JP5570012B2 - Thermal expansion absorption structure of the furnace wall - Google Patents

Thermal expansion absorption structure of the furnace wall Download PDF

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JP5570012B2
JP5570012B2 JP2010155025A JP2010155025A JP5570012B2 JP 5570012 B2 JP5570012 B2 JP 5570012B2 JP 2010155025 A JP2010155025 A JP 2010155025A JP 2010155025 A JP2010155025 A JP 2010155025A JP 5570012 B2 JP5570012 B2 JP 5570012B2
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thermal expansion
furnace wall
furnace
refractory
expansion
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JP2012017899A (en
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光正 戸高
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Nippon Steel Engineering Co Ltd
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Description

本発明は、円筒炉における炉壁の熱膨張吸収構造に関する。   The present invention relates to a thermal expansion absorption structure for a furnace wall in a cylindrical furnace.

鉄皮内面を耐火物でライニングした縦型の円筒炉において鉄皮又は耐火物の熱膨張吸収を行う場合、通常、予想膨張量に応じた膨張代が設けられるが、円筒炉において熱膨張は高さ方向のみでなく水平方向にも生じる場合がある。   When absorbing the thermal expansion of iron shell or refractory in a vertical cylindrical furnace lined with a refractory on the inner surface of the iron skin, an expansion allowance is usually provided according to the expected expansion amount, but thermal expansion is high in the cylindrical furnace. It may occur not only in the horizontal direction but also in the horizontal direction.

例えば図6には円筒炉1の出口側に連絡管5が連結されている場合を示す。円筒炉1及び連絡管5は鉄皮3内面に炉壁耐火物2がライニングされてなる。この場合、円筒炉1の高さ方向の熱膨張及び連絡管5の水平方向の熱膨張を吸収するため、熱膨張吸収部4が設けられる。   For example, FIG. 6 shows a case where the connecting pipe 5 is connected to the outlet side of the cylindrical furnace 1. The cylindrical furnace 1 and the connecting pipe 5 are formed by lining a furnace wall refractory 2 on the inner surface of the iron shell 3. In this case, in order to absorb the thermal expansion in the height direction of the cylindrical furnace 1 and the thermal expansion in the horizontal direction of the connecting pipe 5, the thermal expansion absorption part 4 is provided.

図4は熱膨張吸収部4の従来例を示す。高さ方向の膨張代としてA、水平方向の膨張代としてBの隙間が設けられ、これらの隙間には可縮性のある耐火ウール4bが充填されている。また、鉄皮3の外側部分では耐熱布4cにより上下の鉄皮3を連絡し、上下の鉄皮3の相対移動に対して自在な移動を可能としつつガスシールを行っている。   FIG. 4 shows a conventional example of the thermal expansion absorber 4. Clearances A are provided as expansion allowances in the height direction and B are provided as expansion allowances in the horizontal direction, and these gaps are filled with a contractible refractory wool 4b. In addition, the upper and lower iron skins 3 are connected to each other by the heat-resistant cloth 4c at the outer portion of the iron skin 3, and gas sealing is performed while allowing free movement relative to the relative movement of the upper and lower iron skins 3.

ところが、この従来の熱膨張吸収構造では、炉内に対して膨張代Aが通じているため、とくにダストの多い高温ガスを取り扱う炉では炉の運転停止とともに同部分にダストが侵入し圧縮され、次第に伸縮機能を消失し大きな膨張力が鉄皮や耐火物に作用する。そして、この膨張力により耐火物損傷や鉄皮変形に至る。このため、定期的に炉内から膨張代部分の清掃が必要となっていた。   However, in this conventional thermal expansion absorption structure, because the expansion allowance A is communicated to the inside of the furnace, especially in a furnace that handles high-temperature gas with a lot of dust, dust enters the same part and is compressed when the furnace is shut down. The expansion and contraction function gradually disappears, and a large expansion force acts on the iron skin and the refractory. This expansion force leads to refractory damage and iron skin deformation. For this reason, it is necessary to periodically clean the expansion allowance from the furnace.

一方、この膨張代部分が炉内に通じるのを避けるため、図5に示すように上下部分を重ねる構造もあるが、この構造では、高さ方向の膨張吸収のみで水平方向の膨張吸収はできない。   On the other hand, there is a structure in which the upper and lower portions are overlapped as shown in FIG. 5 in order to avoid the expansion allowance portion from reaching the inside of the furnace, but in this structure, the expansion absorption in the horizontal direction cannot be performed only by the expansion absorption in the height direction. .

また、特許文献1には、上下の炉壁を段差をもって接合する構造が開示されているが、この構造でも、高さ方向の膨張吸収のみで水平方向の膨張吸収はできない。   Further, Patent Document 1 discloses a structure in which upper and lower furnace walls are joined with a step, but this structure cannot absorb expansion in the horizontal direction only by absorbing expansion in the height direction.

特開2002−162169号公報JP 2002-162169 A

本発明が解決しようとする課題は、炉内に対して膨張代が通じてなく、しかも高さ方向のみでなく水平方向の熱膨張も吸収できる炉壁の熱膨張吸収構造を提供することにある。   The problem to be solved by the present invention is to provide a thermal expansion absorption structure for a furnace wall that does not allow expansion allowance to the inside of the furnace and can absorb not only the height direction but also the horizontal thermal expansion. .

本発明の炉壁の熱膨張吸収構造は、円筒炉における炉壁の熱膨張吸収部に、下面は下部
炉壁で形成された水平面で支持され、背面は上部炉壁の内面と接した部分が摺動するようにした耐火ブロックを周方向に配置し、この耐火ブロックの背面に耐火ウールを充填した高さ方向の膨張代を設け、かつ鉄皮側は耐熱布でガスシールしたものである。
Thermal expansion absorbing structure of the furnace wall present invention, the thermal expansion absorbing portion of the furnace wall in a cylindrical furnace, the lower surface is supported by a horizontal plane formed by the lower furnace wall, the back was contact with the inner surface of the upper furnace wall portion A refractory block that is made to slide is arranged in the circumferential direction, an expansion allowance in the height direction filled with refractory wool is provided on the back of the refractory block, and the iron skin side is gas-sealed with a heat-resistant cloth.

このように、本発明では、上部炉壁と下部炉壁との間に設けられた熱膨張吸収部が炉内に通じるのを防ぐため、熱膨張吸収部に耐火ブロックを周方向に配置し、この耐火ブロックの下面は下部炉壁で形成された水平面で支持され、かつ背面は上部炉壁の内面と接する構造とすることで、高さ方向の熱膨張は耐火ブロックの背面に設けた膨張代部分で吸収する。つまり、耐火ブロックの背面は上部炉壁の内面と接しているため、高さ方向の熱膨張はこの接した部分が摺動することにより吸収できる。また、この膨張代部分は耐火ブロックの背面にあり、炉内に開放されていないため、ダスト侵入を防止できる。一方、水平方向の熱膨張については、耐火ブロックの下面を支持している下部炉壁との摺動により吸収できる。   Thus, in the present invention, in order to prevent the thermal expansion absorption part provided between the upper furnace wall and the lower furnace wall from communicating with the furnace, the fire expansion block is arranged in the circumferential direction in the thermal expansion absorption part, The lower surface of this refractory block is supported by a horizontal plane formed by the lower furnace wall, and the rear surface is in contact with the inner surface of the upper furnace wall, so that the thermal expansion in the height direction is the expansion allowance provided on the rear surface of the refractory block. Absorb in part. That is, since the rear surface of the refractory block is in contact with the inner surface of the upper furnace wall, the thermal expansion in the height direction can be absorbed by sliding of the contacted portion. Moreover, since this expansion | swelling allowance part exists in the back surface of a refractory block and is not open | released in the furnace, it can prevent a dust intrusion. On the other hand, thermal expansion in the horizontal direction can be absorbed by sliding with the lower furnace wall supporting the lower surface of the refractory block.

本発明の熱膨張吸収構造では熱膨張吸収部分(膨張代部分)が炉内に通じていないため、ダスト侵入による膨張吸収能力の低下を防止でき、膨張反力による耐火物や鉄皮の損傷を防止できる。   In the thermal expansion absorption structure of the present invention, since the thermal expansion absorption part (expansion allowance part) does not lead to the inside of the furnace, it is possible to prevent a decrease in the expansion absorption capacity due to dust intrusion, and damage to the refractory and iron skin due to the expansion reaction force Can be prevented.

また、本発明の熱膨張吸収構造では、上記の効果を奏しつつ、高さ方向のみでなく水平方向の熱膨張も吸収できる。   Further, the thermal expansion absorption structure of the present invention can absorb not only the height direction but also the horizontal thermal expansion while exhibiting the above effects.

本発明の熱膨張吸収構造を示す縦断面図である。It is a longitudinal cross-sectional view which shows the thermal expansion absorption structure of this invention. 図1のC−C断面図である。It is CC sectional drawing of FIG. 図1の初期状態から熱膨張した状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state thermally expanded from the initial state of FIG. 従来の熱膨張吸収構造を示す縦断面図である。It is a longitudinal cross-sectional view which shows the conventional thermal expansion absorption structure. 従来の熱膨張吸収構造を示す縦断面図である。It is a longitudinal cross-sectional view which shows the conventional thermal expansion absorption structure. 円筒炉の構成を示す縦断面図である。It is a longitudinal cross-sectional view which shows the structure of a cylindrical furnace.

以下、図面に示す実施例に基づき、本発明の実施の形態を説明する。   Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings.

図1は本発明の熱膨張吸収構造を示す縦断面図、図2は図1のC−C断面図である。   1 is a longitudinal sectional view showing a thermal expansion absorption structure of the present invention, and FIG. 2 is a sectional view taken along the line CC in FIG.

上部炉壁1aと下部炉壁1bとの間の熱膨張吸収部4に耐火ブロック4aが配置されている。この耐火ブロック4aは、図2に示すように放射状に等間隔で分割され、下部炉壁1bで形成された平面X上に周方向に載置されている。また耐火ブロック4aの背面は、上部炉壁1aの内面Zと接触している。さらに耐火ブロック4aの背面には、耐火ウール4bが充填され、高さ方向の膨張代Aが形成されている。高さ方向の膨張に対しては膨張代A部分が圧縮されることになる。   A refractory block 4a is arranged in the thermal expansion absorption part 4 between the upper furnace wall 1a and the lower furnace wall 1b. As shown in FIG. 2, the refractory blocks 4a are radially divided at equal intervals and placed on the plane X formed by the lower furnace wall 1b in the circumferential direction. Further, the back surface of the refractory block 4a is in contact with the inner surface Z of the upper furnace wall 1a. Further, the back surface of the fireproof block 4a is filled with fireproof wool 4b to form an expansion allowance A in the height direction. For expansion in the height direction, the expansion allowance A portion is compressed.

なお、実施例では、耐火ブロック4aの背面側上部を切り欠いて上部炉壁1aの内面Zと接触させるようにしているが、これは、平面X上に載置される耐火ブロック4aの下面の面積を大きくして、耐火ブロック4aの安定性を向上させるためである。   In the embodiment, the upper part on the back side of the refractory block 4a is cut out and brought into contact with the inner surface Z of the upper furnace wall 1a. However, this is because of the lower surface of the refractory block 4a placed on the plane X. This is to increase the area and improve the stability of the fireproof block 4a.

耐火ブロック4aは、炉内側へは隣接するブロックとのせりにより単独では移動はできず、背面は上部炉壁1aの内面Zで止められている。したがって、耐火ブロック4aは水平方向へは上部炉壁1aと一体的に移動する。上下炉壁の相対移動は上部炉壁1aと連動して動く耐火ブロック4aが平面X上をすべることにより可能となっている。   The refractory block 4a cannot move by itself with the adjacent block to the inside of the furnace, and the back surface is stopped by the inner surface Z of the upper furnace wall 1a. Therefore, the refractory block 4a moves integrally with the upper furnace wall 1a in the horizontal direction. The relative movement of the upper and lower furnace walls is made possible by sliding the refractory block 4a moving in conjunction with the upper furnace wall 1a on the plane X.

図3には、図1の初期状態から熱膨張した状態を示す。高さ方向には図1のAはA´まで圧縮され、水平方向には耐火ブロック4aが平面X上をすべり、B´移動している。このように高さ方向の熱膨張に対しては耐火ブロック4aが上部炉壁1aの内面Zで摺動し、水平方向の熱膨張に対しては耐火ブロック4aが平面Xで摺動するので、耐火ブロック4aの背面にある膨張代C部分は炉内ダスト環境からは隔離されている。さらに上下の鉄皮3は鉄皮外側において耐熱布4cで連結され、上下の鉄皮3の相対移動に抵抗することなくガスシールされている。この耐熱布4cは耐火ウール4bで断熱されているため、炉内高温雰囲気からは熱的に保護されている。   FIG. 3 shows a state of thermal expansion from the initial state of FIG. In the height direction, A in FIG. 1 is compressed to A ′, and in the horizontal direction, the refractory block 4a slides on the plane X and moves B ′. Thus, the refractory block 4a slides on the inner surface Z of the upper furnace wall 1a for the thermal expansion in the height direction, and the refractory block 4a slides on the plane X for the thermal expansion in the horizontal direction. The expansion allowance C portion on the back of the refractory block 4a is isolated from the furnace dust environment. Further, the upper and lower iron skins 3 are connected by a heat-resistant cloth 4c on the outer side of the iron skin, and are gas-sealed without resisting relative movement of the upper and lower iron skins 3. Since the heat-resistant cloth 4c is thermally insulated by the fireproof wool 4b, it is thermally protected from the high temperature atmosphere in the furnace.

なお、実施例では、耐火ブロック4aを周方向に放射状に分割したが、分割することなくリング状の一体物としてもよい。ただし、一体物は製作が難しく、熱衝撃等で破損するおそれもあるため、実施例ように周方向に放射状に分割するのが好ましい。   In the embodiment, the fireproof block 4a is radially divided in the circumferential direction. However, the fireproof block 4a may be a ring-shaped integrated body without being divided. However, since it is difficult to manufacture the integrated object and it may be damaged by thermal shock or the like, it is preferable to divide it radially in the circumferential direction as in the embodiment.

また、本発明を適用する円筒炉の横断面形状は、典型的には円形であるが、楕円形であっても本発明は適用可能である。   The cross-sectional shape of the cylindrical furnace to which the present invention is applied is typically circular, but the present invention is applicable even if it is elliptical.

本発明は、熱膨張吸収を必要とする耐火物でライニングされた円筒炉(その煙道管や連絡管も含む)に利用可能である。例えば、高温ガス中に多量のダストを含む廃棄物燃焼炉にとくに有効である。   The present invention can be used for a cylindrical furnace (including its flue pipe and communication pipe) lined with a refractory that requires thermal expansion absorption. For example, it is particularly effective for a waste combustion furnace containing a large amount of dust in a high-temperature gas.

1 円筒炉
1a 上部炉壁
1b 下部炉壁
2 炉壁耐火物
3 鉄皮
4 熱膨張吸収部
4a 耐火ブロック
4b 耐熱ウール
4c 耐熱布
5 連絡管
A 高さ方向の膨張代
A´ 高さ方向移動後寸法
B 水平方向の膨張代
B´ 水平方向移動寸法
X 下部炉壁1bで形成された平面(水平方向摺動面)
Z 上部炉壁1aの内面(高さ方向摺動面)
DESCRIPTION OF SYMBOLS 1 Cylindrical furnace 1a Upper furnace wall 1b Lower furnace wall 2 Furnace wall refractory 3 Iron skin 4 Thermal expansion absorption part 4a Fireproof block 4b Heat-resistant wool 4c Heat-resistant cloth 5 Connecting pipe A Height expansion allowance A 'After height direction movement Dimension B Horizontal expansion allowance B 'Horizontal movement dimension X Plane formed by lower furnace wall 1b (horizontal sliding surface)
Z inner surface of upper furnace wall 1a (height sliding surface)

Claims (2)

円筒炉における炉壁の熱膨張吸収部に、下面は下部炉壁で形成された水平面で支持され、背面は上部炉壁の内面と接した部分が摺動するようにした耐火ブロックを周方向に配置し、この耐火ブロックの背面に耐火ウールを充填した高さ方向の膨張代を設け、かつ鉄皮側は耐熱布でガスシールした炉壁の熱膨張吸収構造。 The thermal expansion absorbing portion of the furnace wall in a cylindrical furnace, the lower surface is supported by a horizontal plane formed by the lower furnace walls, rear refractory blocks have inner surfaces with contact portions of the upper furnace walls so as to slide in the circumferential direction The thermal expansion absorption structure of the furnace wall is arranged and provided with an expansion allowance in the height direction filled with refractory wool on the back of the refractory block, and the iron skin side is gas-sealed with a heat-resistant cloth. 前記耐火ブロックは、周方向に放射状に分割されている請求項1に記載の炉壁の熱膨張吸収構。   The said refractory block is a thermal expansion absorption structure of the furnace wall of Claim 1 divided | segmented radially by the circumferential direction.
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