JPS6248797B2 - - Google Patents
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- Publication number
- JPS6248797B2 JPS6248797B2 JP3461583A JP3461583A JPS6248797B2 JP S6248797 B2 JPS6248797 B2 JP S6248797B2 JP 3461583 A JP3461583 A JP 3461583A JP 3461583 A JP3461583 A JP 3461583A JP S6248797 B2 JPS6248797 B2 JP S6248797B2
- Authority
- JP
- Japan
- Prior art keywords
- repair
- weight
- agent
- repair agent
- adhesive
- 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
- 239000003795 chemical substances by application Substances 0.000 claims description 76
- 230000008439 repair process Effects 0.000 claims description 73
- 239000000843 powder Substances 0.000 claims description 25
- 230000001070 adhesive effect Effects 0.000 claims description 24
- 239000000853 adhesive Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 13
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims 1
- 239000003063 flame retardant Substances 0.000 claims 1
- 239000000155 melt Substances 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 29
- 239000011449 brick Substances 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000000377 silicon dioxide Substances 0.000 description 10
- 239000004576 sand Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000003365 glass fiber Substances 0.000 description 5
- 239000004115 Sodium Silicate Substances 0.000 description 4
- 239000004927 clay Substances 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- 238000004079 fireproofing Methods 0.000 description 4
- 239000011490 mineral wool Substances 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910052911 sodium silicate Inorganic materials 0.000 description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- 239000004034 viscosity adjusting agent Substances 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 3
- 230000008602 contraction Effects 0.000 description 3
- 239000012784 inorganic fiber Substances 0.000 description 3
- 229920000609 methyl cellulose Polymers 0.000 description 3
- 239000001923 methylcellulose Substances 0.000 description 3
- 235000010981 methylcellulose Nutrition 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000010455 vermiculite Substances 0.000 description 3
- 229910052902 vermiculite Inorganic materials 0.000 description 3
- 235000019354 vermiculite Nutrition 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 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
- 239000010425 asbestos Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- 239000004156 Azodicarbonamide Substances 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229920000084 Gum arabic Polymers 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004111 Potassium silicate Substances 0.000 description 1
- 241000978776 Senegalia senegal Species 0.000 description 1
- 239000000205 acacia gum Substances 0.000 description 1
- 235000010489 acacia gum Nutrition 0.000 description 1
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 1
- 235000019399 azodicarbonamide Nutrition 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 230000001404 mediated effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000012254 powdered material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 229940005550 sodium alginate Drugs 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
この発明は耐火物で構築された工業用炉、例え
ば高炉、熱風炉、コークス炉、転炉その他の各種
工業用炉の補修方法に関するものである。
周知の様に工業用炉は内張煉瓦自体の耐用度
と、補修剤により寿命が大きく影響される。
従来、工業用炉の補修としてはレンガの目地も
れや煉瓦の欠損部等に粉末耐火物を吹き付ける方
法があり、特公昭55−46998号公報、特公昭56−
5713号公報、特公報56−15763号公報で示す様に
乾式法と湿式法とがある。
上記いずれの方法も加圧タンクから供給される
補修剤を炉壁にガン又はノズルを使用して吹き付
けて行う。しかし上記したどの方法も水分添加量
が多いので炉壁に付着した補修剤が固化する時、
高温な炉壁面側から水蒸気が発生して内圧を受
け、この内圧による補修剤が炉壁から剥離し易く
なり、クラツクが発生することになつて補修寿命
が短期で、頻繁に補修作業を行わなければならな
い。また補修後において炉の使用により補修剤が
加熱されると収縮し、補修部分に微細な隙間が生
じる。
更に加熱時に収縮によつて生じた微細な隙間に
炉内のガスが入り込んで残存し、冷却されたとき
に凝縮する。この現象が繰り返されると隙間が次
第に拡大し、補修剤の剥離を助長することにな
る。
本発明は上記に鑑み提案されたもので、含有水
分が少ない補修剤を使用して高温時の接着性を向
上させ、かつ高温時に膨脹させて補修部分を確実
に閉塞するようにしたものである。
以下本発明を詳細に説明すると、本発明の方法
で使用する補修剤は加熱されると発泡して体積が
膨脹する膨脹剤と、接着剤と、耐火剤と、クラツ
ク防止や初期接着向上を目的とした添加剤とを混
合した粉粒状物である。
上記した補修剤を使用して炉内を補修するに
は、加圧タンクと、該加圧タンクに連結されたノ
ズル若しくは吹付ガンを有する補修装置に上記粉
粒状補修剤を収納し、加圧タンクから圧送される
補修剤にノズル等の先端部分で水を供給しながら
炉内部に貼設してある煉瓦の目地もれ部分、煉瓦
の欠損部分に吹き付ける。
またあらかじめ粉粒状補修剤に水を加えてモル
タル状にし、この液状補修剤を炉の補修部分に吹
き付けたり、鏝などで塗着するようにしてもよ
い。
次に上記した補修剤の各成分に付いて説明する
と、膨脹剤としては加熱されたとき発泡して体積
膨脹するようなものであればどのようなものでも
使用することができ、無機質系と有機質系とがあ
る。無機質系膨脹剤としてはバーミキユライト原
石粉末、真珠岩粉末などであり、また有機質系膨
脹剤としてはジニトロソペンタメチレンテトラミ
ン、アゾジカルボンアミド、パラトルエンスルフ
オニルヒドラジツド等の粉状物で、１〜30重量％
混合するのが好ましい。１重量％以下では加熱時
の膨脹効果が望めないし、30重量％以上では他の
成分の混合率が少なくなる。
一方、前記した接着剤としてはフリツト粉末、
アルカリ硅酸塩粉末などを使用することができ、
３〜50重量％混合するのが好ましい。
上記した接着剤の成分中、フリツトは一般に陶
磁器やホウロウのウワグスリとして使用され、
500〜1000℃の範囲で加熱すると軟化し、均一な
溶融状態となる。このフリツトの成分としては鉛
系、硼酸系、バリウム系、ナトリウム系のものが
あり、補修剤の一成分として使用する場合には加
熱溶解して冷却硬化後、微細な粉末状にするとよ
い。このフリツトは広義のガラスであつて融点が
なく、広い温度範囲で軟化して粘着力が生じる。
したがつて軟化点が適切なフリツトを使用すれば
本発明における方法の補修剤の一成分となる。
またアルカリ硅酸塩としては硅酸ソーダ、硅酸
カリウム等を用いることができ、これらは上記フ
リツトとほゞ同様に加熱すると軟化して粘着力が
生じるので、本発明の方法における接着剤として
効果的に使用することができる。
接着剤としてのアルカリ硅酸塩は加熱により体
積膨脹するので、接着剤としての機能と膨脹剤と
しての機能を兼ねることになる。したがつてアル
カリ硅酸塩を使用する場合には膨脹剤の添加を少
くしたり、或いは不用とすることができる。
上記した接着剤の混合率を３〜50重量％とした
のは、３重量％以下では接着性に乏しく、50重量
％以上では軟化時に溶融して炉壁に吹き付けたと
き垂れ落ちて補修部分を確実に補修できないこと
があるからである。
また前記した耐火剤としては無機耐熱性微粉末
を使用することができ、例えばタルク粉末、マグ
ネシア粉末、ジルコン粉末、クレー粉末、炭化硅
素粉末、アルミナ粉末、シリカ粉末、硅砂などで
あつて、20〜90重量％混合すればよい。この耐火
剤は補修剤の肉盛量を大きくするため、接着剤の
使用温度範囲（接着温度範囲）を大きくするた
め、及び補修作業を良好にするため混合するもの
で、20重量％以下では肉盛量が不足し、90重量％
以上では多過ぎて加熱時の接着剤の接着効果が低
下する。この耐火剤は粒径が細かいと補修時にお
いてノズルの先端で水と混合したとき詰ることが
あるので、粒径1.5〜2.0mm程度のものが20〜60重
量％含有しているのが好ましい。
更に補修剤に混合する添加剤としては無機質系
繊維からなるクラツク防止剤、初期接着向上剤な
どで、0.5〜10重量％混合すればよい。特に無機
質系繊維のクラツク防止剤は工業用炉の稼動中に
高温となつた補修剤が膨脹、収縮する場合に順応
させるため、補修剤が膨脹、収縮することにより
亀裂が発生するのを防止するため、及び振動によ
るひび割れや亀裂、クラツク等が発生するのを防
止するため、粉体組成物を相互分散させるととも
に加熱状態で垂れ落ちるのを防ぐために添加す
る。このようなクラツク防止剤としてはガラス繊
維、石綿、岩綿、鉱滓綿若しくは合成無機質繊維
を微細に切断したものがよい。
本発明で使用する補修剤は上記した各成分を所
望の量だけ含有してなり、この補修剤を利用して
工業用炉の内面を補修するには、工業用炉の稼動
時に行う。即ち、補修装置に上記各成分を十分に
混合した粉粒状補修剤を供給し、加圧タンクによ
り上記補修剤を定量宛圧送させ、ノズル等の先端
部分で水を添加して煉瓦の目地もれ部分、煉瓦の
欠損部分などの補修部分に吹き付ければよい。
又、あらかじめ補修剤に水を加えてモルタル状
にし、この補修剤を炉内の補修部分に吹き付けた
り、鏝で塗着することができる。この場合、粉粒
状補修剤に対して水を10〜40重量％添加し、十分
に混合すればよい。そしてあらかじめ粉粒状補修
剤を水と混合してモルタル状にするとき、粉粒状
補修剤に粘度調整剤をあらかじめ混合するか、又
は混合時に粘度調整剤を水に添加することができ
る。この粘度調整剤はモルタル状となつた補修剤
の粘度を調整するもので、樹脂エマルジヨン、メ
チルセルローズ、アラビアゴム、アルギン酸ソー
ダ等の水溶性糊料を使用することができ、水に対
して0.5〜20重量％の範囲で添加するのが望まし
い。
上記した粘度調整剤のうちメチルセルローズや
カルボキシルメチルセルローズ等のように加熱時
に分解して炭酸ガスや水蒸気を発生するものは、
膨脹剤の添加を軽減することができる。
上記のようにして炉内面の補修部分に吹き付け
られた補修剤は炉内の高温により直ちに水分が蒸
発するとともに接着剤が軟化し、内部に含有する
粉粒状物が相互に作用しながら補修部分に強固に
付着し、垂れ落ちたり剥離することがない。そし
て膨脹剤は加熱により発泡して体積膨脹するの
で、補修部分に充満状となつたり、膨脹剤の体積
膨脹により空隙部を充填することができる。した
がつて膨脹剤により補修後の補修部分はひび割れ
や亀裂が生じ難いし、剥離し難い。
したがつて本発明によれば長期間有効となつて
補修寿命が著しく長くなり、従来のように数週間
から３ケ月程度の寿命であつたのに比較して数倍
の効果が有り、補修回数が少くなるばかりでなく
炉壁に長期間ひび割れや亀裂が生じないので熱エ
ネルギーの浪費がない。
また従来では補修剤の接着力が弱いので補修す
ることにより健全な煉瓦まで剥離し、欠損部分が
拡大することになつていたが、本発明によれば高
温時でも接着力が高いので欠損部に直ちに吹付補
修することができ、また健全な煉瓦が剥離しない
ので欠損部をモルタルなどで修理する必要もな
く、また健全な煉瓦を損傷しないので炉の寿命が
十分に長くなる。しかも炉の稼動中に補修するこ
とができるので従来のように炉の稼動を停止して
冷却することがなく、炉の稼動停止による稼動損
失、熱エネルギーの損失等を防ぐことができる。
以下に本発明の実施例を説明する。
本発明の補修剤(1)
硅酸ソーダ（３号粉末） 15 重量％
無鉛系フリツト（軟化温度770℃）（日本フリツ
ト株式会社製XM―233） ５ 重量％
３号硅砂 10 重量％
５号硅砂 30 重量％
クレー粉末 27 重量％
岩綿 11 重量％
ガラス繊維 0.5重量％
メチルセルローズ 1.5重量％
本発明の補修剤(2)
ジニトロソペンタメチレンテトラミン
３ 重量％
フリツト（軟化温度590℃）（日本フリツト株式
会社製PN―5400） 20 重量％
３号硅砂 10 重量％
８号硅砂 45 重量％
クレー粉末 16 重量％
ガラス繊維 １ 重量％
石綿 ５ 重量％
本発明の補修剤(3)
バーミキユライト原石粉末 15 重量％
硅酸ソーダ（３号粉末） 20 重量％
タルク 25 重量％
炭化硅素 40 重量％
本発明の補修剤(4)
真珠岩粉末 30 重量％
フリツト（軟化温度770℃）（日本フリツト株式
会社製XM―233） 7.5重量％
アルミナ粉末 10 重量％
３号硅砂 22.5重量％
５号硅砂 25 重量％
ガラス繊維 0.5重量％
鉱滓綿 4.5重量％
本発明の補修剤(5)
バーミキユライト原石粉末 10 重量％
フリツト（軟化温度770℃）（日本フリツト株式
会社製XM―233） 2.5重量％
硅酸ソーダ（３号粉末） 2.5重量％
炭化硅素 20 重量％
タルク 20 重量％
４号硅砂 20 重量％
６号硅砂 15 重量％
ガラス繊維 １ 重量％
岩綿 ９重量％
比較例の補修剤(1)
市販の高アルミナ質系補修剤
Al2O355〜60部 SiO240〜45部
Fe2O30.8〜1.2部
比較例の補修剤(2)
市販の粘土質系補修剤
Al2O342〜45部 SiO252〜55部
Fe2O31.0〜1.2部
実施例 １
図面で示すように左右のシヤモツト煉瓦１，１
の間に他のシヤモツト煉瓦２を上方に位置させ、
各煉瓦１，２間に厚さ５mmのモルタル状補修剤３
を介在させた。モルタル状補修剤３は補修剤と水
とが重量比で５対１で、本発明の５種類の補修剤
と、比較例の２種類の補修剤とを別個に作成し
た。作成後24時間室温で放置して硬化接着させた
後、加熱炉において1150℃で５時間加熱し、その
後室温まで冷却した。その後万能試験機により図
面矢印で示すように中央のシヤモツト煉瓦２に上
方から荷重を加え、補修剤の接着面が破壊したと
きの最高荷重を接着強度とした。
本発明の５種類の補修剤及び比較例の２種類の
補修剤の各接着強度は下記の表のようであつた。
The present invention relates to a method for repairing industrial furnaces constructed of refractories, such as blast furnaces, hot blast furnaces, coke ovens, converters, and other various industrial furnaces. As is well known, the lifespan of industrial furnaces is greatly affected by the durability of the lining brick itself and the repair agent used. Conventionally, the method of repairing industrial furnaces has been to spray powdered refractories on leaking joints and missing parts of bricks, as described in Japanese Patent Publication No. 46998/1983 and Japanese Patent Publication No. 56/1983.
There are a dry method and a wet method, as shown in Publication No. 5713 and Japanese Patent Publication No. 56-15763. Both of the above methods are carried out by spraying a repair agent supplied from a pressurized tank onto the furnace wall using a gun or nozzle. However, all of the above methods require a large amount of water to be added, so when the repair agent that adheres to the furnace wall solidifies,
Steam is generated from the high-temperature furnace wall side and receives internal pressure, and this internal pressure causes the repair agent to easily peel off from the furnace wall, resulting in cracks, which shortens the repair life and requires frequent repair work. Must be. Furthermore, when the repair agent is heated by using a furnace after repair, it contracts, creating minute gaps in the repaired area. Further, the gas in the furnace enters and remains in the minute gaps created by contraction during heating, and condenses when cooled. If this phenomenon is repeated, the gap will gradually expand, which will encourage the repair agent to peel off. The present invention was proposed in view of the above, and uses a repair agent with low water content to improve adhesive properties at high temperatures, and expands at high temperatures to reliably close the repaired area. . To explain the present invention in detail below, the repair agent used in the method of the present invention includes an expansion agent that foams and expands in volume when heated, an adhesive, a fireproofing agent, and the purpose of preventing cracks and improving initial adhesion. This powder is a mixture of additives. In order to repair the inside of the furnace using the above-mentioned repair agent, the above-mentioned granular repair agent is stored in a repair device having a pressurized tank and a nozzle or spray gun connected to the pressurized tank. While supplying water with the tip of a nozzle, the repair agent is sprayed onto leaking joints and missing parts of the bricks installed inside the furnace. Alternatively, water may be added to the granular repair agent in advance to form a mortar, and the liquid repair agent may be sprayed onto the repaired portion of the furnace or applied with a trowel. Next, to explain each component of the above-mentioned repair agent, any expanding agent can be used as long as it foams and expands in volume when heated. There is a system. Inorganic expanding agents include vermiculite raw stone powder, nacre powder, etc., and organic expanding agents include powdered materials such as dinitrosopentamethylenetetramine, azodicarbonamide, and paratoluenesulfonylhydrazide. , 1-30% by weight
Preferably, they are mixed. If it is less than 1% by weight, no expansion effect can be expected during heating, and if it is more than 30% by weight, the mixing ratio of other components will be reduced. On the other hand, as the adhesive mentioned above, frit powder,
Alkaline silicate powder etc. can be used,
It is preferable to mix 3 to 50% by weight. Among the above adhesive components, frit is generally used as a glaze for ceramics and enamel.
When heated in the range of 500 to 1000°C, it softens and becomes a uniform molten state. The components of this frit include lead-based, boric acid-based, barium-based, and sodium-based ones, and when used as a component of a repair agent, it is preferably melted by heating, cooled and hardened, and then made into a fine powder. This frit is glass in the broad sense and has no melting point, so it softens over a wide temperature range and develops adhesive strength.
Therefore, if a frit with a suitable softening point is used, it becomes a component of the repair agent in the method of the present invention. In addition, sodium silicate, potassium silicate, etc. can be used as the alkali silicate, and these soften when heated and develop adhesive strength, similar to the above-mentioned frit, so they are effective as adhesives in the method of the present invention. can be used for. Since the alkali silicate used as an adhesive expands in volume when heated, it functions both as an adhesive and as an expansion agent. Therefore, when using an alkali silicate, the addition of an expanding agent can be reduced or eliminated. The reason why the mixing ratio of the adhesive mentioned above is 3 to 50% by weight is that if it is less than 3% by weight, it will have poor adhesion, and if it is more than 50% by weight, it will melt when softened and drip down when sprayed on the furnace wall, damaging the repaired area. This is because it may not be possible to repair it reliably. Further, as the above-mentioned fireproofing agent, an inorganic heat-resistant fine powder can be used, such as talc powder, magnesia powder, zircon powder, clay powder, silicon carbide powder, alumina powder, silica powder, silica sand, etc. It is sufficient to mix 90% by weight. This fireproofing agent is mixed in order to increase the amount of overlay of the repair agent, to increase the operating temperature range of the adhesive (bonding temperature range), and to improve repair work. Insufficient amount, 90% by weight
If the amount is too large, the adhesive effect of the adhesive during heating will be reduced. If this fireproofing agent has a small particle size, it may clog when mixed with water at the tip of the nozzle during repair, so it is preferable that particles with a particle size of about 1.5 to 2.0 mm contain 20 to 60% by weight. Furthermore, additives to be mixed into the repair agent include crack preventive agents made of inorganic fibers and initial adhesion improvers, which may be mixed in an amount of 0.5 to 10% by weight. In particular, anti-crack agents for inorganic fibers are used to adapt to the expansion and contraction of the repair agent, which reaches high temperatures during operation of industrial furnaces, so it prevents cracks from occurring due to expansion and contraction of the repair agent. It is added to mutually disperse the powder composition and to prevent it from dripping under heating, and to prevent the occurrence of cracks, cracks, cracks, etc. due to vibration. As such a crack preventive agent, glass fiber, asbestos, rock wool, mineral wool, or finely cut synthetic inorganic fibers may be used. The repair agent used in the present invention contains each of the above-mentioned components in desired amounts, and the inner surface of an industrial furnace can be repaired using this repair agent when the industrial furnace is in operation. That is, a granular repair agent containing a sufficient mixture of the above components is supplied to the repair device, and a pressurized tank feeds the repair agent in fixed amounts, and water is added at the tip of a nozzle to prevent leakage from the joints of the bricks. It can be sprayed on repaired areas such as missing parts of bricks. Alternatively, water can be added to the repair agent in advance to form a mortar, and this repair agent can be sprayed or applied with a trowel to the repaired area in the furnace. In this case, 10 to 40% by weight of water may be added to the granular repair agent and mixed thoroughly. When the granular repair agent is mixed with water to form a mortar, the viscosity modifier can be mixed in advance with the granular repair agent, or the viscosity modifier can be added to the water at the time of mixing. This viscosity modifier is used to adjust the viscosity of the mortar-like repair agent, and water-soluble adhesives such as resin emulsion, methyl cellulose, gum arabic, and sodium alginate can be used. It is desirable to add it in a range of 20% by weight. Among the viscosity modifiers mentioned above, those that decompose when heated and generate carbon dioxide gas and water vapor, such as methylcellulose and carboxylmethylcellulose,
The addition of swelling agents can be reduced. The repair agent sprayed onto the repaired area on the inner surface of the furnace as described above immediately evaporates moisture due to the high temperature inside the furnace, softens the adhesive, and causes the particles contained inside to interact with each other to form the repaired area. It adheres strongly and will not drip or peel off. Since the swelling agent foams and expands in volume when heated, it can fill the repaired area and fill voids by expanding the volume of the swelling agent. Therefore, the repaired part after repair with the swelling agent is less likely to crack or crack, and is less likely to peel off. Therefore, according to the present invention, it is effective for a long period of time, and the repair life is significantly extended.Compared to conventional methods, which have a service life of several weeks to three months, the present invention is several times more effective, and the number of repairs can be reduced. Not only does this reduce the amount of heat generated, but there are no cracks or cracks in the furnace wall for a long period of time, so there is no wastage of thermal energy. In addition, in the past, the adhesive force of the repair agent was weak, so when repairing it, even healthy bricks would peel off and the defective area would expand, but with the present invention, the adhesive force is high even at high temperatures, so the defective area can be easily removed. It can be repaired immediately by spraying, and since the healthy bricks do not peel off, there is no need to repair the defective parts with mortar, and since the healthy bricks are not damaged, the life of the furnace is sufficiently extended. Moreover, since repairs can be made while the furnace is in operation, there is no need to stop the furnace to cool it down as in the conventional case, and it is possible to prevent operational losses, thermal energy losses, etc. due to the furnace's shutdown. Examples of the present invention will be described below. Repair agent of the present invention (1) Sodium silicate (No. 3 powder) 15% by weight Lead-free Fritz (softening temperature 770°C) (XM-233 manufactured by Nippon Fritz Co., Ltd.) 5% by weight No. 3 silica sand 10% by weight No. 5 silica sand 30% by weight Clay powder 27% by weight Rock wool 11% by weight Glass fiber 0.5% by weight Methylcellulose 1.5% by weight Repair agent of the present invention (2) Dinitrosopentamethylenetetramine
3% by weight Fritz (softening temperature 590℃) (PN-5400 manufactured by Nippon Fritz Co., Ltd.) 20% by weight No. 3 silica sand 10% by weight No. 8 silica sand 45% by weight Clay powder 16% by weight Glass fiber 1% by weight Asbestos 5% by weight Books Repair agent of the invention (3) Vermiculite raw stone powder 15% by weight Sodium silicate (No. 3 powder) 20% by weight Talc 25% by weight Silicon carbide 40% by weight Repair agent of the invention (4) Pearlite powder 30% by weight Fritz (Softening temperature 770°C) (XM-233 manufactured by Nihon Fritz Co., Ltd.) 7.5% by weight Alumina powder 10% by weight No. 3 silica sand 22.5% by weight No. 5 silica sand 25% by weight Glass fiber 0.5% by weight Mineral cotton 4.5% by weight Repair of the present invention Agent (5) Vermiculite raw stone powder 10% by weight Fritz (softening temperature 770℃) (XM-233 manufactured by Nippon Fritz Co., Ltd.) 2.5% by weight Sodium silicate (No. 3 powder) 2.5% by weight Silicon carbide 20% by weight Talc 20 Weight % No. 4 silica sand 20 weight % No. 6 silica sand 15 weight % Glass fiber 1 weight % Rock wool 9 weight % Comparative example repair agent (1) Commercially available high alumina repair agent Al 2 O 3 55-60 parts SiO 2 40 to 45 parts Fe 2 O 3 0.8 to 1.2 parts Comparative repair agent (2) Commercially available clay repair agent Al 2 O 3 42 to 45 parts SiO 2 52 to 55 parts Fe 2 O 3 1.0 to 1.2 parts Example 1 As shown in the drawing, the left and right shiyamoto bricks 1, 1
In between, place another siyamoto brick 2 above,
Mortar-like repair agent 3 with a thickness of 5 mm between each brick 1 and 2
mediated. Mortar-like repair agent 3 had a weight ratio of repair agent to water of 5:1, and five types of repair agents of the present invention and two types of repair agents of comparative examples were prepared separately. After creation, it was left at room temperature for 24 hours to cure and adhere, then heated in a heating oven at 1150°C for 5 hours, and then cooled to room temperature. Thereafter, a load was applied from above to the center brick 2 as shown by the arrow in the figure using a universal testing machine, and the maximum load at which the adhesive surface of the repair agent broke was defined as the adhesive strength. The adhesive strengths of five types of repair agents of the present invention and two types of repair agents of comparative examples were as shown in the table below.
【表】
実施例 ２
本発明の補修剤(1)、(4)と、比較補修剤(1)、(2)と
をコークス炉内面の煉瓦の目地もれ部分及び欠損
部分に乾式噴付補修方法により補修作業を行い、
耐用期間を測定した。この結果各比較補修剤は１
〜２ケ月で剥離して再度補修作業を行わなければ
ならなかつたが、本発明の補修剤(1)、(4)はいずれ
も６ケ月経過してもほとんど剥落することがな
く、補修寿命が著しく延長された。[Table] Example 2 Repair by dry spraying the repair agents (1) and (4) of the present invention and the comparative repair agents (1) and (2) on the joint leakage and defective portions of bricks on the inner surface of a coke oven. Perform repair work by method,
The service life was measured. As a result, each comparative repair agent is 1
However, the repair agents (1) and (4) of the present invention hardly peel off even after 6 months, and the repair life has been extended. significantly extended.
図面は本発明の実施例１を実施した場合の概略
図である。
The drawings are schematic views of the first embodiment of the present invention.
Claims (1)
なつたとき溶融して接着性を有する接着剤と、耐
火剤と、添加剤とを含有する補修剤を高温状態と
なつている工業用炉内部の補修部分に供給し、接
着剤の軟化により補修剤を補修部分に強固に付着
させるとともに膨脹剤により補修剤を発泡させて
補修部分を閉塞させるようにしたことを特徴とす
る工業用炉の補修方法。 ２ 膨脹剤は無機質系又は有機質系の粉末状であ
る特許請求の範囲第１項記載の工業用炉の補修方
法。 ３ 接着剤はフリツト粉末、アルカリ硅酸塩粉末
の１種以上である特許請求の範囲第１項記載の工
業用炉の補修方法。[Scope of Claims] 1. A repair agent containing an expansion agent that foams when heated to a high temperature, an adhesive that melts and has adhesive properties when heated to a high temperature, a fire retardant, and an additive in a high temperature state. The adhesive is supplied to the repaired area inside an industrial furnace, and the repair agent is softened to firmly adhere to the repaired area, and the repair agent is foamed by an expansion agent to close the repaired area. A method for repairing industrial furnaces. 2. The method for repairing an industrial furnace according to claim 1, wherein the expanding agent is an inorganic or organic powder. 3. The method for repairing an industrial furnace according to claim 1, wherein the adhesive is one or more of frit powder and alkali silicate powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3461583A JPS59161682A (en) | 1983-03-04 | 1983-03-04 | Method of repairing industrial furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3461583A JPS59161682A (en) | 1983-03-04 | 1983-03-04 | Method of repairing industrial furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59161682A JPS59161682A (en) | 1984-09-12 |
| JPS6248797B2 true JPS6248797B2 (en) | 1987-10-15 |
Family
ID=12419276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3461583A Granted JPS59161682A (en) | 1983-03-04 | 1983-03-04 | Method of repairing industrial furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59161682A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6792485B2 (en) * | 2017-02-27 | 2020-11-25 | 黒崎播磨株式会社 | Formulation for mortar, mortar and method for producing mortar |
-
1983
- 1983-03-04 JP JP3461583A patent/JPS59161682A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59161682A (en) | 1984-09-12 |
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