WO2011040425A1 - 高炉朝顔部構造およびその設計方法 - Google Patents

高炉朝顔部構造およびその設計方法 Download PDF

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Publication number
WO2011040425A1
WO2011040425A1 PCT/JP2010/066879 JP2010066879W WO2011040425A1 WO 2011040425 A1 WO2011040425 A1 WO 2011040425A1 JP 2010066879 W JP2010066879 W JP 2010066879W WO 2011040425 A1 WO2011040425 A1 WO 2011040425A1
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Prior art keywords
morning glory
blast furnace
furnace
stave
tuyere
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PCT/JP2010/066879
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English (en)
French (fr)
Japanese (ja)
Inventor
邦義 阿南
俊之 中馬
芳幸 松岡
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新日本製鐵株式会社
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Application filed by 新日本製鐵株式会社 filed Critical 新日本製鐵株式会社
Priority to BR112012007569A priority Critical patent/BR112012007569A2/pt
Priority to JP2010550385A priority patent/JP4757960B2/ja
Priority to KR1020127007772A priority patent/KR101334479B1/ko
Priority to CN201080042957.2A priority patent/CN102575303B/zh
Priority to IN2717DEN2012 priority patent/IN2012DN02717A/en
Publication of WO2011040425A1 publication Critical patent/WO2011040425A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/10—Cooling; Devices therefor

Definitions

  • the present invention relates to a blast furnace morning glory structure and a design method thereof.
  • This application claims priority based on Japanese Patent Application No. 2009-224434 filed in Japan on September 29, 2009, the contents of which are incorporated herein by reference.
  • the morning glory portion of a blast furnace has an iron skin, a cooling stave (hereinafter simply referred to as a stave) provided inside the iron skin, and a refractory brick provided inside the stave to protect the stave. It is equipped with.
  • a castable or the like is appropriately filled between the iron skin and the stave.
  • the period of stable blast furnace operation continues. This is considered to be because most of the refractory bricks disappear, and a substantially appropriate profile or circumferential balance close to the initial stage of firing is obtained by the deposit layer generated on the surface of the stave furnace. From the blast furnace firing to the stable operation period, most of the refractory bricks installed inside the blast furnace disappear due to thermal shock and wear. However, it is considered that a deposit layer due to the charge is generated on the stave surface inside the furnace, and this deposit layer compensates for a worn part of the inner surface of the furnace (cell flying effect).
  • the inside surfaces of the morning glory and the belly of the furnace have a high-temperature cohesive zone (softening and melting of the ore in the charge begins, and the ores in the semi-molten state are fused together to form a plate. Because it is in contact with the root of the connected area), it is subject to wear due to high heat. That is, when the root portion of the cohesive zone comes into contact with the stave body, a thermal load and wear are generated on the stave body.
  • the deposits generated on the surface of the stave in the blast furnace during the stable operation period of the blast furnace have a protective action against the thermal load and wear, and repair the loss portion of the refractory brick in the furnace. If it is possible to maintain an appropriate deposit layer thickness and in-furnace profile by this repair, it is believed that further long-term stable operation and longer life of the blast furnace can be achieved.
  • Patent Document 1 is known as a technique for avoiding the inappropriateness of the profile or circumferential balance of the inner surface of the furnace due to the damage of the refractory brick of the blast furnace as described above. According to Patent Document 1, no refractory bricks are installed on the inner surface of the stave, and the inner wall of the stave itself is used as the furnace wall, so that the change in the shape of the furnace inner surface due to wear of the refractory bricks does not occur. Is described. Patent Document 2 describes that a cooling member is installed near the tuyere in order to positively induce deposits generated on the stave surface.
  • Patent Documents 1 and 2 it is difficult to stably generate the in-furnace surface shape formed by the adhering layer on the stave surface for a long period of time in the height direction and the circumferential direction of the blast furnace.
  • the profile in the blast furnace changes due to changes in charge and operating conditions during blast furnace operation.
  • the circumferential balance of the inner surface profile of the furnace in the blast furnace direction changes, the stable operation of the blast furnace is hindered, causing a decrease in productivity.
  • the stave and the iron skin are rapidly heated from room temperature to a high temperature of about 1500 ° C. to 2000 ° C.
  • the present invention has an object to provide a blast furnace morning glory structure and a design method thereof that can form a furnace surface profile in a stable operation period after the refractory brick disappears due to thermal shock or wear.
  • the present invention realizes a blast furnace in which the change in the shape of the surface of the furnace is small over one blast furnace cost, and stable operation over a long period of time and an improvement in life can be achieved. That is, in the present invention, the thickness of the refractory bricks arranged on the in-furnace surface side of the stave when the blast furnace is constructed is reduced, and the stave outside the refractory bricks is arranged at an appropriate position. Because of these, after the refractory brick disappears in the early stage of blast furnace operation after firing, an adhering layer is quickly generated on the surface of the stave. Since the change in the furnace surface profile becomes small, stable operation of the blast furnace can be maintained for a long time.
  • a blast furnace morning glory structure is a cylindrical morning glory structure that is provided between a tuyere portion and a furnace belly portion of a blast furnace, and expands in the vertical direction.
  • the morning glory portion has an annular iron skin, a copper or copper alloy morning glory stave provided on the inner periphery of the iron skin, and a refractory brick provided on the inner periphery of the morning glory stave.
  • the horizontal thickness of the refractory brick at the upper edge of the morning glory is 50 to 250 mm; the horizontal thickness of the refractory brick at the lower edge of the morning glory is 200 to 500 mm;
  • the narrow angle formed by the surface of the morning glory stave and the horizontal plane is 75 to 82 ° when viewed in a cross section.
  • the thickness of the refractory bricks in the blast furnace morning glory is made thinner than the thickness of the refractory bricks disposed in the conventional blast furnace, so It is possible to greatly suppress changes in the furnace surface profile caused by wear and disappearance of the refractory bricks in the morning glory. Furthermore, the brick cost at the time of blast furnace construction can be reduced, and the brick construction period of morning glory can be shortened. That is, in the said aspect of this invention, the furnace surface profile of the morning glory part of the blast furnace at the time of burning is defined by the surface of the refractory brick arrange
  • the deposit layer that is generated and grown on the surface of the stave forms an in-furnace surface profile that is close to that of the fire (design time), and may shift to the stable operation period of the blast furnace. it can.
  • the inner surface of the furnace in the morning glory of the blast furnace is a fusion zone of the charge descending in the furnace (softening and melting of the ore in the charge starts, and the ores in the semi-molten state are fused together.
  • the charge containing the ore in a semi-molten state is cooled and fixed on the surface of the stave main body, and thereby an adhesion layer generated on the inner surface of the stave main body is generated and grows.
  • positioned in the morning glory part of a blast furnace is comprised by the stave main body made from copper or a copper alloy.
  • the stave main body made from copper or a copper alloy since the thermal conductivity and heat removal capability of copper and copper alloys are high, the charge containing semi-molten ore can be rapidly cooled on the surface of the stave body by using a stave body made of copper or copper alloy. can do.
  • the deposit layer can be quickly generated and grown on the surface side in the blast furnace of the stave after the disappearance of the refractory brick. Furthermore, even if the deposit layer disappears due to changes in the charge and operating conditions of the blast furnace, the deposit layer can be regenerated early.
  • the horizontal thickness of the refractory brick at the upper edge position of the morning glory portion is 50 to 250 mm; the horizontal thickness of the refractory brick at the lower edge position of the morning glory portion is 200 to 500 mm. That is, in this structure, the thickness of the refractory brick in the morning glory portion of the blast furnace is thinner than in the past. As a result, it is possible to reduce the change in the furnace surface profile of the morning glory part of the blast furnace before the disappearance of the refractory brick in the furnace height direction and the circumferential direction of the furnace, and the in-furnace surface profile of the morning glory part of the blast furnace after the disappearance of the refractory brick. it can.
  • the wear state of the refractory bricks in the furnace circumferential direction may vary greatly between the initial operation period after the firing and the stable operation period.
  • this has caused a problem that the circumferential balance of the furnace surface profile has deteriorated, leading to unstable blast furnace operation and reduced productivity.
  • the profile change of the furnace inner surface from the initial operation period after the blast furnace can be fired to the stable operation period can be minimized. This eliminates the need to adjust the operating conditions and the charge distribution over and over according to changes in the furnace surface profile at the initial stage of operation after blast furnace firing.
  • the adjustment frequency of the operating conditions and the charge distribution is remarkably reduced as compared with the conventional case, and the blast furnace operation can be stabilized at a high level for a long time. Furthermore, according to the above aspect of the present invention, since the amount of refractory bricks in the morning glory portion of the blast furnace can be reduced as compared with the conventional case, it is possible to reduce the brick purchase cost and the brick work cost at the time of blast furnace repair, and further, the blast furnace repair The construction period can be shortened.
  • the in-furnace surface profile in the stable operation period of the blast furnace is formed by a deposit layer generated on the stave furnace inner surface after the disappearance of the refractory bricks.
  • the charge containing the semi-molten ore in the morning glory portion is rapidly cooled on the surface of the stave body during the stable operation period of the blast furnace, so that It has been found that the tilt angle of the kimono layer with respect to the horizontal plane in the furnace surface profile is about 75 °.
  • the narrow angle formed by the surface of the morning glory stave and the horizontal plane is 75 to 82 °, more preferably 75 to 78 °.
  • the vertical dimension from the center of the tuyere provided at the tuyere to the lower edge position of the morning glory is 1200 to 1350 mm; It is desirable that the horizontal dimension from the tip of the head to the lower edge position of the morning glory is 700 to 1100 mm.
  • this is a morning glory stave consisting of a copper or copper alloy stave body with high thermal conductivity and high heat extraction (cooling) capacity, and the lower end in the blast furnace has a high temperature region. Place it at a position that is close to the raceway at the tip of the tuyere.
  • the above-described raceway is a space having a high porosity in which high-speed gas is blown from the tuyere and fluidized coke in front of the tuyere.
  • the vertical dimension from the center of the tuyere provided at the tuyere to the upper edge position of the morning glory is preferably 4500 mm to 5500 mm.
  • the furnace inner surface of the morning glory part of the blast furnace supports the root of the fusion zone of the charge descending in the furnace and plays a role of maintaining stable operation of the blast furnace.
  • the morning glory stave is placed above the mouth at an appropriate angle of inclination (the narrow angle formed by the surface of the morning glory stave described above and the horizontal plane), and the vertical direction from the center of the tuyere to the upper edge position of the morning glory By making the dimension of the sufficient length, the root portion of the cohesive zone can be stably supported.
  • the morning glory stave has a projection that protrudes from the reference surface to the inside of the furnace with the surface inside the furnace as a reference surface and is continuous in the furnace circumferential direction.
  • the protrusion including the semi-molten iron ore
  • the operation in the blast furnace can be stably maintained for a long time.
  • the stave body by covering the stave body with a deposit layer that has been generated and grown along the reference surface of the stave body (cell flying effect), the stave body is not directly exposed to the high-temperature cohesive zone, and the morning glory part and the furnace belly part Heat resistance as a stave can be increased.
  • a copper or copper alloy stave body having a high thermal conductivity and a high heat extraction capability is used, so the charge containing the semi-molten ore descending in the blast furnace is the reference plane. After decelerating by the protrusion, it cools rapidly and adheres to the reference surface. As a result, even if the deposit layer on the reference surface is peeled off due to a change in the operating condition of the blast furnace, the deposit layer of the deposit can be regenerated at an early stage.
  • the protrusion is sufficiently cooled only by the cooling conduit inside the stave body.
  • a blast furnace design method includes a tuyere part, a furnace belly part, and a cylindrical morning glory part that is provided between the tuyere part and the furnace belly part and expands in the vertical direction.
  • the morning glory portion is an annular iron skin, a copper or copper alloy morning glory stave provided on the inner periphery of the iron skin, and a refractory brick provided on the inner periphery of the morning glory stave.
  • the horizontal thickness of the refractory brick at the upper edge position of the morning glory portion is 50 to 250 mm; and the horizontal thickness of the refractory brick at the lower edge position of the morning glory portion
  • the narrow angle formed between the surface of the morning glory portion stave and the horizontal plane is 75 to 82 ° when the morning glory portion is viewed in a cross section including its axis. According to this blast furnace design method, the same effect as the blast furnace morning glory structure according to one aspect of the present invention described above can be obtained.
  • a blast furnace 1 has a cylindrical furnace body 2 constructed on a foundation ground.
  • the furnace body 2 is divided into a furnace mouth part S1, a shaft part S2, a furnace belly part S3, a morning glory part S4, a tuyere part S5, and a furnace bottom part S6 in order from the upper gas collecting mantel 3.
  • the inner diameter of the shaft portion S2 expands downward
  • the inner diameter of the furnace belly portion S3 is the maximum diameter
  • the inner diameter of the morning glory portion S4 decreases downward.
  • the morning glory part S4 has a cylindrical shape, is provided between the tuyere part S5 and the furnace belly part S6, and expands in diameter in the vertical direction.
  • a charging device is usually installed in the gas collection mantel 3, and a granular charge 4 is charged into the furnace from this charging device.
  • a charge 4 an ore-based charge having a particle size of about 8 to 25 mm and a coke-based charge having a particle size of about 20 to 55 mm are alternately charged in layers.
  • a massive band 4A in which iron ore and coke are alternately layered is formed in the furnace port portion S1 and the shaft portion S2 in the furnace.
  • the furnace body 2 is provided with a tuyere 5 above the furnace bottom S6, and hot air 5A is blown from here.
  • the hot air 5A burns the coke in the block 4A to a higher temperature, and in the vicinity of the tuyere 5 raceway 5B (high-speed gas is blown from the tuyere 5 to cause the coke in front of the tuyere 5 to flow. A space having a high porosity is formed. Due to the high heat of the raceway 5B, the iron ore in the block 4A is melted.
  • a substantially conical fusion band 4B is formed in the furnace from the morning glory part S4 to the lower part of the shaft part S2.
  • the iron 6A melted in the fusion zone 4B passes through the dripping zone 4C, drops toward the furnace bottom S6, and accumulates in the furnace bottom S6 as a molten iron 6B.
  • Coke or the like that could not be burned in the cohesive zone 4B passes through the dripping zone 4C and descends, accumulates in the furnace bottom S6, and forms a conical furnace core 4D on the hot metal 6B.
  • a hot iron outlet 6 is installed in the furnace bottom portion S ⁇ b> 6, and the hot metal 6 ⁇ / b> B accumulated in the furnace bottom portion S ⁇ b> 6 is taken out of the blast furnace 1 through the hot iron outlet 6.
  • the furnace body 2 has an iron skin 2A on the outermost periphery, and a cooling stave and a refractory brick 2D are stretched inside the iron skin 2A.
  • a stave 2B for the shaft is stretched in a region S7 facing from the upper portion of the shaft portion S2 to the middle lump 4A. In this region S7, since the granular charge 4 contained in the massive band 4A descends sequentially while contacting the surface of the stave 2B, mechanical wear may occur on the surface of the stave 2B.
  • a morning glory stave 2C is stretched from a lower portion of the shaft portion S2 to a region S8 including the furnace belly S3 and the morning glory S4.
  • a fusion zone 4B made of a high-temperature charge 4 (a region in which softening and melting of the ore in the charge 4 has started, and the ores in a semi-molten state are fused together and connected in a plate shape. )
  • the root part 4E descends sequentially while coming into contact, so that the surface of the stave 2C inside the blast furnace 1 may be worn due to high temperature.
  • a refractory brick 2D is stretched on the inner surfaces of the staves 2B and 2C as necessary.
  • the refractory bricks 2E are thickly stacked on the furnace bottom S6 where the hot metal 6B is stored.
  • the blast furnace morning glory structure 9 is employed in a region from the lower part of the furnace belly S3 to the tuyere 5 of the tuyere part S5, which mainly includes the morning glory part S4.
  • the morning glory portion S4 of the blast furnace morning glory structure 9 includes an annular iron skin 2A installed on the outside, a copper or copper alloy morning glory stave 10 provided on the inner periphery of the iron skin 2A, and this morning glory portion.
  • the fire brick 20 (2D) provided on the inner periphery of the stave 10 is provided.
  • the morning glory portion stave 10 may be a casting that is cast together with copper or a copper alloy.
  • the stave 2C includes a thin plate-like stave body 11 cut out from a copper or copper alloy plate.
  • a plurality of horizontally extending projections 12 are formed on the surface side of the stave body 11, and a recess 13B that is recessed toward the outside of the blast furnace 1 is formed therebetween.
  • the surface of the recess 13 ⁇ / b> B that is one step lower than the protrusion 12 is a flat surface (reference surface) 13.
  • the morning glory portion stave 10A (10) disposed on the upper end side of the morning glory portion S4 is disposed from the morning glory portion S4 to the furnace belly portion S3.
  • the morning glory portion stave 10A only the portion located in the morning glory portion S4 is inclined with respect to the axis O of the morning glory portion S4.
  • the inclination angle (narrow angle) ⁇ between the plane (reference plane) 13 of the morning glory portion stave 10 and the horizontal plane is 75 to 82 °.
  • the angle is preferably 75 to 78 °.
  • the morning glory portion stave 10 arranged on the tuyere portion S5 side of the morning glory portion stave 10A is similarly inclined with respect to the axis O.
  • the horizontal thickness L L of the refractory brick 20 (2D) at the lower edge position E L of the morning glory part S4 is 200 to 500 mm, preferably about 200 to 300 mm.
  • the concave portion 13B including the flat surface 13 serving as a reference surface is formed by cutting from the surface of the stave body 11, and the protrusion 12 is formed by being left uncut during the cutting.
  • the flat surface 13 is a reference surface of the morning glory portion stave 10
  • the protrusion 12 protrudes from the reference surface of the morning glory portion stave 10.
  • the protrusions 12 are continuous with each other when the morning glory stave 10 is stretched in the furnace, and in the blast furnace 1, each protrusion 12 forms a complete annular shape.
  • the tip surface of the protrusion 12 may be coated with a high hardness material such as TiN, TiC, WC, or Ti—Al—N.
  • Projection amount of the protrusion 12 from the flat surface 13 which is the reference surface is 50 to 150 mm (protrusion amount approximately 1 to 3 times the maximum particle size of 55 mm of the coke-based charge having a large average particle size), and adjacent protrusions
  • the interval of 12 is about 500 to 1000 mm, more preferably 500 to 700 mm.
  • the adjacent protrusions 12 increase the cooling efficiency of the charge by reducing the rate of descent of the charge on the flat surface 13 which is the reference surface of the stave body 11, and promote the formation of the deposit layer.
  • the interval between the adjacent protrusions 12 is important. When the interval between the adjacent protrusions 12 becomes larger than 1000 mm, the descending speed of the charge containing the semi-molten ore that descends particularly near the protrusions 12 on the high position side is reduced, and the flat surface 13 that is the reference surface is cooled by cooling. This reduces the effect of forming the deposit layer.
  • the descending speed of the charge containing the semi-molten ore descending between the adjacent protrusions 12 is reduced, and is generated on the plane 13 which is the reference surface by cooling.
  • the thickness of the deposit layer becomes excessively thick. If the deposit layer is formed too thick, when the deposit layer is peeled off due to changes in the operating conditions of the blast furnace 1, the furnace inner surface profile of the morning glory part and the furnace belly part will change greatly, and the stable operation of the blast furnace 1 will be improved. It is not preferable to maintain.
  • a refractory 13 ⁇ / b> A is stretched in the recess 13 ⁇ / b> B (between adjacent protrusions 12) along the plane 13 that is a reference plane.
  • a refractory brick 20 different from the refractory 13 ⁇ / b> A is stretched along the refractory 13 ⁇ / b> A and the front end surfaces of the protrusions 12.
  • the refractory brick 20 constitutes the refractory brick 2D inside the stave 2C described above (see FIG. 1).
  • the horizontal direction thickness L U of refractory bricks 2D thickness, i.e. refractory brick 20 at the upper edge position E U morning glory portion for the staves 10 is 50 ⁇ 250 mm
  • the lower edge thereof horizontal thickness L L refractory brick 20 at the position E L is 200 ⁇ 500 mm.
  • the refractory brick 20 and the refractory 13 ⁇ / b> A protect the morning glory portion stave 10 from heat shock when the blast furnace 1 is fired (a state in which no covering with deposits is yet obtained).
  • the refractory brick 20 and the refractory 13A are sequentially worn by the high heat and frictional force received from the root 4E of the fusion zone 4B of the charge 4 in the high temperature state shown in FIG. .
  • the in-furnace profile P ⁇ b> 1 in the morning glory portion S ⁇ b> 4 is constituted by the worn surface of the refractory brick 20.
  • the deposit 7 layer caused by the charge 4 grows against disappearance due to the wear of the refractory brick 20, and the inside surface of the morning glory portion stave 10 has the deposit 7 layer.
  • the deposit 7 layer caused by the charge 4 grows against disappearance due to the wear of the refractory brick 20, and the inside surface of the morning glory portion stave 10 has the deposit 7 layer.
  • deposits 4 are attached to the reference surface 13 of the stave body 11 or the surface of the refractory 13A. Seven layers are generated and grown, and the deposit 7 is formed with a small thickness. And the refractory 13A and the projection part 12 in the morning glory part S4 are further coat
  • the deposit 7 layer further grows on the reference surface 13 of the stave body 11 or the deposit 7 layer formed by the in-furnace profile P3, and the deposit 7
  • the furnace surface profile P0 of the refractory brick 20 in the morning glory portion S4 at the time of firing is approached.
  • the plane 7 13 or the projection 12 is covered. Thereby, the inner surface of the blast furnace 1 of the morning glory portion stave 10 is automatically leveled to a smooth surface by the seven layers of deposits.
  • a cooling pipe (not shown) is formed inside the stave body 11, and a cooling pipe 16 is connected to the back side of the stave body 11. Cooling water from the cooling pipe 16 is passed through the cooling pipe line inside the stave body 11, and the flat surface 13 and the protrusion 12 that are the reference plane of the morning glory portion stave 10 are cooled by adjusting the flow rate of the cooling water. , Each is adjusted to an appropriate temperature. By such appropriate cooling, the growth of the deposit 7 layer (see FIG. 3) of the charge 4 is promoted, and the thickness of the deposit 7 layer on the surface of the morning glory stave 10 inside the blast furnace 1 is appropriately adjusted. The covering state can be adjusted.
  • the initial surface shape (initial profile) is formed on the inner surface of the blast furnace 1 of the refractory brick 20 from the start of the blast furnace (during design) to the initial stage of the blast furnace operation. After 20 disappears due to wear, an in-furnace surface profile in the stable operation period is formed on the inner surface of the blast furnace 1 by the seven deposits generated on the surface of the stave body 11.
  • the in-furnace surface profile in the morning glory changes greatly in the early stage of operation from 2 to 4 years after the start of the fire, causing unstable blast furnace operation and reduced productivity. It was.
  • the morning glory portion stave is formed such that the thickness of the fireproof brick 20 in the morning glory portion S4 is reduced and the deposit 7 layer is quickly formed on the reference surface of the stave body 11 after the fireproof brick 20 disappears.
  • 10 is inclined at an appropriate angle, so that the change in the furnace surface profile at the initial stage of operation after firing is small compared to the furnace surface profile at the time of firing (design time), thus improving the stability and productivity of blast furnace operation. It can be maintained well.
  • the arrangement of the morning glory stave 10 with respect to the tuyere 5 is set to a specific setting. That is, in the blast furnace morning glory structure 9, the morning glory portion stave 10 arranged in the region of the morning glory portion S4 has a horizontal plane and the reference plane 13 of the morning glory portion stave 10 when the morning glory portion S4 is viewed in a cross section including the axis.
  • the inclination angle ⁇ is set to 75 to 82 °, more preferably 75 to 78 °.
  • the lower edge position of the morning glory part S4 from the center H0 of the tuyere 5 provided in the tuyere part S5 (the lower end position of the inner surface of the blast furnace 1 of the morning glory stave 10 installed at the lowest stage of the blast furnace morning glory structure 9)
  • the vertical dimension H1 up to E L is 1200 to 1350 mm
  • the horizontal dimension D1 from the tip D0 of the tuyere 5 to the lower edge position E L of the morning glory S4 is 700 to 1100 mm (see FIG. 2).
  • the center height H0 of the tuyere 5 refers to the height of the pivot center position when the nozzle of the tuyere 5 is pivotable.
  • the morning glory portion stave 10 made of the copper or copper alloy stave body 11 having high thermal conductivity and high heat extraction capability is provided in the blast furnace 1.
  • a stable deposit layer that is thin and difficult to peel off can be formed on the surface of the morning glory portion stave 10 in the blast furnace 1 at an early stage, and a more stable in-furnace profile can be maintained in blast furnace operation. .
  • the wear rate of the stave can be slowed by the protective effect, the life of the blast furnace morning glory structure can be extended. From the initial operation after the blast furnace 1 is fired to the stable operation period, a stable deposit layer that is thin and difficult to peel off is formed on the inside surface of the morning glory stave 10 so that the blast furnace 1 is charged and operated. Also, the change in the furnace surface profile of the morning glory S4 in the furnace height direction and the furnace circumferential direction becomes smaller than the furnace surface profile in the firing (design time). As a result, it is possible to avoid operational instability and productivity reduction due to deterioration of the circumferential balance of the in-furnace surface profile, which is a problem particularly in a large blast furnace, and to stabilize the long-term operation of the blast furnace 1.
  • the upper edge position of the morning glory portion S4 from the tuyere center H0 provided at the tuyere portion S5 (the upper end of the surface in the blast furnace 1 of the morning glory portion stave 10 installed at the lowermost stage of the blast furnace morning glory structure 9 described above) position) dimension H2 of the vertical direction to the E U is the 4500 ⁇ 5500 mm.
  • the inner surface of the morning glory portion S4 of the blast furnace 1 supports the root 4E of the fusion zone 4B of the charge 4 descending in the blast furnace 1, and plays a role of maintaining stable operation of the blast furnace 1.
  • the refractory bricks 20 are worn with the operation after the blast furnace is fired.
  • the in-furnace surface profile of the direction is maintained in an appropriate state, and the deterioration of the operation performance of the blast furnace 1 due to the aging of the in-furnace surface profile can be minimized.
  • the secular change of the in-furnace surface profile in the blast furnace morning glory structure 9 of this embodiment and the secular change in the conventional blast furnace morning glory structure to which this embodiment is not applied are compared by computer simulation.
  • FIG. 4 shows a change in the production amount with the passage of operating years in the conventional blast furnace morning glory structure to which the present embodiment is not applied.
  • 5, 6, and 7 schematically show the wear situation of the morning glory refractory brick 20 at the time of firing (designing), the initial operation and the stable operation period of the blast furnace morning glory structure.
  • FIG. 8 shows a change in the production amount with the passage of operating years in the blast furnace morning glory structure 9 to which the present embodiment is applied.
  • 9, 10, and 11 schematically show the wear state of the refractory brick 20 of the morning glory portion S ⁇ b> 4 at the time of firing (design time), the initial operation and the stable operation period of the blast furnace morning glory structure 9. .
  • the conventional blast furnace 1 whose production amount is changed in FIG. 4 has the same basic structure of the morning glory portion S4 as the embodiment of the present invention shown in FIG. 1 and FIG. the thickness of the furnace refractory bricks 20 disposed on the surface side (the horizontal direction of the thickness at the lower edge position E L of the bosh section for staves 10) is larger than 500mm in use staves 10, the upper edge position E u is greater than 250mm
  • the dimension H2 is smaller than 4000 mm, and the inclination angle ⁇ is larger than 82 °.
  • the period of operation from 2 to 4 years is “morning glory brick damage dropout time T3”.
  • the refractory bricks 20 are almost damaged, and each portion is sequentially dropped, so that the furnace surface profile is deteriorated and the circumferential balance of the morning glory portion S4 is deteriorated (see FIG. 6).
  • damage or dropout of the refractory brick 20 starts from a specific part of the morning glory S4 in the furnace circumferential direction and sequentially expands to the entire circumference. For this reason, the furnace surface profile deteriorated, and the blast furnace operation was greatly affected by the imbalance in the circumferential balance, becoming unstable until reaching the entire circumference, and the state of greatly reduced production continued (See time T3 in FIG.
  • the operation period of 4 to 10 years is the “operation stable period T4”.
  • the refractory bricks 20 are completely disappeared, and the inner surface of the furnace is formed by the surface of the morning glory portion stave 10 or the deposit layer (see FIG. 7).
  • seven layers of deposits of appropriate thickness are generated on the surface of the morning glory stave 10. Due to the seven layers of deposits, a smooth in-furnace surface profile is formed on the in-furnace surface, and the circumferential balance over the entire circumference in the furnace circumferential direction is improved. For this reason, compared with morning glory brick damage drop-off time T3, blast furnace operation is also stabilized and production volume is also recovered.
  • the production volume L1 at this time has a linear trend that gradually decreases to the right due to aging of each part of the blast furnace (see time T4 in FIG. 4).
  • time T4 in FIG. 4 The production volume L1 at this time has a linear trend that gradually decreases to the right due to aging of each part of the blast furnace.
  • seven layers of deposits on the inner surface of the morning glory staves 10 are sporadic when the quality of raw materials and fuels and the operating conditions change during the mid-term operation stable period T4. May peel off or fall off.
  • the furnace surface profile temporarily changes suddenly, the circumferential balance deteriorates, and a large fluctuation of the production amount occurs temporarily.
  • the operation years from 10 to 14 years will be “operational unstable period T5”.
  • wear of the morning glory portion stave 10 also progresses, and the influence due to fluctuations in raw fuel quality (deterioration of coke quality, fluctuation in sintering quality, etc.) becomes large.
  • the disappearance of deposits and the change in regeneration increase.
  • the change in the furnace surface profile and the change in the circumferential balance further increase, and the situation in the blast furnace 1 fluctuates greatly as compared with the operation stable time T4 described above.
  • the production amount decreases and the fluctuation also increases.
  • the production amount L2 at this time has a linear trend that is largely downward to the right (see time T5 in FIG. 4).
  • the blast furnace 1 shown in FIG. 8 adopts the blast furnace morning glory structure 9 of the present embodiment shown in FIG. 1, FIG. 2 and FIG. 3 described above, on the inner surface side of the morning glory portion stave 10.
  • the upper edge position E u morning glory for stave 10 positioned at the bottom is the 50 ⁇ 250 mm
  • the lower edge position E L is 200 ⁇ 500 mm morning glory for stave 10
  • the inclination angle ⁇ formed by the reference plane 13 and the horizontal plane is 75 to 82 °.
  • the operation period of 2 to 4 years is the “morning glory brick removal time U3”.
  • the refractory brick 20 may be damaged, and the parts may fall off sequentially.
  • the thickness of the refractory brick 20 is thinly formed based on this embodiment, the occurrence of a large change in the furnace surface profile or a large change in the circumferential balance of the morning glory portion S4 is suppressed as compared with the conventional case. (See FIG. 10). Thereby, it is possible to avoid the unstable operation and the large decrease in the production amount as in the conventional case (time T3 in FIG. 4) (see time U3 in FIG. 8, profile P1 in FIG. 3).
  • the operation period of 4 to 10 years is the “operation stable period U4”.
  • the morning glory portion S4 the refractory bricks 20 are completely disappeared, and the inner surface of the furnace is formed by seven layers of deposits generated on the surface of the morning glory portion stave 10 (see FIG. 11).
  • the morning glory portion stave 10 is arranged so that the plane 13 which is the reference surface of the morning glory portion stave 10 has an appropriate inclination angle ⁇ (75 to 82 °). Yes.
  • the deposit 7 layer is efficiently generated with a thin thickness in the furnace surface of the morning glory stave 10 and a uniform thickness in the furnace circumferential direction, so that a smooth furnace surface profile is secured, and the blast furnace The circumferential balance over the entire circumference of 1 is also good. For this reason, the operation of the blast furnace is stable, and a value close to the target production level L0 can be secured (see time U4 in FIG. 8, profiles P2 to P3 in FIG. 3).
  • the deposit 7 layer is formed and grows on the inside surface of the morning glory stave 10 in a state where the thickness is thinner and it is difficult to peel off, the deposit layer is sporadic as in the past. By dropping off, the furnace surface profile does not change suddenly. Furthermore, the circumferential balance over the entire circumference of the blast furnace 1 does not deteriorate, and stable blast furnace operation can be maintained. In addition, if the inclination angle of the flat surface 13 that is the reference surface of the morning glory portion stave 10 is appropriate, even if the deposit 7 layer sporadically peels off and drops when the operating conditions change, The seven layers of deposits are efficiently regenerated on the reference surface, and there is no significant decrease in production volume as in the past (time T4 in FIG. 4).
  • the operation period of 10 to 14 years will be the “operation unstable period U5”.
  • the morning glory S4 reaches the end of the furnace as in the conventional case (time T5 in FIG. 4).
  • the furnace surface profile and the circumferential balance are optimized. A value close to the target production level L0 can be secured (see time U5 in FIG. 8).
  • the furnace surface profile in the stable operation period formed by the inside surface of the morning glory stave 10 and the deposit 7 thereof is when the inclination angle of the morning glory portion 10 with respect to the horizontal plane is 75 to 78 °. As described above, the same effect can be obtained even when the inclination angle ⁇ is 75 to 82 °.
  • the lower edge position E L (see FIG. 2) of the inner surface of the morning glory portion stave 10 installed at the lowest stage of the blast furnace morning glory structure 9 is the morning glory portion S4 from the center H0 of the tuyere 5.
  • the vertical dimension H1 to the lower edge position E L of the head is 1200 to 1350 mm
  • the horizontal dimension D1 from the tip D0 of the tuyere 5 to the lower edge position E L of the morning glory S4 is 700 to 1100 mm. That's fine.
  • the boundary of the bosh section S4 and tuyere portion S5 is, if that can be set down as bosh portion S4 'and the tuyere section S5' (see FIG.
  • the lower edge position E L ′ can be set to In this case, the lower edge position E L 'is set on an extension of a line connecting the original lower edge position E L on the edge position E U, from the center H0 tuyeres 5 lower edge position E L' dimensions to H1 '
  • the dimension D1 ′ from the tip D0 of the tuyere 5 to the lower edge position E L ′ is obtained.
  • These dimensions H1 ′ and D1 ′ are also within the numerical ranges of the dimensions H1 and D1 described above.
  • each protrusion 12 is continuously annular, but may be discontinuous to each other, The structure etc. which are arranged in a different zigzag may be sufficient. However, circumferential balance is important for the operation of the blast furnace 1, and consideration should be given so that symmetry is obtained with respect to the center of the blast furnace 1.
  • the protrusions 12 may be formed on the surface of the morning glory portion stave 10, or another member that becomes a protrusion on the furnace inner surface may be installed separately from the stave. In the present embodiment, it is more preferable to form the protrusion 12.
  • the piping 16 for cooling is formed on the morning glory portion stave 10 including the protruding portion 12, but the protruding portion 12 may be omitted.
  • the arrangement of the protrusions 12, the cross-sectional shape, the arrangement of the cooling pipes 16, the overall shape and dimensions of the stave 10 may be appropriately selected in the implementation.

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  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Blast Furnaces (AREA)
PCT/JP2010/066879 2009-09-29 2010-09-29 高炉朝顔部構造およびその設計方法 WO2011040425A1 (ja)

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BR112012007569A BR112012007569A2 (pt) 2009-09-29 2010-09-29 estrutura de zona de bojo de alto-forno e método de projeto de zona de bojo de alto-forno
JP2010550385A JP4757960B2 (ja) 2009-09-29 2010-09-29 高炉朝顔部構造およびその設計方法
KR1020127007772A KR101334479B1 (ko) 2009-09-29 2010-09-29 고로 보시부 구조 및 그 설계 방법
CN201080042957.2A CN102575303B (zh) 2009-09-29 2010-09-29 高炉炉膛部构造及其设计方法
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Publication number Priority date Publication date Assignee Title
CN104271774A (zh) * 2012-05-11 2015-01-07 新日铁住金工程技术株式会社 高炉的风口部结构
JP2018044230A (ja) * 2016-09-16 2018-03-22 新日鐵住金株式会社 高炉朝顔部構造および高炉の設計方法

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JPH06299215A (ja) * 1993-04-13 1994-10-25 Nippon Steel Corp 高炉の操業法
JPH07278623A (ja) * 1994-04-15 1995-10-24 Nippon Steel Corp 高炉の操業方法
JP2005248209A (ja) * 2004-03-01 2005-09-15 Nippon Steel Corp 高炉炉体冷却体とそれを用いた高炉炉体冷却装置の構造

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JPS59226106A (ja) * 1983-06-06 1984-12-19 Nippon Steel Corp 竪型炉
JPH07278652A (ja) * 1994-04-11 1995-10-24 Sumitomo Metal Ind Ltd 加工性に優れた冷間鍛造用素形鋼材の製造方法
JP2001263960A (ja) * 2000-03-16 2001-09-26 Kawasaki Steel Corp 高炉炉壁レンガ支持構造及び高炉操業方法

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Publication number Priority date Publication date Assignee Title
JPH06299215A (ja) * 1993-04-13 1994-10-25 Nippon Steel Corp 高炉の操業法
JPH07278623A (ja) * 1994-04-15 1995-10-24 Nippon Steel Corp 高炉の操業方法
JP2005248209A (ja) * 2004-03-01 2005-09-15 Nippon Steel Corp 高炉炉体冷却体とそれを用いた高炉炉体冷却装置の構造

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104271774A (zh) * 2012-05-11 2015-01-07 新日铁住金工程技术株式会社 高炉的风口部结构
JP2018044230A (ja) * 2016-09-16 2018-03-22 新日鐵住金株式会社 高炉朝顔部構造および高炉の設計方法

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JP4757960B2 (ja) 2011-08-24
KR101334479B1 (ko) 2013-11-29
KR20120056285A (ko) 2012-06-01
JPWO2011040425A1 (ja) 2013-02-28

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