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1. 发明专利

JPH0256588B2 失效
公开(公告)号：JPH0256588B2
公开(公告)日：1990-11-30
申请号：JP2549286
申请日：1986-02-07
申请人： NIPPON STEEL CORP
发明人： SEKI MASAHIKO , NAKATANI HIROSHI , OGUMAZAKA KATSUYA , TAKAO MASAO
IPC分类号： F27D13/00 , F27B3/10

2. 发明专利

JPS63183116A METHOD FOR OPERATING ARC FURNACE AND ARC FURNACE 失效
公开(公告)号：JPS63183116A
公开(公告)日：1988-07-28
申请号：JP1689987
申请日：1987-01-26
申请人： NIPPON STEEL CORP
发明人： SEKI MASAHIKO
IPC分类号： C21C5/52 , F27B3/08
摘要： PURPOSE:To clean steel and to extend the life of furnace wall refractories by charging a desulfurizing material into the furnace and blowing a stirring gas from bottom blowing nozzles therein to desulfurize the steel in the stage before tapping, then tapping the molten steel while the molten steel contg. slag is made to remain in the furnace. CONSTITUTION:The raw materials charged into the furnace body is heated and melted by the arcs generated by electrodes 4 and the bottom blowing nozzles 6, 7 are disposed to the furnace bottom to stir and refine the molten steel. The hearth 5 of the arc furnace constituted in the above-mentioned manner is formed to a recessed shape which is deepest in nearly the central area. A tap hole 9 provided with a stopper 10 is provided at such a height of the aperture at which the nozzles 6, 7 are held immersed at all times in the steel bath. The desulfurizing material is previously charged into the furnace and the stirring gas is blown from the nozzles 6, 7 into the molten steel to desulfurize the steel in the stage before tapping with the above- mentioned arc furnace. The molten steel is then tapped while part of the molten steel contg. the slag is made to remain in the furnace. The amt. of the remaining steel is confined to about >=1/10 the initial volume of the molten steel. The bottom blowing nozzles 6, 7 are preferably held surely immersed at all times into the remaining molten steel to prevent the damage thereof.

3. 发明专利

JPS63183115A METHOD FOR STIRRING MOLTEN METAL BATH OF ARC FURNACE 失效
公开(公告)号：JPS63183115A
公开(公告)日：1988-07-28
申请号：JP1689887
申请日：1987-01-26
申请人： NIPPON STEEL CORP
发明人： SEKI MASAHIKO , ANABUKI YUKITAKA
IPC分类号： C21C5/52
摘要： PURPOSE:To apply large stirring capacity to a molten metal bath and to accelerate melting and refining of metal by blowing an adequate volume of a stirring gas from plural nozzles disposed in a specific range of a furnace bottom part and interfering the waving of the molten metal bath with each other. CONSTITUTION:Scrap, ore raw material, alloy material, etc., are charged into a furnace body 1 consisting of a furnace wall 2 provided with water-cooling panels 3 and a hearth 7 and are melted and refined by the arcs generated by electrodes 6. >=3 Pieces of the nozzles 8... are disposed to the furnace bottom within a 0.3-0.8XD range when the inside diameter of the shell of the body 1 of the arc furnace constituted in the above-mentioned manner is designated as D. The stirring gas is blown from the nozzles 8... at the total flow rate of >=0.3Nm /ton.hr per ton of the molten metal. The waving of the molten metal bath generated by the blowing of the gas in the above-mentioned constitution is accelerated by the interference between the nozzles. The molten metal bath is thereby effectively stirred to accelerate the melting of the solid charge and to uniformize metallurgical reaction, bath temp. and components.

4. 发明专利

JPS63125610A METHOD FOR CONTROLLING AUTOMATIC BOTTOM BLOWING WITH ELECTRIC ARC FURNACE 失效
公开(公告)号：JPS63125610A
公开(公告)日：1988-05-28
申请号：JP27158586
申请日：1986-11-13
申请人： NIPPON STEEL CORP , GODO SEITETSU
发明人： SEKI MASAHIKO , ANABUKI YUKITAKA , SHIMA GIZABURO
IPC分类号： C21C5/52
摘要： PURPOSE:To stably melt and refine a molten metal without causing inadvertent leakage of the molten metal, slag, etc., by detecting the flow rate and pressure of a gas for bottom blowing and stirring to recognize the oscillation condition of a bath and controlling the supply flow rate of the gas in accordance with such condition. CONSTITUTION:Pressure detecting ends 5a, 5b are disposed in the upper stream near bottom blowing nozzles 2a, 2b for the stirring gas of the electric arc furnace 1 to approximately detect the pressure in the furnace 1. The flow rate of the gas is simultaneously detected by flow meters 7a, 7b. The increase of the oscillations generated in the in-furnace bath to the permissible limit is judged when the fluctuations in the flow rate and blowing pressure thereof increase up to a discrimination level or above. The opening degrees of flow rate control valves 6a, 6b are then regulated to decrease or increase the supply rate of the gas. As a result, the bath is stabilized and the optimum stirring is executed.

5. 发明专利

JPS63121611A METHOD AND DEVICE FOR STIRRING MOLTEN METAL BATH FOR ELECTRIC ARC FURNACE 失效
公开(公告)号：JPS63121611A
公开(公告)日：1988-05-25
申请号：JP26628886
申请日：1986-11-08
申请人： NIPPON STEEL CORP , GODO SEITETSU
发明人： SEKI MASAHIKO , ANABUKI YUKITAKA , KUBOTA TATSUYUKI
IPC分类号： C21C5/52 , F27B3/22 , F27D27/00
摘要： PURPOSE:To suppress waving, turning and oscillating movements of the molten metal in a furnace and to thoroughly stir the molten metal by specifying the blowing rates of gases from central nozzles provided in the central part of the furnace bottom and precribed peripheral nozzles to prescribed flow rate ratios. CONSTITUTION:>=1 pieces of the peripheral nozzles 7 are provided to the furnace floor part 5 in a 0.2-0.8XR radius range (where R: inside radius of the shell 1a of a furnace body 1). >=1 pieces of the central nozzles 6 are provided to the central part of the furnace body 1. The ratio of the total flow rate Q1 of the gas for stirring or in common use for transporting the powder and for stirring to be blown from the central nozzles 6 and the total flow rate Q2 of the gas to be blown from the above-mentioned peripheral nozzles 7 is specified to 0.5-5 Q1/Q2.

6. 发明专利

JPS61295491A METHOD OF CONTROLLING CIRCULATION OF EXHAUST GAS FROM RAW MATERIAL PREHEATER 失效
公开(公告)号：JPS61295491A
公开(公告)日：1986-12-26
申请号：JP13762785
申请日：1985-06-24
申请人： NIPPON STEEL CORP
发明人： SEKI MASAHIKO , ARIMITSU ISAO , FUJIMORI TOSHINORI
IPC分类号： F27D13/00

7. 发明专利

JPS6115080A Scrap preheating method by exhaust gas 失效
标题翻译：废气排放预热方法
公开(公告)号：JPS6115080A
公开(公告)日：1986-01-23
申请号：JP13289584
申请日：1984-06-29
申请人： Nippon Steel Corp
发明人： SEKI MASAHIKO , TAKEDA MASAFUMI , YUDA KOUICHI
IPC分类号： C21C5/52 , C22B1/00 , F27D13/00 , F27D17/00
CPC分类号： Y02P10/216

8. 发明专利

JPS60126578A ARC FURNACE 失效
公开(公告)号：JPS60126578A
公开(公告)日：1985-07-06
申请号：JP23431583
申请日：1983-12-14
申请人： NIPPON STEEL CORP
发明人： SEKI MASAHIKO , MORI KIYOSUKE
IPC分类号： C21C5/52 , F27B3/08 , F27D3/14

9. 发明专利

JPS6057187A MOLTEN METAL INDUCTION HEATER 失效
公开(公告)号：JPS6057187A
公开(公告)日：1985-04-02
申请号：JP16615383
申请日：1983-09-09
申请人： NIPPON STEEL CORP
发明人： KOMADA TADAYUKI , SEKI MASAHIKO , ISHITA YOSHIYUKI
IPC分类号： F27D11/06 , F27B14/06 , H05B6/24 , H05B6/26

10. 发明专利

JPS5940490A Electrode supporting structure in electric furnace 失效
公开(公告)号：JPS5940490A
公开(公告)日：1984-03-06
申请号：JP14857882
申请日：1982-08-27
申请人： Nippon Steel Corp
发明人： SEKI MASAHIKO
IPC分类号： H05B7/103

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