EP1445334A1 - Rohstoffbeschickungsverfahren für glockenlosen hochofen - Google Patents

Rohstoffbeschickungsverfahren für glockenlosen hochofen Download PDF

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Publication number
EP1445334A1
EP1445334A1 EP03797531A EP03797531A EP1445334A1 EP 1445334 A1 EP1445334 A1 EP 1445334A1 EP 03797531 A EP03797531 A EP 03797531A EP 03797531 A EP03797531 A EP 03797531A EP 1445334 A1 EP1445334 A1 EP 1445334A1
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EP
European Patent Office
Prior art keywords
coke
furnace
charging
bell
ore
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP03797531A
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English (en)
French (fr)
Inventor
Hirofumi c/o Intellectual Prop. Dept. NISHIMURA
Shigeaki c/o Intellectual Property Dept. GOTO
Nozomu c/o Intellectual Property Dept. NISHIMURA
Hideyuki c/o Intellectual Property Dept. KAMANO
Shinji c/o Intellectual Property Dept. HASEGAWA
Shin'ichiro c/o Intellectual Property Dep YAMANA
Masanori c/o Intellectual Property Dep TAKESHITA
Shiro c/o Intellectual Property Dept. WATAKABE
Takeshi c/o Intellectual Property Dept. ITO
Hideo c/o Intellectual Property Dept. FUJIMOTO
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JFE Steel Corp
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JFE Steel Corp
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Filing date
Publication date
Priority claimed from JP2002250738A external-priority patent/JP4045897B2/ja
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP1445334A1 publication Critical patent/EP1445334A1/de
Withdrawn legal-status Critical Current

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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 method for charging material into a blast furnace, in particular, a method for charging iron ore and coke into a blast furnace by use of a bell-less charging device.
  • iron ores and coke are alternately charged, and thereby in an upper furnace part (hereinafter, referred to as shaft) a charged layer having a layer structure thereof is formed.
  • Amounts of one layer of iron ores and one layer of coke are called one charge of iron ores and one charge of coke, respectively.
  • Each of the one charge of iron ores and one charge of coke is not necessarily charged at one time into the furnace and, in some cases, is charged into the furnace divided into a plurality of times.
  • the divided ores and divided coke are respectively called as one batch of ores and one batch of coke.
  • Japanese Patent No.2820478 discloses a method in which by devising discharging timings and amounts of ore and coke from an ore hopper and a coke hopper, in a bell-less blast furnace, the coke is uniformly mixed in the ore.
  • JP-A No.60-56003 discloses a technology in which from 1.5 to 8% by weight of coke that is charged in one charge is intensively charged in the center part of a furnace.
  • the center charge of coke has not only an effect of reducing the permeability resistance in the furnace but also an effect of avoiding or reducing the deterioration of coke due to so-called solution loss reaction in which, since ore is not so much present in the center part of the furnace, carbon dioxide generated by the reduction of ore oxidizes coke. Furthermore, a strength control value of the coke itself can be lowered and thereby enabling to use cheap and low quality coal; accordingly, material coal for the manufacture of coke can be reduced in cost.
  • the discharge from a material hopper has to be carried out divided in three batches of a batch for normal charge of coke, a batch for center charge of coke and a batch for mix charge.
  • a third object is to provide a material charging method of a bell-less blast furnace. According to the method, in center coke charge that uses a charging chute in a bell-less blast furnace, a particle diameter of coke is made largest at the furnace center part, thereby a gas flow in a furnace is formed at a furnace center part, and thereby a stable operation is enabled.
  • a fourth object is to provide a material charging method of a bell-less blast furnace. According to the method, without separately disposing a charging device exclusive for coke and without increasing the number of batches of material, coke larger in the particle diameter than one being charged in a peripheral part can be selectively charged in a center part of the blast furnace.
  • the invention provides a method of charging material in a bell-less blast furnace that is provided with a bell-less charging device, the method comprising the steps of:
  • the invention provides a method of charging material in a bell-less blast furnace that is provided with a bell-less charging device, the method comprising the steps of:
  • the invention provides a method of charging material in a bell-less blast furnace that is provided with a bell-less charging device, the method comprising the steps of:
  • the invention provides a method of charging material in a bell-less blast furnace provided with a bell-less charging device, the method including a coke screening step where coke stored in at least two coke bins is discharged and the discharged coke is sifted with a screen disposed at a lower part of the bin; a weighing and storing step where coke of plus screen is weighed with a weighing hopper and stored in a bunker disposed at a furnace top; and a charging step where stored coke is charged through a chute of the bell-less charging device in a blast furnace while rotating the chute from a furnace center part toward a furnace wall side.
  • the coke screening step includes a first screening step where the coke discharged with a screen having a larger screen mesh (A) is sifted; and a second screening step where the coke discharged with a screen having a more finer screen mesh (B) is sifted.
  • A screen having a larger screen mesh
  • B screen having a more finer screen mesh
  • the invention provides a material charging method of a bell-less blast furnace.
  • an amount of coke from the first screening step that sifts the coke that is discharged with a screen having a larger screen mesh (A) is in the range of 5 to 50% by mass of an amount of coke of the batch.
  • the invention provides a material charging method of a bell-less blast furnace provided with a bell-less charging device, the method comprising the steps of:
  • the invention is a method of charging material in a bell-less blast furnace (embodiment 1), the method being characterized in that when a chute of a bell-less charging device of a blast furnace is rotated with a inclination angle thereof varying and thereby coke or ore stored in a plurality of furnace top bunkers is charged from a furnace center part toward a furnace wall part in a radius direction in the furnace, from a predetermined time point where a discharge amount of coke stored in one of the furnace top bunkers is between 5 to 50% by mass of a coke charge amount for one batch, ore stored in another furnace top bunker is started to discharge, and thereby the coke and ore are simultaneously charged.
  • the chute of the bell-less charging device of a blast furnace is rotated with a inclination angle thereof increasing sequentially and stepwise from zero that is a vertical state; when a discharge amount of coke stored in one of furnace top bunkers becomes in the range of 5 to 50% by mass of a coke charge amount for one batch, discharge of ore stored in another furnace top bunker is begun; and thereby the coke and ore are simultaneously charged. Accordingly, in the neighborhood of the furnace center part only the coke is filled; and on a furnace wall side in the surroundings thereof, a mixture of the coke and ore is filled. As a result, the mix charge of the coke and ore, without interrupting owing to the transporting capacity of material of the furnace top, can be always smoothly carried out.
  • the present invention is a method of charging material in a bell-less blast furnace (hereinafter referred to as embodiment 2), the method, in a material charging method of a bell-less blast furnace where by use of a bell-less charging device ore and coke as material are charged in a blast furnace, being characterized in that a mixed material obtained by mixing ore and coke is stored in one of furnace top bunkers; and, by rotating a charging chute about a blast furnace neutral axis and sequentially varying a inclination angle of the charging chute, during at least one reciprocation of the charging chute in a radius direction in the blast furnace, the whole amount of the mixed material stored in the furnace top bunker is charged in the blast furnace.
  • the charging chute preferably starts charging the mixed material either from a furnace wall side of the blast furnace or from a blast furnace center side.
  • the invention is a material charging method of a bell-less blast furnace (hereinafter referred to as embodiment 3), the method, in a material charging method of a bell-less blast furnace in which ore and/or coke is charged in a blast furnace as material by use of a bell-less charging device, being characterized in that when coke is charged in the center part of the bell-less blast furnace by use of a charging chute, with respect to a dimensionless radius where a furnace center part of the bell-less blast furnace is assigned to zero and a furnace wall part to 1, from a radius position corresponding to 0.1 to 0.4, the coke is begun charging followed by continuing charging while sequentially moving an inclination angle of the charging chute toward a furnace center side for each rotation thereof.
  • the invention is a material charging method of a bell-less blast furnace (hereinafter referred to as embodiment 4), the method being characterized in that when coke stored in a plurality of coke bins is discharged and sifted with a screen disposed at a lower part of each of the bins and coke above the screen is charged sequentially through a weighing hopper, a bunker disposed at the furnace top and a chute of a bell-less charging device into a blast furnace with the chute rotating from a furnace center part toward a furnace wall side, when screen mesh of screens disposed at lower parts of some of the coke bins is made larger than that of the other coke bins and the coke is transferred from these coke bins to the weighing hopper, after, firstly, a predetermined amount of the coke from the coke bins large in the screen mesh is transferred to the weighing hopper, subsequently the coke from the other coke bins is transferred followed by weighing the coke for one batch further followed by charging through the bunker into a blast
  • an amount of coke from the coke bins large in the screen mesh is preferably in the range of 5 to 50% by mass relative to the whole amount of coke of the batch (hereinafter referred to as embodiment 5).
  • embodiments 1 through 5 in a material charging method of a bell-less blast furnace (hereinafter referred to as embodiment 6), at least three of the furnace top bunkers are disposed in parallel.
  • a longitudinal sectional view of a furnace top part of a blast furnace provided with a bell-less charging device is shown in Fig.1.
  • Material 2 (ore or coke) stored in a furnace top bunker 1 falls through a gate that is called a flow rate control gate 3 and controls a discharge amount with an opening thereof and is supplied through a vertical chute 4 into a chute that can freely rotate (usually called a charging chute 5).
  • the charging chute 5 can rotate in a horizontal direction about a neutral axis 7 of a blast furnace 6 and can alter a inclination angle ( ⁇ ) thereof relative to the neutral axis 7.
  • the material can be charged in the furnace with a wide pile surface formed.
  • the inclination angle ⁇ a large number of angles are previously set and notch numbers are assigned to the respective angles.
  • the same kind of material can be always charged at a constant position.
  • the furnace top bunker 1 two of 1a and 1b are shown in Fig.1; however, there are cases of three or more, and in each thereof material 2 for one batch can be transported and stored.
  • Embodiment 1 is a blast furnace material charging method that uses such bell-less charging device, in the method, coke is charged with a inclination angle sequentially varying from a furnace center side toward a furnace wall side, and, during the charge of the coke, also ore is simultaneously charged.
  • charge periods of ore and coke are as that shown in a conceptual diagram shown in Fig.2A.
  • coke is discharged from a furnace top bunker (for instance, 1a) where the coke is stored, and when a discharge amount of the coke from the furnace top bunker becomes 5 to 50% by mass of a coke charge amount for one batch stored in the furnace top bunker, from another furnace top bunker (for instance, 1b) where ore is stored the ore is begun discharging. Thereby, at the beginning, the center charge of coke, and, halfway on, the mix charge of coke and ore can be performed.
  • Fig.3 shows a case where after firstly three rotations are carried out to charge coke, the mix charge of coke and ore is carried out. In this case, immediately after the coke charge, only the coke is charged on a furnace center side; accordingly, a deposit layer C 2 made only of coke is formed in the furnace center part. Thereafter, ore is charged together with the coke; accordingly, a mixed layer C 2 + O 1 of the coke and ore is formed.
  • the coke charged in advance piles up in heap in the furnace center part, and thereafter a mixture of the coke and ore is charged to a more furnace wall side than that; accordingly, the mixture later charged does not flow on the heap of the coke in the furnace center part.
  • a center coke layer where only coke piles up is formed.
  • the opening of the flow rate control gate 3 is preferably controlled so that the respective discharges of coke and ore may come to completion simultaneously.
  • the opening control of the flow rate control gate 3 may be appropriately carried out.
  • coke and ore are respectively divided into two batches, a second batch of the coke and a first batch of the ore are partially simultaneously discharged, and thereby the center coke and the mixed layer are formed.
  • a charging method in which a layer of coke alone is formed in the furnace center part and in the surroundings thereof a mixed layer is formed may be adopted.
  • a charging method where coke is divided into two batches, one batch of coke alone C 1 is charged over an entirety in the furnace, and thereafter from halfway of the second batch of the coke, ore for one charge is mixed and charged can be adopted.
  • a timing of starting discharging ore that is mixed with coke from the furnace top bunker is set at during a period from a time when the discharge of coke alone from another furnace top bunker is started to a time when coke corresponding to 5 to 50% by mass of an amount of coke that is charged in the batch is discharged.
  • Fig.4 is a sectional view schematically showing a furnace top part of a blast furnace (hereinafter, referred to as bell-less blast furnace) provided with a bell-less charging device.
  • a blast furnace neutral axis and a rotation chute form hereinafter referred to as inclination angle
  • a bell-less blast furnace is provided with two or more furnace top bunkers 1, and in one of the furnace top bunkers 1 a mixed material 20 obtained by mixing coke and ore is stored.
  • the mixed material 20 is discharged from a lower part of the furnace top bunker 1, controlled to a predetermined flow rate when passing through a flow rate control gate 3, and thereafter supplied through a vertical chute 4 to a charging chute 5.
  • the mixed material 20 When the mixed material 20 is thus charged into the blast furnace 6, by rotating the charging chute 5 and sequentially varying the inclination angle ⁇ , over a wide range on a material pile surface 8 at a furnace top part of a blast furnace 7, the mixed material 20 can be charged.
  • a bell-less blast furnace provided with two furnace top bunkers 1 is shown; however, embodiment 2 can be applied also to a bell-less blast furnace provided with three or more furnace top bunkers 1.
  • a method of storing the mixed material 20 of ore and coke in the furnace top bunker 1 is not restricted to a particular method.
  • a so far known method in which from a weighing hopper of ore (not shown in the drawing) and a weighing hopper of coke (not shown in the drawing), respectively, ore and coke are simultaneously discharged at a predetermined ratio and transferred through charge conveyers (not shown in the drawing) to the furnace top bunker 1 can be used.
  • the mixed material 20 in the furnace top bunker 1 cannot be avoided from locally varying in the mixing ratio. That is, while an average particle diameter of ore is such small as substantially 15 mm, an average particle diameter of coke is such large as substantially 50 mm; accordingly, when the mixed material 20 is thrown into the furnace top bunker 1, coke relatively large in the particle diameter rolls toward a wall side of the furnace top bunker 1 and ore relatively small in the particle diameter tends to pile up at a position where it is thrown in.
  • the mixed material 20 when the mixed material 20 is discharged from a lower part of the furnace top bunker 1, of the mixed material 20 stored in the furnace top bunker 1, the mixed material 20 distributed in a vertical direction from a lower layer part positioned immediately above a discharge outlet to a surface part is predominantly discharged, on a portion immediately above the discharge outlet where a pile level is lowered, the mixed material 20 flows in from the surroundings thereof (so-called funnel flow), and thereby the discharge proceeds.
  • the charging chute 5 in order to inhibit the segregation on the material pile surface 8 from occurring, during from the start of the charge of the mixed material 20 stored in one furnace top bunker 1 to the completion of the charge of the whole amount thereof, the charging chute 5 is rotated about the blast furnace neutral axis and the inclination angle ⁇ is sequentially varied, and thereby the charging chute 5 is reciprocated at least once in a radius direction in the furnace.
  • the inclination angle ⁇ is varied, at each of the inclination angles the charging chute 5 is rotated once.
  • the charging chute 5 is rotated once about the blast furnace neutral axis to charge the mixed material 20, thereafter the inclination angle ⁇ is varied and the mixed material 20 is charged. This is repeated until the charge of the whole amount of the mixed material 20 in the furnace top bunker 1 comes to completion, and, during this period, the charging chute 5 is reciprocated at least once in a radius direction in the blast furnace. Accordingly, during the charge of the whole amount of the mixed material 20 stored in one furnace top bunker 1, on an arbitrary position on the material pile surface 8, the mixed material 20 is charged twice or more.
  • the inclination angle ⁇ of the charging chute 5 is set at several steps and each of the steps is assigned to a number (hereinafter referred to as notch number). Accordingly, after the charging chute 5 is rotated once at a predetermined notch number and the mixed material 20 is charged, the notch number is changed to the subsequent notch number followed by continuing the charge of the mixed material 20, and thereby the embodiment 2 can be applied to an existing bell-less blast furnace.
  • Fig.5 is a sectional view schematically showing an example where the embodiment 2 is applied to charge a mixed material.
  • Fig.5 an example in which the charge of the mixed material 20 is begun from a furnace wall side, the mixed material 20 is continued charging with the inclination angle ⁇ sequentially reducing, and, after the mixed material 20 is charged in the center part of the blast furnace, the mixed material 20 is charged with the inclination angle ⁇ sequentially increasing is shown.
  • a mixed material 20a that was charged at the first rotation (hereinafter referred to as the first rotation) of the charging chute 5 that began charging the mixed material 20 stored in the furnace top bunker 1 locates on a blast furnace wall side on a material pile surface 6, and a mixed material 20b charged at the twelfth rotation (hereinafter referred to as the twelfth rotation) of the charging chute 5 locates on the mixed material 20a charged at the first rotation.
  • Fig.5 shows a state when the charge of the whole amount of the mixed material 20 came to completion at the twelfth rotation.
  • the charging chute 5 rotates once at a predetermined inclination angle 0 about the blast furnace neutral axis; accordingly, in Fig.5, the mixed material 20 is charged on both sides of the blast furnace neutral axis. However, in Fig.5, only one side is shown.
  • Fig.5 an example in which while the whole amount of the mixed material 20 stored in the furnace top bunker 1 is charged, the charging chute 5 is rotated twelve times is shown; however, in the embodiment 2, the number of rotation of the charging chute 5 is not restricted to a particular numerical value.
  • Fig.5 an example in which while the whole amount of the mixed material 20 stored in the furnace top bunker 1 is charged, the charging chute 5 reciprocates once in a radius direction in the blast furnace is shown; in the embodiment 2, the charging chute 5 need only reciprocate at least once in a radius direction of the blast furnace. Accordingly, while the whole amount of the mixed material 20 stored in the furnace top bunker 1 is charged, the charging chute 5, after one reciprocation in a radius direction of the blast furnace, may rotate further several times, or may reciprocate tow or more times.
  • the number of times of rotations of the charging chute 5 about a blast furnace neutral axis and the number of times of reciprocations of the charging chute 5 in a radius direction of the blast furnace may be appropriately set.
  • the flow rate of the mixed material 20 discharged from the furnace top bunker 1 is controlled with the flow rate control gate 3.
  • Fig.5 an example where the charge of the mixed material 20 is started from a blast furnace wall side is shown.
  • the charge of the mixed material 20 may be started from the blast furnace center side and continued with the inclination angle ⁇ sequentially increasing, and, after the mixed material 20 is charged on the blast furnace wall part, the mixed material 20 may be charged with the inclination angle ⁇ sequentially diminishing.
  • the mixed material 20 When, during the whole amount of the mixed material 20 stored in the furnace top bunker 1 being thus charged, the mixed material 20 is charged twice or more on an arbitrary position on the material pile surface 6, even when the mixing ratio of the mixed material 20 at the first charge varies (an increase in the ratio of, for instance, ore), in the charge at second time and after, the mixing ratio exhibits a reverse behavior (an increase in the ratio of, for instance, coke). Accordingly, the ore and coke can be distributed on the material pile surface 8 with a definite mixing ratio. As a result, the gas permeability of a cohesive zone can be improved, a temperature fluctuation of the hot pig iron can be inhibited from occurring, and thereby the hot pig iron having uniform quality can be obtained.
  • the mixed material 20 piles up on the material pile surface 8 spreading in a radius direction; accordingly, when the charging chute 5 is reciprocated in a radius direction, there is no need of reciprocating at the same notch number.
  • the charging chute 5 need only reciprocate at least once.
  • a bell-less blast furnace 6 that has a charging chute 5
  • material such as ore and coke is charged from a furnace top through a charging chute 5, and thereby a burden distribution in the furnace 14 is formed.
  • the charging chute 5 is controlled so as to be ⁇ in the inclination angle with respect to the furnace neutral axis in a furnace center part 6a and charges the material while rotating about the furnace neutral axis. Thereby, a material deposit surface having the point symmetry with the furnace center part 6a as a center is formed. Furthermore, the material being charged, when an angle of the charging chute is varied, can be put on an arbitrary position on a furnace top surface.
  • a charge position in a radius direction in the furnace can be controlled by controlling the inclination angle ⁇ of the charging chute 5.
  • corresponding notch numbers are assigned to predetermined inclination angles.
  • the notch number is previously determined for each rotation of the charging chute from the charge start of the material.
  • Falling positions of the material corresponding to the inclination angles of the charging chute are previously investigated when prior to the start of operation of a blast furnace material filling in the furnace is investigated.
  • a charging position of the material can be obtained.
  • the charge start position of the center coke is preferably set at a radius position corresponding to 0.1 to 0.4 relative to a dimensionless radius with the furnace center part of the blast furnace assigned to 0 and the furnace wall part assigned to 1.
  • the charge start position is larger than 0.4, since when the charge of the center coke is begun, an amount of coke charged by one rotation becomes slight, the coke does not flow in the neighborhood of the furnace center part, resulting in less effective in the effect of charging coarser particles in the furnace center part.
  • the charge start position is less than 0.1, since a distance through which the charged coke flows in becomes short, the effect of causing the particle segregation becomes less.
  • the coarse coke particle ratio is defined as follows. That is, after the charge experiment was over, at each of the respective dimensionless radius positions, a predetermined amount was sampled and a particle size distribution of the coke was measured, and, with particles having particle diameter larger than a median diameter of the charged coke as coarse particles, a ratio of the coarse particles in each of the samples is obtained as the coarse coke particle ratio.
  • the coke was charged by 5 rotations.
  • the charge start positions being 0.05 and 0.1, after one rotation, the charge position was moved toward the furnace center side by 0.01 in terms of dimensionless radius to charge.
  • the charge start position being 0.4 and 0.45, after one rotation, the charge position was moved toward the furnace center side by 0.05 in terms of the dimensionless radius to charge.
  • the coarse coke particle ratio does not so much vary, resulting in there being no large segregation.
  • 70% or more of the coke becomes coarse particles; that is, it is found that the segregation of the coarse particles in the neighborhood of the center part is intensified.
  • a screen 21 is disposed, and a screen mesh thereof is set at 35 mm.
  • the screen mesh of part of the coke bins is set at for instance 55 mm that is larger than that of the other coke bins.
  • the coke is discharged from a lower part of the hopper 3 and transferred to a bunker 1 at the furnace top. Even at this time, in the bunker 1, similarly to the above, on a lower side, the coke 24a having a particle diameter of 55 mm or more, thereon the coke 24b having a particle diameter of 35 mm or more, in total for one batch of coke, are piled.
  • the particle diameter of the coke piled up in the blast furnace becomes larger in average in the center part than in the periphery part.
  • an amount of the coke 24a that has a particle diameter of 55 mm or more is empirically inferred from a pile height in the weighing hopper 23. Furthermore, an amount thereof in one batch is preferably in the range of 5 to 50% by mass. When it is less than 5% by mass, since an amount of the coke that has a larger particle diameter is less in the furnace center part, it is insufficient for coke having an ordinary particle diameter to flow in the furnace center part to form a strong center flow. On the other hand, when it is more than 50% by mass, although it is sufficient to form a strong center flow, an amount of coke of minus screen that cannot be used increases, resulting in causing inconvenience.
  • the present invention exhibits effects in each of the above-explained embodiments 1 through 5. However, when these are combined, the distribution of the charge in the blast furnace can be more effectively optimized.
  • the embodiment 4 can be applied to the C 1 layer; the embodiment 3 to the C 2 layer; the embodiment 1 to the C 2 + O 1 layer; and the embodiment 2 to the O 2 layer.
  • the inclination angles of the charging chute correspond to the notch numbers. The larger the notch number is, the smaller is set the inclination angle. Accordingly, immediately after the start of the charge, the charging chute is at 20th notch and in an almost vertical state, thereafter, with the inclination angle gradually increasing, the charge is carried out.
  • case 2 An operation situation of case 2 is shown in Table 2. Although, in order to improve the productivity, the mix charge of case 1 was given up and the agglomerated ore ratio was raised, the permeability resistance index in the furnace rose from 1.05 to 1.17, that is, the gas permeability was more deteriorated than the case 1.
  • the coke ratio and pulverized coal ratio denote amounts (kg) of coke and pulverized coal used to produce 1 ton of molten iron.
  • the agglomerated ore ratio is a numeral value that shows a mass ratio of sintered ore in ore and so on that are charged from the furnace top in terms of percentage.
  • the coke strength TI is a tumbler index.
  • the permeability resistance index can be expressed with the following equation.
  • a mixed material 20 in which coke is mixed in ore in advance was stored in one of furnace top bunkers 1.
  • An amount of coke in the mixed material 20 was set at 16% by mass with respect to an amount of total coke for one cycle of the ore layer and coke layer.
  • a flow rate of the mixed material 20 that is discharged from the furnace top bunker 1 was adjusted with a flow rate control gate 3. That is, as shown in Fig. 5, the charge was begun from a blast furnace wall side (that is, the mixed material 20a charged at the first rotation) , the mixed material 2 was charged with a inclination angle ⁇ sequentially diminishing, after the mixed material 20 was charged up to a predetermined inclination angle in a blast furnace center direction, with the inclination angle ⁇ sequentially increasing the mixed material 20 was charged.
  • the charging chute 5 reciprocated once in the radius direction in the blast furnace followed by charging again on the blast furnace wall side (that is, the mixed material 20b charged at the twelfth rotation) , and thereby the charge of the whole amount of the mixed material 20 in the furnace top bunker 1 came to completion.
  • a flow rate control gate 3 was controlled so that the whole amount of the mixed material 20 in the furnace top bunker 1 may be charged during twelve rotations of the charging chute 5. The charge was begun from a blast furnace wall side, the mixed material 20 was charged with a inclination angle ⁇ sequentially diminishing, and the charge of the whole amount of the mixed material 20 in the furnace top bunker 1 came to completion on the furnace center side.
  • the bell-less blast furnace used here is operated with the inclination angle ⁇ of the charging chute 5 set with the notch number.
  • the correspondence between the notch numbers and the inclination angles ⁇ 's is the same as that shown in Table 3.
  • the setting of the notch numbers when the mixed material 20 was charged is shown in Table 5.
  • the setting of the notch numbers in Table 5 denotes that the charging chute 5 made one rotation at each of the notch numbers. For instance, in the comparative example, the notch number [5] is written consecutively twice. This means that after the charging chute 5 was rotated twice at the notch number [5] , the charging chute 5 was rotated at the subsequent notch number [6].
  • the coke layer is formed, in both the inventive example and the comparative example, an amount corresponding to 10% by mass relative to the whole amount of coke for one cycle was charged to the blast furnace center part (so-called center coke), and remaining coke is evenly charged in a radius direction in the blast furnace. That is, the charge sequence was three-batch charge of coke-coke-ore (mixed material 20).
  • the inventive example and the comparative example, respectively, were operated for 5 days, and the coke ratio, pulverized coal ratio, blast temperature, hot metal temperature, and tap Si concentration were measured. Results thereof are shown together in Table 2.
  • the coke ratio and the pulverized coal ratio in Table 4, respectively, are ratios of a total amount of used coke and a total amount of used pulverized coal to a total tapping amount of molten iron for 5 days.
  • the blast temperature, hot metal temperature and Si concentration in the molten iron are average values of measurements obtained by periodically measuring (6 to 7 times a day). For the hot metal temperature and Si concentration in the molten iron, the dispersions of the measurements are also shown.
  • the dispersions of the hot metal temperatures and Si concentrations in the molten iron were reduced in comparison with that of the comparative examples. Accordingly, in the inventive example, even when the blast temperature was lowered by 30 degree centigrade in comparison with the comparative example, the stable operation was performed with the equivalent hot metal temperature maintained.
  • the gas utilization efficiency at the furnace center part is higher than that in the periphery thereof (up to a position of substantially 0.2 in terms of dimensionless radius). This is considered that as a result of the center coke being charged concentrated at the furnace center part, coarser particles in the coke flowed in the periphery part of the furnace center, thereby the gas flow in the furnace in this part was intensified and ore charged in this part was blown up, and thereby an ore layer was collapsed and flowed in the furnace center part.
  • the gas utilization efficiency at the furnace center part is such low as substantially 15%, a strong gas flow is formed in the furnace center part. Owing to the charge in the furnace being stably distributed, even when the fuel ratio is lowered to substantially 498 kg/t (molten iron) , the production the same as that of comparative example or more can be achieved.
  • a horizontal axis shows an amount of coke discharged from a bunker in terms of % (a total amount is assigned to 100 %) and a vertical axis shows a ratio (%) of 55 or more in a sampled coke. From Fig.11, it is obvious that according to the present invention, a particle diameter of coke that piles up in the early stage of the charge, that is, in the furnace center part becomes larger in comparison with that of the conventional charging method.
  • the mix charge of coke and ore and the center charge of coke can be simultaneously carried out.
  • an increase in the pressure loss in the furnace that is likely to occur when the operation of high production amount is carried out can be effectively inhibited from occurring, and thereby without increasing an amount used of high quality materials such as sintered ore and reduced iron, the molten iron can be increased in amount of production.
  • the ore and coke can be distributed with a constant mixing ratio, and thereby the hot metal temperature and the quality of molten iron can be inhibited from fluctuating.
  • a particle diameter of coke could be made the largest at the furnace center part, and thereby a stable operation could be realized. Furthermore, at lower fuel ratios the production the same as ever or more could be achieved, that is, more favorable blast furnace operation could be realized.

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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)
EP03797531A 2002-08-29 2003-08-28 Rohstoffbeschickungsverfahren für glockenlosen hochofen Withdrawn EP1445334A1 (de)

Applications Claiming Priority (5)

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JP2002250738 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
JP2002253432 2002-08-30
JP2002253432 2002-08-30
PCT/JP2003/010907 WO2004027097A1 (ja) 2002-08-29 2003-08-28 ベルレス高炉の原料装入方法

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EP2840152A4 (de) * 2012-06-06 2015-11-18 Jfe Steel Corp Betriebsverfahren für einen verbrennungsofen mit ferrocoke
EP2851434A4 (de) * 2012-05-18 2015-12-09 Jfe Steel Corp Verfahren zum laden eines rohmaterials in einen hochofen
EP2851437A4 (de) * 2012-05-18 2015-12-16 Jfe Steel Corp Verfahren zum laden eines rohmaterials in einen hochofen
EP2851435A4 (de) * 2012-05-18 2015-12-30 Jfe Steel Corp Verfahren zum laden eines ausgangsmaterials in einen hochofen
CN106249724A (zh) * 2016-09-14 2016-12-21 东北大学 一种高炉多元铁水质量预测控制方法及系统
US11680748B2 (en) 2018-03-30 2023-06-20 Jfe Steel Corporation Method for charging raw materials into blast furnace

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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
JP5522331B2 (ja) * 2012-05-17 2014-06-18 Ｊｆｅスチール株式会社 高炉への原料装入方法
IN2014DN10251A (de) * 2012-05-28 2015-08-07 Nippon Steel & Sumitomo Metal Corp
JP7202860B2 (ja) * 2018-11-28 2023-01-12 株式会社Ｉｈｉポールワース 炉頂装置
CN109850421B (zh) * 2018-12-25 2024-10-11 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
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
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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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Cited By (6)

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Publication number Priority date Publication date Assignee Title
EP2851434A4 (de) * 2012-05-18 2015-12-09 Jfe Steel Corp Verfahren zum laden eines rohmaterials in einen hochofen
EP2851437A4 (de) * 2012-05-18 2015-12-16 Jfe Steel Corp Verfahren zum laden eines rohmaterials in einen hochofen
EP2851435A4 (de) * 2012-05-18 2015-12-30 Jfe Steel Corp Verfahren zum laden eines ausgangsmaterials in einen hochofen
EP2840152A4 (de) * 2012-06-06 2015-11-18 Jfe Steel Corp Betriebsverfahren für einen verbrennungsofen mit ferrocoke
CN106249724A (zh) * 2016-09-14 2016-12-21 东北大学 一种高炉多元铁水质量预测控制方法及系统
US11680748B2 (en) 2018-03-30 2023-06-20 Jfe Steel Corporation Method for charging raw materials into blast furnace

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TW200404898A (en) 2004-04-01
BR0306185A (pt) 2004-10-19
CN1596315A (zh) 2005-03-16
KR100704691B1 (ko) 2007-04-10
CN1596315B (zh) 2011-03-23
KR20040058021A (ko) 2004-07-02
TWI239355B (en) 2005-09-11
BR0306185B1 (pt) 2011-08-23

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