JP2019038884A - Repair method of hearth bricks of coke oven - Google Patents

Repair method of hearth bricks of coke oven Download PDF

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JP2019038884A
JP2019038884A JP2017159926A JP2017159926A JP2019038884A JP 2019038884 A JP2019038884 A JP 2019038884A JP 2017159926 A JP2017159926 A JP 2017159926A JP 2017159926 A JP2017159926 A JP 2017159926A JP 2019038884 A JP2019038884 A JP 2019038884A
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hearth
combustion chamber
coke oven
brick
chamber
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JP6502434B2 (en
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幸裕 隈元
Yukihiro Kumamoto
幸裕 隈元
光剛 長尾
Mitsutake Nagao
光剛 長尾
拓司 上里
Takuji Uesato
拓司 上里
要 高野
Kaname Takano
要 高野
崇基 李
Chung-Ji Lee
崇基 李
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Megatech Corp Japan
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Abstract

To provide a repair method capable of repairing hearth bricks of a coke oven efficiently in a short time.SOLUTION: The repair method comprises: replacing carbonization chamber hearth bricks 7, which form a hearth of a carbonization chamber of the coke oven, with a new one, after disassembling a wall body of a combustion chamber and taking the wall body out of a furnace, grinding and removing a worn portion of combustion chamber hearth bricks 6, which form the hearth of the combustion chamber, to form a grinding recess 8, pouring an unshaped refractory 9 into the grinding recess 8, and pressing a steel round bar 10 or a round steel pipe 10 against a top surface of the unshaped refractory before the unshaped refractory 9 is dried to form a groove part 11.SELECTED DRAWING: Figure 1

Description

本発明は、コークス炉の炉床煉瓦を補修する方法に関するものである。   The present invention relates to a method for repairing a hearth brick of a coke oven.

図２はコークス炉の要部を模式的に示す水平断面図、図３は燃焼室の壁体の例を模式的に示す斜視図、図４は燃焼室の壁体と蓄熱室の配置の例を模式的に示す垂直断面図である。なお、図４中の燃焼室１の壁体３は、図２のＡ−Ａ矢視の断面図として示す。   FIG. 2 is a horizontal sectional view schematically showing the main part of the coke oven, FIG. 3 is a perspective view schematically showing an example of the wall of the combustion chamber, and FIG. 4 is an example of the arrangement of the wall of the combustion chamber and the heat storage chamber. FIG. Note that the wall 3 of the combustion chamber 1 in FIG. 4 is shown as a cross-sectional view taken along the line AA in FIG.

一般にコークス炉は、図２、４に示すように、石炭を乾留する炭化室２、燃料ガスを燃焼させる燃焼室１、燃焼排ガスの余熱を利用して燃料ガスや燃焼用空気を予め加熱する蓄熱室４で構成され、燃焼室１と炭化室２は交互に配置される。つまり図３に示すように、互いに隣接する炭化室２を隔離する耐火煉瓦の壁体３の内部に燃焼室１が形成される。   In general, as shown in FIGS. 2 and 4, the coke oven has a carbonization chamber 2 for dry distillation of coal, a combustion chamber 1 for burning fuel gas, and heat storage for preheating fuel gas and combustion air using the residual heat of combustion exhaust gas. Composed of chambers 4, combustion chambers 1 and carbonization chambers 2 are arranged alternately. That is, as shown in FIG. 3, the combustion chamber 1 is formed inside the wall 3 of the refractory brick that separates the adjacent carbonization chambers 2.

そしてコークス炉の操業中に、炭化室２へ石炭を装入し、さらに燃焼室１で発生する燃焼熱によって乾留した後、得られたコークスを炭化室２から排出する作業が繰り返し行なわれる。その結果、耐火煉瓦で形成される壁体３が損耗し、燃焼室１から燃焼排ガスや未燃焼の燃料ガスが炭化室２内に漏出するという問題が生じる。   During the operation of the coke oven, coal is charged into the carbonization chamber 2 and further subjected to dry distillation by the combustion heat generated in the combustion chamber 1, and then the obtained coke is discharged from the carbonization chamber 2 repeatedly. As a result, the wall 3 formed of refractory bricks is worn out, and there arises a problem that combustion exhaust gas and unburned fuel gas leak out from the combustion chamber 1 into the carbonization chamber 2.

そこで、燃焼室１の壁体３を適宜補修しなければならないが、コークス炉の燃焼室１と炭化室２を全て停止して補修を行なうのはコークスの生産に支障を来たす。したがって、コークス炉を操業しながら、補修の対象となる燃焼室１のみ燃焼を停止して、補修を行なう。その補修工事の手順は、
(A)補修すべき燃焼室１の壁体３と天井を解体して炉外へ搬出し、
その後、
(B)新たに壁体３と天井を構築する
という２段階の工程に大別される。 Therefore, the wall 3 of the combustion chamber 1 must be repaired as appropriate. However, if all the combustion chamber 1 and the carbonization chamber 2 of the coke oven are stopped and repaired, the production of coke will be hindered. Therefore, while operating the coke oven, only the combustion chamber 1 to be repaired is stopped for repair. The repair procedure is as follows:
(A) The wall 3 and ceiling of the combustion chamber 1 to be repaired are dismantled and taken out of the furnace.
after that,
(B) It is roughly divided into a two-stage process of constructing a new wall 3 and ceiling.

そして補修工事において、上記(A)の工程が終了した後、(B)の工程を開始する前に、炭化室２の炉床に配設された炉床煉瓦（以下、炭化室炉床煉瓦という）および燃焼室１の炉床に配設された炉床煉瓦（以下、燃焼室炉床煉瓦という）を点検し、損耗が著しい場合はその炉床煉瓦の補修を行なっている。   In the repair work, after the process (A) is completed, before the process (B) is started, a hearth brick disposed on the hearth of the coking chamber 2 (hereinafter referred to as a coking chamber hearth brick). ) And the hearth brick (hereinafter referred to as the combustion chamber hearth brick) disposed on the hearth of the combustion chamber 1, and if the wear is significant, the hearth brick is repaired.

炉床煉瓦を補修する技術として、特許文献１には、炭化室炉床煉瓦を水平かつ平坦に均す補修技術が開示されている。しかし特許文献１に開示された技術は、燃焼室炉床煉瓦の補修に適用できない。   As a technique for repairing the hearth brick, Patent Document 1 discloses a repair technique for leveling the carbonization chamber hearth brick horizontally and flatly. However, the technique disclosed in Patent Document 1 cannot be applied to repair of a combustion chamber hearth brick.

燃焼室の壁体３を組み立てるための耐火煉瓦５は、図４に示すように、凸型嵌合突起5aおよび凹型嵌合溝5bを有しており、上下あるいは左右に隣り合う耐火煉瓦５の凸型嵌合突起5aと凹型嵌合溝5bを嵌め合わせることによって、構造物としての強度と安定性を高めている。したがって燃焼室炉床煉瓦６には、壁体３の最下段の耐火煉瓦５の凸型嵌合突起5aと嵌め合わせるための凹型嵌合溝5bを設ける必要がある。ところが特許文献１に開示された技術を適用して燃焼室炉床煉瓦６の補修を行なった場合に、水平かつ平坦に均すことは可能であるが、その作業に併行して凹型嵌合溝5bを設けることはできない。作業が終了した後で、別途、工具を用いて燃焼室炉床煉瓦６の上面を削って凹型嵌合溝5bを設けることは可能であるが、長時間を要するので、施工コストが上昇するという問題が生じる。   As shown in FIG. 4, the refractory brick 5 for assembling the wall 3 of the combustion chamber has a convex fitting projection 5a and a concave fitting groove 5b. By fitting the convex fitting protrusion 5a and the concave fitting groove 5b, the strength and stability as a structure are increased. Therefore, it is necessary to provide the combustion chamber hearth brick 6 with a concave fitting groove 5b for fitting with the convex fitting protrusion 5a of the lowermost refractory brick 5 of the wall 3. However, when the technique disclosed in Patent Document 1 is applied and the combustion chamber hearth brick 6 is repaired, it can be leveled horizontally and flatly. 5b cannot be provided. After the work is completed, it is possible to provide the concave fitting groove 5b by separately cutting the upper surface of the combustion chamber hearth brick 6 with a tool, but it takes a long time, so that the construction cost increases. Problems arise.

つまり、炭化室炉床煉瓦および燃焼室炉床煉瓦を短時間で効率良く補修する技術は、未だ確立されていない。   That is, a technique for efficiently repairing the carbonization chamber hearth brick and the combustion chamber hearth brick in a short time has not yet been established.

特開2007-145890号公報JP 2007-145890 JP

本発明は、従来の技術の問題点を解消し、コークス炉の炉床煉瓦（すなわち炭化室炉床煉瓦および燃焼室炉床煉瓦）を短時間で効率良く補修することが可能な補修方法を提供することを目的とする。   The present invention provides a repair method capable of solving the problems of the conventional technology and efficiently repairing a hearth brick of a coke oven (that is, a carbonization chamber hearth brick and a combustion chamber hearth brick) in a short time. The purpose is to do.

本発明者は、炉床煉瓦を効率良く補修するために、不定形耐火物（いわゆるキャスター）を用いて補修する技術について検討した。そして、作業の効率向上の観点から、炭化室炉床煉瓦の補修には不定形耐火物を使用しない方が望ましく、その一方で、燃焼室炉床煉瓦は不定形耐火物を用いて補修しても問題はないし、しかも凹型嵌合溝を容易に設けることが可能であることが判明した。   In order to efficiently repair the hearth brick, the present inventor studied a technique for repairing using an irregular refractory (so-called caster). From the viewpoint of improving work efficiency, it is desirable not to use irregular refractories for repairing the carbonization chamber hearth bricks, while the combustion chamber hearth bricks are repaired using irregular refractories. It has also been found that there is no problem and that it is possible to easily provide the concave fitting groove.

つまり、炭化室の炉床は、コークスを排出する際の摩擦で著しく損耗するので、不定形耐火物を使用して炭化室炉床煉瓦を補修する場合は、多量の不定形耐火物を流し込む必要があり、作業に長時間を要する。したがって、炭化室炉床煉瓦の補修においては、不定形耐火物を使用しない方が良い。   In other words, the hearth of the carbonization chamber is worn out by friction when discharging the coke, so when repairing the carbonization hearth brick using an irregular refractory, a large amount of irregular refractory must be poured. And it takes a long time to work. Therefore, it is better not to use irregular refractories for repairing the carbonization furnace hearth brick.

一方で、燃焼室の炉床は、摩擦は発生せず、燃料ガスの燃焼熱による劣化が損耗の原因であるから、劣化する領域、すなわち補修すべき範囲は限られている。したがって、不定形耐火物を用いて短時間で補修できる。   On the other hand, no friction is generated in the hearth of the combustion chamber, and the deterioration due to the combustion heat of the fuel gas is a cause of wear, so that the deteriorated region, that is, the range to be repaired is limited. Therefore, it can be repaired in a short time using the irregular refractory.

本発明は、このような知見に基づいてなされたものである。
すなわち本発明は、コークス炉の炉床に配設される炉床煉瓦の補修方法において、燃焼室の壁体を解体して炉外へ搬出した後、コークス炉の炭化室の炉床を形成する炭化室炉床煉瓦を新品と交換し、燃焼室の炉床を形成する燃焼室炉床煉瓦の損耗した部位を研削除去して研削窪みを形成し、研削窪みに不定形耐火物を流し込み、不定形耐火物が乾燥する前にその上面に鋼製丸棒または丸鋼管を押し付けて溝部を設けるコークス炉の炉床煉瓦の補修方法である。 The present invention has been made based on such knowledge.
That is, the present invention provides a method for repairing a hearth brick disposed on a hearth of a coke oven, dismantling the wall of the combustion chamber and carrying it out of the furnace, and then forming the hearth of the carbonization chamber of the coke oven. Replace the carbonization chamber hearth brick with a new one, grind and remove the worn part of the combustion chamber hearth brick that forms the hearth of the combustion chamber to form a grinding depression, and pour an irregular refractory into the grinding depression. This is a method for repairing a hearth brick of a coke oven in which a steel round bar or a round steel pipe is pressed on the upper surface of a fixed refractory to provide a groove.

本発明によれば、コークス炉の炉床煉瓦を短時間で効率良く補修することができるので、産業上格段の効果を奏する。   According to the present invention, since the hearth brick of the coke oven can be repaired efficiently in a short time, there is a remarkable industrial effect.

本発明を適用して炉床煉瓦を補修する手順を模式的に示す垂直断面図である。It is a vertical sectional view which shows typically the procedure which repairs a hearth brick by applying the present invention. コークス炉の要部を模式的に示す水平断面図である。It is a horizontal sectional view which shows typically the principal part of a coke oven. 図２の壁体の例を模式的に示す斜視図である。It is a perspective view which shows the example of the wall body of FIG. 2 typically. 図２の壁体と蓄熱室の配置の例コークス例を模式的に示す垂直断面図である。FIG. 3 is a vertical sectional view schematically showing an example of coke in the arrangement of the wall body and the heat storage chamber in FIG. 2.

図１は、本発明を適用して炉床煉瓦を補修する手順を模式的に示す垂直断面図である。図１(a)は、図４に示す健全な燃焼室炉床煉瓦６と炭化室炉床煉瓦７がコークス炉の操業によって損耗した状態で、壁体３を解体して炉外へ搬出（上記(A)の工程）した例を示す。   FIG. 1 is a vertical sectional view schematically showing a procedure for repairing a hearth brick by applying the present invention. FIG. 1 (a) shows a state in which the healthy combustion chamber hearth brick 6 and the carbonization chamber hearth brick 7 shown in FIG. 4 are worn out by the operation of the coke oven, and the wall body 3 is disassembled and carried out of the furnace (above) (A) step) is shown.

図１(a)に示す炉床煉瓦を補修するにあたって、図１(b)に示すように、損耗した炭化室炉床煉瓦７を炉外へ搬出して新品と交換する。その新品は、無膨張煉瓦製の炭化室炉床煉瓦７を使用する。無膨張煉瓦は熱による寸法変化が抑えられるので、新品の炭化室炉床煉瓦７を所定の位置に素早く組み込むことができる。   In repairing the hearth brick shown in FIG. 1 (a), as shown in FIG. 1 (b), the worn carbonization chamber hearth brick 7 is taken out of the furnace and replaced with a new one. The new article uses a carbonization chamber hearth brick 7 made of non-expandable brick. Since the non-expandable brick can be prevented from changing in size due to heat, a new carbonization chamber hearth brick 7 can be quickly incorporated into a predetermined position.

次に、燃焼室炉床煉瓦６の損耗した部位を研削除去して、研削窪み８を形成する（図１(b)参照）。研削窪み８を形成するための工具は、特に限定せず、従来から知られている工具（たとえば回転研磨工具等）が使用できる。   Next, the worn portion of the combustion chamber hearth brick 6 is removed by grinding to form a grinding recess 8 (see FIG. 1 (b)). The tool for forming the grinding recess 8 is not particularly limited, and a conventionally known tool (for example, a rotary polishing tool or the like) can be used.

そして、図１(c)に示すように、研削窪み８に不定形耐火物９を流し込む。不定形耐火物９の成分は、アルミナ：62質量％以上、シリカ：33質量％以上であり、かつ固形物粒子の粒度分布は、粒径3.35mm超え：9.5質量％、粒径3.35〜0.15mm：51.5質量％、粒径0.15mm未満：39.0質量％であることが好ましい。その理由は、流し込むときの流動性、および、乾燥した後の強度を確保できるからである。   Then, as shown in FIG. 1 (c), the amorphous refractory 9 is poured into the grinding recess 8. The components of the amorphous refractory 9 are alumina: 62% by mass or more, silica: 33% by mass or more, and the particle size distribution of solid particles exceeds 3.35 mm: 9.5% by mass, 3.35 to 0.15 mm : 51.5% by mass, particle size less than 0.15 mm: 39.0% by mass is preferable. The reason is that the fluidity when pouring and the strength after drying can be secured.

引き続き、不定形耐火物９が乾燥する前に、その上面に丸鋼管10を埋没しないように押し付けた後（図１(c)参照）、丸鋼管10を取り除く。このようにして、図１(d)に示すような溝部11を設けることができる。この溝部11は、上記(B)の工程において、凹型嵌合溝5bとして機能する。図１(c)に示すような丸鋼管10を用いる代わりに、中実の鋼製丸棒を用いて溝部11（図１(d)参照）を設けることも可能である。   Subsequently, before the amorphous refractory 9 is dried, the round steel pipe 10 is pressed on the upper surface so as not to be buried (see FIG. 1 (c)), and then the round steel pipe 10 is removed. In this way, the groove 11 as shown in FIG. 1 (d) can be provided. The groove 11 functions as the concave fitting groove 5b in the step (B). Instead of using the round steel pipe 10 as shown in FIG. 1 (c), it is also possible to provide the groove 11 (see FIG. 1 (d)) using a solid steel round bar.

なお図１(a)〜(d)には、互いに隣り合う２つの燃焼室を解体して補修する例を示したが、燃焼室を１つだけ解体（たとえば図４中の右側の燃焼室のみ解体）して補修する場合にも、本発明を適用して燃焼室炉床煉瓦と炭化室炉床煉瓦を補修することは可能である。   1A to 1D show an example in which two adjacent combustion chambers are disassembled and repaired, but only one combustion chamber is disassembled (for example, only the right combustion chamber in FIG. 4 is disassembled). Even in the case of repair by dismantling, it is possible to repair the combustion chamber hearth brick and the carbonization chamber hearth brick by applying the present invention.

コークス炉（炉高６ｍ、炉長34フリュー）の互いに隣り合う燃焼室の壁体と天井を全て解体して炉外へ搬出（上記(A)の工程）した後、燃焼室炉床煉瓦と炭化室炉床煉瓦の補修を、図１に示す本発明の手順で行なった。炭化室の炉床の補修のために使用した新品の炭化室炉床煉瓦は、無膨張煉瓦で製作した。燃焼室の炉床の補修のために使用した不定形耐火物の組成は、アルミナが62質量％、シリカが33質量％、酸化カルシウムが５質量％以下であり、また、不定形耐火物の固形物粒子の粒度分布は、粒径3.35mm超えの粒子が9.5質量％、粒径3.35〜0.15mmの粒子が51.5質量％、粒径0.15mm未満の粒子が39.0質量％であった。これを発明例とする。   After dismantling all the walls and ceiling of the adjacent combustion chamber of the coke oven (furnace height 6m, furnace length 34 flu) and carrying it out of the furnace (step (A) above), the combustion chamber hearth brick and carbonization Repair of the furnace hearth brick was performed according to the procedure of the present invention shown in FIG. The new carbonization chamber hearth brick used for repairing the hearth of the carbonization chamber was made of unexpanded brick. The composition of the amorphous refractory used for repairing the hearth of the combustion chamber is 62% by mass for alumina, 33% by mass for silica, and 5% by mass or less for calcium oxide. The particle size distribution of the product particles was 9.5% by mass for particles having a particle size of more than 3.35 mm, 51.5% by mass for particles having a particle size of 3.35 to 0.15 mm, and 39.0% by mass for particles having a particle size of less than 0.15 mm. This is an invention example.

一方、従来は、燃焼室の壁体に加えて、燃焼室炉床煉瓦と炭化室炉床煉瓦を解体して炉外へ搬出した後、燃焼室炉床煉瓦と炭化室炉床煉瓦を新品と交換していた。これを従来例とする。   On the other hand, in addition to the wall of the combustion chamber, the combustion chamber hearth brick and the carbonization chamber hearth brick are dismantled and carried out of the furnace, and then the combustion chamber hearth brick and the carbonization chamber hearth brick are replaced with new ones. I was exchanging. This is a conventional example.

発明例における炭化室炉床煉瓦の解体を開始して、その搬出から燃焼室炉床煉瓦と炭化室炉床煉瓦の補修を終了するまでの所要日数をＭとし、従来例における燃焼室炉床煉瓦と炭化室炉床煉瓦の解体を開始して、その搬出から補修を終了するまでの所要日数をＮとすると、Ｍ／Ｎは約１／２であった。   The number of days required from the start of dismantling of the carbonization chamber hearth brick in the invention example until the completion of the repair of the combustion chamber hearth brick and the carbonization chamber hearth brick is M, and the combustion chamber hearth brick in the conventional example When the required number of days from the start of dismantling of the carbonization chamber hearth bricks to the completion of the repair is N, the M / N was about ½.

１ 燃焼室
２ 炭化室
３ 壁体
４ 蓄熱室
５ 壁体の耐火煉瓦
5a 凸型嵌合突起
5b 凹型嵌合溝
６ 燃焼室炉床煉瓦
７ 炭化室炉床煉瓦
８ 研削窪み
９ 不定形耐火物
10 丸鋼管
11 溝部 DESCRIPTION OF SYMBOLS 1 Combustion chamber 2 Coking chamber 3 Wall body 4 Thermal storage chamber 5 Refractory brick of wall
5a Convex projection
5b Recessed fitting groove 6 Combustion chamber hearth brick 7 Coking chamber hearth brick 8 Grinding recess 9 Indeterminate refractory
10 Round steel pipe
11 Groove

Claims (1)

コークス炉の炉床に配設される炉床煉瓦の補修方法において、燃焼室の壁体を解体して炉外へ搬出した後、前記コークス炉の炭化室の炉床を形成する炭化室炉床煉瓦を新品と交換し、前記燃焼室の炉床を形成する燃焼室炉床煉瓦の損耗した部位を研削除去して研削窪みを形成し、該研削窪みに不定形耐火物を流し込み、該不定形耐火物が乾燥する前にその上面に鋼製丸棒または丸鋼管を押し付けて溝部を設けることを特徴とするコークス炉の炉床煉瓦の補修方法。   In the repair method of hearth bricks arranged in the hearth of the coke oven, the wall of the combustion chamber is dismantled and carried out of the furnace, and then formed into the carbonization chamber hearth of the coke oven. The brick is replaced with a new one, and the worn part of the combustion chamber hearth brick forming the hearth of the combustion chamber is removed by grinding to form a grinding recess, and an amorphous refractory is poured into the grinding recess, the irregular shape A method for repairing hearth bricks in a coke oven, wherein a groove is formed by pressing a steel round bar or a round steel pipe on the upper surface of the refractory before drying.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59187082A (en) * 1983-04-08 1984-10-24 Nippon Steel Corp Mending of bottom brick of coke oven carbonization chamber
JP2003041258A (en) * 2001-07-27 2003-02-13 Nippon Steel Corp Measuring device of unevenness of coke oven bottom, oven bottom-repairing method and repairing apparatus
JP2007145890A (en) * 2005-11-24 2007-06-14 Taihokohzai:Kk Powdery repairing agent for hearth of coke oven carbonization chamber and method for repairing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59187082A (en) * 1983-04-08 1984-10-24 Nippon Steel Corp Mending of bottom brick of coke oven carbonization chamber
JP2003041258A (en) * 2001-07-27 2003-02-13 Nippon Steel Corp Measuring device of unevenness of coke oven bottom, oven bottom-repairing method and repairing apparatus
JP2007145890A (en) * 2005-11-24 2007-06-14 Taihokohzai:Kk Powdery repairing agent for hearth of coke oven carbonization chamber and method for repairing

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