WO2013094230A1 - 高炉操業方法 - Google Patents

高炉操業方法 Download PDF

Info

Publication number
WO2013094230A1
WO2013094230A1 PCT/JP2012/055893 JP2012055893W WO2013094230A1 WO 2013094230 A1 WO2013094230 A1 WO 2013094230A1 JP 2012055893 W JP2012055893 W JP 2012055893W WO 2013094230 A1 WO2013094230 A1 WO 2013094230A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulverized coal
blast furnace
less
lance
gas
Prior art date
Application number
PCT/JP2012/055893
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
大樹 藤原
明紀 村尾
渡壁　史朗
Original Assignee
Ｊｆｅスチール株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=48669724&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2013094230(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from JP2011279954A external-priority patent/JP5923967B2/ja
Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to BR112014015336-1A priority Critical patent/BR112014015336B1/pt
Priority to KR1020147019598A priority patent/KR101629123B1/ko
Priority to EP18181898.0A priority patent/EP3421618B1/de
Priority to EP23184934.0A priority patent/EP4283233A1/de
Priority to CN201280063993.6A priority patent/CN104024440B/zh
Priority to AU2012355194A priority patent/AU2012355194B2/en
Priority to IN1261KON2014 priority patent/IN2014KN01261A/en
Priority to EP12860851.0A priority patent/EP2796566B1/de
Publication of WO2013094230A1 publication Critical patent/WO2013094230A1/ja

Links

Images

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/168—Introducing a fluid jet or current into the charge through a lance
    • F27D2003/169—Construction of the lance, e.g. lances for injecting particles

Definitions

  • the present invention relates to a method of operating a blast furnace in which pulverized coal is blown from a blast furnace tuyere and the combustion temperature is increased to improve productivity and reduce exhaust CO 2 .
  • Blast furnaces mainly use pulverized coal blown from coke and tuyere as a reducing material. From the difference in carbon dioxide emissions generated by pretreatment, it is possible to use pulverized coal rather than coke as much as possible for CO 2 emissions. Leads to suppression.
  • Patent Document 1 pulverized coal with a pulverized coal ratio of 150 kg / t-pig iron or more and volatile content of 25 mass% or less is used, and pulverized coal and oxygen are supplied to a lance for injecting fuel from the tuyere Combustion efficiency can be improved by setting the oxygen concentration of the gas to 70 vol% or more.
  • a mixture of oxygen and pulverized coal is blown from the lance.
  • the lance is a double pipe
  • the pulverized coal is injected from the inner pipe of the double pipe lance. It has also been proposed to blow oxygen from the outer tube of the double tube lance.
  • the pulverized coal ratio is the mass of pulverized coal used per 1 ton of pig iron.
  • Patent Document 3 when pulverized coal is blown from the inner pipe of the double pipe and oxygen is blown from the outer pipe of the double pipe lance, the inner pipe of the double pipe lance is made shorter than the outer pipe. That is, the contact property between the pulverized coal and oxygen is improved by using the pulverized coal blowing tip of the inner tube as the front side in the blowing direction from the oxygen blowing tip of the outer tube.
  • 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 that can improve the combustion temperature and, as a result, reduce the exhaust CO 2. It is what.
  • the present invention provides the following blast furnace operating method.
  • (1) Prepare pulverized coal with a volatile content of 25 mass% or less, Preparing a double pipe lance with an inner pipe and an outer pipe for injecting pulverized coal and supporting gas from the tuyere, Hot air is blown from the tuyere, A plurality of notches recessed in the axial direction are provided in the circumferential direction in the blowing tip of the inner tube of the double tube lance, Blowing the pulverized coal with a carrier gas at a pulverized coal ratio of 150 kg / t-pig iron or more from the inner pipe, Blowing inflammable gas from the outer pipe of the double pipe lance, The oxygen concentration of the gas composed of the carrier gas and the combustion-supporting gas is 35 vol% or more, Blast furnace operation method.
  • the width of the notch is 0.1 to 0.2 in terms of the ratio of the total width of all the notches to the inner circumference of the inner tube of the double tube lance (4).
  • the blast furnace operating method described in 1. (6) The blast furnace operating method according to (2), wherein the depth of the notch is greater than 0 mm and not greater than 12 mm. (7) The blast furnace operating method according to (6), wherein the depth of the notch is 2 mm or more and 10 mm or less. (8) The blast furnace operating method according to (7), wherein a depth of the notch is 3 mm or more and 7 mm or less.
  • the number of notches corresponds to the maximum number of notches.
  • the blast furnace operating method according to (2) wherein the ratio of the number of notches exceeds 0 and is 0.8 or less.
  • the blast furnace operating method according to (1) wherein the combustion-supporting gas is oxygen, and a part of oxygen enriched in blowing is blown from an outer pipe of the double pipe lance.
  • the pulverized coal has a volatile content of 3 mass% to 25 mass%.
  • the combustion-supporting gas injected from the outer pipe of the double pipe lance has an outlet flow velocity of 20 to 120 m / sec.
  • the pulverized coal ratio is 170 kg / t-pig iron or more.
  • the pulverized coal ratio is 150 kg / t-pig iron or more and less than 170 kg / t-pig iron, and the oxygen concentration of the gas composed of the carrier gas and the combustion-supporting gas is 35 vol. Or more and less than 70 vol.%.
  • the blast furnace operating method described in 1. (27) Add at least one of the group consisting of waste plastic, solid waste fuel, organic resources, waste materials, and CDQ dust collection coke to the pulverized coal, according to any one of (1) to (26) The blast furnace operating method described. (28) The blast furnace operating method according to (27), wherein the ratio of the pulverized coal is 80 mass% or more and the waste plastic, waste solid fuel, organic resources, waste material, and CDQ dust collection coke are used.
  • the lance for injecting fuel from the tuyere is a double pipe
  • pulverized coal is blown together with the carrier gas from the inner pipe of the double pipe lance
  • the double pipe lance of the gas consisting of the carrier gas and the combustion-supporting gas in the double-pipe lance is 25 mass% or less and the pulverized coal ratio is 150 kg / t or more.
  • the oxygen concentration of the gas composed of the carrier gas and the combustion-supporting gas in the double-pipe lance is set to less than 70 vol%, thereby supporting combustion such as oxygen.
  • the basic unit of the property gas can be suppressed.
  • FIG. 8 (a) and 8 (b) are explanatory views of the pulverized coal flow of the lance comprising the lance and straight pipe of FIG. It is a graph which shows the relationship between the oxygen concentration in a lance supply gas, and a combustion rate when pulverized coal ratio is 150 kg / t-pig iron or more and less than 170 kg / t-pig iron. It is a graph which shows the relationship between the oxygen concentration in a lance supply gas when a pulverized coal ratio is 170 kg / t- pig iron or more, and a combustion rate.
  • 11A to 11C are explanatory views of the shape of the notch when viewed from the radial direction of the inner tube.
  • 12B are explanatory diagrams of the angle ⁇ formed by the center of the notch and the center of the lower end. It is explanatory drawing of experiment of the contact area of oxygen and pulverized coal, and the dispersion width of pulverized coal. It is explanatory drawing of the contact area of oxygen and pulverized coal when the width
  • 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 the reducing material is mainly combusted and gasified 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 aggregate of carbon and ash is discharged as unburned char 8 from the raceway.
  • the hot air velocity at the tip of the tuyere 3 in the direction of blowing hot air is about 200 m / sec, and the oxygen existing area 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 in the figure) 6 is blown from the lance 4 into the blower pipe 2.
  • PC Pulverized Coal in the figure
  • 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 such as a solution loss reaction and a hydrogen gas shift reaction also occurs along with the combustion reaction.
  • FIG. 4 shows a combustion mechanism when oxygen 9 is blown into the blower pipe 2 from the lance 4 together with the pulverized coal 6 as a combustion-supporting gas.
  • the method of blowing pulverized coal 6 and oxygen 9 simply shows a case of blowing 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.
  • a combustion experiment was conducted using the combustion experiment apparatus shown in FIG. Simulating the inside of the blast furnace, 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 pipe 12 so that hot air generated in the combustion burner 13 can be blown into the experimental furnace 11 as a hot air to be blown from the hot blast furnace to the blast furnace.
  • 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 oxygen 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.
  • the specifications of pulverized coal are 71.4% fixed carbon (FC), 19.5% volatile matter (VM), and 9.1% ash (Ash).
  • the air blowing conditions were as follows: air temperature 1200 ° C., flow rate 300 Nm 3 / h, tuyere wind speed 130 m / s, oxygen enrichment 6% (oxygen concentration 27.0%, air oxygen concentration 21%, richness 6.0% ).
  • a pulverized coal blowing condition a double pipe lance was used for the lance 14, pulverized coal was blown from the inner pipe of the double pipe lance, and oxygen was blown as a combustion supporting gas from the outer pipe of the double pipe lance. .
  • the pulverized coal was blown together with the carrier gas, and nitrogen was used as the carrier gas for the pulverized coal.
  • the solid-gas ratio of pulverized coal and the carrier gas that transports the pulverized coal is 10-25 kg / Nm 3 in the solid-gas ratio in the method of transporting powder, that is, pulverized coal (high concentration transport) with a small amount of gas.
  • the solid-gas ratio is 5 to 10 kg / Nm 3 .
  • air can also be used as the carrier gas.
  • the pulverized coal ratio was variously changed between 100 kg / t and 180 kg / t, and an experiment was conducted particularly on the change of the pulverized coal flow.
  • oxygen-enriched air can also be used as the combustion-supporting gas.
  • the present inventors further obtained the following knowledge. That is, when pulverized coal is blown from the inner pipe of the double pipe lance and combustion supporting gas, that is, oxygen is blown from the outer pipe, even if the volatile content of the pulverized coal is 25 mass% or less, the pulverized coal ratio is 150 kg / If the operation is a low pulverized coal ratio operation less than t, the combustion temperature increases by increasing the oxygen concentration. However, in a high pulverized coal ratio operation where the pulverized coal ratio is 150 kg / t or higher, the combustion temperature does not increase even if the oxygen concentration is increased.
  • the combustion temperature is saturated at an oxygen concentration of about 35 vol%.
  • concentration also referred to as concentration
  • oxygen blown from the outer pipe of the double pipe lance.
  • the pulverized coal is blown from the inner pipe of the double pipe lance and the combustion-supporting gas such as oxygen is blown from the outer pipe.
  • a notch is provided to promote the diffusion of pulverized coal and combustion-supporting gas, making them easy to contact and improving the combustion temperature.
  • FIG. 6 (a) shows the pulverized coal flow in the low pulverized coal ratio operation state where the pulverized coal ratio is less than 150 kg / t.
  • the dispersion width of the pulverized coal is almost constant.
  • the pulverized coal flow has a substantially uniform concentration within the dispersion width.
  • the central portion within the dispersion width is concentrated, and in particular, the pulverized coal ratio is as high as 170 kg / t or higher.
  • the central part of the pulverized coal flow is remarkably concentrated. Since oxygen is blown from the outer pipe of the double-pipe lance, the pulverized coal concentrated in the center of the pulverized coal flow does not come into contact with oxygen, but is brought into the furnace unburned to ventilate the blast furnace. make worse. Even if the oxygen blowing amount is increased to promote contact with oxygen, as shown in FIG. 6 (c), when the oxygen blowing amount becomes a certain amount or more, the oxygen flow in the central portion of the surrounding oxygen flow is increased. As the pulverized coal flow is further concentrated, the contact with oxygen is not substantially promoted, and the combustion temperature is saturated as will be described later.
  • FIG. 7A and 7B show details of the blowing tip portion of the double-pipe lance 4 of the present embodiment
  • FIG. 7A is a longitudinal sectional view
  • FIG. 7B is an A- in FIG. 7A. It is A sectional drawing. Therefore, in the present embodiment, as shown in FIG. 7, a notch 23 is provided at the blowing tip of the inner pipe 21 of the double pipe lance 4, and the pulverized coal 6 and the combustion-supporting gas are provided through the notch 23. Oxygen 9 diffuses with each other, thereby creating a state of efficient contact between the two, thereby increasing the combustion temperature.
  • the notches 23 when the inner tube 21 has an inner diameter of about ⁇ 16 mm, the notches 23 have a rectangular cross section of about 5 mm ⁇ 5 mm, and four are provided at equal intervals of 90 degrees in the circumferential direction of the inner tube 21.
  • the outer tube 22 was a straight tube.
  • the shape of the notch 23 is not limited to the above, but may be, for example, a triangular shape or a U-shape as described later, and the number of the notches 23 is also limited to the above. is not.
  • the pulverized coal 6 and the combustion-supporting gas are passed through the notch 23 as shown in FIG. Oxygen 9 can diffuse and come into contact with each other to increase the combustion temperature.
  • the pulverized coal 6 contains oxygen 9 which is a combustion-supporting gas. Concentration occurs only in the central portion, the amount of contact with oxygen 9 decreases, and the combustion temperature is saturated.
  • the notch 23 is provided in the inner tube 21 of the double-pipe lance 4, unlike the case where a projection such as a baffle is projected, the pulverized coal collides with the projection and the projection. There is no trouble such as wear.
  • FIG. 9 shows a double pipe with a pulverized coal ratio of 150 kg / t, a volatile content of pulverized coal of 25 mass% or less, a constant blowing condition, a constant oxygen enrichment rate, and a notch 23 provided at the blowing tip of the inner pipe 21.
  • the combustion temperature in the case of using the lance 4 and in the case of using the double tube lance 4 having no notch at the blowing tip portion of the inner tube 21 is represented by a combustion rate.
  • pulverized coal was blown from the inner pipe of the double pipe lance 4, and oxygen was blown from the outer pipe as a combustion-supporting gas.
  • the oxygen concentration of the gas composed of the carrier gas for conveying the pulverized coal in the lance and the combustion-supporting gas. Is over 35 vol%, the combustion temperature will be saturated. That is, in the case of the double pipe lance 4 in which the inner pipe 21 is not cut, the combustion temperature does not increase even if the oxygen concentration is 35 vol% or more.
  • the combustion temperature becomes high even if the oxygen concentration of the gas composed of the carrier gas and the combustion-supporting gas is 35 vol% or more. This means that the pulverized coal flow blown from the double pipe lance 4 is not concentrated in the region where the pulverized coal ratio is 150 kg / t or more and less than 170 kg / t.
  • the pulverized coal ratio is 170 kg / t or more, as shown in FIG.
  • the combustion temperature is saturated, and the combustion temperature does not increase even if the oxygen concentration is further increased. That is, in the region where the pulverized coal ratio is 170 kg / t or more, the combustion efficiency is not improved simply by increasing the oxygen consumption rate when the oxygen concentration of the gas composed of the carrier gas and the combustion-supporting gas in the lance is 70 vol% or more.
  • the pulverized coal ratio is set to 150 kg / t or more and less than 170 kg / t, or the pulverized coal ratio is 170 kg / t.
  • the oxygen concentration of the gas composed of the carrier gas and the combustion-supporting gas is 35 vol% or more and less than 70 vol%, preferably 40 vol% or more and 65 vol% or less, more preferably 45 vol% or more and 60 vol% or less.
  • the upper limit of the pulverized coal ratio is 300 kg / t or less, preferably 250 kg / t or less.
  • the shape of the notch 23 when viewed from the radial direction of the inner tube 21 is a quadrangle as shown in FIG. 11A, a triangle as shown in FIG. 11B, and as shown in FIG. 11C.
  • the notch size is simply expressed by the width of the opening of the notch 21 and the depth from the opening of the notch 21 to the bottom.
  • the angle ⁇ formed by the center of the notch 23 and the center of the lower end specifically, the angle ⁇ formed by the line connecting the center of the opening and the center of the bottom of the notch 23 and the string connecting the opening is shown in FIG. As shown, it is preferably 30 to 90 °.
  • FIG. 14 shows the contact area between oxygen and pulverized coal and the dispersion width of pulverized coal when the width of the notch is variously changed.
  • the width of the notch is expressed as the ratio of the total width of all the notches to the inner circumference of the inner pipe.
  • the contact area of oxygen and pulverized coal and the dispersion width of the pulverized coal are the same for the inner pipe without notches. Expressed as a ratio when used.
  • the width of the notch is increased, the contact area between oxygen and pulverized coal and the dispersion width of pulverized coal increase, but the dispersion width of pulverized coal tends to decrease from a certain point.
  • the width of the notch is preferably more than 0 and not more than 0.5, more preferably not less than 0.05 and not more than 0.3, as a ratio of the total width of all notches to the outer circumference of the inner tube. More preferably, it is 0.1 or more and 0.2 or less.
  • FIG. 15 shows the contact area between oxygen and pulverized coal and the dispersion width of pulverized coal when the depth of the notch is variously changed.
  • the depth of the notch is represented by the dimension of the depth itself, and the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal are represented by the ratio when an inner pipe without a notch is used.
  • the contact area between oxygen and pulverized coal and the dispersion width of pulverized coal increase, but the dispersion width of pulverized coal tends to decrease from a certain point.
  • the depth of the notch exceeds 0 in dimension and is preferably 12 mm or less, more preferably 2 mm or more and 10 mm or less, and further preferably 3 mm or more and 7 mm or less.
  • FIG. 16 shows the contact area between oxygen and pulverized coal and the dispersion width of pulverized coal when the number of notches is changed variously.
  • the number of notches was represented by the ratio of the number of notches to the maximum number of notches, and the contact area between oxygen and pulverized coal and the dispersion width of pulverized coal were represented by the ratio when an inner pipe without notches was used.
  • the maximum number of notches is an integer part obtained by dividing the inner peripheral length of the inner tube by the width of the notch, and specifically, how many notches of a predetermined width can be formed at the maximum in the inner tube. It represents.
  • the number of notches is preferably more than 0 and not more than 0.8 in the ratio of the number of notches to the maximum number of notches, more preferably not less than 0.1 and not more than 0.6, still more preferably. It shall be 0.2 or more and 0.5 or less.
  • FIG. 17 shows the contact area of oxygen and pulverized coal and the dispersion width of pulverized coal when the notch shape is a square and a triangle, and the width of the notch is variously changed.
  • FIG. 17 is obtained by overwriting the above-described FIG. 14 with the experimental result of the triangular notch.
  • the width of the notch is expressed as the ratio of the total width of all the notches to the inner circumference of the inner pipe.
  • the contact area of oxygen and pulverized coal and the dispersion width of the pulverized coal are the same for the inner pipe without notches. Expressed as a ratio when used.
  • the width of the notch is preferably greater than 0 and less than or equal to 0.5, more preferably 0, as a ratio of the total width of all the notches with respect to the outer periphery of the inner pipe, regardless of the shape of the notch itself. .05 or more and 0.3 or less, more preferably 0.1 or more and 0.2 or less.
  • the outer tube of the double tube lance is easily exposed to high temperatures.
  • the lance is composed of, for example, a stainless steel pipe.
  • water cooling called a so-called water jacket is performed outside the lance
  • the tip of the lance cannot be covered.
  • the tip of the outer tube of the double tube lance that is not subject to water cooling is easily deformed by heat. If the lance is deformed, that is, bent, gas or pulverized coal 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 gap with the inner pipe is closed, and if the gas does not flow from the outer pipe, the outer pipe of the double pipe lance is melted, and in some cases, the blower pipe is damaged. There is a possibility. If the lance is deformed or worn out, 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 the outer tube of a double-pipe lance that cannot be cooled with water is to cool it with the gas flowing inside.
  • the gas flow rate is considered to affect the lance temperature. Therefore, the inventors measured the temperature of the lance surface by variously changing the flow rate of the gas blown from the outer pipe of the double pipe lance.
  • the experiment was performed by blowing oxygen from the outer pipe of the double pipe lance and blowing pulverized coal from the inner pipe, and the gas flow rate was adjusted by adjusting the amount of oxygen supplied from the outer pipe.
  • the oxygen 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.
  • the steel pipe called 20A schedule 5S was used for the outer pipe of the double pipe lance.
  • a steel pipe called 15A schedule 90 was used as the inner pipe of the double pipe lance, and the total flow rate of oxygen and nitrogen blown from the outer pipe was variously changed to measure the temperature of the lance surface.
  • 15A and 20A are nominal dimensions of the outer diameter of the steel pipe 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. In that case, the outer diameter of the steel pipe is specified in JIS G 3453, and 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 outer pipe of the double pipe lance is 20 m / sec or more, the double pipe lance is not deformed or bent.
  • the outlet flow velocity of the outer pipe of the double pipe lance exceeds 120 m / sec, it is not practical in terms of the operating cost of the equipment, so the upper limit of the outlet flow velocity of the outer pipe of the double pipe lance is 120 m / sec. did.
  • 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. However, when ensuring combustibility and considering the supply from the lance and the supply to the lance, 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.
  • anthracite coal may be used as the solid reducing material in addition to coal having a volatile content of 25 mass% or less.
  • Anthracite has a volatile content of 3-5 mass%. Therefore, in this invention, the pulverized coal to be used is expressed as pulverized coal having an volatile content of 3 mass% or more and 25 mass% or less including anthracite coal.
  • pulverized coal is mainly used, and waste plastic, waste solid fuel (RDF), organic resources (biomass), waste material, and CDQ dust collecting coke may be used therein.
  • CDQ dust collection coke is coke powder collected by a dry fire extinguisher (CDQ).
  • CDQ dust collection coke is coke powder collected by a dry fire extinguisher (CDQ).
  • CDQ dust collection coke is coke powder collected by a dry fire extinguisher (CDQ).
  • CDQ dust collection coke is coke powder collected by a dry fire extinguisher (CDQ).
  • CDQ dust collection coke is coke powder collected by a dry fire extinguisher (CDQ).
  • CDQ dust collection coke is coke powder collected by a dry fire extinguisher (CDQ).
  • CDQ dust collection coke is coke powder collected by a dry fire extinguisher (CDQ).
  • CDQ dust collection coke is preferably 80 mass% or more.
  • 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 for the solid reducing material is reduced, and the CDQ dust collection coke has a high calorific value, it is difficult to ignite because there is no volatile matter, and the substitution efficiency is reduced, so the proportion of pulverized coal is 80 mass% or more It is preferable that
  • waste plastics, waste solid fuel (RDF), organic resources (biomass), and waste materials can be used with pulverized coal as fine particles of 6 mm or less, preferably 3 mm or less.
  • the CDQ dust collecting coke can be used as it is.
  • 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.
  • the lance 4 for injecting fuel from the tuyere 3 is a double pipe
  • pulverized coal is injected from the inner pipe 21 of the double pipe lance 4
  • the double pipe lance is used.
  • oxygen (flammable gas) is blown from the outer pipe 22
  • a notch 23 is provided at the blowing tip of the inner pipe 21 of the double pipe lance 4
  • a carrier gas and a flammable gas for conveying pulverized coal is conveying pulverized coal.
  • the combustion temperature is increased even in a high pulverized coal ratio operation where the volatile content of the pulverized coal is 25 mass% or less and the pulverized coal ratio is 150 kg / t or more.
  • exhausted CO 2 can be reduced.
  • the oxygen intensity is suppressed by setting the oxygen concentration of the gas composed of the carrier gas for conveying the pulverized coal and the combustion-supporting gas to less than 70 vol%. Can do.
  • the diffusion of pulverized coal and combustion-supporting gas is promoted, and the combustion efficiency is further improved. Can do.
  • blowing a part of oxygen enriched in blowing air (as a combustion-supporting gas) from the outer tube 22 of the double tube lance 4 the oxygen balance can be excessively supplied without impairing the gas balance in the blast furnace. This can be avoided and the basic unit of oxygen used can be reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture Of Iron (AREA)
  • Blast Furnaces (AREA)
PCT/JP2012/055893 2011-12-21 2012-03-01 高炉操業方法 WO2013094230A1 (ja)

Priority Applications (8)

Application Number Priority Date Filing Date Title
BR112014015336-1A BR112014015336B1 (pt) 2011-12-21 2012-03-01 Método de operação de alto-forno
KR1020147019598A KR101629123B1 (ko) 2011-12-21 2012-03-01 고로 조업 방법
EP18181898.0A EP3421618B1 (de) 2011-12-21 2012-03-01 Zwei-röhrige lanze
EP23184934.0A EP4283233A1 (de) 2011-12-21 2012-03-01 Zwei-röhrige lanze
CN201280063993.6A CN104024440B (zh) 2011-12-21 2012-03-01 高炉操作方法
AU2012355194A AU2012355194B2 (en) 2011-12-21 2012-03-01 Blast furnace operation method
IN1261KON2014 IN2014KN01261A (de) 2011-12-21 2012-03-01
EP12860851.0A EP2796566B1 (de) 2011-12-21 2012-03-01 Betriebsverfahren für einen verbrennungsofen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-279954 2011-12-21
JP2011279954A JP5923967B2 (ja) 2010-12-27 2011-12-21 高炉操業方法

Publications (1)

Publication Number Publication Date
WO2013094230A1 true WO2013094230A1 (ja) 2013-06-27

Family

ID=48669724

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/055893 WO2013094230A1 (ja) 2011-12-21 2012-03-01 高炉操業方法

Country Status (8)

Country Link
EP (3) EP2796566B1 (de)
KR (1) KR101629123B1 (de)
CN (1) CN104024440B (de)
AU (1) AU2012355194B2 (de)
BR (1) BR112014015336B1 (de)
IN (1) IN2014KN01261A (de)
TW (1) TWI487791B (de)
WO (1) WO2013094230A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016026604A1 (de) * 2014-08-18 2016-02-25 Küttner Holding GmbH & Co. KG Verfahren zum einblasen von ersatzreduktionsmitteln in einen hochofen
CN118345209A (zh) * 2024-06-18 2024-07-16 山西晋南钢铁集团有限公司 一种高炉喷煤用煤粉分配器装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110714106B (zh) * 2019-10-30 2020-12-29 沈忠凡 一种高钛型钒钛磁铁矿的高炉优化冶炼方法
KR20220099573A (ko) * 2019-11-29 2022-07-13 닛폰세이테츠 가부시키가이샤 고로의 조업 방법

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62192509A (ja) * 1986-02-17 1987-08-24 Kobe Steel Ltd 高炉の微粉炭吹込み方法
JPH04346610A (ja) * 1991-05-22 1992-12-02 Kawasaki Steel Corp 高炉用微粉炭吹込ランス
JPH06100912A (ja) 1992-09-22 1994-04-12 Kawasaki Steel Corp 高炉用粉体燃料吹込みランス
JPH08157916A (ja) * 1994-12-01 1996-06-18 Nkk Corp 高炉への微粉炭吹き込み方法および微粉炭吹き込み用ラ ンス
JP2002047359A (ja) 2000-08-01 2002-02-12 C I Kasei Co Ltd 抗菌性ポリスチレン系熱収縮フイルム
JP4074467B2 (ja) 2002-03-29 2008-04-09 新日本製鐵株式会社 高炉での低揮発分微粉炭の燃焼性向上方法

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2994141B2 (ja) * 1992-06-16 1999-12-27 川崎製鉄株式会社 高炉への粉体燃料の吹込み方法
ES2123018T3 (es) 1992-07-01 1999-01-01 Wurth Paul Sa Dispositivo para la inyeccion de carbon pulverizado en un crisol de alto horno.
LU88553A1 (de) 1994-11-04 1996-07-15 Wurth Paul Sa Verfahren zum Verbrennen von Kunststoffabfaellen im Hochofen
JPH08260010A (ja) * 1995-03-24 1996-10-08 Nippon Steel Corp 高炉における微粉炭多量吹込み操業方法
JP3493937B2 (ja) * 1997-03-14 2004-02-03 Ｊｆｅスチール株式会社 高炉への微粉炭吹き込み方法
WO2000009763A1 (en) * 1998-08-13 2000-02-24 Pohang Iron & Steel Co., Ltd. Pulverized coal injecting apparatus
JP3450205B2 (ja) * 1998-12-25 2003-09-22 株式会社神戸製鋼所 高炉への補助燃料吹込み方法
JP3620407B2 (ja) * 2000-05-16 2005-02-16 Ｊｆｅスチール株式会社 高炉への微粉炭吹込み操業方法
KR100431868B1 (ko) 2000-12-13 2004-05-20 주식회사 포스코 미분탄 취입랜스 및 이를 이용한 미분탄 취입방법
TWI277654B (en) * 2005-01-31 2007-04-01 Jfe Steel Corp Method for operating blast furnace
LU91264B1 (en) * 2006-07-12 2008-01-14 Wurth Paul Sa Pulverized coal injection lance
CN201241161Y (zh) * 2008-08-19 2009-05-20 山东源泽工贸有限公司 高效复合式喷煤枪
CN201561440U (zh) * 2009-11-25 2010-08-25 钢铁研究总院 一种氧煤喷枪
CN102268496B (zh) * 2011-08-01 2013-01-02 张昭贵 一种高炉喷吹煤粉在风口内强化燃烧的方法和装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62192509A (ja) * 1986-02-17 1987-08-24 Kobe Steel Ltd 高炉の微粉炭吹込み方法
JPH04346610A (ja) * 1991-05-22 1992-12-02 Kawasaki Steel Corp 高炉用微粉炭吹込ランス
JPH06100912A (ja) 1992-09-22 1994-04-12 Kawasaki Steel Corp 高炉用粉体燃料吹込みランス
JPH08157916A (ja) * 1994-12-01 1996-06-18 Nkk Corp 高炉への微粉炭吹き込み方法および微粉炭吹き込み用ラ ンス
JP2002047359A (ja) 2000-08-01 2002-02-12 C I Kasei Co Ltd 抗菌性ポリスチレン系熱収縮フイルム
JP4074467B2 (ja) 2002-03-29 2008-04-09 新日本製鐵株式会社 高炉での低揮発分微粉炭の燃焼性向上方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016026604A1 (de) * 2014-08-18 2016-02-25 Küttner Holding GmbH & Co. KG Verfahren zum einblasen von ersatzreduktionsmitteln in einen hochofen
CN106795572A (zh) * 2014-08-18 2017-05-31 科特纳控股有限公司 用于在高炉中吹入替代还原剂的方法
EP3183369B1 (de) 2014-08-18 2018-11-07 Küttner Holding GmbH&Co. KG Verfahren zum einblasen von ersatzreduktionsmitteln in einen hochofen
US10472689B2 (en) 2014-08-18 2019-11-12 Küttner Holding GmbH & Co. KG Method for blowing substitute reducing agents into a blast furnace
CN118345209A (zh) * 2024-06-18 2024-07-16 山西晋南钢铁集团有限公司 一种高炉喷煤用煤粉分配器装置

Also Published As

Publication number Publication date
EP2796566A4 (de) 2015-12-02
BR112014015336B1 (pt) 2019-05-14
CN104024440A (zh) 2014-09-03
KR20140109964A (ko) 2014-09-16
AU2012355194B2 (en) 2015-09-03
AU2012355194A1 (en) 2014-07-24
CN104024440B (zh) 2016-01-20
TWI487791B (zh) 2015-06-11
KR101629123B1 (ko) 2016-06-09
EP3421618A1 (de) 2019-01-02
EP2796566A1 (de) 2014-10-29
IN2014KN01261A (de) 2015-10-16
EP2796566B1 (de) 2018-08-29
EP3421618B1 (de) 2023-09-13
TW201326405A (zh) 2013-07-01
BR112014015336A8 (pt) 2017-06-13
EP4283233A1 (de) 2023-11-29
BR112014015336A2 (pt) 2017-06-13

Similar Documents

Publication Publication Date Title
JP5923968B2 (ja) 高炉操業方法
JP5923967B2 (ja) 高炉操業方法
JP5263430B2 (ja) 高炉操業方法
KR101536626B1 (ko) 고로 조업 방법
TWI485256B (zh) 高爐操作方法
JP5522326B1 (ja) 高炉操業方法及び管束型ランス
KR101559386B1 (ko) 고로 조업 방법
WO2013011662A1 (ja) 高炉操業方法
WO2013094230A1 (ja) 高炉操業方法
WO2016139913A1 (ja) 高炉操業方法
WO2013094229A1 (ja) 高炉操業方法
JP2016148090A (ja) ランス及び高炉操業方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12860851

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2012860851

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 20147019598

Country of ref document: KR

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 2012355194

Country of ref document: AU

Date of ref document: 20120301

Kind code of ref document: A

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112014015336

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 112014015336

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20140620