JP2010174317A

JP2010174317A - Cooling structure of furnace body of blast furnace

Info

Publication number: JP2010174317A
Application number: JP2009017166A
Authority: JP
Inventors: Takashi Otomo; 隆史大友; Takahiro Kumeta; 隆弘久米田; Shigeyuki Hirose; 茂行廣瀬; Kiyoshi Ogata; 清志緒方; Hiroshi Takeu; 博竹生
Original assignee: JFE Steel Corp
Current assignee: JFE Steel Corp
Priority date: 2009-01-28
Filing date: 2009-01-28
Publication date: 2010-08-12
Anticipated expiration: 2029-01-28
Also published as: JP5369716B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling structure of a furnace body of a blast furnace, which is built at a low cost, and in which the wear of a cooling pipe is reduced and the cooling pipe can be easily repaired even if having been worn. <P>SOLUTION: This cooling structure includes: an inner refractory layer 1 formed of firebrick and the like, in the blast furnace; an iron shell 2 which covers the inner refractory layer 1; a cooling pipe 3 which is arranged outside the iron shell 2; and an outer refractory layer 4 which is arranged so as to cover the iron shell 2 and contain the cooling pipe 3 therein; and a casing layer 5 which is formed of a thin iron plate and the like, and covers the outside of the outer refractory layer 4. The iron shell 2 having a high thermal conductivity and a high heat transfer coefficient can be cooled with high cooling efficiency even though having been cooled by the cooling pipe 3 from the outside. In addition, even if the inner refractory layer 1 is worn out, the cooling pipe 3 is not exposed to a high-temperature substance in the furnace. In addition, even if the cooling pipe 3 is worn out, it is not necessary to detach the iron shell 2, and the repair is easy. The construction cost is also low because it is not necessary to supply the coolant through the iron shell 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、高炉の炉体を冷却するための高炉炉体冷却構造に関するものである。 The present invention relates to a blast furnace furnace cooling structure for cooling a furnace body of a blast furnace.

高炉の炉体は、特に炉底部が高温に晒されるため、炉体を構成する耐火レンガなどの耐火物が損耗しやすい。そこで、炉体には、一般にステーブクーラと呼ばれる冷却配管を炉体内部に配設して炉体を冷却する。下記特許文献１では、羽口より上側と下側とでステーブクーラの材質を変更し、冷却効率に優れる一方、高価な銅製ステーブクーラの使用量を低減している。 Since the furnace bottom of the blast furnace is particularly exposed to the high temperature, the refractory material such as refractory bricks constituting the furnace body is easily worn out. Therefore, a cooling pipe generally called a stave cooler is provided in the furnace body to cool the furnace body. In Patent Document 1, while to change the material of the stave cooler in the upper and the lower side of the tuyeres, excellent cooling efficiency, thereby reducing the amount of expensive copper stave coolers.

特開２００８−１０１２３３号公報JP 2008-101233 A

しかしながら、前記特許文献１に記載される高炉炉体冷却構造に代表されるように、従来の高炉炉体冷却構造は、冷却配管が鉄皮の内側に配設されているため、建設そのものが複雑でコスト高であるばかりでなく、例えば炉壁を構成する耐火レンガなどの耐火物が熱によって損耗すると、冷却配管が高温に晒され、損耗して冷却液が漏れてしまう。そして、従来の高炉炉体冷却構造では、このように冷却配管が損耗しても、強度材である鉄皮を外すことができない関係から、冷却配管そのものを交換することが困難であるという問題が存在している。
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、建築コストが安く、冷却配管の損耗を抑制し、仮に冷却配管が損耗しても補修しやすい高炉炉体冷却構造を提供することを目的とするものである。 However, as typified by the blast furnace furnace cooling structure described in Patent Document 1, the conventional blast furnace furnace cooling structure has a complicated construction because the cooling pipe is disposed inside the iron skin. In addition to the high cost, for example, when a refractory material such as a refractory brick constituting the furnace wall is worn out by heat, the cooling pipe is exposed to a high temperature, and is worn out and the coolant leaks. And in the conventional blast furnace furnace cooling structure, even if the cooling pipe is worn out, the problem is that it is difficult to replace the cooling pipe itself because the strength material iron skin cannot be removed. Existing.
The present invention has been made by paying attention to the above-mentioned problems, and has a blast furnace furnace cooling structure that is low in construction cost, suppresses cooling pipe wear, and is easy to repair even if the cooling pipe wears out. It is intended to provide.

上記課題を解決するために、本発明の高炉炉体冷却構造は、高炉の炉内を覆う内側耐火物層と、前記内側耐火物層の外側を覆う鉄皮と、前記鉄皮の外側に配設された冷却配管と、前記鉄皮の外側を覆い且つ前記冷却配管を内包する外側耐火物層と、前記外側耐火物層を覆うケーシング層とを備えたことを特徴とするものである。
また、前記外側耐火物層の熱伝導率が、内側耐火物層の熱伝導率よりも高いことを特徴とするものである。 In order to solve the above problems, a blast furnace furnace cooling structure according to the present invention includes an inner refractory layer covering the inside of the blast furnace, an iron skin covering the outer side of the inner refractory layer, and an outer side of the iron skin. A cooling pipe provided, an outer refractory layer that covers the outer side of the iron skin and encloses the cooling pipe, and a casing layer that covers the outer refractory layer are provided.
In addition, the thermal conductivity of the outer refractory layer is higher than the thermal conductivity of the inner refractory layer.

而して、本発明の高炉炉体冷却構造によれば、冷却配管は鉄皮の外側にあるので、建設が容易でコストも安く、冷却配管が損耗しにくく、仮に冷却配管が損耗しても鉄皮を外す必要のないことから補修しやすい。
また、外側耐火物層の熱伝導率を内側耐火物層の熱伝導率より高くすることで、冷却配管による冷却効率を確保することができる。即ち、外側耐火層は、熱伝導率が高い材質とすることで、冷却配管による冷却効率を確保することができる。 Thus, according to the blast furnace body cooling structure of the present invention, since the cooling pipe is outside the iron shell, the construction is easy and the cost is low, the cooling pipe is not easily worn, and even if the cooling pipe is worn. It is easy to repair because there is no need to remove the iron skin.
Moreover, the cooling efficiency by cooling piping is securable by making the heat conductivity of an outer side refractory layer higher than the heat conductivity of an inner side refractory layer. That is, the outer refractory layer is made of a material having a high thermal conductivity, so that the cooling efficiency by the cooling pipe can be ensured.

本発明の高炉炉体冷却構造が適用された高炉の一実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows one Embodiment of the blast furnace to which the blast furnace body cooling structure of this invention was applied. 図１の高炉炉体に設けられた冷却構造の断面図であり、（ａ）は横断面図、（ｂ）は縦断面図である。It is sectional drawing of the cooling structure provided in the blast furnace furnace body of FIG. 1, (a) is a cross-sectional view, (b) is a longitudinal cross-sectional view.

次に、本発明の高炉炉体冷却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１は、本実施形態の高炉炉体冷却構造が施された高炉の全体図である。本実施形態の高炉炉体冷却構造は、羽口よりも上方のＡ部、羽口近傍のＢ部、出銑口近傍の炉底Ｃ部を含む如何なる箇所にも適用可能である。また、特に損耗の激しい炉底Ｃ部のみ、とかＣ部とＢ部に適用など、種々の形態で適用することができる。 Next, an embodiment of the blast furnace furnace cooling structure of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view of a blast furnace provided with the blast furnace body cooling structure of the present embodiment. The blast furnace furnace cooling structure of the present embodiment can be applied to any location including the A part above the tuyere, the B part near the tuyere, and the furnace bottom C part near the tap. In addition, the present invention can be applied in various forms such as only the bottom C portion where the wear is particularly severe, or applied to the C portion and the B portion.

図２は、図１の高炉炉体冷却構造の断面図であり、何れも図の右方が炉外、左方が炉内である。図中の符号１は、炉内を覆う内側耐火物層であり、既存の高炉と同様に、耐火レンガなどで構成される。図中の符号２は、内側耐火物層１を覆う鉄皮である。この鉄皮２は、従来の鉄皮と同様に、高炉の強度材であり、高炉の強度を担うものである。図中の符号３は、鉄皮２の外側に配設された冷却配管であり、本実施形態では上下方向に長手にして、鉄皮２、即ち高炉の円周方向に沿って複数の管路を配設した。勿論、管路の内部には冷却液を供給して鉄皮２越しに内側耐火物層１を冷却する。従来、鉄皮を介して冷却するのは冷却効率が悪いと考えられていたが、鉄皮は熱伝導率も熱伝達率も高い鉄製であるから、鉄皮の外側から冷却しても冷却効率は高い。 2 is a cross-sectional view of the blast furnace furnace cooling structure of FIG. 1, and in each case, the right side of the figure is outside the furnace and the left side is inside the furnace. The code | symbol 1 in a figure is an inner refractory layer which covers the inside of a furnace, and is comprised with a refractory brick etc. similarly to the existing blast furnace. Reference numeral 2 in the figure is an iron skin covering the inner refractory layer 1. This iron skin 2 is a strength material of a blast furnace like the conventional iron skin, and bears the strength of the blast furnace. Reference numeral 3 in the figure is a cooling pipe disposed outside the iron skin 2, and in this embodiment, a plurality of pipe lines are provided along the circumferential direction of the iron skin 2, that is, the blast furnace, in the longitudinal direction. Arranged. Of course, a coolant is supplied to the inside of the pipe line to cool the inner refractory layer 1 through the iron skin 2. Conventionally, cooling through the iron skin was thought to be poor in cooling efficiency, but the iron skin is made of iron with high thermal conductivity and heat transfer rate, so even if it is cooled from the outside of the iron skin, the cooling efficiency Is expensive.

図中の符号４は、鉄皮２を覆い且つ冷却配管３を内包する外側耐火物層である。この外側耐火物層４は、例えばカーボン系の不定形材のように、内側耐火物層１を構成する耐火レンガなどよりも熱伝導率の高いものを用いる。図中の符号５は、前記外側耐火物層４を覆うケーシング層である。このケーシング層５は、例えば薄鉄板などで構成され、外側耐火物層４を保持する。 Reference numeral 4 in the figure denotes an outer refractory layer that covers the iron skin 2 and encloses the cooling pipe 3. The outer refractory layer 4 is made of a material having a higher thermal conductivity than the refractory bricks constituting the inner refractory layer 1 such as a carbon-based amorphous material. Reference numeral 5 in the figure is a casing layer that covers the outer refractory layer 4. The casing layer 5 is made of, for example, a thin iron plate and holds the outer refractory layer 4.

このような構成を有する本実施形態の高炉炉体冷却構造では、前述したように、冷却配管３によって鉄皮２の外側から冷却するが、鉄皮２は熱伝導率も熱伝達率も高く、外側耐火物層４も熱伝導率の高いため、内側耐火物層１の冷却効率は高い。例えば、前記特許文献１に見られるように、鉄皮の内側に冷却配管を配設する場合であっても、内側耐火物が損耗したときに、冷却配管が炉内高温物質に晒されないように、冷却配管を鉄皮のすぐ内側に配設するのが通例であり、本実施形態の冷却配管による冷却効率と大差ない。また、冷却配管３は、鉄皮２の外側にあるため、仮に内側耐火物層１が損耗しても、冷却配管３が炉内の高温物質に直接晒されることはなく、その分だけ、冷却配管３の損耗を抑制することができ、鉄皮内側冷却配管からの冷却液漏れに伴う腐食も回避でき、冷却能力維持も可能となる。また、冷却配管３の高温物質に晒される損耗は少なくても、熱収縮による亀裂や腐食といった損耗は考えられる。本実施形態では、冷却配管３が鉄皮２の外側にあるため、冷却配管３が損耗したときの補修も容易である。例えば、損耗或いは損傷部分が生じたときは、ケーシング層５である薄鉄板を切断し、冷却配管３などを補修し、外側耐火物層４を形成するカーボン系の耐火物を圧入或いは流し込み又はスタンプすることにより充填して元通りケーシング層５を形成することで補修することができ、内部には鉄皮２が存在するため、補修の間も、高炉操業に影響がない。 In the blast furnace furnace cooling structure of the present embodiment having such a configuration, as described above, cooling is performed from the outside of the iron shell 2 by the cooling pipe 3, but the iron shell 2 has high heat conductivity and heat transfer rate, Since the outer refractory layer 4 also has a high thermal conductivity, the cooling efficiency of the inner refractory layer 1 is high. For example, as seen in Patent Document 1, even when the cooling pipe is disposed inside the iron shell, when the inner refractory is worn out, the cooling pipe is not exposed to the high temperature substance in the furnace. In general, the cooling pipe is disposed just inside the iron skin, which is not much different from the cooling efficiency of the cooling pipe of this embodiment. Moreover, since the cooling pipe 3 is outside the iron shell 2, even if the inner refractory layer 1 is worn out, the cooling pipe 3 is not directly exposed to the high-temperature substance in the furnace, and the cooling pipe 3 is cooled by that amount. The wear of the pipe 3 can be suppressed, corrosion due to coolant leakage from the iron shell inner cooling pipe can be avoided, and the cooling capacity can be maintained. Further, even if the wear of the cooling pipe 3 exposed to the high-temperature substance is small, wear such as cracks and corrosion due to heat shrinkage can be considered. In this embodiment, since the cooling pipe 3 is outside the iron skin 2, repair when the cooling pipe 3 is worn is easy. For example, when wear or damage occurs, the thin steel plate as the casing layer 5 is cut, the cooling pipe 3 and the like are repaired, and the carbon-based refractory forming the outer refractory layer 4 is press-fitted or poured or stamped. By doing so, it can be repaired by forming the casing layer 5 as it is, and since the iron skin 2 exists inside, there is no influence on the blast furnace operation during the repair.

また、鉄皮２の外側に冷却配管３を配設する本実施形態の高炉炉体冷却構造は、そもそもの建設コストが安い。例えば、前記特許文献１に見られるように、鉄皮の内側に冷却配管を配設する場合、鉄皮を通して冷却配管に冷却液を供給する必要があり、そのやりとりの際に冷却液が漏れないように、鉄皮と冷却液供給管とを溶接するなどの必要があり、その分だけ、建設コストが高い。これに対し、鉄皮２の外側に冷却配管３を配設する本実施形態では、鉄皮越しの冷却液のやりとりが必要ないので、その分だけ、大幅に建設コストを低廉化することができる。 Moreover, the blast furnace furnace cooling structure of the present embodiment in which the cooling pipe 3 is disposed outside the iron shell 2 has a low construction cost in the first place. For example, as shown in the above-mentioned Patent Document 1, when the cooling pipe is disposed inside the iron shell, it is necessary to supply the cooling liquid to the cooling pipe through the iron shell, and the cooling liquid does not leak during the exchange. Thus, it is necessary to weld the iron shell and the coolant supply pipe, and the construction cost is high accordingly. On the other hand, in the present embodiment in which the cooling pipe 3 is disposed outside the iron skin 2, since it is not necessary to exchange the coolant through the iron skin, the construction cost can be greatly reduced by that amount. .

このように本実施形態の高炉炉体冷却構造では、冷却配管３は鉄皮２の外側にあるので、建設が容易でコストも安く、冷却配管３が損耗しにくく、仮に冷却配管３が損耗しても鉄皮２を外す必要のないことから補修しやすい。また、外側耐火物層４の熱伝導率を内側耐火物層１の熱伝導率より高くすることで、冷却配管３による冷却効率を確保することができる。 Thus, in the blast furnace furnace cooling structure of the present embodiment, since the cooling pipe 3 is outside the iron shell 2, the construction is easy and the cost is low, the cooling pipe 3 is not easily worn, and the cooling pipe 3 is temporarily worn. However, it is easy to repair because there is no need to remove the iron skin 2. Moreover, the cooling efficiency by the cooling piping 3 is securable by making the thermal conductivity of the outer side refractory layer 4 higher than the thermal conductivity of the inner side refractory layer 1.

１は内側耐火物層、２は鉄皮、３は冷却配管、４は外側耐火物層、５はケーシング層 1 is an inner refractory layer, 2 is an iron skin, 3 is a cooling pipe, 4 is an outer refractory layer, and 5 is a casing layer

Claims

An inner refractory layer covering the inside of the blast furnace, an iron skin covering the outside of the inner refractory layer, a cooling pipe disposed outside the iron skin, and covering the outer side of the iron skin and the cooling pipe A blast furnace furnace cooling structure, comprising: an outer refractory layer enclosing the outer refractory layer; and a casing layer covering the outer refractory layer.

The blast furnace furnace cooling structure according to claim 1, wherein the outer refractory layer has a thermal conductivity higher than that of the inner refractory layer.