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11. 发明专利

JPH04358012A METHOD FOR OPERATING BLAST FURNACE 失效
公开(公告)号：JPH04358012A
公开(公告)日：1992-12-11
申请号：JP15740991
申请日：1991-06-03
申请人： NIPPON STEEL CORP
发明人： YAMAGUCHI KAZUYOSHI , UENO HIROMITSU
IPC分类号： C21B5/00 , C21B5/02
摘要： PURPOSE:To secure permeability and liquid passing property in furnace core and to stabilize the productivity in a blast furnace by stably reducing and smelting powdery iron source blown from a tuyere part. CONSTITUTION:At the time of blowing the powdery iron source from a tuyere part into inner part in the blast furnace, fine powdery coal is blown into inner part of the blast furnace from the tuyere part together with the powdery iron source according to pre-reducing ratio of the powdery iron source. As the fine powdery coal blown from the tuyere part together with the powdery iron source is partially burnt before invading in race way and the high temp. gas is generated, the powdery iron source is preheated and when the preheated powdery iron source invades in the race way, this is quickly and perfectly reduced and smelted to make molten iron. By this method, bad permeability and bad liquid passing property in the furnace core, are prevented.

12. 发明专利

JPH04268003A METHOD FOR OPERATING BLAST FURNACE 失效
公开(公告)号：JPH04268003A
公开(公告)日：1992-09-24
申请号：JP2722691
申请日：1991-02-21
申请人： NIPPON STEEL CORP
发明人： YAMAGUCHI KAZUYOSHI , UENO HIROMITSU , TAMURA KENJI
IPC分类号： C21B5/00
摘要： PURPOSE:To maintain high replacing ratio of coke into the fine powdered coal and to avoid inferion permeability by controlling unburning char having possibility to produce when a large amount of the fine powdered coal is blown and the excess oxygen ratio goes to =1500 deg.C, gas produced quantity is increased (char produced quantity is decreased), and also the combustibility and the reactivity of the produced char are increased and reacted with CO2 and H2O in the raceway to go to CO and H2, and even in the case the excess oxygen ratio is

13. 发明专利

JPH03291315A METHOD FOR OPERATING BLAST FURNACE 失效
公开(公告)号：JPH03291315A
公开(公告)日：1991-12-20
申请号：JP9343990
申请日：1990-04-09
申请人： NIPPON STEEL CORP
发明人： YAMAGUCHI KAZUYOSHI , UENO HIROMITSU , TAMURA KENJI
IPC分类号： C21B5/00
摘要： PURPOSE:To improve productivity and to lower fuel ratio by using highly accurate coke temp. at raceway part in a blast furnace as information of furnace heat, combining it with the theoretical combustion temp. and rapidly executing operation under blasting condition for adjusting the furnace heat. CONSTITUTION:The coke temp. Tc at the raceway part in the blast furnace is detected from the tuyere part and also the ratio Tc/Tf of Tc to the theoretical combustion temp. Tf is calculated, and Tf and/or fine powdered coal quantity blown from the tuyere part are adjusted beforehand so that this ratio is in the set range. Tc can be detected under good accuracy by arranging a radiation thermometer at peeping hole part in the tuyere to measure the coke surface temp. and Tf is obtd. with the prescribed equation. At the time of maintaining Tc to the constant by adjusting Tf and the fine powdered coal quantity blown from the tuyere part, Si content in molten iron as the representative index for the furnace heat in the blast furnace, can be maintained to the constant and the furnace heat is stabilized. When Tc/Tf is not the constant only by maintaining Tc to the constant, as Tc can not be maintained to the constant, it is necessary to adjust both of Tc and Tc/Tf.

14. 发明专利

JPS6436710A BLAST FURNACE OPERATING METHOD 失效
公开(公告)号：JPS6436710A
公开(公告)日：1989-02-07
申请号：JP19345787
申请日：1987-07-31
申请人： NIPPON STEEL CORP
发明人： NAITO MASAAKI , YAMAGUCHI KAZUYOSHI , NISHI TORU , HAYASHI YOICHI
IPC分类号： C21B5/00
摘要： PURPOSE:To promote reducing reaction of iron ore by lowering temp. of heat holding zone and to improve the productivity by using coke having the specific reactivity and grain size as the coke charged in a blast furnace. CONSTITUTION:The coke having >=30% JIS reactivity is adjusted to

15. 发明专利

JPS63199813A METHOD FOR PRETREATING MOLTEN IRON BY USING PLURAL NOZZLE 失效
公开(公告)号：JPS63199813A
公开(公告)日：1988-08-18
申请号：JP2967087
申请日：1987-02-13
申请人： NIPPON STEEL CORP
发明人： ONO KATSUYA , YAMAGUCHI KAZUYOSHI , MATSUO MASATAKA , KURAYOSHI KAZUMI
IPC分类号： C21C1/00 , C21C1/02 , C21C1/04
摘要： PURPOSE:To improve the efficiency of pretreatment and to prevent temp. drop of molten iron by injecting pretreating agent to molten iron flow from plural injection nozzles arranged from the uptream side to downstream, side after heating at high temp. CONSTITUTION:After separating the molten iron 5, which is tapped from molten iron tapping hole 2 in a blast furnace 1, from slag by a skimmer, 3, it is flowed down to the molten iron branching trough 4. Plural pieces of the injection burner lances 6 are arranged from upstream side to downstream side of this molten iron flow 5 and positioned at the upper part of the molten iron flow 5. Dephos phorizing agent 8 is supplied as dividing into these lances together with carrier gas 12 or desiliconizing agent and desulfurizing agent are supplied at each lance, and also fuel 11 and oxygen 10 for aiding combustion are supplied through a control device 9, and the above pretreating agent 8, etc., is heated at about 1,000-1,500 deg.C, to inject against the molten iron flow 5. In this way, reaction velocity is remarkably improved and the molten iron 5 is effectively pretreated and also the temp. drop of the molten iron 5 is prevented.

16. 发明专利

JPS63100115A PRETREATING METHOD FOR MOLTEN IRON ON CASTING FLOOR 失效
公开(公告)号：JPS63100115A
公开(公告)日：1988-05-02
申请号：JP24424686
申请日：1986-10-16
申请人： NIPPON STEEL CORP
发明人： YAMAGUCHI KAZUYOSHI , SATO FUMIHIRO
IPC分类号： C21C1/00
摘要： PURPOSE:To effectively pretreat molten iron flowing in a trough on casting floor for a blast furnace by vibrating a lance blowing treating agent together with carrier gas in the molten iron flowing in the trough, toward the width direction of the trough. CONSTITUTION:To the molten iron flow 2 in the above trough, while vibrating the blowing lances 1 arranged, for example, at two steps toward width direction of the trough, the treating agent, such as de-siliconizing agent, dephosphorizing agent, desulfurizing agent, etc., is blown into the molten iron together with the carrier gas from the lance 1. In this way, contacting ratio of the treating agent to the molten iron at the width direction of the trough is remarkably increased as compared with the conventional method. Therefore, to the molten iron flowing in the trough, the reaction efficiency is improved at any part toward width direction. Further, in the figure, 3, 4, 5 show the wall part of molten iron trough, the bottom part of molten iron trough and the treating agent suspending in the molten iron, respectively.

17. 发明专利

JPS6389611A PRETREATING METHOD FOR MOLTEN IRON 失效
公开(公告)号：JPS6389611A
公开(公告)日：1988-04-20
申请号：JP23325586
申请日：1986-10-02
申请人： NIPPON STEEL CORP
发明人： HIRAI MASAZUMI , TSUJINO RYOJI , SATO FUMIHIRO , MORII KAZUYUKI , YAMAGUCHI KAZUYOSHI
IPC分类号： C21C1/02
摘要： PURPOSE:To efficiently execute de-phosphorization by molten iron pretreatment and to minimize the temp. loss by injecting powder made of suitably blending lime, iron oxide and fluorite from a lance set a molten iron through for a blast furnace, sintering and blowing the formed powdery body into the molten iron. CONSTITUTION:In the molten iron through for the blast furnace, de-phosphorizing agent is injected through the lance set on the molten iron or submerged in the molten iron to de-phosphorize. In the above pretreatment for the molten iron, the lime, iron oxide of mill scale or sand iron and fluorite are blended, so as to become to 0.25-0.82 CaO/(FeO+Fe2O3)wt. ratio and 0-30wt% CaF2, and the powder obtd. by crushing after sintering or melting, is used as the de-phosphorizing agent. In this way, the unit consumption of de-phosphorizing agent and temp. loss are reduced and low phosphorous steel is produced at low cost.

18. 发明专利

JPS6369906A PRETREATING METHOD FOR MOLTEN IRON AT CASTING FLOOR 失效
公开(公告)号：JPS6369906A
公开(公告)日：1988-03-30
申请号：JP21260286
申请日：1986-09-11
申请人： NIPPON STEEL CORP
发明人： SATO FUMIHIRO , MORII KAZUYUKI , HIRAI MASAZUMI , TSUJINO RYOJI , YAMAGUCHI KAZUYOSHI
IPC分类号： C21C1/00 , C21C1/02 , C21C1/04
摘要： PURPOSE:To prevent molten iron at high reaction efficiency, by blowing treating agent into the molten iron continuously flowing in a trough from plural blowing lances and setting up suitably the upper limit quantity of the treating agent blown from each lance and an interval of lance. CONSTITUTION:In a casting floor of blast furnace, the treating agent, such as desiliconizing agent, desulfurizing agent, dephosphorizing agent, etc., is blown into the molten iron 2 continuously flowing in the trough from the plural blowing lances 1a, 1b arranged above the molten iron 2 or as submerging into the molten iron 2 together with carrier gas. In the pretreating method for molten iron at the casting floor in the blast furnace having the above constitution, the upper limit quantity of treating agent from the one piece of blowing lance 1a is to decide to 25kg/t. Further, in case of needing more blowing quantity than the above, plural pieces of lances 1a, 1b are used and the interval between each lance is blown under condition of keeping from >=1.0m. In this way, dispersion of the treating agent blown is improved and the treating efficiency is improved by relaxing the adverse effect caused by interference between the lance.

19. 发明专利

JPS6223913A OPERATING METHOD FOR BLAST FURNACE 失效
公开(公告)号：JPS6223913A
公开(公告)日：1987-01-31
申请号：JP16351285
申请日：1985-07-24
申请人： NIPPON STEEL CORP
发明人： YAMAGUCHI KAZUYOSHI , TSUDA AKIHIRO , NAKAMORI TAKASHI , AMANO SHIGERU
IPC分类号： C21B7/24 , C21B5/00
摘要： PURPOSE:To improve control accuracy and to stabilize the operation of a blast furnace by inserting microwave sensors into the charge in the blast furnace, detecting the layer thickness ratio of ore and coke and the grain size of the charge and controlling the distribution of the charge in accordance with the information thereon. CONSTITUTION:Plural pieces of the microwave sensors such as probes 5 are inserted at approximately equal intervals into the charge 3 in the circumferential or radial direction of the blast furnace from the wall 1 of the furnace. The intensities of the microwaves transmitted through and reflected from the charge 3 are detected by transmitter and receivers 6. A signal processing unit 7 calculates the layer thickness ratio of the ore and coke and the grain size of the charge upon receipt of the signals therefrom. A movable armor and swiveling chute are moved according to such information, by which the balance between the layer thickness ratio of the ore and coke in the circumferential direction and the grain size of the charge is adjusted and the efficiency of the blast furnace is stably improved.

20. 发明专利

JPS61270320A METHOD FOR OPERATING BLAST FURNACE TO ATTAIN LOW SI 失效
公开(公告)号：JPS61270320A
公开(公告)日：1986-11-29
申请号：JP11165085
申请日：1985-05-24
申请人： NIPPON STEEL CORP
发明人： OKUDA KOSUKE , YAMAGUCHI KAZUYOSHI
IPC分类号： C21B5/02 , C21B5/00
摘要： PURPOSE:To effectively obtain low Si pig iron by the stable operation of a blast furnace by charging iron ore having inferior reducibility among iron ores to be charged along the wall of the furnace so as to drop unreduced ore on the raceway. CONSTITUTION:When an ore layer 4 is formed on a coke layer 3 in a blast furnace, a larger amount of ores is charged at the center 2 of the furnace, a mountain M or a terrace T is formed in front of the wall 1 of the furnace, and ore 5 having inferior reducibility is put on the mountain M or the terrace T. By this method, the amount of raw ore dropped is regulated and the concn. of Si in pig iron tapped off can be lowered.

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