the black box,blast furnace hearth inside the hot metal circulation and heat transfer conditions can not be measured Therefore,it is necessary to study the circulation and heat transfer state of the hot metal in the hearth and its influencing factors through mathematical simulation.Reduce the furace hearth molten iron circulation on the hearth side wall erosion and key parts of the temperature,to extend the purpose of the hearth life.In this paper,a 3-D tapping heat transfer model is established for the hearth of a 1500m3 blast furnace in a factory to study the change of operating conditions and the hot metal circulation and heat transfer in different furnace structures.The main contents of this paper are as follows:changing the position of plugging tuyere,the viscosity of molten iron,the height of floating dead column,the permeability of dead coke column and the depth of taphole:The thermal conductivity of asphalt bonded ramming material and resin bonded ramming material was measured by LFA-457 laser thermal conductivity meter,and the relationship between thermal conductivity and temperature of ramming material was measured.Finally,the equivalent heat transfer coefficient of resin ramming material was used to determine the equivalent furnace Cylinder cooling conditionsThe establishment of the form that contains the iron mouth design of the hearth furnace.The results show that the height of the dead column,the depth of the iron mouth,the influence of the two on the flow field of molten iron and the temperature field of the lining,and then get the influence of the two kinds of furnace structure.In order to alleviate the erosion of the lining of the hearth by changing the viscosity of the molten iron in the production(titanium furnace),blocking the tuyere area,the permeability of the coke column,Observed in the hearth hot metal circulation and heat transfer.The relationship between them and their influence on the flow field of molten iron and the temperature field of the lining are discussed,which provide important basis for prolonging the life of blast furnace.The three-dimensional iron-casting heat transfer model and the calculation flow of the hearth containing hot metal flowing heat transfer can be used to simulate the change of the depth of the iron mouth,the morphology of the lining erosion,the local tuyere blockage and the titanium mine protection structure.Under the iron flow and hearth heat transfer characteristics,in order to optimize the operation of the hearth,to extend the service life of the numerical analysis tools.