Study On Heat Flow Intensity And Furnace Condition Of Blast Furnace

There have a series of complex physical and chemical reactions been occurring inside of BF with the smelting, is an indispensable process in normal production of the BF. The blast furnace has been living in a situation where it needs to experience the harm from the erosion of high temperature gas and charge, liquid slag iron, alkali metal and zinc, as well as thermal shock damage and so on, in this process. However, these risks will affect the normal smelting production of BF directly. The changes of the BF’s heat flux can show us the unviewable furnace conditions including the erosion of lining, gas distribution, furnace accretion etc. Meanwhile, these variations are closely related to smelting furnace conditions. Therefore, there has a significant meaning to study the relationships about heat flux and conditions of BF combining with the reality of No.1blast furnace in a steel plant, and then give iron workers some help to regulate furnace conditions.The paper has taken furnace structures and smelting reality of No.1BF into comprehensive consideration, starting from the cooling of BF, and through researching on its heat transfer mathematical models about bad working environment areas have been established to make clear the relations between heat flux and conditions of BF from theory, and then, the erosion circumstance should be known through calculating. Next, based on the models and combined with actual production as well as furnace working as data, appropriate heat flux within related parts under the smooth operation of BF can be obtained. In addition, we need to analyze the heat flux distribution via making diagraph under some wrong furnace status, and compare the case with smooth conditions. At last, the suitable heat flux can ensure BF in a good working has been caught by us. Consequently, we also can make use of these study results to guide the actual manufacture, so as to make furnace conditions smoothly for a long time. Conclusions of research as follows:(1) The heat flux of bottom makes blast furnace working well ranging from2500W/m2to9800W/m2combining with smelting and theoretical model, but may as well keep around3000W/m2at present.(2) If you want to get a fine operating mode of No.1BF for a long time, you should maintain the heat flow rate at7500～23500W/m2. With considering current smelting, you’d better keep it in9000W/m2more or less.(3) On condition that the copper staves have been applied to bosh zone, the best of slag skull thickness is about40mm for a fine working status. The heat flux of bosh need to keep around40000-70000W/m2, but holding in50000W/m2is the best. (4) The slag skull thickness of belly is the same with bosh area for the same copper staves. The heat flux in belly should be controlled in30000～45000W/m2, but the best is about40000W/m2.