JPH0245110B2 - - Google Patents
Info
- Publication number
- JPH0245110B2 JPH0245110B2 JP62122692A JP12269287A JPH0245110B2 JP H0245110 B2 JPH0245110 B2 JP H0245110B2 JP 62122692 A JP62122692 A JP 62122692A JP 12269287 A JP12269287 A JP 12269287A JP H0245110 B2 JPH0245110 B2 JP H0245110B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- combustion
- refractory
- easily oxidizable
- repair
- 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 - Lifetime
Links
- 239000007789 gas Substances 0.000 claims description 87
- 239000002245 particle Substances 0.000 claims description 57
- 230000008439 repair process Effects 0.000 claims description 44
- 229910052751 metal Inorganic materials 0.000 claims description 30
- 239000002184 metal Substances 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 29
- 238000007254 oxidation reaction Methods 0.000 claims description 29
- 238000002485 combustion reaction Methods 0.000 claims description 26
- 239000011819 refractory material Substances 0.000 claims description 22
- 239000007921 spray Substances 0.000 claims description 21
- 238000005507 spraying Methods 0.000 claims description 16
- 229910052752 metalloid Inorganic materials 0.000 claims description 4
- 150000002738 metalloids Chemical class 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000012476 oxidizable substance Substances 0.000 description 46
- 239000010410 layer Substances 0.000 description 31
- 239000000463 material Substances 0.000 description 29
- 239000000843 powder Substances 0.000 description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 14
- 239000000203 mixture Substances 0.000 description 14
- 239000000758 substrate Substances 0.000 description 12
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 239000012790 adhesive layer Substances 0.000 description 7
- 238000004901 spalling Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 5
- 229910001882 dioxygen Inorganic materials 0.000 description 5
- 238000010285 flame spraying Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 239000001294 propane Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007751 thermal spraying Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000011863 silicon-based powder Substances 0.000 description 2
- 208000031872 Body Remains Diseases 0.000 description 1
- 229910004709 CaSi Inorganic materials 0.000 description 1
- 229910015136 FeMn Inorganic materials 0.000 description 1
- 229910005347 FeSi Inorganic materials 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 206010016754 Flashback Diseases 0.000 description 1
- 229910020068 MgAl Inorganic materials 0.000 description 1
- 229910004534 SiMn Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、耐火物の火炎溶射補修方法に関し、
さらに詳しくは窯炉または金属溶湯用炉の内張り
耐火物の補修方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flame spray repair method for refractories,
More specifically, the present invention relates to a method for repairing a refractory lining of a kiln or a furnace for molten metal.
従来の火炎溶射補修技術として特公昭49−
46364に記述される方法は次の通りである。
As a conventional flame spraying repair technology
The method described in 46364 is as follows.
修復すべき炉壁材質と同様な組成を有する補修
用耐火材粉粒を用い、この耐火材粉粒に、金属粉
粒を配合する。この金属粉粒を酸素で燃焼させた
ときの発熱を利用すると共に、金属粉粒自身も酸
化物となり耐火物体を形成する。 A refractory material powder for repair having a composition similar to that of the furnace wall material to be repaired is used, and metal powder is mixed with the refractory material powder. The heat generated when the metal powder is combusted with oxygen is utilized, and the metal powder itself also becomes an oxide to form a refractory object.
この方法では以下の問題がある。 This method has the following problems.
(1) 通常、耐火材を溶射補修する場合の供給熱量
は、例えば次の文献、
製鉄研究No.305，1981，
『コークス炉の溶射補修』
鉄と鋼No.４ vol.69，1983
『溶射装置の開発と溶射条件の検討』
に示されるように、材質により若干差はあるもの
の、5000〜8000kcal／Kgであるのに対し、上記方
法は、金属粉粒を20〜30重量％含有した場合でも
2000〜3000kcal／Kgであり、その熱量はガスある
いは固体の熱料を用いるときの1/2程度であるた
め、全体の耐火材粉粒を溶融あるいは半溶融の状
態にするには熱量が小さ過ぎる。このため、緻密
で強固な耐火物の付着層を得るのは困難になる。
これに対し、熱量を大きくするのに金属粉粒の量
を増加する手段も考えられるが、吹付け材の単価
の上昇に伴ない、所詮コスト低下を目的とする補
修には不向きになる。(1) Normally, the amount of heat supplied when repairing refractory materials by thermal spraying is determined by, for example, the following documents: Steel Manufacturing Research No. 305, 1981, ``Thermal Spraying Repair of Coke Ovens'' Tetsu-to-Hagane No. 4, vol. 69, 1983, ``Thermal Spraying'' As shown in ``Equipment Development and Study of Thermal Spraying Conditions'', although there are slight differences depending on the material, it is 5000 to 8000 kcal/Kg, whereas the above method uses 20 to 30% by weight of metal powder. but
The amount of heat is 2000 to 3000 kcal/Kg, which is about 1/2 of that when using gas or solid heating material, so the amount of heat is too small to make the entire refractory material powder molten or semi-molten. . For this reason, it becomes difficult to obtain a dense and strong adhesion layer of refractory material.
On the other hand, increasing the amount of metal powder particles may be considered to increase the amount of heat, but as the unit price of the sprayed material increases, it becomes unsuitable for repairs aimed at reducing costs.
(2) さらに同方法では、使用する金属粉粒は
50μmより小さい大きさで、かつ酸素によつて
搬送することになつているが、通常金属粉粒
は、特に微粉の場合、安全な取扱いをすること
が難しく、特化則第２類に属するものが殆どで
ある。にもかかわらず、同方法は酸素によつて
搬送する機構をとつているため、さらに危険増
大をもたらし、極めて不安全な作業を強いられ
ることになる。(2) Furthermore, in the same method, the metal powder used is
Although the size of metal powder is smaller than 50 μm and it is supposed to be transported using oxygen, it is difficult to handle metal powder safely, especially when it is a fine powder, and it belongs to Category 2 of the Special Regulations. Most of them are. Nevertheless, this method uses a mechanism for transporting oxygen, which further increases the risk and forces extremely unsafe work.
(3) また、耐火材と混合した金属粉の酸化発熱を
利用するため、基体に予熱を施す工程を取るこ
とが困難である。このことは補修部基体が例え
ば高温生産物と離脱した直後の高温状態を保つ
ている時期に補修する必要がある。補修部基体
は局部的に急激な加熱条件にさらされ、さらに
加熱終了時においては、急激な冷却状態を課せ
られることとなり、熱的スポーリング損傷を起
こす原因になることは勿論、基体表面の温度が
低い場合には補修材の接着性が劣ることにな
り、補修層の耐用性が劣るものとなる問題があ
る。(3) Furthermore, since the heat generated by oxidation of the metal powder mixed with the refractory material is used, it is difficult to preheat the base. For this reason, it is necessary to carry out the repair at a time when the repair part base body remains in a high temperature state, for example, immediately after separation from the high-temperature product. The base of the repaired part is exposed to local rapid heating conditions, and furthermore, at the end of the heating, it is forced to cool down rapidly, which not only causes thermal spalling damage but also reduces the temperature of the base surface. If this is low, the adhesion of the repair material will be poor, leading to a problem that the repair layer will have poor durability.
易被酸化性物質粉粒を配合した吹付け材を用い
る溶射補修においては、安全操業、コスト低減、
易被酸化性物質粉粒の燃焼性向上、補修部基体お
よび吹付け補修層の熱的スポーリング損傷防止、
吹付け補修層の基体への接着性向上および吹付け
補修層の緻密化が重要となる。 Thermal spraying repairs using spraying materials containing easily oxidizable substance powders ensure safe operation, cost reduction,
Improves the combustibility of easily oxidizable substance powder, prevents thermal spalling damage to the repair part base and sprayed repair layer,
It is important to improve the adhesion of the sprayed repair layer to the substrate and to make the sprayed repair layer denser.
本発明者らは、さきにこのような問題点を解決
した火炎溶射補修方法を提案した（特願昭60−
239504）。 The present inventors previously proposed a flame spraying repair method that solved these problems (patent application filed in 1983-
239504).
その技術手段は次の通りである。 The technical means are as follows.
(a) 安全性向上コスト低減化については、使用す
る易被酸化性物質の平均粒径を50μm以上にす
る。(a) In order to improve safety and reduce costs, the average particle size of easily oxidizable substances used should be 50 μm or more.
(b) スポーリング損傷の防止については、基材の
予熱および補修層の徐冷を行う。この予熱およ
び徐冷用には、ガス火炎を用いる。(b) To prevent spalling damage, preheat the base material and slowly cool the repair layer. A gas flame is used for this preheating and slow cooling.
(c) 接着性を向上するには、吹付けの火炎および
耐火材粉粒の昇温状態も重要であるが、補修部
基体の温度が高いことも重要である。この基体
の予熱については上記(b)の基体予熱を利用する
ことができる。(c) In order to improve adhesion, the temperature of the spray flame and the refractory material powder particles are important, but it is also important that the temperature of the repair part base is high. For preheating this substrate, the above-mentioned (b) substrate preheating can be used.
(d) 補修層自身の緻密性を向上する方法として
は、吹付け材が基体に到着するまでに、耐火材
粒子は溶融あるいは半溶融し易い状態に、ま
た、易被酸化性物質の粒子は酸化反応を起こし
易い状態になることが必要で、このために吹付
け材吐出と同時に可燃性ガスを噴出し、吹付け
材吐出と同時にガス炎を形成し、この火炎熱に
より、易被酸化性物質粉粒の燃焼性を良くし、
また、耐火材粒子が溶融あるいは半溶融状態に
なるのを助ける。(d) As a method of improving the density of the repair layer itself, by the time the spraying material reaches the base, the refractory material particles are in a state where they are easily melted or semi-melted, and the particles of easily oxidizable substances are It is necessary to be in a state where oxidation reactions can easily occur, and for this purpose, flammable gas is ejected at the same time as the spraying material is discharged, and a gas flame is formed at the same time as the spraying material is discharged. Improves the combustibility of material particles,
It also helps the refractory particles become molten or semi-molten.
本発明方法は以上の技術をさらに発展させたも
ので、補修用の耐火性酸化物粒子に易被酸化性の
金属または半金属粒子を配合した材料を、ランス
ノズルより可燃性ガスと同時に、支燃性ガスの中
に吐出し、可燃性ガスの燃焼熱によつて昇熱し、
溶融または半溶融し易い状態になつた耐火性粒子
を基体補修面において、吹付け材混合物中の易被
酸化性物質が、酸化反応によつて自から耐火性溶
融酸化物となると共に発生した酸化熱によつて基
体補修部に溶着し、付着層を形成し、耐火物壁の
補修部を修復する技術を確実に遂行するための具
体的手段を提供するものである。
The method of the present invention is a further development of the above-mentioned technology, in which a material containing easily oxidizable metal or metalloid particles is mixed with refractory oxide particles for repair use through a lance nozzle at the same time as flammable gas. It is discharged into flammable gas and heated up by the heat of combustion of flammable gas,
When the refractory particles, which are easily melted or semi-molten, are applied to the repair surface of the base, the easily oxidizable substances in the sprayed material mixture automatically become refractory molten oxides through an oxidation reaction, and the oxidation that occurs The present invention provides a concrete means for reliably carrying out a technique for repairing a repaired part of a refractory wall by welding the repaired part to a base body by heat and forming an adhesion layer.
上記(d)において、易被酸化性物質の粒子を完全
に酸化反応を終了させるための手段として、燃焼
して耐火性酸化物を形成する50μm以上の易酸化
性金属または半金属の粒子の一種以上と耐火性酸
化物粒子とからなる前記混合耐火材料を用い、同
時に噴出する支燃性ガスの供給量を、供給した可
燃性ガスの理論燃焼当量分と、同時に供給した易
被酸化性物質の理論酸化反応当量の３倍以上の量
との合計量を供給し、可燃性ガスの完全燃焼を促
進すると共に、さらに過剰の支燃性ガスによつて
易被酸化性物質粒子との接触を増加し、同物質の
酸化反応の活性化を促進する。
In (d) above, as a means to completely terminate the oxidation reaction of particles of easily oxidizable substances, a type of easily oxidizable metal or metalloid particles of 50 μm or more that are combusted to form refractory oxides. Using the above-mentioned mixed refractory material consisting of the above and refractory oxide particles, the amount of combustion-supporting gas ejected at the same time is equal to the theoretical combustion equivalent of the supplied combustible gas and the amount of the easily oxidizable substance supplied at the same time. Supplying a total amount that is more than three times the theoretical oxidation reaction equivalent, promotes complete combustion of flammable gas, and further increases contact with easily oxidizable material particles due to excess combustion-supporting gas. and promotes the activation of the oxidation reaction of the same substance.
さらにこの方法において可燃性ガスとして耐火
性酸化物粒子１Kg当り5000kcal以下の発熱量を有
する可燃性ガスを供給すると極めて好ましい結果
を得ることができる。 Furthermore, in this method, extremely favorable results can be obtained if a flammable gas having a calorific value of 5000 kcal or less per 1 kg of refractory oxide particles is supplied as the flammable gas.
本発明方法では、易被酸化性物質自身は酸化熱
を発生すると同時に、耐火性溶融酸化物となり、
可燃性ガスの燃焼火炎によつて昇熱され、溶融あ
るいは半溶融し易い状態になつた耐火性粒子の表
面部と融着し、付着層を形成する。
In the method of the present invention, the easily oxidizable substance itself generates oxidation heat and at the same time becomes a refractory molten oxide.
The heat is raised by the combustion flame of the combustible gas, and the particles are fused to the surface of the refractory particles, which are easily melted or semi-molten, to form an adhesion layer.
供給した可燃性ガスの理論燃焼当量分の支燃性
ガスと、同時に供給した易被酸化性物質の理論酸
化反応当量の３倍以上の量の支燃性ガスを同時に
噴出することにより、可燃ガスの完全燃焼および
易被酸化性物質の酸化反応を促進し、吹付け材と
基体との接着性および付着層の緻密性が良好なも
のを形成する。 Combustible gas It promotes the complete combustion of substances and the oxidation reaction of easily oxidizable substances, thereby forming a material with good adhesion between the sprayed material and the substrate and a dense adhesion layer.
易被酸化性物質を配合して補修を行う方法につ
いて特公昭49−46364においては使用する易被酸
化性物質の粒度は平均50μmより小さいものを用
いるとしており、その理由としては平均50μmよ
り大きくなると易被酸化性物質の酸化燃焼性が悪
化し、付着層の性状が不良となり、耐用性が低下
するとし、その最適粒径は10μm以下のときに好
結果が得られるとある。 Regarding the method of repair by blending an easily oxidizable substance, Japanese Patent Publication No. 49-46364 states that the particle size of the easily oxidizable substance to be used should be smaller than 50 μm on average. It is said that the oxidative combustion properties of easily oxidizable substances deteriorate, the properties of the adhesion layer deteriorate, and the durability decreases, and that good results can be obtained when the optimum particle size is 10 μm or less.
しかし同方法のように50μmより小さい粒径で、
しかも最適が10μm以下という非常に微細な粒径
体から成る易被酸化性物質を用いた場合、耐火性
物質との混合あるいは吹付け装置への搬入などの
前作業中、また吹付け操作中においても、搬送管
内の圧力低下などに起因する逆火など、微細な易
被酸化性物質の取り扱いにおいては、非常な危険
が伴なう。さらに、同方法においては、吹付け機
への供給は酸素含有ガスで行なうものとしてお
り、操作上の危険はさらに増大する。 However, as in the same method, with particle sizes smaller than 50 μm,
Moreover, when using easily oxidizable substances consisting of very fine particles with an optimum diameter of 10 μm or less, there is a risk of However, handling of minute oxidizable substances poses great dangers, such as flashbacks caused by pressure drop in the conveyor pipes. Furthermore, in this method, the spraying machine is supplied with oxygen-containing gas, which further increases operational risks.
本発明は、このような易被酸化性物質の取扱い
操作上の安全性を重視し、易被酸化性物質の平均
粒径ができる限り大きいものを使用する。従つて
安全性が向上すると共に、付着層の基体への接着
性および付着層自身の緻密性が向上する。 The present invention places emphasis on safety in handling such easily oxidizable substances, and uses easily oxidizable substances having as large an average particle size as possible. Therefore, safety is improved, and the adhesion of the adhesive layer to the substrate and the density of the adhesive layer itself are improved.
使用する易被酸化性物質の平均粒径を50μm以
上にすることで燃焼性が低下するが、この燃焼性
を増大するために、混合耐火材料に配合した耐火
性粒子１Kg当り5000kcal以下、好ましくは2000〜
4000kcalの燃焼による発熱量を有する可燃性ガス
あるいは不活性ガスと可燃性ガスの混合ガスによ
つて材料供給装置より搬送した材料と同時に、酸
素あるいは空気などの支燃性ガスの噴流中に吐出
する。すなわち、まずノズルから吐出直後に可燃
性ガスの着火、燃焼が起こり、直ちに高温の火炎
が形成される。この高温の火炎内に放出された易
被酸化性物質の粒子は直ちに高温に加熱されて燃
焼し易い状態になる。 Flammability is reduced by setting the average particle size of the easily oxidizable substance used to be 50 μm or more, but in order to increase this combustibility, it is preferably 5000 kcal or less per 1 kg of refractory particles mixed in the mixed refractory material. 2000〜
The material is transported from the material supply device using a combustible gas with a calorific value of 4000 kcal or a mixture of inert gas and combustible gas, and is simultaneously discharged into a jet of combustion-supporting gas such as oxygen or air. . That is, first, ignition and combustion of the combustible gas occur immediately after it is discharged from the nozzle, and a high-temperature flame is immediately formed. Particles of easily oxidizable substances released into this high-temperature flame are immediately heated to a high temperature and become easily combustible.
このとき、供給する可燃性ガスによる燃焼熱量
は、前述したように、通常溶射補修で供給する
5000〜8000kcal／Kgのような高い熱量ではないた
め、火炎内（ノズルと基体間の火炎）で吹付け材
が溶融するまでには至らない。この現象について
発明者らは、吹付け中の火炎中（ノズル先端より
100，200，300mm）に、水冷された中空ステンレ
ス鋼管を挿入して飛行中の吹付け材を吸引、捕集
して、その粒子を電子顕微鏡で観察した結果、未
吹付け材粒子と何ら形状に差異は認められなかつ
た実験結果を得ている。しかし、同時に吹付け材
中の配合した該易被酸化性物質は酸化反応を起こ
し易い状態になつて、同火炎で加熱された補修基
体面に達すると同時に、易被酸化性物質の酸化反
応が起こり、発熱し、この発熱量が加算され、耐
化性物質粒を溶融あるいは半溶融状態にして溶着
する。このように可燃性ガスの同時噴出を行なう
ことにより、その火炎を用いることによつて、安
全性を確保するために粒径を大きくし、敢えて燃
焼性を低下せしめた分を容易に補償し、何ら支障
をもたらすことなく吹付け補修を実施することが
できる。 At this time, the amount of combustion heat from the supplied flammable gas is usually supplied through thermal spray repair, as mentioned above.
Since the amount of heat is not as high as 5,000 to 8,000 kcal/Kg, the sprayed material does not melt within the flame (the flame between the nozzle and the base). Regarding this phenomenon, the inventors discovered that during flame spraying (from the nozzle tip)
100, 200, 300 mm), a water-cooled hollow stainless steel tube was inserted to suck up and collect the sprayed material in flight, and the particles were observed using an electron microscope. We obtained experimental results in which no difference was observed. However, at the same time, the easily oxidizable substance mixed in the spray material becomes susceptible to oxidation reactions, and at the same time as it reaches the surface of the repair base heated by the same flame, the oxidation reaction of the easily oxidizable substance begins. This heat generation is added, and the heat-resistant material particles are melted or semi-molten and welded. By ejecting combustible gas simultaneously in this way, by using the flame, the particle size is increased to ensure safety, and the intentionally reduced combustibility can be easily compensated for. Spray repair can be carried out without causing any problems.
通常、可燃性ガスあるいは易被酸化性物質粒を
燃焼（酸化）する場合には、これらの燃焼あるい
は酸化反応に必要な当量分の支燃性ガスを供給す
る。 Normally, when burning (oxidizing) flammable gas or easily oxidizable substance particles, an equivalent amount of combustion-supporting gas necessary for the combustion or oxidation reaction is supplied.
しかし、窯炉ライニングの火炎溶射補修では、
吹付け材料を同時に供給するために、吐出先端孔
（ノズル）は、火炎を作るためだけの可燃性ガス
供給用孔径より大きくなる。このことは、すなわ
ち可燃性ガスと支燃性ガスの混合性が低下し、可
燃性ガスの完全燃焼を完成するには、吐出口先端
からの距離が長くなり（フレーム長さが長くな
る）、続いて易被酸化性物質を支燃性ガスで燃焼
（酸化）する時点では、支燃性ガスの拡散あるい
は周囲雰囲気ガス（通常は空気）の巻き込みによ
り、支燃性ガス雰囲気が希薄になり、易被酸化性
物質の燃焼（酸化）が起こり難くなり、良好な補
修層が得られなくなる。 However, in flame spray repair of furnace lining,
In order to simultaneously supply the spray material, the discharge tip hole (nozzle) has a larger diameter than the combustible gas feed hole diameter solely for creating the flame. This means that the mixability of flammable gas and combustion-supporting gas decreases, and in order to complete combustion of flammable gas, the distance from the tip of the discharge port becomes longer (the frame length becomes longer). Next, when easily oxidizable substances are burned (oxidized) with a combustion-supporting gas, the combustion-supporting gas atmosphere becomes diluted due to diffusion of the combustion-supporting gas or entrainment of surrounding atmospheric gas (usually air). Combustion (oxidation) of easily oxidizable substances becomes difficult to occur, making it impossible to obtain a good repair layer.
このような実状を打開するために、可燃性ガス
の燃焼後のフレーム雰囲気を高支燃性ガス雰囲気
状態、すなわち供給した可燃性ガスの理論燃焼当
量分の支燃性ガスと供給した吹付け材中の易被酸
化性物質の理論酸化反応当量の３倍以上、好まし
くは４〜15倍の量の支燃性ガスを合計して供給す
ることにより、基体との接着が密着しかつ付着性
も緻密なものを得た。 In order to overcome this situation, the flame atmosphere after the combustion of combustible gas is changed to a highly combustible gas atmosphere, that is, the combustible gas equivalent to the theoretical combustion equivalent of the supplied combustible gas and the supplied spray material. By supplying a total amount of combustion-supporting gas that is at least 3 times, preferably 4 to 15 times, the theoretical oxidation reaction equivalent of the easily oxidizable substance in the material, the adhesion to the substrate will be tight and the adhesion will be improved. I got something detailed.
ノズルから噴射して生成しした火炎は、ノズル
出口の直近でC3H8ガスの燃焼が起り、この火炎
中で、金属粉を含んだ溶射材及び支燃性ガスが同
時に加熱され、活性化される。活性化された金属
粉及び高温の支燃性ガスは、酸化反応（燃焼）し
やすい状態となり、加熱された補修部基体面に衝
突したとき激しく酸化反応を起す。この場合、大
きな粒子の金属粉は一定量以上の過剰の支燃性ガ
スを供給することによつて酸化物溶融体となる。
このような手段によつて、金属粉の粒子を大きく
した場合でも、溶射補修を容易に行うことができ
る。 The flame generated by injection from the nozzle causes combustion of C 3 H 8 gas in the vicinity of the nozzle outlet, and in this flame, the thermal spray material containing metal powder and the combustion-supporting gas are simultaneously heated and activated. be done. The activated metal powder and high-temperature combustion-supporting gas are in a state where they are susceptible to oxidation reaction (combustion), and when they collide with the heated repair part base surface, a violent oxidation reaction occurs. In this case, the large particle metal powder becomes an oxide melt by supplying a certain amount or more of excess combustion supporting gas.
By such means, thermal spray repair can be easily performed even when the particles of metal powder are made large.
易被酸化性物質の平均粒径が50μm以上を用い
る場合において、該物質の酸化当量より過剰の支
燃性ガスを供給する方法を、前記特公昭49−
46364によつて行つた場合では、易被酸化性物質
の粒径が大きくなつた分の酸化反応促進性には何
ら効果が認められず、耐火物の補修は不可能であ
つた。このことからも易被酸化性物質の平均粒径
が50μm以上からなるものを用いて、操業の安全
性、補修層の耐用性等の向上および低コスト化を
目的とした本発明では、可燃性ガス炎と易被酸化
性物質の酸化反応当量の支燃性ガス過剰添加法が
極めて効果的であると言うことができる。 When using an easily oxidizable substance with an average particle size of 50 μm or more, a method for supplying combustion-supporting gas in excess of the oxidation equivalent of the substance is described in
46364, no effect was observed in promoting oxidation reaction due to the increased particle size of the easily oxidizable substance, and it was impossible to repair the refractory. For this reason, in the present invention, which aims to improve operational safety, the durability of the repair layer, etc., and reduce costs, by using easily oxidizable substances with an average particle size of 50 μm or more, flammable It can be said that the method of adding an excess of combustion-supporting gas in an amount equivalent to the oxidation reaction between a gas flame and an easily oxidizable substance is extremely effective.
ただし、本発明においても支燃性ガス供給比率
が15を越えると、供給した多量の支燃性ガスの顕
熱により、易被酸化性物質を燃焼（酸化）する雰
囲気内ガスの温度が低下するために、第１図に示
したように、付着層の気孔率が大きくなり、脆弱
な層となつて補修層の耐用性が低下した。 However, even in the present invention, if the combustion-supporting gas supply ratio exceeds 15, the temperature of the gas in the atmosphere that burns (oxidizes) easily oxidizable substances decreases due to the sensible heat of the large amount of combustion-supporting gas supplied. As a result, as shown in FIG. 1, the porosity of the adhesion layer increased, making it a brittle layer and reducing the durability of the repair layer.
また、可燃性ガスにより、該混合材料中の耐火
性物質１Kg当り5000kcalを越える熱量を供給した
場合には、これに相当する支燃性ガスを増加する
ことが必要となり、コスト高になるばかりでな
く、高熱量供給によつて、易被酸化性物質および
耐火性物質粉粒の溶融物が吐出口（ノズル）先端
部に付着し、ノズル閉塞あるいはフレームの乱れ
を発生し易くなり、操業上不適な状態になるので
好ましくない。 Furthermore, if a flammable gas supplies more than 5,000 kcal of heat per 1 kg of refractory material in the mixed material, it will be necessary to increase the amount of combustion-supporting gas equivalent to this amount, which will only increase costs. However, by supplying a high amount of heat, molten powder of easily oxidizable substances and refractory substances adheres to the tip of the discharge port (nozzle), which tends to cause nozzle blockage or frame disturbance, making it unsuitable for operation. This is not desirable because it will lead to a situation where
さらに、本法において、操業上の危検性が大き
いと指摘した平均50μm未満の易被酸化性物質を
配合した場合には、可燃性ガスと支燃性ガスの燃
焼炎熱により、微粉状の易被酸化性物質が酸化反
応し易い状態になり、吐出口（ノズル）先端で溶
融物の付着が著しく、吐出口の閉塞あるいはフレ
ームの乱れが発生し、良好な補修層が得られなく
なることはもちろん、操業上の危険性が増大す
る。 Furthermore, in this method, if easily oxidizable substances with an average size of less than 50 μm are mixed, which has been pointed out as having a high operational risk, the heat of the combustion flame of combustible gas and combustion-supporting gas will cause fine powder to easily form. The oxidizable substances become susceptible to oxidation reactions, and the adhesion of molten material to the tip of the nozzle causes blockage of the nozzle or disturbance of the frame, which of course makes it impossible to obtain a good repair layer. , increasing operational risks.
以上のような方法により吹付け補修をより安全
なものにするため易被酸化性物質の粒径は、より
大きいものを使用するのが望まししいが、粒径が
大きくなつて従つて、付着率が低下し、付着層の
性状は劣化する。これを防止するためには、可燃
性ガスの供給量を多くする手段もあるが、この場
合可燃性ガスの供給量を多くすることは当然、支
燃性ガスの供給量も多くなり、コスト上昇を招く
ので好ましくない。 In order to make spray repair safer using the method described above, it is desirable to use larger particles of easily oxidizable substances; The rate decreases and the properties of the deposited layer deteriorate. In order to prevent this, there is a way to increase the amount of flammable gas supplied, but in this case, increasing the amount of flammable gas supplied naturally also increases the amount of combustible gas supplied, which increases costs. This is not desirable because it invites
これらについての種々実験結果の例を第１図か
ら第３図に示す。 Examples of various experimental results regarding these are shown in FIGS. 1 to 3.
第１図はアルミナ質（Al2O385重量％、
SiO2B10重量％、その他Fe2O3、CaO）の耐火材
料粉に平均粒径100μmの金属アルミニウム粉を10
重量％配合した場合で、支燃性ガスとして酸素ガ
スを用い、可燃性ガスとしてプロパンガスを使用
し、配合した金属アルミニウム粉の酸化反応熱も
加え、耐火材料粉１Kg当り、3500kcalの熱量とな
るように配合して吹付けた場合において、供給し
たプロパンガスの理論燃焼当量の支燃ガスを除
き、金属アルミニウム粉の理論酸化反応当量に対
する酸素ガス量比率と付着層の気孔率との関係を
示す。 Figure 1 shows alumina (Al 2 O 3 85% by weight,
10% by weight of metal aluminum powder with an average particle size of 100 μm was added to the refractory material powder of SiO 2 B (10% by weight, other Fe 2 O 3 , CaO).
When mixed by weight, oxygen gas is used as the combustible gas, propane gas is used as the combustible gas, and the heat of the oxidation reaction of the mixed metal aluminum powder is added, the amount of heat is 3500 kcal per 1 kg of refractory material powder. This shows the relationship between the ratio of oxygen gas amount to the theoretical oxidation reaction equivalent of metal aluminum powder and the porosity of the deposited layer, excluding the combustion supporting gas of the theoretical combustion equivalent of the supplied propane gas, when sprayed with the following composition. .
可燃性ガスであるプロパンガスの理論燃焼当量
分の酸素ガスの他に供給した酸素量が易被酸化性
物質の金属アルミニウム粉の理論酸化反応当量と
の比率が２以下では付着層の気孔率が35％以上で
多孔質なものであるが、この比率が３以上になる
と、付着層の気孔率が20％以下となり緻密な付着
層を確保することができる。しかしその比率が15
を超えると、付着層の気孔率が増して補修層とし
ての耐用の効果がなくなる。 If the ratio of the amount of oxygen supplied in addition to the theoretical combustion equivalent of propane gas, which is a combustible gas, to the theoretical oxidation reaction equivalent of metal aluminum powder, which is an easily oxidizable substance, is less than 2, the porosity of the deposited layer will increase. When the ratio is 35% or more, it is porous, but when this ratio is 3 or more, the porosity of the adhesive layer becomes 20% or less, and a dense adhesive layer can be ensured. However, the ratio is 15
If it exceeds this, the porosity of the adhesion layer will increase and it will no longer be effective as a repair layer.
このことからも第１図に示したように、可燃性
ガスを利用すると共に、そのとき易被酸化性物質
の酸化反応を促進するために、その酸化反応当量
分の３倍以上15倍以下の支燃性ガスを付加するこ
とが効果的であることが分る。 From this, as shown in Figure 1, in order to utilize flammable gas and promote the oxidation reaction of easily oxidizable substances, it is necessary to It turns out that adding combustion-supporting gas is effective.
第２図は、可燃性ガスを供給しない場合、すな
わち易被酸化性物質（この場合は金属アルミニウ
ム粉）の酸素ガスによる酸化反応熱のみによつて
得られた付着層の気孔率を易被酸化性物質の平均
粒径に対して示したものである。金属アルミニウ
ム粉の配合量はＡ，Ｂ，Ｃの曲線では、それぞれ
10，15，20重量％配合した場合である。金属アル
ミニウム粉の配合量が大きくなると付着層の気孔
率は確かに小さくなるが、例えば曲線Ｂ、すなわ
ち金属アルミニウムを15重量％配合した場合でみ
ると、平均粒径が20μm以下では気孔率20％程度
を示すが、平均粒径が40μm以上になると気孔率
は25％以上となり、付着層の緻密性を確保するに
は平均粒径が20μm以下のものを用いなければな
らないことが分る。 Figure 2 shows the porosity of the adhesion layer obtained when no flammable gas is supplied, that is, only by the heat of the oxidation reaction of the easily oxidized substance (metal aluminum powder in this case) with oxygen gas. It is shown in relation to the average particle size of the chemical substance. The blending amount of metallic aluminum powder is as follows for curves A, B, and C, respectively.
This is the case when 10, 15, and 20% by weight are mixed. It is true that the porosity of the adhesion layer decreases as the amount of metallic aluminum powder increases, but for example, looking at curve B, that is, when 15% by weight of metallic aluminum is blended, when the average particle size is 20 μm or less, the porosity is 20%. It can be seen that when the average particle size is 40 μm or more, the porosity is 25% or more, and in order to ensure the denseness of the adhesion layer, it is necessary to use particles with an average particle size of 20 μm or less.
また、第３図は本発明による易被酸化性物質の
平均粒度と気孔率との関係を示すグラフであつ
て、前述同様にアルミナ質耐火粉に金属アルミニ
ウム粉を用い、その平均粒度を変化させた場合と
気孔率の関係を示す。グラフ中曲線Ｄ，Ｅ，Ｆは
金属アルミニウム粉を10重量％配分したもので、
酸化反応当量分の酸素ガス供給比率を6.0とし、
プロパンガスによる供給熱量を耐火材１Kg当りそ
れぞれ2000，3000，4000，5000，6000kcalにした
場合を示す。可燃ガスによる供給熱量が
4000kcal／Kgまでは緻密性も増大するが、
5000kcal／Kgを越えると緻密性が低下する。これ
はノズル先端部に溶着物が発生し、フレームの乱
れが起こるためである。また、金属粉の平均粒径
が160μm以上になると緻密性は大きく劣化する。 Moreover, FIG. 3 is a graph showing the relationship between the average particle size and porosity of the easily oxidizable substance according to the present invention, and shows the relationship between the average particle size and the porosity of the easily oxidizable substance. The relationship between porosity and porosity is shown below. Curves D, E, and F in the graph are those in which 10% by weight of metallic aluminum powder is distributed.
The oxygen gas supply ratio for the oxidation reaction equivalent is set to 6.0,
This shows the case where the amount of heat supplied by propane gas is 2000, 3000, 4000, 5000, and 6000 kcal per 1 kg of refractory material, respectively. The amount of heat supplied by combustible gas is
Denseness also increases up to 4000kcal/Kg,
If it exceeds 5000kcal/Kg, the density will decrease. This is because deposits are generated at the nozzle tip and the frame is disturbed. Furthermore, when the average particle size of the metal powder becomes 160 μm or more, the compactness deteriorates significantly.
このような関係については、ここに示した金属
アルミニウム粉以外の場合においても、例えば金
属シリコン粉を珪石質耐火材と共に吹付けたと
き、あるいは金属アルミニウム粉と金属シリコン
粉の混合物をムライト質耐火材と共に吹付けた場
合、同様なものが得られた。 This relationship also applies to cases other than the metal aluminum powder shown here, such as when metal silicon powder is sprayed together with silica refractory material, or when a mixture of metal aluminum powder and metal silicon powder is sprayed onto mullite refractory material. When sprayed together, similar results were obtained.
その他に、本発明で易被酸化性物質について好
結果を得たものとしては、Mg，Mn，FeMn，
SiMn，CaSi，FeSi，FeCr，CaC2，CaAl，
MgAlなどがあり、これらの一種もしくは数種の
物質を含むものであつた。 In addition, in the present invention, good results were obtained for easily oxidizable substances such as Mg, Mn, FeMn,
SiMn, CaSi, FeSi, FeCr, CaC 2 , CaAl,
MgAl, etc., and contained one or more of these substances.
また、このときの耐火材料としては、シリカ、
アルミナ、ムライトの他に、シヤモツト系、ジル
コン、ジルコニア、マグネシア、マグクロなど
で、この場合に付着層の目標組成に合わせて易被
酸化性物質を配合することにより目的を達成する
ことができる。 In addition, the fireproof materials used at this time include silica,
In addition to alumina and mullite, the purpose can be achieved by blending easily oxidizable substances in accordance with the target composition of the adhesion layer, such as siyamoto, zircon, zirconia, magnesia, and maguro.
また、以上の方法において、可燃性ガスを混入
する機構は、易被酸化性物質の着火および燃焼性
を向上したり、また耐火性物質の加熱を行い付着
層の性状を良好にするばかりではなく、吹付け材
吐出前に、可燃性ガスだけを吐出し、酸素との燃
焼火炎を形成し、基体の補修部およびその周辺を
徐々に加熱することができる。このように加熱を
施すことによつて、吹付けの際に急激に、かつ大
量の熱が基体に噴出されることによる基体の熱的
スポーリング損傷を防止することができる。さら
にこのように加熱された基体の表面は、その直後
に開始される耐火材吹付けの接着性を大いに有利
にする。 In addition, in the above method, the mechanism of mixing flammable gas not only improves the ignition and flammability of easily oxidizable substances, but also improves the properties of the deposited layer by heating the refractory substances. Before discharging the spray material, only the flammable gas is discharged to form a combustion flame with oxygen, thereby gradually heating the repaired portion of the substrate and its surroundings. By applying heating in this manner, it is possible to prevent thermal spalling damage to the substrate due to sudden and large amounts of heat ejected to the substrate during spraying. Furthermore, the surface of the substrate heated in this way greatly facilitates the adhesion of the refractory spraying that is immediately started.
次に同機構は吹付け補修が終了した時点で、補
修部を徐々に冷却する方法も行うことができるた
めに、補修後の急冷によるスポーリング損傷を防
止することもできる。 Next, the same mechanism can also perform a method of gradually cooling the repaired area once the spray repair is completed, so it is also possible to prevent spalling damage due to rapid cooling after the repair.
可燃性ガスとしてプロパンの他にアセチレン、
プロピレン、ブタン等通常工業的に使用されてい
る可燃性ガスを用いても同様の好成果が得られて
おり、安全性、コスト、燃焼性などの観点から、
種々の条件に合わせてこれらを使用することがで
きる。 In addition to propane, acetylene,
Similar good results have been obtained using combustible gases commonly used industrially such as propylene and butane, and from the viewpoints of safety, cost, and combustibility,
These can be used according to various conditions.
可燃性ガスの供給は、搬送ガス経路中のどこで
もよく、安全性、操作性からランス手前が好まし
い。 The flammable gas may be supplied anywhere in the carrier gas path, preferably before the lance in terms of safety and operability.
また、搬送ガス自体に可燃性ガスを用いること
も可能である。 It is also possible to use a flammable gas as the carrier gas itself.
〔実施例〕
実施例 １
本発明法を用いて100t溶鋼取鍋の炉底部、特に
受鋼湯当り部れんが（高アルミミナ質）の損傷部
に、次の混合物を毎時60Kgを酸素噴流中に吐出し
て吹付け補修した。[Example] Example 1 Using the method of the present invention, 60 kg of the following mixture was discharged per hour into an oxygen jet at the bottom of a 100-ton molten steel ladle, especially at the damaged part of the brick (high alumina) in the receiving area. It was repaired by spraying.
混合物は、
最大粒径が160μmで平均粒径が100μmのアル
ミニウムの粒子、
最大粒径が1000μmのアルミナ質耐火材粒で、
Al2O3：87重量％
他SiO2，CaO，Fe2O3
から成る耐火性粒子、
の二者を重量比で：＝15：85に混合した。ま
た補修部はあらかじめC3H8の火炎により1400℃
程度に予熱した。 The mixture consists of aluminum particles with a maximum particle size of 160 μm and an average particle size of 100 μm, alumina refractory material particles with a maximum particle size of 1000 μm, Al 2 O 3 : 87% by weight, and other SiO 2 , CaO, Fe 2 O 3 Fire-resistant particles consisting of were mixed in a weight ratio of 15:85. In addition, the repaired area was heated to 1400 ℃ using a C3H8 flame.
It was preheated to a certain degree.
N2ガスで上記吹付け材混合物を搬送する配管
内に、C3H8を毎時5.0Nm3すなわち、同時に噴出
した吹付け材混合物中の耐火性粒子１Kg当り
2425kcalの燃焼熱量に当るC3H8を混入し、支燃
性ガスとして酸素をランスノズルの先端から毎時
70Nm3、すなわち混入したC3H8の理論燃焼当量
分、および供給吹付け材混合物中アルミニウム粉
の理論燃焼当量分の６倍分を噴出して上記吹付け
補修を20分間行つた。その結果、基体および付着
層の熱的なスポーリング損傷もなく、付着層の基
体への接着性はもちろん付着層自身の緻密性も良
好であつた。 Into the piping conveying the above spray material mixture with N 2 gas, 5.0 Nm 3 of C 3 H 8 per hour, i.e. per 1 kg of refractory particles in the spray material mixture simultaneously ejected.
C 3 H 8 equivalent to 2425 kcal of combustion heat is mixed in, and oxygen is added as a combustion-supporting gas from the tip of the lance nozzle every hour.
The above spray repair was carried out for 20 minutes by injecting 70 Nm 3 , that is, the theoretical combustion equivalent of the mixed C 3 H 8 and 6 times the theoretical combustion equivalent of the aluminum powder in the supplied spray material mixture. As a result, there was no thermal spalling damage to the substrate and the adhesive layer, and not only the adhesion of the adhesive layer to the substrate but also the denseness of the adhesive layer itself were good.
実施例 ２
前記実施例１と同様の溶鋼取鍋炉底部溶鋼湯当
り部れんが損傷箇所を、同実施例１と同様の吹付
け材混合物を用いて補修を実施した。補修部はあ
らかじめC3H8の火炎で約1400℃に加熱し、続い
てC3H8ガスを毎時5.0Nm3（すなわち、同時に噴
出する吹付け材混合物中の耐火性粒子１Kg当り
2425kcalの燃焼熱量に相当するC3H8）で吹付け
材混合物を搬送し、支燃性ガスとして酸素ガスを
ランスノズルの先端から毎時70Nm3を噴出した中
に吹付け材噴流を吐出して、約20分間の溶射補修
施工を行つた。その結果、実施例１と同様、熱的
スポーリング損傷もなく、付着層の接着性、緻密
性も良好であつた。吹付け補修終了後は、吹付け
材供給タンク内のC3H8をN2ガスで十分に置換
し、安全の確保に努めた。Example 2 The same spraying material mixture as in Example 1 was used to repair the damaged area of the brick in the molten steel contact area at the bottom of the molten steel ladle furnace as in Example 1. The repaired area was preheated to approximately 1400 °C with a C 3 H 8 flame and then C 3 H 8 gas was applied at 5.0 Nm 3 per hour (i.e. per kg of refractory particles in the spraying material mixture simultaneously ejected).
The spraying material mixture was conveyed with C 3 H 8 ) corresponding to the combustion heat of 2425 kcal, and the spraying material jet was discharged into a combustion-supporting gas in which oxygen gas was ejected at 70Nm 3 per hour from the tip of the lance nozzle. Thermal spray repair work was carried out for approximately 20 minutes. As a result, as in Example 1, there was no thermal spalling damage, and the adhesion and denseness of the adhesion layer were good. After spraying repairs were completed, the C 3 H 8 in the spray material supply tank was sufficiently replaced with N 2 gas in an effort to ensure safety.
窯炉あるいは金属溶湯用炉の内張り耐火物の損
傷部を本発明による火炎溶射法によつて補修する
ことにより、その基体材質に近い組成で、しかも
基体への接着および付着層の緻密性において優れ
た補修層の形成が可能となり、各種炉の内張り耐
火物の耐用性を大幅に向上することができる。
By repairing the damaged part of the refractory lining of a kiln or molten metal furnace using the flame spraying method according to the present invention, it is possible to repair a damaged part of the refractory lining of a kiln or molten metal furnace using the flame spraying method of the present invention. This makes it possible to form a repair layer, which greatly improves the durability of the refractory linings of various furnaces.
このことにより耐火物原単位および原単価の低
減に大いに寄与する。また操業安定への寄与も大
きい。 This greatly contributes to reducing the unit consumption and unit price of refractories. It also greatly contributes to operational stability.
粒径の大きい易被酸化性物質を使用することが
可能になつたことにより、捕修作業に関する安全
の向上が図られ、作業性が向上し、さらにコスト
を低減されたことにより同捕修方法の利用範囲も
拡大される。 By making it possible to use easily oxidizable substances with large particle sizes, the safety of the remediation work has been improved, workability has been improved, and the cost has been reduced, which has improved the remediation method. The scope of use will also be expanded.
第１図は易被酸化性物質酸化反応当量分の支燃
性ガス比率と付着層の気孔率の関係を示すグラ
フ、第２図は可燃性ガスを供給しないで支燃性ガ
スだけを供給した場合の易被酸化性物質の平均粒
径と気孔率の関係を示すグラフ、第３図は易被酸
化性物質の平均粒径と可燃性ガス供給量の影響を
示すグラフである。
Figure 1 is a graph showing the relationship between the ratio of combustion-supporting gas equivalent to the oxidation reaction equivalent of easily oxidizable substances and the porosity of the deposited layer, and Figure 2 is a graph showing the relationship between the porosity of the adhesion layer and the ratio of combustion-supporting gas equivalent to the oxidation reaction equivalent of easily oxidizable substances. FIG. 3 is a graph showing the relationship between the average particle size of the easily oxidizable substance and the porosity in the case of the oxidizable substance, and FIG. 3 is a graph showing the influence of the average particle size of the easily oxidizable substance and the amount of combustible gas supplied.
Claims (1)
の易被酸化性金属または半金属の粒子の１種以上
と耐火性酸化物粒子とからなる混合耐火材料を不
活性ガスおよび可燃性ガスの混合ガスまたは可燃
性ガスと共に支燃性ガス気流中に噴出し溶射して
耐火物を補修する方法において、 前記供給可燃性ガスの理論燃焼当量と前記供給
易被酸化性金属または半金属の理論酸化反応当量
の３倍以上の量との合計量の支燃性ガスを供給す
ることを特徴とする耐火物の火炎溶射補修方法。 ２ 可燃性ガスとして前記混合耐火材料の耐火性
酸化物粒子１Kg当り5000Kcal以下の発熱量を有
するガスを供給することを特徴とする特許請求の
範囲第１項に記載の火炎溶射補修方法。[Claims] 1. A mixed refractory material consisting of one or more types of easily oxidizable metal or metalloid particles of 50 μm or more and refractory oxide particles that burn to form a refractory oxide is heated with an inert gas. and a method of repairing a refractory by spraying a mixed gas of flammable gas or a combustion-supporting gas together with a combustible gas into an air stream, the theoretical combustion equivalent of the supplied combustible gas and the easily supplied oxidizable metal or 1. A flame spray repair method for refractories, characterized by supplying a total amount of combustion-supporting gas including an amount that is three times or more the theoretical oxidation reaction equivalent of a metalloid. 2. The flame spray repair method according to claim 1, characterized in that a gas having a calorific value of 5000 Kcal or less per 1 kg of refractory oxide particles of the mixed refractory material is supplied as the combustible gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62122692A JPS63267886A (en) | 1986-12-22 | 1987-05-21 | Flame spraying repair method of refractory |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30600386 | 1986-12-22 | ||
| JP61-306003 | 1986-12-22 | ||
| JP62122692A JPS63267886A (en) | 1986-12-22 | 1987-05-21 | Flame spraying repair method of refractory |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63267886A JPS63267886A (en) | 1988-11-04 |
| JPH0245110B2 true JPH0245110B2 (en) | 1990-10-08 |
Family
ID=26459775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62122692A Granted JPS63267886A (en) | 1986-12-22 | 1987-05-21 | Flame spraying repair method of refractory |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63267886A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006056993A (en) * | 2004-08-19 | 2006-03-02 | Kansai Coke & Chem Co Ltd | Smoothening of material repaired by thermal spraying |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4946364A (en) * | 1972-09-06 | 1974-05-02 |
-
1987
- 1987-05-21 JP JP62122692A patent/JPS63267886A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4946364A (en) * | 1972-09-06 | 1974-05-02 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006056993A (en) * | 2004-08-19 | 2006-03-02 | Kansai Coke & Chem Co Ltd | Smoothening of material repaired by thermal spraying |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63267886A (en) | 1988-11-04 |
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