WO2012120691A1 - Hot-blast branch pipe structure of blast furnace hot stove and hot-blast branch pipe - Google Patents

Hot-blast branch pipe structure of blast furnace hot stove and hot-blast branch pipe Download PDF

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Publication number
WO2012120691A1
WO2012120691A1 PCT/JP2011/056121 JP2011056121W WO2012120691A1 WO 2012120691 A1 WO2012120691 A1 WO 2012120691A1 JP 2011056121 W JP2011056121 W JP 2011056121W WO 2012120691 A1 WO2012120691 A1 WO 2012120691A1
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WO
WIPO (PCT)
Prior art keywords
hot air
air branch
branch pipe
hot
blast furnace
Prior art date
Application number
PCT/JP2011/056121
Other languages
French (fr)
Japanese (ja)
Inventor
亮 濱田
昌男 藤田
泰光 古川
Original Assignee
Ｊｆｅスチール株式会社
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to KR1020137022346A priority Critical patent/KR101445516B1/en
Priority to CN201180068978.6A priority patent/CN103415629B/en
Priority to PCT/JP2011/056121 priority patent/WO2012120691A1/en
Publication of WO2012120691A1 publication Critical patent/WO2012120691A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast furnaces
    • C21B9/10—Other details, e.g. blast mains
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/32—Technologies related to metal processing using renewable energy sources

Definitions

  • the present invention relates to a hot air branch pipe in a hot blast furnace of a blast furnace, and is particularly suitable for a hot air branch pipe part connecting a hot blast furnace main body and a hot air main pipe connected to an annular pipe of the blast furnace.
  • Hot blast furnaces which are ancillary equipment for blast furnaces, are used to heat and raise the air blown from the tuyere, and are roughly divided into small internal combustion hot blast furnaces and large external combustion hot blast furnaces.
  • the heat storage chamber and the combustion chamber are separated, and the upper dome is connected to each other.
  • this connection structure is provided with an expansion joint having a bellows structure called a bellows so as to absorb the difference in thermal displacement generated in the heat storage chamber and the combustion chamber or the thermal displacement itself generated in the connection structure itself.
  • a tension beam for taking a so-called reaction force is generally used for the use part of the expansion joint.
  • connection structure of an external combustion type hot stove that can connect a heat storage chamber and a combustion chamber without using an expansion joint, as described in Patent Document 1 below.
  • the ratio RD / TD between the pipe diameter RD of the connecting pipe and the dome diameter TD of the heat storage chamber is 0.24 or more and 0.60 or less.
  • the ratio RD / TD of the pipe diameter RD of the connecting pipe and the dome diameter ND of the combustion chamber is 0.44 or more and 0.60 or less, the drift of the gas in the furnace is prevented and the local knuckle portion of the connecting pipe is locally Therefore, it was possible to connect the heat storage chamber and the combustion chamber without expansion joints.
  • a hot air branch pipe In a hot air furnace, there is also a connecting portion between a combustion chamber (including a heat storage chamber integrated) and a hot air main pipe, a so-called hot air branch pipe, and this hot air branch pipe also absorbs the difference in thermal displacement and the thermal displacement itself. Since the expansion joint is used and the tension beam used to take the so-called reaction force is used at the location where the expansion joint is used, the structure becomes complicated, the iron skin becomes red hot, There is a problem that the expansion joint itself is damaged.
  • the present invention has been made paying attention to the above problems, and provides a hot air branch pipe construction method for a hot blast furnace of a blast furnace that can eliminate the need for an expansion joint and avoid various problems related to the expansion joint. It is intended to do.
  • a hot air branch construction method for a hot blast furnace of the blast furnace includes a hot air branch pipe vertical portion interposed between a hot air main pipe connected to an annular pipe of the blast furnace and the hot blast furnace body.
  • the vertical section of the hot blast branch with respect to the thermal expansion difference ⁇ at the time of heating and drying of the hot blast furnace between the hot blast furnace main body and the vertical section of the hot blast
  • the hot air branch pipe vertical part is supported by a height-adjustable support, and after the initial installation of the hot air branch pipe vertical part, the hot air branch pipe vertical part is lowered to connect the hot air branch pipe vertical part and the hot air furnace main body. After connecting the vertical part of the hot air branch pipe and the main body of the hot air furnace with the horizontal part of the upper part of the hot air branch pipe with the same height, the hot air furnace body and the vertical part of the hot air branch pipe during the temperature rise of the hot air furnace are heated according to the thermal expansion. The height of the vertical portion of the hot air branch pipe is adjusted.
  • the height of the vertical portion of the hot air branch pipe is adjusted, and the actual thermal expansion difference ⁇ between the thermal expansion difference ⁇ and the thermal expansion difference absorption margin ⁇ is changed to the hot air branch upper horizontal portion and the hot air. It is characterized in that it is divided equally or almost equally with the horizontal part of the lower part of the branch pipe.
  • the hot air branch pipe vertical part and the hot air furnace main body are connected by the hot air branch pipe upper horizontal part, the hot air branch pipe vertical part is raised and the hot air branch pipe lower horizontal part is leveled in the hot air branch lower part horizontal part. Brick is stacked, and then the hot air branch pipe upper horizontal portion is lowered and the hot air branch pipe upper horizontal portion is leveled, and bricks are stacked in the hot air branch upper horizontal portion.
  • a hot air branch pipe of a hot blast furnace of the blast furnace includes a hot air branch vertical section and a hot air branch pipe interposed between a hot air main pipe connected to an annular pipe of the blast furnace and the hot blast furnace main body.
  • the hot air branch pipe having a horizontal portion the length of the vertical portion and the horizontal portion of the hot air branch pipe is set to be three times or more of the respective pipe diameters.
  • the length of a vertical part and a horizontal part is the length between centerlines of each pipe
  • the hot air in the vertical part of the hot air branch is against the thermal expansion difference ⁇ at the time of drying in the hot air furnace between the hot blast furnace body and the vertical part of the hot air branch.
  • the vertical part of the hot air branch pipe is supported by a height-adjustable support, and after the initial installation of the vertical part of the hot air branch pipe, the vertical part of the hot air branch pipe is lowered so that the connecting portion between the vertical part of the hot air branch pipe and the main body of the hot air furnace is the same.
  • the vertical part of the hot air branch pipe After connecting the vertical part of the hot air branch pipe and the main body of the hot air branch at the upper horizontal part of the hot air branch pipe at a height, the vertical part of the hot air branch pipe according to the thermal expansion of the hot air furnace body and the vertical part of the hot air branch pipe during the temperature rise of the hot air furnace
  • the difference in thermal expansion that occurs during the hot air oven drying temperature rise can be shared, for example, by the upper horizontal part and the lower horizontal part of the hot air branch pipe, thereby enabling the difference in thermal displacement and the thermal displacement. It can absorb itself.
  • the height of the vertical section of the hot air branch pipe is adjusted to obtain the actual thermal expansion difference ⁇ - ⁇ between the thermal expansion difference ⁇ and the thermal expansion difference absorption margin ⁇ .
  • the vertical section of the hot air branch pipe is raised and the horizontal portion of the lower portion of the hot air branch pipe is leveled, and the brick is placed in the lower horizontal section of the hot air branch
  • Stacking bricks in the upper horizontal part of the hot air branch pipe and the horizontal part of the lower part of the hot air branch pipe is easy by lowering the vertical part of the hot air branch pipe and then placing the brick in the upper horizontal part of the hot air branch pipe in the state where the upper horizontal part of the hot air branch pipe is leveled.
  • the length of the vertical part and the horizontal part of the hot air branch pipe is set to be three times or more of the respective pipe diameters, Even if thermal displacement itself occurs, it can be absorbed by elastic deformation of the tube itself. As a result, it is not necessary to use an expansion joint, and various problems associated with the expansion joint can be avoided.
  • FIGS. 1 to 6 are all process diagrams of the hot air branch construction method for a hot stove according to the present embodiment.
  • the hot stove of this embodiment is a top-fired hot stove in which a so-called combustion chamber and a heat storage chamber are integrated.
  • Reference numeral 1 in the figure denotes a hot stove body.
  • symbol 2 in a figure is a hot-air main pipe connected to the annular pipe of a blast furnace.
  • the hot air branch pipe 3 refers to a connecting pipe structure from the hot air furnace main body 1 to the hot air main pipe 2.
  • the outer shell of the hot-blast furnace main body 1, the hot-air branch pipe 3, and the hot-air main pipe 2 is covered with a so-called iron skin, it is necessary to load a brick for protecting the iron skin inside. Brick needs to be stacked in a special way that can absorb thermal expansion and contraction.
  • the hot air branch pipe construction method of the present invention can also be applied to a conventional external combustion type hot air furnace, in which case the hot air branch pipe disposed between the combustion chamber of the hot air furnace and the hot air main pipe is an object. Thus, the difference in thermal expansion described later is for the combustion chamber.
  • FIG. 1 is a first process diagram showing an initial installation state of a hot air branch pipe lower horizontal part 4 and a hot air branch pipe vertical part 5 of the hot air branch pipe 3.
  • the hot air branch lower horizontal part 4 is supported by a support 7 and connected to the hot air main pipe 2.
  • the hot air branch vertical part 5 is supported by a jack (support) 9 on the gantry 8, and the lower end part is connected to the hot air branch lower horizontal part 4.
  • the jack 9 is for adjusting the height of the hot air branch pipe vertical part 5. At this time, the hot air branch pipe lower horizontal part 4 is horizontal.
  • the height of the connection location of the hot air branch pipe vertical portion 5 to the hot air furnace main body 1 is higher than the height of the connection portion of the hot air furnace main body 1 to the hot air branch vertical portion 5 by the thermal expansion difference absorption margin ⁇ .
  • Initial installation to be This thermal expansion difference absorption margin ⁇ is set to 0.2 to 1.0 times the thermal expansion difference ⁇ between the hot stove main body 1 and the hot air branch pipe vertical portion 5.
  • Both the hot blast furnace main body 1 and the hot air branch vertical section 5 are of ordinary temperature at the time of construction, but the temperature rises to about 100 ° C. (the hot air temperature is higher) due to the action of the internal bricks at the time of drying and heating described later.
  • the hot stove main body 1 is longer in the height direction (higher in height) than the hot air branch vertical portion 5. Therefore, the amount of thermal expansion in the height direction when the temperature of the drying is increased is larger in the hot stove body 1 than that in the hot air branch vertical portion 5.
  • the difference in the amount of thermal expansion in the height direction is defined as a thermal expansion difference ⁇ .
  • the height of the connecting portion of the hot air branch pipe vertical portion 5 to the hot air furnace main body 1 is higher than the height of the connecting portion of the hot air furnace main body 1 to the hot air branch vertical portion 5 by the thermal expansion difference absorption margin ⁇ .
  • the hot air branch pipe vertical portion 5 is lowered by the thermal expansion difference absorption margin ⁇ with a jack 9, and the connecting portion between the hot air branch pipe vertical portion 5 and the hot stove main body 1 is the same.
  • both are connected in a horizontal state by the hot air branch upper horizontal portion 6. For example, if it is from this state, even if the hot-blast furnace main body 1 side of the hot-air branch pipe upper horizontal part 6 raises to the state of FIG. 6, for example, an internal stress will not become so large.
  • FIG. 2 The state of FIG. 2 is incomplete as a hot stove. This is because, for example, bricks are not stacked in the hot air branch lower horizontal part 4 or the hot air branch upper horizontal part 6. In general, from the viewpoint of strength and workability, bricks are first stacked in the hot air branch lower horizontal portion 4, and bricks are subsequently stacked in the hot air branch upper horizontal portion 5. Therefore, in the present embodiment, as shown in FIG. 3, the hot air branch pipe vertical portion 5 is raised again by the thermal expansion difference absorption margin ⁇ by the jack 9, and the hot air branch pipe lower horizontal portion 4 is brought into a horizontal state, and in this state, A brick is piled in the horizontal part 4 at the lower part of the hot air branch pipe.
  • the hot air branch vertical portion 5 is lowered again by the thermal expansion difference absorption margin ⁇ with a jack 9, and the hot air branch upper horizontal portion 6 is lowered. It is set as a horizontal state, and the brick is piled in the said hot air branch pipe upper horizontal part 6 in the state.
  • the hot air branch upper horizontal portion 6 is in a horizontal state as in the state of FIG. 2, and the internal stress is zero or almost zero. Therefore, it shifts from this state to the drying temperature rise of the hot stove.
  • both the hot stove main body 1 and the hot air branch pipe vertical portion 5 become longer in the height direction due to thermal expansion.
  • the hot stove main body 1 is not only long because the lower end portion is grounded, but the hot air branch vertical portion 5 is not only the upper portion but also supports the support portion of the jack 9. As it becomes longer downward.
  • the jack 9 adjusts the height of the hot air branch vertical portion 5 so that the internal stress of the hot air branch lower horizontal portion 4 and the hot air branch upper horizontal portion 6 does not become too large. Like that.
  • the height of the hot air branch vertical portion 5 is adjusted by the jack 9, and the hot air main pipe 2 side and the hot air branch vertical portion 5 side of the hot air branch lower horizontal portion 4 as shown in FIG.
  • the difference in height is half the actual thermal expansion difference ( ⁇ ) / 2
  • the difference in height between the hot air furnace main body 1 side and the hot air branch vertical part 5 side of the hot air branch upper horizontal part 6 is the actual thermal expansion difference.
  • Half ( ⁇ ) / 2 that is, by making the actual thermal expansion difference ⁇ equal or almost equally divided between the hot air branch upper horizontal portion 6 and the hot air branch lower horizontal portion 4
  • the difference in displacement or the thermal displacement itself can be absorbed as much as possible, and the internal stress of the hot air branch upper horizontal portion 6 and the internal stress of the hot air branch lower horizontal portion 4 can be minimized simultaneously.
  • the inventor sets the length of the vertical part and the horizontal part constituting the hot air branch pipe to be three times or more of the diameters of the hot air branch pipes, and the difference in thermal displacement that occurs when the temperature of the drying is increased.
  • the length of the hot air branch horizontal portions 4 and 6 may be three or more times the tube diameter of the hot air branch horizontal portions 4 and 6, and can be made longer depending on the position of the hot air furnace main body and the hot air furnace main.
  • the length of the vertical portion and a horizontal portion which constitutes the hot air branch pipe when less than three times of their pipe diameter, the analysis results by the finite element method when adding pressure and thermal expansion in a hot air furnace blast of 5000 m 3
  • the largest stress generated in the connecting portion between the hot air branch upper horizontal portion 6 and the hot air branch vertical portion 5 can be suppressed to 210 N / mm 2 and within the allowable fatigue endurance stress.
  • the hot air branch pipe construction method of this embodiment is used in combination, the stress generated at the connecting portion between the hot air branch upper horizontal part 6 and the hot air branch vertical part 5 can be reduced to 140 N / mm 2 , Without using it, the internal stress generated in the hot air branch pipe 3 can be greatly reduced.
  • the hot air branch vertical part 5 with respect to the difference in thermal expansion ⁇ between the hot air furnace main body 1 and the hot air branch vertical part 5 at the time of hot air furnace drying temperature rise.
  • ⁇ 0.2 ⁇ to ⁇
  • the hot air branch pipe vertical portion 5 is supported by a jack 9, and after the initial installation of the hot air branch pipe vertical portion 5, the hot air branch pipe vertical portion 5 is moved down so that the hot air branch pipe vertical portion 5 and the hot air furnace main body 1 are connected. After the hot air branch pipe vertical part 5 and the hot air furnace main body 1 are connected to each other by the hot air branch pipe upper horizontal part 6 at the same height, the hot air furnace body 1 and the hot air branch pipe vertical part 5 undergo thermal expansion during the hot air furnace drying temperature rise. Accordingly, by adjusting the height of the hot air branch vertical part 5, the difference in thermal expansion that occurs during the hot air oven drying temperature rise can be shared by the hot air branch upper horizontal part 6 and the lower horizontal part 4. The difference in thermal displacement and the thermal displacement itself can be absorbed.
  • the height of the hot air branch pipe vertical portion 5 is adjusted so that the actual thermal difference ⁇ between the thermal expansion difference ⁇ and the thermal expansion difference absorption margin ⁇ is changed to the hot air branch upper horizontal portion 6 and the hot air.
  • the difference in thermal displacement and the thermal displacement itself can be absorbed as much as possible.
  • the hot air branch pipe vertical part 5 is raised and the hot air branch lower part horizontal part 4 is leveled.
  • 1 is a hot-blast furnace main body
  • 2 is a hot-air main pipe
  • 3 is a hot-air branch pipe
  • 4 is a hot-air branch pipe lower horizontal part
  • 5 is a hot-air branch pipe vertical part
  • 6 is a hot-air branch pipe upper horizontal part
  • 7 is a support
  • 8 is a mount
  • 9 is Jack [Embodiment 2]
  • FIG. 7 is an overall view of the hot air branch pipe structure of the hot stove of the present embodiment.
  • Reference numeral 11 in the figure denotes a heat storage chamber
  • reference numeral 12 denotes a combustion chamber.
  • symbol 18 in a figure is a hot-air main pipe connected to the annular pipe of a blast furnace.
  • the hot air branch pipe 14 refers to a connecting pipe structure from the combustion chamber 12 to the hot air main pipe 18.
  • an expansion joint is not used at the connecting portion between the heat storage chamber 11 and the combustion chamber 12.
  • each of the heat storage chamber 11, the combustion chamber 12, the hot air branch pipe 14, and the hot air main pipe 18 is covered with a so-called iron skin, but a brick for protecting the iron skin is stacked inside. Brick is specially stacked to absorb thermal expansion and contraction.
  • the hot air branch pipe 14 of this embodiment includes a hot air branch first horizontal portion 15 connected to the combustion chamber 12, a hot air branch vertical portion 16 connected to the hot air branch first horizontal portion 15, a hot air branch vertical portion 16 and a hot air main pipe. And a hot-air branch pipe second horizontal portion 17 that connects to the first and second horizontal portions 17.
  • Each part of the hot air branch pipe 14 is heated only from a normal temperature at the time of construction to about 100 ° C. at the time of operation by bricks stacked inside, but a difference in thermal displacement due to thermal deformation or a thermal mutation itself occurs. . Therefore, conventionally, as shown in FIG. 9, the expansion joint A is used for the hot air branch first horizontal portion 15 and the hot air branch second horizontal portion 17 to absorb them. Further, a tension beam 13 for taking the reaction force is also provided at the site where the expansion joint A is used.
  • the length of the hot air branch first horizontal portion 15 is set to be not less than three times the diameter of the hot air branch first horizontal portion 15 and the length of the hot air branch vertical 16 is longer. Is set to at least three times the tube diameter of the hot air branch pipe vertical portion 16, and the length of the hot air branch pipe second horizontal portion 17 is set to be at least three times the tube diameter of the hot air branch pipe second horizontal portion 17. It was set as the structure which does not use.
  • Each tube diameter indicates the outer diameter of the tube portion.
  • each length shows the distance between the intersections of the centerline in the connection location with the pipe part to connect.
  • the length of the hot air branch vertical 16 is preferably not less than 3 times and not more than 6 times the tube diameter of the hot air branch vertical part 16. It is more desirable to be 5 times or more and 5.5 times or less.
  • the length of the hot air branch first horizontal portion 15 may be three times or more the tube diameter of the hot air branch first horizontal portion 15 and can be made longer depending on the positions of the hot air furnace main body and the hot air furnace main.
  • the length of the hot air branch second horizontal portion 17 may be three times or more the tube diameter of the hot air branch second horizontal portion 17 and can be made longer depending on the positions of the hot air furnace main body and the hot air furnace main.
  • the tube diameter By satisfying such a diameter and length of the tube diameter, for example, the difference between the thermal displacement of the hot air branch first horizontal portion 15 and the heat displacement of the hot air branch second horizontal portion 17 and the hot air branch vertical portion 16 itself.
  • the heat displacement itself can be absorbed by the elastic deformation of the hot air branch pipe vertical portion 16, and as a result, the expansion joint is not required.
  • it is an analysis result by a finite element method when internal pressure and thermal expansion are applied in a hot blast furnace of a 5,000 m 3 blast furnace.
  • the largest stress is applied to the connecting portion between the hot air branch first horizontal portion 15 and the hot air branch vertical portion 16. Although it was found that this occurred, the magnitude was 210 N / mm 2 , which was within the tolerance of fatigue endurance stress.
  • FIG. 7 shows a so-called best mode in which the expansion joint is not used in the connecting portion between the heat storage chamber 11 and the combustion chamber 12 using the technique described in Patent Document 1, but the hot blast furnace of the blast furnace according to the present invention.
  • the expansion joint In the hot air branch pipe structure, it is not necessarily assumed that the expansion joint is not used.
  • the expansion joint A and the tension beam 13 are used for the hot air branch second horizontal portion 17.
  • the expansion joint A and the tension beam 13 are used in the hot air branch first horizontal portion 15.
  • FIG. 8 c the expansion joint A and the tension beam 13 are used at the connecting portion between the heat storage chamber 11 and the combustion chamber 12. Further, in FIG.
  • the expansion joint A and the tension beam 13 are used for the connecting portion of the heat storage chamber 11 and the combustion chamber 12 and the hot air branch first horizontal portion 15. Further, in FIG. 8 e, the expansion joint A and the tension beam 13 are used for the connecting portion of the heat storage chamber 11 and the combustion chamber 12 and the hot air branch second horizontal portion 17.
  • the length of the hot air branch first horizontal portion 15 is three times or more the diameter of the hot air branch first horizontal portion 15 and the length of the hot air branch vertical 16 is the hot air branch vertical portion. 6 and the length of the hot air branch second horizontal portion 17 is three times or more the tube diameter of the hot air branch second horizontal portion 17. Therefore, in each pipe part constituting the hot air branch pipe 14, since the difference in thermal displacement and the thermal displacement itself can be absorbed by its own elastic deformation, even if an expansion joint is used, the load on the expansion joint is small. Further, since deformation (displacement) is small, it does not become a big problem as in the conventional case.
  • the length of the vertical portion 16 and the horizontal portions 15 and 17 of the hot air branch tube 14 is set to be three times or more of the respective tube diameters. Even if a difference in displacement or a thermal displacement itself occurs, it can be absorbed by elastic deformation of the tube itself. As a result, it is not necessary to use an expansion joint, and various problems related to the expansion joint can be avoided. [Explanation of symbols]
  • 11 is a heat storage chamber
  • 12 is a combustion chamber
  • 13 is a tension beam
  • 14 is a hot air branch pipe
  • 15 is a hot air branch pipe first horizontal part
  • 16 is a hot air branch pipe vertical part
  • 17 is a hot air branch pipe second horizontal part
  • 18 is a hot air main pipe
  • A is an expansion joint

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Abstract

Provided is a method for constructing a hot-blast branch pipe of a blast furnace hot stove that eliminates the need for expansion joints in order to avoid expansion-joint-related problems of various kinds. In consideration of the thermal expansion difference (δ) between a blast furnace body (1) and an upright hot-blast branch pipe section (5) when the temperature of the blast furnace is increased in a dry state, the height of the connecting position of upright hot-blast branch pipe section (5) to the blast furnace body (1) is set higher than the height of the connecting position of the blast furnace body (1) to the upright hot-blast branch pipe section (5) by the thermal expansion difference absorption margin of σ = 0.26δ - δ during the initial installation. By setting the respective lengths of the upright section and horizontal sections of the hot-blast branch pipe three or more times greater than the respective pipe diameters, differences in thermal displacement and the thermal displacements themselves can be absorbed by means of elastic deformation of the pipes themselves. As a result, there is no longer any need for the use of any expansion joints, so expansion-joint-related problems of various kinds can be avoided.

Description

高炉の熱風炉の熱風支管構築方法及び熱風支管Hot air branch construction method and hot air branch pipe of blast furnace
　本発明は、高炉の熱風炉における熱風支管に関し、特に熱風炉本体と高炉の環状管に接続される熱風本管とを連結する熱風支管部分に好適なものである。 The present invention relates to a hot air branch pipe in a hot blast furnace of a blast furnace, and is particularly suitable for a hot air branch pipe part connecting a hot blast furnace main body and a hot air main pipe connected to an annular pipe of the blast furnace.
　高炉の付帯設備である熱風炉は、羽口からの送風を加熱昇温するためのものであり、小型の内燃式熱風炉と大型の外燃式熱風炉に大別される。外燃式熱風炉は、蓄熱室と燃焼室が分離していて、上部のドーム同士が連結されている。この連結構造は、従来、ベローと呼ばれる蛇腹構造からなる伸縮継手を介装し、蓄熱室及び燃焼室に生じる熱変位の差或いは連結構造自体に生じる熱変位そのものを吸収するようにしている。なお、伸縮継手の使用部には、所謂反力をとるためのテンションビームが一般的に用いられる。また、熱風炉の外殻を構成する鉄皮を熱風の高温から保護するためには、鉄皮の内側にレンガを積む必要がある。このレンガ積みは、熱風炉内のみならず、熱風が通過する全ての部位に積む必要がある。 Hot blast furnaces, which are ancillary equipment for blast furnaces, are used to heat and raise the air blown from the tuyere, and are roughly divided into small internal combustion hot blast furnaces and large external combustion hot blast furnaces. In the external combustion type hot stove, the heat storage chamber and the combustion chamber are separated, and the upper dome is connected to each other. Conventionally, this connection structure is provided with an expansion joint having a bellows structure called a bellows so as to absorb the difference in thermal displacement generated in the heat storage chamber and the combustion chamber or the thermal displacement itself generated in the connection structure itself. In addition, a tension beam for taking a so-called reaction force is generally used for the use part of the expansion joint. Moreover, in order to protect the iron skin which comprises the outer shell of a hot-blast furnace from the high temperature of a hot air, it is necessary to pile a brick inside an iron skin. It is necessary to pile up this brickwork not only in the hot air furnace but also in all parts through which the hot air passes.
　しかしながら、蛇腹構造からなる伸縮継手では、レンガ積みが非常に複雑で困難である。また、伸縮が生じる箇所では、その伸縮を吸収するように、レンガ同士に隙間を空けて積む必要があり、長年にわたって伸縮を繰り返す伸縮継手部位では、レンガが摩耗、脱落し、鉄皮が赤熱するという問題が生じる。また、伸縮継手の蛇腹部自体も応力腐食割れによって破損するという問題もある。 However, brick expansion is very complicated and difficult with an expansion joint having a bellows structure. In addition, at locations where expansion and contraction occurs, it is necessary to stack with a gap between the bricks so as to absorb the expansion and contraction, and at expansion joints that repeatedly expand and contract over many years, the bricks wear and fall off, and the iron skin becomes red hot The problem arises. There is also a problem that the bellows portion of the expansion joint itself is damaged by stress corrosion cracking.
　そこで、本出願人は、先に下記特許文献１に記載されるように、伸縮継手を用いることなく蓄熱室と燃焼室を連結することが可能な外燃式熱風炉の連結構造を提案した。この連結構造は、蓄熱室のドームと燃焼室のドームを連結管で連結する場合、連結管の管径ＲＤと蓄熱室のドーム径ＴＤの比ＲＤ／ＴＤを０．２４以上０．６０以下とし、連結管の管径ＲＤと燃焼室のドーム径ＮＤの比ＲＤ／ＴＤを０．４４以上０．６０以下とすることにより、炉内ガスの偏流を防止し且つ連結管付け根ナックル部の局所的な応力を抑制して、伸縮継手なしに蓄熱室と燃焼室を連結することを可能とした。 Therefore, the present applicant has previously proposed a connection structure of an external combustion type hot stove that can connect a heat storage chamber and a combustion chamber without using an expansion joint, as described in Patent Document 1 below. In this connection structure, when the dome of the heat storage chamber and the dome of the combustion chamber are connected by a connecting pipe, the ratio RD / TD between the pipe diameter RD of the connecting pipe and the dome diameter TD of the heat storage chamber is 0.24 or more and 0.60 or less. By making the ratio RD / TD of the pipe diameter RD of the connecting pipe and the dome diameter ND of the combustion chamber to be 0.44 or more and 0.60 or less, the drift of the gas in the furnace is prevented and the local knuckle portion of the connecting pipe is locally Therefore, it was possible to connect the heat storage chamber and the combustion chamber without expansion joints.
特開平７−１１３１６号公報JP 7-11316 A
　しかしながら、熱風炉では、燃焼室（蓄熱室一体のものを含む）と熱風本管との連結部、所謂熱風支管もあり、この熱風支管も、熱変位の差や熱変位そのものを吸収するために伸縮継手を用いており、伸縮継手の使用箇所には、所謂反力をとるためのテンションビームを用いていることから、前述と同様に、構造が複雑になったり、鉄皮が赤熱したり、伸縮継手そのものが破損したりするという問題がある。
　本発明は、上記のような問題点に着目してなされたものであり、伸縮継手を不要とし、伸縮継手に係る諸問題を回避することが可能な高炉の熱風炉の熱風支管構築方法を提供することを目的とするものである。 However, in a hot air furnace, there is also a connecting portion between a combustion chamber (including a heat storage chamber integrated) and a hot air main pipe, a so-called hot air branch pipe, and this hot air branch pipe also absorbs the difference in thermal displacement and the thermal displacement itself. Since the expansion joint is used and the tension beam used to take the so-called reaction force is used at the location where the expansion joint is used, the structure becomes complicated, the iron skin becomes red hot, There is a problem that the expansion joint itself is damaged.
The present invention has been made paying attention to the above problems, and provides a hot air branch pipe construction method for a hot blast furnace of a blast furnace that can eliminate the need for an expansion joint and avoid various problems related to the expansion joint. It is intended to do.
　上記課題を解決するために、本発明の高炉の熱風炉の熱風支管構築方法は、高炉の環状管に接続される熱風本管と熱風炉本体との間に介装される熱風支管垂直部と熱風支管水平部を有する熱風支管を構築する高炉の熱風炉の熱風支管構築方法において、熱風炉本体と熱風支管垂直部との熱風炉乾燥昇温時の熱膨張差δに対し、熱風支管垂直部の熱風炉本体への連結箇所の高さを、熱風炉本体の熱風支管垂直部への連結箇所の高さより、熱膨張差吸収代σ＝０．２δ~δ分、高くして熱風支管垂直部を初期据付することを特徴とするものである。 In order to solve the above problems, a hot air branch construction method for a hot blast furnace of the blast furnace according to the present invention includes a hot air branch pipe vertical portion interposed between a hot air main pipe connected to an annular pipe of the blast furnace and the hot blast furnace body. In the method for constructing a hot blast furnace hot blast furnace for constructing a hot blast branch having a horizontal section of the hot blast branch, the vertical section of the hot blast branch with respect to the thermal expansion difference δ at the time of heating and drying of the hot blast furnace between the hot blast furnace main body and the vertical section of the hot blast The height of the connecting part to the hot air furnace main body is higher than the height of the connecting part to the hot air branch vertical part of the hot air furnace body by increasing the thermal expansion difference absorption margin σ = 0.2δ to δ minutes. The initial installation is performed.
　また、前記熱風支管垂直部を高さ調整可能な支承で支持し、前記熱風支管垂直部の初期据付後、前記熱風支管垂直部を下降することで当該熱風支管垂直部と熱風炉本体との連結箇所を同じ高さにして当該熱風支管垂直部と熱風炉本体とを熱風支管上部水平部で連結した後、熱風炉乾燥昇温中の熱風炉本体及び熱風支管垂直部の熱膨張に応じて前記熱風支管垂直部の高さを調整することを特徴とするものである。 Further, the hot air branch pipe vertical part is supported by a height-adjustable support, and after the initial installation of the hot air branch pipe vertical part, the hot air branch pipe vertical part is lowered to connect the hot air branch pipe vertical part and the hot air furnace main body. After connecting the vertical part of the hot air branch pipe and the main body of the hot air furnace with the horizontal part of the upper part of the hot air branch pipe with the same height, the hot air furnace body and the vertical part of the hot air branch pipe during the temperature rise of the hot air furnace are heated according to the thermal expansion. The height of the vertical portion of the hot air branch pipe is adjusted.
　また、熱風炉乾燥昇温後、前記熱風支管垂直部の高さを調整して前記熱膨張差δと熱膨張差吸収代σとの実熱膨張差δ−σを熱風支管上部水平部と熱風支管下部水平部とで等分又はほぼ等分にすることを特徴とするものである。
　また、前記熱風支管垂直部と熱風炉本体とを熱風支管上部水平部で連結した後、前記熱風支管垂直部を上昇して熱風支管下部水平部を水平にした状態で当該熱風支管下部水平部内にレンガを積み、次いで前記熱風支管垂直部を下降して前記熱風支管上部水平部を水平にした状態で当該熱風支管上部水平部内にレンガを積むことを特徴とするものである。 In addition, after the temperature rise in the hot air oven, the height of the vertical portion of the hot air branch pipe is adjusted, and the actual thermal expansion difference δ−σ between the thermal expansion difference δ and the thermal expansion difference absorption margin σ is changed to the hot air branch upper horizontal portion and the hot air. It is characterized in that it is divided equally or almost equally with the horizontal part of the lower part of the branch pipe.
In addition, after the hot air branch pipe vertical part and the hot air furnace main body are connected by the hot air branch pipe upper horizontal part, the hot air branch pipe vertical part is raised and the hot air branch pipe lower horizontal part is leveled in the hot air branch lower part horizontal part. Brick is stacked, and then the hot air branch pipe upper horizontal portion is lowered and the hot air branch pipe upper horizontal portion is leveled, and bricks are stacked in the hot air branch upper horizontal portion.
　上記課題を解決するために、本発明の高炉の熱風炉の熱風支管は、高炉の環状管に接続される熱風本管と熱風炉本体との間に介装される熱風支管垂直部と熱風支管水平部を有する熱風支管において、熱風支管の垂直部及び水平部の長さを、夫々の管径の３倍以上としたことを特徴とするものである。
　なお、垂直部及び水平部の長さは、夫々の管の中心線間長さである。 In order to solve the above problems, a hot air branch pipe of a hot blast furnace of the blast furnace according to the present invention includes a hot air branch vertical section and a hot air branch pipe interposed between a hot air main pipe connected to an annular pipe of the blast furnace and the hot blast furnace main body. In the hot air branch pipe having a horizontal portion, the length of the vertical portion and the horizontal portion of the hot air branch pipe is set to be three times or more of the respective pipe diameters.
In addition, the length of a vertical part and a horizontal part is the length between centerlines of each pipe | tube.
　而して、本発明の高炉の熱風炉の熱風支管構築方法によれば、熱風炉本体と熱風支管垂直部との熱風炉乾燥昇温時の熱膨張差δに対し、熱風支管垂直部の熱風炉本体への連結箇所の高さを、熱風炉本体の熱風支管垂直部への連結箇所の高さより、熱膨張差吸収代σ＝０．２δ~δ分、高くして熱風支管垂直部を初期据付することとしたため、熱風炉の乾燥昇温後には熱風支管垂直部と熱風炉本体との連結箇所に生じる実熱膨張差はδ−σとなり、熱変位の差や熱変位自体を吸収することによって、両者の連結部位に伸縮継手が不要となり、伸縮継手に係る諸問題を回避することが可能となる。 Thus, according to the method for constructing a hot blast furnace hot air branch of the blast furnace according to the present invention, the hot air in the vertical part of the hot air branch is against the thermal expansion difference δ at the time of drying in the hot air furnace between the hot blast furnace body and the vertical part of the hot air branch. The height of the connecting part to the furnace body is set higher than the height of the connecting part to the hot air branch vertical part of the hot air furnace main body by a thermal expansion difference absorption margin σ = 0.2δ ~ δ, and the hot air branch vertical part is initially set Because it was decided to install it, the actual thermal expansion difference that occurs at the connection point between the vertical section of the hot air branch tube and the main body of the hot air furnace after the heating and drying of the hot air furnace becomes δ-σ, which absorbs the difference in thermal displacement and the thermal displacement itself. Thus, an expansion joint is not required at the connecting portion between the two, and problems associated with the expansion joint can be avoided.
　また、熱風支管垂直部を高さ調整可能な支承で支持し、熱風支管垂直部の初期据付後、熱風支管垂直部を下降することで当該熱風支管垂直部と熱風炉本体との連結箇所を同じ高さにして当該熱風支管垂直部と熱風炉本体とを熱風支管上部水平部で連結した後、熱風炉乾燥昇温中の熱風炉本体及び熱風支管垂直部の熱膨張に応じて熱風支管垂直部の高さを調整することにより、熱風炉乾燥昇温中に発生する熱膨張差を、例えば熱風支管の上部水平部及び下部水平部で分担することができ、これにより熱変位の差や熱変位自体を吸収することができる。 Also, the vertical part of the hot air branch pipe is supported by a height-adjustable support, and after the initial installation of the vertical part of the hot air branch pipe, the vertical part of the hot air branch pipe is lowered so that the connecting portion between the vertical part of the hot air branch pipe and the main body of the hot air furnace is the same. After connecting the vertical part of the hot air branch pipe and the main body of the hot air branch at the upper horizontal part of the hot air branch pipe at a height, the vertical part of the hot air branch pipe according to the thermal expansion of the hot air furnace body and the vertical part of the hot air branch pipe during the temperature rise of the hot air furnace By adjusting the height of the hot air oven, the difference in thermal expansion that occurs during the hot air oven drying temperature rise can be shared, for example, by the upper horizontal part and the lower horizontal part of the hot air branch pipe, thereby enabling the difference in thermal displacement and the thermal displacement. It can absorb itself.
　また、熱風炉乾燥昇温後、熱風支管垂直部の高さを調整して熱膨張差δと熱膨張差吸収代σとの実熱膨張差δ−σを熱風支管上部水平部と熱風支管下部水平部とで等分又はほぼ等分にすることにより、熱変位の差や熱変位自体を可及的に吸収することができる。
　また、熱風支管垂直部と熱風炉本体とを熱風支管上部水平部で連結した後、熱風支管垂直部を上昇して熱風支管下部水平部を水平にした状態で当該熱風支管下部水平部内にレンガを積み、次いで熱風支管垂直部を下降して熱風支管上部水平部を水平にした状態で当該熱風支管上部水平部内にレンガを積むことにより、熱風支管上部水平部内及び下部水平部内のレンガ積みが容易になり、レンガの摩耗や脱落、鉄皮の赤熱などの諸問題を抑制防止することができる。 After the temperature rise in the hot air oven, the height of the vertical section of the hot air branch pipe is adjusted to obtain the actual thermal expansion difference δ-σ between the thermal expansion difference δ and the thermal expansion difference absorption margin σ. By making the horizontal portion equally or almost equally divided, the difference in thermal displacement and the thermal displacement itself can be absorbed as much as possible.
In addition, after connecting the vertical section of the hot air branch and the main body of the hot air furnace at the upper horizontal section of the hot air branch pipe, the vertical section of the hot air branch pipe is raised and the horizontal portion of the lower portion of the hot air branch pipe is leveled, and the brick is placed in the lower horizontal section of the hot air branch Stacking bricks in the upper horizontal part of the hot air branch pipe and the horizontal part of the lower part of the hot air branch pipe is easy by lowering the vertical part of the hot air branch pipe and then placing the brick in the upper horizontal part of the hot air branch pipe in the state where the upper horizontal part of the hot air branch pipe is leveled. Thus, it is possible to suppress and prevent various problems such as brick wear and dropping and red heat of the iron skin.
　而して、本発明の高炉の熱風炉の熱風支管構造によれば、熱風支管の垂直部及び水平部の長さを、夫々の管径の３倍以上とすることにより、熱変位の差や熱変位そのものが生じても、管自体の弾性変形で吸収することができ、その結果、伸縮継手を使用する必要がなくなり、伸縮継手に係る諸問題を回避することができる。 Thus, according to the hot air branch pipe structure of the blast furnace of the present invention, the length of the vertical part and the horizontal part of the hot air branch pipe is set to be three times or more of the respective pipe diameters, Even if thermal displacement itself occurs, it can be absorbed by elastic deformation of the tube itself. As a result, it is not necessary to use an expansion joint, and various problems associated with the expansion joint can be avoided.
本発明の高炉の熱風炉の熱風支管構築方法の一実施形態を示す第１工程図である。It is a 1st process drawing which shows one Embodiment of the hot-air branch pipe construction method of the hot-blast furnace of the blast furnace of this invention. 図１の熱風支管構築方法の第２工程図である。It is a 2nd process drawing of the hot air branch pipe construction method of FIG. 図１の熱風支管構築方法の第３工程図である。It is a 3rd process drawing of the hot air branch pipe construction method of FIG. 図１の熱風支管構築方法の第４工程図である。It is a 4th process drawing of the hot air branch pipe construction method of FIG. 図１の熱風支管構築方法の第５工程図である。It is a 5th process drawing of the hot air branch pipe construction method of FIG. 図１の熱風支管構築方法の第６工程図である。It is a 6th process figure of the hot-air branch pipe construction method of FIG. 本発明の高炉の熱風炉の熱風支管構造の一実施形態を示す全体図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a general view which shows one Embodiment of the hot-air branch pipe structure of the hot-blast furnace of the blast furnace of this invention. 本発明の高炉の熱風炉の熱風支管構造の種々の実施形態を示す全体図である。It is a general view which shows various embodiment of the hot air branch pipe structure of the hot blast furnace of the blast furnace of this invention. 従来の高炉の熱風炉の熱風支管構造の一例を示す全体図である。It is a general view which shows an example of the hot air branch pipe structure of the hot blast furnace of the conventional blast furnace.
［実施の形態１］ [Embodiment 1]
　次に、本発明の高炉の熱風炉の熱風支管構築方法の一実施形態について図面を参照しながら説明する。
　図１~図６は、本実施形態の熱風炉の熱風支管構築方法の全工程図である。本実施形態の熱風炉は、所謂燃焼室と蓄熱室とが一体になった頂燃式熱風炉である。図中の符号１は熱風炉本体である。また、図中の符号２は、高炉の環状管に接続される熱風本管である。熱風支管３とは、前記熱風炉本体１から熱風本管２までの連結管構造をいう。なお、熱風炉本体１、熱風支管３、熱風本管２とも、外殻は所謂鉄皮で覆われているが、内部には鉄皮を保護するためのレンガを積む必要がある。レンガは、熱膨張や熱収縮を吸収できるような特別な積み方で積む必要である。また、本発明の熱風支管構築方法は、従来の外燃式熱風炉にも適用可能であり、その場合には熱風炉の燃焼室と熱風本管との間に配設される熱風支管が対象となり、後述する熱膨張差は燃焼室が対象となる。 Next, an embodiment of a method for constructing a hot air branch pipe of a hot blast furnace according to the present invention will be described with reference to the drawings.
1 to 6 are all process diagrams of the hot air branch construction method for a hot stove according to the present embodiment. The hot stove of this embodiment is a top-fired hot stove in which a so-called combustion chamber and a heat storage chamber are integrated. Reference numeral 1 in the figure denotes a hot stove body. Moreover, the code | symbol 2 in a figure is a hot-air main pipe connected to the annular pipe of a blast furnace. The hot air branch pipe 3 refers to a connecting pipe structure from the hot air furnace main body 1 to the hot air main pipe 2. In addition, although the outer shell of the hot-blast furnace main body 1, the hot-air branch pipe 3, and the hot-air main pipe 2 is covered with a so-called iron skin, it is necessary to load a brick for protecting the iron skin inside. Brick needs to be stacked in a special way that can absorb thermal expansion and contraction. The hot air branch pipe construction method of the present invention can also be applied to a conventional external combustion type hot air furnace, in which case the hot air branch pipe disposed between the combustion chamber of the hot air furnace and the hot air main pipe is an object. Thus, the difference in thermal expansion described later is for the combustion chamber.
　図１は、熱風支管３のうち、熱風支管下部水平部４、熱風支管垂直部５の初期据付状態を示す第１工程図である。熱風支管下部水平部４は、サポート７に支持されて熱風本管２に連結されている。熱風支管垂直部５は、架台８上のジャッキ（支承）９に支持されて、下端部が熱風支管下部水平部４に連結されている。ジャッキ９は、熱風支管垂直部５の高さを調整するためのものである。このとき、熱風支管下部水平部４は水平である。そして、熱風炉本体１の熱風支管垂直部５への連結箇所の高さに対し、熱風支管垂直部５の熱風炉本体１への連結箇所の高さが、熱膨張差吸収代σ分だけ高くなるように初期据付する。この熱膨張差吸収代σは、熱風炉本体１と熱風支管垂直部５の熱膨張差δの０．２~１．０倍に設定されている。 FIG. 1 is a first process diagram showing an initial installation state of a hot air branch pipe lower horizontal part 4 and a hot air branch pipe vertical part 5 of the hot air branch pipe 3. The hot air branch lower horizontal part 4 is supported by a support 7 and connected to the hot air main pipe 2. The hot air branch vertical part 5 is supported by a jack (support) 9 on the gantry 8, and the lower end part is connected to the hot air branch lower horizontal part 4. The jack 9 is for adjusting the height of the hot air branch pipe vertical part 5. At this time, the hot air branch pipe lower horizontal part 4 is horizontal. And the height of the connection location of the hot air branch pipe vertical portion 5 to the hot air furnace main body 1 is higher than the height of the connection portion of the hot air furnace main body 1 to the hot air branch vertical portion 5 by the thermal expansion difference absorption margin σ. Initial installation to be This thermal expansion difference absorption margin σ is set to 0.2 to 1.0 times the thermal expansion difference δ between the hot stove main body 1 and the hot air branch pipe vertical portion 5.
　熱風炉本体１も熱風支管垂直部５も、構築時には勿論常温であるが、後述する乾燥昇温時には、内部のレンガの作用によって、約１００℃まで昇温する（熱風の温度は更に高い）。図から明らかなように、熱風炉本体１の方が、熱風支管垂直部５に対し、高さ方向の長さが長い（高さが高い）。そのため、乾燥昇温時の高さ方向への熱膨張量は、熱風炉本体１の方が熱風支管垂直部５のそれより大きい。この熱膨張量の高さ方向への差を熱膨張差δとする。従って、熱風炉本体１の熱風支管垂直部５への連結箇所の高さに対し、熱風支管垂直部５の熱風炉本体１への連結箇所の高さを、熱膨張差吸収代σ分だけ高く初期据付し、両者を連結した後、乾燥昇温すれば、熱膨張差δは実熱膨張差δ−σになる。 Both the hot blast furnace main body 1 and the hot air branch vertical section 5 are of ordinary temperature at the time of construction, but the temperature rises to about 100 ° C. (the hot air temperature is higher) due to the action of the internal bricks at the time of drying and heating described later. As is clear from the figure, the hot stove main body 1 is longer in the height direction (higher in height) than the hot air branch vertical portion 5. Therefore, the amount of thermal expansion in the height direction when the temperature of the drying is increased is larger in the hot stove body 1 than that in the hot air branch vertical portion 5. The difference in the amount of thermal expansion in the height direction is defined as a thermal expansion difference δ. Accordingly, the height of the connecting portion of the hot air branch pipe vertical portion 5 to the hot air furnace main body 1 is higher than the height of the connecting portion of the hot air furnace main body 1 to the hot air branch vertical portion 5 by the thermal expansion difference absorption margin σ. After the initial installation and connecting the two, if the temperature of drying is increased, the thermal expansion difference δ becomes the actual thermal expansion difference δ−σ.
　図１の状態で、熱風炉本体１と熱風支管垂直部５を熱風支管上部水平部６で接続しても、乾燥昇温後の熱風支管垂直部５と熱風炉本体１との熱膨張差δは実熱膨張差δ−σになる。しかしながら、それでは、構築時、熱風支管上部水平部６は熱風炉本体１側が下がった状態で連結され、そこから、乾燥昇温時に、熱風炉本体１側が上昇してゆく（図６参照）ので、熱風支管上部水平部６の内部応力が大きくなってしまう。そこで、本実施形態では、図２に示すように、ジャッキ９で熱風支管垂直部５を前記熱膨張差吸収代σ分だけ下げ、熱風支管垂直部５と熱風炉本体１との連結箇所を同じ高さにしてから、両者を熱風支管上部水平部６により水平状態で連結する。例えば、この状態からであれば、例えば図６の状態まで熱風支管上部水平部６の熱風炉本体１側が上昇しても内部応力はさほど大きくならない。 In the state of FIG. 1, even if the hot blast furnace main body 1 and the hot blast branch vertical portion 5 are connected by the hot blast branch upper horizontal portion 6, the difference in thermal expansion δ between the hot blast branch vertical portion 5 and the hot blast furnace main body 1 after the temperature rise of drying. Is the actual thermal expansion difference δ−σ. However, at the time of construction, the hot air branch upper horizontal portion 6 is connected in a state where the hot stove body 1 side is lowered, and from there, the hot stove body 1 side rises when the temperature of the drying is raised (see FIG. 6). The internal stress of the hot air branch pipe upper horizontal portion 6 is increased. Therefore, in the present embodiment, as shown in FIG. 2, the hot air branch pipe vertical portion 5 is lowered by the thermal expansion difference absorption margin σ with a jack 9, and the connecting portion between the hot air branch pipe vertical portion 5 and the hot stove main body 1 is the same. After the height, both are connected in a horizontal state by the hot air branch upper horizontal portion 6. For example, if it is from this state, even if the hot-blast furnace main body 1 side of the hot-air branch pipe upper horizontal part 6 raises to the state of FIG. 6, for example, an internal stress will not become so large.
　図２の状態は、熱風炉として未完成である。なぜなら、例えば熱風支管下部水平部４や熱風支管上部水平部６内にレンガが積まれていないからである。一般的には、強度面や作業性から、先に熱風支管下部水平部４内にレンガを積み、後から熱風支管上部水平部５内にレンガを積む。そこで、本実施形態では、図３に示すように、ジャッキ９で熱風支管垂直部５を前記熱膨張差吸収代σ分だけ再び上げ、熱風支管下部水平部４を水平状態とし、その状態で当該熱風支管下部水平部４内にレンガを積む。この熱風支管下部水平部４内のレンガ積みが終了したら、図４に示すように、ジャッキ９で熱風支管垂直部５を前記熱膨張差吸収代σ分だけ再び下げ、熱風支管上部水平部６を水平状態とし、その状態で当該熱風支管上部水平部６内にレンガを積む。 2 The state of FIG. 2 is incomplete as a hot stove. This is because, for example, bricks are not stacked in the hot air branch lower horizontal part 4 or the hot air branch upper horizontal part 6. In general, from the viewpoint of strength and workability, bricks are first stacked in the hot air branch lower horizontal portion 4, and bricks are subsequently stacked in the hot air branch upper horizontal portion 5. Therefore, in the present embodiment, as shown in FIG. 3, the hot air branch pipe vertical portion 5 is raised again by the thermal expansion difference absorption margin σ by the jack 9, and the hot air branch pipe lower horizontal portion 4 is brought into a horizontal state, and in this state, A brick is piled in the horizontal part 4 at the lower part of the hot air branch pipe. When the brick stacking in the hot air branch lower horizontal portion 4 is completed, as shown in FIG. 4, the hot air branch vertical portion 5 is lowered again by the thermal expansion difference absorption margin σ with a jack 9, and the hot air branch upper horizontal portion 6 is lowered. It is set as a horizontal state, and the brick is piled in the said hot air branch pipe upper horizontal part 6 in the state.
　この状態で、熱風炉そのものの構築は完了する。このとき、熱風支管上部水平部６は前記図２の状態と同じく水平状態であり、内部応力はゼロ又はほぼゼロである。従って、この状態から、熱風炉の乾燥昇温に移行する。前述したように、熱風炉本体１も熱風支管垂直部５も熱膨張によって高さ方向に長くなる。このとき、図５に示すように、熱風炉本体１は下端部が接地しているので上方に長くなるだけであるが、熱風支管垂直部５は上方だけでなく、ジャッキ９の支持部を支点として下方にも長くなる。この熱膨張、或いは熱変形の状態に合わせて、ジャッキ９により熱風支管垂直部５の高さを調整して、熱風支管下部水平部４及び熱風支管上部水平部６の内部応力が大きくなりすぎないようにする。 In this state, the construction of the hot stove itself is completed. At this time, the hot air branch upper horizontal portion 6 is in a horizontal state as in the state of FIG. 2, and the internal stress is zero or almost zero. Therefore, it shifts from this state to the drying temperature rise of the hot stove. As described above, both the hot stove main body 1 and the hot air branch pipe vertical portion 5 become longer in the height direction due to thermal expansion. At this time, as shown in FIG. 5, the hot stove main body 1 is not only long because the lower end portion is grounded, but the hot air branch vertical portion 5 is not only the upper portion but also supports the support portion of the jack 9. As it becomes longer downward. In accordance with the state of thermal expansion or thermal deformation, the jack 9 adjusts the height of the hot air branch vertical portion 5 so that the internal stress of the hot air branch lower horizontal portion 4 and the hot air branch upper horizontal portion 6 does not become too large. Like that.
　乾燥昇温後は、ジャッキ９によって熱風支管垂直部５の高さを調整して、図６に示すように、熱風支管下部水平部４の熱風本管２側と熱風支管垂直部５側の高さの差が前記実熱膨張差の半分（δ−σ）／２、熱風支管上部水平部６の熱風炉本体１側と熱風支管垂直部５側の高さの差が前記実熱膨張差の半分（δ−σ）／２となるようにする、即ち実熱膨張差δ−σを熱風支管上部水平部６と熱風支管下部水平部４とで等分又はほぼ等分にすることで、熱変位の差或いは熱変位そのものを可及的に吸収することができ、熱風支管上部水平部６の内部応力と、熱風支管下部水平部４の内部応力とを同時に最小とすることができる。 After the temperature rise of the drying, the height of the hot air branch vertical portion 5 is adjusted by the jack 9, and the hot air main pipe 2 side and the hot air branch vertical portion 5 side of the hot air branch lower horizontal portion 4 as shown in FIG. The difference in height is half the actual thermal expansion difference (δ−σ) / 2, and the difference in height between the hot air furnace main body 1 side and the hot air branch vertical part 5 side of the hot air branch upper horizontal part 6 is the actual thermal expansion difference. Half (δ−σ) / 2, that is, by making the actual thermal expansion difference δ−σ equal or almost equally divided between the hot air branch upper horizontal portion 6 and the hot air branch lower horizontal portion 4 The difference in displacement or the thermal displacement itself can be absorbed as much as possible, and the internal stress of the hot air branch upper horizontal portion 6 and the internal stress of the hot air branch lower horizontal portion 4 can be minimized simultaneously.
　本発明者は、前述の熱風支管構築方法に加えて、熱風支管を構成する垂直部及び水平部の長さを、それらの管径の３倍以上とし、乾燥昇温時に発生する熱変位の差や熱変位自体を管の弾性変形で吸収することにより、伸縮継手を用いない熱風支管構造を開発している。熱風支管垂直５の長さは、熱風支管垂直部５の管径の３倍以上、６倍以下であるのが望ましい。５倍以上、５．５倍以下であるのがより望ましい。熱風支管水平部４，６の長さは熱風支管水平部４，６の管径の３倍以上であればよく、熱風炉本体と熱風炉本管の位置によって長くすることができる。熱風支管を構成する垂直部及び水平部の長さを、それらの管径の３倍以上とした場合、５０００ｍ３の高炉の熱風炉で内圧と熱膨張を加えたときの有限要素法による解析結果で、例えば熱風支管上部水平部６と熱風支管垂直部５との連結部に発生する最も大きな応力を２１０Ｎ／ｍｍ２と疲労耐久応力の許容内に抑制することができるようになった。しかしながら、本実施形態の熱風支管構築方法を併用すれば、熱風支管上部水平部６と熱風支管垂直部５との連結部に発生する応力を１４０Ｎ／ｍｍ２まで小さくすることができ、伸縮継手を用いることなく、熱風支管３に発生する内部応力を大幅に低減することができる。 In addition to the hot air branch pipe construction method described above, the inventor sets the length of the vertical part and the horizontal part constituting the hot air branch pipe to be three times or more of the diameters of the hot air branch pipes, and the difference in thermal displacement that occurs when the temperature of the drying is increased. We are developing a hot air branch pipe structure that does not use expansion joints by absorbing the heat displacement itself by elastic deformation of the pipe. It is desirable that the length of the hot air branch pipe vertical 5 is not less than 3 times and not more than 6 times the tube diameter of the hot air branch pipe vertical portion 5. It is more desirable to be 5 times or more and 5.5 times or less. The length of the hot air branch horizontal portions 4 and 6 may be three or more times the tube diameter of the hot air branch horizontal portions 4 and 6, and can be made longer depending on the position of the hot air furnace main body and the hot air furnace main. The length of the vertical portion and a horizontal portion which constitutes the hot air branch pipe, when less than three times of their pipe diameter, the analysis results by the finite element method when adding pressure and thermal expansion in a hot air furnace blast of 5000 m 3 Thus, for example, the largest stress generated in the connecting portion between the hot air branch upper horizontal portion 6 and the hot air branch vertical portion 5 can be suppressed to 210 N / mm 2 and within the allowable fatigue endurance stress. However, if the hot air branch pipe construction method of this embodiment is used in combination, the stress generated at the connecting portion between the hot air branch upper horizontal part 6 and the hot air branch vertical part 5 can be reduced to 140 N / mm 2 , Without using it, the internal stress generated in the hot air branch pipe 3 can be greatly reduced.
　このように、本実施形態の高炉の熱風炉の熱風支管構築方法では、熱風炉本体１と熱風支管垂直部５との熱風炉乾燥昇温時の熱膨張差δに対し、熱風支管垂直部５の熱風炉本体１への連結箇所の高さを、熱風炉本体１の熱風支管垂直部５への連結箇所の高さより、熱膨張差吸収代σ＝０．２δ~δ分、高くして熱風支管垂直部５を初期据付することにより、熱風炉の乾燥昇温後には熱風支管垂直部５と熱風炉本体１との連結箇所に生じる実熱膨張差はδ−σとなり、熱変位の差や熱変位自体を吸収することによって、両者の連結部位に伸縮継手が不要となり、伸縮継手に係る諸問題を回避することが可能となる。 As described above, in the hot air branch pipe construction method for a blast furnace of the present embodiment, the hot air branch vertical part 5 with respect to the difference in thermal expansion δ between the hot air furnace main body 1 and the hot air branch vertical part 5 at the time of hot air furnace drying temperature rise. The height of the connecting part to the hot stove body 1 is higher than the height of the connecting part to the hot air branch vertical part 5 of the hot stove body 1 by a thermal expansion difference absorption margin σ = 0.2δ to δ, and the hot air By initially installing the branch pipe vertical portion 5, the actual thermal expansion difference occurring at the connecting portion between the hot air branch pipe vertical portion 5 and the hot stove main body 1 after the heating and heating of the hot stove becomes δ−σ, By absorbing the thermal displacement itself, an expansion joint is not required at the connecting portion between the two, and problems associated with the expansion joint can be avoided.
　また、熱風支管垂直部５をジャッキ９で支持し、熱風支管垂直部５の初期据付後、熱風支管垂直部５を下降することで当該熱風支管垂直部５と熱風炉本体１との連結箇所を同じ高さにして当該熱風支管垂直部５と熱風炉本体１とを熱風支管上部水平部６で連結した後、熱風炉乾燥昇温中の熱風炉本体１及び熱風支管垂直部５の熱膨張に応じて熱風支管垂直部５の高さを調整することにより、熱風炉乾燥昇温中に発生する熱膨張差を、熱風支管上部水平部６及び下部水平部４で分担することができ、これにより熱変位の差や熱変位自体を吸収することができる。 Further, the hot air branch pipe vertical portion 5 is supported by a jack 9, and after the initial installation of the hot air branch pipe vertical portion 5, the hot air branch pipe vertical portion 5 is moved down so that the hot air branch pipe vertical portion 5 and the hot air furnace main body 1 are connected. After the hot air branch pipe vertical part 5 and the hot air furnace main body 1 are connected to each other by the hot air branch pipe upper horizontal part 6 at the same height, the hot air furnace body 1 and the hot air branch pipe vertical part 5 undergo thermal expansion during the hot air furnace drying temperature rise. Accordingly, by adjusting the height of the hot air branch vertical part 5, the difference in thermal expansion that occurs during the hot air oven drying temperature rise can be shared by the hot air branch upper horizontal part 6 and the lower horizontal part 4. The difference in thermal displacement and the thermal displacement itself can be absorbed.
　また、熱風炉乾燥昇温後、熱風支管垂直部５の高さを調整して熱膨張差δと熱膨張差吸収代σとの実熱膨張差δ−σを熱風支管上部水平部６と熱風支管下部水平部４とで等分又はほぼ等分にすることにより、熱変位の差や熱変位自体を可及的に吸収することができる。
　また、熱風支管垂直部５と熱風炉本体１とを熱風支管上部水平部６で連結した後、熱風支管垂直部５を上昇して熱風支管下部水平部４を水平にした状態で当該熱風支管下部水平部４内にレンガを積み、次いで熱風支管垂直部５を下降して熱風支管上部水平部６を水平にした状態で当該熱風支管上部水平部６内にレンガを積むことにより、熱風支管上部水平部６内及び下部水平部４内のレンガ積みが容易になり、レンガの摩耗や脱落、鉄皮の赤熱などの諸問題を抑制防止することができる。
［符号の説明］ Further, after the temperature rise in the hot air oven, the height of the hot air branch pipe vertical portion 5 is adjusted so that the actual thermal difference δ−σ between the thermal expansion difference δ and the thermal expansion difference absorption margin σ is changed to the hot air branch upper horizontal portion 6 and the hot air. By dividing equally or almost equally with the lower horizontal portion 4 of the branch pipe, the difference in thermal displacement and the thermal displacement itself can be absorbed as much as possible.
Moreover, after connecting the hot air branch vertical part 5 and the hot air furnace main body 1 with the hot air branch pipe upper horizontal part 6, the hot air branch pipe vertical part 5 is raised and the hot air branch lower part horizontal part 4 is leveled. By stacking bricks in the horizontal portion 4 and then lowering the vertical portion 5 of the hot air branch and leveling the upper horizontal portion 6 of the hot air branch tube, the bricks are stacked in the upper horizontal portion 6 of the hot air branch tube, Brick stacking in the portion 6 and the lower horizontal portion 4 is facilitated, and various problems such as brick wear and dropping and red heat of the iron skin can be suppressed and prevented.
[Explanation of symbols]
　１は熱風炉本体、２は熱風本管、３は熱風支管、４は熱風支管下部水平部、５は熱風支管垂直部、６は熱風支管上部水平部、７はサポート、８は架台、９はジャッキ
　［実施の形態２］ 1 is a hot-blast furnace main body, 2 is a hot-air main pipe, 3 is a hot-air branch pipe, 4 is a hot-air branch pipe lower horizontal part, 5 is a hot-air branch pipe vertical part, 6 is a hot-air branch pipe upper horizontal part, 7 is a support, 8 is a mount, 9 is Jack [Embodiment 2]
　次に、本発明の高炉の熱風炉の熱風支管構造の一実施形態について図面を参照しながら説明する。
　図７は、本実施形態の熱風炉の熱風支管構造の全体図である。図中の符号１１は蓄熱室、符号１２は燃焼室である。また、図中の符号１８は、高炉の環状管に接続される熱風本管である。熱風支管１４とは、前記燃焼室１２から熱風本管１８までの連結管構造をいう。なお、本実施形態の熱風炉では、蓄熱室１１と燃焼室１２の連結部分に伸縮継手は用いられていない。また、蓄熱室１１、燃焼室１２、熱風支管１４、熱風本管１８とも、外殻は所謂鉄皮で覆われているが、内部には鉄皮を保護するためのレンガが積まれている。レンガは、熱膨張や熱収縮を吸収できるような特別な積み方がなされている。 Next, an embodiment of the hot air branch pipe structure of the blast furnace of the present invention will be described with reference to the drawings.
FIG. 7 is an overall view of the hot air branch pipe structure of the hot stove of the present embodiment. Reference numeral 11 in the figure denotes a heat storage chamber, and reference numeral 12 denotes a combustion chamber. Moreover, the code | symbol 18 in a figure is a hot-air main pipe connected to the annular pipe of a blast furnace. The hot air branch pipe 14 refers to a connecting pipe structure from the combustion chamber 12 to the hot air main pipe 18. In the hot stove of this embodiment, an expansion joint is not used at the connecting portion between the heat storage chamber 11 and the combustion chamber 12. Further, the outer shell of each of the heat storage chamber 11, the combustion chamber 12, the hot air branch pipe 14, and the hot air main pipe 18 is covered with a so-called iron skin, but a brick for protecting the iron skin is stacked inside. Brick is specially stacked to absorb thermal expansion and contraction.
　本実施形態の熱風支管１４は、燃焼室１２に連結された熱風支管第１水平部１５、熱風支管第１水平部１５に連結された熱風支管垂直部１６、熱風支管垂直部１６と熱風本管１８とを連結する熱風支管第２水平部１７とを備えて構成される。熱風支管１４の各部は、内部に積まれたレンガにより、建設当初の常温から、操業時の約１００℃程度までしか昇温しないが、熱変形に伴う熱変位の差、或いは熱変異そのものが生じる。そのため、従来は、図９に示すように、熱風支管第１水平部１５や熱風支管第２水平部１７に伸縮継手Ａを用いて、それらを吸収するようにしていた。また、伸縮継手Ａを用いている部位には、その反力をとるためのテンションビーム１３も併設されている。 The hot air branch pipe 14 of this embodiment includes a hot air branch first horizontal portion 15 connected to the combustion chamber 12, a hot air branch vertical portion 16 connected to the hot air branch first horizontal portion 15, a hot air branch vertical portion 16 and a hot air main pipe. And a hot-air branch pipe second horizontal portion 17 that connects to the first and second horizontal portions 17. Each part of the hot air branch pipe 14 is heated only from a normal temperature at the time of construction to about 100 ° C. at the time of operation by bricks stacked inside, but a difference in thermal displacement due to thermal deformation or a thermal mutation itself occurs. . Therefore, conventionally, as shown in FIG. 9, the expansion joint A is used for the hot air branch first horizontal portion 15 and the hot air branch second horizontal portion 17 to absorb them. Further, a tension beam 13 for taking the reaction force is also provided at the site where the expansion joint A is used.
　前述したように、伸縮継手Ａには、それを使用することによる種々の問題がある。そこで、本実施形態では、図７に示すように、熱風支管第１水平部１５の長さを当該熱風支管第１水平部１５の管径の３倍以上とし、且つ熱風支管垂直１６の長さを当該熱風支管垂直部１６の管径の３倍以上とし、且つ熱風支管第２水平部１７の長さを当該熱風支管第２水平部１７の管径の３倍以上とすることにより、伸縮継手を用いない構造とした。夫々の管径は管部の外径を示す。また、夫々の長さは、連結する管部との連結箇所における中心線の交点間距離を示す。
　熱風支管垂直１６の長さは、熱風支管垂直部１６の管径の３倍以上、６倍以下であるのが望ましい。５倍以上、５．５倍以下であるのがより望ましい。熱風支管第１水平部１５の長さは熱風支管第１水平部１５の管径の３倍以上であればよく、熱風炉本体と熱風炉本管の位置によって長くすることができる。同様に、熱風支管第２水平部１７の長さも熱風支管第２水平部１７の管径の３倍以上であればよく、熱風炉本体と熱風炉本管の位置によって長くするができる。 As described above, the expansion joint A has various problems due to its use. Therefore, in the present embodiment, as shown in FIG. 7, the length of the hot air branch first horizontal portion 15 is set to be not less than three times the diameter of the hot air branch first horizontal portion 15 and the length of the hot air branch vertical 16 is longer. Is set to at least three times the tube diameter of the hot air branch pipe vertical portion 16, and the length of the hot air branch pipe second horizontal portion 17 is set to be at least three times the tube diameter of the hot air branch pipe second horizontal portion 17. It was set as the structure which does not use. Each tube diameter indicates the outer diameter of the tube portion. Moreover, each length shows the distance between the intersections of the centerline in the connection location with the pipe part to connect.
The length of the hot air branch vertical 16 is preferably not less than 3 times and not more than 6 times the tube diameter of the hot air branch vertical part 16. It is more desirable to be 5 times or more and 5.5 times or less. The length of the hot air branch first horizontal portion 15 may be three times or more the tube diameter of the hot air branch first horizontal portion 15 and can be made longer depending on the positions of the hot air furnace main body and the hot air furnace main. Similarly, the length of the hot air branch second horizontal portion 17 may be three times or more the tube diameter of the hot air branch second horizontal portion 17 and can be made longer depending on the positions of the hot air furnace main body and the hot air furnace main.
　このような間の径と長さの管径を満足することにより、例えば熱風支管第１水平部１５の熱変位と熱風支管第２水平部１７の熱変位との差や熱風支管垂直部１６自体の熱変位そのものを当該熱風支管垂直部１６の弾性変形で吸収することができ、その結果、伸縮継手が不要となる。例えば、５０００ｍ３の高炉の熱風炉で内圧と熱膨張を加えたときの有限要素法による解析結果で、例えば熱風支管第１水平部１５と熱風支管垂直部１６との連結部に最も大きな応力の発生することが分かったが、その大きさは２１０Ｎ／ｍｍ２と疲労耐久応力の許容内であった。 By satisfying such a diameter and length of the tube diameter, for example, the difference between the thermal displacement of the hot air branch first horizontal portion 15 and the heat displacement of the hot air branch second horizontal portion 17 and the hot air branch vertical portion 16 itself. The heat displacement itself can be absorbed by the elastic deformation of the hot air branch pipe vertical portion 16, and as a result, the expansion joint is not required. For example, it is an analysis result by a finite element method when internal pressure and thermal expansion are applied in a hot blast furnace of a 5,000 m 3 blast furnace. For example, the largest stress is applied to the connecting portion between the hot air branch first horizontal portion 15 and the hot air branch vertical portion 16. Although it was found that this occurred, the magnitude was 210 N / mm 2 , which was within the tolerance of fatigue endurance stress.
　図７は、前記特許文献１に記載される技術を用いて、蓄熱室１１と燃焼室１２の連結部分にも伸縮継手を用いない、所謂ベストモードであるが、本発明の高炉の熱風炉の熱風支管構造では、必ずしも伸縮継手を用いないことを前提とするものではない。図８ａは、熱風支管第２水平部１７に伸縮継手Ａ及びテンションビーム１３を用いている。また、図８ｂは、熱風支管第１水平部１５に伸縮継手Ａ及びテンションビーム１３を用いている。また、図８ｃは、蓄熱室１１と燃焼室１２の連結部分に伸縮継手Ａ及びテンションビーム１３を用いている。また、図８ｄは、蓄熱室１１と燃焼室１２の連結部分及び熱風支管第１水平部１５に伸縮継手Ａ及びテンションビーム１３を用いている。また、図８ｅは、蓄熱室１１と燃焼室１２の連結部分及び熱風支管第２水平部１７に伸縮継手Ａ及びテンションビーム１３を用いている。 FIG. 7 shows a so-called best mode in which the expansion joint is not used in the connecting portion between the heat storage chamber 11 and the combustion chamber 12 using the technique described in Patent Document 1, but the hot blast furnace of the blast furnace according to the present invention. In the hot air branch pipe structure, it is not necessarily assumed that the expansion joint is not used. In FIG. 8 a, the expansion joint A and the tension beam 13 are used for the hot air branch second horizontal portion 17. In FIG. 8 b, the expansion joint A and the tension beam 13 are used in the hot air branch first horizontal portion 15. Further, in FIG. 8 c, the expansion joint A and the tension beam 13 are used at the connecting portion between the heat storage chamber 11 and the combustion chamber 12. Further, in FIG. 8 d, the expansion joint A and the tension beam 13 are used for the connecting portion of the heat storage chamber 11 and the combustion chamber 12 and the hot air branch first horizontal portion 15. Further, in FIG. 8 e, the expansion joint A and the tension beam 13 are used for the connecting portion of the heat storage chamber 11 and the combustion chamber 12 and the hot air branch second horizontal portion 17.
　但し、何れの実施形態も、熱風支管第１水平部１５の長さを当該熱風支管第１水平部１５の管径の３倍以上とし、且つ熱風支管垂直１６の長さを当該熱風支管垂直部６の管径の３倍以上とし、且つ熱風支管第２水平部１７の長さを当該熱風支管第２水平部１７の管径の３倍以上としている。そのため、熱風支管１４を構成する各管部では、熱変位の差や熱変位自体を、自身の弾性変形で吸収することができるため、仮に伸縮継手を用いても、伸縮継手の負荷が小さく、また変形（変位）も小さいため、前記従来のような大きな問題となることがない。
　このように、本実施形態の高炉の熱風炉の熱風支管構造では、熱風支管１４の垂直部１６及び水平部１５，１７の長さを、夫々の管径の３倍以上とすることにより、熱変位の差や熱変位そのものが生じても、管自体の弾性変形で吸収することができ、その結果、伸縮継手を使用する必要がなくなり、伸縮継手に係る諸問題を回避することができる。
［符号の説明］ However, in any of the embodiments, the length of the hot air branch first horizontal portion 15 is three times or more the diameter of the hot air branch first horizontal portion 15 and the length of the hot air branch vertical 16 is the hot air branch vertical portion. 6 and the length of the hot air branch second horizontal portion 17 is three times or more the tube diameter of the hot air branch second horizontal portion 17. Therefore, in each pipe part constituting the hot air branch pipe 14, since the difference in thermal displacement and the thermal displacement itself can be absorbed by its own elastic deformation, even if an expansion joint is used, the load on the expansion joint is small. Further, since deformation (displacement) is small, it does not become a big problem as in the conventional case.
As described above, in the hot air branch structure of the hot blast furnace of the blast furnace of the present embodiment, the length of the vertical portion 16 and the horizontal portions 15 and 17 of the hot air branch tube 14 is set to be three times or more of the respective tube diameters. Even if a difference in displacement or a thermal displacement itself occurs, it can be absorbed by elastic deformation of the tube itself. As a result, it is not necessary to use an expansion joint, and various problems related to the expansion joint can be avoided.
[Explanation of symbols]
　１１は蓄熱室、１２は燃焼室、１３はテンションビーム、１４は熱風支管、１５は熱風支管第１水平部、１６は熱風支管垂直部、１７は熱風支管第２水平部、１８は熱風本管、Ａは伸縮継手 11 is a heat storage chamber, 12 is a combustion chamber, 13 is a tension beam, 14 is a hot air branch pipe, 15 is a hot air branch pipe first horizontal part, 16 is a hot air branch pipe vertical part, 17 is a hot air branch pipe second horizontal part, and 18 is a hot air main pipe , A is an expansion joint

Claims (8)

  1. 　高炉の環状管に接続される熱風本管と熱風炉本体との間に介装される熱風支管垂直部と熱風支管水平部を有する熱風支管を構築する高炉の熱風炉の熱風支管構築方法において、
    　熱風炉本体と熱風支管垂直部との熱風炉乾燥昇温時の熱膨張差δに対し、熱風支管垂直部の熱風炉本体への連結箇所の高さを、熱風炉本体の熱風支管垂直部への連結箇所の高さより、熱膨張差吸収代σ＝０．２δ~δ分、高くして熱風支管垂直部を初期据付することを特徴とする高炉の熱風炉の熱風支管構築方法。     In the method for constructing a hot air branch of a blast furnace, a hot air branch having a vertical portion and a horizontal portion of a hot air branch that is interposed between a hot air main tube connected to the annular tube of the blast furnace and the main body of the hot air furnace,
    For the difference in thermal expansion δ between the hot stove body and the hot air branch vertical section when the temperature of the hot stove is dried, the height of the connecting portion of the hot air branch vertical section to the hot stove body is changed to the hot air branch vertical section of the hot stove body. A hot blast branch construction method for a hot blast furnace in a blast furnace is characterized in that the vertical installation portion of the hot blast branch pipe is initially installed with a thermal expansion difference absorption margin σ = 0.2δ to δ higher than the height of the connecting portion.
  2. 　前記熱風支管垂直部を高さ調整可能な支承で支持し、前記熱風支管垂直部の初期据付けし、
    　据付け後、前記熱風支管垂直部を下降することで当該熱風支管垂直部と熱風炉本体との連結箇所を同じ高さにして当該熱風支管垂直部と熱風炉本体とを熱風支管上部水平部で連結し、
    　連結後、熱風炉乾燥昇温中の熱風炉本体及び熱風支管垂直部の熱膨張に応じて前記熱風支管垂直部の高さを調整する、
    　ことを特徴とする請求項１に記載の高炉の熱風炉の熱風支管構築方法。     The hot air branch pipe vertical part is supported by a height-adjustable support, the initial installation of the hot air branch pipe vertical part,
    After installation, the vertical part of the hot air branch pipe is lowered so that the connecting portion between the vertical part of the hot air branch pipe and the main body of the hot air furnace is the same height, and the vertical part of the hot air branch pipe and the main body of the hot air furnace are connected by the horizontal part of the upper part of the hot air branch pipe And
    After connection, adjust the height of the hot air branch vertical part according to the thermal expansion of the hot air furnace body and hot air branch vertical part during the hot air oven drying temperature rise,
    The hot air branch pipe construction method for a hot blast furnace of the blast furnace according to claim 1.
  3. 　熱風炉乾燥昇温後、前記熱風支管垂直部の高さを調整して前記熱膨張差δと熱膨張差吸収代σとの実熱膨張差δ−σを熱風支管上部水平部と熱風支管下部水平部とで等分又はほぼ等分にすることを特徴とする請求項２に記載の高炉の熱風炉の熱風支管構築方法。 After heating and drying in the hot air oven, the height of the vertical portion of the hot air branch pipe is adjusted to obtain the actual thermal expansion difference δ-σ between the thermal expansion difference δ and the thermal expansion difference absorption margin σ, and the hot air branch upper horizontal portion and the hot air branch lower portion The method of constructing a hot air branch pipe for a hot blast furnace of a blast furnace according to claim 2, wherein the horizontal part is equally divided or substantially equally divided.
  4. 　前記熱風支管垂直部と熱風炉本体とを熱風支管上部水平部で連結した後、前記熱風支管垂直部を上昇して熱風支管下部水平部を水平にした状態で当該熱風支管下部水平部内にレンガを積み、次いで前記熱風支管垂直部を下降して前記熱風支管上部水平部を水平にした状態で当該熱風支管上部水平部内にレンガを積むことを特徴とする請求項２に記載の高炉の熱風炉の熱風支管構築方法。 After connecting the hot air branch pipe vertical part and the hot air furnace main body at the hot air branch pipe upper horizontal part, the hot air branch pipe vertical part is raised and the hot air branch pipe lower horizontal part is leveled, and the brick is placed in the hot air branch pipe lower horizontal part. 3. A hot blast furnace for a blast furnace according to claim 2, wherein the hot air branch pipe vertical part is lowered and the hot air branch pipe upper horizontal part is leveled and bricks are stacked in the hot air branch upper horizontal part. Hot air branch construction method.
  5. 　前記熱風支管垂直部及び水平部の長さが、夫々の径の３倍以上としたことを特徴とする請求項１に記載の高炉の熱風炉の熱風支管構築方法。 The hot air branch pipe construction method for a hot blast furnace in a blast furnace according to claim 1, wherein the length of the vertical part and the horizontal part of the hot air branch pipe is at least three times the diameter of each.
  6. 　前記熱風支管垂直部の長さが、熱風支管垂直部の管径の３倍以上、６倍以下であることを特徴とする請求項５に記載の高炉の熱風炉の熱風支管構築方法。 The method for constructing a hot air branch of a hot blast furnace for a blast furnace according to claim 5, wherein the length of the vertical portion of the hot air branch pipe is not less than 3 times and not more than 6 times the diameter of the vertical portion of the hot air branch pipe.
  7. 　高炉の環状管に接続される熱風本管と熱風炉本体との間に介装される熱風支管垂直部と熱風支管水平部を有する熱風支管において、
    　熱風支管垂直部及び水平部の長さを、夫々の径の３倍以上としたことを特徴とする高炉の熱風炉の熱風支管。     In the hot air branch pipe having a hot air branch vertical part and a hot air branch horizontal part interposed between the hot air main pipe connected to the annular pipe of the blast furnace and the hot stove main body,
    A hot air branch pipe for a hot blast furnace of a blast furnace, characterized in that the length of the vertical part and the horizontal part of the hot air branch pipe is set to be three times or more of the respective diameters.
  8. 　前記熱風支管垂直部の長さが、熱風支管垂直部の管径の３倍以上、６倍以下であることを特徴とする請求項７に記載の高炉の熱風炉の熱風支管。 The hot air branch pipe of a hot blast furnace for a blast furnace according to claim 7, wherein a length of the vertical part of the hot air branch pipe is not less than 3 times and not more than 6 times a diameter of the vertical part of the hot air branch pipe.
PCT/JP2011/056121 2011-03-09 2011-03-09 Hot-blast branch pipe structure of blast furnace hot stove and hot-blast branch pipe WO2012120691A1 (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011068972A (en) * 2009-09-28 2011-04-07 Jfe Steel Corp Structure of hot-blast divided tube in hot-stove for blast furnace
JP2011068971A (en) * 2009-09-28 2011-04-07 Jfe Steel Corp Method for constructing hot-blast divided tube in hot-stove for blast furnace
CN103114167A (en) * 2013-02-21 2013-05-22 李富朝 Novel combined brick structure of self-locking sealed blast furnace warm air duct intersection
CN103114167B (en) * 2013-02-21 2014-04-23 郑州安耐克实业有限公司 Novel combined brick structure of self-locking sealed blast furnace warm air duct intersection
JP2017053030A (en) * 2015-09-08 2017-03-16 Ｊｆｅスチール株式会社 Construction method of air heating furnace and air heating furnace
JP2021025059A (en) * 2019-07-31 2021-02-22 日鉄エンジニアリング株式会社 Method of extending hot blast pipe and method of constructing additional hot blast stove
JP7247047B2 (en) 2019-07-31 2023-03-28 日鉄エンジニアリング株式会社 Method for extending hot air pipes and method for increasing the number of hot air furnaces
CN114580680A (en) * 2022-03-29 2022-06-03 广东韶钢松山股份有限公司 Maintenance method for external combustion type hot blast stove vault connecting pipe temperature field system
CN114580680B (en) * 2022-03-29 2023-01-06 广东韶钢松山股份有限公司 Maintenance method for external combustion type hot blast stove vault connecting pipe temperature field system

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CN103415629A (en) 2013-11-27

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