公开(公告)号：EP2881196A4

公开(公告)日：2015-08-19

申请号：EP13825044

申请日：2013-07-23

申请人： JFE STEEL CORP

发明人： ARAMAKI NORICHIKA ,  OHNO HIROYUKI ,  TAWA TOSHINORI ,  IKAGAWA TORU ,  TOISHI KEIGO ,  MIKI YUJI

IPC分类号： B22D11/128 ,  B22D11/041 ,  B22D11/12 ,  B22D11/16 ,  B22D11/20

CPC分类号： B22D11/1206 ,  B22D11/041 ,  B22D11/1282 ,  B22D11/208

公开(公告)号：EP3279340A4

公开(公告)日：2018-02-07

申请号：EP16772595

申请日：2016-03-25

申请人： JFE STEEL CORP

发明人： TAKAHASHI YUKIO ,  AMANO SHOTA ,  TAWA TOSHINORI ,  UCHIDA YUICHI ,  MIKI YUJI

IPC分类号： C21C5/35 ,  C21C5/46 ,  C21C5/48

CPC分类号： C21C5/35 ,  C21C5/46 ,  C21C5/48

摘要： [Task] It is to provide a method of operating a top and bottom blowing converter which is capable of suppressing oscillation of a converter and generation of duct and also suppressing wear of furnace wall refractory in a decarburization refining with a top and bottom blowing converter. [Solution] A method of operating a top and bottom blowing converter by using a top-blown multihole lance having a plurality of lance nozzles for jetting oxygen gas, jetting oxygen jets from the lance nozzles at a nozzle tilting angle inclined with respect to a center axis of the top-blown multihole lance, disposing n bottom-blown tuyeres in a bottom of the converter and blowing an agitating gas from the bottom-blown tuyeres, wherein an interference rate (IR) showing an involving degree between a hot spot formed by impinging the oxygen jet jetted from the top-blown multihole lance to a bath surface of molten iron and an agitating gas floating region formed on a bath surface of molten iron by blowing and floating the agitating gas from the bottom-blown tuyeres in molten iron is not more than 0.7.