Heat Transfer And Thermal-stress Finite Element Calculation Of Blast Furnace Hearth Wall

The long life of blast furnace has been the important sign and component part of the progress of modern pudding technology. For the improving of productivity and reducing of the cost of pudding production, the problem of improving the life of blast furnace has been prominent. According as the survey of the BF life in our country, breakage of fireproofs inner lining flake and craze of the furnace casing is one of the important factors that impacts the longevity BF.The heat structure of blast furnace hearth is composed of refractory bricks and filling material and cooling stave and furnace shell. The heat surface of the blast furnace wall contacts high temperature furnace gas and is cooled by cooling water, so it forms very high temperature gradient and heat load. And both structure swelling stress and temperature head stress is the main reason for damage occurred. So analyses of blast furnace hearth’s temperature distortion and thermal stress are the indispensable instrument to realize the microbial of the blast furnace. Through analysis the temperature and thermal stress of the blast furnace hearth under the workplace, it can guide the cooling stave design, manufacture and use and improves the life of blast furnace hearth, and it further extends the life of blast furnace.The paper is based on the structure characteristics of the furnace muti-shell and work and three-dimensional steady-state heat transfer and thermal elasticity theory, and uses cycle symmetric model to establish the heat transfer and thermal stress calculation model under the working state, the model is more precise than previous slab model. The finite element method is the most important mathematical tool for engineering analyses, because the main aim of this artical is to research thermal stress distribution of the partial crack furnace shell,adopting to finite element method could calculate temperature and stress. Inner lining erosion is inevitable while the BF is in service,, it will lead blast furnace wall temperure to increase, then thermal stress also increase. Blast furnace shell will get into plastic stress and temperature distortion. At this time,thermal stress and deformation are very complex on the area of blast furnace shell partial-crack. Establishing un-cracked and cracked shell of BF hearth model under the ANSYS platform, then impose the loads of the border conditions simulating actual situation, the results is even more similar to the actual situation.Aiming to temperature and thermal stress changes of cracking shells, then making comparison and finding out the reasons of leading to change, establishing relationship between cracked-shell and iner lining deformation, and the paper compares the cooling capacity at different structural parameters.These research is valuable for the design of blast furnace wall as well as disrepair of blast furnace shell.