WO2004027097A1 - Procede de chargement de matiere brute pour creuset sans entonnoir de coulee - Google Patents

Procede de chargement de matiere brute pour creuset sans entonnoir de coulee Download PDF

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Publication number
WO2004027097A1
WO2004027097A1 PCT/JP2003/010907 JP0310907W WO2004027097A1 WO 2004027097 A1 WO2004027097 A1 WO 2004027097A1 JP 0310907 W JP0310907 W JP 0310907W WO 2004027097 A1 WO2004027097 A1 WO 2004027097A1
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WO
WIPO (PCT)
Prior art keywords
furnace
coke
raw material
blast furnace
ore
Prior art date
Application number
PCT/JP2003/010907
Other languages
English (en)
Japanese (ja)
Inventor
Hirofumi Nishimura
Shigeaki Goto
Nozomu Nishimura
Hideyuki Kamano
Shinji Hasegawa
Shin'ichiro Yamana
Masanori Takeshita
Shiro Watakabe
Takeshi Ito
Hideo Fujimoto
Original Assignee
Jfe Steel Corporation
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 JP2002250738A external-priority patent/JP4045897B2/ja
Application filed by Jfe Steel Corporation filed Critical Jfe Steel Corporation
Priority to EP03797531A priority Critical patent/EP1445334A1/fr
Priority to KR1020047007960A priority patent/KR100704691B1/ko
Priority to CN038016575A priority patent/CN1596315B/zh
Priority to BRPI0306185-0A priority patent/BR0306185B1/pt
Publication of WO2004027097A1 publication Critical patent/WO2004027097A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/20—Arrangements of devices for charging
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/008—Composition or distribution of the charge
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B11/00—Bell-type furnaces
    • 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
    • F27D19/00—Arrangements of controlling devices
    • 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
    • F27D3/10—Charging directly from hoppers or shoots
    • 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
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0028—Regulation
    • F27D2019/0068—Regulation involving a measured inflow of a particular gas in the enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2001/00—Composition, conformation or state of the charge
    • F27M2001/04—Carbon-containing material
    • F27M2001/045—Coke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2002/00—Disposition of the charge
    • F27M2002/12—Discontinuous charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2003/00—Type of treatment of the charge
    • F27M2003/16—Treatment involving a chemical reaction
    • F27M2003/165—Reduction

Definitions

  • the present invention relates to a 3 ⁇ 4 ⁇ method for a raw material for a blast furnace, and more particularly, to a method for ⁇ ⁇ ⁇ of stone and coatas in a blast furnace by inverting a bell-less system.
  • a blast furnace in which molten iron is placed in the sea, fibers and coatas are alternately formed, and a packed bed having these layers is formed at the upper part of the furnace (hereinafter referred to as a shaft).
  • the amount of one layer of the lithosphere layer and the coatas layer is called one charge ore and coatas, respectively.
  • the ore and coatas for one charge are not necessarily injected into the furnace at one time, and the ore and coatas of one charge are divided into multiple times and then injected into the furnace. ing. These divided filite and coatas are called one batch of ore and coatas, respectively.
  • the empty ⁇ X blows wisteria-enriched air into the furnace and burns the coater in the furnace.
  • Kaseki (hereinafter simply referred to as ore) is reduced and melted. Therefore, in order to improve the ⁇ 'property of the blast furnace, the ore in the shaft ⁇ the ventilation of the packed bed of coatas ⁇ : is a power to increase.
  • it has been known to mix ore and a coat and to work in a furnace. For example, Patent No.
  • 2,820,478 discloses a method of uniformly mixing coke in ore in a bellless blast furnace by elaborating the timing and amount of ore and coats from ore hopper and coke hotspot. ing.
  • the coke is moved to the center of the blast furnace and the flow of gas ascending in the furnace is greatly increased. It is also known that it is ⁇ J that makes it happen (this is called center-oriented).
  • Japanese Unexamined Patent Publication No. Sho 60-56003 ⁇ indicates that 1.5 to 8 weights of coke is produced per charge.
  • the center ⁇ ⁇ of this coatas has not only the effect of scavenging the ventilation ⁇ : in the furnace, but also the fact that there is not much ore in the center of the furnace. This has the effect of avoiding or reducing the deterioration of the coats due to the so-called "solution loss" in which coke is oxidized by dioxin, which is made by reducing ore.
  • solution loss in which coke is oxidized by dioxin, which is made by reducing ore.
  • the value of the coke itself can be lowered, the cost of converted coking coal can be reduced by using inexpensive low-rank coal, and the so-called “dead man” formed in the hearth can be obtained.
  • the coke fiber in the center of the furnace is made larger than the core diameter of the surrounding area. It should be noted that even at the age when Solross ⁇ occurs, coke reduction in the hearth can be prevented. If a dedicated coater ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ Of diameter Cans are possible.
  • a first object of the present invention is to provide a method for a bellless blast furnace capable of constantly and smoothly mixing a middle of a coat and a mixture of ore and a coat.
  • the properties of each of the specimens shelved in the blast furnace were changed: However, the blast furnace; The second purpose is to select the raw material for the blast furnace.
  • the in-furnace gas flow is formed in the central part of the furnace such that the coke is maximized in the central part of the furnace.
  • the third purpose is to make the raw material of the bellless blast furnace which enables the stable blast furnace.
  • the present invention provides a raw material for a bellless blast furnace equipped with a bellless 3 ⁇ 4 ⁇ 3 ⁇ 4 device having the following steps:
  • the present invention makes it difficult to feed a bellless blast furnace equipped with a bell-less blast furnace having the following steps:
  • the present invention is a fiberless raw material for a bellless blast furnace equipped with a bellless apparatus having the following steps:
  • Figure 1 is a cross-sectional view illustrating the bellless blast furnace com section.
  • Fig. 2 is a conceptual diagram for explaining the method of depositing raw materials according to Embodiment 1, and Fig. 2 (a) shows the timing of loading ore, and Fig. 2 (b) shows the position of ⁇ in the blast furnace. Is shown.
  • FIG. 3 is a cross-sectional view showing the deposition state of ⁇ raw material in a furnace to which the raw material method according to Embodiment 1 of the present invention is applied.
  • FIG. 4 is a cross-sectional view illustrating a ⁇ ]! Portion of the bellless blast furnace according to the embodiment '2.
  • FIG. 5 is a cross-sectional view of an example in which a mixed raw material is obtained by applying the raw material method according to Embodiment 2;
  • FIG. 6 is a diagram showing the arrangement of ⁇ shots in the bellless blast furnace according to weaving mode 3.
  • FIG. 7 is a cross-sectional view of the in-furnace transmutation using a ⁇ -shute according to Wei form 3.
  • FIG. 8 is a graph showing the gas utilization distribution in the blast furnace related to & 3.
  • FIG. 9 is a graph showing the distribution of the coarsening rate of the central coat as a function of the form of Wei morphology.
  • FIG. 10 is a diagram for explaining a raw material removal according to the fourth embodiment.
  • FIG. 11 is a graph showing the relationship between the amount of coatas discharged from the bunker (%) and the ratio (%) of 55 or more in the sample coatas in Example 4 of SS.
  • a chute having a high-level bell-less position is turned while changing its tilt angle, and a coke or stone having been subjected to a plurality of S-pan forces is formed in the furnace.
  • the discharge amount of the coatas which was one of the IGSBm pan forces, was between 5 and 50 mass% of the amount of coke for one patch. From the time of ⁇ , the discharge of the ore in another furnace top pan force is started, and the simultaneous release of the coat and the ore is referred to as the raw material method of bellless blast furnace using fiber as the method 1).
  • the blast furnace bellless ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ is rotated while the tilt angle is gradually increased gradually from zero, which is the vertical state, to turn!
  • the amount of coke stored in one of the pans reaches 5 to 50 mass% of the amount of coke for one patch, the discharge of another ore in the pan is started.
  • the coat and the ore are simultaneously mixed, only the coke is filled near the furnace center, and the mixture of the coke and the ore is filled around the furnace wall.
  • the present invention relates to a raw material for a bellless blast furnace, in which ores and coats are supplied as raw materials to a blast furnace using a bellless 3 ⁇ 4 ⁇ ⁇ device.
  • This is the method of bellless blast furnace raw material (hereinafter referred to as Wei form 2).
  • Wei form 2 bellless blast furnace raw material
  • the present invention relates to a method of a bellless blast furnace, in which an ore and ⁇ or a coat as raw materials are introduced into a blast furnace by using a Perless apparatus.
  • the center of the bellless blast furnace was set to 0, and the furnace wall was set to 1.
  • the start of Kotas started from ⁇ f standing corresponding to ⁇ .
  • coke stored in a plurality of shells f3 ⁇ 4 is cut out, sieved with a sieve provided at the bottom of the tank, the coke on the sieve is weighed through a hopper, and a pan force provided on the furnace top is sequentially passed through, and a chute at a venoreles is placed.
  • the mesh of the sieve provided in the lower part of the tank of the part of the tfilB shell f ⁇ tt is another! ? ⁇ f larger than the mesh, when fibrous coke from these shells f3 ⁇ 4 tank to the weighing hopper, first fifi ⁇ large eyes!
  • the raw material ⁇ ⁇ method (hereinafter referred to as weave form 6) of a bellless blast furnace in which at least three pans are installed in parallel.
  • Fig. 1 shows the vertical section of the blast furnace equipped with a bell-less device.
  • the raw material 2 (stone or coke) fed to the baking force 1 is called a flow gate 3, and the amount of discharge falls through a gate whose opening is haze, and turns through a vertical chute 4.
  • SHUT 5 This shunt 5 rotates horizontally around the center axis 7 of the blast furnace 6 and changes its tilt angle ( ⁇ ) with respect to the center axis 7. Can be.
  • ⁇ tilt angle
  • Weaving mode 1 is the ⁇ method of blast furnace raw material using the Kakar Berle 3 ⁇ 4 ⁇ ⁇ device, in which the coke is tilted from the center of the furnace to the furnace inversion while the tilt angle is changed by jio.
  • the ore is also simultaneously mixed in during the operation. Specifically, the space between coke and ore is as shown in Fig. 2 (a).
  • the furnace pan force (for example, la) force that is difficult to coke
  • the coke is discharged, and the amount of discharge from the pan force of the cortus is one patch of coke that was shelled to the II pan force ⁇ Tara summer to 5-5 0 weight 0/0 of lambda *, another has ⁇ ore; pan force (e.g., lb) starts discharge of the power ore.
  • pan force e.g., lb
  • FIG. 3 shows an example of a raw material deposition state in a furnace formed by performing such a process.
  • the symbols C and O in FIG. 3 indicate coke and ore, and the subscript indicates the number of patches.
  • Fig. 3 shows the age at which coke and ore were mixed after initially charging the kotas in three turns.Since immediately after the start of coke, only coke was fed to the furnace center side. deposited layer C 2 coke only is formed in the furnace central portion, since then charged ore with Kotasu the mixed layer Cs + Oi coke ⁇ Pi ore is formed.
  • the opening of the ⁇ gate 3 be difficult so that the coke and the ore are discharged at the same time.
  • the second patch of the coatus and the first patch of the ore which are obtained by dividing the coke and ore into two patches, respectively, are partially extracted and formed to form a central coat and a mixed layer.
  • the coax and the ore are each 1 char each; in dividing the ⁇ f patch into 3 ⁇ 4 rf inside the furnace ⁇ ⁇ , the layer of the cortus warworm at the center of the furnace and mixing around it The 3 ⁇ 4 ⁇ method of forming a layer can also be employed.
  • the ore is charged and mixed in the middle of the second patch of the corus. Can be.
  • the timing of the start of the discharge of coke from the ore aging from coke is started, and the release of coke from the coke is started from another pan of coke. It was within the period when 5 to 50 mass% of the coatas was discharged, for the following reasons.
  • FIG. 4 is a cross-sectional view mainly showing a part of a blast furnace having a bell-less blast furnace (hereinafter, referred to as a bell-less blast furnace).
  • ⁇ 4 the angle between the blast furnace center axis and the swing chute (hereinafter referred to as the tilt angle) is set to 0.
  • the bellless blast furnace is separated from the l panker 1 by a force S. However, one of them;) ⁇ !
  • the Kunhei raw material 20 is discharged from the bottom of the furnace top pan 1, adjusted to a predetermined flow rate when passing through the flow rate control gate 3, and then supplied to the ⁇ shout 5 via the vertical shout 4 ′. You.
  • the shot 5 rotates around the central axis of the blast furnace, and feeds the mixed raw material 20 into the blast furnace 6 while changing the tilt angle ⁇ .
  • Arrow a in FIG. 4 indicates the turning of the chute 5, and arrow t) indicates the drop of the mixed raw material 20.
  • the mixed raw material 20 is poured into the blast furnace 6 in this manner, the x chute 5 is swirled, and the f f difficulty angle ⁇ is sequentially changed, so that a wide area on the raw material deposition surface 8 of the blast furnace section is obtained.
  • the mixed raw material 20 can be removed over a period of time.
  • Figure 4 shows the bellless blast furnace with two bunkers 1 installed! Form 2 can also be applied to a bellless blast furnace with three or more HI bunkers 1 installed.
  • the mixed raw material 20 in which the ore and the coke are mixed is shelled in the bunker 1; the method is not limited to a specific method.
  • the ore weighing hopper (Fig. 3 ⁇ 43 ⁇ 4 ⁇ 3 ⁇ 43 ⁇ 4rf) and the coater weighing hopper (Fig. ⁇ : ⁇ ), respectively; Tl ⁇ S stone and coke are simultaneously cut out at a specified ratio, and the conveyor (Fig. ⁇ Gffl can be performed by a conventionally known method such as a thigh to a ⁇ m breader 1 via a thigh.
  • the mixing ratio of the mixed raw material 20 in the HI bunker 1 cannot be changed locally.
  • the ore has an average diameter of 15 ⁇ fiber, while the coatas has an average of 50ramg ⁇ ; ⁇ , so when the mixed raw material 20 is introduced into the S bunker 1, However, the relatively large ⁇ coatas rolled in the direction of ⁇ bread force, and the ore with relatively small particle size was deposited at the ⁇ ⁇ position.
  • the mixed raw material 20 is poured into the bunker 1 ', the stone and coatas are mixed at a predetermined ratio in advance.
  • the coke mixing ratio is 3 ⁇ 41H ". That is, the ratio of ttU stones increases in the early stage of discharge, and the ratio of coatas in the discharge crane!] In this way, the mixed raw material 20 becomes ⁇ ! It is unavoidable that the mixing ratio ⁇ occurs when the water is discharged from the furnace.
  • the mixing ratio is reduced while the mixed raw material 20 is discharged from the m-punker 1. Therefore, when the mixed raw material 20 is introduced into the blast furnace 6 through the chute 5, the ore in the mixed raw material 20 is reduced. Ishizaki coatas are not evenly distributed on the raw material deposition surface 6, causing segregation in specific areas. Therefore, in the present invention 2, in order to prevent segregation on the raw material deposition surface 8, the mixing raw material 20, which is formed in a single TO panker 1, is started, and then, the * is ended. By then, the shot 5 is swiveled around the central axis of the blast furnace, and the driving angle ⁇ is sequentially changed at a force f, and To and from the blast furnace at least once. However, when changing the tilt angle ⁇ , turn the 5 shot 5 once at each tilt angle.
  • the tilt angle 0 is changed to increase the 3 ⁇ 4 ⁇ of the mixed raw material 20.
  • the 3 ⁇ 43 ⁇ 4 ⁇ chute 5 is reciprocated at least once in the half blast furnace direction until the ⁇ of the mixed raw material 20 in the pan 1 is completed. Therefore, the mixed raw material 20 is supplied to the arbitrary position on the raw material deposition surface 8 twice or more while the mixed raw material 20 in the single breader 1 is being supplied.
  • the tilt angle 0 of the chute 5 is usually set in several steps and each number (hereinafter referred to as a notch number) is assigned. Therefore, by turning the chute 5 once with the predetermined notch number to make the mixed raw material 20 and then changing to the next notch number and threading the ⁇ of the Kunli raw material 20 with the existing bell-less, Form 2 of ⁇ ⁇ ⁇ ⁇ can be formed in the blast furnace.
  • FIG. 5 is a schematic cross-sectional view of an example in which the mixed raw material is obtained by applying the second embodiment.
  • the mixed raw material 20 is started from the blast furnace wall side.
  • the mixed raw material 20 was supplied while gradually decreasing the tilt angle ⁇ , the mixed raw material 20 was applied to the center of the blast furnace, and then the mixed raw material 20 was reduced while increasing the tilt angle ⁇ . Therefore, in Fig.
  • the mixed raw material 20a formed in the m-punker 1 starts to be mixed with the mixed raw material 20 in the first turn (hereinafter, referred to as the first round) of the c3 ⁇ 4A chute 5, and
  • the mixed raw material 20b which was located on the blast furnace wall side on the raw material deposition surface 6 and was subjected to i ⁇ A in the twelfth rotation of the chute 5 (hereinafter referred to as the twelfth rotation), was subjected to the first rotation 13 ⁇ 43 ⁇ 4 ⁇ Place above mixing thickener 20a.
  • FIG. 5 shows a state in which the mixing of the mixed raw material 20 has been completed in the twelfth turn.
  • the chute 5 turns once around the blast furnace center axis at a predetermined tilt angle ⁇
  • the mixed raw material 20 is drawn on both sides of the blast furnace center axis as shown in the sectional view of FIG.
  • FIG. -Fig. 5 shows an example in which the shot 5 is turned 12 times while the mixed raw material 20 put in the bunker 1 is fed. In the Wei form 2, the shot 5 is turned.
  • the number is not limited to a specific number.
  • FIG. 5 shows that the shot 5 reciprocates once in the direction of the blast furnace while the mixed raw material 20 charged in the pan 1 is fed. It is sufficient that the gate 5 makes at least one round trip to the blast furnace ⁇ . Therefore ⁇ ! During the feeding of the difficult mixed raw material 20 ⁇ , the shot 5 may go back and forth once in the direction of the blast furnace, and may then go back and forth several times, or may go back and forth twice or more.
  • the number of times that SHUT 5 turns around the center axis of the blast furnace and the number of times SHUT 5 reciprocates in the direction of the blast furnace ⁇ during ⁇ is appropriate. Adjust the flow rate of 20 with the flow rate fiber gate 3.
  • Fig. 5 shows an example of starting the mixing of the mixed raw material 20 from the blast furnace wall side.However, the charging of the mixed raw material 20 was started from the blast furnace rule, and the tilt angle ⁇ was gradually increased. The mixed raw material 20 may be charged into the blast furnace wall while the mixed raw material 20 is charged while gradually decreasing the tilt angle ⁇ .
  • the mixed raw material 20 was placed at an arbitrary position on the raw material depositing surface 6 two or more times. Even if the mixing ratio of the mixed raw material 2'0 fluctuates (for example, the ore ratio increases), the behavior of the mixing ratio is reversed (for example, the coatas ratio increases) in the second and subsequent 3 ⁇ 4 ⁇ . Therefore, the ore and the coatas can be distributed on the raw material deposition surface 8 at a constant mixing ratio. As a result, it is possible to improve the air permeability of the difficult zone, suppress hot metal 1 and obtain hot metal of uniform quality.
  • raw materials such as ore and coke are formed from HI through a shell 5 to form a furnace sedimentary layer 14. .
  • the 3 ⁇ 4 ⁇ chute 5 is adjusted so as to have a tilt angle of 0 with respect to the furnace center axis at the furnace center 6a, and feeds the raw material while rotating around the furnace center axis. Then, a raw material deposit of Dotna is formed around the furnace center 6a.
  • the raw material to be used can be applied to any part of the S surface by changing the angle of the chute.
  • Adjustment of the 3 ⁇ 4 ⁇ position toward the furnace is performed by adjusting the tilt angle ⁇ of the shot 5. Normally, a notch is given to each of the predetermined angles in advance, and when the raw material is swirled (rotated) about the furnace central axis, the raw material starts to flow from the starting point. The notch number is determined for each turn of the Ute, and the pattern of the notch No. 9 is controlled to control the pattern of the raw material to the furnace.
  • the ⁇ : lower position of the raw material according to the tilt angle of the chute is investigated in advance when the raw material is filled in the furnace before the start of the blast furnace key.
  • the falling of the raw material is calculated dynamically to determine the position of the raw material. it can.
  • the fall position of the coatas is moved toward the center of the furnace, so that the fallen coat state flows into the slope from the fall position toward the furnace and is inserted.
  • the coarsest of the coats will accumulate in the center of the furnace.
  • the costas drop position should be moved closer to the center of the furnace. Therefore, all the coarse particles can enter the furnace center side, and this is the meaning of strengthening the segregation of the coarse coat at the furnace center.
  • the non-dimensional report that the center of the blast furnace is set to ⁇ ⁇ open and the center of the blast furnace is set to 0 and the furnace wall is set to 1 is set to 0.1 to 0.4. Is preferred.
  • the opening of the tree is larger than 0.4, the amount of coke separated by one turn will decrease even if the center coater starts ⁇ ⁇ . The effect of coarse-grained coke on the part is poor. Also,
  • the cox was turned in 5 turns.
  • the 3 ⁇ 4 ⁇ position was moved to the center of the furnace by 0.01 in a non-dimensional manner every turn, until the 3 ⁇ 4 ⁇ opening was set to 0.05 and 0.1 for the 3 ⁇ 4 ⁇ 81.
  • the 3 ⁇ 4 ⁇ position was moved in the furnace by 0.05 in a non-dimensional manner every turn.
  • the mesh of some f3 ⁇ 4 ⁇ f is set to, for example, 55 mm, which is larger than the mesh of the other shellfish ⁇ ft.
  • the amount of the coater 24a having a particle diameter of 55 mm or more is empirically estimated by the height of the weighing hopper 23.
  • the amount of one patch is preferably set to 5 to 5 0 mass 0/0. In less than 5 mass 0/0, since small large amount of coke of particle size of the furnace center portion Rere, Kotasu normal ⁇ the strength crowded Re furnace center portion 3 ⁇ 4, to form the central flow to a non-sufficient , 5 0 mass 0 / o by more than, although the stronger the central flow is sufficient, the increase of blast furnace ⁇ impossible for ij co one box amount occurs as undersize of Kotasu; because 3 ⁇ 4 case also occurs.
  • the amount of ⁇ was increased.
  • the working angle of the ttJf ⁇ A chute corresponds to the notch number as shown in Table 3 by ⁇ 1 ".
  • ⁇ increased the order in three levels (cases 1-3) of 1.8, 2.0 and 2.1 in the Kakar blast furnace. «: 1.8 and 2.
  • the dish of No. 0 was made with the raw material 3 ⁇ 4 ⁇ method, and the dish of 2.1 was made with the raw material relating to the present kiyoshi ⁇ .
  • Idegami-dani is a numerical value obtained by dividing one sunrise ffe * (t / d) of the blast furnace by the in-furnace fiber (m 3 ).
  • Table 1 shows the 3 ⁇ 4 ⁇ ⁇ cases of coke and ore in this ⁇ ⁇ (batch, ⁇ amount of patch, notch of shoot; pan force).
  • case 1 is a dish of mi.8, where only the coatas is
  • the amount of ore reduced per unit time is increased by increasing the amount to the blast furnace with the aim of increasing the output to 2.0 in order to increase the amount of solution.
  • the ratio of coals and pulverized coal are the amount of coke and coal coal (kg) converted to produce 1 t of hot metal .
  • the SS ratio is the mass ratio of ore, etc., extracted from iTO. It is a numerical value shown as 0 / 0.
  • the coax ⁇ ⁇ is the tumbler index.
  • the present invention is a.
  • the shot 5 is turned 12 times while turning!
  • the flow rate of the mixed raw material 20 discharged from the bunker 1 was reduced by using the low flow rate gate 3 so that the mixed raw material 20 in the bunker 1 was reduced.
  • 3 ⁇ 4 ⁇ is started from the blast furnace conversion (that is, the mixed raw material 20a made in the first swirl), and the mixed raw material 2 is gradually reduced while the working angle 0 is gradually reduced.
  • the mixed material 20 was added while the tilt angle ⁇ was gradually increased.
  • the bellless blast furnace that was racked up here is operated with the tilt angle 0 of the shot 5 set with the No. ⁇ symbol.
  • the correspondence between the notch number and the tilt angle ⁇ is the same as that shown in Table 3.
  • Table 5 shows the notch number settings when the mixed raw material 20 is ⁇ . Note that the notch number settings in Table 5 indicate that the vehicle turned once at each of the notch numbers with a force of 5 times s. For example, in the comparative example, the notch number "5" is described twice consecutively because the notch number "5" " ⁇ ⁇ Shoot 5 turns twice and then the next notch number" 6 "
  • the coke ratio, the pulverized coal ratio, the feed rate, the hot metal concentration, and the Si concentration in the hot metal were measured with a difficulty of 53 times.
  • the results are shown in Table 2.
  • the code in Table 4 The ratio of pulverized coal and pulverized coal is the ratio of the total amount of dragonfly and the total amount of pulverized ⁇ in the total output fiber for 5 days.
  • the blast, rn, and the Si concentration in the hot metal are the average values of the values measured (6 to 7 times / day). Variations in measured values are also shown for hot metal release and hot metal Si M ⁇ .
  • the 3 ⁇ 4 ⁇ chute was tilted at 0 ° and concentrated on the center of the furnace, corresponding to 3 ⁇ 4 ⁇ of the central coater.
  • the 3 ⁇ 4 ⁇ open; ⁇ standing was set to 0.3, and the central coke was moved by 0.03 for each turn without any change in the center of the furnace.
  • the gas inside the furnace at each position from the furnace wall to the center of the furnace was sampled while sending a sonde installed at a level 5 m below the HI deposition surface of the blast furnace shaft toward the furnace. Then, CO gas and co 2 gas were analyzed.
  • the gas utilization rate is a constant
  • Gas utilization rate (%) ⁇ co 2 a%) ⁇ / ⁇ co (w%) + co 2 (w%) ⁇ ⁇ ⁇ ⁇ ⁇ , where gas utilization rate is large in the blast furnace It can be considered that the ratio of ore becomes relatively large.
  • Figure 8 shows the calculation results of gas utilization rate.
  • the gas utilization rate at the central part of the furnace is higher than that of the surrounding area (up to 0.2% without any ⁇ ). This is because, as a result of the central coke being placed in the center of the furnace, the coarse particles in the coater penetrated into the periphery of the center of the furnace, and the furnace gas flow in this area was strengthened. It is probable that the ore stratification S collapsed and reached the furnace center.
  • the gas utilization rate at the center of the furnace was as low as 15%, and a strong: ⁇ gas flow was formed at the center of the furnace. And, because of the stable distribution of the water in the furnace, even if the TO ratio is reduced to 498 kgZt, the edible g equal to or more than that of the comparative example becomes edible g.
  • the horizontal axis in Fig. 11 indicates the amount of cortus discharged from the pan force ( ⁇ the 1 0 o o / 0 and the) at 0/0, the ratio of 5 5 m in clam one task the ordinate (%). From FIG. 11, it is clear that according to the present invention, the initial 3 ⁇ 4 ⁇ , that is, the amount of deposits in the center of the furnace becomes larger than that of the normal ⁇ method.
  • Difficult Mode 1 it is possible to always simultaneously mix the coke and the ore and the center of the koutus at the time of raising the height in the bellless blast furnace. As a result, it is possible to effectively prevent an increase in pressure iron in the furnace, which tends to occur when performing high ⁇ ⁇ , and to increase the shelf volume of mrn'ju iron and other high !? Increased production is possible.

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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)
  • Blast Furnaces (AREA)
  • Manufacture Of Iron (AREA)

Abstract

La présente invention concerne un procédé de chargement de matière brute pour creuset sans entonnoir de coulée, qui comprend une étape de stockage du coke dans au moins un réservoir supérieur du four, une étape de stockage du minerai dans au moins un réservoir supérieur du four, une étape de chargement du coke stocké avec variation simultanée de l'angle d'inclinaison d'une trémie d'un appareil de chargement sans entonnoir de coulée et avec rotation de cette trémie et, une étape de chargement du minerai stocké avec variation de l'angle d'inclinaison de la trémie de l'appareil de chargement sans entonnoir de coulée et avec rotation de cette trémie. La commande est exécutée de façon que l'évacuation du minerai stocké dans ce ou ces réservoirs supérieurs de four démarre lorsque la quantité d'évacuation du minerai stocké dans ces réservoirs est comprise entre 5% et 50% en masse d'une quantité de chargement de coke équivalent à une portion pour un lot. La matière brute mélangée, le mélange du minerai et du coke, est stocké dans un réservoir supérieur du four et est chargé dans un creuset alors qu'une trémie de chargement tourne et que l'angle d'inclinaison de cette trémie de chargement varie séquentiellement.
PCT/JP2003/010907 2002-08-29 2003-08-28 Procede de chargement de matiere brute pour creuset sans entonnoir de coulee WO2004027097A1 (fr)

Priority Applications (4)

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EP03797531A EP1445334A1 (fr) 2002-08-29 2003-08-28 Procede de chargement de matiere brute pour creuset sans entonnoir de coulee
KR1020047007960A KR100704691B1 (ko) 2002-08-29 2003-08-28 벨리스 고로의 원료 장입방법
CN038016575A CN1596315B (zh) 2002-08-29 2003-08-28 无料钟高炉的原料装入方法
BRPI0306185-0A BR0306185B1 (pt) 2002-08-29 2003-08-28 método para carregar um material em um alto forno sem sino tendo um dispositivo de carregamento sem sino.

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JP2002/250738 2002-08-29
JP2002250738A JP4045897B2 (ja) 2002-08-29 2002-08-29 ベルレス高炉の原料装入方法
JP2002/253432 2002-08-30
JP2002253432 2002-08-30

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CN113046502A (zh) * 2019-12-27 2021-06-29 山西建龙实业有限公司 一种大矿批循环矿复合料制的高炉冶炼方法
CN113174451A (zh) * 2021-04-15 2021-07-27 鞍钢股份有限公司 高炉炉料预装分布控制方法

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KR101118288B1 (ko) * 2004-11-19 2012-03-20 주식회사 포스코 고로의 원료장입 검출장치
CN101709340B (zh) * 2009-10-30 2012-05-09 宝钢集团新疆八一钢铁有限公司 应用于无钟高炉上的单罐串罐加料方法
JP5585729B2 (ja) * 2011-05-31 2014-09-10 新日鐵住金株式会社 高炉の原料装入装置およびそれを用いた原料装入方法
KR101564295B1 (ko) * 2012-05-17 2015-10-29 제이에프이 스틸 가부시키가이샤 고로로의 원료 장입 방법
CN104302784A (zh) * 2012-05-18 2015-01-21 杰富意钢铁株式会社 朝高炉装入原料的原料装入方法
EP2851437B1 (fr) * 2012-05-18 2018-10-03 JFE Steel Corporation Procédé pour le chargement de matière première dans un haut-fourneau
JP5601426B2 (ja) * 2012-05-18 2014-10-08 Ｊｆｅスチール株式会社 高炉への原料装入方法
WO2013179541A1 (fr) * 2012-05-28 2013-12-05 新日鐵住金株式会社 Procédé de chargement de matière première dans un haut-fourneau sans entonnoir de coulée
BR112014028858B1 (pt) * 2012-06-06 2018-11-13 Jfe Steel Corporation método para operação de alto-forno usando composto de ferro carbono
CN106249724B (zh) * 2016-09-14 2019-03-01 东北大学 一种高炉多元铁水质量预测控制方法及系统
CN111989411B (zh) * 2018-03-30 2022-07-08 杰富意钢铁株式会社 高炉的原料装入方法
JP7202860B2 (ja) * 2018-11-28 2023-01-12 株式会社Ｉｈｉポールワース 炉頂装置
CN109850421A (zh) * 2018-12-25 2019-06-07 北京联合荣大工程材料股份有限公司 一种可均化物料的分格式料仓装置及其使用方法
CN113186363A (zh) * 2021-04-14 2021-07-30 鞍钢股份有限公司 一种抑制高炉气流周期性波动的方法

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CN113046502A (zh) * 2019-12-27 2021-06-29 山西建龙实业有限公司 一种大矿批循环矿复合料制的高炉冶炼方法
CN113174451A (zh) * 2021-04-15 2021-07-27 鞍钢股份有限公司 高炉炉料预装分布控制方法

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BR0306185A (pt) 2004-10-19
CN1596315B (zh) 2011-03-23
CN1596315A (zh) 2005-03-16
KR100704691B1 (ko) 2007-04-10
EP1445334A1 (fr) 2004-08-11

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