380-厚板06

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1 Development of Ironmaking Technology Abstract The Japanese steel industry has a long history of introducing new and innovative technologies in the field of ironmaking. The new technologies introduced during the past ten years include technologies to use cheaper and lowergrade raw materials, measures to prolong the service life of blast furnaces and coke ovens, promotion of energy saving, use of wastes and solutions to environmental problems. This report outlines the condition of production and technological trends and technical development themes in ironmaking technologies.

2 RAR: reducing agent rate CR: coke rate PCI: pulverized coal injection PC: pulverized coal

3 () Australia South America India Others Low Robe Yandi Marra High PBrockman Mamba PBrockman Reserve (Mt) T. Fe () Al 2 O 3 () mm () Combined water () (24 fy)

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5 Charging device Inner volume Working volume Productivity RAR CR PCR Lance type Ore/Coke Blast temp. Blast moisture O 2 enrichment Top gas temp. Gas utilization CO (co) *2 Sinter ratio (SR) Pellet ratio (PR) TI (SI) Reduced degradation index (RDI) Reduced index (RI) Sinter SiO 2 Sinter CaO/SiO 2 Sinter Al 2 O 3 Sinter FeO Coke strength after reaction Coke ash Coke size DI Pig temp. Pig Si Pig S Slag rate Slag Al 2 O 3 Slag CaO/SiO 2 m 3 t/m 3 d g/nm 3 mm Double (89.6) *1 PW: Paulw Wurts, *2 co = CO 2 / (CO + CO 2 ) m 3 Kakogawa 1BF Bell Fukuyama 3BF Bell Double / Oxygen (65) (DI 3 : 92.4) Muroran 2BF PW * Single Ijmuiden 7BF Bell Single TI>5mm: Al 2 O 3 +TiO 2 : Bao steel 1BF Bell (6.48) POSCO 3BF PW * (5.98) (93.5)

6 Inner volume Productivity RAR CR Tar, PCR Ore/Coke Blast temp. Blast moisture O 2 enrichment Top gas temp. co SR + PR RI (RDI) TI Sinter SiO 2 (FeO) Sinter Al 2 O 3 Coke ash Coke size DI Pig temp. Slag rate Slag CaO/SiO 2 (Al 2 O 3 ) m 3 t/m 3 d g/nm 3 mm Fukuyama 3BF Tar 42.1 * (36.9) (4.64) DI 3 : (14) Tar injection Muroran 4BF (31.3) (5.55) DI 3 : (14.9) All coke Oita 2BF Pohang 3BF PC 98.4 PC * (35.8) (39) (5.53) (6.47) (13.5) 1.25 (14.3) PC injection * Estimated

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8 Throat, shaft, belly, bosh Bottom Hearth side wall Other equipment Scheduled stop (5) 3

9

10 () 1991 cy 21 cy PCI 78 1 TRT* 91 1 Hot stove waste heat recovery Waste heat recovery in sinter CDQ CMC or DAPS *TRT: Top pressure recovery turbine

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12 RAR CR PCR Tar Plastic Reducedore injection Base Case Case Case Case Case Case Case Case (R: Prereduction degree =.7) Miscellaneous Shaft gas Nm 3 /t (CO: 72, CO 2 : 1.5, H 2 : 11) Tuyere gas Nm 3 /t 216 (CO: 72, CO 2 : 1.5, H 2 : 11) SR Ore/Coke Blast temp. g/nm 3 Blast moisture Nm 3 /t Cold O 2 O 2 enrichment Top gas temp. H 2 co Coke ash Drop of pig temp. Slag Heat flux C sol. Shaft efficiency ( shaft) Temp. of thermal reserve zone Flame temp. Total coal rate Total carbon Tar injection (Muroran) All coke (Oita) PC injection (Pohang) PC injection Plastic injection Plastic injection + Ore injection Plastic, ore injection + MFe Plastic, ore injection, MFe + High RI coke Top gas recycling : carbon rate of producing prereduction ore : carbon rate of manufacturing O 2

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