JP2015031487A - Atmosphere heat treatment furnace - Google Patents

Atmosphere heat treatment furnace Download PDF

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JP2015031487A
JP2015031487A JP2013163339A JP2013163339A JP2015031487A JP 2015031487 A JP2015031487 A JP 2015031487A JP 2013163339 A JP2013163339 A JP 2013163339A JP 2013163339 A JP2013163339 A JP 2013163339A JP 2015031487 A JP2015031487 A JP 2015031487A
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furnace
heat treatment
atmosphere
atmosphere gas
treatment furnace
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JP6007870B2 (en
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富永　健一
Kenichi Tominaga
健一 富永
泰成 古賀
Yasunari Koga
泰成 古賀
崇 土居
Takashi Doi
崇 土居
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JFE Steel Corp
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Abstract

PROBLEM TO BE SOLVED: To perform an efficient diffusion of air and moisture left in a furnace inner space out of a furnace due to a presence of furnace wall refractory without changing temperature and flow rate of atmosphere gas.SOLUTION: A purge device 1 comprises a plurality of atmosphere gas feeding ports 2 for feeding atmosphere gas from the outer-most surface of a furnace inner space side of a furnace wall refractory 4 forming a furnace wall W of an atmosphere heat treatment furnace toward a furnace inner space A, and the number of the atmosphere gas feeding ports 2 per unit volume of the furnace inner space A is one piece/mor more. It is preferable that the atmosphere gas feeding ports 2 feed atmosphere gas toward a plurality of directions slanted with respect to the furnace wall W. In addition, it is also preferable that the atmosphere gas feeding ports 2 adjacent to each other in a direction perpendicular to an advancing direction S of a material to be treated are arranged on separate planes perpendicular to the advancing direction S of the material to be treated in the furnace inner space A.

Description

本発明は、薄板鋼板や厚板鋼板などの被処理材を熱処理する雰囲気熱処理炉であって、炉内に残留するガスを炉外に放散する雰囲気熱処理炉に関する。   The present invention relates to an atmospheric heat treatment furnace for heat-treating a material to be treated such as a thin steel plate or a thick steel plate, and relates to an atmospheric heat treatment furnace that diffuses a gas remaining in the furnace to the outside of the furnace.

一般に、鋼帯の連続熱処理炉や金属製品の雰囲気熱処理炉（焼鈍炉）では、炉内での被処理材の酸化を極力防止するため、炉内雰囲気ガスとして非酸化性もしくは還元性のガスが使用される。例えば、鋼帯の連続熱処理炉では、通常、炉内雰囲気ガスとしてＨ２とＮ２の混合ガスが使用される。 In general, in a continuous heat treatment furnace for steel strips and an atmosphere heat treatment furnace (annealing furnace) for metal products, a non-oxidizing or reducing gas is used as the atmosphere gas in the furnace in order to prevent oxidation of the material to be treated in the furnace as much as possible. used. For example, in a continuous heat treatment furnace for steel strip, a mixed gas of H 2 and N 2 is usually used as the atmosphere gas in the furnace.

ところで、雰囲気熱処理炉の炉壁には、従来、レンガ系耐火物や不定形耐火物が用いられてきたが、最近は、これらに代わり断熱性の高いファイバー系耐火物の使用比率が高まっている。このファイバー系耐火物は極細の繊維状物質からなり、気孔率が高く優れた断熱性を有する。しかしながら、このファイバー系耐火物は、気孔率が高い故に空気や水分を吸収し易い。そのため、雰囲気熱処理炉の建設直後や補修あるいは点検の際に雰囲気熱処理炉を大気開放すると、その内部に大量の空気や水分を吸収した状態になる。また、雰囲気熱処理炉の建設や炉壁の修理の際には、炉壁を形成する炉壁耐火物を接合するために水分を多く含んだバインダーが使用されるため、大気中の水分や空気に加えバインダーの水分も炉壁耐火物の内部に吸収される。   By the way, brick-based refractories and irregular-shaped refractories have been used for the furnace wall of the atmosphere heat treatment furnace, but recently, the use ratio of fiber-based refractories with high heat insulation is increasing instead. . This fiber-based refractory is made of an extremely fine fibrous material and has a high porosity and excellent heat insulation. However, since this fiber-based refractory has a high porosity, it easily absorbs air and moisture. Therefore, when the atmosphere heat treatment furnace is opened to the atmosphere immediately after construction of the atmosphere heat treatment furnace or during repair or inspection, a large amount of air or moisture is absorbed in the inside. In addition, when constructing an atmospheric heat treatment furnace or repairing a furnace wall, a binder containing a large amount of moisture is used to join the furnace wall refractories that form the furnace wall. In addition, moisture in the binder is also absorbed inside the furnace wall refractory.

雰囲気熱処理炉の操業では、操業開始時に炉内に残留するガスを炉外に放散（パージ）する。その際、上記のような炉壁耐火物に保持されている空気や水分も炉外に放散する必要がある。従来、炉の開放後に再び操業を開始する際には、雰囲気ガスを炉内空間に直接送気している。しかしながら、この方法では、炉壁耐火物の内部に入り込んだ空気や水分はなかなか抜け難い。また、最近では、炉体表面からの放散熱量を低減するために、炉壁に断熱性に優れた断熱材が使用され、炉壁の外表面（鉄皮表面）の温度が８０℃程度以下に保たれるようにしている。そのため、特に鉄皮内面近傍の炉壁耐火物に残留した水分は蒸発気化され難く、炉内の酸素濃度や露点を低下させるために著しく長時間を要する。例えば、雰囲気ガスとして、露点が−７０℃、含有酸素濃度が０．０５ｐｐｍである高純度のＮ２を炉内空間に直接送気しても、ほとんどの場合、３０日経過後の炉内の酸素濃度は２０〜３０ｐｐｍ、露点は−３０℃程度であった。このように酸素濃度と露点とがなかなか低下しないのは、炉壁耐火物の内部に残留している空気や水分が拡散により少しずつ炉内空間に出てくるためである。 In the operation of the atmospheric heat treatment furnace, the gas remaining in the furnace at the start of the operation is diffused (purged) outside the furnace. At that time, it is necessary to dissipate the air and moisture held in the furnace wall refractory as described above to the outside of the furnace. Conventionally, when the operation is started again after the furnace is opened, the atmospheric gas is directly supplied to the furnace space. However, in this method, it is difficult to remove air and moisture that have entered the furnace wall refractory. Recently, in order to reduce the amount of heat dissipated from the surface of the furnace body, a heat insulating material having excellent heat insulating properties is used for the furnace wall, and the temperature of the outer surface (iron skin surface) of the furnace wall is about 80 ° C. or less. To keep it. For this reason, the water remaining in the furnace wall refractory near the inner surface of the iron shell is not easily evaporated and takes a long time to reduce the oxygen concentration and dew point in the furnace. For example, even if high purity N 2 having a dew point of −70 ° C. and an oxygen concentration of 0.05 ppm is directly fed into the furnace space as the atmospheric gas, in most cases, the oxygen in the furnace after 30 days has passed. The concentration was 20 to 30 ppm, and the dew point was about −30 ° C. The reason why the oxygen concentration and the dew point do not decrease as described above is that air and moisture remaining in the furnace wall refractory gradually come out into the furnace space due to diffusion.

そこで、例えば特許文献１には、炉壁耐火物から炉内空間に向けて温度が５０〜１２０℃の雰囲気ガスを送気して、この雰囲気ガスに炉壁耐火物の内部に残留した空気および水分を随伴させて炉内空間側に排出する技術が開示されている。   Therefore, for example, in Patent Document 1, an atmosphere gas having a temperature of 50 to 120 ° C. is sent from the furnace wall refractory toward the furnace space, and the air remaining in the furnace wall refractory in the atmosphere gas and A technique for discharging moisture to the space inside the furnace is disclosed.

特開平７−１７３５２６号公報Japanese Unexamined Patent Publication No. 7-173526

しかしながら、特許文献１に記載されているように送気する雰囲気ガスの温度を５０〜１２０℃にするには、加熱装置が必要とされるため、設備導入費用が嵩むという問題があった。また、特許文献１に記載の技術では、炉内の雰囲気ガスの流動状態が十分に把握されておらず、雰囲気ガスを炉内空間に向けて送気する雰囲気ガス投入口のレイアウトは経験的に決められているに過ぎない。そのため、特許文献１に記載の技術によって炉壁耐火物に保持されている空気や水分を十分に炉外に放散できるとは言い難く、改善の余地が残されている。   However, since the heating device is required to set the temperature of the atmospheric gas to be supplied to 50 to 120 ° C. as described in Patent Document 1, there is a problem that the equipment introduction cost increases. Further, in the technique described in Patent Document 1, the flow state of the atmospheric gas in the furnace is not sufficiently grasped, and the layout of the atmospheric gas inlet for supplying the atmospheric gas toward the furnace space is empirically determined. It is only decided. Therefore, it is difficult to say that the air and moisture held in the furnace refractory can be sufficiently dissipated outside the furnace by the technique described in Patent Document 1, and there is still room for improvement.

本発明は、上記に鑑みてなされたものであって、雰囲気ガスの温度や流量を変更せずに炉壁耐火物に起因して炉内空間に残留する空気や水分を効率よく炉外に放散できる雰囲気熱処理炉を提供することを目的とする。   The present invention has been made in view of the above, and efficiently diffuses air and moisture remaining in the furnace space due to the furnace wall refractory without changing the temperature and flow rate of the atmospheric gas. An object of the present invention is to provide an atmosphere heat treatment furnace.

上述した課題を解決し、目的を達成するために、本発明に係る雰囲気熱処理炉は、被処理材を熱処理する雰囲気熱処理炉の操業開始時に、炉内空間に残留する空気や水分を雰囲気ガスに置換して炉外に放散する雰囲気熱処理炉であって、雰囲気熱処理炉の炉壁を形成する炉壁耐火物の炉内空間側の最外表面から炉内空間に向けて雰囲気ガスを送気する複数の雰囲気ガス投入口を備え、炉内空間の単位体積当たりの前記雰囲気ガス投入口の数が１個／ｍ３以上であることを特徴とする。 In order to solve the above-described problems and achieve the object, the atmosphere heat treatment furnace according to the present invention uses air or moisture remaining in the furnace space as an atmosphere gas at the start of operation of the atmosphere heat treatment furnace for heat-treating the material to be treated. An atmosphere heat treatment furnace that replaces and dissipates outside the furnace, and sends atmospheric gas from the outermost surface on the furnace space side of the furnace wall refractory forming the furnace wall of the atmosphere heat treatment furnace toward the furnace space A plurality of atmosphere gas inlets are provided, and the number of the atmosphere gas inlets per unit volume of the furnace space is 1 / m 3 or more.

また、本発明に係る雰囲気熱処理炉は、上記発明において、前記雰囲気ガス投入口は、炉壁に対して斜めとなる複数の方向に雰囲気ガスを送気することを特徴とする。   Moreover, the atmosphere heat treatment furnace according to the present invention is characterized in that, in the above invention, the atmosphere gas inlet feeds the atmosphere gas in a plurality of directions oblique to the furnace wall.

また、本発明に係る雰囲気熱処理炉は、上記発明において、隣り合う前記雰囲気ガス投入口は、炉内空間における被処理材の進行方向に直交する別々の面上に設けられていることを特徴とする。   Moreover, the atmospheric heat treatment furnace according to the present invention is characterized in that, in the above invention, the adjacent atmosphere gas inlets are provided on different surfaces orthogonal to the traveling direction of the material to be processed in the furnace space. To do.

本発明によれば、雰囲気ガスの温度や流量を変更せずに炉壁耐火物に起因して炉内空間に残留する空気や水分を効率よく炉外に放散できる。   According to the present invention, air and moisture remaining in the furnace space due to the furnace wall refractory can be efficiently diffused outside the furnace without changing the temperature and flow rate of the atmospheric gas.

図１は、本発明の一実施形態に係る雰囲気熱処理炉の概略構成を示す模式図である。FIG. 1 is a schematic diagram showing a schematic configuration of an atmospheric heat treatment furnace according to an embodiment of the present invention. 図２は、単位体積当たりの雰囲気ガス投入口の数と必要パージ時間との関係を例示する図である。FIG. 2 is a diagram illustrating the relationship between the number of atmospheric gas inlets per unit volume and the required purge time. 図３は、従来の雰囲気熱処理炉の概略構成を例示する図である。FIG. 3 is a diagram illustrating a schematic configuration of a conventional atmospheric heat treatment furnace.

以下、図面を参照して、本発明の一実施形態である雰囲気熱処理炉について説明する。なお、この実施の形態により本発明が限定されるものではない。また、図面の記載において、同一部分には同一の符号を付して示している。   Hereinafter, an atmosphere heat treatment furnace according to an embodiment of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment. Moreover, in description of drawing, the same code | symbol is attached | subjected and shown to the same part.

まず、図１を参照して、本発明の一実施形態である雰囲気熱処理炉の概略構成について説明する。図１に示すように、本実施の形態の雰囲気熱処理炉１は、複数の雰囲気ガス投入口２が配設された雰囲気ガス送気配管３と、図示しない制御装置とを備える。   First, a schematic configuration of an atmospheric heat treatment furnace according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the atmospheric heat treatment furnace 1 according to the present embodiment includes an atmospheric gas supply pipe 3 in which a plurality of atmospheric gas inlets 2 are disposed, and a control device (not shown).

雰囲気ガス送気配管３は、図１に白抜き矢印で示す被処理材の進行方向Ｓに沿って、雰囲気熱処理炉の炉壁Ｗを形成する炉壁耐火物４の炉内空間Ａ側の最外面上に、複数本配設されている。各雰囲気ガス送気配管３には、複数の雰囲気ガス投入口２が設けられている。   The atmosphere gas air supply pipe 3 is arranged at the outermost space A side of the furnace wall refractory 4 of the furnace wall refractory 4 that forms the furnace wall W of the atmosphere heat treatment furnace along the traveling direction S of the material to be processed indicated by the white arrow in FIG. A plurality of lines are arranged on the outer surface. Each atmosphere gas supply pipe 3 is provided with a plurality of atmosphere gas inlets 2.

制御装置は、ワークステーションやパーソナルコンピュータなどの情報処理装置によって構成され、炉内空間Ａ内への雰囲気ガスの送気を制御する。   The control device is constituted by an information processing device such as a workstation or a personal computer, and controls the supply of atmospheric gas into the furnace space A.

ここで、本実施の形態では、炉内空間Ａ側の最外表面に雰囲気ガス送気配管３を配設して雰囲気ガス投入口２の数を容易に加減できることから、雰囲気ガス投入口２は、炉内空間Ａの単位体積当たりの数が１個／ｍ３以上となるように設けられている。これに対し、例えば特許文献１に記載された従来の雰囲気熱処理炉では、雰囲気ガス投入口は炉壁Ｗの外側に経験的にレイアウトされ、その炉内空間の単位体積当たりの数は０．３個／ｍ３程度であった。本実施の形態により、炉壁耐火物４の内部に残留した空気や水分の流動状態が良くなり、炉内空間Ａ側に排出されやすくなる。したがって、雰囲気ガスの温度を上げたり、雰囲気ガスの流量を増加させたりすることなく、パージに必要な時間を短縮できる。さらに、雰囲気ガス投入口２の数が増加したことにより、雰囲気ガス投入口２が異物の詰まりにより閉鎖された場合にも、雰囲気熱処理炉１全体のパージ効率が落ちるリスクを低減できる。 Here, in the present embodiment, since the atmosphere gas supply pipe 3 is provided on the outermost surface on the furnace space A side and the number of the atmosphere gas input ports 2 can be easily adjusted, The number per unit volume of the furnace space A is set to 1 piece / m 3 or more. On the other hand, in the conventional atmosphere heat treatment furnace described in Patent Document 1, for example, the atmosphere gas inlet is empirically laid out outside the furnace wall W, and the number of unit spaces in the furnace space is 0.3. The number was about 3 / m 3 . According to the present embodiment, the flow state of air and moisture remaining inside the furnace wall refractory 4 is improved, and is easily discharged to the furnace space A side. Therefore, the time required for purging can be shortened without increasing the temperature of the atmospheric gas or increasing the flow rate of the atmospheric gas. Furthermore, the increase in the number of the atmospheric gas inlets 2 can reduce the risk that the purge efficiency of the entire atmospheric heat treatment furnace 1 is lowered even when the atmospheric gas inlets 2 are closed due to clogging of foreign substances.

図２は、単位体積当たりの雰囲気ガス投入口２の数と操業開始前のパージに必要な時間（必要パージ時間）との関係を例示する図である。図２において、従来の雰囲気熱処理炉のように、単位体積当たりの雰囲気ガス投入口の数が０．３個／ｍ３である場合の必要パージ時間を１．００とした。これに対し、単位体積当たりの雰囲気ガス投入口２の数が１個／ｍ３の雰囲気熱処理炉１による必要パージ時間は０．８０であった。また、単位体積当たりの雰囲気ガス投入口２の数が２．５個／ｍ３の雰囲気熱処理炉１による必要パージ時間も０．８０となった。これにより、単位体積当たりの雰囲気ガス投入口２の数を１個／ｍ３以上とすれば、必要パージ時間を短縮できることがわかる。 FIG. 2 is a diagram illustrating the relationship between the number of atmospheric gas inlets 2 per unit volume and the time required for purging before starting operation (necessary purge time). In FIG. 2, the required purge time when the number of atmosphere gas inlets per unit volume is 0.3 / m 3 as in a conventional atmosphere heat treatment furnace is 1.00. On the other hand, the purge time required by the atmospheric heat treatment furnace 1 with the number of the atmospheric gas inlets 2 per unit volume being 1 / m 3 was 0.80. In addition, the required purge time by the atmospheric heat treatment furnace 1 in which the number of atmospheric gas inlets 2 per unit volume was 2.5 / m 3 was also 0.80. Accordingly, it can be understood that the required purge time can be shortened if the number of the atmospheric gas inlets 2 per unit volume is 1 / m 3 or more.

また、各雰囲気ガス投入口２の向きは、図１に矢印で示すように、炉壁Ｗに対して斜めに雰囲気ガスを送気するように、複数方向に可変となっている。なお、炉壁Ｗに対して斜めとなる複数の方向に同時に雰囲気ガスを送気可能に構成してもよい。これに対し、例えば特許文献１のような従来の雰囲気熱処理炉では、図３に示すように、雰囲気ガス投入口２の向きは、炉壁Ｗに垂直な方向であった。本実施の形態のように炉壁Ｗに対して斜めに雰囲気ガスを送気することにより、炉内空間Ａの炉壁Ｗ付近の残留ガスの流動性が良くなる。   Further, the direction of each atmospheric gas inlet 2 is variable in a plurality of directions so that the atmospheric gas is supplied obliquely with respect to the furnace wall W as indicated by arrows in FIG. In addition, you may comprise so that atmospheric gas can be sent simultaneously in the several direction which becomes diagonal with respect to the furnace wall W. FIG. On the other hand, in a conventional atmospheric heat treatment furnace such as Patent Document 1, for example, the direction of the atmospheric gas inlet 2 is a direction perpendicular to the furnace wall W as shown in FIG. By supplying the atmospheric gas obliquely to the furnace wall W as in the present embodiment, the fluidity of the residual gas in the vicinity of the furnace wall W in the furnace space A is improved.

また、隣り合う雰囲気ガス投入口２が、被処理材の進行方向Ｓに直交する同一面上に配設されないようにした。本実施の形態では、雰囲気ガス送気配管３の１本おきに、被処理材の進行方向Ｓに直交する同一面上にその雰囲気ガス投入口２を設け、雰囲気熱処理炉１全体の雰囲気ガス投入口２を千鳥配置にした。なお、本発明は、雰囲気ガス送気配管３の配設方向によらず、雰囲気熱処理炉１全体として雰囲気ガス投入口２が千鳥配置になっていればよい。これにより、炉内空間Ａの炉壁Ｗ付近での残留ガスの滞留を抑制でき、パージに必要な時間を短縮できる。   Further, the adjacent atmosphere gas inlets 2 are not arranged on the same plane orthogonal to the traveling direction S of the material to be processed. In the present embodiment, every other atmospheric gas supply pipe 3 is provided with the atmospheric gas inlet 2 on the same plane orthogonal to the traveling direction S of the material to be processed, and the atmospheric gas is supplied to the entire atmospheric heat treatment furnace 1. Mouth 2 is in a staggered arrangement. In the present invention, the atmosphere gas inlets 2 need only be arranged in a staggered manner in the atmosphere heat treatment furnace 1 as a whole, regardless of the arrangement direction of the atmosphere gas supply pipe 3. Thereby, the residence of the residual gas in the furnace wall W vicinity of the furnace space A can be suppressed, and the time required for purge can be shortened.

以上に説明したように、本実施の形態の雰囲気熱処理炉１によれば、炉壁耐火物４の炉内空間Ａ側の最外表面から炉内空間Ａに向けて多数の雰囲気ガス投入口２から雰囲気ガスを送気し、炉壁耐火物４の内部に残留する空気や水分の流動状態を良くして雰囲気ガスに置換して炉内空間Ａに排出させる。そのため、雰囲気ガスの温度を上げたり流量を増加させたりせずにパージに必要な時間を短縮して、炉壁耐火物４に起因して炉内空間に残留する空気や水分を効率よく炉外に放散できる。   As described above, according to the atmosphere heat treatment furnace 1 of the present embodiment, a large number of atmosphere gas inlets 2 from the outermost surface of the furnace wall refractory 4 on the furnace space A side toward the furnace space A. Then, the atmosphere gas is supplied, and the flow state of air and moisture remaining in the furnace wall refractory 4 is improved to be replaced with the atmosphere gas and discharged into the furnace space A. Therefore, the time required for purging is shortened without raising the temperature of the atmospheric gas or increasing the flow rate, and the air and moisture remaining in the furnace space due to the furnace wall refractory 4 are efficiently removed from the outside of the furnace. Can be dissipated.

また、本実施の形態の雰囲気熱処理炉１によれば、炉壁Ｗに対して斜めとなる複数の方向に雰囲気ガスを送気するので、炉内空間Ａの炉壁Ｗ付近の残留ガスの流動状態を良くすることができる。   Further, according to the atmosphere heat treatment furnace 1 of the present embodiment, the atmosphere gas is supplied in a plurality of directions oblique to the furnace wall W, so that the flow of the residual gas in the vicinity of the furnace wall W in the furnace space A The condition can be improved.

また、本実施の形態の雰囲気熱処理炉１によれば、雰囲気ガス投入口２が被処理材の進行方向Ｓに直交する同一断面上に密集していないので、炉内空間Ａの炉壁Ｗ付近の残留ガスの滞留を抑制できる。   Further, according to the atmospheric heat treatment furnace 1 of the present embodiment, the atmosphere gas inlets 2 are not densely arranged on the same cross section orthogonal to the traveling direction S of the material to be processed, so that the vicinity of the furnace wall W in the internal space A Residual gas retention can be suppressed.

上記実施の形態は本発明を実施するための例にすぎず、本発明はこれらに限定されるものではなく、仕様などに応じて種々変形することは本発明の範囲内であり、更に本発明の範囲内において、他の様々な実施の形態が可能であることは上記記載から自明である。   The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited to these embodiments. Various modifications according to specifications and the like are within the scope of the present invention. It is obvious from the above description that various other embodiments are possible within the scope of the above.

［実施例］
板厚が０．１５〜０．５０ｍｍ、板幅が最大で１３００ｍｍの薄板鋼板を処理可能な雰囲気熱処理炉において、雰囲気熱処理炉を補修した後、操業開始前の必要パージ時間を計測した。従来の雰囲気熱処理炉では、単位体積当たりの雰囲気ガス投入口２の数は０．３個／ｍ３であり、酸素濃度および露点が所定の目標値となるまでに５．５日を要した。一方、本実施例の雰囲気熱処理炉１では、単位体積当たりの雰囲気ガス投入口２の数は１個／ｍ３であり、酸素濃度および露点が上記の所定の目標値となるまでに２．７日を要した。これにより、本実施例の雰囲気熱処理炉１によれば、従来の雰囲気熱処理炉と比較して、雰囲気熱処理炉のパージを効率よく行えることが確認できた。 [Example]
In an atmospheric heat treatment furnace capable of treating a thin steel plate having a plate thickness of 0.15 to 0.50 mm and a maximum plate width of 1300 mm, the required purge time before starting operation was measured after repairing the atmospheric heat treatment furnace. In the conventional atmosphere heat treatment furnace, the number of atmosphere gas inlets 2 per unit volume was 0.3 / m 3 , and it took 5.5 days for the oxygen concentration and dew point to reach predetermined target values. On the other hand, in the atmospheric heat treatment furnace 1 of the present embodiment, the number of atmospheric gas inlets 2 per unit volume is 1 / m 3 , and 2.7 until the oxygen concentration and the dew point reach the predetermined target values described above. It took a day. Thereby, according to the atmospheric heat treatment furnace 1 of the present Example, it was confirmed that purging of the atmospheric heat treatment furnace can be performed efficiently as compared with the conventional atmospheric heat treatment furnace.

１ 雰囲気熱処理炉
２ 雰囲気ガス投入口
３ 雰囲気ガス送気配管
４ 炉壁耐火物
Ａ 炉内空間
Ｗ 炉壁 1 Atmospheric heat treatment furnace 2 Atmospheric gas inlet 3 Atmospheric gas supply piping 4 Furnace wall refractory A Furnace space W Furnace wall

Claims (3)

被処理材を熱処理する雰囲気熱処理炉の操業開始時に、炉内空間に残留する空気や水分を雰囲気ガスに置換して炉外に放散する雰囲気熱処理炉であって、
雰囲気熱処理炉の炉壁を形成する炉壁耐火物の炉内空間側の最外表面から炉内空間に向けて雰囲気ガスを送気する複数の雰囲気ガス投入口を備え、
炉内空間の単位体積当たりの前記雰囲気ガス投入口の数が１個／ｍ３以上であることを特徴とする雰囲気熱処理炉。 Atmosphere heat treatment furnace that heats the material to be treated at the start of operation of the atmosphere heat treatment furnace, and replaces air and moisture remaining in the furnace space with atmospheric gas and dissipates outside the furnace,
A plurality of atmospheric gas inlets for supplying atmospheric gas from the outermost surface on the furnace space side of the furnace wall refractory forming the furnace wall of the atmosphere heat treatment furnace to the furnace space,
An atmosphere heat treatment furnace, wherein the number of the atmosphere gas inlets per unit volume of the furnace space is 1 / m 3 or more. 前記雰囲気ガス投入口は、炉壁に対して斜めとなる複数の方向に雰囲気ガスを送気することを特徴とする請求項１に記載の雰囲気熱処理炉。   The atmosphere heat treatment furnace according to claim 1, wherein the atmosphere gas inlet feeds the atmosphere gas in a plurality of directions oblique to the furnace wall. 隣り合う前記雰囲気ガス投入口は、炉内空間における被処理材の進行方向に直交する別々の面上に設けられていることを特徴とする請求項１または２に記載の雰囲気熱処理炉。   The atmosphere heat treatment furnace according to claim 1, wherein the adjacent atmosphere gas inlets are provided on different surfaces orthogonal to the traveling direction of the material to be treated in the furnace space.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59153360U (en) * 1983-03-30 1984-10-15 株式会社東芝 Wire heating furnace
JPS61235680A (en) * 1985-04-10 1986-10-20 株式会社神戸製鋼所 Reducing heat treatment furnace
JPS6236391U (en) * 1985-08-21 1987-03-04
JPH01159588A (en) * 1987-12-14 1989-06-22 Murata Mfg Co Ltd Box for heat treating furnace
JPH02233989A (en) * 1989-03-08 1990-09-17 Ngk Insulators Ltd Tunnel type furnace
JPH07173526A (en) * 1993-12-17 1995-07-11 Nkk Corp Operation of atmosphere heat treatment furnace
JP2002327990A (en) * 2001-04-27 2002-11-15 Daido Steel Co Ltd Seasoning method for atmospheric furnace and atmospheric furnace
JP2005048984A (en) * 2003-07-30 2005-02-24 Ngk Insulators Ltd Heat treatment furnace

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59153360U (en) * 1983-03-30 1984-10-15 株式会社東芝 Wire heating furnace
JPS61235680A (en) * 1985-04-10 1986-10-20 株式会社神戸製鋼所 Reducing heat treatment furnace
JPS6236391U (en) * 1985-08-21 1987-03-04
JPH01159588A (en) * 1987-12-14 1989-06-22 Murata Mfg Co Ltd Box for heat treating furnace
JPH02233989A (en) * 1989-03-08 1990-09-17 Ngk Insulators Ltd Tunnel type furnace
JPH07173526A (en) * 1993-12-17 1995-07-11 Nkk Corp Operation of atmosphere heat treatment furnace
JP2002327990A (en) * 2001-04-27 2002-11-15 Daido Steel Co Ltd Seasoning method for atmospheric furnace and atmospheric furnace
JP2005048984A (en) * 2003-07-30 2005-02-24 Ngk Insulators Ltd Heat treatment furnace

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