JPH02403B2 - - Google Patents
Info
- Publication number
- JPH02403B2 JPH02403B2 JP20035482A JP20035482A JPH02403B2 JP H02403 B2 JPH02403 B2 JP H02403B2 JP 20035482 A JP20035482 A JP 20035482A JP 20035482 A JP20035482 A JP 20035482A JP H02403 B2 JPH02403 B2 JP H02403B2
- Authority
- JP
- Japan
- Prior art keywords
- tuyere
- refractory
- around
- furnace
- refractory wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 claims description 29
- 238000007670 refining Methods 0.000 claims description 21
- 239000011819 refractory material Substances 0.000 claims description 17
- 238000003466 welding Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 239000000446 fuel Substances 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- 238000007751 thermal spraying Methods 0.000 claims 1
- 238000010285 flame spraying Methods 0.000 description 19
- 230000008439 repair process Effects 0.000 description 16
- 239000010410 layer Substances 0.000 description 15
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- 238000007664 blowing Methods 0.000 description 6
- 239000011823 monolithic refractory Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000004449 solid propellant Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000011269 tar Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/48—Bottoms or tuyéres of converters
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
【発明の詳細な説明】
本発明は、精錬容器の溶損羽口取替え時の羽口
まわり耐火物壁の補修方法に関するもので、とく
に羽口まわり耐火物損耗部に予め不定形耐火材を
充填してからその上より粉粒状耐火材を火炎溶射
して溶着層を被成させ、該羽口まわり耐火物壁を
補修する方法について提案する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing a refractory wall around a tuyere when replacing a damaged tuyere of a refining vessel. We then propose a method for repairing the refractory wall around the tuyere by flame spraying a powdery refractory material over the refractory material to form a welded layer.
一般に、精錬容器は、金属溶湯や溶滓の影響に
よつて内張り耐火物の損耗が生じるが、その損耗
の程度は浴面下の耐火物壁中を貫通して配設した
精錬用または撹拌用の気体流路；いわゆる浸漬羽
口部でとくに著しく、この羽口近傍における損耗
の如何は精錬方法および炉寿命に重大な影響を与
える。例えば底吹き転炉やAOD炉の羽口部損耗
の程度が大きくなつた場合には漏鋼事故に到る危
険すらある。 In general, the refractory lining of a refining vessel suffers wear due to the effects of molten metal and slag, but the degree of wear and tear depends on the refractory lining installed below the bath surface. This is especially noticeable in the so-called immersed tuyeres, and wear and tear in the vicinity of the tuyeres has a significant impact on the refining method and the life of the furnace. For example, if the degree of wear on the tuyere of a bottom-blowing converter or AOD furnace increases, there is even a risk of steel leakage.
こうした実情に鑑み従来より損耗した羽口の補
修技術が各種開発されており、例えばその損耗羽
口を単にプラギングしたり、あるいは一旦炉を冷
却して羽口および羽口まわりの耐火物ライニング
（耐火物壁）全体を抜き去り新らたな羽口と耐火
物壁を形成する方法、羽口だけを抜差ししそのま
わりの耐火物壁損耗部は不定形の耐火材で充填補
修する方法、あるいは炉底全体もしくは炉全体の
耐火物を交換する方法などが行われている。かか
る従来技術の場合、まず羽口をプラギングする技
術にあつては、精錬に必要なガス流量の確保が難
しくなるため、以後の精錬に悪影響を及ぼす欠点
がある。また、羽口および羽口まわりの耐火物層
を同時に抜差しして補修する技術の場合、炉体を
常温まで一旦冷却し、補修後に再昇熱しなければ
ならず、補修１回当りに要する作業時間が長く、
エネルギーロスが大きいという欠点がある。これ
に対し羽口だけを抜取り、その羽口まわり耐火物
壁のうち損耗した部分のみを不定形耐火物で補修
する技術の場合簡便で炉底損耗部を効率的に補修
できる点で上述の技術に較べて有効である。この
方法は、炉の下方より羽口外周面と残存する耐火
物層との隙間に適度の流動性を有する耐火材を圧
入する方法として知られている。ただ、この流動
性耐火材の圧入による方法では、圧入する耐火材
に適度の流動性を与える必要から、水、タール、
あるいは重油等の流動性付与のための媒溶剤を多
量に配合することが不可決であり、圧入時耐火材
の粒度偏析の問題が生ずるのが無視できない欠点
として指摘されていた。従つて、粗粒の配合がで
きず、このため、圧入後の耐火材の耐浸蝕性（強
度）が十分でなく、羽口のみの抜差し補修による
メリツトは希薄なものとなつていた。 In view of these circumstances, various repair techniques for worn tuyeres have been developed, such as simply plugging the worn tuyeres, or cooling the furnace once and replacing the tuyere and the refractory lining around the tuyere. There are two methods: removing the entire tuyere and forming a new refractory wall, removing only the tuyere and filling and repairing the damaged part of the refractory wall around it with amorphous refractory material, or Methods such as replacing the refractories of the entire bottom or the entire furnace are being used. In the case of such conventional techniques, first, in the technique of plugging the tuyeres, it becomes difficult to secure the gas flow rate necessary for refining, so there is a drawback that it adversely affects subsequent refining. In addition, in the case of a repair technique in which the tuyere and the refractory layer around the tuyere are simultaneously inserted and removed, the furnace body must be cooled to room temperature and then heated again after repair, which increases the work time required for each repair. is long,
The disadvantage is that energy loss is large. On the other hand, the above-mentioned technique is simple and allows for efficient repair of the worn part of the hearth bottom if only the tuyere is removed and only the worn part of the refractory wall around the tuyere is repaired with monolithic refractories. It is more effective than This method is known as a method in which a refractory material having appropriate fluidity is press-fitted into the gap between the outer circumferential surface of the tuyere and the remaining refractory layer from below the furnace. However, in this method of press-fitting fluid refractories, water, tar,
Alternatively, it is not acceptable to incorporate a large amount of a solvent such as heavy oil to impart fluidity, and the problem of particle size segregation of the refractory material during press-fitting has been pointed out as a non-negligible drawback. Therefore, it is not possible to mix coarse particles, and as a result, the corrosion resistance (strength) of the refractory material after press-fitting is insufficient, and the merits of repairing only the tuyeres by inserting and removing them are limited.
その他、炉底部全体を交換する技術の場合、前
述した羽口および羽口まわり耐火物を同時に抜差
しする場合のデメリツトに加えて、炉底外周部に
残存する使用可能な耐火物までも廃棄しなければ
ならないという欠点があつた。 In addition to the above-mentioned disadvantages of simultaneously inserting and removing the tuyeres and refractories around the tuyeres, in the case of the technique of replacing the entire furnace bottom, it is also necessary to discard the usable refractories remaining around the outer periphery of the furnace bottom. There was a drawback that it did not work.
本発明は、上述した従来行つてきた損耗羽口取
替え時の羽口まわり耐火物補修技術の欠点を克服
を目的として開発した方法であり、その要旨とす
る構成は、
溶鉄を収容する精錬容器の耐火物壁を貫通して
配設したガス吹込み羽口の取替えに当り、交換羽
口まわりに生ずる羽口まわり耐火物壁損耗部を補
修する方法において、上記交換羽口のセツトにつ
づき、まず羽口まわり損耗部空間内に不定形耐火
材を充填し、その充填層表面に対し、粉粒状耐火
材を粉粒状固体燃料とともに支燃性ガス介在のも
とで溶射し溶着させることにより、溶着層を被成
して補修耐火物壁とすることを特徴とする精錬容
器の溶損羽口取替え時の羽口まわり耐火物壁の補
修方法であり、
このように要旨構成される補修法によつて、本
発明は、
補修によるエネルギーロスの減少を図り、そし
て、精錬プロセスに悪影響を与えることなく炉底
寿命の大幅な延長を実現し、かつ製鋼工程におけ
る精錬容器の稼動率の向上を可能ならしめるもの
である。 The present invention is a method developed with the aim of overcoming the drawbacks of the conventional technique for repairing refractories around tuyeres when replacing worn tuyeres, as described above, and the gist of the invention is to: In the method of repairing the damaged part of the refractory wall around the tuyere that occurs around the replacement tuyere when replacing a gas blowing tuyere installed through the refractory wall, first, following the installation of the replacement tuyere, Welding is achieved by filling the space around the tuyere with a monolithic refractory material, and by thermally spraying and welding the powdery refractory material together with powdery solid fuel in the presence of a combustion-supporting gas, onto the surface of the filled layer. This is a method for repairing the refractory wall around the tuyere when replacing the eroded tuyere of a refining vessel, which is characterized by forming a repaired refractory wall by forming a layer of refractory material. Therefore, the present invention aims to reduce energy loss due to repairs, significantly extend the life of the furnace bottom without adversely affecting the refining process, and improve the operating rate of the refining vessel in the steelmaking process. It is something to tighten.
以下に本発明の構成の詳細を説明する。 The details of the configuration of the present invention will be explained below.
第１図は、本発明の好適実施例を示すものであ
り、図中の１は精錬炉の炉底部、２は羽口、３は
羽口まわりに残存する耐火物壁、４は火炎溶射ノ
ズル、５は不定形耐火物充填部、６は火炎溶射に
よる耐火材溶着層である。本発明の補修方法は、
まず精錬炉１から出鋼、排滓後に溶損した羽口を
抜き取り、抜き取り後の空間に交換する新らたな
羽口を挿し込む。その新らたな羽口２まわりに生
じた間隙ならびに羽口上端と残存耐火物壁との間
に生ずる凹部：いわゆる羽口まわり損耗部に、炉
外より不定形耐火材を主として半乾式の吹付け、
投射あるいは圧入法などにより充填し固化させ
る。 FIG. 1 shows a preferred embodiment of the present invention, in which 1 is the bottom of a refining furnace, 2 is a tuyere, 3 is a refractory wall remaining around the tuyere, and 4 is a flame spray nozzle. , 5 is an amorphous refractory filled part, and 6 is a refractory welded layer formed by flame spraying. The repair method of the present invention includes:
First, after tapping and slag removal from the refining furnace 1, the melted tuyere is extracted, and a new tuyere to be replaced is inserted into the space after extraction. The gap created around the new tuyere 2 and the recess created between the upper end of the tuyere and the remaining refractory wall: the so-called worn area around the tuyere is filled with semi-dry blasting of monolithic refractory material from outside the furnace. Attached,
It is filled and solidified using a method such as projection or press-fitting.
その充填を終えた損耗部の表面に対し、今度は
火炎溶射ノズル４より粉粒状耐火材を火炎溶射
し、溶着層６を被成して補修する。 The surface of the worn part that has been filled is now flame-sprayed with powdery refractory material from the flame-spraying nozzle 4 to form a welded layer 6 and repaired.
ここに火炎溶射法とは、粉粒状耐火物とコーク
スなどの固体燃料とを、酸素などの支燃性ガスと
ともに噴射し、このときコークスとガスとの間の
反応で得られる高温火炎によつて、該粉粒状耐火
物を溶融金属精錬容器などの内張り耐火物壁の損
耗部に溶融もしくは半溶融状態にして吹付け、表
面層に強固な溶着層を形成させる方法である。 The flame spraying method involves injecting a powdered refractory and a solid fuel such as coke together with a combustion-supporting gas such as oxygen. This is a method in which the granular refractory is sprayed in a molten or semi-molten state onto the worn parts of the refractory lining wall of a molten metal refining vessel or the like to form a strong welded layer on the surface layer.
この火炎溶射に当つては精錬炉内壁温度が火炎
溶射を行うに十分な温度になつていなければなら
ないが、その温度に達していないときには、火炎
溶射を行う前に予め火炎溶射する部分の昇熱を図
るか、あるいは羽口抜差し補修を行つた部位が再
度損耗しない程度の精錬を１ヒート実施するなど
の方法で火炎溶射を行うに必要な炉内壁温度を確
保する予熱を施すことが好ましい。もちろん、羽
口の抜差し補修を行つた時点で、火炎溶射を行う
に十分な炉内温度が確保されている場合には、上
述した炉内予熱は不要である。 For this flame spraying, the temperature of the inner wall of the refining furnace must be high enough to carry out flame spraying, but if this temperature has not been reached, the temperature of the part to be flame sprayed must be increased before flame spraying is carried out. It is preferable to perform preheating to ensure the inner wall temperature of the furnace necessary for flame spraying by a method such as carrying out one heat of refining to the extent that the part where the tuyere has been inserted and removed is not worn out again. Of course, if the temperature inside the furnace is sufficient to carry out flame spraying at the time when the tuyere is inserted and removed, the above-mentioned preheating inside the furnace is not necessary.
なお、交換羽口セツト後の不定形耐火物充填後
は、望ましくは直ちに上記火炎溶射を施すのがよ
い。 It is preferable to perform the above-mentioned flame spraying immediately after filling the monolithic refractory after setting the replacement tuyeres.
なお、火炎溶射を行うに当り、火炎溶射の高温
雰囲気になる羽口の溶融と、溶射する粉末耐火物
の羽口内への侵入を防止するために、該羽口２は
マスキングしておくか、羽口保護用の冷却ガスを
流すことが必要である。また、火炎溶射による羽
口まわりの充填耐火物層表面に良好な溶着層を形
成するためには、火炎溶射用ノズル４の中心軸線
方向を、羽口保護用冷却ガスの噴射流による影響
が避けられるよう第１図に示した向き（羽口に対
し斜めを指向する向き）にするのが良い。 In addition, when performing flame spraying, in order to prevent the tuyere from melting in the high-temperature atmosphere of flame spraying and to prevent the powder refractory to be sprayed from entering the tuyere, the tuyere 2 should be masked or It is necessary to flow cooling gas to protect the tuyeres. In addition, in order to form a good welded layer on the surface of the filled refractory layer around the tuyere by flame spraying, it is necessary to avoid the influence of the jet flow of the cooling gas for protecting the tuyere in the central axis direction of the flame spray nozzle 4. It is best to orient it as shown in Figure 1 (direction diagonal to the tuyere) so that the
上述の説明は主として底吹き転炉の場合で説明
したが、他の転炉や単に撹拌を目的とする羽口を
具えるAOD炉の羽口など同種の精錬容器用羽口
補修時の場合に適用できる。 The above explanation was mainly given in the case of a bottom-blowing converter, but it can also be applied when repairing tuyere for similar types of refining vessels, such as the tuyeres of other converters or AOD furnaces that are equipped with tuyeres for simple stirring purposes. Applicable.
また、上述した例は羽口のみを抜き取りその後
そのまわりの耐火物壁を補修する場合で説明した
が羽口を取りまく耐火物層全体を抜き出し、新ら
たに築造する場合にも本発明法はそのまま適用で
きる。 In addition, although the above example was explained in the case where only the tuyere was extracted and the surrounding refractory wall was repaired, the method of the present invention can also be applied when the entire refractory layer surrounding the tuyere is extracted and a new building is constructed. It can be applied as is.
実施例 １
精錬を終え出鋼、排滓した底吹き転炉から、そ
の炉底にある損耗した羽口を抜き取り、代りに新
らたな交換羽口を挿し込み、そのまわりに生じて
いる間隙および羽口まわり損耗部を半乾式吹付け
法により、不定形耐火材を充填して補修した。Example 1 The worn out tuyeres at the bottom of the bottom-blowing converter were removed from a bottom-blowing converter that had been smelted, tapped, and sludged, and new replacement tuyeres were inserted in their place to fill the gap around them. The damaged areas around the tuyeres were repaired by filling them with monolithic refractory material using a semi-dry spraying method.
その後、炉内の温度を火炎溶射するのに必要な
温度にするために、上記転炉で低温出鋼材を溶製
する精錬を行い、出鋼、排滓の後、MgO：90重
量％を含む他にCaO、SiO2、Al2O3、Fe2O3のマ
グネサイト粉末（粒度100μｍ以下：97重量％、
中心粒度40〜60μｍ）とコークス粉とを、３：１
の割合で配合した混合物を、酸素気流中で上記の
羽口まわりに溶射して溶着層を形成させる火炎溶
射を行つた。 After that, in order to bring the temperature inside the furnace to the temperature required for flame spraying, the low-temperature tapped steel is melted and refined in the above converter, and after tapping and slag, it contains 90% by weight of MgO. In addition, magnesite powder of CaO, SiO 2 , Al 2 O 3 , Fe 2 O 3 (particle size 100 μm or less: 97% by weight,
(center particle size: 40 to 60 μm) and coke powder at a ratio of 3:1.
Flame spraying was carried out by spraying a mixture blended in the proportions of 1 to 2 in an oxygen stream around the tuyere to form a welded layer.
上述の第１段階の半乾式吹付け補修法で用いた
材料は、MgO：95重量％他にCaO、SiO2、
Al2O3、Fe2O3などの組成である海水マグネシア
クリンカーの粒度３mm以下と、バインダーに珪酸
ナトリウム水を配合した構成のものを半乾式吹付
け補修機により吹付けた。 The materials used in the first stage semi-dry spray repair method described above were MgO: 95% by weight, as well as CaO, SiO 2 ,
Seawater magnesia clinker having a particle size of 3 mm or less and having a composition such as Al 2 O 3 and Fe 2 O 3 and a binder containing sodium silicate water were sprayed using a semi-dry spray repair machine.
次に、火炎溶射を行うに必要な炉内壁温度を確
保するために行つた低温出鋼材は、出鋼温度；
1600℃の普通鋼を精錬した。 Next, in order to ensure the furnace inner wall temperature necessary for flame spraying, the low temperature tapping temperature is
Refined ordinary steel at 1600℃.
また、火炎溶射吹付け条件は、混合物の吐出
量；200Kg／min、酸素ガス量：80Nm3／minで行
い、火炎溶射による吹付け補修に要した時間は、
５分間であり、その補修後は直ちに次の精錬を行
うことができた。 The flame spraying conditions were a mixture discharge rate of 200 kg/min and an oxygen gas rate of 80 Nm 3 /min, and the time required for flame spraying repair was as follows:
It took 5 minutes, and the next refining could be carried out immediately after the repair.
実施例 ２
７本の羽口を有する85トン底吹き転炉（平均出
鋼温度：1680℃）の損耗の最も激しい個所を、炉
底部を交換するまでの間、実施例１で示した補修
を２回実施した。その結果、単なる不定形耐火物
の吹付け乾燥という補修を施した従来法の場合、
炉寿命が150ヒートであつたのに対し、本発明補
修法によれば炉寿命を240ヒートまで向上させる
ことができた。Example 2 The most worn parts of an 85-ton bottom blowing converter (average tapping temperature: 1680°C) with seven tuyeres were repaired as shown in Example 1 until the furnace bottom was replaced. It was carried out twice. As a result, in the case of the conventional repair method, which was simply spray drying of monolithic refractories,
While the furnace life was 150 heats, the repair method of the present invention was able to extend the furnace life to 240 heats.
また、比較例として、本発明の第１段階を示す
半乾式吹付け補修機による補修では、炉寿命が
170ヒートで終つた。 In addition, as a comparative example, in repair using a semi-dry spray repair machine, which represents the first stage of the present invention, the furnace life
Finished with a 170 heat.
以上述べたようにこの発明によれば、転炉や
AODなどの羽口部に生じた耐火物壁の損耗を周
囲の残存耐火物壁レベルまで、製鋼工程における
精錬容器の稼動率を低下することなく、また周囲
残存耐火物と同等質の吹付け補修層で修復を行う
ことができる。従つて、製鋼工程における精錬容
器の稼動率の大幅な向上と、炉底外周部耐火物ラ
イニングの廃棄量減少による耐火物の原単位およ
び原単位の向上が実現できる。 As described above, according to this invention, the converter
The damage to the refractory wall that occurs at the tuyeres of AOD, etc. can be repaired by spraying to the level of the surrounding remaining refractory wall without reducing the operation rate of the refining vessel in the steelmaking process, and with the same quality as the surrounding remaining refractory wall. Repairs can be made in layers. Therefore, it is possible to significantly improve the operating rate of the refining vessel in the steelmaking process and to improve the basic unit and basic unit of refractories by reducing the amount of waste of the refractory lining at the outer periphery of the hearth bottom.
第１図は、本発明法の実施により補修した精錬
炉の炉底羽口部まわりの断面図である。
１……精錬炉、２……羽口、３……残存耐火物
壁、４……火炎溶射用ノズル、５……不定形耐火
物充填層、６……溶着層。
FIG. 1 is a sectional view around the bottom tuyere of a refining furnace repaired by implementing the method of the present invention. DESCRIPTION OF SYMBOLS 1... Refining furnace, 2... Tuyere, 3... Residual refractory wall, 4... Nozzle for flame spraying, 5... Unshaped refractory packed layer, 6... Welding layer.
Claims (1)
て配設したガス吹込み羽口の取替えに当り、交換
羽口まわりに生ずる羽口まわり耐火物壁損耗部を
補修する方法において、 上記交換羽口のセツトにつづき、まず羽口まわ
り損耗部空間内に不定形耐火材を充填し、その充
填層表面に対し、粉粒状耐火材を燃料とともに支
燃性ガス介在のもとで溶射し溶着させることによ
り、溶着層を被成して補修耐火物壁とすることを
特徴とする精錬容器の溶損羽口取替え時の羽口ま
わり耐火物壁の補修方法。[Scope of Claims] 1. Repairing the damaged part of the refractory wall around the tuyere that occurs around the replacement tuyere when replacing the gas injection tuyere that is installed through the refractory wall of a refining vessel that stores molten iron. In this method, following the setting of the replacement tuyere, first, the space around the tuyere in the worn area is filled with amorphous refractory material, and the powdery refractory material is applied to the surface of the filled layer along with fuel in the presence of a combustion-supporting gas. A method for repairing a refractory wall around a tuyere when replacing a damaged tuyere of a refining vessel, characterized by forming a welded layer on the refractory wall by thermal spraying and welding the refractory wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20035482A JPS5993818A (en) | 1982-11-17 | 1982-11-17 | Method for repairing refractory wall around burnt-out tuyere of refining vessel during change of tuyere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20035482A JPS5993818A (en) | 1982-11-17 | 1982-11-17 | Method for repairing refractory wall around burnt-out tuyere of refining vessel during change of tuyere |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5993818A JPS5993818A (en) | 1984-05-30 |
| JPH02403B2 true JPH02403B2 (en) | 1990-01-08 |
Family
ID=16422897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20035482A Granted JPS5993818A (en) | 1982-11-17 | 1982-11-17 | Method for repairing refractory wall around burnt-out tuyere of refining vessel during change of tuyere |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5993818A (en) |
-
1982
- 1982-11-17 JP JP20035482A patent/JPS5993818A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5993818A (en) | 1984-05-30 |
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