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1. 发明专利

JPH01247522A APPARATUS FOR RECOVERING REDUCED IRON POWDER IN IRON ORE PRE-REDUCING APPARATUS 失效
公开(公告)号：JPH01247522A
公开(公告)日：1989-10-03
申请号：JP7836488
申请日：1988-03-30
申请人： NIPPON STEEL CORP
发明人： NAKAMURA TAKASHI , YOSHIDA AKIHIKO , YADOUMARU SHIGEYUKI , YOSHITAKE TOMOO
IPC分类号： C21B11/00 , C21B13/00
摘要： PURPOSE:To improve the recovery ratio of reduced iron powder and the yield of reducing ore by recovering reduced iron powder contained in exhaust gas from a fluidized bed pre-reducing furnace with a cyclone and a filtration device using ceramic filter at the rear step of the cyclone. CONSTITUTION:In smelting reduction apparatus, the cyclone 10 is set at outlet side of the exhaust gas of the fluidized bed prereducing furnace 6 to catch relatively large particle in the reduced iron powder contained in the exhaust gas. Successively, small particle in the reduced iron powder is caught and recovered with the filtration device 11 using ceramic filter and arranging at the rear step of the cyclone 10. A heat exchanger 12 is set between the filtration device 11 and a dispersing tower 13, and sensible heat in the exhaust gas from the filtration device 11 is recovered. The filtration device 11 has main constructions composing of a can body 31, ceramic porous body 32 fitted in the can body 31, introducing pipe 33 for introducing the exhaust gas from the cyclone 10 and an exhaust pipe 34 for exhausting the exhaust gas after filtrating.

2. 发明专利

JPH01247520A OUTSIDE CIRCULATING TYPE FLUIDIZED BED FURNACE 失效
公开(公告)号：JPH01247520A
公开(公告)日：1989-10-03
申请号：JP7724788
申请日：1988-03-29
申请人： NIPPON STEEL CORP
发明人： EGASHIRA TATSUHIKO , YADOUMARU SHIGEYUKI , YAMAMOTO TETSUAKI
IPC分类号： C21B11/00 , C21B13/00 , F27B15/02
摘要： PURPOSE:To maintain concn. of granule in a riser to high and to improve treating efficiency by arranging a derivating tube having smaller cross sectional ratio to the riser at right angle or acute angle to the riser. CONSTITUTION:The derivating tube 3 connecting a cyclone 7 with the upper part of the riser 1 is arranged so as to become right angle or acute angle to furnace height direction of the riser 1. When the rising gas stream reaches to the upper part of the riser 1, it is rapidly turned and gone to the derivating tube 3. By this rapid turning, a large part of the floated fine ores in the gas are collided to the roof of the riser 1 and stalled, and the fine ore is separated and dropped in the riser 1. Further, the ratio A1/A0 of the cross sectional area A1 of the derivating tube 3 to the cross sectional area A0 of the riser 1 is maintained to

3. 发明专利

JPH04301017A STRUCTURE FOR NOZZLE FOR SUPPLYING REDUCING GAS 失效
公开(公告)号：JPH04301017A
公开(公告)日：1992-10-23
申请号：JP6666491
申请日：1991-03-29
申请人： NIPPON STEEL CORP
发明人： EGASHIRA TATSUHIKO , YADOUMARU SHIGEYUKI , AOYAMA KAZUTERU
IPC分类号： C21B11/00 , C21B13/00
摘要： PURPOSE:To uiformize blowing into a fluidized bed, to prevent the dropping of ores from a nozzle to ores in the fluidized bed due to the variation in gas pressure according to operational variation and to improve reduction efficiency and the operation in the structure of the nozzle for introducing fluidized bed forming gas into a fluidized bed reduction furnace for ore. CONSTITUTION:In the structure of reducing gas nozzle for fluidized bed furnace, the ratio of the length L to the inside diameter D of plural reducing gas nozzles 10 set at the bottom part of the above-mentioned fluidized bed reduction furnace is made to be L/D>=4, and the blowing of reducing gas into the fluidized bed is uniformized and the dropping of ores is prevented and the reduction efficiency and the operation are improved.

4. 发明专利

JPH0261488A OPERATION OF CERAMICS FURNACE AND HOT AIR FURNACE 失效
公开(公告)号：JPH0261488A
公开(公告)日：1990-03-01
申请号：JP21137388
申请日：1988-08-25
申请人： NIPPON STEEL CORP
发明人： OKAWA KIYOSHI , YOSHIDA AKIHIKO , YADOUMARU SHIGEYUKI
IPC分类号： C21B9/00 , F27B3/00
摘要： PURPOSE:To prevent the damage of a refractory and reduce operation cost as well as fuel consumption by a method wherein the thermal stress evaluating value of the refractory material is obtained by employing model blocks or the like and a condition that the evaluating value becomes less than 50% of the strength of the refractory material is set while actual operation is controlled so as not to apply an excessive temperature difference and/or a sudden temperature change on the refractory material. CONSTITUTION:A corresponding relation between the calculated value of a thermal stress and the condition of actual damage is examined by model test and the ratio therebetween is obtained as the thermal stress correcting coefficient Sk of a refractory material proper. Subsequently, the thermal stress of the refractory material under an actual using condition is operated from the temperature of the surface 4 thereof or a temperature in a furnace 3 and the temperature of the back surface 6 of the refractory material. The operated value is corrected by the correcting coefficient Sk to obtain a thermal stress evaluating value delta. The thermal stress evaluating value delta is compared with the average tensile strength S of the refractory material and a strength is set in an actual operation so that the evaluating value delta becomes less than 50% of the average tensile strength S of the refractory material. The temperatures of the surface 4 and the rear surface 6 of the refractory material are measured and the actual operation is effected so as not to apply any excessive thermal stress on the front and rear sides as well as the inside of the refractory material whereby the damage of the refractory material may be prevented.

5. 发明专利

JPH1161213A SWING CHUTE 失效
公开(公告)号：JPH1161213A
公开(公告)日：1999-03-05
申请号：JP23186697
申请日：1997-08-14
申请人： NIPPON STEEL CORP
发明人： YADOUMARU SHIGEYUKI , NAKAGOME TOMOMICHI , SHIGA ATSUSHI , ANABUKI YUKITAKA
IPC分类号： C21B7/20
摘要： PROBLEM TO BE SOLVED: To resolve such problems that the wearing speed becomes fast owing to collision of a large quantity of powdery and granular materials to a repulsion member in a swing chute having the repulsion member for changing the charging direction of the powdery and granular materials at the tip part and then, causing the lowering of operating ratio of the equipment and the raising of the maintenance cost owing to the necessity of frequently changing the repulsion member, at the time of charging the powdery and granular materials of raw material ore and solid fuel into a vertical furnace or a storing hopper. SOLUTION: The swing chute uses a wear resistant member 5 to the repulsion member 2 shown in the following (1)-(4). (1) The repulsion member 2 is made of the wear resistant member 5. (2) On the inner surface of the repulsion member 2, the wear resistant member 5 is arranged. (3) On the inner surface of the repulsion member, the wear resistant member is arranged so as to be attached/detached. (4) The wear resistant member is arranged by dividing into plural number.

6. 发明专利

JPH02218964A METHOD OF MEASURING FLOW VELOCITY OF HIGH TEMPERATURE POWDER 失效
公开(公告)号：JPH02218964A
公开(公告)日：1990-08-31
申请号：JP3950889
申请日：1989-02-20
申请人： NIPPON STEEL CORP
发明人： HIRANO SHINYA , SUZUKI HAJIME , TANAKA KEIHACHIRO , YADOUMARU SHIGEYUKI
IPC分类号： G01P5/22
摘要： PURPOSE:To automatically measure recirculation flow velocity by detecting the temp. fluctuation signal of the high temp. powder falling through a downcomer to statistically process the same. CONSTITUTION:In the operation of a high speed preparatory reducing furnace of a powdery ore 10 using a two-tower type recirculation fluidizing bed, the temp. of the ore 10 falling through a downcomer 6 is measured by temp. measuring sensors 14 arranged to the flow passage at the lower part of the downcomer 6 in a state separated up and down. This measuring signal is inputted to an amplifier 15 and a filter 16 to remove a high frequency variable component and a low frequency variable component and only the temp. fluctuation component of the ore 10 is detected. This fluctuation signal is inputted to a data processor 18 through an A/D converter 17. The cross-correlation function between the upper and lower fluctuation signals corresponding to powder flow passages is calculated by said processor 18 and the flow velocity of the ore 10 recirculated between two towers is measured on the basis of the delay time maximizing said function and the distance between the sensors 14, 14.

7. 发明专利

JPH01247523A METHOD FOR REFORMING EXHAUST GAS OF SMELTING REDUCTION FURNACE 失效
公开(公告)号：JPH01247523A
公开(公告)日：1989-10-03
申请号：JP7836988
申请日：1988-03-30
申请人： NIPPON STEEL CORP
发明人： MORIDERA HIROMITSU , YADOUMARU SHIGEYUKI
IPC分类号： C21B11/02 , C21B13/00 , C21B13/02
摘要： PURPOSE:To enable control of temp. of exhaust gas with independently control of reduction degree by injecting fine powdered coal just above smelting reduction furnace, passing the exhaust gas through an exhaust gas reaction passage together with the fine powdered coal to reform the exhaust gas and supplying the exhaust gas into a pre-reduction furnace after adjusting the exhaust gas. CONSTITUTION:The fine powdered coal is added from fine powdered coal injecting part 3 arranging just above the smelting reduction furnace 1. The exhaust gas from the reduction furnace 1 is passed through the exhaust gas reaction vessel 4 together with the fine powdered coal. At front stage of the reaction vessel 4, as CO2 and H2O concns. in the exhaust are increased, reaction ratio of the fine powdered coal is improved and the reductibility of the exhaust gas is improved. The temp. of exhaust gas comes to high at front step gas discharging hole 5 and low at rear step gas discharging hole 6. The exhaust gases from both waste gas discharging holes 5, 6 are mixed, to supply into an ore pre-reduction furnace 12. Then, an exhaust gas flow rate and fine powdered coal injecting rate control device adjusts the fine powdered coal injecting rate and exhaust gas flow rate based on detected results of exhaust gas temp..flow rate measuring instruments 17, 18 and exhaust gas temp..flow rate.composition measuring instrument 19.

8. 发明专利

JPH08283808A MAIN IRON TROUGH FOR BLAST FURNACE 失效
公开(公告)号：JPH08283808A
公开(公告)日：1996-10-29
申请号：JP11029495
申请日：1995-04-12
申请人： NIPPON STEEL CORP
发明人： NAKAGOME TOMOMICHI , KUZE SHUNSUKE , YADOUMARU SHIGEYUKI , NAKAMORI TAKASHI , KATAOKA SHINICHI
IPC分类号： C21B7/14
摘要： PURPOSE: To eliminate refractory demolishment and laying work of connecting parts by arranging gaps in the height direction in each of connecting parts between an iron tapping hole and a main iron trough for blast furnace, between the main iron trough for blast furnace and a molten iron trough and between the main iron trough for blast furnace and a molten slag trough. CONSTITUTION: The main iron trough 3 for blast furnace is traveled on rails 11 arranged on a casting floor. In the main iron trough 3, the gaps with steps are arranged from this trough to the iron tapping hole 2, to the molten iron trough, and to the molten slag trough, respectively. The main iron trough 3 has wheels 10 and a driving device 12 and can be driven on the rails 11. The trough 3 whose refractory is to be exchanged due to the damage, is shifted in the reverse direction to the blast furnace 1 with a driving device 12 after beforehand pulling out a cylinder 13 for fixing to the casting floor from a recessed part 14 of the trough 3 and exchanged for a spare main iron trough after repairing it with an exchanging device and the repaired trough is fixed. By this constitution, the exchanging time for the spare main iron trough can drastically be shortened.

9. 发明专利

JPH06271916A METHOD FOR MEASURING SLAG LEVEL IN BLAST FURNACE 失效
公开(公告)号：JPH06271916A
公开(公告)日：1994-09-27
申请号：JP8023693
申请日：1993-03-16
申请人： NIPPON STEEL CORP
发明人： YADOUMARU SHIGEYUKI
IPC分类号： C21B7/00 , C21B7/24
摘要： PURPOSE:To precisely measure slag level in a blast furnace. CONSTITUTION:Shock wave sensors 6A-6D are arranged at several positions in the height direction at the outer side of an iron shell 5 in a furnace hearth part of the blast furnace. The shock waves 8 from at least two positions having different heights in the height direction at the outer side of the iron shell 5 in the furnace hearth part of the blast furnace, are given in order and the intensity of reflected waves 9 to the iron shell 5 from the inside of the furnace is measured with the shock wave sensors 6A-6D. By detecting the positions varying the intensity of the reflected waves 9, the upper surface of slag 2 in the furnace is measured. By this method, the breakage accident of a tuyere, the reduction of production, etc., are prevented from happening.

10. 发明专利

JPH05117727A METHOD FOR MANUFACTURING AND SUPPLYING REDUCED ORE INTO BLAST FURNACE 失效
公开(公告)号：JPH05117727A
公开(公告)日：1993-05-14
申请号：JP28469691
申请日：1991-10-30
申请人： NIPPON STEEL CORP
发明人： EGASHIRA TATSUHIKO , KUNITOMO KAZUYA , YADOUMARU SHIGEYUKI
IPC分类号： C21B5/00
摘要： PURPOSE:To reduce coke ratio and to improve ratio of consumption of steam coal and powdery ore by injecting the powdery ore reduced in fluidized bed reduction equipment in the separate system into the lower part of a blast furnace. CONSTITUTION:Powdery coal 19 and gas 24 for combustion are injected to the tangential direction from the side surface of a cylindrical reducing gas generating furnace 23 and circularly burnt to generate the high temp. reducing gas. This reducing gas is introduced into the fluidized bed reduction apparatus, and the powdery ore 16 introduced in this apparatus is fluidizing-reduced to produce the reduced ore 33. This fluidized bed reduction apparatus is formed with a riser 18 forming the fluidized bed and a down-comer 30 connecting the top part of the riser 18 with the lower part of the riser 18 through a solid-gas separator 29. Then the reduced ore 33 is injected into the blast furnace 15 through an injecting device 35 and further, reduced to obtain molten iron.

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