WO2013011662A1 - 高炉操業方法 - Google Patents
高炉操業方法 Download PDFInfo
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- WO2013011662A1 WO2013011662A1 PCT/JP2012/004464 JP2012004464W WO2013011662A1 WO 2013011662 A1 WO2013011662 A1 WO 2013011662A1 JP 2012004464 W JP2012004464 W JP 2012004464W WO 2013011662 A1 WO2013011662 A1 WO 2013011662A1
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- WIPO (PCT)
- Prior art keywords
- lance
- reducing material
- pulverized coal
- blowing
- blown
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- WPHGSKGZRAQSGP-UHFFFAOYSA-N C1C2C1CCCC2 Chemical compound C1C2C1CCCC2 WPHGSKGZRAQSGP-UHFFFAOYSA-N 0.000 description 1
- JSMRMEYFZHIPJV-UHFFFAOYSA-N C1C2CCC1C2 Chemical compound C1C2CCC1C2 JSMRMEYFZHIPJV-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
- C21B7/163—Blowpipe assembly
Definitions
- the present invention improves productivity by injecting a solid reducing material such as pulverized coal and a flammable reducing material such as LNG (Liquefied Natural Gas) from the blast furnace tuyere and raising the combustion temperature. Further, the present invention relates to a method of operating a blast furnace that aims to reduce the basic unit of reducing material.
- a solid reducing material such as pulverized coal
- a flammable reducing material such as LNG (Liquefied Natural Gas)
- the ratio of low reducing material (low RAR: Abbreviation for Reducing Agent Rate) is the sum of the reducing material blown from the tuyere and the coke charged from the top of the furnace per 1 ton of pig iron. Volume) Operation is being strongly promoted.
- the blast furnace mainly uses coke and pulverized coal blown from the tuyere as a reducing material, and in order to achieve a low reducing material ratio and, in turn, carbon dioxide emission control, coke etc. is used as waste plastic, LNG, heavy oil, etc.
- Patent Document 1 Although the blast furnace operation method described in Patent Document 1 is also effective in improving the combustion temperature and reducing the reducing material basic unit as compared with the conventional method of blowing only pulverized coal from the tuyere, There is room.
- the present invention has been made paying attention to the above problems, and an object of the present invention is to provide a blast furnace operating method capable of further improving the combustion temperature and reducing the reducing material basic unit. It is.
- the blast furnace operating method uses two or more lances for blowing the reducing material from the tuyere, and the solid reducing material and the flammable reducing material from different lances.
- the axis of the lance extended from the tip of the lance that blows in the solid reducing material intersects with the axis of the lance extended from the tip of the lance that blows in the flammable reducing material and is blown in.
- the lance for blowing the solid reducing material and the lance for blowing the flammable reducing material are arranged so that the mainstream of the flammable reducing material and the mainstream of the flammable reducing material to be blown overlap each other.
- the relative distance of the radial direction of the lance which blows in the said solid reducing material and the lance which blows in a flammable reducing material is 20 mm or less, and the axis cross
- the relative distance in the radial direction of the lance for blowing the solid reducing material and the lance for blowing the flammable reducing material is 0 and the axes intersect.
- the outlet flow velocity of the lance for blowing the solid reducing material is preferably 20 to 120 m / sec.
- the lance for blowing the solid reducing material is a double pipe lance, and the solid reducing material is blown from the inner pipe of the double pipe lance and the combustion supporting gas is blown from the outer pipe of the double pipe lance, It is preferable to blow the flammable reducing material from a single pipe lance.
- oxygen-enriched air having an oxygen concentration of 50% or more is preferable.
- the outlet flow velocity of the outer tube of the double tube lance and the outlet flow velocity of the single tube lance are preferably 20 to 120 m / sec.
- the solid reducing material is preferably pulverized coal. Further, it is desirable to mix waste plastic, waste solid fuel, organic resources, and waste material with the pulverized coal of the solid reducing material. In addition, it is desirable that the ratio of pulverized coal in the solid reducing material is 80 mass% or more, and waste plastic, waste solid fuel, organic resources, and waste material are mixed and used.
- the flammable reducing material is preferably LNG, city gas, hydrogen, converter gas, blast furnace gas, or coke oven gas.
- the flows of the flammable reducing material and the solid reducing material injected from different lances overlap, and the flammable reducing material comes into contact with O 2.
- the flammable reducing material comes into contact with O 2.
- it diffuses explosively and the temperature of the solid reducing material rises significantly, thereby greatly increasing the combustion temperature and reducing the reducing material basic unit.
- the outlet flow velocity of the gas blown from the lance 20 to 120 m / sec, deformation of the lance due to temperature rise can be prevented.
- the lance that blows the solid reducing material is a double pipe lance
- the solid reducing material is blown from the inner pipe of the double pipe lance
- the combustion-supporting gas is blown from the outer pipe.
- Necessary oxygen can be secured. Further, by setting the outlet flow velocity of the outer tube of the double tube lance and the outlet flow velocity of the single tube lance to 20 to 120 m / sec, deformation of the lance due to temperature rise can be prevented.
- FIG. 1 It is a longitudinal cross-sectional view which shows one Embodiment of the blast furnace to which the blast furnace operating method of this invention was applied. It is explanatory drawing of a combustion state when only pulverized coal is blown in from the lance of FIG. It is explanatory drawing of the combustion mechanism of the pulverized coal of FIG. It is explanatory drawing of a combustion mechanism when pulverized coal and LNG are blown. It is explanatory drawing of a combustion experiment apparatus. It is explanatory drawing of a combustion experiment result. It is explanatory drawing of the distance to an ignition point when changing the relative distance of the radial direction of lances.
- FIG. 1 is an overall view of a blast furnace to which the blast furnace operating method of the present embodiment is applied.
- a blast pipe 2 for blowing hot air is connected to the tuyere 3 of the blast furnace 1, and a lance 4 is installed through the blast pipe 2.
- a combustion space called a raceway 5 exists in the coke deposit layer in the hot air blowing direction ahead of the tuyere 3, and iron ore is reduced, that is, ironmaking is mainly performed in this combustion space.
- FIG. 2 shows a combustion state when only pulverized coal 6 is blown from the lance 4 as a solid reducing material.
- the pulverized coal 6 that has passed through the tuyere 3 from the lance 4 and is blown into the raceway 5 is combusted with coke 7 and its volatile matter and fixed carbon, and the volatile matter is released and is generally called char.
- the aggregate of carbon and ash is discharged as unburned char 8 from the raceway.
- the hot air velocity in the hot air blowing direction ahead of the tuyere 3 is about 200 m / sec, and the region where O 2 exists in the raceway 5 from the tip of the lance 4 is about 0.3 to 0.5 m.
- FIG. 3 shows a combustion mechanism when only pulverized coal (PC: Pulverized Coal) 6 is blown from the lance 4 into the blower pipe 2.
- PC Pulverized Coal
- the pulverized coal 6 blown into the raceway 5 from the tuyere 3 is heated by the radiant heat transfer from the flame in the raceway 5, and the temperature of the pulverized coal 6 is rapidly increased by the radiant heat transfer and conduction heat transfer.
- the thermal decomposition starts when the temperature is raised to 300 ° C. or more, and the volatile matter is ignited to form a flame, and the combustion temperature reaches 1400 to 1700 ° C.
- the above-described char 8 is obtained. Since the char 8 is mainly fixed carbon, a reaction called a carbon dissolution reaction occurs along with a combustion reaction.
- FIG. 4 shows a combustion mechanism when LNG 9 is blown as a flammable reducing material together with pulverized coal 6 from the lance 4 into the blower pipe 2.
- the method of blowing pulverized coal 6 and LNG 9 shows a case where the pulverized coal 6 is simply blown in parallel.
- the dashed-two dotted line in a figure has shown the combustion temperature at the time of injecting only the pulverized coal shown in FIG. 3 with reference. In this way, when pulverized coal and LNG are injected simultaneously, the gas gas LNG is preferentially combusted, and it is considered that the pulverized coal is rapidly heated and heated by this combustion heat. Will rise further.
- the experimental furnace 11 is filled with coke, and the inside of the raceway 15 can be observed from the viewing window.
- a lance 14 is inserted into the blower tube 12, and hot air generated in the combustion burner 13 can be blown into the experimental furnace 11 with a predetermined blowing amount.
- this ventilation pipe 12 it is also possible to adjust the oxygen enrichment amount of ventilation.
- the lance 14 can blow either one or both of pulverized coal and LNG into the blower pipe 12.
- the exhaust gas generated in the experimental furnace 11 is separated into exhaust gas and dust by a separator 16 called a cyclone, the exhaust gas is fed to an exhaust gas treatment facility such as an auxiliary combustion furnace, and the dust is collected in a collection box 17.
- lance 4 two types are used: a single-pipe lance and a double-pipe lance. If only pulverized coal is blown using a single-pipe lance, a double-pipe lance is used. When pulverized coal is blown from the pipe and LNG is blown from the outer pipe of the double pipe lance, LNG is blown from the inner pipe of the double pipe lance and pulverized coal is blown from the outer pipe of the double pipe lance.
- the combustion temperature, combustion position, unburned char combustion status, and diffusivity were measured from a viewing window using a two-color thermometer.
- a two-color thermometer is a radiation thermometer that measures temperature using thermal radiation (electromagnetic wave movement from a high-temperature object to a low-temperature object).
- thermal radiation electromagnetic wave movement from a high-temperature object to a low-temperature object.
- it is one of the wavelength distribution types to obtain the temperature by measuring the temperature change of the wavelength distribution, and in particular to measure the wavelength distribution, the radiant energy at two wavelengths is measured and the ratio
- the temperature is measured from
- the combustion state of the unburned char is determined by collecting unburned char with a probe at a position of 150 mm and 300 mm from the tip of the lance 14 in the blast pipe 12 of the experimental furnace 11, filling the resin, polishing, and then analyzing the void in the char by image analysis. The rate was measured and judged.
- the specifications of the pulverized coal are 77.8% fixed carbon (FC), 13.6% volatile matter (VM), 8.6% ash (Ash), and the blowing condition is 29.8 kg. / H (corresponding to 100 kg per 1 ton of hot metal).
- the LNG blowing conditions were 3.6 kg / h (5 Nm 3 / h, corresponding to 10 kg per 1 ton of hot metal).
- the blowing conditions are: blowing temperature 1200 ° C., flow rate 300 Nm 3 / h, flow rate 70 m / s, O 2 enrichment +5.5 (oxygen concentration 26.5%, oxygen concentration 21% in air, richness 5.5% ).
- Solid-gas ratio of 10-25kg / Nm 3 for transporting powder that is, pulverized coal with a small amount of gas (high concentration transport), and solid-gas ratio of 5-10kg / for transporting with a large amount of gas (low-concentration transport) Nm 3 .
- Air can also be used as the carrier gas.
- the evaluation of the experimental results is based on the combustion temperature, combustion position, unburned char combustion status and diffusibility (mainly pulverized coal) when only pulverized coal is blown from a single pipe, and from the inner pipe of the double pipe lance.
- FIG. 6 shows the result of the combustion experiment described above.
- the combustion position was improved, but other items were changed. Is not seen.
- the LNG outside the pulverized coal first contacts O 2 and burns quickly, and although the heating speed of the pulverized coal is increased by the combustion heat, O 2 is consumed in the combustion of LNG, and the pulverized coal It is considered that O 2 necessary for the combustion of charcoal has decreased, the combustion temperature has not increased sufficiently, and the combustion state of unburned char has not been improved.
- the inventor of the present application uses the above-described combustion experimental apparatus and inserts two single-pipe lances into the tuyere blast pipe from the top and bottom toward the opposite sides, for example, the inside of the furnace.
- the pulverized coal was blown from the other lance
- LNG was blown from the other lance
- the distance from the pulverized coal blowing lance to the ignition point was measured by variously changing the relative distance in the radial direction of the two lances.
- the blast was enriched with oxygen.
- the measurement results are shown in FIG.
- the circle at the bottom of the figure shows the state of the lance as seen from the front side in the blowing direction inside the blower pipe.
- the radial relative distance between the two lances corresponds to the symbol D in the figure.
- FIG. 8 is a conceptual diagram of the pulverized coal flow and the LNG flow when the radial relative distance D of the two lances is large
- FIG. 9 is the case where the radial relative distance D of the two lances is small.
- the conceptual diagram of pulverized coal flow and LNG flow is shown.
- the lance axis extending from the tip of the lance blowing pulverized coal and the lance extending from the tip of the lance blowing LNG are used. However, it is not necessary to completely intersect.
- the axis of the lance that blows pulverized coal and the axis of the lance that blows LNG If the relative distance D is within 20 mm, the ignition time can be shortened.
- the ignition time can be shortened and variations can be reduced.
- the lance for blowing LNG is arranged on the furnace side (the LNG furnace side in the figure) from the lance for blowing pulverized coal, that is, the igniting time is shortened even if it is arranged in the blowing direction, the lance for blowing LNG.
- the tip position of the lance that blows in pulverized coal is matched (the tip in the figure is aligned)
- the tip position of the lance that blows in LNG is further from the tip position of the lance that blows in pulverized coal (LNG in the figure).
- the ignition time was further shortened. That is, the blowing tip position of the lance that blows LNG and the blowing lance that blows pulverized coal match in the blowing direction, or the tip position of the lance that blows LNG is in front of the blowing direction from the tip position of the lance that blows pulverized coal.
- pulverized coal will be injected into the main combustion flow of LNG that was initially injected, and the pulverized coal injected in a high temperature field in the main combustion flow of LNG will rapidly rise in temperature and shorten the ignition time. It is realized.
- a double-pipe lance is also used for the lance for blowing pulverized coal, and when using a double-pipe lance, pulverized coal is blown from the inner pipe of the double-pipe lance, O 2 was blown from the outer pipe as a combustion-supporting gas, and the distance from the tip of the double pipe lance for blowing pulverized coal and the combustion temperature were measured. LNG was blown from a single tube lance. A single pipe lance was also used when only pulverized coal was injected. The measurement results are shown in FIG.
- PC ⁇ 2 (not intersecting) in the figure shows a case where only pulverized coal is blown from the two lances in a state where the extension lines of the two single pipe lances do not intersect.
- PC and LNG (not intersecting) in the figure indicate a case where pulverized coal is blown from one lance and LNG is blown from the other lance in a state where the extension lines of the two single pipe lances do not intersect.
- PC and LNG (intersection) in the figure indicate a case where pulverized coal is blown from one lance and LNG is blown from the other lance in a state where the extension lines of two single pipe lances intersect.
- the lance is composed of, for example, a stainless steel pipe.
- the lance is water-cooled called a so-called water jacket, but the lance tip cannot be covered.
- the tip of the lance that is not subject to water cooling is easily deformed by heat.
- the lance is deformed, that is, bent, pulverized coal or LNG cannot be blown into a desired part, and there is a problem in replacing the lance that is a consumable item.
- the flow of pulverized coal may change and hit the tuyere, and in such a case, the tuyere may be damaged.
- the lance is bent and blocked, and as a result, the gas in the lance stops flowing, the lance may melt, and in some cases, the air duct may be damaged.
- the combustion temperature as described above cannot be secured, and as a result, the reducing material basic unit cannot be reduced.
- the only way to cool a lance that cannot be cooled by water is to dissipate heat with the gas supplied to the inside.
- the lance itself is cooled by releasing heat to the gas flowing inside, it is considered that the gas flow velocity affects the lance temperature. Therefore, the inventors measured the temperature of the lance surface by changing the flow rate of the gas blown from the lance in various ways.
- a double pipe lance was used, O 2 was blown from the outer pipe of the double pipe lance, and pulverized coal was blown from the inner pipe.
- the gas flow rate was adjusted by supplying O 2 blown from the outer pipe.
- the amount was adjusted.
- O 2 may be oxygen-enriched air, and 2% or more, preferably 10% or more of oxygen-enriched air is used. By using oxygen-enriched air, flammability of pulverized coal is improved in addition to cooling.
- the measurement results are shown in FIG.
- a steel pipe called 20A schedule 5S was used for the outer pipe of the double pipe lance. Further, a steel pipe called 15A schedule 90 was used as the inner pipe of the double pipe lance, and the total flow rate of O 2 and N 2 blown from the outer pipe was variously changed to measure the temperature of the lance surface.
- 15A and 20A are nominal dimensions of the steel pipe outer diameter defined in JIS G 3459, 15A has an outer diameter of 21.7 mm, and 20A has an outer diameter of 27.2 mm.
- the “schedule” is a nominal dimension of the thickness of the steel pipe specified in JIS G 3459.
- the 20A schedule 5S is 1.65 mm
- the 15A schedule 90 is 3.70 mm.
- plain steel can also be used.
- the outer diameter of the steel pipe is specified in JIS G 3453
- the wall thickness is specified in JIS G 3454.
- the temperature of the lance surface decreases inversely with the increase in the flow velocity of the gas blown from the outer pipe of the double pipe lance.
- the surface temperature of a double pipe lance exceeds 880 degreeC
- creep deformation will occur and a double pipe lance will bend. Therefore, when the steel pipe of 20A schedule 5S is used for the outer pipe of the double pipe lance and the surface temperature of the double pipe lance is 880 ° C. or less, the outlet flow velocity of the outer pipe of the double pipe lance is 20 m / sec or more. .
- the outlet flow velocity of the single tube lance is also defined as 20 to 120 m / sec. Since the single tube lance has a smaller thermal load than the double tube lance, the outlet flow velocity may be set to 20 m / sec or more as necessary.
- the pulverized coal has an average particle diameter of 10 to 100 ⁇ m.
- the combustibility is ensured and the supply from the lance to the supply to the lance is taken into consideration, it is preferably 20 to 50 ⁇ m. Good. If the average particle size of the pulverized coal is less than 20 ⁇ m, the combustibility is excellent, but the lance is easily clogged during pulverized coal transportation (gas transportation), and if it exceeds 50 ⁇ m, the pulverized coal combustibility may be deteriorated.
- the ratio of pulverized coal to the all solid reducing material is preferably 80 mass% or more.
- pulverized coal and waste plastics, waste solid fuel (RDF), organic resources (biomass), waste materials, etc. have different amounts of heat due to the reaction. It tends to be unstable.
- waste plastics, solid waste fuel (RDF), organic resources (biomass), waste materials, etc. have a lower calorific value due to the combustion reaction. Since the substitution efficiency with respect to the solid reducing material to be introduced is lowered, the ratio of pulverized coal is preferably 80 mass% or more.
- Waste plastics, solid waste fuel (RDF), organic resources (biomass), and waste materials can be mixed with pulverized coal as fine particles of 6 mm or less, preferably 3 mm or less.
- the ratio with pulverized coal can be mixed by merging with pulverized coal fed by carrier gas. You may mix and use beforehand with pulverized coal.
- LNG as a flammable reducing material
- city gas can also be used, and propane gas, hydrogen other than city gas and LNG as other flammable reducing materials.
- converter gas, blast furnace gas, and coke oven gas generated at an ironworks can be used.
- shale gas can be used as equivalent to LNG.
- Shale gas is a natural gas extracted from the shale layer, and is produced from a place other than the conventional gas field, so it is called an unconventional natural gas resource.
- the blast furnace operating method of this embodiment two or more lances for blowing the reducing material from the tuyere are used, and the axis of the lance extended from the tip of the lance for blowing LNG (flammable reducing material) Since the lance was arranged so that the axis of the lance extended from the tip of the lance that blows in pulverized coal (solid reducing material), LNG (flammable reducing material) and pulverized coal (solid) injected from different lances The mainstream overlaps with the reductant, and LNG (flammable reductant) comes into contact with O 2 and burns first, so that it explosively diffuses and the temperature of the pulverized coal (solid reductant) increases significantly. As a result, the combustion temperature is greatly improved, and the reducing material basic unit can be reduced.
- the lance that blows pulverized coal (solid reducing material) is a double pipe lance
- pulverized coal (solid reducing material) is blown from the inner pipe of the double pipe lance
- oxygen (flammable gas) is blown from the outer pipe.
- two lances for blowing the reducing material are used.
- any number of lances may be used as long as there are two or more lances.
- a double pipe lance may be used as the lance.
- you may make it blow inflammable gas, such as oxygen, and a flammable reducing material.
- the axis of the lance that extends from the tip of the lance that blows in the flammable reducing material and the axis of the lance that extends from the tip of the lance that blows in the solid reducing material intersect and are easily blown.
- the lance is arranged so that the main stream of the flammable reducing material and the main stream of the solid reducing material overlap.
- 1 is a blast furnace
- 2 is a blow pipe
- 3 is a tuyere
- 4 is a lance
- 5 is a raceway
- 6 is pulverized coal (solid reducing material)
- 7 is coke
- 8 is char
- 9 is LNG (flammable reducing material) )
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Abstract
Description
本発明は、上記のような問題点に着目してなされたものであり、より一層の燃焼温度の向上及び還元材原単位の低減を可能とする高炉操業方法を提供することを目的とするものである。
また、前記固体還元材を吹込むランスと易燃性還元材を吹込むランスの径方向の相対距離が13mm以下で軸線が交差していることがより好ましい。
また、前記固体還元材を吹込むランスと易燃性還元材を吹込むランスの径方向の相対距離が10mm以下で軸線が交差していることが最も好ましい。
また、前記ランスのうち、固体還元材を吹込むランスの出口流速を20~120m/secとすることが好ましい。
また、前記固体還元材を吹込むランスを二重管ランスとし、当該二重管ランスの内側管から固体還元材を吹込むと共に当該二重管ランスの外側管から支燃性ガスを吹込み、易燃性還元材を単管ランスから吹込むことが好ましい。支燃性ガスとしては、酸素濃度が50%以上の酸素富化空気が好ましい。
また、前記二重管ランスの外側管の出口流速及び前記単管ランスの出口流速を20~120m/secとすることが好ましい。
また、前記固体還元材の微粉炭に、廃プラスチック、廃棄物固形燃料、有機性資源、廃材を混合することが望ましい。
また、前記固体還元材の微粉炭の割合を80mass%以上として、廃プラスチック、廃棄物固形燃料、有機性資源、廃材を混合使用することが望ましい。
また、前記易燃性還元材がLNG、都市ガス、水素、転炉ガス、高炉ガス、コークス炉ガスであることが望ましい。
また、ランスから吹込まれるガスの出口流速を20~120m/secとすることにより、昇温によるランスの変形を防止することができる。
また、二重管ランスの外側管の出口流速及び前記単管ランスの出口流速を20~120m/secとすることにより、昇温によるランスの変形を防止することができる。
図1は、本実施形態の高炉操業方法が適用された高炉の全体図である。図に示すように、高炉1の羽口3には、熱風を送風するための送風管2が接続され、この送風管2を貫通してランス4が設置されている。羽口3の熱風送風方向先方のコークス堆積層には、レースウエイ5と呼ばれる燃焼空間が存在し、主として、この燃焼空間で鉄鉱石の還元、即ち造銑が行われる。
更に、前記実施形態では、易燃性還元材としてLNGを用いて説明したが、都市ガスも使用可能であり、他の易燃性還元材としては、都市ガス、LNG以外に、プロパンガス、水素の他、製鉄所で発生する転炉ガス、高炉ガス、コークス炉ガスを用いることもできる。なお、LNGと等価としてシェールガス(shale gas)も利用できる。シェールガスは頁岩(シェール)層から採取される天然ガスであり、従来のガス田ではない場所から生産されることから、非在来型天然ガス資源と呼ばれているものである。
また、微粉炭(固体還元材)を吹込むランスを二重管ランスとし、二重管ランスの内側管から微粉炭(固体還元材)を吹込み、外側管から酸素(支燃性ガス)を吹込むことにより、固体還元材の燃焼に必要な酸素を確保することができる。
また、二重管ランスの外側管の出口流速及び前記単管ランスの出口流速を20~120m/secとすることにより、昇温によるランスの変形を防止することができる。
Claims (12)
- 羽口から還元材を吹き込むためのランスを二本以上用い、固体還元材と易燃性還元材とを異なるランスから吹込む場合、固体還元材を吹込むランスの先端から延長した当該ランスの軸線と易燃性還元材を吹込むランスの先端から延長した当該ランスの軸線とが交差し且つ吹込まれる固体還元材の主流と吹込まれる易燃性還元材の主流とが重なるように固体還元材を吹込むランスと易燃性還元材を吹込むランスとを配置することを特徴とする高炉操業方法。
- 前記固体還元材を吹込むランスと易燃性還元材を吹込むランスの径方向の相対距離が20mm以下で軸線が交差していることを特徴とする請求項1に記載の高炉操業方法。
- 前記固体還元材を吹込むランスと易燃性還元材を吹込むランスの径方向の相対距離が13mm以下で軸線が交差していることを特徴とする請求項1又は2に記載の高炉操業方法。
- 前記固体還元材を吹込むランスと易燃性還元材を吹込むランスの径方向の相対距離が10mm以下で軸線が交差していることを特徴とする請求項1乃至3の何れか一項に記載の高炉操業方法。
- 前記固体還元材を吹込むランスと易燃性還元材を吹込むランスの径方向の相対距離が0で軸線が交差していることを特徴とする請求項1乃至4の何れか一項に記載の高炉操業方法。
- 前記ランスのうち、固体還元材を吹込むランスの出口流速を20~120m/secとすることを特徴とする請求項1乃至5に記載の高炉操業方法。
- 前記固体還元材を吹込むランスを二重管ランスとし、当該二重管ランスの内側管から固体還元材を吹込むと共に当該二重管ランスの外側管から支燃性ガスを吹込み、易燃性還元材を単管ランスから吹込むことを特徴とする請求項1乃至6の何れか一項に記載の高炉操業方法。
- 前記二重管ランスの外側管の出口流速及び前記単管ランスの出口流速を20~120m/secとすることを特徴とする請求項7に記載の高炉操業方法。
- 前記固体還元材が微粉炭であることを特徴とする請求項1乃至8の何れか一項に記載の高炉操業方法。
- 前記固体還元材の微粉炭に、廃プラスチック、廃棄物固形燃料、有機性資源、廃材を混合することを特徴とする請求項9に記載の高炉操業方法。
- 前記固体還元材の微粉炭の割合を80mass%以上として、廃プラスチック、廃棄物固形燃料、有機性資源、廃材を混合使用することを特徴とする請求項10に記載の高炉操業方法。
- 前記易燃性還元材がLNG、シェールガス、都市ガス、水素、転炉ガス、高炉ガス、コークス炉ガスであることを特徴とする請求項1乃至11の何れか一項に記載の高炉操業方法。
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EP12815299.8A EP2733224B1 (en) | 2011-07-15 | 2012-07-11 | Blast furnace operating method |
KR1020147000750A KR101686717B1 (ko) | 2011-07-15 | 2012-07-11 | 고로 조업 방법 |
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JP5862604B2 (ja) * | 2012-07-09 | 2016-02-16 | Jfeスチール株式会社 | 吹き込み用ランスの設計方法 |
KR101675711B1 (ko) * | 2013-04-19 | 2016-11-11 | 제이에프이 스틸 가부시키가이샤 | 고로 조업 방법 |
RU2674374C2 (ru) | 2013-08-28 | 2018-12-07 | ДжФЕ СТИЛ КОРПОРЕЙШН | Способ работы доменной печи |
KR20160120334A (ko) * | 2014-03-26 | 2016-10-17 | 제이에프이 스틸 가부시키가이샤 | 산소 고로의 조업 방법 |
JP6269533B2 (ja) * | 2015-03-02 | 2018-01-31 | Jfeスチール株式会社 | 高炉操業方法 |
JP7396319B2 (ja) | 2021-03-23 | 2023-12-12 | Jfeスチール株式会社 | 気体還元材の吹込み方法 |
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EP2733224A1 (en) | 2014-05-21 |
JP5974687B2 (ja) | 2016-08-23 |
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CN103649339A (zh) | 2014-03-19 |
EP2733224A4 (en) | 2015-10-21 |
EP2733224B1 (en) | 2017-02-15 |
US20140159287A1 (en) | 2014-06-12 |
JP2013040402A (ja) | 2013-02-28 |
TWI484041B (zh) | 2015-05-11 |
KR101686717B1 (ko) | 2016-12-14 |
US9650689B2 (en) | 2017-05-16 |
CN103649339B (zh) | 2016-06-22 |
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