JPH06306454A - Method for reusing atmospheric gas in heat treatment furnace - Google Patents
Method for reusing atmospheric gas in heat treatment furnaceInfo
- Publication number
- JPH06306454A JPH06306454A JP11906693A JP11906693A JPH06306454A JP H06306454 A JPH06306454 A JP H06306454A JP 11906693 A JP11906693 A JP 11906693A JP 11906693 A JP11906693 A JP 11906693A JP H06306454 A JPH06306454 A JP H06306454A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- hydrogen
- heat treatment
- atmosphere
- atmospheric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、熱処理炉において雰
囲気ガスとして使用した水素含有ガスの再利用方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reusing a hydrogen-containing gas used as an atmospheric gas in a heat treatment furnace.
【０００２】[0002]
【従来の技術】電磁鋼板、冷延鋼板および表面処理鋼板
の製造工程には、これらの鋼板を還元性雰囲気ガス中で
熱処理するための間接加熱方式、電気加熱方式のバッチ
式焼鈍炉のほか、各種熱処理炉が設けられている。この
還元性雰囲気ガス中における熱処理は、鋼板の材料特性
を適切な特性にすると共に、鋼板表面を清浄にするため
のもので、通常雰囲気ガスとしては、アンモニアを分解
して生じた水素と窒素の混合ガスが使用されている。ま
た、アンモニア分解ガスに窒素ガスを混合して水素濃度
を低くしたガスを使用する炉、あるいは純水素ガスを使
用する炉も用いられている。上記熱処理炉のうちバッチ
式焼鈍炉では、炉内またはマッフル内に雰囲気ガスを導
入しながら、所定の加熱冷却が行われる。導入された雰
囲気ガスは、炉内またはマッフル内の圧力を一定に保ち
ながら、被熱処理鋼板から発生する油、水分、Ｏ2、Ｃ
Ｏ、ＣＯ2により汚染されるため、通常大気中に放出さ
れており、ガス中の水素が有効に利用されていなかっ
た。2. Description of the Related Art In the manufacturing process of electromagnetic steel sheets, cold rolled steel sheets and surface treated steel sheets, in addition to an indirect heating method for heat treating these steel sheets in a reducing atmosphere gas, a batch type annealing furnace of an electric heating method, Various heat treatment furnaces are provided. The heat treatment in this reducing atmosphere gas is for making the material properties of the steel sheet appropriate properties and for cleaning the surface of the steel sheet.Normal atmosphere gas is hydrogen and nitrogen produced by decomposing ammonia. Mixed gas is used. Further, a furnace using a gas in which nitrogen gas is mixed with ammonia decomposition gas to reduce the hydrogen concentration, or a furnace using pure hydrogen gas is also used. In the batch annealing furnace of the above heat treatment furnaces, predetermined heating and cooling are performed while introducing an atmospheric gas into the furnace or muffle. The introduced atmospheric gas keeps the pressure in the furnace or muffle constant, and the oil, moisture, O 2 , C generated from the steel sheet to be heat treated
Since it was polluted by O and CO 2 , it was usually released into the atmosphere, and hydrogen in the gas was not effectively used.
【０００３】上記熱処理炉で使用される雰囲気ガスは、
最近の熱処理鋼板の高級化、表面清浄度の向上に対する
要望に伴い、高純度のものに切り替わっている。このた
め、高純度な雰囲気ガスの大気放散に伴う熱処理コスト
の上昇が大きな問題となってきている。高純度雰囲気ガ
スを使用する熱処理炉におけるガス節減対策としては、
熱処理炉から排出される雰囲気ガスを回収し、精製した
のち再び熱処理炉に循環使用する方法（特開昭６１−７
３８２６号公報、特開昭６２−１７７１２６号公報、特
公昭６２−２１０５０号公報）等が提案されている。ま
た、雰囲気ガスの排出系路で雰囲気ガスの不純物濃度お
よび露点を検出し、これらの検出値が予め設定した基準
値以下になった時点で、雰囲気ガスの排出系路から供給
系路へ雰囲気ガスの一部または全量を還流させる方法
（特開平４−１７６２６号公報）が提案されている。The atmospheric gas used in the above heat treatment furnace is
With the recent demand for higher quality and improved surface cleanliness of heat-treated steel sheets, they have been switched to high purity ones. Therefore, an increase in heat treatment cost due to atmospheric emission of high-purity atmosphere gas has become a serious problem. As a gas saving measure in a heat treatment furnace that uses a high-purity atmosphere gas,
A method of recovering the atmospheric gas discharged from the heat treatment furnace, refining it, and recycling it again in the heat treatment furnace (JP-A-61-7).
3826, JP-A-62-177126, JP-B-62-21050) and the like are proposed. In addition, the impurity concentration and dew point of the atmospheric gas are detected in the atmospheric gas discharge system path, and when these detected values become equal to or lower than the preset reference values, the atmospheric gas is discharged from the atmospheric gas discharge system path to the supply system path. There is proposed a method of refluxing a part or all of the above (Japanese Patent Application Laid-Open No. 4-17626).
【０００４】[0004]
【発明が解決しようとする課題】上記特開昭６１−７３
８２６号公報、特開昭６２−１７７１２６号公報、特公
昭６２−２１０５０号公報ならびに特開平４−１７６２
６号公報に開示の方法は、いずれも雰囲気排ガスの水素
濃度が低下しているような場合、例えば、バッチ式焼鈍
炉において、コイル入替え後窒素ガスによるパージを行
ったのち、雰囲気排ガスとして水素ガスを導入するが、
この時の雰囲気排ガスは窒素を多量に含有しているた
め、水素濃度が低く、循環使用できない。また、焼鈍完
了時には、炉内の水素ガスを窒素ガスでパージを行った
のち、コイル入替を行うため、この時の雰囲気排ガスは
窒素を多量に含有しており、水素濃度が低く、循環使用
できないという問題点を有している。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
826, JP-A-62-177126, JP-B-62-21050 and JP-A-4-1762.
When the hydrogen concentration of the exhaust gas in the atmosphere is low in any of the methods disclosed in Japanese Patent Publication No. 6, for example, after performing coil replacement and purging with nitrogen gas in a batch type annealing furnace, hydrogen gas is used as the exhaust gas in the atmosphere. Will be introduced,
Since the atmospheric exhaust gas at this time contains a large amount of nitrogen, it has a low hydrogen concentration and cannot be circulated. When annealing is completed, hydrogen gas in the furnace is purged with nitrogen gas and then the coil is replaced. Therefore, the atmosphere exhaust gas at this time contains a large amount of nitrogen, and the hydrogen concentration is low, so it cannot be circulated. There is a problem.
【０００５】この発明の目的は、上記鋼板の熱処理にお
いて、雰囲気排ガスの水素濃度が低下している場合にお
いても、雰囲気排ガスを有効に再利用できる熱処理炉雰
囲気ガスの再利用方法を提供することにある。An object of the present invention is to provide a method for reusing the atmosphere gas of a heat treatment furnace which can effectively reuse the atmosphere exhaust gas even when the hydrogen concentration of the atmosphere exhaust gas is lowered in the heat treatment of the steel sheet. is there.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、上記目的
を達成すべく種々試験研究を重ねた。その結果、雰囲気
ガスとして高濃度の水素含有ガスを使用する熱処理炉か
らの雰囲気排ガスのうち、水素濃度が低く循環使用でき
ない雰囲気排ガスは、雰囲気ガス全量の約３割を占める
が、低濃度の水素含有ガスを雰囲気ガスとする熱処理炉
の雰囲気ガスとして再使用できることを究明し、この発
明に到達した。[Means for Solving the Problems] The present inventors have conducted various test studies in order to achieve the above object. As a result, of the atmospheric exhaust gas from the heat treatment furnace that uses a high-concentration hydrogen-containing gas as the atmospheric gas, the atmospheric exhaust gas, which has a low hydrogen concentration and cannot be circulated, accounts for about 30% of the total amount of the atmospheric gas, but the low-concentration hydrogen gas The inventors of the present invention have made clear that they can be reused as the atmosphere gas of a heat treatment furnace in which the contained gas is the atmosphere gas, and have reached the present invention.
【０００７】すなわちこの発明は、水素含有ガスを雰囲
気ガスとして鋼板を熱処理する熱処理炉において、雰囲
気ガスとして高濃度の水素含有ガスを使用する熱処理炉
からの雰囲気排ガスのうち、水素濃度が低く循環使用で
きない雰囲気排ガスを回収し、低濃度の水素含有ガスを
雰囲気ガスとする熱処理炉の雰囲気ガスとして再利用す
ることを特徴とする熱処理炉雰囲気ガスの再利用方法で
ある。That is, according to the present invention, in a heat treatment furnace for heat-treating a steel sheet using a hydrogen-containing gas as an atmosphere gas, a low hydrogen concentration is circulated and used in an atmosphere exhaust gas from a heat treatment furnace using a high-concentration hydrogen-containing gas as an atmosphere gas. This is a method of reusing an atmosphere gas of a heat treatment furnace, characterized in that unexhaustible atmosphere exhaust gas is recovered and reused as an atmosphere gas of a heat treatment furnace using a low-concentration hydrogen-containing gas as the atmosphere gas.
【０００８】[0008]
【作用】この発明においては、雰囲気ガスとして高濃度
の水素含有ガスを使用する熱処理炉からの雰囲気排ガス
のうち、水素濃度が低く循環使用できない雰囲気排ガス
を回収し、低濃度の水素含有ガスを雰囲気ガスとする熱
処理炉の雰囲気ガスとして再利用するから、雰囲気ガス
全量の約３割を占める循環使用できない雰囲気排ガス
を、低濃度の水素含有ガスを雰囲気ガスとする熱処理炉
の雰囲気ガスとして再利用でき、バッチ式焼鈍炉で使用
する純水素ガスの９０％を再利用することができる。In the present invention, of the atmospheric exhaust gas from the heat treatment furnace which uses a high-concentration hydrogen-containing gas as an atmospheric gas, the atmospheric exhaust gas having a low hydrogen concentration and which cannot be circulated is recovered, and the low-concentration hydrogen-containing gas is used as an atmosphere Since it is reused as the atmosphere gas of the heat treatment furnace that is used as a gas, the unrecycled atmosphere exhaust gas that accounts for about 30% of the total amount of the atmosphere gas can be reused as the atmosphere gas of the heat treatment furnace that uses a low-concentration hydrogen-containing gas as the atmosphere gas. 90% of the pure hydrogen gas used in the batch type annealing furnace can be reused.
【０００９】雰囲気ガスとして高濃度の水素含有ガスを
使用する熱処理炉からの雰囲気排ガスのうち、水素濃度
が低く循環使用できない雰囲気排ガスは、例えばバッチ
式焼鈍炉では炉内の空気を窒素ガスでパージしたのち、
高濃度の水素含有ガスを導入する焼鈍初期ならびに焼鈍
完了後に炉内の高濃度の水素含有ガスを窒素ガスにより
パージする際に排出される。したがって、これらの水素
濃度が低く循環使用できない雰囲気排ガスは、これを回
収したのち精製装置に導入し、ガス中の油、水分、
Ｏ2、ＣＯ、ＣＯ2を除去すれば、低濃度の水素含有ガス
を雰囲気ガスとする熱処理炉の雰囲気ガスとして十分に
再利用することができる。低濃度の水素含有ガスを雰囲
気ガスとする熱処理炉での再利用に際しては、回収精製
された低濃度の水素含有ガス雰囲気排ガスの水素濃度が
変動するため、水素濃度計により回収精製された低濃度
の水素含有ガス雰囲気排ガス中の水素濃度を測定し、所
定の水素濃度になるよう純水素または高濃度の水素含有
ガスを混合して使用する。Of the atmospheric exhaust gas from the heat treatment furnace that uses a high-concentration hydrogen-containing gas as the atmospheric gas, the atmospheric exhaust gas that has a low hydrogen concentration and cannot be circulated, for example, purges the air in the furnace with nitrogen gas in a batch annealing furnace. After that,
It is discharged when the high-concentration hydrogen-containing gas in the furnace is purged with nitrogen gas in the initial stage of annealing in which a high-concentration hydrogen-containing gas is introduced and after the completion of annealing. Therefore, these exhaust gases with a low hydrogen concentration that cannot be circulated are introduced into a refining device after they are collected, and the oil, water,
If O 2 , CO, and CO 2 are removed, it can be sufficiently reused as an atmosphere gas in a heat treatment furnace using a low-concentration hydrogen-containing gas as an atmosphere gas. When reused in a heat treatment furnace where a low-concentration hydrogen-containing gas is used as the atmosphere gas, the hydrogen concentration of the recovered and refined low-concentration hydrogen-containing gas atmosphere exhaust gas fluctuates, so the low concentration recovered and refined by a hydrogen concentration meter Hydrogen-containing gas atmosphere The hydrogen concentration in the exhaust gas is measured, and pure hydrogen or a high-concentration hydrogen-containing gas is mixed and used so as to have a predetermined hydrogen concentration.
【００１０】[0010]
実施例１ 以下にこの発明方法の詳細を実施の一例を示す図１に基
づいて説明する。図１はこの発明方法の実施に適した熱
処理設備のガス系統図である。図１において、１は純水
素ガスを雰囲気ガスとして使用するバッチ式コイル焼鈍
炉、２はバッチ式コイル焼鈍炉１内への純水素ガス供給
管、３はバッチ式コイル焼鈍炉１内への純窒素ガス供給
管で、バッチ式コイル焼鈍炉１のコイル入替え後、先ず
純窒素ガス供給管３から純窒素ガスが導入され、バッチ
式コイル焼鈍炉１内の空気が純窒素ガスと置換される。
この際排出される排ガスは、水素を含有しないため、放
散管４の開閉弁５を開放し、大気中に放出される。Example 1 Details of the method of the present invention will be described below with reference to FIG. FIG. 1 is a gas system diagram of a heat treatment facility suitable for carrying out the method of the present invention. In FIG. 1, 1 is a batch type coil annealing furnace that uses pure hydrogen gas as an atmosphere gas, 2 is a pure hydrogen gas supply pipe into the batch type coil annealing furnace 1, and 3 is a pure hydrogen gas into the batch type coil annealing furnace 1. After replacing the coils of the batch type coil annealing furnace 1 with the nitrogen gas supply pipe, first, pure nitrogen gas is introduced from the pure nitrogen gas supply pipe 3 to replace the air in the batch type coil annealing furnace 1 with the pure nitrogen gas.
Since the exhaust gas discharged at this time does not contain hydrogen, the on-off valve 5 of the diffusion pipe 4 is opened and released into the atmosphere.
【００１１】バッチ式コイル焼鈍炉１内の純窒素ガスに
よる空気の置換が完了すると、開閉弁５を閉止すると共
に、純窒素ガス供給管３から純窒素ガスの導入を停止
し、純水素ガス供給管２からバッチ式コイル焼鈍炉１内
へ純水素ガスが導入され、燃焼が開始されるが、焼鈍初
期の雰囲気排ガスは、多量の窒素を含有しているため、
バッチ式コイル焼鈍炉１へ循環使用することはできな
い。６は焼鈍初期の多量の窒素を含有する雰囲気排ガス
を回収するためのブロアで、開閉弁７を開放してブロア
６を駆動すれば、焼鈍初期の多量の窒素を含有する雰囲
気排ガスが精製設備８に回収され、ガス中の油、水分、
Ｏ2、ＣＯ、ＣＯ2が除去精製されるよう構成されてい
る。When the replacement of air with pure nitrogen gas in the batch type coil annealing furnace 1 is completed, the on-off valve 5 is closed and the introduction of pure nitrogen gas from the pure nitrogen gas supply pipe 3 is stopped to supply pure hydrogen gas. Pure hydrogen gas is introduced from the tube 2 into the batch type coil annealing furnace 1 and combustion is started. However, since the atmosphere exhaust gas in the initial stage of annealing contains a large amount of nitrogen,
It cannot be recycled to the batch type coil annealing furnace 1. Reference numeral 6 is a blower for recovering the atmospheric exhaust gas containing a large amount of nitrogen in the initial stage of annealing. When the opening / closing valve 7 is opened and the blower 6 is driven, the atmospheric exhaust gas containing a large amount of nitrogen in the initial stage of annealing is purified. Collected in the gas, oil in the gas, moisture,
It is configured to remove and purify O 2 , CO, and CO 2 .
【００１２】９は精製設備８でガス中の油、水分、
Ｏ2、ＣＯ、ＣＯ2が除去精製された精製雰囲気排ガス
を、低濃度水素ガスを雰囲気ガスとして使用する熱処理
炉１０に導入するための管路、１１は管路９に設けた水
素濃度計、１２は管路９に設けた流量計、１３は制御部
で、水素濃度計１１から入力される精製雰囲気排ガス中
の水素濃度および流量計１２から入力される精製雰囲気
排ガス流量に基づいて、所定の水素濃度となるよう純水
素ガス供給管１４の制御弁１５または純窒素ガス供給管
１６の制御弁１７を制御し、流量計１８または１９から
入力される純水素ガスまたは純窒素ガスの流量を制御す
るよう構成されている。なお、バッチ式コイル焼鈍炉１
内の雰囲気ガス中の水素濃度が所定の濃度に到達以降
は、バッチ式コイル焼鈍炉１からの雰囲気排ガスを別途
回収し、ガス中の油、水分、Ｏ2、ＣＯ、ＣＯ2を除去し
たのち、バッチ式コイル焼鈍炉１内へ循環する系統につ
いては省略した。Reference numeral 9 denotes a refining facility 8, which is an oil in the gas, a water content,
A conduit for introducing the purified atmosphere exhaust gas from which O 2 , CO, and CO 2 have been removed and purified into the heat treatment furnace 10 using low-concentration hydrogen gas as an atmosphere gas, 11 a hydrogen concentration meter provided in the conduit 9, Reference numeral 12 is a flow meter provided in the pipe line 9, and 13 is a control unit. Based on the hydrogen concentration in the purification atmosphere exhaust gas input from the hydrogen concentration meter 11, and the purification atmosphere exhaust gas flow rate input from the flow meter 12, The control valve 15 of the pure hydrogen gas supply pipe 14 or the control valve 17 of the pure nitrogen gas supply pipe 16 is controlled so that the hydrogen concentration is controlled, and the flow rate of the pure hydrogen gas or the pure nitrogen gas input from the flowmeter 18 or 19 is controlled. Is configured to. In addition, batch type coil annealing furnace 1
After the hydrogen concentration in the internal atmosphere gas reaches a predetermined concentration, the atmospheric exhaust gas from the batch-type coil annealing furnace 1 is separately collected, and the oil, water, O 2 , CO, and CO 2 in the gas are removed. The system circulating in the batch type coil annealing furnace 1 is omitted.
【００１３】上記のとおり構成したことによって、バッ
チ式コイル焼鈍炉１の雰囲気排ガス中の水素濃度が低
く、バッチ式コイル焼鈍炉１内へ循環使用できない雰囲
気排ガスは、開閉弁７を開放してブロア６を駆動するこ
とにより精製設備８に回収され、ガス中の油、水分、Ｏ
2、ＣＯ、ＣＯ2が除去精製されたのち、管路９を経て制
御部１３により所定の水素濃度に調整され、低濃度水素
ガスを雰囲気ガスとして使用する熱処理炉１０に導入さ
れ、雰囲気ガスとして再使用されたのち、放散管２０か
ら大気中に放散される。With the above configuration, the atmosphere exhaust gas in the batch type coil annealing furnace 1 has a low hydrogen concentration and cannot be circulated into the batch type coil annealing furnace 1. By driving 6 the oil is recovered in the refining equipment 8 and the oil, water, O in the gas
After removing and purifying 2 , CO, and CO 2 , the hydrogen concentration is adjusted to a predetermined hydrogen concentration by the control unit 13 through the pipe 9, and is introduced into the heat treatment furnace 10 that uses low-concentration hydrogen gas as an atmosphere gas, After being reused, it is diffused into the atmosphere through the diffusion pipe 20.
【００１４】なお、バッチ式コイル焼鈍炉１内の雰囲気
ガス中の水素濃度が所定の濃度に到達以降は、バッチ式
コイル焼鈍炉１からの雰囲気排ガスはバッチ式コイル焼
鈍炉１内に循環使用されるので、制御部１３は、純水素
ガス供給管１４の制御弁１５または純窒素ガス供給管１
６の制御弁１７を制御し、流量計１８または１９から入
力される純水素ガスまたは純窒素ガスの流量を制御して
純水素ガスと純窒素ガスを混合し、所定の低濃度水素ガ
スとなして雰囲気ガスとして熱処理炉１０に導入するこ
とはいうまでもない。After the hydrogen concentration in the atmospheric gas in the batch type coil annealing furnace 1 reaches a predetermined concentration, the atmospheric exhaust gas from the batch type coil annealing furnace 1 is circulated and used in the batch type coil annealing furnace 1. Therefore, the control unit 13 controls the control valve 15 of the pure hydrogen gas supply pipe 14 or the pure nitrogen gas supply pipe 1
The control valve 17 of No. 6 is controlled to control the flow rate of pure hydrogen gas or pure nitrogen gas input from the flow meter 18 or 19 to mix pure hydrogen gas and pure nitrogen gas to obtain a predetermined low concentration hydrogen gas. It goes without saying that the gas is introduced into the heat treatment furnace 10 as an atmospheric gas.
【００１５】実施例２ 装入最大重量が１００Ｔｏｎ／チャージ、装入寸法が直
径２０００ｍｍ、高さ４３００ｍｍの純水素ガスを雰囲
気ガスとするバッチ式焼鈍炉を使用し、図２に示す焼鈍
パターンにより雰囲気ガスを導入し、実施例１の方法に
よって雰囲気排ガスを回収し、水素濃度２０％、窒素濃
度８０％の組成の雰囲気ガスを使用する連続式の熱処理
炉の雰囲気ガスとして再利用した。その結果、純水素ガ
スを雰囲気ガスとするバッチ式焼鈍炉で使用する純水素
の原単位１．２Ｎｍ3／Ｔｏｎのうち、９０％を再利用
することができた。Example 2 A batch type annealing furnace having a maximum charging weight of 100 Ton / charge, a charging dimension of 2000 mm and a height of 4300 mm and using pure hydrogen gas as an atmosphere gas was used. A gas was introduced, and the atmospheric exhaust gas was recovered by the method of Example 1 and reused as an atmospheric gas for a continuous heat treatment furnace using an atmospheric gas having a composition of hydrogen concentration of 20% and nitrogen concentration of 80%. As a result, 90% of the basic unit of pure hydrogen used in the batch annealing furnace using pure hydrogen gas as an atmosphere gas, 1.2 Nm 3 / Ton, could be reused.
【００１６】[0016]
【発明の効果】以上述べたとおり、この発明方法によれ
ば、高濃度水素含有ガスを雰囲気ガスとする焼鈍炉から
排出され、大気中に放出されていた低濃度水素含有雰囲
気排ガスを有効に再利用でき、アンモニアや純水素ガス
ならびに純窒素ガスの使用量を大幅に削減でき、鋼板の
焼鈍費用を低減できる。As described above, according to the method of the present invention, the low-concentration hydrogen-containing atmosphere exhaust gas discharged from the annealing furnace having the high-concentration hydrogen-containing gas as the atmosphere gas and released into the atmosphere is effectively regenerated. It can be used, the amount of ammonia, pure hydrogen gas and pure nitrogen gas used can be significantly reduced, and the annealing cost of the steel sheet can be reduced.
【図１】この発明方法の実施に適した熱処理設備のガス
系統図である。FIG. 1 is a gas system diagram of heat treatment equipment suitable for carrying out the method of the present invention.
【図２】実施例２におけるバッチ式焼鈍炉での焼鈍パタ
ーンの説明図である。FIG. 2 is an explanatory diagram of an annealing pattern in a batch type annealing furnace in Example 2.
１ バッチ式コイル焼鈍炉 ２、１４ 純水素ガス供給管 ３、１６ 純窒素ガス供給管 ４、２０ 放散管 ５、７ 開閉弁 ６ ブロア ８ 精製設備 ９ 管路 １０ 熱処理炉 １１ 水素濃度計 １２、１８、１９ 流量計 １３ 制御部 １５、１７ 制御弁 1 Batch type coil annealing furnace 2,14 Pure hydrogen gas supply pipe 3,16 Pure nitrogen gas supply pipe 4,20 Emission pipe 5,7 Open / close valve 6 Blower 8 Purification equipment 9 Pipe line 10 Heat treatment furnace 11 Hydrogen concentration meter 12,18 , 19 Flowmeter 13 Control unit 15, 17 Control valve
Claims (1)
熱処理する熱処理炉において、雰囲気ガスとして高濃度
の水素含有ガスを使用する熱処理炉からの雰囲気排ガス
のうち、水素濃度が低く循環使用できない雰囲気排ガス
を回収し、低濃度の水素含有ガスを雰囲気ガスとする熱
処理炉の雰囲気ガスとして再利用することを特徴とする
熱処理炉雰囲気ガスの再利用方法。1. A heat treatment furnace for heat-treating a steel sheet using a hydrogen-containing gas as an atmosphere gas, wherein the exhaust gas from the heat treatment furnace using a high-concentration hydrogen-containing gas as the atmosphere gas has a low hydrogen concentration and cannot be circulated. Is recovered and reused as an atmosphere gas of a heat treatment furnace in which a low-concentration hydrogen-containing gas is used as an atmosphere gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11906693A JPH06306454A (en) | 1993-04-21 | 1993-04-21 | Method for reusing atmospheric gas in heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11906693A JPH06306454A (en) | 1993-04-21 | 1993-04-21 | Method for reusing atmospheric gas in heat treatment furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06306454A true JPH06306454A (en) | 1994-11-01 |
Family
ID=14752055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11906693A Pending JPH06306454A (en) | 1993-04-21 | 1993-04-21 | Method for reusing atmospheric gas in heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06306454A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006119526A1 (en) * | 2005-05-12 | 2006-11-16 | Ebner Industrieofenbau Gesellschaft M.B.H. | Method for the batch heat-treatment of annealing product |
| WO2023147719A1 (en) * | 2022-02-07 | 2023-08-10 | 中冶南方工程技术有限公司 | Protective gas supply and recycling method for cold-rolling annealing furnace |
-
1993
- 1993-04-21 JP JP11906693A patent/JPH06306454A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006119526A1 (en) * | 2005-05-12 | 2006-11-16 | Ebner Industrieofenbau Gesellschaft M.B.H. | Method for the batch heat-treatment of annealing product |
| JP2008540833A (en) * | 2005-05-12 | 2008-11-20 | エープナー インドゥストリーオーフェンバウ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method of heat-treating annealed parts in batch operation |
| US7875235B2 (en) | 2005-05-12 | 2011-01-25 | Ebner Industrieofenbau Gesellschaft M.B.H. | Method for batchwise heat treatment of goods to be annealed |
| WO2023147719A1 (en) * | 2022-02-07 | 2023-08-10 | 中冶南方工程技术有限公司 | Protective gas supply and recycling method for cold-rolling annealing furnace |
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