Heat Transfer Simulation Of Bf Cast Iron Cooling Stave And The Determinant Method For Liners Gas Gap Of Hearth

The long life of blast furnace has been the important sign and component part of the progress of modern puddling technology. For the improving of productivity and reducing of the cost of puddling production, the problem of improving the life of blast furnace has been prominent. According as the survey of the life of BF in our country, cooling equipment design and manufacturing quality is one of the important factors that impacts the longevity BF. The last blast furnace cooling equipment design is based on experience or damaged survey, with the continuous development of the heat transfer technology and theory and application, in addition, the continuous deepening of People's understanding on the cooling equipment, application of heat transfer numerical calculation of the structural parameters of the cooling equipment optimization has become possible. In this paper, the cooling equipment (cast iron cooling stave) now widely used in China's major steel mills has been used as a heat transfer modeling to analysis.In the current domestic steel mills, cast iron cooling stave also have a wide applications range. In this paper, the large-scale finite element common software ANSYS has been used to analyze the heat transfer of cast iron cooling stave of blast furnace under steady-state, through the analysis, the distribution of temperature,heat flux and temperature gradient of cooling stave under steady-state has been obtained, consequently to discover the places where should be paid attention to present under working condition, and it also could be a reference for future maintenance and design of stave. Besides, the influence of variables such as water scale,water velocity,gas clearance layer,coating layer,contact rate on the temperature field of BF cooling stave have been discussed, and the APDL parameters of influence factors also have been achieved, which will make analysis easier. At the same time, the theoretical calculation results are simulated by using software MATLAB, and the influence of variables will be easy to see.The heat structure of blast furnace hearth is composed of refractory bricks and filling material and cooling stave and furnace shell. In service, the structure of blast furnace will be subject to fluctuations in heat load and furnace pressure, and the cracks and crannies will turn up in filling material. When the cracks and crannies turn up in filling material, the resistance of structure heat transfer will increase, the lining temperature will lead to abnormal increase, the Slagging of heat surface of lining will lead to fall off, even the lining will direct contact with molten iron, and suffer from abnormal erosion. The early detection of gas gap in lining and using grouting to eliminate gas gap is an important matter to prolong the life of BF. In this paper, according to the theory of one dimensional radial heat conduction, the problem of linings gas gap of blast furnace hearth is discussed, with the heat conduction characteristic of blast furnace hearth. The determinant method and index of blast furnace hearth gas gap are given. The method of judging integrality of blast furnace hearth is discussed and the calculation example indicates that the method in this paper is feasible.