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1. 发明专利

JPH0883682A ARC FURNACE FACILITY 失效
公开(公告)号：JPH0883682A
公开(公告)日：1996-03-26
申请号：JP24088494
申请日：1994-09-09
申请人： NIPPON STEEL CORP
发明人： TAKAHASHI MAKOTO , HIDAKA HIROMOTO
IPC分类号： H05B7/10 , C21C5/52 , F27B3/20 , F27D11/08 , F27D11/10
摘要： PURPOSE: To prevent electrode fracture even at a large furnace body tilt angle by providing an electrode intermediate section holding device for the intermediate portion of an upper electrode lifted to a position above a furnace cover. CONSTITUTION: In the case of a 28" graphite electrode, a movable electrode 7, when sized to have approximately 2.8m length, comes to have three nipple connecting sections for jointing graphite electrodes to each other at a position under an electrode holding device 8. Also, the electrode 7 projects down approximately seven meters from the device 8. Thus, when a furnace is largely tilted in this state, the electrode 7 is broken at the connecting section of the graphite electrodes nearest the device 8, due to bending moment resulting from the own weight thereof. In order to solve such a problem, an electrode intermediate section holding device 9 to hold the intermediate portion of the electrode 7 is provided above a furnace cover. As a result, two units can be operated without any increase in an electrode unit requirement, and an electricity unit requirement can be reduced, due to energy saving.

2. 发明专利

JPH04354816A STRUCTURE FOR SETTING TUYERE IN ELECTRIC FURNACE 失效
公开(公告)号：JPH04354816A
公开(公告)日：1992-12-09
申请号：JP15224591
申请日：1991-05-29
申请人： NIPPON STEEL CORP
发明人： TAKAHASHI MAKOTO , HIDAKA HIROMOTO
IPC分类号： C21C5/52
摘要： PURPOSE:To execute gas blowing capable of uniformizing a bath in an electric furnace and giving extensive stirring, to maderate a blow-through phenomenon of a molten metal with the gas blowing, to enable a large quantity of blowing from tuyeres at furnace bottom and side wall, to improve metallurgical reactions and to uniformize the temp. and the components. CONSTITUTION:In the electric furnace, the blowing tuyere 5 at upper part of the furnace bottom part and the blowing tuyere 4 at horizontal direction to the furnace wall part dipped in the molten metal and inclined in the direction cancelling circular flow of the molten metal to the furnace center, are arranged. By this method, an extremely large quantity of gas and powder blowing operation can be executed, and the yield can be improved and the energy can be reduced.

3. 发明专利

JPH10300353A SCRAP PREHEATING METHOD AND APPARATUS IN TWIN-TYPE ELECTRIC FURNACE 失效
公开(公告)号：JPH10300353A
公开(公告)日：1998-11-13
申请号：JP10978897
申请日：1997-04-25
申请人： NIPPON STEEL CORP
发明人： HIDAKA HIROMOTO
IPC分类号： C21C5/52 , F27B3/08 , F27D17/00
摘要： PROBLEM TO BE SOLVED: To minimize an electric energy necessary to melt and smelt scraps by enabling a complete combustion of CO gas by reacting the CO gas with oxygen in an amount corresponding to the CO concentration just prior to introducing an exhaust gas into an electric furnace which is being preheated and introducing such an exhaust gas thereafter. SOLUTION: With a CO concentration detector 12 disposed in a combustion chamber 8 mounted on a furnace lid 4 which is installed at a furnace A where melting is proceeding, the CO concentration in an exhaust gas discharged from the furnace A is measured. In response to this CO concentration, oxygen or oxygen containing gas in an amount necessary to realize a complete combustion of this CO gas is blown into an oxygen blow-off device 9. With such a provision, in a combustion chamber 8 which is disposed above a furnace lid 4 of a furnace B, the CO gas in the exhaust gas discharged from the furnace A is subjected to the complete combustion. Since the combustion heat is generated in the combustion chamber 8 just prior to the introduction of the exhaust gas into the furnace B, scrap can be preheated from the upper portion of the furnace B.

4. 发明专利

JPH06192718A METHOD FOR BLOWING IN OXYGEN OR OXYGEN-CONTAINING GAS WITHOUT WEARING LANCE 失效
公开(公告)号：JPH06192718A
公开(公告)日：1994-07-12
申请号：JP35736392
申请日：1992-12-24
申请人： NIPPON STEEL CORP
发明人： TAKAHASHI MAKOTO , MAKINOSUMI SHINAN , HORA SHIRO , HIDAKA HIROMOTO
IPC分类号： C21C5/32 , C21C5/46 , C21C5/52 , C22B9/04 , F27D3/16
摘要： PURPOSE:To improve the utilizing efficiency of oxygen-containing gas, to suppress the spattering of molten metal and slag and to prevent the wearing of the lance by regulating blowing direction and blowing velocity, etc., of the lance for oxygen-containing gas from the upper part. CONSTITUTION:In a DC electric furnace 1 arranged with an upper electrode 6 and a furnace bottom electrode 7 in the furnace body 4, the lance 10 for blowing in oxygen and a lance 11 for blowing in powdery material are inserted from an operating hole 9, and by blowing in the oxygen or the oxygen- containing gas and the powdery material for refining into the molten metal 8 from the upper part, the refining is executed. Then, the height (h) from the surface of the molten metal 8 to the blowing out position of the lance 10 for blowing in oxygen is set at 300-700mm and the angle theta in the blowing out direction is made >=30 deg.. Further, the ratio L/H of L by equation VaXd=0.73X (L/sintheta ) X(h+L/ sin theta ) (wherein, Va: gas flowing velocity Nm/sec, d: throat diameter of a widened end nozzle mm, L: recessed depth of the molten metal by blowing in mm) the ratio of the L and depth H of the molten metal 8 is made 0.4-0.7.

5. 发明专利

JPH0611276A METHOD FOR CONTROLLING ARC OF DC ARC FURNACE OF SUCCESSIVE SCRAP CHARGING TYPE 失效
公开(公告)号：JPH0611276A
公开(公告)日：1994-01-21
申请号：JP17096992
申请日：1992-06-29
申请人： NIPPON STEEL CORP
发明人： HIDAKA HIROMOTO
IPC分类号： F27D11/08 , F27D11/10 , F27D19/00 , H05B7/20
摘要： PURPOSE:To increase melting rate and the constraint limit of scrap charging speed by a method wherein an arc is deflected against scrap charging position when the scraps are being successively charged, the arc deflecting amount is switched to the conducting route having a ratio of arc deflecting amount to interior furnace radius of at least a predetermined value according to the scrap charging speed and to the conducting route having the ratio of at most the predetermined value when molten metal is heated. CONSTITUTION:The circumferential uniformity of a thermal loading on the wall of a furnace is changed according to the relationship between a portion impinging against molten metal of a heated air column having an inclination angle, an amount offset from the furnace center, i.e. an arc deflecting amount L, and an interior furnace radius R. The greater the ratio of L to R, i.e., the arc deflecting amount L is, the larger the thermal loading on the furnace wall in the arc deflecting direction becomes, even in the same arc heating conditions. When the scraps are being successively charged, the arc deflecting amount is switched to the conducting route having a ratio of L to R of at least 0.05 and, when the scrap charge is stopped and molten metal is heated, the arc deflecting amount is switched to the conducting route having a ratio of L to R of at most 0.05. In this way the thermal loading on the furnace wall becomes uniform, thereby suppressing the wear of refractory material 2 on the furnace wall.

6. 发明专利

JPH09210561A FURNACE STRUCTURE IN TWIN TYPE ELECTRICAL FURNACE 失效
公开(公告)号：JPH09210561A
公开(公告)日：1997-08-12
申请号：JP1601796
申请日：1996-01-31
申请人： NIPPON STEEL CORP
发明人： HIDAKA HIROMOTO
IPC分类号： F27B3/04 , F27B14/06
摘要： PROBLEM TO BE SOLVED: To provide a minimum electrical power energy required for melting and refining scrap by a method wherein oxygen for use in igniting CO in a preheating furnace is supplied on the basis of a detected value of CO concentration in discharged gas discharged from above a surface where a moving furnace body is installed. SOLUTION: A furnace lid 4 is installed at the upper part of a furnace A, and a movable moving furnace body 8 is arranged between a furnace main body 1 and the furnace lid 4 and then arc is generated between a furnace bottom electrode 5 placed at the bottom part of the furnace and a movable electrode 6 at the upper part of the furnace. Then, at a furnace B, molten steel 7 is partially left and scrap 11 to be melted is filled in the furnace in advance, hot discharged gas discharged from the furnace A is fed to the furnace B through a duct 10 so as to heat the scrap in advance. An oxygen blowing-in device 9 is mounted at the moving furnace body 8, either oxygen or gas containing oxygen is blown into the furnace to react with CO gas in a pre-heating furnace. As a blowing-in amount of oxygen, a CO concentration in the discharged gas discharged from the preheating furnace B is measured by a device 14 and then an amount of oxygen required for performing a complete combustion of CO gas is blown into the furnace.

7. 发明专利

JPH04346612A STRUCTURE OF ELECTRIC FURNACE AND ITS OPERATION 失效
公开(公告)号：JPH04346612A
公开(公告)日：1992-12-02
申请号：JP14408791
申请日：1991-05-21
申请人： NIPPON STEEL CORP
发明人： TAKAHASHI MAKOTO , HIDAKA HIROMOTO
IPC分类号： C21C5/52 , F27B3/08 , F27B3/22
摘要： PURPOSE:To uniformize the bath in an electric furnace, to relieve the blow-by of molten metal due to the gas blowing nozzle causing large agitation and gas blowing, to blow a large amt. of gas, to promote the melting of solid charge materials, to improve the metallurgical reaction, to uniformize the temp. and composition and to reduce the wear of the hearth refractory by the gas, powder and violent movement of molten metal. CONSTITUTION:In an electric furnace, a tuyere 4 for blowing a gas 6 and a powder 5 is set almost horizontally at the upper surface of the residual molten metal 10 with the depth of the bath from the bottom 9 controlled to >=300mm, the residual molten metal 10 is left to the level of the tuyere provided on the side wall of the furnace body 1, the gas and powder can be blown from the start of operation, and the electric furnace is operated. Consequently, the blowing by a lance from the top and machines are not needed, the equipment cost is reduced, the blow-by of the gas blown from the conventional tuyere is eliminated, the gas and powder are continuously blown into the molten metal, and the utilization factor of the gas and powder is extremely high.

8. 发明专利

JPH04254185A SLAG-METAL CUTTING DEVICE FOR DC ELECTRIC FURNACE 失效
公开(公告)号：JPH04254185A
公开(公告)日：1992-09-09
申请号：JP1346491
申请日：1991-02-04
申请人： NIPPON STEEL CORP
发明人： TAKAHASHI MAKOTO , MORI KIYOSUKE , HIDAKA HIROMOTO
IPC分类号： F27B3/08 , F27D11/10
摘要： PURPOSE:To contrive the improvement of the efficiency of cutting and removing works of slag.metal as well as the energy saving of the works under poor working circumstance by a method wherein the title device is provided with an elevating device for elevating blow pipes to a given height from the upper surface of the slag.metal. CONSTITUTION:Slug metal 2 containing a plenty of oxides remains in a furnace and adheres to a hearth electrode unit whereby a hearth electrode 1 is connected to refractories 6 around the hearth electrode. The hearth electrode 1 is taken out of the upper part of a furnace body and, therefore, it is necessary to cut the connection between the hearth electrode 1 and the refractories. A slag.metal cutting device 3 is installed on the furnace body 4 of the electric furnace and an elevating device 9, arranged with blow pipes 5 in the furnace body 4 of the electric furnace, is employed to move the blow pipe 5 to a requested height from the upper surface of the slag.metal 2 employing the elevating device 9 arranged on the furnace. The setting of the height is effected visually or utilizing a television camera while confirming the upper surface of the slag.metal 2. The blow pipes are turned by a turning device 10 to fuse and cut the slag.metal 2 circumferentially.

9. 发明专利

JP2001241860A METHOD FOR PREHEATING SCRAP 失效
公开(公告)号：JP2001241860A
公开(公告)日：2001-09-07
申请号：JP2000049893
申请日：2000-02-25
申请人： NIPPON STEEL CORP
发明人： UCHIDA SHINJIRO , SOMA NAOHITO , HIDAKA HIROMOTO
IPC分类号： F27D13/00
摘要： PROBLEM TO BE SOLVED: To prolong a time in which combustion heat of an auxiliary fuel put into a preheating tank of scrap is utilized for preheating the scrap and increase a gain of a preheating effect. SOLUTION: Exhaust gas discharged from a melting furnace of raw materials including scrap or the like is introduced into the preheating tank filled with the raw materials and waste plastics of the auxiliary fuel. An exhaust gas temperature is measured at proximity to the waste plastics. When the exhaust gas temperature is below an ignition temperature of the waste plastics, a burner provided on a side of an inlet for introducing gas in the preheating tank is operated to ignite and preheat the waste plastics.

10. 发明专利

JPH11294959A WATERCOOL LANCE DEVICE WITH BURNER FUNCTION 失效
公开(公告)号：JPH11294959A
公开(公告)日：1999-10-29
申请号：JP10124898
申请日：1998-04-13
申请人： NIPPON STEEL CORP , NITTETSU PLANT DESIGNING CORP
发明人： UCHIDA SHINJIRO , ARIMITSU ISAO , HIDAKA HIROMOTO
IPC分类号： C21C7/072 , C21C5/52 , F27B3/08 , F27B3/22
摘要： PROBLEM TO BE SOLVED: To heat a wide range of metal materials, by incorporating a channel that blows oxygen from the tip of a lance slantingly downward at speed being equal to the speed of sound or more, and a channel that blows oxygen from the tip of the lance forward for mixing with fuel into one non-wear-type lance body. SOLUTION: A channel 6 that supplies oxygen and blows the oxygen from a tip opening 2 of a lance slantingly downward at speed being equal to the speed of sound or more is provided at the center of one non-wear-type lance body 1. Also, a channel 8 that supplies fuel such as LPG being arranged concentrically and blows the fuel from a tip opening of the lance forward, and channel 9 that supplies the oxygen for fuel combustion and blows the oxygen from a tip opening 5 of the lance forward for mixing are provided at the left and right sides of the channel 6, thus easily heating a wide range of metal materials without interfering with work near a working port.

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