WO2011153818A1 - Système de préchauffage et d'alimentation par injection de matière première - Google Patents

Système de préchauffage et d'alimentation par injection de matière première Download PDF

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Publication number
WO2011153818A1
WO2011153818A1 PCT/CN2011/000799 CN2011000799W WO2011153818A1 WO 2011153818 A1 WO2011153818 A1 WO 2011153818A1 CN 2011000799 W CN2011000799 W CN 2011000799W WO 2011153818 A1 WO2011153818 A1 WO 2011153818A1
Authority
WO
WIPO (PCT)
Prior art keywords
raw material
furnace
silo
feeding system
preheating
Prior art date
Application number
PCT/CN2011/000799
Other languages
English (en)
Chinese (zh)
Inventor
于树金
任勇
边仁杰
Original Assignee
河北文丰钢铁有限公司
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
Priority claimed from CN201010196693A external-priority patent/CN101851696B/zh
Priority claimed from CN2010202227040U external-priority patent/CN201704352U/zh
Application filed by 河北文丰钢铁有限公司 filed Critical 河北文丰钢铁有限公司
Publication of WO2011153818A1 publication Critical patent/WO2011153818A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/466—Charging device for converters
    • 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
    • F27D3/0033—Charging; Discharging; Manipulation of charge charging of particulate material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/32—Blowing from above
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • C21C5/40—Offtakes or separating apparatus for converter waste gases or dust

Definitions

  • the invention relates to a raw material preheating shot feeding system, which is especially used for an oxygen top blowing converter. Background technique
  • the raw material addition system of the existing oxygen top-blown steel converter is analyzed, wherein the raw material inlet is disposed at the lower side of the flue.
  • the disadvantage of this arrangement is that the raw material falls obliquely in the reverse direction of the rapidly rising airflow, so that the kinetic energy of the falling material is unevenly offset by the rising airflow, so that the stable parabolic trajectory cannot be maintained to the high temperature of the strong airflow stirring.
  • the zone but a part of the S-shaped curved trajectory, drifts to the low-temperature weak agitation zone of the furnace wall and forms a slag bond accumulation in this zone, which is not easy to melt, thereby causing uneven slag concentration and segregation in the entire furnace cavity, and
  • the slag speed is slow, does not meet the basic technical requirements of converter steelmaking early slag, good slag, and slag permeable slag, affecting dephosphorization, desulfurization effect and production capacity, especially not suitable for slag operation of small converter double low temperature dephosphorization smelting , thus affecting the quality of production and smelting.
  • the presence of the raw material inlet port has a certain blocking effect on the circulation of the cooling water of the hood structure, resulting in uneven cooling, causing overheating in the local area of the flue, uneven interlocking stress, water leakage, short service life, etc. .
  • the material feeding port makes the manufacturing process of the flue complicated and the manufacturing cost is high; 2)
  • the small and medium-sized converter has a narrow space, and the maintenance area has a high temperature and environment. It is very bad, and the narrow slope of the feeding port is easy to block the leakage. The average leakage of 2-3 kg/ton of steel is extremely difficult to solve.
  • the invention provides a raw material preheating and shooting feeding system capable of solving the above problems, the raw material preheating and shooting feeding system greatly improves the smelting efficiency and the smelting quality, and has the advantages of simple structure and low cost.
  • the present invention provides such a preheating shot feeding system, particularly for use in an oxygen top-blown converter, comprising: at least one shooter for initializing a feed tube to an oxygen top-blown converter (ie, so-called Small flue)
  • the material injected inside is accelerated and uniformly mixed, the at least one shot is disposed on the inner wall of the initial section of the feed pipe, or is disposed above the initial section of the feed pipe; the spiral ingredient chute Provided above the initial section of the feed pipe; and a raw material bin, a raw material heating furnace and a metering hopper; wherein a discharge opening of the weighing hopper is opposite to the dosing chute, and a center line of the dosing chute is The tangential line of the initial section of the feed tube is parallel or tangentially coincident.
  • the firer comprises a combustion device, a combustion chamber and a Lafar nozzle, wherein fuel injected into the initial section of the feed pipe enters from within the combustion device. Further preferably, the fuel used by the firer is burned by the fuel injected into the initial section of the feed pipe and having the ignition temperature, and then combusted into the combustion chamber to achieve ignition, and then the fuel
  • the material bin and the feedstock furnace are separately fed to the metering hopper or simultaneously to the metering hopper.
  • the raw material heating furnace is a drum furnace
  • the drum furnace may include: a drum shell and an end cover, the drum shell is disposed obliquely and driven to rotate by a motor reducer, The lower end is located on one side of the oxygen top blowing steel converter, and the upper end of the upper end is provided with a feeding port, the hopper is fixed on the higher end and the chute of the hopper faces the feeding port, the burner And an outlet chute is mounted on the upper end of the burner, the fire vent of the burner being opposite the center of the drum, the outlet chute being located at a lower portion of the end cap and aligned with the metering hopper.
  • the raw material heating furnace is a silo furnace
  • the silo furnace may include: a funnel-shaped silo configured to obliquely discharge; Controlling the amount of raw material in the silo; the spout; the shaped hopper, which is disposed at the lower portion of the funnel-shaped silo for receiving the discharge of the silo; and the secondary shutter for controlling the silo
  • the raw material discharge amount wherein the fire spout of the fire spout is facing the cavity of the shaped hopper and forms a secondary discharge port with the shaped hopper, and the secondary ram and the control board
  • the controlled output is equal
  • the shooter according to the present invention can also be used separately for an LF furnace (ladle refining furnace), an electric furnace or a mixed iron furnace or the like.
  • the shooter is disposed above a shooting tube and is in tangential communication with the shooting tube, the shooting tube has a curved section and is disposed in a ladle refining furnace, an electric furnace or a mixed iron furnace.
  • one of the hoppers is disposed above the firing tube and at a lower portion of the Lafar nozzle.
  • the present invention can be applied not only to an oxygen top-blown steel converter, but also to a metallizer, a mixed iron furnace, a granular metal magnesium desulfurization and molten iron pretreatment operation, and a ladle and a tundish according to the present invention. Liquid metal shot metallurgical operations of certain metals or alloys.
  • the kinetic energy of the raw material is accelerated into the molten steel to support the thermodynamics of the slag and slag involved in the chemical reaction.
  • the slagging speed is obviously 30-50 seconds faster than the existing feeding method (to recover the raw material to the gas concentration).
  • the standard time length calculation), the slag speed and chemical reaction speed are also faster than the existing methods.
  • the raw material can be heated to a certain temperature through the preheating drum or the silo furnace, which ensures that the raw material can melt at the moment of contact with the molten steel and the iron oxide, and dephosphorization and dehydration reaction occurs.
  • the mixed iron furnace is an ideal environment for desulfurization using granular metal magnesium.
  • the mixed iron furnace has a depth of molten iron of 4 to 5 meters or more.
  • the magnesium metal greatly improves the desulfurization efficiency.
  • the strength and operating cost of the existing desulfurization gun are difficult to achieve a depth of 3 to 4 meters below the molten iron, and the shooter in the embodiment of the present invention can shoot the particulate metal magnesium as long as the shooting speed is large enough.
  • the shooter used is equivalent to the rocket thruster, so the propulsion speed is easily multiplied by the speed of sound (theoretically greater than the speed of the universe), so the shooter can (equivalent to the bullet).
  • the granular magnesium metal is shot into the molten iron of 4-5 meters deep. So it can completely replace the desulfurization gun to take off Sulfur, and the size and investment of the shooter is less than one-tenth of that of the desulfurization gun, while the operating cost is less than one-third of the desulfurization gun.
  • the biggest advantage of preheating of raw materials is that it not only satisfies the purpose of rapid melting, but also compensates for the problem of insufficient physical heat in smelting and the problem of hydrogen in the steel caused by moisture in the raw materials.
  • the temperature range higher than that before the tapping is cooled by iron ore or sinter, oxygen in the iron ore or sinter (iron oxide) and in the steel.
  • Oxidation of carbon not only saves oxygen, but also directly adds iron ore or sinter to steel. It saves the process of high energy consumption in iron making and realizes direct steelmaking of iron ore or sinter. Process.
  • the structure of the hood is cylindrical, and the circulation of the cooling water is evenly cooled, so that the flue does not have problems such as water leakage due to uneven interlocking stress caused by uneven localized areas, and short service life.
  • the manufacturing process simplifies manufacturing costs.
  • the heating furnace can directly burn limestone into white ash as a raw material for smelting, omitting the production and transportation process of lime, simplifying the process and increasing the physical heat in the converter, and also solving the shortage of physical heat of the small and medium-sized converters. problem.
  • Figure 1 is a schematic view of a raw material preheating shot feeding system according to a first embodiment of the present invention
  • Figure 2 is a schematic view of a raw material preheating shot feeding system according to a second embodiment of the present invention.
  • Figure 3 is an A-direction view of the system shown in Figures 1 and 2;
  • FIG. 4 is a schematic structural view of a silo furnace according to an embodiment of the present invention.
  • FIG. 5 is a schematic view showing the structure of a shooter according to an embodiment of the present invention (wherein the shooter is used alone in an LF furnace, an electric furnace or a mixed iron furnace);
  • Figure 6 is a schematic view of an oxygen top-blown converter with a material shooting system of the present invention
  • Figure 6 (b) is a schematic view showing the relationship between the initial stage of the feed tube and the position of the shooter in Figure 6 (a);
  • FIG. 7 is a diagram showing the raw material preheating shot feeding system according to an alternative embodiment of the present invention. Schematic, wherein the shooter is placed above the initial section of the feed tube. detailed description
  • a feedstock preheating shot feeding system for an oxygen top-blown converter in accordance with a first embodiment of the present invention, comprising: at least one firer 12 for making a blow to the oxygen top converter
  • the material injected in the initial section 13 of the tube i.e., the so-called "small flue" is accelerated and mixed, and the at least one shooter 12 is disposed on the inner wall of the initial section 13 of the feed tube, as shown in Fig. 6.
  • the shooter 12 includes a combustion device 23, a combustion chamber 26, and a Lafar nozzle 24, wherein fuel injected into the initial section 13 of the feed tube enters from within the combustion device 23.
  • the fuel used by the shooter 12 is burned by the fuel injected into the initial section 13 of the feed pipe and having the ignition temperature, and then combusted into the combustion chamber 26 to achieve ignition, and then the fuel is
  • the combustion chamber 26 is again injected after combustion to promote the acceleration of the feedstock, wherein the fuel flow at the time of ignition is about 5% to 15% of the normal flow rate or the pressure is less than about 1.
  • OMpa and the fuel is preferably high pressure 0 2 and high pressure. CH fuel source.
  • the raw material silo 5 and the raw material heating furnace 2 are separately supplied to the weighing hopper 9, or simultaneously to the weighing hopper 9.
  • the raw material heating furnace 2 is a drum furnace
  • the drum furnace may include: a drum shell and an end cover, the drum shell is disposed obliquely and driven to rotate by the motor reducer 8,
  • the lower end is located on one side of the oxygen top blowing steel converter, and the upper end of the upper end is provided with a feeding port, the hopper 1 is fixed on the higher end and the chute of the hopper 1 faces the feeding port
  • the burner 4 and the outlet chute 6 are mounted on the end cap 3 of the upper end, the burner port of the burner 4 faces the center of the drum, and the outlet chute 6 is located at the lower portion of the end cap 3 and
  • the metering hopper 9 is aligned.
  • the raw material heating furnace 2 is a silo furnace, as shown in FIG. 4, the silo furnace may include: a funnel-shaped silo 17 which is arranged to be obliquely discharged; a shutter 16 for controlling the amount of raw material discharged in the silo; a spout 19; a shaped hopper 20 disposed at a lower portion of the funnel-shaped silo 17 for receiving the discharge of the silo 17;
  • the sluice gate 21 is configured to control the amount of material discharged in the silo, wherein the blast port of the blast nozzle 19 faces the cavity of the shaped hopper 20 and forms a secondary discharge port with the shaped hopper 20 And the secondary interlayer plate 21 is equal to the discharge amount controlled by the control shutter 16.
  • the heating principle of the silo furnace is that the flame combustion heat flows through the gap flow of the raw material, gradually heating the raw material, and
  • the raw material preheating shot feeding system of the present invention will be described below with reference to Figs. 1 and 6(a). It should be understood that the following description with reference to FIG. 1 is merely exemplary and does not limit the scope of the invention.
  • the partially preheated raw material preferably further comprises lime (calcium oxide) Limestone (carbonic acid), strontium ore or sinter and pellets (main component iron oxide); then, the raw materials mixed together enter via the metering hopper 9 into the initial section 13 of the feed inlet, preferably located in the oxygen top-blown converter
  • the spiral chute 11 the raw material is rotatably dropped during the descending of the spiral chute 11 to obtain a certain centrifugal acceleration; then, the fuel, preferably the high pressure 0 2 and the high pressure CH fuel source, is introduced into
  • reaction gas is discharged through the flue 103 through the small hood 101 and the hood 102 in the furnace body, and after further subsequent treatment, it can be used for various purposes such as dust removal or use as a gas, and can also be used for preheating in the raw material heating furnace.
  • the shooter 12 may also be disposed above the initial section 13 of the feed tube, as shown in FIG.
  • the shooter according to the present invention can also be used separately for a ladle refining furnace, an electric furnace or a mixed iron furnace or the like.
  • the shot 12 is disposed on a firing tube 25 and communicates with the fire tube 25 in a tangential manner, the firing tube 25 with curved segment 15 and is disposed
  • the top of, for example, a ladle refining furnace one of the hoppers 14 is disposed above the firing tube 25 and at a lower portion of the Lafar nozzle 24.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)

Abstract

La présente invention se rapporte à un système de préchauffage et d'alimentation par injection de matière première d'un convertisseur dont le soufflage en oxygène se fait par le haut. Ledit système comprend au moins un dispositif de tir (12) au moyen duquel la matière première injectée à un premier segment d'un tuyau d'alimentation (13) du convertisseur, dont le soufflage en oxygène se fait par le haut, est accélérée et mélangée de façon uniforme. Ledit ou lesdits dispositifs de tir (13) sont montés sur la paroi interne du premier segment du tuyau d'alimentation (13) ou sont montés au niveau du bord supérieur du premier segment du tuyau d'alimentation (13).
PCT/CN2011/000799 2010-06-10 2011-05-09 Système de préchauffage et d'alimentation par injection de matière première WO2011153818A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201020222704.0 2010-06-10
CN201010196693A CN101851696B (zh) 2010-06-10 2010-06-10 一种氧气顶吹炼钢转炉的原料预热射击加料系统
CN201010196693.8 2010-06-10
CN2010202227040U CN201704352U (zh) 2010-06-10 2010-06-10 一种氧气顶吹炼钢转炉的原料预热射击加料系统

Publications (1)

Publication Number Publication Date
WO2011153818A1 true WO2011153818A1 (fr) 2011-12-15

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03140409A (ja) * 1989-10-27 1991-06-14 Nippon Steel Corp 加圧型転炉に於ける副原料投入装置
JP2000146454A (ja) * 1998-11-06 2000-05-26 Daido Steel Co Ltd 溶解精錬炉における副原料投入装置
CN1280628A (zh) * 1997-12-03 2001-01-17 西德马公司 用于还原氧化铁和熔炼铁的方法及其装置
CN201180150Y (zh) * 2008-02-15 2009-01-14 刘德生 炼钢污泥烘干造球机
CN201367437Y (zh) * 2009-03-24 2009-12-23 河北文丰钢铁有限公司 一种氧气顶吹炼钢转炉
CN101851696A (zh) * 2010-06-10 2010-10-06 河北文丰钢铁有限公司 一种氧气顶吹炼钢转炉的原料预热射击加料系统
CN201704352U (zh) * 2010-06-10 2011-01-12 河北文丰钢铁有限公司 一种氧气顶吹炼钢转炉的原料预热射击加料系统

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03140409A (ja) * 1989-10-27 1991-06-14 Nippon Steel Corp 加圧型転炉に於ける副原料投入装置
CN1280628A (zh) * 1997-12-03 2001-01-17 西德马公司 用于还原氧化铁和熔炼铁的方法及其装置
JP2000146454A (ja) * 1998-11-06 2000-05-26 Daido Steel Co Ltd 溶解精錬炉における副原料投入装置
CN201180150Y (zh) * 2008-02-15 2009-01-14 刘德生 炼钢污泥烘干造球机
CN201367437Y (zh) * 2009-03-24 2009-12-23 河北文丰钢铁有限公司 一种氧气顶吹炼钢转炉
CN101851696A (zh) * 2010-06-10 2010-10-06 河北文丰钢铁有限公司 一种氧气顶吹炼钢转炉的原料预热射击加料系统
CN201704352U (zh) * 2010-06-10 2011-01-12 河北文丰钢铁有限公司 一种氧气顶吹炼钢转炉的原料预热射击加料系统

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