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1. 发明专利

JPH11241109A METHOD FOR INJECTING PULVERIZED FINE COAL AND REDUCING GAS INTO BLAST FURNACE 失效
公开(公告)号：JPH11241109A
公开(公告)日：1999-09-07
申请号：JP26907498
申请日：1998-09-08
申请人： NIPPON STEEL CORP
发明人： MATSUZAKI SHINROKU , IDENO TADASHI , YAMAGUCHI KAZUYOSHI
IPC分类号： C21B5/00 , C21B7/00
摘要： PROBLEM TO BE SOLVED: To provide a blast furnace operating method for injecting pulverized fine coal together with reducing gas, at the time of injecting the pulverized fine coal through a tuyere part in the blast furnace. SOLUTION: At the time of injecting the pulverized fine coal through the tuyere 12 in the blast furnace, beforehand the pulverized fine coal is supplied into a gasifying furnace at an outside of the blast furnace, and oxygen is supplied to produce the reducing gas. The reducing gas and the pulverized fine coal are simultaneously supplied from each lance, respectively, in two lances 17, 18 faced to the inner part of a blow pipe 13 in the tuyere in the blast furnace or the pulverized fine coal and the reducing gas are simultaneously supplied through a double tube lance or the reducing gas through a single tube lance and the pulverized fine coal from the inner tube and the oxygen from the outer tube in the double tube lance are simultaneously supplied. The furnace heat in the blast furnace is secured and the rate for tapping molten iron is improved and the lowering of fuel ratio is obtd. and the stable supply of the molten iron can be obtd.

2. 发明专利

JPH10219315A OPERATION OF INJECTION OF POWDERY IRON SOURCE IN BLAST FURNACE 失效
公开(公告)号：JPH10219315A
公开(公告)日：1998-08-18
申请号：JP3975197
申请日：1997-02-10
申请人： NIPPON STEEL CORP
发明人： YAMAGUCHI KAZUYOSHI , ARAKI KYOICHI
IPC分类号： C21B5/00
摘要： PROBLEM TO BE SOLVED: To obtain molten iron having stable quality while holding sulfur to low level during tapping the molten iron without raising the fuel ratio by adjusting gas utilizing ratio at the peripheral part in a furnace and the injecting quantity of powdery iron source and making a specific value or lower of S concn. in the metal in a raceway, at the time of alternately charging iron ore and coke layer by layer from a furnace top part and injecting auxiliary fuel and the powdery iron source from a tuyere part. SOLUTION: The S concn. becomes

3. 发明专利

JPH09170008A OPERATION METHOD FOR BLOWING LARGE AMOUNT OF PULVERIZED COAT IN BLAST FURNACE 失效
公开(公告)号：JPH09170008A
公开(公告)日：1997-06-30
申请号：JP34828495
申请日：1995-12-19
申请人： NIPPON STEEL CORP
发明人： YAMAGUCHI KAZUYOSHI
IPC分类号： C21B5/00
摘要： PROBLEM TO BE SOLVED: To suppress the increase in the amt. of the powder coke to be generated, to lower a fuel ratio and to improve productivity by changing the hot reactivity of the coke to be charged into a blast furnace from the furnace top according to the amt. of the pulverized coal flown into the furnace. SOLUTION: The hot reactivity (CRI) of the coke to be charged into the blast furnace from the furnace top is changed according to the amt. of the pulverized coal in the operation of blowing a large amt. of the pulverized coal into the furnace. For example, the change rate of zero is determined as reference if the amt. of the pulverized coal to be blown is below 100kg/t and the change rate of about +5% is determined as the reference when the amt. of the pulverized coal to be blown exceeds 200kg/t. The change rate of the JIS reactivity (JISR) of the coke may be adopted in place of the change rate of the hot reactivity (CRI) of the coke. As a result, the generation of the powder coke in raceways may be suppressed. The amt. of the pulverized coal to be blown may be increased to 170kg/t or above while the desired production quantity and fuel ratio are maintained.

4. 发明专利

JPH08260009A METHOD FOR BLOWING PLASTIC POWDER TO BLAST FURNACE 失效
公开(公告)号：JPH08260009A
公开(公告)日：1996-10-08
申请号：JP8770895
申请日：1995-03-22
申请人： NIPPON STEEL CORP
发明人： SUGIYAMA TAKASHI , YAMAGUCHI KAZUYOSHI
IPC分类号： C21B5/00 , C21B5/02
摘要： PURPOSE: To stably blow plastic powder and to lower a fuel ratio by specifying a relation between the ratio of the smallest bore of a plastic powder-blowing piping and the grain size of the plastic powder and the ratio of a powder flow rate to gas flow rate. CONSTITUTION: The plastic powder is transported to a tuyere by adjusting the relation between the pipe diameter ratio a which is the ratio of the smallest bore of the plastic powder-blowing piping to the average grain size of the plastic powder and the solid-air ratio γ which is the ratio of the flow rate of the plastic powder to the flow rate of the gas for blowing the plastic powder so as to satisfy the equation: γ

5. 发明专利

JPH07278634A OPERATION OF SCRAP MELTING FURNACE 失效
公开(公告)号：JPH07278634A
公开(公告)日：1995-10-24
申请号：JP6597494
申请日：1994-04-04
申请人： NIPPON STEEL CORP
发明人： NAITO MASAAKI , TAMURA KENJI , YAMAGUCHI KAZUYOSHI
IPC分类号： C21B11/02 , C21B13/02
摘要： PURPOSE:To improve the quality of molten metal and heat efficiency in a low coke ratio by charging coarse particle of coke for blast furnace into the center of a furnace separately from the peripheral coke as the supplemental method of a carburizing material to the molten metal at the time of operating a shifting layer type scrap melting furnace. CONSTITUTION:At the time of operating by charging the coke into the furnace peripheral part from the furnace top and the scrap into the intermediate part from the furnace center part, the coke is charged into the furnace center part at the ratio of the furnace core charging coke wt./charging scrap wt.=3/100 to 1/25 into the furnace center part. Further, the fine particle scrap having

6. 发明专利

JPH07278621A INJECTION METHOD OF COARSE PARTICLE POWDERED COAL IN BLAST FURNACE 失效
公开(公告)号：JPH07278621A
公开(公告)日：1995-10-24
申请号：JP9288094
申请日：1994-04-07
申请人： NIPPON STEEL CORP
发明人： YAMAGUCHI KAZUYOSHI
IPC分类号： C21B5/00 , C21B5/02
摘要： PURPOSE:To reduce the fuel ratio and increase the yield by increasing a powdered coal injection quantity while suppressing piping wear when a particle size of powdered coal is coarsened by reducing coal crushing capacity in order to increase the injection quantity over injection equipment capacity of powdered coal. CONSTITUTION:In a coarsely powdered coal of 8mm max particle size, a fine powdered coal of 0.3mm max particle size by 10-20wt.% or a reduced/powdered ore of 0.5mm max particle size/60-90% prereducing rate by 25-40wt.%, or a plastic scrap of 1.0mm max particle size by 5-15%wt, or a paraffin of 1.0mm max particle size by 10-20wt.% are mixed. Also, depending on a particle size of coarsely powdered coal, a water content quantity in coarsely powdered coal is adjusted within + or -0.5% of the water content value obtained from the relationship between a representative particle size and water content of powdered coal.

7. 发明专利

JPH06228616A OPERATION OF BLAST FURNACE 失效
公开(公告)号：JPH06228616A
公开(公告)日：1994-08-16
申请号：JP4064293
申请日：1993-02-05
申请人： NIPPON STEEL CORP
发明人： ORIMOTO TAKASHI , YAMAGUCHI KAZUYOSHI
IPC分类号： C21B5/00
摘要： PURPOSE:To keep the high productivity by executing a blast furnace operating method for preventing the lowering of temp. in the furnace wall part and the aggravation of gas ventilation and liquid penetration, in the blast furnace executing the control of the charged material distribution at the furnace top. CONSTITUTION:The temp. on the operating surface from a belly part to a bosh part in the blast furnace is detected, and when this temp. drops to lower than the preset value, sintered ore having

8. 发明专利

JPH06172829A OPERATION OF BLAST FURNACE IN BLOWING PULVERIZED COAL 失效
公开(公告)号：JPH06172829A
公开(公告)日：1994-06-21
申请号：JP35022192
申请日：1992-12-04
申请人： NIPPON STEEL CORP
发明人： TAKAMOTO YASUSHI , OKUNO YOSHIO , YAMAGUCHI KAZUYOSHI
IPC分类号： C21B5/00
摘要： PURPOSE:To effectively utilize pulverized coal and to prevent the furnace condition from getting defective due to the development of unburnt char by blowing prereduced iron powder having the specific reduction ratio together with the pulverized coal, in a blast furnace operation blowing a large quantity of the pulverized coal from a tuyere. CONSTITUTION:In the case of reducing a production cost by blowing a large quantity of the pulverized coal together with hot blast from the tuyere at the time of operating the blast furnace to reduce the consumption of expensive bulky coke for blast furnace, in order to prevent the defect that a part of the pulverized coal is accumulated in the furnace as the unburnt char to cause the defective gas ventilation and defective furnace condition and the pulverized coal is not effectively utilized because of being discharged as the unburnt char together with furnace top exhaust gas, the prereduced iron powder having >=60% the reduction ratio of Fe2O3 is blown from the tuyere together with the pulverized coal. The lowering of the temp. of combustion zone near the tuyere by endother-mic reaction caused by thermal-decomposing of the pulverized coal near the tuyere is prevented by the oxidized heat generated at the time of oxidizing the prereduced iron powder with hot blast, and the development of the unburnt char is restrained. The produced unburnt char is effectively utilized as the reduction agent for FeO in molten slag with the prereduced iron powder, without accumulating in the furnace and without being discharged fatilely together with the furnace top gas.

9. 发明专利

JPH06108124A OPERATION OF BLAST FURNACE 失效
公开(公告)号：JPH06108124A
公开(公告)日：1994-04-19
申请号：JP28230992
申请日：1992-09-29
申请人： NIPPON STEEL CORP
发明人： YAMAGUCHI KAZUYOSHI , UENO HIROMITSU , ODA HIROSHI , KAKIUCHI KAZUMOTO
IPC分类号： C21B5/00
摘要： PURPOSE:To stably realize the improvement of productivity in a blast furnace and the lowering of fuel ratio by adjusting the ratio of iron ore to coke according to alumina content in sintered ore out of the iron ore to be charged from the furnace top. CONSTITUTION:By the operational test, the relation of the alumina (Al2O3) content in the sintered ore and the ratio (O/C) of the iron ore to the coke in the furnace peripheral part, i.e., in the range from the furnace wall to the distance of 15% of the furnace opening part diameter is beforehand obtd. When the alumina content in the sintered ore is high, by lowering the O/C in the furnace peripheral part, the reduction of the sintered ore is promoted and the generation of a low m.p. compound caused by the combination of the alumina and iron oxide is restrained, and the deterioration of reducibility caused by the generation of molten liquid in the sintered ore is prevented. Further, when the alumina content therein is low, by raising the O/C in the furnace peripheral part, the rising of fused zone, the increase of gas quantity in the furnace peripheral part and the increase of radiation heat from the furnace body are prevented.

10. 发明专利

JPH04358013A METHOD FOR OPERATING BLAST FURNACE 失效
公开(公告)号：JPH04358013A
公开(公告)日：1992-12-11
申请号：JP15740891
申请日：1991-06-03
申请人： NIPPON STEEL CORP
发明人： YAMAGUCHI KAZUYOSHI , UENO HIROMITSU , OKUNO YOSHIO
IPC分类号： C21B5/00
摘要： PURPOSE:To secure the fluidity of slag and to avoid bad permeability at the time of deteriorating the fluidity of bosh slag by varying kind of pulverized coal (composition of ash) blowing from a tuyere part or Al2O3 in iron ore charged from furnace top and basicity (CaO/SiO2). CONSTITUTION:B2O3 base flux is blown from a tuyere part together with the pulverized coal and this mixing rate is adjusted so as to become 2-10% B2O3 concn. in the bosh slag. By this method, as the fluidity of bosh slag can be always secured, the permeability in the operation in the blast furnace can be stabilized and the stable supplying of molten iron can be obtd.

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