WO2013168784A1 - Structure for tuyere section in blast furnace - Google Patents
Structure for tuyere section in blast furnace Download PDFInfo
- Publication number
- WO2013168784A1 WO2013168784A1 PCT/JP2013/063139 JP2013063139W WO2013168784A1 WO 2013168784 A1 WO2013168784 A1 WO 2013168784A1 JP 2013063139 W JP2013063139 W JP 2013063139W WO 2013168784 A1 WO2013168784 A1 WO 2013168784A1
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- WO
- WIPO (PCT)
- Prior art keywords
- tuyere
- blow pipe
- furnace
- blast furnace
- iron skin
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
- C21B7/163—Blowpipe assembly
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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
- C21B7/106—Cooling of the furnace bottom
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- 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
- F27B1/12—Shells or casings; Supports therefor
- F27B1/14—Arrangements of linings
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- 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
- F27B1/16—Arrangements of tuyeres
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- 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
- F27B1/24—Cooling arrangements
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- 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
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
- F27D1/045—Bricks for lining cylindrical bodies, e.g. skids, tubes
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- 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
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements
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- 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
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/0002—Cooling of furnaces
Definitions
- the present invention relates to a blast furnace tuyere structure, and in particular can be used as a blast furnace tuyere with a stave cooler installed around the tuyere.
- Patent Document 1 Conventionally, in a blast furnace, many tuyere are installed at a predetermined height position of the furnace body. A blow pipe is connected to each tuyere from an annular pipe arranged around the furnace body, hot air is supplied from the blow pipe to the tuyere, and hot air is blown from each tuyere into the furnace.
- the tuyere 8 for feeding high-temperature air into the furnace is held by the Daimaru 9, and the Daimaru 9 is held by the Daimaru holding hardware 10, and the Daimaru holding hardware 10 is It is fixed to the iron skin 11 on the outer periphery of the blast furnace.
- the tuyere brick 5 is arranged so as to surround the Daimaru 9.
- the tuyere brick 5 is formed by combining a plurality of bricks so as to surround the Daimaru 9.
- a hearth brick is built on the hearth of the blast furnace hearth, and a hearth wall brick 7 is built on the upper hearth wall.
- the tuyere brick 5 is constructed so as to ride on the hearth wall brick 7, and the morning glory brick 6 is constructed on the tuyere brick 5.
- the stave cooler 1 is arranged between the morning glory brick 6 and the iron skin 11 and between the hearth wall brick 7 and the iron skin 11.
- a tuyere cooler 1a for the tuyere is disposed between the tuyere brick 5 and the iron skin 11.
- a plurality of cooling water pipes are arranged inside the stave coolers 1, 1 a, and cooling water is supplied via the cooling water pipe 15.
- the stave coolers 1 and 1a are cooled by the cooling water flowing through the cooling water piping, and heat from the inside of the furnace is cut off to protect the iron skin 11.
- the tuyere 8 and the large circle 9 surrounded by the tuyere brick 5 are fixed to the iron shell 11 via a large circular holding hardware 10. Since the iron skin 11 is kept at a low temperature by being cooled by a stave cooler, the thermal expansion is small, so the position of the tuyere 8 hardly changes.
- the furnace bottom brick and the hearth wall brick 7 are heated to a high temperature and thermally expanded in order to store hot metal and soot in the furnace. Due to this thermal expansion, the tuyere brick 5 built on the hearth wall brick 7 is pushed upward. In such a structure, the tuyere 8 and the large circle 9 receive a load that is deformed upward by the tuyere brick 5.
- a blow pipe 17 is inserted into the inside of the Daimaru holding hardware 10, the Daimaru 9 and the tuyere 8 from the outside of the iron skin 11.
- the blow pipe 17 is connected to an annular pipe disposed around the furnace body via a Duesen stock 18, hot air from the annular pipe is supplied through these, and hot air is blown into the furnace from each tuyere. It is.
- the blow pipe 17 and the duesen stock 18 are supported by a furnace body not shown which is installed around the furnace body together with the annular pipe.
- the tip of the blow pipe 17 has a convex spherical surface, and the blow pipe connecting portion inside the tuyere 8 is formed into a concave spherical surface, thereby forming a spherical joint.
- the tuyere 8 is held by the furnace body, that is, the iron shell 11 via the Daimaru 9 and the Daimaru holding hardware 10 because of the blast furnace operation, the tip position of the tuyere 8 (hot air blowing position). ) Must be maintained at a predetermined position inside the furnace body.
- the blow pipe 17 or the annular pipe and the furnace body including the tuyere 8 are supported in an independent state, and these are connected by a spherical joint. This is because the annular tube side is supported by a furnace body that does not undergo much thermal deformation, and the behavior of thermal deformation differs between the two.
- the reason why the protective bricks 5, 6, and 7 are stacked on the inside of the furnace of the stave coolers 1 and 1a is mainly to prevent the heat shock in the initial stage of burning and the damage from the hot metal and firewood in the furnace.
- the distance from the iron shell 11 to the tuyere 8 is long, and the blow pipe 17 is also formed correspondingly long.
- the spherical joint is connected by inserting the tip of the blow pipe 17 from the outside of the iron skin 11 into the tuyere 8.
- mutual displacement can be allowed while maintaining airtightness.
- the spherical joint maintains airtightness by metal touch with the spherical surface around the vent hole, high-precision processing is required to form a spherical surface that can ensure airtightness, which increases manufacturing costs.
- the blow pipe 17 is supported in a cantilever state, and its tip position is likely to fluctuate. It may be difficult to properly maintain the close contact state of the tuyere 8 with the spherical joint.
- the tuyere 8 is supported by the Daimaru 9 and is arranged on the inner surface of the furnace.
- the Daimaru 9 or the Daimaru holding hardware 10 is adjusted by machining so that all tuyere 8 arranged in the circumferential direction are uniformly arranged toward the furnace center. Done.
- the tuyere 8 and the Daimaru 9 that supports the tuyere are surrounded by a protective brick 5 and are separated from the stave coolers 1 and 1a. For this reason, the Daimaru 9 undergoes thermal deformation, and the position or posture of the tuyere 8 on the inner surface of the furnace may shift due to this thermal deformation.
- An object of the present invention is to provide a blast furnace blade capable of preventing gas leakage and maintaining the tip position of the tuyere at a predetermined position of the furnace body while absorbing the difference in thermal deformation between the furnace body side and the annular tube side. To provide a mouth structure.
- a tuyere structure of a blast furnace according to the present invention includes a blow pipe fixed to an iron skin, a tuyere fixed to a tip of the blow pipe, and a flexible joint that connects the blow pipe and duesen stock. It is characterized by that.
- the metal touch between the tuyere and the blow pipe can be eliminated, and spherical processing required for the metal touch is performed.
- the manufacturing cost can be reduced by eliminating the above, and gas leakage due to metal touch can be prevented.
- the position of the tuyere fixed to the tip of the blow pipe relative to the iron skin that is, the tip position of the tuyere in the furnace body can be maintained at a predetermined position. Furthermore, by interposing a flexible joint between the blow pipe and the duesen stock, the difference between the thermal deformation on the furnace body side and the thermal deformation on the annular tube side can be absorbed. As a result, gas leakage can be prevented, and the tip position of the tuyere can be maintained at a predetermined position of the furnace body while absorbing the difference in thermal deformation between the furnace body side and the annular tube side.
- a stave cooler is installed inside the iron skin around the tuyere and the stave cooler forms a furnace inner surface. If the distance between the iron skin to which the blow pipe is fixed and the tuyere is large, the blow pipe becomes a cantilever and the tip tuyere position may change. In contrast, in the present invention, the conventional tuyere brick is omitted, and the stave cooler is directly used as the furnace inner surface, so that the length of the blow pipe can be minimized, and fluctuations in tuyere position are suppressed. can do.
- a tuyere opening is formed in the iron skin around the tuyere and the entire circumference of a flange formed on the outer periphery of the blow pipe is joined to the tuyere opening.
- joining it is desirable to use joining by bolts arranged at predetermined intervals on the flange in consideration of attachment / detachment for maintenance work.
- Sectional drawing which shows one Embodiment of this invention Sectional drawing which shows other embodiment of this invention. Sectional drawing which shows a prior art example.
- the tuyere structure 20 of this embodiment includes a blow pipe 31 fixed to an iron skin 21, a tuyere 32 fixed to the tip of the blow pipe 31, a blow pipe 31, and a Duzen.
- a flexible joint 34 for connecting the stock 33 is provided.
- a metal bellows type flexible joint is used because high-temperature and high-pressure hot air supplied into the blast furnace is passed through the inside.
- a tuyere mounting flange is formed at the tip of the blow pipe 31, and the tuyere 32 is fixed to the flange with a bolt or the like.
- the blow pipe 31 has a flange at the end opposite to the tuyere 32, and a flexible joint 34 is connected to the flange.
- the flexible joint 34 has a flange at the end opposite to the blow pipe 31, and a duesen stock 33 is connected to the flange. Duesen stock 33 has an end opposite to flexible joint 34 connected to an annular tube (not shown).
- the blow pipe 31 and tuyere 32 are supported by the iron skin 21 part, and the duesen stock 33 and the flexible joint 34 are supported by the above-described annular pipe (not shown). Further, by supplying hot air from the annular tube, the hot air is sent to the tuyere 32 through the duesen stock 33, the flexible joint 34, and the blow pipe 31, and can be blown out from the tuyere 32. Note that the orientation and position of the tuyere 32 with respect to the blow pipe 31 are adjusted in advance so as to have appropriate numerical values when placed in the furnace.
- a tuyere opening 211 is formed in the iron skin 21, and a flange 311 is formed on the outer periphery of the blow pipe 31.
- the blow pipe 31 is inserted into the furnace (left side in the figure) from the tuyere opening 211 on the tip side (tuyere 32 side), and the flange 311 closes the tuyere opening 211.
- the flange 311 and the periphery of the tuyere opening 211 are joined in an airtight state by, for example, bolting at a predetermined interval.
- the blow pipe 31 is fixed to the iron skin 21 by joining the flange 311 and the periphery of the tuyere opening 211.
- the tuyere portion cooler 23 has a notch portion 231 for tuyere insertion.
- the blow pipe 31 and the tuyere 32 inserted inside the iron skin 21 through the tuyere opening 211 are passed through the notch 231 and arranged so as to be surrounded by the tuyere stave cooler 23.
- a hearth wall brick 25 is built inside the furnace bottom stave cooler 22.
- No refractory bricks (such as the tuyere brick 5 in FIG. 3) are built inside the tuyere stave cooler 23 and the morning glory stave cooler 24. Instead, the refractory blocks 232 and 242 are fitted on the furnace inner surfaces of the tuyere stave cooler 23 and the morning glory stave cooler 24.
- the thickness T1 from the iron skin 21 to the inner surface of the furnace is the thickness from the conventional iron skin 11 to the inner surface of the furnace indicated by a one-dot chain line in the figure. It is thinner than T2.
- the length of the lever in which the blow pipe 31 or tuyere 32 penetrating the portion is supported in a cantilever state can be shortened.
- the positional deviation on the inner surface can be reduced, which is effective for stable operation.
- the tuyere portion cooler 23 and omitting the inner refractory brick such as the tuyere unit brick 5 in FIG. 3
- the pushing up to the tuyere 32 due to thermal deformation of the brick can be suppressed. it can.
- the surface of the tuyere stave cooler 23 in this embodiment is a furnace inner surface, and this furnace inner surface is set along an appropriate profile as a blast furnace. For this reason, the surface of the tuyere part cooler 23 which is the furnace inner surface is maintained at the same position as the surface of the conventional tuyere part brick 5 (see FIG. 3).
- the thickness of the tuyere is reduced by moving the position of the iron skin 21 to the inside of the furnace than the position of the conventional iron skin 11, that is, by narrowing the tuyere part of the furnace body to a small diameter. Yes.
- a refractory filler 29 such as refractory mortar is filled in a gap between the furnace bottom stave cooler 22, the tuyere stave cooler 23, and the morning glory stave cooler 24.
- a sealing plate 291 is installed inside the tuyere insertion notch 231 and tuyere opening 211, and the refractory filler 29 filled inside the iron skin 21 is blocked by the sealing plate 291. Further, the space between the tuyere opening 211 and the blow pipe 31 is not filled, and this portion is maintained as a space.
- stretchable refractory materials 292 such as ceramic wool.
- assembly is performed according to the following procedure.
- a furnace shell outer shell is constructed with the iron skin 21, a furnace bottom stave cooler 22 and a hearth wall brick 25 are constructed on the inside, and a tuyere stave cooler 23 and a morning glory stave cooler 24 are constructed thereon. go.
- a refractory material 292 is stretched inside the cutout portion 231 of the tuyere portion cooler 23, and a seal plate 291 is installed inside the cutout portion 231 and the tuyere opening 211.
- the duesen stock 33, the flexible joint 34, the blow pipe 31 and the tuyere 32 are assembled outside the furnace, and the assembled duesen stock 33 or tuyere 32 is arranged immediately before the tuyere opening 211,
- the tuyere 32 or the blow pipe 31 is introduced into the furnace.
- the refractory material 292 is sandwiched between the notch 231 and the tuyere 32, and the tuyere 32 or the blow pipe 31 is disposed in the notch 231 for inserting the tuyere of the tuyere stave cooler 23,
- the tuyere 32 is projected from the tuyere stave cooler 23 into the furnace.
- the flange 311 of the blow pipe 31 is fixed around the tuyere opening 211.
- the refractory filler 29 filled inside the iron skin 21 is blocked by the seal plate 291 inside the notch 231 and the tuyere opening 211, so it is not filled around the blow pipe 31, Left in space.
- the seal plate 291 for example, a metal plate material or a plate material made of an elastomer material such as heat-resistant rubber can be used.
- the metal touch that has been conventionally used between the tuyere 32 and the blow pipe 31 can be eliminated, which is necessary for the metal touch.
- Spherical processing can be eliminated to reduce manufacturing costs, and gas leakage due to metal touch can be prevented.
- the blow pipe 31 to the iron skin 21 the position of the tuyere 32 fixed to the tip of the blow pipe 31 with respect to the iron skin 21, that is, the tip position of the tuyere 32 in the furnace body is maintained at a predetermined position. be able to.
- the flexible joint 34 between the blow pipe 31 and the duesen stock 33 the difference between the thermal deformation on the furnace body side and the thermal deformation on the annular tube side can be absorbed.
- gas leakage can be prevented, and the tip position of the tuyere 32 can be maintained at a predetermined position of the furnace body while absorbing the difference in thermal deformation between the furnace body side and the annular tube side.
- the conventional tuyere brick is omitted.
- the thickness of the furnace body can be reduced by the thickness, and the distance from the iron skin 21 to which the blow pipe 31 is fixed to the tuyere 32 can be shortened. If the distance between the iron skin 21 to which the blow pipe 31 is fixed and the tuyere 32 is large, the blow pipe 31 may become a cantilever and the position of the tuyere 32 may fluctuate.
- the conventional tuyere brick 5 (see FIG. 3) is omitted, and the tuyere stave cooler 23 is directly used as the furnace inner surface, thereby minimizing the length of the blow pipe 31. And fluctuations in the position of the tuyere 32 can be suppressed.
- a tuyere opening 211 is formed, and the entire circumference of the flange 311 formed on the outer periphery of the blow pipe 31 is joined to the tuyere opening 211.
- the blow pipe 31 can be fixed to the iron shell 21 in a predetermined posture, and gas leakage from the tuyere opening 211 can be prevented.
- joining by the bolts arranged at a predetermined interval on the flange 311 is used, so that attachment and detachment for maintenance work can be easily performed.
- the blow pipe 31 and the tuyere 32 are arranged in a substantially orthogonal direction with respect to the iron skin 21, but actually the tuyere 32 may be inclined downward toward the furnace bottom side.
- the tuyere 32 may be attached to the blow pipe 31 at an inclination, or the blow pipe 31 itself may be fixed to the iron skin 21 at an inclination.
- the tip of the blow pipe 31 is bent toward the furnace bottom, and the tuyere 32 connected to the tip is inclined toward the furnace bottom. is set up.
- a notch 231 formed in the tuyere stave cooler 23 is also tilted.
- the other configurations are the same as those in the embodiment shown in FIG.
- refractory blocks 232 and 242 for protecting each surface are installed in order to use each surface as a furnace inner surface.
- 242 is not limited to being simply arranged on the surface of each of the stave coolers 23, 24, and may be continuously spread.
- the refractory blocks 232 and 242 may be omitted if a sufficient protective performance can be obtained by forming a protective layer with a refractory coating on the surface of each of the stave coolers 23 and 24.
- the detailed shape, material dimensions, and the like of the present embodiment can be appropriately changed during implementation.
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Abstract
Description
大丸9を囲むように羽口部煉瓦5が配置される。羽口部煉瓦5は、大丸9を取り巻くように複数の煉瓦を組み合わせて形成される。高炉炉床部の炉底には炉底煉瓦が築造され、その上部の炉床壁部には炉床壁煉瓦7が築造される。羽口部煉瓦5は炉床壁煉瓦7の上に乗るような形で築造され、更に羽口部煉瓦5の上部には朝顔部煉瓦6が築造される。 As shown in FIG. 3, in the conventional blast furnace tuyere, the
The
ステーブクーラー1,1aには、内部に複数の冷却水パイプが配置され、冷却水配管15を経由して冷却水が供給される。冷却水配管を流れる冷却水によってステーブクーラー1,1aが冷却され、炉内側からの熱を遮断して鉄皮11を保護している。 The
A plurality of cooling water pipes are arranged inside the
このため、大丸9の下部と羽口部煉瓦5との間に可縮性モルタル層12を設け、炉床壁煉瓦7の熱膨張によって羽口部煉瓦5が上方に押し上げられた場合には、この可縮性モルタル層12が収縮することにより、押し上げられた羽口部煉瓦5から大丸9に過大な荷重がかかるのを防止している。 The
For this reason, when the
ブローパイプ17およびデューゼンストック18は、環状管とともに炉体の周囲に設置された図示しない炉体櫓によって支持されている。ブローパイプ17の先端は凸状球面とされ、羽口8内部のブローパイプ接続部分は凹部球面に形成され、これらにより球面ジョイントが構成されている。球面ジョイントを介して羽口8とブローパイプ17とを接続することで、これらの間の気密性を維持しつつ、相互の変位を許容することができる。 A
The
ブローパイプ17ないし環状管と、羽口8を含む炉体とを、互いに独立した状態で支持しておき、これらを球面ジョイントにより接続するのは、高温となる炉体の熱歪に対して、環状管側が熱変形をさほど受けない炉体櫓により支持されており、両者の熱変形の挙動が異なるためである。
ステーブクーラー1,1aの炉内側に保護用の煉瓦5,6,7が積まれるのは、主に火入れ初期の熱ショックの遮断および炉内の溶銑や滓からの損傷を防ぐためである。羽口部においては、羽口部煉瓦5およびステーブクーラー1aの厚みを貫通するために、鉄皮11から羽口8までの距離が長く、その分、ブローパイプ17も長く形成されていた。 In the configuration of FIG. 3 described above, the
The
The reason why the
しかし、球面ジョイントは、通気孔の周辺の球面によるメタルタッチで気密性を維持しているため、気密性が確保できるような球面を形成するために高精度な加工が必要となり、製造コストが上昇するという問題があるうえ、このようなメタルタッチを採用しても、高圧がかかった際にガス漏れが発生するという問題があった。
とくに、鉄皮11から羽口8までの距離が長く、その分ブローパイプ17も長く形成されていたため、ブローパイプ17がカンチレバーの状態で支持されることになり、その先端位置が変動しやすく、羽口8の球面ジョイントに対する密着状態を適切に維持することが難しくなる可能性がある。 As described above, when a spherical joint is used to connect the
However, since the spherical joint maintains airtightness by metal touch with the spherical surface around the vent hole, high-precision processing is required to form a spherical surface that can ensure airtightness, which increases manufacturing costs. In addition, there is a problem that even if such a metal touch is adopted, gas leakage occurs when high pressure is applied.
In particular, since the distance from the
しかし、羽口8およびこれを支持する大丸9は、保護用の煉瓦5で囲われており、ステーブクーラー1,1aから離れている。このため、大丸9が熱変形を生じ、この熱変形により羽口8の炉内側面における位置あるいは姿勢がずれることがある。
このような炉内側面における羽口8の位置ずれが生じると、高炉操業上重要な炉内レースウェイの円周方向の均一性が乱れ、安定的な操業(還元反応、荷下がり)が得られなくなるという問題もあった。 Further, the
However, the
If such a misalignment of the
このような本発明では、羽口をブローパイプの先端に固定することで、羽口とブローパイプとの間のメタルタッチを解消することができ、メタルタッチのために必要とされていた球面加工を解消して製造コストを低減できるとともに、メタルタッチに起因するガス漏れを防止することができる。
また、ブローパイプを鉄皮に固定することで、ブローパイプの先端に固定された羽口の鉄皮に対する位置、つまり炉体における羽口の先端位置を所定位置に維持することができる。
さらに、ブローパイプとデューゼンストックとの間にフレキシブルジョイントを介在させることで、炉体側の熱変形と環状管側の熱変形との相違を吸収することができる。
これらにより、ガス漏れを防止することができるとともに、炉体側と環状管側との熱変形の相違を吸収しつつ、羽口の先端位置を炉体の所定位置に維持することができる。 A tuyere structure of a blast furnace according to the present invention includes a blow pipe fixed to an iron skin, a tuyere fixed to a tip of the blow pipe, and a flexible joint that connects the blow pipe and duesen stock. It is characterized by that.
In the present invention, by fixing the tuyere to the tip of the blow pipe, the metal touch between the tuyere and the blow pipe can be eliminated, and spherical processing required for the metal touch is performed. The manufacturing cost can be reduced by eliminating the above, and gas leakage due to metal touch can be prevented.
Further, by fixing the blow pipe to the iron skin, the position of the tuyere fixed to the tip of the blow pipe relative to the iron skin, that is, the tip position of the tuyere in the furnace body can be maintained at a predetermined position.
Furthermore, by interposing a flexible joint between the blow pipe and the duesen stock, the difference between the thermal deformation on the furnace body side and the thermal deformation on the annular tube side can be absorbed.
As a result, gas leakage can be prevented, and the tip position of the tuyere can be maintained at a predetermined position of the furnace body while absorbing the difference in thermal deformation between the furnace body side and the annular tube side.
ブローパイプが固定される鉄皮と羽口との距離が大きいと、ブローパイプがカンチレバーとなって先端の羽口位置が変動する可能性がある。これに対し、本発明では、従来の羽口部煉瓦を省略し、ステーブクーラーを直接炉内面とすることで、ブローパイプの長さを最小限にすることができ、羽口位置の変動を抑制することができる。 In the present invention, it is preferable that a stave cooler is installed inside the iron skin around the tuyere and the stave cooler forms a furnace inner surface.
If the distance between the iron skin to which the blow pipe is fixed and the tuyere is large, the blow pipe becomes a cantilever and the tip tuyere position may change. In contrast, in the present invention, the conventional tuyere brick is omitted, and the stave cooler is directly used as the furnace inner surface, so that the length of the blow pipe can be minimized, and fluctuations in tuyere position are suppressed. can do.
接合にあたっては、保守作業のための着脱を行うことを考慮して、フランジに所定間隔で配置されたボルトによる接合を用いることが望ましい。 In the present invention, it is desirable that a tuyere opening is formed in the iron skin around the tuyere and the entire circumference of a flange formed on the outer periphery of the blow pipe is joined to the tuyere opening. .
In joining, it is desirable to use joining by bolts arranged at predetermined intervals on the flange in consideration of attachment / detachment for maintenance work.
図1に示すように、本実施形態の羽口部構造20は、鉄皮21に固定されたブローパイプ31と、ブローパイプ31の先端に固定された羽口32と、ブローパイプ31とデューゼンストック33とを接続するフレキシブルジョイント34とを備えている。
フレキシブルジョイント34としては、高炉内へ供給される高温で高圧の熱風が内部を通されることから、金属ベローズタイプのフレキシブルジョイントが用いられている。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the
As the flexible joint 34, a metal bellows type flexible joint is used because high-temperature and high-pressure hot air supplied into the blast furnace is passed through the inside.
ブローパイプ31は、羽口32とは反対側の端部にフランジを有し、このフランジにはフレキシブルジョイント34が接続されている。フレキシブルジョイント34は、ブローパイプ31と反対側の端部にフランジを有し、このフランジにはデューゼンストック33が接続されている。デューゼンストック33は、フレキシブルジョイント34と反対側の端部を図示しない環状管に接続されている。 A tuyere mounting flange is formed at the tip of the
The
なお、ブローパイプ31に対する羽口32の向きおよび位置は、炉内に配置された際に適切な数値となるように予め調整等しておく。 The
Note that the orientation and position of the
ブローパイプ31は、先端側(羽口32側)を羽口用開口211から炉内(図中左側)に挿入され、フランジ311が羽口用開口211を塞いだ状態とされている。
フランジ311と羽口用開口211の周囲とは、所定間隔でボルト締めすること等により、気密状態で接合されている。
これらのフランジ311と羽口用開口211の周囲との接合により、ブローパイプ31が鉄皮21に固定されている。 A
The
The
The
羽口部ステーブクーラー23は、羽口挿通用の切欠部231を有する。羽口用開口211を通して鉄皮21の内側に挿入されたブローパイプ31および羽口32は、この切欠部231に通され、羽口部ステーブクーラー23で囲まれるように配置される。 Inside the
The tuyere portion cooler 23 has a
羽口部ステーブクーラー23および朝顔部ステーブクーラー24の内側には、耐火煉瓦(図3の羽口部煉瓦5など)は築造されていない。代わりに、羽口部ステーブクーラー23および朝顔部ステーブクーラー24の炉内側面には、耐火物ブロック232,242が嵌め込まれている。
このような羽口部ステーブクーラー23を用いることで、本実施形態では、鉄皮21から炉内側面までの厚みT1が、図中一点鎖線で示す従来の鉄皮11から炉内側面までの厚みT2よりも薄くなっている。
そして、鉄皮21から炉内側面までの厚みT1が薄くなることで、当該部分を貫通するブローパイプ31ないし羽口32がカンチレバー状態で支持されるレバー長さを短くでき、羽口32の炉内側面における位置ずれを少なくすることができ、安定操業を行う上で有効である。
また、羽口部ステーブクーラー23を用い、内側の耐火煉瓦(図3の羽口部煉瓦5など)を省略することで、同煉瓦の熱変形に伴う羽口32への突き上げを抑制することができる。 A
No refractory bricks (such as the
By using such a tuyere stave cooler 23, in this embodiment, the thickness T1 from the
Further, by reducing the thickness T1 from the
Further, by using the tuyere portion cooler 23 and omitting the inner refractory brick (such as the
羽口挿通用の切欠部231および羽口用開口211の内側にはシール板291が設置され、鉄皮21の内側に充填される耐火物充填材29はシール板291で遮断され、切欠部231および羽口用開口211とブローパイプ31との間には充填されず、この部分は空間のまま維持される。
一方、切欠部231と羽口32との間には、セラミックウールなどの伸縮性の耐火材292に挟み込まれている。 Inside the
A sealing
On the other hand, between the
先ず、鉄皮21により炉体外郭を構築し、その内側に炉底部ステーブクーラー22および炉床壁煉瓦25を構築し、その上に羽口部ステーブクーラー23および朝顔部ステーブクーラー24を構築してゆく。
この際、羽口部ステーブクーラー23の切欠部231の内側には耐火材292を張っておくとともに、切欠部231および羽口用開口211の内側にシール板291を設置しておく。
次に、デューゼンストック33、フレキシブルジョイント34、ブローパイプ31および羽口32を炉外で組み立てておき、組み立てられたデューゼンストック33ないし羽口32を羽口用開口211の直前に配置し、羽口32ないしブローパイプ31を炉内へ導入する。
これにより、耐火材292が切欠部231と羽口32との間に挟み込まれるとともに、羽口32ないしブローパイプ31が羽口部ステーブクーラー23の羽口挿通用の切欠部231内に配置され、羽口32は羽口部ステーブクーラー23から炉内に突出した状態とされる。
この状態で、ブローパイプ31のフランジ311を、羽口用開口211の周囲に固定する。
これらの処置ができたら、鉄皮21の内側に耐火物充填材29を充填する。
以上により、羽口部構造が完成する。 In this embodiment, assembly is performed according to the following procedure.
First, a furnace shell outer shell is constructed with the
At this time, a
Next, the
Thereby, the
In this state, the
When these treatments are completed, the
Thus, the tuyere structure is completed.
この空間の確保により、操業中に羽口が損耗した場合、熱風を停止したのちフレキシブルジョイント34を取り外し、続いてブローパイプ31と羽口32とを鉄皮31の外まで引き出し、羽口32を容易に交換することができる。
なお、シール板291としては、例えば金属製の板材や、耐熱ゴム等のエラストマ材料を板状にしたものが利用できる。 Note that the
By securing this space, if the tuyere is worn out during operation, the hot air is stopped and then the flexible joint 34 is removed. Subsequently, the
As the
羽口32をブローパイプ31の先端に固定することで、羽口32とブローパイプ31との間に従来用いられていたメタルタッチを解消することができ、メタルタッチのために必要とされていた球面加工を解消して製造コストを低減できるとともに、メタルタッチに起因するガス漏れを防止することができる。
また、ブローパイプ31を鉄皮21に固定することで、ブローパイプ31の先端に固定された羽口32の鉄皮21に対する位置、つまり炉体における羽口32の先端位置を所定位置に維持することができる。
さらに、ブローパイプ31とデューゼンストック33との間にフレキシブルジョイント34を介在させることで、炉体側の熱変形と環状管側の熱変形との相違を吸収することができる。
これらにより、ガス漏れを防止することができるとともに、炉体側と環状管側との熱変形の相違を吸収しつつ、羽口32の先端位置を炉体の所定位置に維持することができる。 According to this embodiment, there are the following effects.
By fixing the
Further, by fixing the
Furthermore, by interposing the flexible joint 34 between the
As a result, gas leakage can be prevented, and the tip position of the
ブローパイプ31が固定される鉄皮21と羽口32との距離が大きいと、ブローパイプ31がカンチレバーとなって羽口32の位置が変動する可能性がある。これに対し、本実施形態では、従来の羽口部煉瓦5(図3参照)を省略し、羽口部ステーブクーラー23を直接炉内面とすることで、ブローパイプ31の長さを最小限にすることができ、羽口32の位置の変動を抑制することができる。 Since the tuyere stave cooler 23 is installed inside the
If the distance between the
フランジ311と羽口用開口211との接合にあたっては、フランジ311に所定間隔で配置されたボルトによる接合を用いたため、保守作業のための着脱を容易に行うことができる。 In the
In joining the
例えば、前記実施形態では、ブローパイプ31および羽口32が鉄皮21に対してほぼ直交方向に配置されているが、実際には羽口32を炉底側に向けて下向きに傾斜させることが多い。このために、ブローパイプ31に対して羽口32を傾斜させて取り付けてもよく、あるいはブローパイプ31自体が鉄皮21に対して傾斜して固定されるように構成してもよい。 Note that the present invention is not limited to the above-described embodiment, and modifications and the like within a scope not departing from the object of the present invention are included in the present invention.
For example, in the above-described embodiment, the
その他、本実施形態の細部形状や材質寸法などは、実施にあたって適宜変更しうるものである。 In the tuyere portion cooler 23 and the morning glory portion stave cooler 24,
In addition, the detailed shape, material dimensions, and the like of the present embodiment can be appropriately changed during implementation.
21…鉄皮
211…羽口用開口
22…炉底部ステーブクーラー
23…羽口部ステーブクーラー
231…切欠部
232…耐火物ブロック
24…朝顔部ステーブクーラー
25…炉床壁煉瓦
29…耐火物充填材
291…シール板
292…耐火材
31…ブローパイプ
311…フランジ
32…羽口
33…デューゼンストック
34…フレキシブルジョイント 20 ...
Claims (3)
- 鉄皮に固定されたブローパイプと、前記ブローパイプの先端に固定された羽口と、前記ブローパイプとデューゼンストックとを接続するフレキシブルジョイントとを備えたことを特徴とする高炉の羽口部構造。 A blast furnace tuyere having a blow pipe secured to an iron skin, a tuyere fixed to the tip of the blow pipe, and a flexible joint for connecting the blow pipe and duesen stock Construction.
- 請求項1に記載の高炉の羽口部構造において、
前記羽口の周辺の前記鉄皮の内側にはステーブクーラーが設置されるとともに、前記ステーブクーラーが炉内面を形成することを特徴とする高炉の羽口部構造。 In the blast furnace tuyeres structure according to claim 1,
A blast furnace tuyere structure, wherein a stave cooler is installed inside the iron skin around the tuyere and the stave cooler forms a furnace inner surface. - 請求項1または請求項2に記載の高炉の羽口部構造において、
前記羽口の周辺の前記鉄皮には羽口用開口が形成され、前記ブローパイプの外周に形成されたフランジの全周が前記羽口用開口と接合されていることを特徴とする高炉の羽口部構造。 In the tuyere structure of a blast furnace according to claim 1 or claim 2,
A blast furnace is characterized in that a tuyere opening is formed in the iron skin around the tuyere and the entire circumference of a flange formed on the outer periphery of the blow pipe is joined to the tuyere opening. The tuyere structure.
Priority Applications (6)
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RU2014150065/02A RU2563069C1 (en) | 2012-05-11 | 2013-05-10 | Blast furnace tuyere unit |
CN201380024254.0A CN104271774A (en) | 2012-05-11 | 2013-05-10 | Structure for tuyere section in blast furnace |
KR1020147031978A KR101789558B1 (en) | 2012-05-11 | 2013-05-10 | Structure for tuyere section in blast furnace |
BR112014028084A BR112014028084B8 (en) | 2012-05-11 | 2013-05-10 | STRUCTURE OF A BLAST FURNACE TUFF |
EP13788617.2A EP2848705B1 (en) | 2012-05-11 | 2013-05-10 | Structure for tuyere section in blast furnace |
JP2014514755A JP5702889B2 (en) | 2012-05-11 | 2013-05-10 | Blast furnace tuyere structure |
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JP2012110071 | 2012-05-11 |
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JP (1) | JP5702889B2 (en) |
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WO2022058771A1 (en) * | 2020-09-15 | 2022-03-24 | Arcelormittal | Device to inject a reducing gas into a shaft furnace |
CN115404294A (en) * | 2022-08-30 | 2022-11-29 | 中国一冶集团有限公司 | Blast furnace tuyere big sleeve installation aligning device |
CN115867679A (en) * | 2020-09-15 | 2023-03-28 | 安赛乐米塔尔公司 | Blast furnace for iron-smelting production |
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JP7133948B2 (en) * | 2018-03-06 | 2022-09-09 | 黒崎播磨株式会社 | Tuyere installation structure |
LU102096B1 (en) * | 2020-09-28 | 2022-03-29 | Wurth Paul Sa | Exchangeable cooled nose with ceramic injector passage |
LU102097B1 (en) * | 2020-09-28 | 2022-03-29 | Wurth Paul Sa | Reducing gas injection System |
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WO2022058771A1 (en) * | 2020-09-15 | 2022-03-24 | Arcelormittal | Device to inject a reducing gas into a shaft furnace |
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CN115404294B (en) * | 2022-08-30 | 2023-07-18 | 中国一冶集团有限公司 | Blast furnace tuyere large sleeve mounting and aligning device |
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BR112014028084B8 (en) | 2023-04-18 |
BR112014028084A2 (en) | 2017-06-27 |
EP2848705A4 (en) | 2016-01-20 |
CN104271774A (en) | 2015-01-07 |
BR112014028084B1 (en) | 2023-01-24 |
JPWO2013168784A1 (en) | 2016-01-07 |
EP2848705A1 (en) | 2015-03-18 |
KR101789558B1 (en) | 2017-11-20 |
RU2563069C1 (en) | 2015-09-20 |
EP2848705B1 (en) | 2019-03-20 |
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JP5702889B2 (en) | 2015-04-15 |
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