JP3785724B2 - Coke oven hot repair material and coke oven wall repair method - Google Patents
Coke oven hot repair material and coke oven wall repair method Download PDFInfo
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- JP3785724B2 JP3785724B2 JP07193897A JP7193897A JP3785724B2 JP 3785724 B2 JP3785724 B2 JP 3785724B2 JP 07193897 A JP07193897 A JP 07193897A JP 7193897 A JP7193897 A JP 7193897A JP 3785724 B2 JP3785724 B2 JP 3785724B2
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5076—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with masses bonded by inorganic cements
- C04B41/5089—Silica sols, alkyl, ammonium or alkali metal silicate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00551—Refractory coatings, e.g. for tamping
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00577—Coating or impregnation materials applied by spraying
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は、コークス炉の熱間補修用材料およびコークス炉炉壁の補修方法、とくにコークス炉窯口からのガス漏れ、灰塵発生等を防止するために行われる、コークス炉炉壁の小目地切れ塞ぎ、れんが角割れ補修、鉄製フレームとれんがの間隙充填等に用いられる熱間補修用材料とこの材料を用いて行われる熱間補修方法に関するものである。
【0002】
【従来の技術】
コークス炉の熱間補修方法としては、耐火物粒子を補修部に溶融付着させる溶射補修方法と、無機バインダーと水とからなる結合材とシヤモツト、ハイアルミナ等の耐火物粒子とを混合して吹き付ける、吹き付け補修方法がある。
【0003】
上記溶射補修方法は、たとえば特公昭62−102082号公報等にも開示されているように、材料が溶融することで炉壁との付着力の強化や溶射材料自身の強度アップ等に効果がある。しかし、この技術は溶射時の高熱によって窯口付近の金物が損傷したり、溶射被膜特有の多孔質体に起因するガス漏れなどの問題が残されており、コークス炉窯口付近の補修には適さないという問題点があった。
この意味において、コークス炉窯口付近における小目地切れ塞ぎ、あるいはれんが角割れ補修、あるいは鉄製フレームとれんがとの間隙充填のようなガス漏れ起因となる部分の補修には、むしろ上記吹き付け補修方法の方が好ましいと言える。
【0004】
このような吹き付け補修方法としては、たとえば特開平8−119775号公報に記載されたような技術がある。この技術は、低融点ガラスを利用したガラスコーティング方法である。ただし、この既知技術は、窯口部のガス漏れ部位が金物とれんがとの隙間充填のときや、れんがの角割れ補修のとき、あるいは目地切れ塞ぎの場合にあっては、耐火物と吹き付け補修材との付着力不足、目地切れ部内部への吹き付け補修材料の充填不足等の問題が残り、ガス漏れ対策として十分な効果を発揮しているわけではない。
【0005】
【発明が解決しようとする課題】
以上説明したように、上記各従来技術によるコークス炉炉壁の補修、特に窯口付近のれんがの小目地切れ塞ぎ、れんが角割れ補修、鉄製フレームとれんがとの間隙充填等によるコークス炉の炉壁補修では次のような問題点があった。
(1) 溶射補修方法では;
▲1▼溶射補修時に発生する高温により鉄製フレームの損傷が懸念される。
▲2▼溶射被覆は本質的に多孔質であるためガス漏れ防止効果が少ない。
(2) 吹き付け補修方法では;
▲3▼れんがや、金物上への単なる吹き付けでは、付着力が不足する。
▲4▼小さな目地切れ補修では内部への充填性が悪い。
▲5▼窯口付近は温度変化が大きいため、吹き付け補修層であるガラス質皮膜が劣化する。
▲6▼目地切れ部へ充填した溶融ガラスの場合、収縮したときに空隙への充填性が低下する。
といった種々の問題点があった。
【0006】
本発明の主たる目的は、上記の各問題点を克服し、コークス炉窯口部のガス漏れを確実に防止するための技術を開発することにある。
本発明の他の目的は、ガス漏れや灰塵発生防止に優れたコークス炉炉壁の熱間補修用材料を提案することにある。
本発明のさらに他の目的は、コークス炉炉壁の小目地切れやれんが角割れ、れんがと金物との間隙充填のための有効な補修方法を提案することにある。
【0007】
【課題を解決するための手段】
さて、上掲の目的の実現に向けて鋭意検討した結果、発明者らは、コークス炉窯口付近の鉄製フレームヘ悪影響を与えずにガス漏れ、灰塵発生を防止できる緻密な補修層を得る方法としては、吹付け補修方法が有効であるとの知見の下に、従来の上記吹き付け補修方法の問題点を回避できる吹き付け補修材料と、この材料を用いた補修方法に想到した。
【0008】
すなわち、本発明は、固形分換算で100wt%の水ガラスに対し、骨材として、けい石れんが、ハイアルミナれんが及びシヤモットれんがのうちから選ばれるいずれか1種以上の、 1000 μm以下に粉砕したれんが屑からなる結晶質二酸化けい素含有化合物を20〜60wt%添加混合してなる、コークス炉の熱間補修用材料である。
なお、本発明において、上記結晶質二酸化けい素含有化合物としては、クォーツ、トリジマイト、クリストバライトのいずれか1種または2種以上の混合物を含むもの、具体的には、けい石れんが、ハイアルミナれんが及びシヤモットれんがのうちから選ばれるいずれか1種以上の、1000μm以下に粉砕したれんが屑を用いる。
なお、本発明において、上記水ガラスはけい酸ソーダを主とする固形分の比率が20〜65wt%のアルカリ−けい酸ガラスの濃厚水溶液を用いることが好ましい。さらに、本発明において、上記水ガラスはその固形分中にLi、Na、Kの酸化物もしくは水酸化物、またはR−Si(OH)2ONaで記述される有機シリコーン化合物の内、1種類あるいは複数種類の成分を含むことが好ましい。
【0009】
次に、本発明にかかるコークス炉炉壁の補修方法とは、コークス炉の炉壁の熱間補修に当たり、目地切れ部、れんが角割れ部または金物とれんがの間隙部に、固形分換算で 100wt%の水ガラスに対し、骨材として、けい石れんが、ハイアルミナれんが及びシヤモットれんがのうちから選ばれるいずれか1種以上の、 1000 μm以下に粉砕したれんが屑からなる結晶質二酸化けい素含有化合物を20〜60wt%添加混合してなる、コークス炉の熱間補修用材料を熱間で吹き付けることを特徴とする方法である。
【0010】
【発明の実施の形態】
コークス炉の窯口付近のれんがの小目地切れ塞ぎ、れんが角割れ補修、フレームとれんがの間隙充填などにより、ガス漏れや灰塵の発生を確実に防ぐには、吹き付け材料の吟味が重要である。即ち、上述した課題を解決するためには、小さな目地切れでもその内部に密に充填することができ、かつ温度変化があっても収縮の少ない補修用材料にすることが望まれる。しかも、形成した補修層がガラス化して炉壁面との接着力が上がるようにしなければならない。
【0011】
一般に、コークス炉の熱間吹き付け補修は、金物(鉄製フレーム)を含む炉壁の温度が 400〜 800℃になる。吹き付け補修用材料がこの温度( 400〜 800℃)で溶融流動性を示すようにするためには、けい酸ソーダを主成分とする水ガラスを用いることが効果的である。というのは、水ガラスを主材とする吹き付け補修用材料の場合、小さな目地切れ等への充填性が良好であるとともに、金物やれんがに対する付着力が良好なためである。
【0012】
また、本発明において用いる上記水ガラスとしては、その固形分中にLi、Na、Kの酸化物もしくは水酸化物、またはR−Si(OH)2ONaで記述される有機シリコーン化合物の内、1種類あるいは複数種類の成分を含んだものでもよい。
【0013】
次に、吹き付け補修層が、コークス炉の窯口部で大きな温度変化を受けても壁面から剥離しにくくするためには、補修層中のガラス成分の量を調整すること、すなわち、結晶化を促進する量に調整することが必要である。
そこで、補修層の結晶化促進のために、本発明では、補修用材料中に骨材として、クォーツ、トリジマイト、クリストバライトなどの結晶質二酸化けい素含有化合物を添加して、結晶化のための核を提供することにより、結晶化を促進することにした。
【0014】
たとえば、このような結晶化促進のために用いる具体的な材料として、けい石、ハイアルミナ、シヤモット等のれんが屑粉を、粒径1000μm以下の大きさに粉砕したものを添加する。つまり、目地充填のための吹き付け補修用材料の骨材として、けい石れんが屑、ハイアルミナれんが屑あるいはシヤモットれんが屑を用いることによって、これられんがに含まれる二酸化けい素の結晶を核として、水ガラス中の酸化けい素分の結晶化を促進し、補修層の結晶化度を大きくするのである。
このように水ガラス中に上記骨材成分を添加すると、熱間吹き付け補修層は周辺れんがの熱膨張、収縮にも十分に追従させることが可能となるのである。
【0015】
ここで、水ガラス中に添加するれんが屑粉の最大粒径を1000μm以下にした理由は、それよりも粒子が大きいと、2000μm以下程度の小さな小目地切れ部への充填が困難となること、また結晶化促進のためには粒径が小さい方が有利なためである。さらに、水ガラスとの混合の際に1000μmより大きい粗大粒では水ガラス中で沈降、分離が著しくなるからである。
【0016】
上記の補修用材料を熱間吹き付けするには、水ガラス中の固形分は20〜65wt%とすることが必要である。これは水ガラス中の固形分が65wt%を超えると、水ガラスに結晶質を添加したスラリーの粘度が高くなり、吹き付け施工のための補修材の輸送や、吹き付けノズルからの飛散状況などが悪化し、施工が困難となるからである。一方、その固形分が20wt%未満になると、補修材の輸送や施工性は良いが、補修材中の結晶化するけい石分の含有量が減少してしまい、施工後に熱を受けた際の結晶化率が低下してしまうために所望する補修層の品質を得ることができない。
【0017】
【実施例】
図2は水ガラスのみの吹付け補修材2を用いてコークス炉窯口部の目地切れ部1を塞ぐ補修を行う時の状況を模式的に示したものである。図2−aは、炉壁温度 800℃で目地切れ部1に吹き付け補修を実施している状況を示す。この場合、補修後コークス炉を稼働させて炉壁温度が上昇していくと、水ガラスが溶融し、目地切れ部1内に溶融浸透して、1000℃近辺では目地切れ部1内に充填され補修層ができる。そして、温度が上昇するに従って、その補修層中のアルカリ金属分が蒸発し、そのために補修層の流動性が低下する。同時に約1200℃程度で該補修層中のけい石の結晶化が始まるが、結晶質の骨材を含まない従来の吹き付け層では、結晶化が遅れ、1000℃−12時間程度でもほとんど結晶化は進まない。
また、この吹付け補修材では骨材がないため、図2−bに示すように、熱収縮が生じ目地切れ部1におおきな亀裂が入りやすい。しかも、結晶化が進まないため補修層は、ガラス質の部分が多くなり、図2−cに示すように、コークス炉からのコークス押し出しによる炉壁温度の低下にともない、炉壁とガラス質補修層との熱膨張率の差に起因して、該補修層が炉璧から剥離2′するという現象が起こりやすい。
【0018】
一方、図1に示す本発明の実施例では、骨材入り吹きつけ補修材2を吹き付けると(図1−a)、目地切れ部1に結晶質骨材3(あるいはれんが屑)を含む補修層が目地切れ部に形成される。そして、コークス炉の稼働により温度が上昇するにつれて、水ガラス中のアルカリ金属分が蒸発して、該結晶質骨材3あるいはれんが屑中の二酸化けい素の結晶を核としてけい石の結晶化が始まる。このとき該結晶質骨材あるいはれんが屑中の二酸化けい素の結晶を核として結晶化が進むため、従来例とは異なり、けい石の結晶化が飛躍的に進行する。その後、図1一bに示すように、添加した骨材周辺の結晶化が進んで、目地切れ部1に結晶化したけい石を含有した補修層が充填される。このため、図1−cに示すように、コークスの押し出し時の炉壁温度低下に対して炉壁面と補修層中の結晶質との熱膨張率がほぼ等しいため、目地切れ部内に微細な亀裂4は発生するものの、補修層の剥離は起こらない。
【0019】
表1は、本発明の実施例にあたる材料の組成と、比較例として結晶質の骨材を添加しない例(比較例1、2)、結晶質骨材の添加量が少ない例(比較例3)、結晶質骨材が多い例(比較例4)の組成と、それぞれの吹き付け施工の作業性を示した。結晶質骨材の漆加量の多い比較例4では、補修材の粘度が高く目地内部までの施工が不能であった。また、比較例5は水ガラス中の水分量が多い例、比較例6は水ガラス中の水分量が少ない例であるが、比較例5では施工性は良好であったが、材料中のけい石分の含有量がすくないため、結晶化が進まなかった。また比較例6では材料の粘度が高く、補修材の輸送、および施工が著しく困難であり、目地内部までの補修層を形成することができなかった。
これらの比較例に対し、本発明の実施例では、水ガラス中の水分量ならびに骨材のれんが粉量を様々に変更して施工性、および補修層中の結晶化率を調査したが、いずれも良好であった。なお、表1には骨材としてけい石れんが粉の例を示したが、補修材中の結晶化は、骨材中の二酸化けい素の結晶を核として進むものであり、シヤモットれんが(二酸化けい素:約40〜60wt%)、ハイアルミナれんが(二酸化けい素:約10〜30wt%)においても各に含有される二酸化けい素の結晶を核として同様の効果があることを確認した。
【0020】
【表1】
【0021】
次に、上記の実施例5と比較例2に示す補修材を用いて、コークス炉の窯口近傍の目地切れ補修を行い、施工後のコークス炉における石炭装人後のガス漏れ頻度の変化を調査した。その結果を表2に示す。なお、ガス漏れは炭化室から燃焼室へのリークをコークスサイドの燃焼室上部より観察したものである。表2に示すように、本発明方法によれば、施工直後のガス漏れ防止効果が顕著であり、効果の持続期間の延長も可能である。
【0022】
【表2】
【0023】
【発明の効果】
以上説明したように、本発明によれば、コークス炉の窯口部のガス漏れ、灰塵発生防止の補修が効果的に実施でき、その効果を長時間持続させることができる。従って、補修頻度の低減、コークス炉ガスのガス漏れなどによるエネルギーロスの低減に大きな効果が得られる。
【図面の簡単な説明】
【図1】本発明による吹き付け補修のもようを示す模式図
【図2】従来法の材料による吹き付け補修のもようを示す模式図
【符号の説明】
1 目地切れ部
2 補修材
3 結晶質骨材
4 亀裂[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot repair material for a coke oven and a method for repairing a coke oven wall, and in particular, to prevent gas leakage from the coke oven mouth, generation of ash dust, etc. The present invention relates to a hot repair material used for closing, brick square crack repair, gap filling between an iron frame and brick, and a hot repair method performed using this material.
[0002]
[Prior art]
As a hot repair method for the coke oven, a spraying repair method in which refractory particles are melted and adhered to the repaired portion, a binder composed of an inorganic binder and water, and refractory particles such as shyamoto and high alumina are mixed and sprayed. There is a spray repair method.
[0003]
The thermal spray repair method is effective in strengthening the adhesion to the furnace wall and increasing the strength of the thermal spray material itself by melting the material, as disclosed in, for example, Japanese Patent Publication No. Sho 62-1002082. . However, this technique still has problems such as damage to hardware near the kiln due to high heat during spraying and gas leakage due to the porous material peculiar to the sprayed coating. There was a problem that it was not suitable.
In this sense, the above-mentioned spraying repair method is more suitable for repairing parts that cause gas leakage such as clogging of small joints in the vicinity of the coke oven kiln, or repairing of square cracks in bricks, or gap filling between iron frames and bricks. It can be said that it is preferable.
[0004]
As such a spray repair method, for example, there is a technique as described in JP-A-8-119775. This technique is a glass coating method using low melting point glass. However, this known technology can be used for refractory and spray repairs when the gas leaking part of the kiln opening is filled with a gap between a hardware and a brick, when a brick is cracked, or when a joint is closed. Problems such as insufficient adhesion to the material and insufficient filling of the spray repair material inside the joints remain, and it does not exhibit a sufficient effect as a gas leakage countermeasure.
[0005]
[Problems to be solved by the invention]
As described above, coke oven furnace walls are repaired by the above-mentioned conventional techniques, in particular, brick joints near the kiln opening are repaired, brick cracks are repaired, gaps between iron frames and bricks are filled, etc. The repairs had the following problems.
(1) With thermal spray repair method;
(1) There is a concern about damage to the iron frame due to the high temperature generated during thermal spray repair.
(2) Since the thermal spray coating is essentially porous, there is little gas leakage prevention effect.
(2) In the spray repair method:
{Circle around (3)} Adhesion is insufficient when sprayed on bricks or hardware.
(4) In the case of small joint repairs, the filling property inside is poor.
(5) Since the temperature change is large in the vicinity of the kiln opening, the glassy film as the spray repair layer deteriorates.
(6) In the case of the molten glass filled in the joints, the filling ability into the voids is reduced when contracted.
There were various problems.
[0006]
The main object of the present invention is to develop a technique for overcoming the above-mentioned problems and reliably preventing gas leakage at the coke oven kiln opening.
Another object of the present invention is to propose a material for hot repair of a coke oven furnace wall which is excellent in preventing gas leakage and ash dust generation.
Still another object of the present invention is to propose an effective repairing method for filling small gaps in the coke oven furnace wall, corner cracking of bricks, and gap filling between bricks and hardware.
[0007]
[Means for Solving the Problems]
Now, as a result of diligent investigation toward the realization of the above-mentioned purpose, the inventors have developed a method for obtaining a dense repair layer that can prevent gas leakage and ash dust generation without adversely affecting the iron frame near the coke oven kiln. Came up with a spray repair material that can avoid the problems of the conventional spray repair method and a repair method using this material, based on the knowledge that the spray repair method is effective.
[0008]
That is, in the present invention, 100 wt% water glass in terms of solid content is ground to 1000 μm or less, which is at least one selected from silica brick, high alumina brick and syamoto brick as aggregate . This is a material for hot repair of a coke oven, which is prepared by adding 20 to 60 wt% of a crystalline silicon dioxide-containing compound made of brick scrap .
In the present invention, the crystalline silicon dioxide-containing compound includes one or a mixture of two or more of quartz, tridymite, and cristobalite , specifically , silica brick, high alumina brick and Any one or more selected from Syamoto bricks, brick scraps ground to 1000 μm or less are used .
In the present invention, the water glass is preferably a concentrated aqueous solution of alkali-silicate glass having a solid content ratio of 20 to 65 wt% mainly composed of sodium silicate. Further, in the present invention, the water glass may be one or more of oxides or hydroxides of Li, Na, K, or an organic silicone compound described by R—Si (OH) 2 ONa in the solid content. It is preferable to include a plurality of types of components.
[0009]
Next, the method of repairing a coke oven oven wall according to the present invention, hits the hot repair of the furnace wall of the coke oven, joint out portion, the gap of the brick angle cracking unit or hardware and bricks, in solid content conversion Containing 100% by weight of water glass as crystalline aggregate, consisting of silica brick, high-alumina brick and Syamot brick, crystalline silicon dioxide consisting of brick waste ground to 1000 μm or less This is a method characterized by spraying hot materials for hot repair of a coke oven, which are obtained by adding and mixing 20 to 60 wt% of a compound.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Examination of spraying materials is important in order to prevent gas leaks and ash generation by reliably closing brick joints near the mouth of the coke oven, repairing brick cracks, and filling gaps between frames and bricks. In other words, in order to solve the above-described problems, it is desired to make a repair material that can be tightly filled even in small joint breaks and has little shrinkage even when there is a temperature change. In addition, the repair layer formed must be vitrified to increase the adhesion with the furnace wall.
[0011]
In general, in the hot spraying repair of a coke oven, the temperature of the furnace wall including hardware (iron frame) becomes 400-800 ° C. In order for the spray repair material to exhibit melt fluidity at this temperature (400 to 800 ° C.), it is effective to use water glass mainly composed of sodium silicate. This is because, in the case of a spray repair material mainly composed of water glass, the filling property to small joint breaks and the like is good, and the adhesion to hardware and bricks is good.
[0012]
The water glass used in the present invention includes Li, Na, K oxides or hydroxides in the solid content, or an organic silicone compound described by R-Si (OH) 2 ONa. It may contain one kind or plural kinds of ingredients.
[0013]
Next, in order to make it difficult for the spray repair layer to peel off from the wall surface even if it undergoes a large temperature change at the mouth portion of the coke oven, the amount of the glass component in the repair layer is adjusted, that is, crystallization is performed. It is necessary to adjust the amount to promote.
Therefore, in order to promote the crystallization of the repair layer, in the present invention, a crystalline silicon dioxide-containing compound such as quartz, tridymite, cristobalite, etc. is added as an aggregate to the repair material, and the core for crystallization is added. It was decided to promote crystallization by providing.
[0014]
For example, as a specific material used for promoting the crystallization, a material obtained by pulverizing brick dust such as silica, high alumina, and syamot into a particle size of 1000 μm or less is added. In other words, by using silica brick scrap, high alumina brick scrap or Syamoto brick scrap as the aggregate of spray repair material for filling joints, water glass with silicon dioxide crystals contained in this brick as the nucleus It promotes the crystallization of the silicon oxide in it and increases the crystallinity of the repair layer.
When the aggregate component is added to the water glass as described above, the hot spray repair layer can sufficiently follow the thermal expansion and contraction of the peripheral brick.
[0015]
Here, the reason why the maximum particle size of the brick waste added to the water glass is set to 1000 μm or less is that, when the particles are larger than that, it becomes difficult to fill small small cut portions of about 2000 μm or less, Moreover, it is because a smaller particle size is advantageous for promoting crystallization. In addition, coarse particles larger than 1000 μm are significantly settled and separated in water glass when mixed with water glass.
[0016]
In order to spray the above repair material hot, the solid content in the water glass needs to be 20 to 65 wt%. If the solid content in the water glass exceeds 65 wt%, the viscosity of the slurry in which the crystalline material is added to the water glass will increase, and the transport of repair materials for spraying work and the scattering from the spray nozzle will deteriorate. This is because the construction becomes difficult. On the other hand, if the solid content is less than 20 wt%, the transportation and construction of the repair material are good, but the content of the crystallized silica in the repair material decreases, and when the heat is received after construction Since the crystallization rate is lowered, the desired quality of the repair layer cannot be obtained.
[0017]
【Example】
FIG. 2 schematically shows the situation when repairing the joint portion 1 of the coke oven kiln is performed using the spray repair material 2 made only of water glass. FIG. 2-a shows a situation where repair is being performed by spraying the joint wall 1 at a furnace wall temperature of 800 ° C. In this case, when the coke oven is operated after repair and the furnace wall temperature rises, the water glass melts and melts and penetrates into the joints 1 and fills in the joints 1 near 1000 ° C. A repair layer is created. As the temperature rises, the alkali metal component in the repair layer evaporates, and the fluidity of the repair layer decreases. At the same time, crystallization of the silica in the repair layer starts at about 1200 ° C, but in the conventional sprayed layer that does not contain crystalline aggregate, crystallization is delayed, and almost no crystallization occurs even at about 1000 ° C for 12 hours. Not proceed.
Moreover, since there is no aggregate in this spray repair material, as shown in FIG. 2-b, heat shrinkage | contraction arises and the big crack is easy to enter into the joint part 1. FIG. Moreover, since the crystallization does not proceed, the repair layer has a lot of vitreous parts, and as shown in FIG. 2-c, the furnace wall and the glassy repair are performed as the furnace wall temperature decreases due to coke extrusion from the coke oven. Due to the difference in thermal expansion coefficient with the layer, the phenomenon that the repair layer peels 2 ′ from the furnace wall is likely to occur.
[0018]
On the other hand, in the embodiment of the present invention shown in FIG. 1, when the aggregated spray repair material 2 is sprayed (FIG. 1-a), the repair layer containing the crystalline aggregate 3 (or brick scraps) in the joint portion 1 Is formed at the joints. Then, as the temperature rises due to the operation of the coke oven, the alkali metal content in the water glass evaporates, and the crystallization of the quartzite takes place with the
[0019]
Table 1 shows the composition of materials corresponding to the examples of the present invention, examples in which no crystalline aggregate is added as comparative examples (Comparative Examples 1 and 2), and examples in which the amount of crystalline aggregate added is small (Comparative Example 3). The composition of an example with a large amount of crystalline aggregate (Comparative Example 4) and the workability of each spraying construction were shown. In Comparative Example 4 in which the amount of lacquer added to the crystalline aggregate was large, the viscosity of the repair material was high, and it was impossible to construct the interior of the joint. Comparative Example 5 is an example in which the amount of water in the water glass is large, and Comparative Example 6 is an example in which the amount of water in the water glass is small. In Comparative Example 5, the workability was good, but Crystallization did not proceed because the stone content was low. In Comparative Example 6, the viscosity of the material was high, and it was extremely difficult to transport and construct the repair material, and it was impossible to form a repair layer up to the inside of the joint.
In contrast to these comparative examples, in the examples of the present invention, the water content in the water glass and the aggregate brick powder amount were variously changed to investigate the workability and the crystallization rate in the repair layer. Was also good. Table 1 shows an example of silica brick powder as the aggregate. Crystallization in the repair material proceeds with the silicon dioxide crystals in the aggregate as the core, and Syamot brick (silicon dioxide). Elemental: about 40-60 wt%) and high alumina bricks (silicon dioxide: about 10-30 wt%) were confirmed to have the same effect with the silicon dioxide crystals contained therein as nuclei.
[0020]
[Table 1]
[0021]
Next, using the repair materials shown in Example 5 and Comparative Example 2 above, repair the joint break near the kiln entrance of the coke oven, and change the frequency of gas leakage after coal erection in the coke oven after construction. investigated. The results are shown in Table 2. The gas leakage was observed from the upper part of the combustion chamber on the coke side from the carbonization chamber to the combustion chamber. As shown in Table 2, according to the method of the present invention, the effect of preventing gas leakage immediately after the construction is remarkable, and the duration of the effect can be extended.
[0022]
[Table 2]
[0023]
【The invention's effect】
As described above, according to the present invention, it is possible to effectively carry out repair for preventing gas leakage and ash dust generation at the mouth portion of the coke oven, and to maintain the effect for a long time. Therefore, a great effect can be obtained in reducing the energy loss due to the reduction of the repair frequency and the leakage of coke oven gas.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing how a spray repair is performed according to the present invention. FIG. 2 is a schematic diagram showing a spray repair using a conventional material.
1 Joint Cut 2
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07193897A JP3785724B2 (en) | 1997-03-25 | 1997-03-25 | Coke oven hot repair material and coke oven wall repair method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07193897A JP3785724B2 (en) | 1997-03-25 | 1997-03-25 | Coke oven hot repair material and coke oven wall repair method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10267559A JPH10267559A (en) | 1998-10-09 |
| JP3785724B2 true JP3785724B2 (en) | 2006-06-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07193897A Expired - Fee Related JP3785724B2 (en) | 1997-03-25 | 1997-03-25 | Coke oven hot repair material and coke oven wall repair method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3785724B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006328128A (en) * | 2005-05-24 | 2006-12-07 | Jfe Refractories Corp | Sealing material for blocking gas of coke oven, etc. |
| CZ297828B6 (en) * | 2006-03-09 | 2007-04-04 | Famo - Servis, Spol. S R. O. | Powder mixture for repairs of coking chambers in hot state |
| BE1017674A3 (en) * | 2007-07-05 | 2009-03-03 | Fib Services Internat | REFRACTORY WALL CHAMBER TREATING COMPOSITION AND METHOD FOR CARRYING OUT THE SAME. |
| LU92339B1 (en) * | 2013-12-19 | 2015-06-22 | Fib Services Intellectual Sa | Siliceous composition and process for obtaining it |
| JP6049213B2 (en) * | 2014-06-19 | 2016-12-21 | 品川リフラクトリーズ株式会社 | Coke oven joint repair material |
| JP7476712B2 (en) * | 2020-08-03 | 2024-05-01 | Agc株式会社 | Method for manufacturing seal structure, and seal structure |
-
1997
- 1997-03-25 JP JP07193897A patent/JP3785724B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10267559A (en) | 1998-10-09 |
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