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31. 发明专利

JP2000001714A TOP-BLOWN LANCE FOR REFINING MOLTEN METAL 失效
公开(公告)号：JP2000001714A
公开(公告)日：2000-01-07
申请号：JP17116598
申请日：1998-06-18
申请人： SUMITOMO METAL IND
发明人： TAGO YUKARI , HIGUCHI YOSHIHIKO
IPC分类号： C21C5/32 , C21C5/46
摘要： PROBLEM TO BE SOLVED: To restrain the spitting under high speed blowing condition by specifying the relation of angles formed between (z) axis and the projected lines of the nozzle axis to a (yz) plane and a (xz) plane, in the (xyz) orthogonal coordinate system defined so that the center axis of a lance having three or more of nozzles arranged at the same interval on the same circumference is regarded as the (z) axis and the outlet position of the nozzle is regarded as the (x) axis. SOLUTION: In the plan figure (a) of the six-hole lance 1, the projection figure (b) to the (xz) plane of the B-B cross section of the figure (a) and the projection figure (c) to the (xz) plane of the C-C cross section of the figure (a), the small diameter nozzle 3 is set at the center. In the (xyz) orthogonal coordinate system defined so that the lance center axis is regarded as the (z) axis and the outlet position of the nozzle is regarded as the (x) axis, the nozzles 2, in which the angle α formed between the (z) axis and the projected line of the nozzle axis to the (yz) plane corresponding to the twist of the nozzle and the angle β formed between the (z) axis and the projected line of the nozzle axis to the (xz) plane corresponding to the inclination in the outside direction of the nozzle, satisfy 0

32. 发明专利

JPH11246907A METHOD FOR CONTROLLING BLOWING IN CONVERTER 失效
公开(公告)号：JPH11246907A
公开(公告)日：1999-09-14
申请号：JP4923498
申请日：1998-03-02
申请人： NIPPON STEEL CORP
发明人： KITAMURA SHINYA , YAMAZAKI TSUYOSHI
IPC分类号： C21C5/32 , C21C5/46
摘要： PROBLEM TO BE SOLVED: To provide a means with which a molten iron temp. and carbon concn. during blowing are accurately and surely controlled without executing the measurement with a sub-lance on a top-bottom combining blown converter. SOLUTION: A thermo-meter 13 is set in a molten iron 2 in a converter 1, the molten iron temp. is continuously measured and one or two more among on oxygen feeding speed, an interval between a lance and the molten iron surface and the adding quantity of an auxiliary raw material for cooling, are adjusted based on the temp. information. Further, in addition to the above, a carbon concn. measuring means is set in the molten iron 2 to measure the carbon concn. and the controls of the molten iron temp. and the carbon concn. during blowing are executed based on these information of the temp. and the carbon concn. Furthermore, a means for preventing the invasion of outer air by tightly closing the furnace opening part of the converter 1 at the time of blowing, a means for measuring CO, CO2 and inert gas concns. in an exhaust gas and a means for supplying a prescribed quantity of the inert gas into the converter and/or into an exhaust gas duct at the upstream side from the exhaust gas composition measuring point, are set and decarburized quantity is estimated based on the component concn. in the exhaust gas and the flow rate of the inert gas.

33. 发明专利

JPH11158527A TOP-BLOWN LANCE FOR REFINING MOLTEN METAL 失效
公开(公告)号：JPH11158527A
公开(公告)日：1999-06-15
申请号：JP32616497
申请日：1997-11-27
申请人： SUMITOMO METAL IND
发明人： TAGO YUKARI , HIGUCHI YOSHIHIKO
IPC分类号： C21C5/32 , C21C5/46 , C21C7/072
摘要： PROBLEM TO BE SOLVED: To efficiently restrain the spitting without lowering the oxygen efficiency in decarburization and to improve the yield by alternately arranging two kinds of Laval nozzles having different inclining angles in a circumferential direction in a top-blown lance and specifying the ratio of both nozzle diameters. SOLUTION: In the top-blown lance for refining by blowing the refining gas onto molten metal, a plurality of Laval nozzles are arranged to improve the oxygen efficiency in the decarburization. At this time, in the nozzles 1, two kinds of nozzles 2-1, 2-2 having different inclining angles θ1 , θ2 , e.g. θ1 =α>1.0, desirably about 1.8>=α>=1.2. In this way, the pitting caused by the jet from the nozzle 2-1 is reduced and the pitting caused by the jet from the nozzle 2-2 is increased, and the pitting in the vertical direction is reduced to reduce the loss of molten metal.

34. 发明专利

JP2885620B2 失效
公开(公告)号：JP2885620B2
公开(公告)日：1999-04-26
申请号：JP26374693
申请日：1993-10-21
申请人： SHINNIPPON SEITETSU KK
发明人： FURUKAWA MIKITO , KUMAKURA MASANORI , IDE KAZUO , YONEZAWA KIMITOSHI , HORII KAZUHIRO
IPC分类号： C21C5/32 , C21C5/28 , C21C5/30 , G01N21/71

35. 发明专利

JPH11503200A 失效
公开(公告)号：JPH11503200A
公开(公告)日：1999-03-23
申请号：JP52979496
申请日：1996-04-04
IPC分类号： C21C5/32 , C21B11/00 , C21B13/00 , C21C5/28 , C21C7/00 , F27B3/22 , F27D3/18

36. 发明专利

JPH1030110A METHOD FOR BLOWING OXYGEN IN TOP-BOTTOM COMBINATION-BLOWN CONVERTER 失效
公开(公告)号：JPH1030110A
公开(公告)日：1998-02-03
申请号：JP20646996
申请日：1996-07-18
申请人： NIPPON STEEL CORP
发明人： KITAMURA SHINYA , NAITO KENICHIRO
IPC分类号： C21C5/32
摘要： PROBLEM TO BE SOLVED: To provide an oxygen blowing method of a top-bottom combination- blown converter which can make free from a trouble according to the lowering of decarburized oxygen efficiency by satisfying both of the restraint to the lowering of yield caused by the development of dust in the high carbon range and the restraint to the lowering of yield caused by the oxidation of iron in the low carbon range. SOLUTION: As for a throat diameter (d) of the top-bottom combination-blow lance nozzle and a suitable expansion outlet diameter D decided with oxygen supplying speed F, a top-blown lance having 0.85D-0.94D outlet diameter is used in the high carbon concn. range and a top-blown lance having 0.96D-1.15D outlet diameter is used in the low carbon concn. range.

37. 发明专利

JPH1030108A DECARBURIZING METHOD IN TOP-BOTTOM COMBINATION-BLOWN CONVERTER 失效
公开(公告)号：JPH1030108A
公开(公告)日：1998-02-03
申请号：JP20646696
申请日：1996-07-18
申请人： NIPPON STEEL CORP
发明人： KITAMURA SHINYA , NAITO KENICHIRO
IPC分类号： C21C5/32
摘要： PROBLEM TO BE SOLVED: To provide an oxygen-blowing method which can satisfy both of the restraint of lowering of the yield caused by a top-blown lance and the restraint of lowering of the yield caused by oxidation of iron, in a decarburizing method of molten steel with a top-bottom combination-blown converter. SOLUTION: This decarburizing method in the top-bottom combination-blown converter is so executed that as for the ratio P/PO of a designed secondary pressure PO of the top-blown lance nozzle and an operational secondary pressure P, at the time of making the P/PO to 1.2-1.7 in the high carbon concn. range, the P/PO is regulated to >=1.8 in the low carbon concn. range, or at the time of making the P/Po to 0.5-0.8 in the high carbon concn. range, the P/Po is regulated to 0.9-1.1 in the low carbon concn. range.

38. 发明专利

JPH09157725A METHOD FOR MELTING FERROUS SCRAP 失效
公开(公告)号：JPH09157725A
公开(公告)日：1997-06-17
申请号：JP2831296
申请日：1996-02-15
申请人： NIPPON STEEL CORP
发明人： KITAMURA SHINYA , OGAWA YUJI , NAITO KENICHIRO
IPC分类号： C21C5/28 , C21B11/00 , C21C5/32 , C21C5/46
摘要： PROBLEM TO BE SOLVED: To provide a scrap melting method having low wearing speed of refractory-made furnace wall by using a metallurgical furnace of a top and bottom combination-blown converter, etc. SOLUTION: At the time of melting ferrous scrap by using the metallurgical furnace of the top and bottom combination-blown converter, etc., and utilizing the heat generated by combustion of carbonaceous material together with oxygen-containing gas, a top gas blown lance 1 having a lance hole group A3 having 1-4 holes in the range of 0-12 deg. jetting angle θ for each hole and a lance hole group B2 having 3-6 holes in the range of 15-20 deg. jetting angle βfor each hole and arranged so as to surround the lance hole group A3, is used. At the scrap melting stage, flowing speed reaching a bath surface of the oxygen-containing gas jetted from the lance hole group A3 is made to be 5-20m/s and that from the lance hole group B2 is made to be 20-80m/s. At the slag spattering stage, flowing speed reaching the bath surface of gas of nitrogen, etc., jetted from the lance hole group A3 is made to be 50-300m/s and that from the lance hole group B2 is made to be 5-20m/s.

39. 发明专利

JPH0959709A METHOD FOR DEPHOSPHORIZING MOLTEN IRON 失效
公开(公告)号：JPH0959709A
公开(公告)日：1997-03-04
申请号：JP21686595
申请日：1995-08-25
申请人： SUMITOMO METAL IND
发明人： MIYATA MASAKI , FUKAGAWA MAKOTO
IPC分类号： C21C5/32 , C21C1/02
摘要： PROBLEM TO BE SOLVED: To obtain a dephosphorizing method of molten iron. SOLUTION: In a top/bottom blowing converter type furnace, at the time of executing the dephosphorizing treatment by using dephosphorizing consisting essentially of converter slag and iron oxide and top-blowing oxygen, the slag condition during treatment is controlled to 1.2-2.0 of basicity (%CaO/%SiO2 ), 2-15% (Al2 O3 ), 7-15% (T.Fe) and 5-15% (MnO). By this method, the cheap flux of low CaO/SiO2 is used to enable the dephosphosizing treatment without adding fluorite (CaF2 ) as the flux for dephosphorization, and the lowering of the cost in low phosphorus steel melting dephosphori-zing treatment, the slag can effectively by utillized to a subface course material, etc., without executing aging treatment.

40. 发明专利

JPH08269525A METHOD FOR CONTROLLING HEIGHT OF LANCE IN CONVERTER 失效
公开(公告)号：JPH08269525A
公开(公告)日：1996-10-15
申请号：JP7637095
申请日：1995-03-31
申请人： SUMITOMO METAL IND
发明人： HIRAYAMA NORIO
IPC分类号： C21C5/32
摘要： PURPOSE: To provide a method for controlling the height of a lance in a converter, by which slopping and spitting are restrained and also, the decarburizing oxygen efficiency and the heat supplying ratio are kept to in a good condition. CONSTITUTION: A basic pattern K(i) of L/L0 and an oxygen flow rate pattern F02 (i) are selected from the operational condition related to blowing, and based on the operational actual result in the previous heat, whether the corrections of the L/L0 pattern and a lance height pattern are to be executed or not, is judged. At the time of judging to execute the correction, the necessary block K(i) is corrected and the height of the lance 3 are corrected. Then, a control pattern LL(i) of the lance 3 height is calculated based on the obtd. value of the molten metal surface height LB, nozzle specification of the lance 3 contained in the operational condition and the corrected K(i) an oxygen flow rate pattern F02 (i). Further, whether the calculated control pattern LL(i) is to correct or not, is judged based on the operational actual result in the converter, and in the case of needing the correction, the control pattern LL(i) is corrected as the same way as the above based on the operational actual result.

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