JP3743011B2 - Coke oven flame sprayed repair layer formation method - Google Patents
Coke oven flame sprayed repair layer formation method Download PDFInfo
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- JP3743011B2 JP3743011B2 JP29267194A JP29267194A JP3743011B2 JP 3743011 B2 JP3743011 B2 JP 3743011B2 JP 29267194 A JP29267194 A JP 29267194A JP 29267194 A JP29267194 A JP 29267194A JP 3743011 B2 JP3743011 B2 JP 3743011B2
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- repair layer
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Description
【０００１】
【産業上の利用分野】
この発明は、シリカ質のコークス炉の内張り炉壁損耗部分の補修層の形成方法であって、補修層およびその素地の炉壁の損傷防止に好適な耐久性に優れるコークス炉火炎溶射補修層の形成方法に関する。
【０００２】
炉や耐火物装置の火炎溶射補修技術は、修復すべき炉壁材質と略同様な組成を有する補修用耐火性粉体に酸化性粉体を配合した混合粉を用い、酸化性粉体を酸素で燃焼させたときの発熱を利用すると共に、酸化性粉体自身も酸化物となり耐火性の補修層を形成し、損耗炉壁を補修するものである。
【０００３】
【従来の技術】
従来の火炎溶射補技術としては、例えば、特公昭49−46364 号公報（耐火物の形成方法および装置）には、耐火性粉体と混合した50μｍ以下の燃焼して耐火性酸化物を形成する酸化性粉体とを熱間雰囲気中の炉壁に投射し、酸化性粉体を燃焼させて補修する手段が、また、特公平５−21865 号公報（耐火体成形方法および耐火体成形用組成物）には、耐火体の信頼性、堅牢性および耐久性を高めるため耐火性粉体と酸化性粉体との粒度および粒径分布を特定する手段がそれぞれ提案開示されている。
【０００４】
これらの火炎溶射補修手段は、補修方法あるいは補修材料に関しての考案であり、耐火性補修層自体のち密性、耐熱衝撃性および耐食性などの向上を狙ったものであるが、火炎溶射補修層の物性とその素地となる炉壁との物性の整合性に関しては全く注目していず、そのため、実操業において、補修層とその素地の炉壁との物性値の不整合により、補修層または炉壁に亀裂が発生し耐久性を著しく低下させる場合があった。
【０００５】
【発明が解決しようとする課題】
この発明は、コークス炉炉壁の火炎溶射補修層を対象として、前記した問題点を有利に解決しようとするものであり、補修層とその素地の炉壁との物性に着目し、補修層や炉壁を損傷させることがなく、耐久性を向上できるコークス炉火炎溶射補修層の形成方法を提案することを目的とする。
【０００６】
【課題を解決するための手段】
この発明の要旨は以下のとおりである。
シリカ質のコークス炉の炉壁の火炎溶射補修層の形成方法であって、500 〜1200℃の温度域での該補修層の平均熱伝導率の炉壁の平均熱伝導率に対する比の値ｘと、同じく500 〜1200℃の温度域での該補修層の平均ヤング率の炉壁の平均ヤング率に対する比の値ｙとが、下記式 (1)および (2)の関係を満たすように適合させることを特徴とするコークス炉火炎溶射補修層の形成方法。
〔記〕
1.25 ｘ−0.125 ≧ｙ≧2.5 ｘ−2.0 ----- (1)
ｙ≦1.0 ----- (2)
【０００７】
【作用】
この発明の限定理由について、実験・検討結果をもとに以下に述べる。
熱応力計算や図１のグラフに示すコークス炉の熱サイクルをシミュレートした亀裂発生実験により、補修層とその素地の炉壁とに生じる応力を解析した結果、それらの応力の大きさや亀裂の発生には、下記するように補修層の熱伝導率とヤング率とが大きく関係することが明らかとなった。
【０００８】
熱伝導率：補修層の熱伝導率が高すぎる場合は、補修層内の温度分布が緩やかになることで補修層に生じる応力は小さいが、逆に炉壁内の温度分布はその温度差が大きくなり炉壁に大きな応力が作用して亀裂が生じ、炉壁を損傷させることになる。一方補修層の熱伝導率が低すぎる場合は、補修層内の温度分布はその温度差が大きくなり、補修層に大きな応力が作用して亀裂が生じ、補修層を損傷させ、共に耐久性を低下させる。
【０００９】
ヤング率：補修層のヤング率は低いことが補修層にかかる同一ひずみ量に対する応力が低くなり望ましい。逆にヤング率が高い場合には補修層さらには二次的に炉壁に生じる応力が大きくなり亀裂が生じて耐久性を低下させる。
【００１０】
そこで、さらに実験・検討を重ねた結果、コークス炉において、500 〜1200℃の温度域における補修層の平均熱伝導率の炉壁の平均熱伝導率に対する比の値ｘと、500 〜1200℃の温度域における補修層の平均ヤング率の炉壁の平均ヤング率に対する比の値ｙとが、前記したように下記式 (1)および (2)の関係を満たすことにより、補修層やその素地の炉壁の亀裂の発生を防止でき、耐久性を著しく向上できることが判明した。
【００１１】
1.25 ｘ−0.125 ≧ｙ≧2.5 ｘ−2.0 ----- (1)
ｙ≦1.0 ----- (2)
すなわち、上記式 (1)は、コークス炉の炉壁の物性値に応じてその補修層の物性値も変化し、補修層の限界引張り強さなども異なる場合があるが、いずれの場合もｙ＞1.25ｘ−0.125 では補修層に亀裂が発生し、ｙ＜2.5 ｘ−2.0 では炉壁に亀裂が発生するので不適である。
【００１２】
また、上記式 (2)は補修層のヤング率が大きく炉壁のヤング率を超えると、発生する応力が大きくなり耐久性が低下するので好ましくない。
【００１３】
ここに、上記関係を図２にまとめて示す。この図２はこの発明の限定領域を示す説明図であり、横軸にｘ、縦軸にｙをとりこの発明の限定領域を斜線で示している。
【００１４】
そして、さらに補修層および炉壁の耐久性の観点からより詳細に検討した結果、ｘおよびｙの値がそれぞれ下記式 (3)および (4)の範囲を同時に満たすことが、耐久性の点でより好適であることが判明した。なお、この好適領域は上掲図２において点線で示している。
0.3 ≦ｘ≦0.7 ----- (3)
0.05≦ｙ≦0.25 ----- (4)
ここで、上記において、熱伝導率は、コークス炉の炉壁についてはＪＩＳ Ｒ2618の熱線法を用いて測定した値であり、補修層についてはＪＩＳ Ｒ 1611のレーザフラッシュ法を用いて測定した値である。また、ヤング率は、コークス炉の炉壁、補修層ともにＪＩＳ Ｒ 1602の高温での静的法を用いて測定した値である。
【００１５】
【実施例】
平均粒径40〜300 μｍのシリカ質の耐火性酸化物粒子数種と、平均粒径50〜200 μｍの金属シリコンの易被酸化性物質粒子数種とから、それぞれ一種つづを選び、耐火性酸化物粒子を70〜90重量％、易被酸化性物質粒子を30〜10重量％の範囲で配合し混合した数種類の補修用粉体を、可燃性ガスとしてプロパンを用い（流速：２〜15Ｎｍ3 ／ｈ）、750 ℃の炉内に置いたシリカ質素地れんがに火炎溶射し、該れんが上に耐火性の火炎溶射補修層を形成させた。
【００１６】
この火炎溶射補修層を形成したシリカ質素地れんがをコークス炉を想定した前掲図１に示した熱サイクルを加えたのち、補修層および素地れんがの亀裂の発生状況を調査した。
【００１７】
これらの調査結果を表１にまとめて示す。
【００１８】
【表１】
この表１から明らかなように、適合例には補修層および素地れんが共に亀裂の発生は認められないのに対し、比較例には補修層または素地れんがのいずれか一方に亀裂が発生している。
【００１９】
【発明の効果】
この発明は、シリカ質のコークス炉内壁の火炎溶射補修層の形成方法であって、500 〜1200℃の温度域での該補修層の平均熱伝導率の炉壁の平均熱伝導率に対する比の値と、500 〜1200℃の温度域での補修層のヤング率の炉壁の平均ヤング率に対する比の値との関係などを特定し補修層と炉壁との物性の整合性をとるものであり、この発明によれば、補修層および炉壁の亀裂の発生を防止でき、コークス炉の耐久性を著しく向上できると共に、操業の安定性も向上する。
【図面の簡単な説明】
【図１】コークス炉の熱サイクルを示す説明図である。
【図２】この発明の限定領域を示す説明図である。[0001]
[Industrial application fields]
The present invention relates to a method for forming a repaired layer of a worn-out wall of a lining furnace wall of a siliceous coke oven, which is excellent in durability suitable for preventing damage to the repaired layer and the furnace wall of the base . It relates to a forming method .
[0002]
The flame spray repair technology for furnaces and refractory equipment uses a mixed powder in which an oxidizing powder is mixed with a refractory powder for repair having the same composition as the furnace wall material to be repaired. In addition to utilizing the heat generated when burned at, the oxidizing powder itself becomes an oxide to form a fire-resistant repair layer to repair the wear furnace wall.
[0003]
[Prior art]
As a conventional flame spraying supplement technique, for example, Japanese Patent Publication No. 49-46364 (method and apparatus for forming a refractory) forms a refractory oxide by burning 50 μm or less mixed with a refractory powder. Japanese Patent Publication No. 5-21865 (Method for forming a refractory body and composition for forming a refractory body is disclosed in Japanese Patent Publication No. 5-21865). In order to improve the reliability, fastness and durability of the refractory body, a means for specifying the particle size and particle size distribution of the refractory powder and the oxidizing powder is proposed and disclosed respectively.
[0004]
These flame spray repair methods are devised for repair methods or materials, and aim to improve the denseness, thermal shock resistance and corrosion resistance of the fire resistant repair layer itself, but the physical properties of the flame spray repair layer No attention has been paid to the consistency of the physical properties between the repair layer and the furnace wall that is the base material.Therefore, in actual operation, due to the mismatch of the physical property values between the repair layer and the furnace wall of the base material, In some cases, cracks occurred and the durability was significantly reduced.
[0005]
[Problems to be solved by the invention]
The present invention is intended to advantageously solve the above-mentioned problems for the flame sprayed repair layer of the coke oven furnace wall, paying attention to the physical properties of the repair layer and the furnace wall of the base, An object of the present invention is to propose a method for forming a coke oven flame sprayed repair layer that can improve durability without damaging the furnace wall.
[0006]
[Means for Solving the Problems]
The gist of the present invention is as follows.
A method for forming a flame sprayed repair layer on a furnace wall of a siliceous coke oven, wherein a value x of a ratio of an average thermal conductivity of the repair layer to an average thermal conductivity of the furnace wall in a temperature range of 500 to 1200 ° C When, and a likewise 500-1200 value y of the ratio to the average Young's modulus of the furnace wall of the average Young's modulus of the repair layer in the temperature range of ° C., in Suyo satisfy a relationship represented by the following formula (1) and (2) method of forming a coke oven flame spray mending layer characterized in that to adapt.
〔Record〕
1.25 x−0.125 ≧ y ≧ 2.5 x−2.0 ----- (1)
y ≦ 1.0 ----- (2)
[0007]
[Action]
The reason for limitation of the present invention will be described below based on the results of experiments and examinations.
As a result of analyzing the stress generated in the repair layer and the furnace wall of the base by the thermal stress calculation and the crack generation experiment simulating the thermal cycle of the coke oven shown in the graph of Fig. 1, the magnitude of those stresses and the occurrence of cracks It was revealed that the thermal conductivity and the Young's modulus of the repair layer are greatly related to each other as described below.
[0008]
Thermal conductivity: When the thermal conductivity of the repair layer is too high, the stress generated in the repair layer is small because the temperature distribution in the repair layer becomes gentle, but conversely the temperature distribution in the furnace wall has a temperature difference. The furnace wall becomes large and a large stress acts on the furnace wall to cause a crack and damage the furnace wall. On the other hand, if the thermal conductivity of the repair layer is too low, the temperature distribution in the repair layer becomes large, and a large stress acts on the repair layer to cause cracks and damage the repair layer. Reduce.
[0009]
Young's modulus: It is desirable that the Young's modulus of the repair layer is low because the stress for the same strain applied to the repair layer is low. On the other hand, when the Young's modulus is high, the stress generated on the repair layer and further on the furnace wall is increased, and cracks are generated to reduce durability.
[0010]
Therefore, as a result of repeated experiments and examinations, in the coke oven, the value x of the ratio of the average thermal conductivity of the repair layer to the average thermal conductivity of the furnace wall in the temperature range of 500 to 1200 ° C and 500 to 1200 ° C When the value y of the ratio of the average Young's modulus of the repair layer to the average Young's modulus of the furnace wall in the temperature region satisfies the relationship of the following formulas (1) and (2) as described above, the repair layer and its substrate It was found that cracking of the furnace wall can be prevented and the durability can be remarkably improved.
[0011]
1.25 x−0.125 ≧ y ≧ 2.5 x−2.0 ----- (1)
y ≦ 1.0 ----- (2)
That is, in the above formula (1), the physical property value of the repair layer changes depending on the physical property value of the coke oven wall, and the limit tensile strength of the repair layer may be different. > 1.25x−0.125 is not suitable because cracks occur in the repair layer and y <2.5x−2.0 because cracks occur in the furnace wall.
[0012]
Further, the above formula (2) is not preferable if the Young's modulus of the repair layer is large and exceeds the Young's modulus of the furnace wall, because the stress generated increases and the durability decreases.
[0013]
Here, the above relationships are collectively shown in FIG. FIG. 2 is an explanatory diagram showing a limited region of the present invention, where the horizontal axis is x and the vertical axis is y, and the limited region of the present invention is indicated by hatching.
[0014]
As a result of further detailed examination from the viewpoint of durability of the repair layer and the furnace wall, it was confirmed that the values of x and y satisfy the following formulas (3) and (4) at the same time in terms of durability. It turned out to be more suitable. This preferred region is indicated by a dotted line in FIG.
0.3 ≦ x ≦ 0.7 ----- (3)
0.05 ≦ y ≦ 0.25 ----- (4)
Here, in the above, the thermal conductivity is a value measured using the hot wire method of JIS R2618 for the furnace wall of the coke oven, and is a value measured using the laser flash method of JIS R 1611 for the repair layer. is there. The Young's modulus is a value measured using a static method at a high temperature of JIS R 1602 for both the wall of the coke oven and the repair layer.
[0015]
【Example】
Select one from several types of siliceous refractory oxide particles with an average particle size of 40-300 μm and several types of easily oxidizable particles of metal silicon with an average particle size of 50-200 μm. Several types of repair powders, in which 70 to 90% by weight of oxide particles and 30 to 10% by weight of easily oxidizable material particles are mixed and mixed, use propane as a flammable gas (flow rate: 2 to 15 Nm) 3 / h), a siliceous base brick placed in a furnace at 750 ° C. was flame sprayed, and a refractory flame spray repair layer was formed on the brick.
[0016]
After applying the thermal cycle shown in FIG. 1 assuming a coke oven to the siliceous base brick in which this flame sprayed repair layer was formed, the occurrence of cracks in the repair layer and the base brick was investigated.
[0017]
These survey results are summarized in Table 1.
[0018]
[Table 1]
As is apparent from Table 1, in the conforming example, neither the repair layer nor the base brick is cracked, whereas in the comparative example, either the repair layer or the base brick is cracked. .
[0019]
【The invention's effect】
The present invention relates to a method for forming a flame sprayed repair layer on the inner wall of a siliceous coke oven, wherein the ratio of the average thermal conductivity of the repair layer to the average thermal conductivity of the furnace wall in a temperature range of 500 to 1200 ° C. The relationship between the value and the ratio of the Young's modulus of the repair layer to the average Young's modulus of the furnace wall in the temperature range of 500 to 1200 ° C is specified, and the physical properties of the repair layer and the furnace wall are matched. And according to this invention, generation | occurrence | production of the crack of a repair layer and a furnace wall can be prevented, durability of a coke oven can be improved remarkably, and stability of operation also improves.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a thermal cycle of a coke oven.
FIG. 2 is an explanatory diagram showing a limited area of the present invention.
Claims (1)
〔記〕
1.25 ｘ−0.125 ≧ｙ≧2.5 ｘ−2.0 ----- (1)
ｙ≦1.0 ----- (2)A method for forming a flame sprayed repair layer on a furnace wall of a siliceous coke oven, wherein a value x of a ratio of an average thermal conductivity of the repair layer to an average thermal conductivity of the furnace wall in a temperature range of 500 to 1200 ° C When, and a likewise 500-1200 value y of the ratio to the average Young's modulus of the furnace wall of the average Young's modulus of the repair layer in the temperature range of ° C., in Suyo satisfy a relationship represented by the following formula (1) and (2) method of forming a coke oven flame spray mending layer characterized in that to adapt.
〔Record〕
1.25 x−0.125 ≧ y ≧ 2.5 x−2.0 ----- (1)
y ≦ 1.0 ----- (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29267194A JP3743011B2 (en) | 1994-11-28 | 1994-11-28 | Coke oven flame sprayed repair layer formation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29267194A JP3743011B2 (en) | 1994-11-28 | 1994-11-28 | Coke oven flame sprayed repair layer formation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08151278A JPH08151278A (en) | 1996-06-11 |
| JP3743011B2 true JP3743011B2 (en) | 2006-02-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29267194A Expired - Fee Related JP3743011B2 (en) | 1994-11-28 | 1994-11-28 | Coke oven flame sprayed repair layer formation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3743011B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6158867A (en) * | 1984-08-24 | 1986-03-26 | 住友金属工業株式会社 | Flame spray material for furnace wall maintenance |
-
1994
- 1994-11-28 JP JP29267194A patent/JP3743011B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08151278A (en) | 1996-06-11 |
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