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1. 发明专利

JP2004037163A Temperature measuring apparatus in molten metal 审中-公开
公开(公告)号：JP2004037163A
公开(公告)日：2004-02-05
申请号：JP2002192319
申请日：2002-07-01
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： YAMASHITA KOSUKE , TANAKA TOMOAKI , SUGIURA MASAHITO , HORIKOSHI KIYOMI
IPC分类号： G01J5/02 , G01J5/00 , G01J5/08 , G01J5/10 , G01J5/48
摘要： PROBLEM TO BE SOLVED: To perform appropriate operation and facility control by constantly and accurately grasping the temperature of molten steel.
SOLUTION: A temperature measuring apparatus in molten metal comprises a nozzle 3 for measuring temperature being provided through the wall of a container for accommodating a molten metal 1; an apparatus for supplying an inert gas under pressure for preventing the intrusion of the molten metal into the nozzle; an apparatus for capturing the heat radiation light of the molten metal facing the tip section of the nozzle into an imaging device via an image fiber 4; an image inputting apparatus 12 for converting an image signal outputted by the imaging device to digital image data; and a data processing apparatus for calculating the temperature of the molten steel on a photograph screen in the imaging apparatus based on the digital image data. The temperature measuring apparatus has a function for calculating the area of a high-brightness region due to thermal radiation light on an imaging screen and a function for blowing an oxygen gas 8 to a nozzle tip section that faces the molten metal from the inside of the nozzle.
COPYRIGHT: (C)2004,JPO

2. 发明专利

JP2003105428A METHOD FOR REMOVING METAL DEPOSITED ON TIP OF TUYERE, AND METHOD FOR MEASURING TEMPERATURE OF MOLTEN METAL 有权
公开(公告)号：JP2003105428A
公开(公告)日：2003-04-09
申请号：JP2002212967
申请日：2002-07-22
申请人： NIPPON STEEL CORP , NITTETSU PLANT DESIGNING CORP
发明人： YAMASHITA KOSUKE , TANAKA TOMOAKI , SUMI MAKOTO
IPC分类号： B22D1/00 , B22D2/00 , C21C5/46 , C21C5/48 , C21C7/00 , C21C7/072 , F27D21/00 , F27D25/00 , F27D23/02
摘要： PROBLEM TO BE SOLVED: To provide a method for melting and removing a metal deposited on a tip of a tuyere of a double or triple pipe structure used to blow a process gas or a purge gas for measuring the temperature of molten metal in a refining furnace. SOLUTION: In the method for removing the metal deposited on the tip of the tuyere of the double or triple pipe structure dipped in the molten metal in the refining furnace, the refining furnace under the operation is empty, and in the case of the tuyere of double pipe structure, a hydrocarbon gas, a liquid fuel or a combustible gas is singly run, or at least two of them are mixed and run in a flow passage in a space between outer and inner pipes, and a gas containing oxygen in which gaseous oxygen is regulated in a combustible concentration range is run in the inner pipe of the tuyere. In the case of the tuyere of the triple pipe structure, the hydrocarbon gas, the liquid fuel or the combustible gas is singly run, or at least two of them are mixed and run in a flow passage in a space between the outermost pipe and a middle pipe, and the gas containing oxygen in which gaseous oxygen is regulated in the combustible concentration range is run in a flow passage in a space between the middle pipe and the innermost pipe of the tuyere. The metal deposited on the tip of the tuyere is melted and removed.

3. 发明专利

JP2003041317A Device and method for sealing hole for charging alloy and auxiliary material in vacuum refining furnace 有权
标题翻译：用于在真空精炼炉中充填合金和辅助材料的孔密封的装置和方法
公开(公告)号：JP2003041317A
公开(公告)日：2003-02-13
申请号：JP2001228143
申请日：2001-07-27
申请人： Nippon Steel Corp , Nittetsu Plant Designing Corp , 新日本製鐵株式会社 , 日鐵プラント設計株式会社
发明人： YAMASHITA KOSUKE , TANAKA TOMOAKI , SUMI MAKOTO
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a sealing device which can prevent a blockage in a hole for charging an alloy and an auxiliary material, even under a refining condition with severe upward spouting of iron and splash, and provide a sealing method.
SOLUTION: The sealing device for sealing the hole 12 for charging the alloy and the auxiliary material into the vacuum refining furnace, which is arranged on the top of the vacuum refining furnace 1, is characterized by arranging a pseud-lance 5 integrated with a valve disc into a monolithic structure, below a lower part seal valve 6 for sealing the hole for charging the alloy and the auxiliary material; further installing a seal hole 9 for spraying a seal gas on the pseud-lance, in an inner wall of the hole for charging the alloy and the auxiliary material, as required; and connecting both the lower part seal valve and the pseud-lance to elevators which are installed in both sides of a chute for charging the alloy and the auxiliary material.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：提供一种能够防止在用于充填合金和辅助材料的孔中堵塞的密封装置，即使在严重向上喷射铁和飞溅的精炼条件下，也提供密封方法。解决方案：将用于将合金和辅助材料充入孔12的密封装置设置在真空精炼炉1的顶部的真空精炼炉中，其特征在于布置与阀一体化的假针5 在下部密封阀6下方密封用于对合金和辅助材料充电的孔; 进一步安装密封孔9，用于根据需要在密封孔的内壁上喷涂密封气体，用于填充合金和辅助材料的孔; 并将下部密封阀和假枪连接到安装在用于对合金和辅助材料充电的滑槽两侧的电梯。

4. 发明专利

JP2001323315A METHOD FOR DECARBURIZING-REFINING CHROMIUM CONTAINED MOLTEN STEEL 失效
公开(公告)号：JP2001323315A
公开(公告)日：2001-11-22
申请号：JP2000142189
申请日：2000-05-15
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , TANAKA TOMOAKI , KINOSHITA YOSUKE , NAGATA SEIJI
IPC分类号： C21C7/068 , C21C7/00 , C21C7/072
摘要： PROBLEM TO BE SOLVED: To efficiently perform the decarburization by reducing oxidizing loss of chromium in the decarburizing-refining of a chromium contained steel. SOLUTION: Molten steel temperature is continuously measured from the stating time of the decarburization and oxygen efficiency for decarburizing is continuously obtained from the measured molten steel temperature to perform the refining according to the oxygen efficiency for decarburizing. Further, the control of refining condition is performed so that ΔT in the following equation becomes >=30 deg.C. ΔT=(T+273.15)-(-13800/(-8.765 log ([%C] PCO/[%Cr]))). Wherein, T is the measured molten steel temperature, [%C] is [C] concentration (mass %) in the molten steel before measuring the temperature, PCO is partial pressure (atm) of CO gas in the atmosphere and [%Cr] is [Cr] concentration (mass %) in the molten steel before measuring the temperature.

5. 发明专利

JP2004190100A Aod furnace and its operating method 审中-公开
标题翻译： AOD FURNACE及其操作方法
公开(公告)号：JP2004190100A
公开(公告)日：2004-07-08
申请号：JP2002360565
申请日：2002-12-12
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： IMOTO TAKEO , FUKUMURA HIROAKI , TANAKA TOMOAKI
IPC分类号： C21C7/072 , C21C7/00 , C21C7/068
摘要： PROBLEM TO BE SOLVED: To efficiently prolong the service life of a tuyere in an AOD (argon oxygen decarburization) furnace while holding gas cost to a low level.
SOLUTION: In the initial stage of the service life in the furnace, the gas flowing speed of the outer pipe in both side tuyeres 4a is made to be ≥ 280 Nm/s and also, the gas flowing speed of the outer pipe in the inside tuyere 4b interposed with both side tuyeres, is made to be ≤ 150 Nm/s, and thus, damage given to both side tuyeres 4a with the flowing in the peripheral direction of molten steel, is restrained. In the end stage of the service life in the furnace, the gas flowing speed of the outer pipe in both side tuyeres 4a is made to be ≤ 150 Nm/s, and the gas flowing speed of the outer pipe in the inside tuyere 4b is made to be ≥ 280 Nm/s, and thus, the erosion caused by vertex is prevented.
COPYRIGHT: (C)2004,JPO&NCIPI
摘要翻译：要解决的问题：为了有效地延长AOD（氩氧脱碳）炉中的风口的使用寿命，同时将气体成本保持在低水平。解决方案：在炉的使用寿命的初始阶段，两侧风嘴4a内的外管的气体流动速度为280Nm / s，外管的气体流动速度在插入了两侧风嘴的内侧风口4b中，被限制为150Nm / s以下，从而抑制了沿着钢水的圆周方向流动的两侧风嘴4a的损伤。在炉的使用寿命的最后阶段，将两侧风嘴4a内的外管的气体流动速度设定为150Nm / s，将外管4b内的气体流速设为被制成≥280Nm/ s，从而防止由顶点引起的侵蚀。版权所有（C）2004，JPO＆NCIPI

6. 发明专利

JP2004076058A Method for ventilating gas in returned water storing vessel in evacuating apparatus and water-sealing cover for returned water storing vessel 有权
公开(公告)号：JP2004076058A
公开(公告)日：2004-03-11
申请号：JP2002235726
申请日：2002-08-13
申请人： Nippon Steel Corp , Nittetsu Plant Designing Corp , 新日本製鐵株式会社 , 日鐵プラント設計株式会社
发明人： YAMASHITA KOSUKE , TANAKA TOMOAKI , SUMI MAKOTO
IPC分类号： F24F7/06 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a method and equipment for preventing the leakage of CO-containing gas from a hot-well and a method and equipment for minimizing damage to the equipment occurring when cooling water overflows into the hot-well, for exhaust gas treatment equipment in a vacuum refining furnace.
SOLUTION: A method for ventilating gas in a returned water storing vessel in an evacuating apparatus, is characterized in that the evacuation is performed by using a suction means from an exhaust gas duct connected with the upper part of the returned water storing vessel for water for condensers etc., in a vacuum refining facility provided with the evacuating apparatus and the gas for ventilating is introduced into the returned water storing vessel from the suction duct of the gas for ventilating connected with the upper part of the returned water storing vessel. Further, a water-sealing cover for returned water storing vessel composed of a partition cover disposed without being fixed, is arranged at the upper part of the returned water storing vessel of the water for condensers etc., in the vacuum refining facility provided with the evacuating apparatus.
COPYRIGHT: (C)2004,JPO

7. 发明专利

JP2003096515A METHOD FOR REFINING MOLTEN EXTRA-LOW CARBON CHROMIUM- CONTAINING STEEL 审中-公开
公开(公告)号：JP2003096515A
公开(公告)日：2003-04-03
申请号：JP2001286695
申请日：2001-09-20
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , TANAKA TOMOAKI , IGARASHI MASAO , YOSHINO KOICHIRO
IPC分类号： C21C7/10 , C21C7/00
摘要： PROBLEM TO BE SOLVED: To provide a refining method with which refining cost is reduced by shortening the time needed to the refining in a decarburize-refining of an extra-low carbon chromium-containing steel. SOLUTION: In the method for refining the molten extra-low carbon chromium-containing steel performing the decarburize-refining by blowing gas containing oxygen gas into the molten chromium-containing steel under reduced pressure, or under the atmosphere pressure and under reduced pressure, after performing the reduced pressure refining at first time, the pressure in a vessel is returned back to >=400 Torr pressure and thereafter, the reduced pressure refining at second time is performed by making blowing speed of bottom-blown gas to >=0.4 Nm /min/ton of molten steel. [C] concentration in the molten steel after reduced pressure refining at the first time is made to

8. 发明专利

JP2002310573A APPARATUS AND METHOD FOR TREATING EXHAUST GAS 失效
公开(公告)号：JP2002310573A
公开(公告)日：2002-10-23
申请号：JP2001112202
申请日：2001-04-11
申请人： NIPPON STEEL CORP
发明人： YAMASHITA KOSUKE , TANAKA TOMOAKI
IPC分类号： B01D51/00 , F27D17/00 , F27D19/00
摘要： PROBLEM TO BE SOLVED: To execute a reduction in an energy/utility unit requirement due to shortening of a refining time, a decrease in an oxidation loss of a valuable element such as iron, chromium or the like, an improvement in a refractory life and an increase in a production efficiency or the like by lowering a pressure loss in an exhaust gas treating unit and maintaining a vacuum degree in a refining furnace at a high level in a process for vacuum-refining a molten metal. SOLUTION: A method for treating the exhaust gas comprises the steps of cooling the exhaust gas generated from a vacuum degassing unit of the molten metal by two or more stages of coolers, branching a bypass duct 7 from a duct 2 between the first and second stage coolers, and connecting the duct 7 to the rear side of the final stage cooler or the duct after a dust collector. In this case, the first stage cooler is preferably of a water tube type, and the second stage cooler is preferably of a smoke tube type.

9. 发明专利

JP2001083013A TEMPERATURE MEASURING DEVICE FOR MOLTEN METAL 失效
公开(公告)号：JP2001083013A
公开(公告)日：2001-03-30
申请号：JP25715499
申请日：1999-09-10
申请人： NIPPON STEEL CORP , NITTETSU PLANT DESIGNING CORP
发明人： TANAKA TOMOAKI , YUKI TOSHITAKA , SUMI MAKOTO
IPC分类号： G01J5/02 , G01J5/00
摘要： PROBLEM TO BE SOLVED: To easily and quickly perform maintenance, such as attaching/detaching of a fiber at furnace replacement and measurement of the erosion amount at a nozzle tip by preventing dislocation in optical axis, from the nozzle tip to a fiber tip as well as damage to the fiber, related to a method for measuring the temperature of a molten metal based on thermal radiation light of a molten steel, in a furnace through guiding via the nozzle provided on a furnace wall as well as the connected fiber. SOLUTION: A fitting part which encloses a nozzle part protruding from a refinery furnace is provided, and at a protrusion end of the nozzle, a purge gas guide part 7, a breakdown-strength window glass holding part 10, a fiber-centering part 14, and a fiber protective tube 20 are connected sequentially. A cooling gas path 13 is provided, which penetrates the fiber centering part 14 and the breakdown-strength window glass holding part 10 from inside the fiber protective tube 20 to communicate with the outside. A protruding conical part 16 of the fiber centering part 14 is contacted tightly to the protruding conical part of the breakdown-strength window glass holding part 10 to provide a recessed conical part 17 and an elastic holding member 18, which engages with the axial core part of the protruding conical part with a fiber element line 15 penetrated.

10. 发明专利

JP2001040408A METHOD FOR DESULFURIZING STAINLESS STEEL 失效
公开(公告)号：JP2001040408A
公开(公告)日：2001-02-13
申请号：JP21210099
申请日：1999-07-27
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , TANAKA TOMOAKI , IGARASHI MASAO , MAKINO NOBUYUKI
IPC分类号： C21C1/02 , C21C5/54
摘要： PROBLEM TO BE SOLVED: To reduce the desulfurizing load in a refining furnace by adjusting slag quantity before desulfurizing treatment to a value in a specified range and the slag quantity after desulfurizing treatment to a value not higher than a specified value. SOLUTION: The slag quantity before the dsulfurizing treatment is adjusted to 20-60 kg/ton of roughly molten steel and the slag quantity after the desulfurizing treatment to =1.5 and the slag composition is controlled so that the liquid phase ratio of the slag becomes >=90% and further, Al2O3 concn. in the slag to =5 mass % are desirable to be adjusted. The roughly molten steel is melted in an electric arc furnace and the molten crude steel is tapped together with the slag into a ladle and the desulfurizing treatment is executed in the ladle. For promoting the desulfurization in the ladle and making the quantity of S charged into the refining furnace in the following process stably to the low level, it is important to make the slag quantity before and after the desulfurizing treatment to be suitable and control the slag composition after the desulfurizing treatment to be in the suitable conditional range.

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