JP2007277600A - Sealing device in continuous annealing furnace - Google Patents
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Abstract
Description
本発明は、帯状鋼板を浮揚通板させる連続焼鈍炉において、炉内の雰囲気ガスの流れを制御できるシール装置に関する。 The present invention relates to a sealing apparatus capable of controlling the flow of atmospheric gas in a furnace in a continuous annealing furnace in which a strip steel plate is floated and passed.
例えば冷延鋼板では８００℃を超える高温で焼鈍する場合がある。一般的なハースロール炉では、こうした温度域で焼鈍すると、鋼板表面の鉄系酸化物や鋼板中に含まれる元素の金属間化合物がハースロール表面にビルドアップし、鋼板に押疵を生じ、冷延鋼板の表面品位や特性の劣化を引き起こす。
そこで、例えば特許文献１では高温区間を浮揚式支持装置で支持することにより、押疵の発生がなく、高温焼鈍が可能となる製造技術が開示されている。
For example, a cold-rolled steel sheet may be annealed at a high temperature exceeding 800 ° C. In a typical hearth roll furnace, if annealing is performed in such a temperature range, iron-based oxides on the surface of the steel sheet and intermetallic compounds of elements contained in the steel sheet build up on the surface of the hearth roll, causing pressing on the steel sheet and cooling. It causes deterioration of the surface quality and properties of the rolled steel sheet.
Therefore, for example, Patent Document 1 discloses a manufacturing technique in which a high temperature section is supported by a levitation support device so that there is no occurrence of pressing and high temperature annealing is possible.
一方、連続焼鈍炉では、直火帯での直火バーナの燃焼排ガス雰囲気、輻射管式加熱帯での水素ガスと窒素ガスの混合雰囲気、脱炭のための水素ガスと水蒸気と窒素ガスの混合雰囲気、循環型冷却帯での窒素ガス雰囲気などの雰囲気条件を、処理目的に応じて使い分けることが行われている。
このような複数の雰囲気条件を単一の炉で使い分けるためには、処理鋼帯の熱処理条件や品質の確保、炉内構造物の酸化などによる劣化防止、防爆などの観点から、炉内雰囲気を帯域ごとに縁切りするシール装置が必要となってくる。
On the other hand, in the continuous annealing furnace, the combustion exhaust gas atmosphere of the direct flame burner in the direct flame zone, the mixed atmosphere of hydrogen gas and nitrogen gas in the radiant tube heating zone, the mixture of hydrogen gas, water vapor and nitrogen gas for decarburization The atmospheric conditions such as the atmosphere and the nitrogen gas atmosphere in the circulation type cooling zone are properly used according to the purpose of processing.
In order to properly use these multiple atmosphere conditions in a single furnace, the furnace atmosphere should be changed from the standpoints of ensuring the heat treatment conditions and quality of the treated steel strip, preventing deterioration due to oxidation of the internal structure of the furnace, and preventing explosions. A sealing device that cuts out each band is required.
そのようなシール装置として、連続焼鈍炉内を通板する鋼板の位置が定まるハースロール炉では、鋼板の下面側をハースロールで支持し、上面側を耐熱材料で構成した仕切板やシールロールで遮蔽する装置が、例えば特許文献２や特許文献３により提案されている。
しかし、特許文献１と同様に、鋼板をフロータ設備を用いて浮揚通板させる、いわゆるフロータ炉では、鋼板下面側にハースロールがなく、しかも、板厚や張力によって炉中のカテナリー形状が変化するため、ハースロール炉のように、ロールや仕切板を鋼板に接触させたり近接させたりするシール方法は、フロータ炉には適用できない問題がある。
As such a sealing device, in the hearth roll furnace in which the position of the steel plate passing through the continuous annealing furnace is determined, the lower surface side of the steel plate is supported by a hearth roll, and the upper surface side is formed by a partition plate or a seal roll made of a heat resistant material. For example,
However, similarly to Patent Document 1, in a so-called floater furnace in which a steel plate is floated using a floater facility, there is no hearth roll on the lower surface side of the steel plate, and the catenary shape in the furnace changes depending on the plate thickness and tension. Therefore, there is a problem that a sealing method in which a roll or a partition plate is brought into contact with or close to a steel plate as in a hearth roll furnace cannot be applied to a floater furnace.
また、他のシール装置として、炉中に中間室を設け、前室および後室から中間室に流入した混合雰囲気を中間室から排気する方式のものがある。
この方式はフロータ炉でも有効であるが、水素などの可燃性ガスを使用する連続焼鈍炉で循環ファンを稼動させる場合には、外気の混入による爆発や異常燃焼を防止するために一定(例えば１０Ｐａ以上)の炉内圧力を保持する必要があり、中間室で排気する方法では炉内圧力の維持のため高価な雰囲気ガスをさらに大量に使用することとなる。 また、排気するガスを回収・分離して再利用する場合には、炉内圧力調整機構や分離装置などが必要で設備費が高額となる。
As another sealing device, there is a type in which an intermediate chamber is provided in a furnace, and a mixed atmosphere flowing into the intermediate chamber from the front chamber and the rear chamber is exhausted from the intermediate chamber.
This method is also effective in a floater furnace, but when a circulating fan is operated in a continuous annealing furnace using a flammable gas such as hydrogen, it is constant (for example, 10 Pa in order to prevent explosion and abnormal combustion due to mixing of outside air. It is necessary to maintain the pressure in the furnace described above, and in the method of exhausting in the intermediate chamber, a large amount of expensive atmospheric gas is used to maintain the pressure in the furnace. Further, when the exhaust gas is recovered, separated, and reused, an in-furnace pressure adjustment mechanism, a separation device, and the like are required, resulting in high equipment costs.
さらに、フロータ炉におけるシール装置として、シール装置およびガスカーテンを鋼板上下面に対に配置し、シール装置の前後圧力を調整することにより炉内ガスの炉長方向への流れを制止する装置が、特許文献４により提案されており、フロータ炉におけるシール装置としては一定の効果が得られている。
しかし、その装置においては、シール効果を得るために圧力を蓄える中間室を設けているが、中間室に圧力を蓄え、その圧力を制御するには、加熱帯前後などの高温環境下に複雑な装置を多数配置する必要があり、設備費が高額となる。さらに、効果的に中間室に圧力を蓄えるには、シール装置を鋼板に近接し、かつ炉高・炉幅を可能な限り小さくする必要があり、この結果メンテナンス性や板通しの作業性などで劣るという問題がある。
However, in the apparatus, an intermediate chamber for storing pressure is provided in order to obtain a sealing effect. However, in order to store pressure in the intermediate chamber and control the pressure, it is complicated under a high temperature environment such as before and after the heating zone. It is necessary to arrange a large number of devices, resulting in high equipment costs. Furthermore, in order to store pressure in the intermediate chamber effectively, it is necessary to make the sealing device close to the steel plate and make the furnace height and width as small as possible. There is a problem of being inferior.
本発明は、上記のような従来技術の欠点を解消するためになされたものであり、鋼板を浮揚通板させるフロータ設備を有する連続焼鈍炉で利用できる、鋼板に無接触なシール装置であって、メンテナンス性や作業性に優れ、しかも安価なシール装置を提供することを課題とする。 The present invention has been made in order to eliminate the drawbacks of the prior art as described above, and is a non-contact sealing apparatus for steel plates that can be used in a continuous annealing furnace having a floater equipment for floating and passing steel plates. It is an object to provide a sealing device that is excellent in maintainability and workability and is inexpensive.
上記の課題を解決するために、本発明は次のようにしたことを特徴とする。
請求項１のシール装置の発明は、複数の吹出口を有するフロータ設備から吹込まれる雰囲気循環ガスを用いて帯状鋼板を浮揚通板させ、雰囲気循環ガスの一部を吸込口から吸込むことにより雰囲気循環ガスを循環させる連続焼鈍炉におけるシール装置であって、前記フロータ設備の前後に仕切板を配置し、フロータ設備の前段側端末の吹出口から後段側に向かって各吹出口の雰囲気循環ガス流量を順次積算した積算値が、前記吸込口から吸込むガス流量の１／２を超える位置と後段側の仕切板の間に前記吸込口を配置したことにより、仕切板前段から後段への雰囲気ガスの流入を抑制することを特徴とする。
In order to solve the above problems, the present invention is characterized as follows.
The invention of the sealing device according to claim 1 is a method in which a strip steel plate is floated using an atmosphere circulation gas blown from a floater facility having a plurality of outlets, and a part of the atmosphere circulation gas is sucked from the suction port. A sealing device in a continuous annealing furnace for circulating a circulating gas, wherein a partition plate is arranged before and after the floater equipment, and an atmosphere circulation gas flow rate of each blowout outlet from the blower outlet of the front stage side of the floater equipment toward the rear stage side By arranging the suction port between the position where the integrated value obtained by sequentially integrating the half of the gas flow rate sucked from the suction port and the partition plate on the rear stage side, the inflow of atmospheric gas from the front stage to the rear stage of the partition plate is prevented. It is characterized by suppressing.
請求項２のシール装置の発明は、後段からの雰囲気ガス供給が存在する場合に、前記積算値から、後段からの雰囲気ガス流入量を差し引いた量が、前記吸込口から吸込むガス流量の１／２を超える位置と後段側の仕切板の間に前記吸込口を配置したことを特徴とする。
請求項３のシール装置の発明は、該請求項に記載されているように、前記フロータ設備を複数個連続的に設けるとともに、仕切板を各フロータ設備の前後に位置するように配置し、各フロータ設備において、前記吸込口を請求項１あるいは請求項２に記載の位置に配置したことを特徴とする。
According to a second aspect of the present invention, when there is an atmospheric gas supply from the subsequent stage, the amount obtained by subtracting the atmospheric gas inflow from the subsequent stage from the integrated value is 1 / of the gas flow rate sucked from the suction port. The suction port is arranged between a position exceeding 2 and a rear partition plate.
The invention of the sealing device according to claim 3, as described in the claim, provides a plurality of the floater equipments continuously, arranges the partition plates so as to be positioned before and after each of the floater equipments, In the floater facility, the suction port is arranged at a position according to claim 1 or
請求項１の発明によれば、フロータ設備を備えた連続焼鈍炉において、フロータ設備を利用してシール装置としているので、従来の構造より安価で、かつ耐久性およびメンテナンス性に優れたシール装置を提供することができる。
請求項２の発明によれば、後段からの雰囲気ガス供給が存在する場合でも、シール効果の高いシール装置を提供することができる。
請求項３の発明によれば、複数のシール装置を連続的に設けたことにより、さらにシール効果の高いシール装置を提供することができる。
According to the invention of claim 1, in the continuous annealing furnace equipped with the floater equipment, the floater equipment is used as the sealing device. Therefore, the sealing device is less expensive than the conventional structure and has excellent durability and maintainability. Can be provided.
According to the invention of
According to the invention of claim 3, by providing a plurality of sealing devices continuously, a sealing device having a higher sealing effect can be provided.
本発明者らは、フロータ設備を備えた連続焼鈍炉において、フロータ設備を利用して炉内雰囲気を帯域間で安価にシールする手段について検討した。
そして、複数の吹出口から炉内に吹込まれる雰囲気循環ガスを用いて帯状鋼板を浮揚通板させ、吹込まれた雰囲気循環ガスの一部を吸込口から吸込むことにより雰囲気循環ガスを循環させるフロータ設備を用いて帯状鋼板を通板する際の雰囲気ガスの流れを、実機試験ならびにシミュレーションにより種々検討した結果、雰囲気循環ガスが循環される際に、吸込口より前段側の吹出口から吹込まれた雰囲気ガスが吸込口に吸込まれるまでの圧力損失に応じて、吸込口より前段側の炉圧が変化する、という知見を得た。
本発明は、そのような知見をもとに、さらに吸込口前後の炉圧差を用いてシールする手段について検討した結果なされたものである。
The present inventors examined a means for sealing the atmosphere in the furnace at low cost between zones using the floater equipment in the continuous annealing furnace equipped with the floater equipment.
Then, a floater that circulates the atmosphere circulation gas by causing the strip steel plate to float by using the atmosphere circulation gas blown into the furnace from the plurality of outlets and sucking a part of the blown atmosphere circulation gas from the suction port As a result of various examinations of the flow of the atmosphere gas when passing the strip steel plate using the equipment by actual machine tests and simulations, when the atmosphere circulation gas was circulated, it was blown from the outlet on the upstream side from the suction port The knowledge that the furnace pressure of the front | former stage side from an inlet port changes according to the pressure loss until atmospheric gas is inhaled by an inlet port was acquired.
The present invention has been made as a result of studying means for sealing using a furnace pressure difference before and after the suction port based on such knowledge.
以下、本発明のシール装置の実施の形態について具体的に説明する。
図１は、フロータ設備１の複数の吹出口２ａ〜２ｉから吹込まれる雰囲気循環ガスを用いて帯状鋼板（図示せず）を浮揚通板させ、雰囲気循環ガスの一部を吸込口４から吸込むことにより雰囲気循環ガスを循環させる装置構成において、吸込口４の位置によって、吸込口前後の炉圧分布１０が変化することを説明するための模式図である。
図1は、炉の通板長手方向（通板方向は図中矢印に示す）の側面図であり、各吹出口からの吹出し風量の大きさを２ａ〜２ｉの矢印の長さで示し、通板長手方向の炉圧分布を炉圧分布１０として示す。また、２ａから２ｇの炉圧差をΔｐ１、２ｉと２ｇの炉圧差をΔｐ２とする。
Hereinafter, embodiments of the sealing device of the present invention will be specifically described.
FIG. 1 shows that a strip-shaped steel plate (not shown) is floated using atmospheric circulation gas blown from a plurality of
FIG. 1 is a side view in the longitudinal direction of the passage of the furnace (the passage direction is indicated by an arrow in the figure), and the amount of air blown from each outlet is indicated by the length of the
吸込口４が、図１の位置にある場合、前段側端末の吹出口２ａから吸込口直近の吹出口２ｇまでの圧力差ΔＰ１は、後段側端末の吹出口２ｉから吸込口直近の吹出口２ｈまでの圧力差ΔＰ２よりも大きくなり、吸込口より前段側の炉圧が後段側の炉圧より高くなる。
When the suction port 4 is located at the position shown in FIG. 1, the pressure difference ΔP1 from the
このように吸込口後段側の炉圧が前段側よりも低くなることにより、炉の後段側からの雰囲気ガスの流入が促進され、さらに炉の前段側の炉圧を高めることにより、帯状鋼板が炉の前段の帯域から随伴して持ち込む雰囲気ガスを炉圧によって押さえ込むことができ、前段の雰囲気を効果的にシールすることができる。 In this way, the furnace pressure on the rear stage side of the suction port is lower than that on the front stage side, which facilitates the inflow of atmospheric gas from the rear stage side of the furnace, and further increases the furnace pressure on the front stage side of the furnace, thereby The atmosphere gas brought in from the zone at the front stage of the furnace can be suppressed by the furnace pressure, and the atmosphere at the front stage can be effectively sealed.
上記のように、シール効果を得るためには、ΔＰ１−ΔＰ２の値が０より大きいことが必要である。そのためには、前段側端末の吹出口から後段側に向かって各吹出口の雰囲気循環ガス流量を順次積算した積算値が、前記吸込口から吸込むガス流量の１／２を超える位置よりも後段側に前記吸込口を配置することが少なくとも必要である。それにより、後段側の雰囲気循環ガス流量の積算値は、吸込むガス流量の１／２以下になり、ΔＰ１−ΔＰ２＞０を達成することができる。 As described above, in order to obtain the sealing effect, the value of ΔP1−ΔP2 needs to be larger than zero. For this purpose, the integrated value obtained by sequentially integrating the atmospheric circulation gas flow rate of each air outlet from the air outlet of the front side terminal toward the rear side is more downstream than the position where it exceeds 1/2 of the gas flow rate sucked from the air inlet. It is at least necessary to arrange the suction port. Thereby, the integrated value of the atmospheric circulation gas flow rate on the rear stage side becomes 1/2 or less of the suction gas flow rate, and ΔP1−ΔP2> 0 can be achieved.
さらに、帯状鋼板の移動にともなう随伴流以外の雰囲気ガスの流入をできるだけ抑えるためには、シール装置前後に仕切板６を配置することが必要である。
本発明は、この仕切板の設置と上記のような吸込口の位置の調整によって大きなシール効果を得ることができる。
Furthermore, in order to suppress the inflow of atmospheric gas other than the accompanying flow accompanying the movement of the strip steel plate as much as possible, it is necessary to arrange the
The present invention can obtain a great sealing effect by installing the partition plate and adjusting the position of the suction port as described above.
なお、吸込口の位置は、前段側端末の吹出口から後段側に向かって各吹出口の雰囲気循環ガス流量を順次積算した積算値が、前記吸込口から吸込むガス流量を超える位置よりも後段側に前記吸込口を配置すれば、さらにシール効果を高めることができるが、特に、吸込口が前記複数の吹出口の何れよりも後段側、すなわち、フロータ設備の後段側端末の吹出口（図１では２ｉ）と後段側の仕切板の間に吸込口を、特に仕切板近傍に配置すると、吸込口より前段側の炉圧を大きく高めるため、高いシール効果を得ることができる。
また、後段から雰囲気ガスが供給される場合は、図１の２ａから２ｂに記載のとおり装置前段では後段から供給された雰囲気ガスが、前段に流出しようとする際の圧力損失が生じるため、炉の前段の炉圧を後段の炉圧より高めるためには、前記積算値から後段からの雰囲気ガスの供給量Ｑ１を差し引いた値が、前記吸込口から吸込むガス流量の１／２を超える位置よりも後段側に前記吸込口を配置することが必要である。
In addition, the position of the suction port is the rear side of the position where the integrated value obtained by sequentially integrating the atmospheric circulation gas flow rate of each outlet from the blower outlet of the front side terminal toward the rear side exceeds the gas flow rate sucked from the suction port. Although the sealing effect can be further enhanced by disposing the suction port on the air outlet, in particular, the suction port is located on the rear side of any of the plurality of air outlets, that is, the air outlet of the rear side terminal of the floater facility (FIG. 1). Then, if the suction port is arranged between 2i) and the partition plate on the rear stage side, particularly in the vicinity of the partition plate, the furnace pressure on the front stage side from the suction port is greatly increased, so that a high sealing effect can be obtained.
In addition, when the atmospheric gas is supplied from the latter stage, as shown in 2a to 2b of FIG. 1, the atmospheric gas supplied from the latter stage in the front stage of the apparatus causes a pressure loss when trying to flow out to the former stage. In order to increase the pre-stage furnace pressure from the post-stage furnace pressure, the value obtained by subtracting the supply amount Q1 of the atmospheric gas from the post-stage from the integrated value exceeds a position where the gas flow rate sucked from the suction port exceeds 1/2. It is necessary to arrange the suction port on the rear side.
本発明では、吹出口の数、雰囲気循環ガス流量など特に限定されるものではないが、複数の吹出口を合わせた全長が２ｍ以上、雰囲気循環ガスの流量が１００ｍ３／ｍｉｎ以上、後段からの雰囲気ガス流入量が２００Ｎｍ３／ｈｒ以上の条件において、好適に実施できる。 In the present invention, the number of outlets and the flow rate of the atmosphere circulation gas are not particularly limited. However, the total length of the plurality of blower outlets is 2 m or more, and the flow rate of the atmosphere circulation gas is 100 m 3 / min or more. It can be suitably carried out under the condition where the atmospheric gas inflow is 200 Nm 3 / hr or more.
さらに、本発明では、複数のフロータ設備を連続的に設け、各フロータ設備の前後に仕切板を配置し、各フロータ設備に対応する吸込口を上記のような位置に設けるようにすれば、さらに高いシール効果を得ることができる。その場合、仕切板は、連続するフロータ設備全体の前後と各フロータ設備間に配置すればよい。また、各フロータ設備に対応して設けられる吸込口の位置は、すべてのフロータ設備に対して同じであっても、異なっていてもよい。後段側のフロータ設備では、よりシール効果の高い後段側の仕切板に近い位置に配置するのが好ましい。 Furthermore, in the present invention, if a plurality of floater facilities are provided continuously, a partition plate is arranged before and after each floater facility, and a suction port corresponding to each floater facility is provided at the above position, A high sealing effect can be obtained. In that case, what is necessary is just to arrange | position a partition plate before and behind each continuous floater installation, and between each floater installation. Moreover, the position of the suction inlet provided corresponding to each floater installation may be the same with respect to all the floater installations, or may differ. In the latter-stage floater equipment, it is preferable to arrange the floater equipment at a position close to the latter-stage partition plate having a higher sealing effect.
次に、本発明のシール装置を、連続焼鈍炉の加熱帯後段の冷却帯に適用した実施の態様について説明する。
図２は連続焼鈍炉５の一部を示しており、Ａ室は輻射管式加熱帯、Ｂ、Ｃ室は冷却帯、Ｄ室は急速冷却帯となっており、各室間は仕切板６で仕切られている。
Ａ室では帯状鋼板３が１０００℃まで加熱され、Ｃ室後段までに８００℃に冷却される。ハースロールでの押疵を防止するため、Ａ室からＣ室まではフロータ設備１から噴出される雰囲気循環ガスで浮揚支持され、Ｄ室以降はハースロール７で支持されている。
Next, an embodiment in which the sealing device of the present invention is applied to a cooling zone after the heating zone of the continuous annealing furnace will be described.
FIG. 2 shows a part of the
In the A chamber, the strip steel plate 3 is heated to 1000 ° C. and cooled to 800 ° C. by the latter stage of the C chamber. In order to prevent crushing at the hearth roll, the chamber A to the chamber C are floated and supported by the atmosphere circulating gas ejected from the floater equipment 1, and the chamber D and the following are supported by the hearth roll 7.
Ａ室では、鋼板の還元と酸化防止のため、雰囲気のＨ２濃度を３０％としているが、Ｄ室以降は炉温が低いため、水素爆発の防止の観点からＨ２濃度を１％以下とする必要がある。
Ａ室から後段への水素流出を防止するため、冷却帯をＢ室とＣ室に分け、それぞれにシール装置を設けた。シール装置は、前記仕切板６とフロータ設備１と吸込口４およびフロータ設備１間を接続する耐熱性のある循環ファン８で構成され、後段側の吸込口４から雰囲気循環ガスを吸込み、ガスクーラー９で所定温度まで冷却した後、フロータ設備１の吹出口２より雰囲気循環ガスを吹込み、鋼板の冷却と浮揚支持も同時に行えるものとした。
In room A, the H 2 concentration in the atmosphere is set at 30% to reduce and prevent oxidation of the steel sheet. However, since the furnace temperature is low after room D, the H 2 concentration is set to 1% or less from the viewpoint of preventing hydrogen explosion. There is a need to.
In order to prevent hydrogen from flowing out from the A chamber to the subsequent stage, the cooling zone was divided into the B chamber and the C chamber, and a sealing device was provided for each. The sealing device is composed of a heat-resistant circulation fan 8 that connects the
この装置では、吹出口の数は70個とし、B室、C室の長さは４．５ｍ、Ｌ：フロータ設備両端の吹出口間の距離、ａ：吹出口前段側端末から吸込口前端までの距離、ｂ：吸込口の全長、ｈ：吹出口後段側端末から仕切板までの距離は、それぞれＬ＝３．５ｍ、ａ＝２．５ｍ、ｂ＝０．５ｍ、ｈ＝１．０ｍとなるように吹出口と吸込口を配置した。
また、吸込口から吸込むガス流量を４５０ｍ３／ｍｉｎと設定したときの、この装置における前段側端末の吹出口から積算した雰囲気循環ガス流量の積算値が、前記吸込口から吸込むガス流量の１／２を超える吹出口位置は前段の仕切板から２．２５ｍであり、前記積算値から、後段からの雰囲気ガス供給量Ｑ１を差し引いた値が、前記吸込口から吸込むガス流量の１／２を超える吹出口位置は前段の仕切板から２．５ｍであり、吸込口はそれらの位置より後方に設けられている。
In this device, the number of outlets is 70, the length of B room and C room is 4.5 m, L: distance between the outlets at both ends of the floater equipment, a: from the outlet front stage end to the inlet front end , B: total length of the suction port, h: distances from the outlet side terminal to the partition plate are L = 3.5 m, a = 2.5 m, b = 0.5 m, and h = 1.0 m, respectively. The blower outlet and the suction inlet were arrange | positioned so that it might become.
In addition, when the gas flow rate sucked from the suction port is set to 450 m 3 / min, the integrated value of the atmospheric circulation gas flow rate accumulated from the blower outlet of the front side terminal in this apparatus is 1 / of the gas flow rate sucked from the suction port. The outlet position exceeding 2 is 2.25 m from the front partition plate, and the value obtained by subtracting the atmospheric gas supply amount Q1 from the subsequent stage from the integrated value exceeds 1/2 of the gas flow rate sucked from the suction port. A blower outlet position is 2.5 m from the partition plate of the front | former stage, and the suction inlet is provided in the back from those positions.
そして、後段からの雰囲気ガス量Ｑ１＝４５０Ｎｍ３／ｈｒ、各室の雰囲気循環ガス流量Ｑ２＝４５０ｍ３／ｍｉｎとなるように雰囲気循環ガスを循環させたところ、Ａ〜Ｃの各室内で３Ｐａの炉圧差が生じ、これによりＨ２濃度は、Ｂ室で３％、Ｃ室で０.３％となり、冷却帯に連続的に２つのシール装置を設けたことにより、目的のシール性能を得ることができた。
また、引用文献４と比較すると、炉内の上部風箱、風箱の吊り金物や昇降装置が不要となり、シール装置の炉内構造物の費用は引用文献４の場合と比較して約１／２とすることができた。
Then, when the atmospheric circulation gas was circulated so that the atmospheric gas amount Q1 = 450 Nm 3 / hr from the subsequent stage and the atmospheric circulation gas flow rate Q2 = 450 m 3 / min in each chamber, 3 Pa in each of the chambers A to C was obtained. A furnace pressure difference is generated, and the H 2 concentration becomes 3% in the B chamber and 0.3% in the C chamber. By providing two sealing devices in the cooling zone continuously, the desired sealing performance can be obtained. I was able to.
Further, compared with the cited document 4, the upper wind box in the furnace, the hanging hardware of the wind box and the lifting device are not required, and the cost of the in-furnace structure of the sealing device is about 1 / compared with that of the cited document 4. 2 could be achieved.
なお、この実施の形態においては、フロータ設備を帯状鋼板下側にだけ配置した例を示したが、鋼板上側にも対象的にフロータ設備を設けて、帯状鋼板を上下から浮揚支持して通板させるようにしてもよいことはもちろんであり、シール効果の点では、上側にもフロータ設備を設けるのが望ましい。 In this embodiment, an example is shown in which the floater equipment is arranged only on the lower side of the strip steel plate. However, the floater equipment is also provided on the upper side of the steel plate, and the strip steel plate is floated and supported from above and below. Needless to say, it is desirable to provide a floater equipment on the upper side in terms of the sealing effect.
以上説明した実施の形態は本発明の例であり、本発明は、該実施の形態により制限されるものではなく、特許請求の範囲の請求項に記載される事項によってのみ規定されており、上記以外の実施の形態も実施可能である。 The embodiment described above is an example of the present invention, and the present invention is not limited by the embodiment, and is defined only by matters described in the claims of the claims. Other embodiments can also be implemented.
１ フロータ設備
２ 雰囲気循環ガスの吹出口
３ 帯状鋼板
４ 雰囲気循環ガスの吸込口
５ 連続焼鈍炉
６ 仕切板
７ ハースロール
８ 循環ファン
９ ガスクーラー
１０ 炉圧分布
DESCRIPTION OF SYMBOLS 1
Claims (3)
前記フロータ設備の前後に仕切板を配置し、フロータ設備の前段側端末の吹出口から後段側に向かって各吹出口の雰囲気循環ガス流量を順次積算した積算値が、前記吸込口から吸込むガス流量の１／２を超える位置と後段側の仕切板の間に前記吸込口を配置したことにより、仕切板前段から後段への雰囲気ガスの流入を抑制することを特徴とするシール装置。 A seal in a continuous annealing furnace that circulates the atmospheric circulation gas by levitation of the strip steel plate using atmospheric circulation gas blown from a floater facility having a plurality of outlets and sucking a part of the atmospheric circulation gas from the intake port A device,
A partition plate is arranged before and after the floater facility, and an integrated value obtained by sequentially integrating the atmospheric circulation gas flow rate of each blower outlet from the blower outlet of the front-end side terminal of the floater facility toward the rear-stage side is the gas flow rate sucked from the suction port A sealing device characterized by suppressing the inflow of atmospheric gas from the front stage of the partition plate to the rear stage by arranging the suction port between a position exceeding 1/2 of the first partition plate and the rear stage partition plate.
前記フロータ設備を複数個連続的に設けるとともに、仕切板を各フロータ設備の前後に位置するように配置し、各フロータ設備において、フロータ設備の前段側端末の吹出口から後段側に向かって各吹出口の雰囲気循環ガス流量を順次積算した積算値、あるいは、該積算値から後段からの雰囲気ガス流入量を差し引いた量が、前記吸込口から吸込むガス流量の１／２を超える位置と後段側の仕切板の間に前記吸込口を配置したことにより、仕切板前段から後段への雰囲気ガスの流入を抑制することを特徴とするシール装置。 A seal in a continuous annealing furnace that circulates the atmospheric circulation gas by levitation of the strip steel plate using atmospheric circulation gas blown from a floater facility having a plurality of outlets and sucking a part of the atmospheric circulation gas from the intake port A device,
A plurality of the floater facilities are continuously provided, and the partition plates are arranged so as to be positioned in front of and behind each floater facility, and in each floater facility, each blower is directed from the outlet of the terminal on the front side of the floater facility toward the rear side. The integrated value obtained by sequentially integrating the atmospheric circulation gas flow rate at the outlet, or the amount obtained by subtracting the atmospheric gas inflow rate from the subsequent stage from the integrated value exceeds the half of the gas flow rate sucked from the suction port and the rear stage side. A sealing device characterized by suppressing the inflow of atmospheric gas from the front stage to the rear stage of the partition plate by disposing the suction port between the partition plates.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63103027A (en) * | 1986-10-20 | 1988-05-07 | Mitsubishi Heavy Ind Ltd | Non-contacting gas sealing apparatus |
| JPH10306328A (en) * | 1997-04-28 | 1998-11-17 | Nippon Steel Corp | Continuous annealing furnace |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63103027A (en) * | 1986-10-20 | 1988-05-07 | Mitsubishi Heavy Ind Ltd | Non-contacting gas sealing apparatus |
| JPH10306328A (en) * | 1997-04-28 | 1998-11-17 | Nippon Steel Corp | Continuous annealing furnace |
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