Research and practice of intensified operation on BF with high top pressure
With increase in the high top pressure,the BF iron-making process has obtained obvious improvement in China,and the intensified operation on BF also has been unprecedentedly increased.Apparently,this technology of intensified operation on BF with high top pressure has been widely adopted and recognized by industry.Neverthe-less,the systematic theoretical research about this technology is relatively scarce currently,and the available research basically focused on the effect of high top pressure on the volume and flow rate of gas in BF.Therefore,based on the actual production,the impact mechanism of high top pressure on the smelting process of BF is system-atically studied in this paper.Firstly,the effects of high top pressure on smelting intensity,lumpy zone,the pressure difference of burden columns,the distribution of gas flow and fabric,the activity of tuyere and hearth,the discharge of iron and slag,and the reaction of non ferrous elements are elaborated.Secondly,the actual level of different bosh gas index under high top pressure operation is statistically analyzed,and the revision suggestions also are proposed for the control standards of bosh gas index.It is point out that the relatively reasonable bosh gas indexes of BFs about 3 000,2 000-3 000,and 1 000-2 000 m3 is 58-66,58-70 and 58-85 m/min respectively.Finally,the theoreti-cal research on high top pressure technology above has been applied and verified in the production of two 1 500 m3 BFs at Tangyin Company of Hebei Iron and Steel Group.Specifically,on the basis of successful blow-on and produc-tion,the intensified operation technologies mainly include high top pressure,large air volume,high oxygen enrich-ment,and low furnace temperature are used by the two BFs,as a result,the smelting of BF has been effectively strengthened,the various technical and economic indicators of BF also have been rapidly improved,and the success-ful application of intensified operation on BF with high top pressure has been achieved,which could provide certain reference significance and promotion value.
BFhigh top pressurepressure difference of columnintensified operationindex of bosh gas
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