JP2007084856A - Method for removing remained pig iron in blast furnace - Google Patents

Method for removing remained pig iron in blast furnace Download PDF

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JP2007084856A
JP2007084856A JP2005272403A JP2005272403A JP2007084856A JP 2007084856 A JP2007084856 A JP 2007084856A JP 2005272403 A JP2005272403 A JP 2005272403A JP 2005272403 A JP2005272403 A JP 2005272403A JP 2007084856 A JP2007084856 A JP 2007084856A
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residue
block
furnace
wire saw
residue block
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JP4758717B2 (en
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Hiroshi Takasaki
洋 高崎
Yuichi Takeda
裕一 竹田
Yuji Sudo
雄二 須藤
Koji Hamada
孝司 濱田
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Nippon Steel Engineering Co Ltd
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Nippon Steel Engineering Co Ltd
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Priority to JP2005272403A priority Critical patent/JP4758717B2/en
Priority to CN2006800346681A priority patent/CN101268202B/en
Priority to PCT/JP2006/318890 priority patent/WO2007034928A1/en
Priority to BRPI0616162-6A priority patent/BRPI0616162B1/en
Priority to KR1020087006634A priority patent/KR100982602B1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/12—Opening or sealing the tap holes
    • 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
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1694—Breaking away the lining or removing parts thereof

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Blast Furnaces (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for removing remained pig iron with which in the case of performing the repair of a blast furnace, the remained and solidified pig iron in the furnace bottom can safely be removed in a short term by using a wire saw. <P>SOLUTION: In the method for removing the remained pig iron, with which the solidified pig iron 1 remained in the furnace bottom is pulled out to out of the furnace and removed as a divided remained pig iron block 1a, when the repair of the blast furnace is performed; an iron shell at the position for pulling out the divided remained pig iron block, is removed and a penetrating hole under the remained pig iron, is bored in order to insert the wire saw 6 into a furnace bottom refractory under the remained pig iron. Then, the wire saw is inserted through the penetrating hole under the remained pig iron, and wound on the outer periphery of the remained pig iron, and the remained pig iron and the furnace bottom refractory 2 are cut off in the perpendicular direction by using the wire saw and divided into a plurality of remained pig iron blocks and the remained pig iron block is pulled out to out of the furnace. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

高炉の改修を行う際に、炉底に残留する、冷却により固化した残銑を短期間で且つ安全に撤去することができる残銑の撤去方法に関する。   The present invention relates to a method for removing residues that can be removed in a short period of time and safely after the blast furnace is refurbished.

高炉の改修を行う場合に、高温溶融状態となっている炉内内容物へ注水することにより内容物を冷却固化させる。この固化された内容物は炉底部に残留する。内容物のうち比重の高い残銑が炉底に残留し一体化されており、その重量は３００トンから２０００トンに及ぶ。この炉底に残留する残銑の撤去は、高炉本体を解体する上で不可欠な工程であり、高炉の改修を行う場合のクリティカルパスとなる。この残銑撤去が予定通り進まずに改修工期の遅延を引き起こした例は過去に多くあり、極めて難度の高い作業である。   When refurbishing the blast furnace, the contents are cooled and solidified by pouring water into the furnace contents that are in a high-temperature molten state. This solidified content remains at the bottom of the furnace. Residue with high specific gravity remains in the furnace bottom and is integrated, and its weight ranges from 300 to 2000 tons. The removal of the residue remaining at the bottom of the furnace is an indispensable process for dismantling the blast furnace body, and becomes a critical path when the blast furnace is repaired. There have been many cases in which the removal of the ruins did not proceed as planned and caused a delay in the repair period, which is a very difficult task.

残銑は比重が大きく且つ硬度が高いため、短時間で小割する方法として、従来から発破による破砕手段が最も適していると考えられ、現在まで長年に亘り発破による残銑解体が行われている。従って、高炉改修における残銑撤去工法で開発された技術は、発破で残銑を効率的に破砕し撤去する手段であり、またそれに関わる技術、並びにその機械化である（特許文献１参照）。   Since the residue has a high specific gravity and high hardness, it has been considered that crushing means by blasting is the most suitable method for breaking up in a short period of time. Yes. Therefore, the technology developed by the residue removal method in the blast furnace renovation is a means for efficiently crushing and removing the residue by blasting, and the technology related thereto and mechanization thereof (see Patent Document 1).

図６ａは従来の発破による残銑撤去方法のイメージ図、図６ｂは発破による残銑小割りの一例を示す平面図である。高炉の外周を囲む鉄皮４の内周面に耐火煉瓦が内張され、炉底に耐火煉瓦が積層されて炉底耐火物２が形成されている。   FIG. 6a is an image diagram of a conventional method for removing residues by blasting, and FIG. 6b is a plan view showing an example of a residue split by blasting. A refractory brick is lined on the inner peripheral surface of the iron skin 4 surrounding the outer periphery of the blast furnace, and the refractory brick 2 is formed by laminating the refractory brick on the furnace bottom.

高炉改修の際には、冷却により固化した残銑１を撤去するために、炉底部の鉄皮の対面方向に２箇所を開口して高さ４ｍ×幅４ｍ程度の鉄皮開口部５を形成して残銑１を露出させる。露出させた残銑１に残銑穿孔機１５のドリルによりで発破用穴を穿孔する。発破用孔の深度は１．５ｍ程度である。この発破用穴に爆薬を装填し、発破させて小割りする。小割りされた残銑１をブルドドーザーショベルなどの重機１６を使用して掻き出すことにより搬出する。以上の作業により残銑外周部の鉄皮開口位置から順次炉の中心方向へと進んで図６ｂに示す数字（１）から順に小割りを繰り返して撤去を行う。
特開２０００−２５６７１７号公報 At the time of blast furnace renovation, in order to remove the residue 1 solidified by cooling, two openings are formed in the facing direction of the iron core at the bottom of the furnace to form an iron core opening 5 having a height of about 4 m and a width of about 4 m. Then, the residue 1 is exposed. A blasting hole is drilled in the exposed residue 1 with a drill of the residue punch 15. The depth of the blasting hole is about 1.5 m. The explosive is loaded into this blasting hole, blasted and subdivided. The small residue 1 is carried out by scraping it using a heavy machine 16 such as a bulldozer excavator. As a result of the above operations, the process proceeds sequentially from the opening position of the iron shell on the outer periphery of the residue to the center of the furnace, and the subdivision is repeated in order from the number (1) shown in FIG.
JP 2000-256717 A

しかしながら、従来の発破による残銑の撤去作業は、１回の発破による残銑解体による炉心方向への掘進量は、残銑外周から１．５ｍ程度であり、残銑中心に到達するためには、残銑中心までの距離に応じた回数の発破を行わなければならない。また炉心方向へ進むにつれて切り羽の面積が広くなることから、切り羽全面を１．５ｍの距離を掘進させるためには、多くの発破用孔の穿孔と発破回数が必要となる。このため、残銑量に左右されるが、残銑撤去完了まで極めて長い時間を要しており、過去の実績で例えれば、３００トンの残銑を発破で小割りして撤去する場合、約７日間を必要とし、また、１５００トンの残銑の場合、約１４日間を要していた。   However, the removal work of the residue by the conventional blasting is about 1.5m from the outer periphery of the residue due to the demolition of the residue by one blasting, and in order to reach the center of the residue The blast must be carried out a number of times depending on the distance to the center of the ruins. Further, since the area of the cutting face becomes wider as it goes in the direction of the core, in order to dig a distance of 1.5 m over the entire cutting face, a large number of holes for blasting and the number of times of blasting are required. For this reason, although it depends on the amount of residue, it takes a very long time to complete the removal of the residue, and in the past results, when removing 300 tons of residue by blasting, It took 7 days, and about 1500 tons, it took about 14 days.

また、発破による残銑の撤去方法は、危険を伴うものであるから、万全の安全対策が必要となる。また、残銑を発破で小割り破砕する場合、発破時の爆風や残銑小片の飛散などで周辺設備の損傷が生じるため、損傷設備の補修が必要となつていた。この周辺設備の損傷防止のため、小割りした残銑搬出用の鉄皮開口部は、飛散防止養生用の仮設設備を設置するなど、安全対策設備に多くの費用を投じている。   Moreover, since the method of removing the residue by blasting involves danger, thorough safety measures are required. In addition, when crushing the residue by blasting, the peripheral equipment was damaged due to the blast at the time of the blasting and the scattering of the small pieces of the residue, so it was necessary to repair the damaged equipment. In order to prevent damage to the peripheral equipment, a large portion of the iron opening for carrying out the small residue is invested in safety measures such as setting up temporary equipment to prevent scattering.

通常撤去するマンテルを残銑周囲に配置することで、飛散防止用の防護壁として活用しているが、マンテルを流用する場合は発破によるマンテルの損傷防止の防護壁を施す必要があり、膨大な養生費用を投じていた。   Normally, mantels to be removed are placed around the remnants and used as protective walls to prevent scattering. However, when diverting mantels, it is necessary to provide protective walls to prevent mantel damage caused by blasting. He spent a curing cost.

また、発破作業による周辺作業者の安全を確保するために、発破作業時間帯は周辺作業を一時的に中断させ、作業者を退避させるなど、周辺作業の時間的ロスを余儀なくされていた。例えば、発破作業による周辺作業の作業者の退避開始は、発破実施の１時間前から開始し、発破完了後の火薬不発確認などの安全であることが確認されるまでの２時間程度であり、例えば２０回の発破を行う場合は、発破毎に退避が繰り返されるため、周辺作業のロス時間は４０時間程度となっている。   Also, in order to ensure the safety of surrounding workers due to the blasting work, the blasting work time zone was forced to temporarily lose the surrounding work, such as temporarily suspending the surrounding work and evacuating the worker. For example, the evacuation start of the worker of the peripheral work by the blasting work starts about one hour before the blasting execution and is about two hours until it is confirmed that the explosives are not confirmed after the blasting is completed. For example, when performing blasting 20 times, evacuation is repeated for each blasting, so the loss time of the peripheral work is about 40 hours.

そこで、本発明は、高炉の改修を行う際に、ワイヤーソーを使用して炉底に残留する固化した残銑を短期間で且つ安全に撤去することができる残銑の撤去方法を提供するものである。   Then, this invention provides the removal method of the residue which can remove the solidified residue which remain | survives in a furnace bottom using a wire saw in a short period of time safely when repairing a blast furnace. It is.

本発明の残銑の撤去方法は、高炉の改修を行う際に、炉底に残留する固化した残銑を分割した残銑ブロックとして炉外へ引き出して撤去する残銑の撤去方法において、分割した残銑ブロックを引き出す部分の鉄皮を除去し、残銑下の炉底耐火物にワイヤーソーを挿通する残銑下貫通孔を穿孔し、残銑下貫通孔にワイヤーソーを挿通し、ワイヤーソーを残銑の外周に巻きつけ、ワイヤーソーを走行させて残銑と炉底耐火物を垂直方向に切断して複数の残銑ブロックに分割し、残銑ブロックを炉外へ引き出すことを特徴とする。   The residue removal method of the present invention was divided in the residue removal method in which the solidified residue remaining in the bottom of the furnace was pulled out of the furnace as a divided residue block and removed when the blast furnace was repaired. Remove the iron skin from the part where the residue block is pulled out, drill a bottom through-hole for inserting the wire saw into the bottom refractory under the residue, insert the wire saw through the bottom bottom through-hole, Is wrapped around the outer periphery of the residue, a wire saw is run, the residue and the bottom refractory are cut vertically, divided into a plurality of residue blocks, and the residue block is pulled out of the furnace To do.

残銑の切断は、残銑ブロックの引き出し方向に平行の分割線、または引き出し方向に末広がりの分割線に沿って残銑と炉底耐火物を垂直方向に切断して複数のブロックに分割したり、あるいは、ワイヤーソーを挿通する残銑下貫通孔を残銑ブロックの引き出し方向と直交する方向に穿孔し、残銑ブロックの引き出し方向と直交する方向の分割線に沿って残銑と炉底耐火物を垂直方向に切断して二つの残銑ブロックに分割したりすることができる。また、任意の複数の分割線を複数のワイヤーソーで並行して切断してもよい。さらに、残銑を切断する際に、ワイヤーソーが走行する経路に冷却流体を連続的に供給してワイヤーソーを冷却しながら切断してもよい。   Residue cutting can be performed by cutting the residue and the bottom refractory in a vertical direction along a dividing line parallel to the pulling direction of the remaining block or a dividing line extending in the pulling direction to divide the block into a plurality of blocks. Alternatively, the bottom bottom through-hole through which the wire saw is inserted is drilled in a direction perpendicular to the direction in which the residue block is drawn, and the residue and the furnace bottom fireproof along the dividing line in the direction perpendicular to the direction in which the residue block is drawn. The object can be cut vertically and divided into two remnant blocks. Moreover, you may cut | disconnect arbitrary some dividing lines in parallel with a some wire saw. Furthermore, when cutting a residue, you may cut | disconnect, cooling a wire saw by supplying a cooling fluid continuously to the path | route which a wire saw travels.

また、残銑ブロックを炉外へ引き出すに際し、引き出す残銑ブロックの底面と同じレベルに残銑ブロックの搬出用台車又は残銑ブロックの搬出用架台の上面レベルを合わせて残銑ブロックの横に設置し、残銑ブロックに水平力を与えて残銑ブロックと残留する炉底耐火物間に滑りを生じさせて残銑ブロックを水平方向に横移動させて引き出して残銑ブロックの搬出用台車又は残銑ブロックの搬出用架台上に積載したり、あるいは残銑ブロックをジャッキアップし、残銑ブロックと残留する炉底耐火物の間に形成された空間に残銑ブロックを積載する移動装置を残銑ブロックの下部に配置し、残銑ブロックをジャッキダウンして移動装置上に積載し、残銑ブロックを積載した移動装置を水平移動させて残銑ブロックを炉外へ引き出してもよい。   Also, when pulling out the residue block outside the furnace, install it next to the residue block by aligning the top level of the residue block carry-out carriage or residue block carry-out stand with the same level as the bottom of the residue block to be drawn out. Then, a horizontal force is applied to the residue block to cause slippage between the residue block and the remaining furnace bottom refractory, and the residue block is moved horizontally in the horizontal direction and pulled out to draw out the residue block carriage or residue. A mobile device for loading the residue block into the space formed between the residue block and the remaining refractory at the bottom of the furnace is loaded by loading the residue block on a stand for carrying out or jacking up the residue block. It may be arranged at the lower part of the block, the residue block may be jacked down and loaded on the moving device, and the moving device loaded with the residue block may be moved horizontally to draw the residue block out of the furnace.

本発明の残銑の撤去方法は、ワイヤーソーを使用して残銑を切断して大きな残銑ブロックにし、この残銑ブロックを炉外へ引き出すことにより、従来の発破により小割りした残銑を撤去する方法に比べて、残銑を短期間で確実に撤去することができる。   The residue removal method of the present invention uses a wire saw to cut the residue into a large residue block, and pulls the residue block out of the furnace, thereby removing the residue that has been broken by conventional blasting. Compared with the removal method, the residue can be removed reliably in a short period of time.

また、ワイヤーソーによる残銑切断部の隙間は１０ｍｍ程度で、切断後の残銑ブロック間のクリアランスは狭いが、切断面は平滑であり、ブロック間の残銑を引き出す場合においても隣り合うブロック間の凹凸などによる引っ掛かりはなく、またブロック間で接触しても切断面が滑るために、残銑ブロックを容易に引き出すことができる。このことから分割を大きくした残銑ブロックを一度に撤去することも可能となる。なお、分割線を引き出し方向の残銑ブロックの幅を広く取って末広がりにすることで抜き代が形成されて、隣接する残銑ブロックとの接触がなくなり円滑な引き出しができる。   In addition, the gap between the residue cutting portions by the wire saw is about 10 mm, and the clearance between the residue blocks after cutting is narrow, but the cut surface is smooth, and even when pulling out the residues between the blocks, between adjacent blocks Since there is no catch due to the unevenness, and the cut surface slips even when contacting between the blocks, the residual block can be easily pulled out. For this reason, it is possible to remove a residual block having a large division at a time. In addition, by taking the width of the remaining block in the pull-out direction so that the dividing line is widened, a cutting allowance is formed, and there is no contact with the adjacent remaining block, and smooth pull-out can be performed.

また、本発明による残銑の撤去方法は、残銑の全断面をワイヤーソーで切断するため、発破で小割りする場合に工程進捗の管理に影響を及ぼす残銑の撤去深度等を考慮する必要がないので、撤去作業の管理が簡単である。   In addition, since the method for removing residue according to the present invention cuts the entire cross section of the residue with a wire saw, it is necessary to consider the removal depth of the residue that affects the management of the process progress when subdividing by blasting Because there is no, management of removal work is easy.

本発明のワイヤーソーによる残銑の撤去方法は、発破を行わないために爆風、残銑小片の飛散がなく安全であり、さらに、これらに対する防護壁を設置するなどの仮設費用が軽減されるため、経済効果も極めて大きい。     The method of removing the residue using the wire saw of the present invention is safe because there is no blast and scattering of the small pieces of residue because blasting is not performed, and furthermore, temporary costs such as installing a protective wall against these are reduced. The economic effect is also extremely large.

本発明では、冷却固化して間もない高熱の残銑を、ワイヤーソーが走行する経路に冷却流体を連続的に供給してワイヤーソーを冷却することによって、切断することが可能となり、工期を短縮することができる。   In the present invention, it becomes possible to cut the high-temperature residue that has just been cooled and solidified by continuously supplying a cooling fluid to the path where the wire saw travels and cooling the wire saw. It can be shortened.

本発明の撤去方法では、残銑の分割数にかかわらず複数台のワイヤーソーマシンを準備することで、一度に多くの面を切断することができるため、任意の複数の面を切断する時間はほとんど変わらず能率的な解体が可能となる。   In the removal method of the present invention, by preparing a plurality of wire saw machines regardless of the number of residues divided, it is possible to cut many faces at once, so the time to cut any plurality of faces is Efficient dismantling is possible almost unchanged.

残銑ブロックを炉外へ引き出すに際し、搬出用台車又は残銑ブロックの搬出用架台残銑ブロックの横に設置して残銑ブロックを積載したり、残銑ブロックをジャッキアップし、移動装置に残銑ブロックを積載して炉外へ引き出すことにより、残銑ブロックの搬出が容易になる。   When the residue block is pulled out of the furnace, it is placed next to the unloading carriage or the unloading stand residue block of the residue block and loaded with the residue block, or the residue block is jacked up and left in the mobile device. By loading the soot block and pulling it out of the furnace, the residue block can be easily carried out.

本発明の実施例を、図面を用いて説明する。   Embodiments of the present invention will be described with reference to the drawings.

本実施例による残銑の撤去方法は、残銑をワイヤーソーで切断して複数に分割した残銑ブロックを炉外へ引き出す例である。   The residue removal method according to the present embodiment is an example in which a residue block obtained by cutting the residue with a wire saw and dividing it into a plurality of pieces is pulled out of the furnace.

図１ａは鉄皮を取り除いた状態及び残銑の分割線の一例を示す平面図、図１ｂは炉底耐火物に貫通孔を穿孔する状態を示す概略図、図１ｃはワイヤーソーで残銑を切断している状態を示す概略図、図２はワイヤーソーの概略図である。   FIG. 1a is a plan view showing an example of a state in which the iron skin has been removed and a parting line of the residue, FIG. 1b is a schematic view showing a state in which a through hole is drilled in the bottom refractory, and FIG. 1c is a wire saw. The schematic which shows the state which has cut | disconnected, FIG. 2 is the schematic of a wire saw.

高炉の改修の際、注水により冷却固化した残銑１がカーボン煉瓦等の積構造からなる炉底耐火物２の上に残留する。残銑１の表面に残留していたスラグ３も冷却固化されて付着している。   At the time of refurbishing the blast furnace, the residue 1 cooled and solidified by pouring water remains on the furnace bottom refractory 2 made of a stacked structure such as carbon brick. The slag 3 remaining on the surface of the residue 1 is also cooled and solidified.

本実施例の撤去方法の工程について説明する。   The process of the removal method of a present Example is demonstrated.

（１）鉄皮の除去
炉体下部の残銑１の位置で且つ対向する位置の鉄皮４を取り除いて鉄皮開口部５を設ける。一方の鉄皮開口部５はワイヤーソー６が出入りするワイヤーソーマシン７の操作側となる。他方の開口部５は分割した残銑ブロック１ａの引き出し側（矢印）となり、残銑ブロック１ａが引き出せる大きさに開口される。 (1) Removal of the iron skin The iron skin 4 at the position of the residue 1 at the lower part of the furnace body and the opposite position is removed to provide the iron skin opening 5. One iron skin opening 5 serves as an operation side of the wire saw machine 7 through which the wire saw 6 enters and exits. The other opening 5 is on the drawing side (arrow) of the divided residue block 1a and is opened to a size that allows the residue block 1a to be drawn.

（２）残銑下貫通孔の穿孔
図１ｂに示すように、残銑１にワイヤーソー６を巻き付けるため、残銑１の下方ヘワイヤーソー６を通す必要があるので、残銑１の下にある炉底耐火物２の任意のレベルに残銑下貫通孔８をボーリングマシン９により形成する。残銑下貫通孔８は、例えば、ワイヤーソーの外径が約１１ｍｍの場合、約６５ｍｍにしてワイヤーソー６が無理なく走行できる径にする。 (2) Perforation of the bottom bottom through-hole As shown in FIG. 1b, since the wire saw 6 needs to be passed through the bottom of the bottom 1 in order to wind the wire saw 6 around the bottom 1, the furnace under the bottom 1 A bottom bottom through-hole 8 is formed by a boring machine 9 at an arbitrary level of the bottom refractory 2. For example, when the outer diameter of the wire saw is about 11 mm, the residual bottom through-hole 8 is set to about 65 mm so that the wire saw 6 can travel without difficulty.

（３）ワイヤーソーによる切断
ワイヤーソー６は広く知られており、図２に示すように、台金とダイヤモンドビーズなどの砥粒層からなるビーズ６ａを金属撚線であるワイヤーロープに間隔をおいて設け、ビーズ間を樹脂やゴム６ｂでワイヤーロープを被覆したものである。本発明では、ワイヤーソーとして、例えば、地下鉄、ビル、道路、橋梁などの解体、改修に使用される「株式会社アライドマテリアル製品番ＥＷＬＳ−２５５」を使用することができる。 (3) Cutting with a wire saw The wire saw 6 is widely known. As shown in FIG. 2, a bead 6a made of an abrasive layer such as a base metal and a diamond bead is spaced from a wire rope that is a metal stranded wire. The wire rope is covered with resin or rubber 6b between the beads. In the present invention, for example, “Allied Material Product No. EWLS-255” used for dismantling and repairing subways, buildings, roads, bridges and the like can be used as the wire saw.

残銑下貫通孔８は、ワイヤーソー６のダイヤモンドビーズ６ａの目詰まり防止の観点から、残銑１と同時に極力多くの炉底耐火物２を切断することが好ましいので、炉底耐火物２の下方で炉底の底板に近いレベルで穿孔するのがよい。ワイヤーソー６で金属のみを切断する場合は、ワイヤーソー６のダイヤモンドビーズ６ａに金属が付着し、ワイヤーに連珠されたビーズ間に目詰まりを生じ、切断が困難となる。しかしながら、炉底耐火物２を同時に切断することにより目詰まりを生じることなく、良好な切断が可能となる。これは、炉底耐火物２の切粉には、ダイヤモンドビーズ６ａへの付着性、または粘着性がなく、この付着性のない切粉が介在することにより、残銑１の切粉がダイヤモンドビーズに付着せずに常時ダイヤモンドビーズ６ａが刃の機能を維持しているものと考えられる。   From the viewpoint of preventing clogging of the diamond beads 6 a of the wire saw 6, it is preferable that the bottom bottom through-hole 8 cuts as many furnace bottom refractories 2 as possible simultaneously with the residue 1. It is better to drill at a level close to the bottom plate at the bottom of the furnace. When only the metal is cut with the wire saw 6, the metal adheres to the diamond beads 6 a of the wire saw 6, causing clogging between the beads connected to the wire, and cutting becomes difficult. However, by cutting the furnace bottom refractory 2 at the same time, good cutting is possible without causing clogging. This is because the chips of the furnace refractory 2 have no adhesion or stickiness to the diamond beads 6a, and the non-adhesive chips are present, so that the chips of the residue 1 become diamond beads. It is considered that the diamond beads 6a always maintain the function of the blade without adhering to the surface.

炉底耐火物２に穿孔された残銑下貫通孔８にワイヤーマシーン７のワイヤーソー６の先端を挿通し、さらに残銑１の上に回して残銑１に巻き付ける。ワイヤーソー６の走行速度は、２０ｍ／秒未満では効率的な切断が困難となり、３０ｍ／秒を超えるとワイヤーソー６の切断が多くなるので、２０ｍ／秒〜３０ｍ／秒の範囲が好ましい。   The tip of the wire saw 6 of the wire machine 7 is inserted into the bottom bottom through-hole 8 drilled in the furnace bottom refractory 2 and is further wound around the bottom 1 to be wound around the bottom 1. When the traveling speed of the wire saw 6 is less than 20 m / second, efficient cutting becomes difficult, and when the wire saw 6 exceeds 30 m / second, the wire saw 6 is frequently cut. Therefore, a range of 20 m / second to 30 m / second is preferable.

ワイヤーソー６で切断する残銑１の分割は、図１ａに示すように、平面的に見て、引き出し方向に平行の分割線１０、または、引き出し方向に末広がりの分割線１１に沿って垂直方向に切断し、２以上の複数の残銑ブロック１ａに分割する。   As shown in FIG. 1a, the residue 1 cut by the wire saw 6 is divided in a vertical direction along a dividing line 10 parallel to the drawing direction or a dividing line 11 spreading toward the end in the drawing direction. And is divided into two or more residual blocks 1a.

（４）残銑ブロックの引き出し
分割した残銑ブロック１ａは、残銑の引出側端部に、図１ｄ、図１ｅに示すように、コアーボーリングで上下方向の貫通孔１ｂを設け、貫通孔１ｂにワイヤー１２ｂを通して油圧ジャッキ１２ａにより引き出す。炉底耐火物２は引き出しの際の大きな引き出し力により剥離あるいは崩れて分離される。 (4) Pulling out residue block As shown in FIGS. 1d and 1e, the divided residue block 1a is provided with a through-hole 1b in the vertical direction by core boring, as shown in FIGS. 1d and 1e. And is pulled out by the hydraulic jack 12a through the wire 12b. The furnace refractory 2 is separated or collapsed by a large pulling force during pulling.

残銑ブロックを炉外へ引き出すに際し、引き出す残銑ブロックの底面と同じレベルで搬出用台車又は搬出用架台の上面レベルを合わせて残銑残銑ブロックの横に設置し、残銑ブロックに水平力を与えて炉底耐火物上の残銑と炉底耐火物間に滑りを生じさせて残銑ブロックを水平方向に横移動させて引き出し、搬出用台車又は搬出用架台上に積載して、搬出する。   When the residue block is pulled out of the furnace, it is installed next to the residue block with the same level as the bottom surface of the residue block to be pulled out and the top surface level of the unloading carriage, and horizontal force is applied to the residue block. To create a slip between the residue on the bottom refractory and the bottom refractory, horizontally move the residue block, pull it out, and load it on the unloading cart or unloading platform. To do.

表１に本発明によるワイヤーソーによる撤去方法と従来の発破により小割りして撤去する方法の撤去期間を比較する。なお、本発明によるワイヤーソーによる撤去方法は、残銑量３００トンでは３分割、残銑量１５００トンでは５分割した例である。

Figure 2007084856
Table 1 compares the removal period of the wire saw removal method according to the present invention and the conventional method of breaking and removing by blasting. The removal method using the wire saw according to the present invention is an example in which the residue amount is 300 tons and the residue amount is 1500 tons and the residue amount is 1500 tons.
Figure 2007084856

表１から、本発明による撤去方法により、従来の撤去方法に比べて撤去期間が大幅に短縮できた。   From Table 1, the removal method according to the present invention significantly shortened the removal period compared to the conventional removal method.

本実施例は残銑を２分割して撤去するもので、図３ａは本実施例の残銑の分割線及び引き出し方向を示す平面図、図３ｂは別実施例の残銑の分割線及び引き出し方向を示す平面図である。   In this embodiment, the residue is divided into two parts and removed. FIG. 3A is a plan view showing the dividing line and the drawing direction of the residue in this embodiment, and FIG. 3B is the dividing line and the drawing line of the residue in another embodiment. It is a top view which shows a direction.

残銑１の位置の鉄皮４を取り除いて残銑を引き出す側に鉄皮開口部５を設ける。鉄皮開口部５は、２分された残銑ブロック１ａが引き出せる大きさに開口する。   An iron skin opening 5 is provided on the side from which the iron skin 4 at the position of the residue 1 is removed and the residue is drawn out. The iron skin opening 5 opens to a size that allows the two-part residue block 1a to be pulled out.

ワイヤーソーで切断する残銑１の分割線１０は、平面的に見て、引き出し方向と直交する直径方向にし、残銑１を分割線に沿って垂直方向に切断して２分割する。   The dividing line 10 of the residue 1 cut by the wire saw is formed in a diametrical direction perpendicular to the pulling direction when seen in a plan view, and the residue 1 is cut in the vertical direction along the dividing line and divided into two.

炉底耐火物２の任意のレベルに残銑１の下方ヘワイヤーソーを通す残銑下貫通孔８を引き出し方向と直交する直径方向に穿孔する。   A residual bottom through hole 8 through which the lower wire saw of the residual residue 1 is passed through an arbitrary level of the furnace bottom refractory 2 is formed in a diameter direction perpendicular to the pulling direction.

炉底耐火物２に穿孔された残銑下貫通孔８にワイヤーソーの先端を挿通し、さらに残銑１の上に回して残銑１に巻き付けた後、ワイヤーソーで残銑を切断し、分割した残銑ブロック１ａは、ワイヤーロープを掛けて高炉外に矢印方向へ引き出す。   Insert the tip of the wire saw through the bottom bottom through-hole 8 drilled in the furnace bottom refractory 2, turn the top of the wire saw 1 and wind it around the residue 1, then cut the residue with a wire saw, The divided residue block 1a is pulled out of the blast furnace in the direction of the arrow by hanging a wire rope.

なお、図３ｂに示すように、残銑１の回りの鉄皮をすべて撤去した場合には、残銑ブロック１ａは矢印で示す任意の方向へ引き出すことができる。   In addition, as shown in FIG. 3b, when all the iron shells around the residue 1 are removed, the residue block 1a can be pulled out in an arbitrary direction indicated by an arrow.

本実施例では、残銑１を２分割して引き出すので、残銑量が比較的少ない場合には有効である。   In the present embodiment, the residue 1 is extracted by dividing it into two, which is effective when the amount of residue is relatively small.

図４ａは分割された残銑ブロックの引き出しの例を示す正面図、図４ｂ平面図である。   FIG. 4A is a front view showing an example of the drawer of the divided residual block, and FIG. 4B is a plan view.

ワイヤーソーで残銑を分割した後、引き出す残銑ブロック１ａをジャッキアップし、残銑ブロック１ａの下に引き出し架台１２を延長し、スライドプレート１３を引き出し架台１２上を移動させて残銑ブロック１ａの下に配置した後、残銑ブロック１ａをスライドプレート１３に載せる。次いで、残銑ブロック１ａを載せたスライドプレート１３を引き出して架台１２上を油圧ジャッキ１２ａにより引き出し方向にスライドさせる。なお、スライドプレート１３に代えて、台車などのその他の移動装置を使用することができる。   After dividing the residue with a wire saw, jack up the residue block 1a to be pulled out, extend the drawer frame 12 under the residue block 1a, and move the slide plate 13 over the drawer frame 12 to leave the residue block 1a. After that, the residue block 1 a is placed on the slide plate 13. Next, the slide plate 13 on which the residue block 1a is placed is pulled out and slid on the gantry 12 in the pulling direction by the hydraulic jack 12a. In addition, it can replace with the slide plate 13 and can use other moving apparatuses, such as a trolley | bogie.

本実施例では、分割された残銑ブロックを炉底耐火物を剥離あるいは崩して分離して炉底耐火物上を移動させて引きずり出すのに比べて、少ない力で引き出すことができる。   In this embodiment, the divided residue block can be pulled out with less force compared to separating and breaking the bottom refractory and moving it over the bottom refractory and dragging it out.

ワイヤーソーで切断する際にワイヤーソーを冷却することにより、温度の高い残銑の切断が可能となる。炉内で注水冷却により冷却・固化された残銑の熱容量は大きく、数日経過してもなお残銑温度は高い。例えば、注水冷却完了後７日経過しても、残銑自体の温度は通常６００℃以上の温度となっている。一方、ワイヤーソーのゴム又は樹脂部分は一般的に２００℃以下の耐熱温度であり、温度の高い残銑を切断するために必要な耐熱性がないため、そのまま残銑を切断することは困難である。   By cutting the wire saw when cutting with a wire saw, it is possible to cut the residue having a high temperature. The heat capacity of the residue cooled and solidified by water injection in the furnace is large, and the residue temperature is still high even after several days. For example, the temperature of the residue itself is normally 600 ° C. or higher even after 7 days have passed since the completion of the water injection cooling. On the other hand, the rubber or resin part of the wire saw generally has a heat-resistant temperature of 200 ° C. or less, and does not have the heat resistance necessary for cutting high temperature residue, so it is difficult to cut the residue as it is. is there.

そこで、この高熱の残銑を、ワイヤー強度を確保しつつ切断するために、ワイヤーが高温の残銑と接触する切断面、並びにワイヤーが高温部を通過する範囲を、冷却水や冷却窒素などの冷却流体を連続的に供給することで抜熱を行ないながら残銑を切断することで、ワイヤーソーによる残銑の切断が可能となる。   Therefore, in order to cut the high-temperature residue while securing the wire strength, the cutting surface where the wire comes into contact with the high-temperature residue, and the range in which the wire passes through the high-temperature part, such as cooling water or cooling nitrogen By cutting the residue while removing heat by continuously supplying the cooling fluid, the residue can be cut by a wire saw.

図５に示すように、切断開始後に切断端部をモルタル１４で塞いで行くことにより、供給される冷却流体を効率よく利用することができる。   As shown in FIG. 5, the cooling fluid supplied can be used efficiently by closing the cut end with mortar 14 after the start of cutting.

鉄皮を取り除いた状態及び残銑の分割線の一例を示す平面図である。It is a top view which shows an example of the state which removed the iron skin, and the dividing line of a residue. 炉底耐火煉瓦に貫通孔を穿孔する状態を示す概略図である。It is the schematic which shows the state which drills a through-hole in a furnace bottom refractory brick. ワイヤーソーで残銑を切断している状態を示す概略図であるIt is the schematic which shows the state which is cutting the residue with a wire saw 引き出しの一例を示す概略図である。It is the schematic which shows an example of drawer | drawer. 引き出しの一例を示す概略図である。It is the schematic which shows an example of drawer | drawer. ワイヤーソーの概略図である。It is the schematic of a wire saw. 本実施例の残銑の分割線及び引き出し方向を示す平面図である。It is a top view which shows the parting line and extraction direction of the residue of a present Example. 別実施例の残銑の分割線及び引き出し方向を示す平面図である。It is a top view which shows the dividing line of the residue of another Example, and the drawing-out direction. 分割された残銑ブロックの引き出しの例を示す正面図である。It is a front view which shows the example of drawer | drawing-out of the divided residue block. 分割された残銑ブロックの引き出しの例を示す平面図である。It is a top view which shows the example of drawer | drawing-out of the divided residue block. 切断端部をモルタルで塞いだ状態を示す概略図である。It is the schematic which shows the state which closed the cutting | disconnection edge part with the mortar. 従来の発破による残銑撤去作業のイメージ図である。It is an image figure of the residue removal work by the conventional blasting. 発破による残銑小割りの一例を示す平面図である。It is a top view which shows an example of the residue subdivision by blasting.

符号の説明Explanation of symbols

１：残銑
１ａ：残銑ブロック
１ｂ：貫通孔
２：炉底耐火物
３：スラグ
４：鉄皮
５：鉄皮開口部
６：ワイヤーソー
６ａ：ビーズ
６ｂ：樹脂やゴム
７：ワイヤーソーマシン
８：残銑下貫通孔
９：ボーリングマシン
１０，１１：分割線
１２：引き出し架台
１２ａ：油圧ジャッキ
１２ｂ：ワイヤー
１３：スライドプレート
１４：モルタル
１５：残銑穿孔機
１６：重機 1: Residue 1a: Residual block 1b: Through-hole 2: Furnace bottom refractory 3: Slag 4: Iron skin 5: Iron skin opening 6: Wire saw 6a: Bead 6b: Resin and rubber 7: Wire saw machine 8 : Remaining bottom through-hole 9: Boring machine 10, 11: Dividing line 12: Drawer base 12a: Hydraulic jack 12b: Wire 13: Slide plate 14: Mortar 15: Remnant punch 16: Heavy machinery

Claims (7)

高炉の改修を行う際に、炉底に残留する固化した残銑を分割した残銑ブロックとして炉外へ引き出して撤去する残銑の撤去方法において、
分割した残銑ブロックを引き出す部分の鉄皮を除去し、
残銑下の炉底耐火物にワイヤーソーを挿通する残銑下貫通孔を穿孔し、
残銑下貫通孔にワイヤーソーを挿通し、このワイヤーソーをさらに残銑の外周に巻きつけ、
ワイヤーソーを走行させて残銑と炉底耐火物を垂直方向に切断して複数の残銑ブロックに分割し、
残銑ブロックを炉外へ引き出すことを特徴とする残銑の撤去方法。 When renovating the blast furnace, in the method of removing the residue, the solidified residue remaining at the bottom of the furnace is pulled out of the furnace as a divided residue block and removed.
Remove the iron skin of the part that pulls out the divided residue block,
Drill a bottom bottom through-hole to insert a wire saw into the bottom refractory bottom
Insert a wire saw into the bottom bottom through-hole, wind this wire saw around the outer periphery of the residue,
Run the wire saw and cut the residue and furnace bottom refractory vertically to divide it into multiple residue blocks,
A method for removing a residue, wherein the residue block is pulled out of the furnace. 残銑ブロックの引き出し方向に平行の分割線、または引き出し方向に末広がりの分割線に沿って残銑と炉底耐火物を垂直方向に切断して複数のブロックに分割することを特徴とする請求項１記載の残銑の撤去方法。   The residue and the bottom refractory are cut in a vertical direction and divided into a plurality of blocks along a dividing line parallel to the drawing direction of the residue block or a dividing line extending in the drawing direction. 1. A method for removing residues as described in 1. 任意の複数の分割線を複数のワイヤーソーで並行して切断することを特徴とする請求項２記載の残銑の撤去方法。   3. The method for removing a residue according to claim 2, wherein any plurality of dividing lines are cut in parallel with a plurality of wire saws. ワイヤーソーを挿通する残銑下貫通孔を残銑ブロックの引き出し方向と直交する方向に穿孔し、
残銑ブロックの引き出し方向と直交する方向の分割線に沿って残銑と炉底耐火物を垂直方向に切断して二つの残銑ブロックに分割することを特徴とする請求項１記載の残銑の撤去方法。 Perforate bottom through-holes through which wire saws are inserted are drilled in a direction perpendicular to the pull-out direction of the residue block,
2. The residue according to claim 1, wherein the residue and the furnace bottom refractory are cut in a vertical direction along a dividing line in a direction perpendicular to the direction in which the residue block is drawn, and divided into two residue blocks. Removal method. 残銑を切断する際に、ワイヤーソーが走行する経路に冷却流体を連続的に供給してワイヤーソーを冷却しながら切断することを特徴とする請求項１〜４のいずれかに記載の残銑の撤去方法。   The residue according to any one of claims 1 to 4, wherein when cutting the residue, the cooling fluid is continuously supplied to a path along which the wire saw travels to cut the wire saw while cooling the wire saw. Removal method. 残銑ブロックを炉外へ引き出すに際し、引き出す残銑ブロックの底面と同じレベルに残銑ブロックの搬出用台車又は残銑ブロックの搬出用架台の上面レベルを合わせて残銑ブロックの横に設置し、
残銑ブロックに水平力を与えて残銑ブロックと残留する炉底耐火物間に滑りを生じさせて残銑ブロックを水平方向に横移動させて引き出して残銑ブロックの搬出用台車又は残銑ブロックの搬出用架台上に積載することを特徴とする請求項１〜５のいずれかに記載の残銑の撤去方法。 When pulling out the residue block outside the furnace, install it next to the residue block by aligning the top level of the carriage for removing the residue block or the carriage for removing the residue block with the same level as the bottom surface of the residue block to be drawn out,
A horizontal force is applied to the residue block to cause slippage between the residue block and the remaining furnace bottom refractory, and the residue block is moved horizontally in the horizontal direction and pulled out to draw out the residue block or residue block. The residue removal method according to any one of claims 1 to 5, wherein the residue is loaded on a carry-out stand. 残銑ブロックを炉外へ引き出すに際し、
残銑ブロックをジャッキアップし、
残銑ブロックと残留する炉底耐火物の間に形成された空間に残銑ブロックを積載する移動装置を残銑ブロックの下部に配置し、
残銑ブロックをジャッキダウンして移動装置上に積載し、
残銑ブロックを積載した移動装置を水平移動させて残銑ブロックを炉外へ引き出すことを特徴とする請求項１〜５のいずれかに記載の残銑の撤去方法。 When pulling out the residue block outside the furnace,
Jack up the remaining block,
A moving device for loading the residue block in a space formed between the residue block and the remaining furnace bottom refractory is disposed at the bottom of the residue block,
Jack down the remaining block and load it on the moving device.
The method for removing a residue according to any one of claims 1 to 5, wherein the moving device loaded with the residue block is horizontally moved to draw the residue block out of the furnace.
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