JPH0726147B2 - Circulation method of atmospheric gas in heat treatment - Google Patents
Circulation method of atmospheric gas in heat treatmentInfo
- Publication number
- JPH0726147B2 JPH0726147B2 JP61062582A JP6258286A JPH0726147B2 JP H0726147 B2 JPH0726147 B2 JP H0726147B2 JP 61062582 A JP61062582 A JP 61062582A JP 6258286 A JP6258286 A JP 6258286A JP H0726147 B2 JPH0726147 B2 JP H0726147B2
- Authority
- JP
- Japan
- Prior art keywords
- heat treatment
- gas
- treatment chamber
- chamber
- atmospheric gas
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は雰囲気ガス熱処理炉における雰囲気ガスの循環
方法に関するものである。The present invention relates to a method for circulating an atmospheric gas in an atmospheric gas heat treatment furnace.
［従来の技術と問題点］ 一般に熱処理炉の雰囲気ガスは例えば還元処理，無酸化
処理，弱酸化処理等その金属の処理目的に適合する種々
の組成の雰囲気ガスが用いられる。周知のように雰囲気
ガス中に含まれる成分のうちCO2,H2O,O2は酸化性のガス
で、H2,COは還元性のガスである。従つて雰囲気ガスが
酸化性であるか還元性であるか中性であるかはそれらの
分圧比（CO/CO2、または、H2/H2O）によつて決まること
で、H2,CO等の未燃成分比率が高い程還元性が強くな
る。例えばモータコア用電磁鋼板の熱処理工程において
は、プレス打抜時の加工歪を除き電磁特性を向上させる
ために熱処理室に入れて中性または還元性に保たれた雰
囲気ガス中で焼鈍されその際の酸化が防止されるように
している。続いてこの電磁鋼板は弱酸化性の雰囲気ガス
を充満した他の熱処理室に入れられこの熱処理室にてい
わゆるブルーイングといつて表面に四酸化鉄（Fe3O4）
を生成させ防錆力と電気特性を向上させるようにしてい
る。[Prior Art and Problems] In general, the atmosphere gas of the heat treatment furnace is an atmosphere gas of various compositions suitable for the purpose of treating the metal such as reduction treatment, non-oxidation treatment, and weak oxidation treatment. As is well known, among the components contained in the atmospheric gas, CO 2 , H 2 O and O 2 are oxidizing gases, and H 2 and CO are reducing gases. Therefore, whether the atmospheric gas is oxidizing, reducing or neutral is determined by their partial pressure ratio (CO / CO 2 or H 2 / H 2 O), and H 2 ,, The higher the ratio of unburned components such as CO, the stronger the reducibility. For example, in the heat treatment process for electromagnetic steel sheets for motor cores, the steel is annealed in an atmosphere gas kept neutral or reducing in a heat treatment chamber in order to improve the electromagnetic characteristics except for the processing strain during press punching. It is designed to prevent oxidation. Subsequently, this electrical steel sheet was placed in another heat treatment chamber filled with a weakly oxidizing atmosphere gas, and in this heat treatment chamber, so-called bluing and iron tetraoxide (Fe 3 O 4 ) were formed on the surface.
To improve rust prevention and electrical characteristics.
しかしてこのように２つの熱処理室に互いに組成に差異
がある場合（即ちH2,CO等の未燃成分の比率に差異があ
る場合）従来では第３図に示したように２つの熱処理室
A,Bに夫々ガスジエネレータa,bにて成分コントロールし
て生成された雰囲気ガスを夫々供給していた。このため
にガスジエネレータが２台必要であつたし熱処理室A,B
に供給された雰囲気ガスはそのまま廃棄されていたので
多量の有害ガスが発生し公害源になり易くまたガス消費
が多くランニングコストがかさむ等の問題点があつた。However, when there is a difference in composition between the two heat treatment chambers (that is, when there is a difference in the ratio of unburned components such as H 2 and CO), the two heat treatment chambers are conventionally arranged as shown in FIG.
Atmosphere gases generated by controlling the components by gas generators a and b were supplied to A and B, respectively. For this reason, two gas generators are required, and heat treatment chambers A and B are required.
Since the atmospheric gas supplied to the equipment was discarded as it is, a large amount of harmful gas is generated, which easily becomes a pollution source, and there is a problem that the gas consumption is large and the running cost is high.
［問題点を解決するための手段］ 本発明は上記問題点をい解決しようとするもので、被熱
物の処理目的に応じて少なくとも２つの熱処理室が設け
られ、この両熱処理室にて保持されるべき雰囲気ガスの
組成の未燃成分比率に差異があるとき、先ず未燃成分比
率が相対的に高い雰囲気ガスをガスジエネレータにて生
成してこの雰囲気ガスを一方の未燃成分比率が高く保た
れるべき熱処理室に供給し、この熱処理室より排出され
た雰囲気ガスに酸素を添加してこの雰囲気ガスを他方の
未燃成分比率が相対的に低く保たれるべき熱処理室に供
給するようにしたことを特徴とする熱処理における雰囲
気ガスの循環方法である。これを第２図に従い説明すれ
ば、１は熱処理室２に供給される未燃成分比率が相対的
に高い雰囲気ガスを生成するガスジエネレータ、３は該
熱処理室２から排出された雰囲気ガスに酸素を添加して
その雰囲気ガスの未燃成分比率を下げる変換装置で、該
変換装置から他方の熱処理室４に適合する未燃成分比率
が相対的に低い雰囲気ガスが供給される。[Means for Solving the Problems] The present invention is intended to solve the above problems, and at least two heat treatment chambers are provided according to the purpose of treating the object to be heated. When there is a difference in the unburned component ratio of the composition of the atmosphere gas to be performed, first, an atmosphere gas with a relatively high unburned component ratio is generated by a gas generator, and this atmosphere gas is kept at a high unburned component ratio. It is supplied to the heat treatment chamber to be sacrificed, oxygen is added to the atmosphere gas discharged from this heat treatment chamber, and this atmosphere gas is supplied to the heat treatment chamber in which the other unburned component ratio should be kept relatively low. This is a method for circulating the atmospheric gas in the heat treatment. This will be described with reference to FIG. 2. 1 is a gas generator that generates an atmospheric gas having a relatively high unburned component ratio supplied to the heat treatment chamber 2, and 3 is oxygen in the atmospheric gas discharged from the heat treatment chamber 2. An atmosphere gas having a relatively low unburned component ratio that is suitable for the other heat treatment chamber 4 is supplied from the converter by the addition device that lowers the unburned component ratio of the atmosphere gas.
［作用］ 一方の熱処理室から排出された雰囲気ガスを利用してこ
れより未燃成分比率の少ない雰囲気ガスを必要とする熱
処理炉にこれを供給するようにしたので、ガスジエネレ
ータで生成した雰囲気ガスを有効に利用でき省エネルギ
ー化，省設備化に寄与する。[Operation] Since the atmospheric gas discharged from one of the heat treatment chambers is used to supply the atmospheric gas having a lower unburned component ratio to the heat treatment furnace, the atmospheric gas generated by the gas generator is It can be used effectively and contributes to energy saving and equipment saving.
［実施例］ 第１図に実施例としてモータコア用電磁鋼板の連続的な
まし炉の全体およびその各熱処理工程における被熱物の
温度カーブを示す。同図において、１はジエネレータ、
２は第１の熱処理室、３は変換装置、４は第２の熱処理
室、５は被熱物たる電磁鋼板で該被熱物は搬送ローラ6,
6……によつて同図中右方向に移送される。７は被熱物
５に付着しているプレス打抜油を焼却除去するためのバ
ーンオフ室、８はその入口扉で、該バーンオフ室７は空
気雰囲気に保たれ着火用のバーナ（図示せず）がその側
壁に設けられている。９は天井フアンである。10はバー
ンオフ室７と熱処理室２との間に扉11,12をもつて区画
形成されたパージ室（ガス置換室）で、該パージ室を経
て被熱物５を熱処理室２へ移送することで熱処理室２へ
空気が侵入しないようにしている。熱処理室２には電熱
ヒータ13,天井フアン14が設けられている。15は熱処理
室２に後続する徐冷室で、該徐冷室には内部に冷却媒体
を流通されるクーリングチユーブ16,16……が配設され
ている。17は冷却室15と第２の熱処理室４とを結ぶパー
ジ室で、該パージ室は扉18,19を備えていて冷却室15中
の被熱物を熱処理室４に移送するとき前記パージ室10と
同様に該扉18,19を交互に開くことによつて冷却室15の
雰囲気ガスと熱処理室４の雰囲気ガスとが可及的に交流
しないようにする。熱処理室４には天井フアン20および
熱源（図示せず）が設けられている。21は熱処理室４の
出口扉である。22は熱処理室４に後続する空冷室でここ
ではフアン23により被熱物に空気が吹付けられる。[Embodiment] As an embodiment, FIG. 1 shows a temperature curve of an object to be heated in the entire continuous annealing furnace for motor core electromagnetic steel sheets and each heat treatment step thereof. In the figure, 1 is a generator,
Reference numeral 2 is a first heat treatment chamber, 3 is a conversion device, 4 is a second heat treatment chamber, 5 is an electromagnetic steel plate which is a heat target, and the heat target is a transfer roller 6,
6 …… is transferred to the right in the figure. Reference numeral 7 is a burn-off chamber for incinerating and removing the press-punching oil adhering to the article to be heated 5, 8 is an inlet door thereof, and the burn-off chamber 7 is kept in an air atmosphere and has a burner (not shown) for ignition. It is provided on the side wall. 9 is a ceiling fan. Reference numeral 10 denotes a purge chamber (gas replacement chamber) which is partitioned and formed with doors 11 and 12 between the burn-off chamber 7 and the heat treatment chamber 2, and transfers the object 5 to the heat treatment chamber 2 through the purge chamber. Therefore, air is prevented from entering the heat treatment chamber 2. An electric heater 13 and a ceiling fan 14 are provided in the heat treatment chamber 2. Reference numeral 15 denotes a slow cooling chamber subsequent to the heat treatment chamber 2, in which cooling tubes 16, 16 ... In which a cooling medium is circulated are arranged. Reference numeral 17 denotes a purge chamber that connects the cooling chamber 15 and the second heat treatment chamber 4, and the purge chamber is provided with doors 18 and 19 and is used when the heat target in the cooling chamber 15 is transferred to the heat treatment chamber 4. By opening the doors 18 and 19 alternately as in the case of 10, the atmosphere gas in the cooling chamber 15 and the atmosphere gas in the heat treatment chamber 4 are prevented from interacting as much as possible. The heat treatment chamber 4 is provided with a ceiling fan 20 and a heat source (not shown). Reference numeral 21 is an exit door of the heat treatment chamber 4. Reference numeral 22 denotes an air cooling chamber that follows the heat treatment chamber 4, in which air is blown onto the object to be heated by a fan 23.
しかして前記ガスジエネレータ１はプロパンガスを空気
不足の状況にて燃焼して次表に示したようにCO,H2等還
元性ガス未燃成分の比率が高い発熱形ガスを熱処理室２
に供給する。Thus the Gasujienereta 1 CO as shown in the following table by burning propane gas at conditions of insufficient air, H 2, etc. reducing gas unburned component ratio is high fever type gas heat treatment chamber 2
Supply to.
熱処理炉２にて被熱物５は所要の焼鈍温度に達するまで
この雰囲気ガス中で加熱されるその際の酸化が防止され
る。また徐冷室に至りてその被熱物５はその雰囲気ガス
中にてゆつくり降温し焼なまし状態を保つ。熱処理室２
から排出された雰囲気ガスは配管24を通して変換装置３
に導びかれる。変換装置３ではバルブ25を通して酸素
（空気）が添加されるその雰囲気ガス中のCO,H2等の未
燃成分を酸化させ上記表に示したようにそれら未燃成分
の比率を低下させこれを弱酸化性の発熱形ガスに変換す
る。そしてこの弱酸化性の雰囲気ガスを配管26を通して
第２の熱処理室４に供給する。27はその配管途中にてCO
濃度を検出しバルブ25をフイードバックコントロールす
ることにより酸素添加量を加減しそのCO濃度が常に所期
値に保たれるようにしたコントローラである。第２の熱
処理室４はいわゆるブルーイング処理を施すところで、
被熱物５を弱酸化性雰囲気中で再加熱し該被熱物５の表
面に四酸化鉄（Fe3O4）を生成させ電磁鋼板の防錆力と
電気特性を向上させるために行なわれる。なお熱処理室
４より抽出された被熱物５は空冷室22にてさらにハンド
リング可能温度まで空冷させる。 The object 5 to be heated in the heat treatment furnace 2 is heated in this atmosphere gas until the required annealing temperature is reached, and oxidation at that time is prevented. Further, when reaching the slow cooling chamber, the object to be heated 5 is kept in an annealing state by being loosely cooled in the atmosphere gas. Heat treatment room 2
Atmospheric gas discharged from the converter 3 through the pipe 24
Be guided to. In the converter 3, oxygen (air) is added through the valve 25 to oxidize unburned components such as CO and H 2 in the atmospheric gas to reduce the ratio of these unburned components as shown in the above table. Converts to weakly oxidizing exothermic gas. Then, this weakly oxidizing atmosphere gas is supplied to the second heat treatment chamber 4 through the pipe 26. 27 is CO in the middle of the piping
This is a controller that detects the concentration and controls the feedback of the valve 25 to adjust the oxygen addition amount so that the CO concentration is always kept at a desired value. In the second heat treatment chamber 4, where the so-called bluing treatment is applied,
It is performed to reheat the object 5 to be heated in a weakly oxidizing atmosphere to generate iron tetroxide (Fe 3 O 4 ) on the surface of the object 5 and to improve the rust preventive power and electrical characteristics of the electrical steel sheet. . The object to be heated 5 extracted from the heat treatment chamber 4 is further cooled in the air cooling chamber 22 to a temperature at which it can be handled.
なおこの実施例では、変換装置３にて、CO濃度が７％か
ら1.5％に下がり、このCO＋1/2O2→CO2の反応による発
熱量Qcoは、 Qco＝2570Kcal/m3N×0.055×1m3N ＝141.35Kcal となり、また、H2濃度が５％から1.2％に下がること、
即ちH2＋1/2O2→H2Oに伴なう発熱量QH2は、 QH2＝3020Kcal/m3H×0.038×1m3N ＝114.76Kcal になる。In this embodiment, in the converter 3, the CO concentration is reduced from 7% to 1.5%, and the calorific value Qco due to the reaction of CO + 1 / 2O 2 → CO 2 is Qco = 2570Kcal / m 3 N × 0.055 × 1 m 3 N = 141.35 Kcal, and the H 2 concentration drops from 5% to 1.2%,
That is, the calorific value QH 2 associated with H 2 + 1 / 2O 2 → H 2 O is QH 2 = 3020Kcal / m 3 H × 0.038 × 1m 3 N = 114.76Kcal.
また、この反応に必要なO2量は、1/2（0.055＋0.038）
＝0.093m3Nであるから必要な空気量は0.093/0.21＝0.44
3m3Nとなる。このため配管24を通して導びかれた雰囲気
ガスの初期温度を600℃と仮定すると上昇温度は、 になる。このようにこの反応により雰囲気ガス温度が上
昇するので第２の熱処理室４には熱源を必要としない場
合もある。Also, the amount of O 2 required for this reaction is 1/2 (0.055 + 0.038)
= 0.093m 3 N, the required air volume is 0.093 / 0.21 = 0.44
It will be 3m 3 N. Therefore, assuming that the initial temperature of the atmospheric gas introduced through the pipe 24 is 600 ° C, the temperature rise will be become. As described above, the temperature of the atmospheric gas rises due to this reaction, so that the second heat treatment chamber 4 may not require a heat source.
［発明の効果］ このように本発明の熱処理における雰囲気ガスの循環方
法は、保持されるべき未燃成分比率を相対的に異にする
少なくとも２つの熱処理室を有する熱処理炉において、
ガスジェネレータで生成された雰囲気ガスを先ず未燃成
分比率の高い雰囲気ガスを必要とする熱処理室に供給
し、その熱処理室から排出された雰囲気ガスに酸素を添
加して未燃成分比率の低い雰囲気ガスを必要とする熱処
理室に循環させるようにしたので、ガスジェネレータで
生成した雰囲気ガスを２つの熱処理にて有効に利用で
き、雰囲気ガス生成のための設備コストおよびランニン
グコストを軽減できると共に、大気中への排ガス総量も
少なくでき公害源の減少になるなどの産業上有益な効果
がある。[Effects of the Invention] As described above, the method of circulating the atmospheric gas in the heat treatment of the present invention, in the heat treatment furnace having at least two heat treatment chambers in which the ratios of unburned components to be held are relatively different,
The atmosphere gas generated by the gas generator is first supplied to a heat treatment chamber that requires an atmosphere gas with a high unburned component ratio, and oxygen is added to the atmosphere gas discharged from the heat treatment chamber to create an atmosphere with a low unburned component ratio. Since the gas is circulated in the heat treatment chamber that requires it, the atmospheric gas generated by the gas generator can be effectively used in the two heat treatments, and the facility cost and running cost for generating the atmospheric gas can be reduced and the atmospheric gas can be reduced. The total amount of exhaust gas into the interior can be reduced, which has a beneficial effect on industry, such as the reduction of pollution sources.
第１図は本発明の一実施例を示した連続焼なまし炉の全
体の縦断面図、第２図は本発明の雰囲気ガス循環の要旨
説明図、第３図は従来の雰囲気ガス供給の説明用図であ
る。 １……ガスジエネレータ、２……第１の熱処理室、３…
…変換装置、４……第２の熱処理室、５……被熱物。FIG. 1 is a longitudinal sectional view of an entire continuous annealing furnace showing an embodiment of the present invention, FIG. 2 is a schematic explanatory view of the atmospheric gas circulation of the present invention, and FIG. 3 is a conventional atmospheric gas supply. FIG. 1 ... Gas generator, 2 ... First heat treatment chamber, 3 ...
… Conversion device, 4 …… Second heat treatment chamber, 5 …… Heating object.
Claims (1)
の熱処理室が設けられ、この両熱処理室にて保持される
べき雰囲気ガスの組成の未燃成分比率に差異があると
き、先ず未燃成分比率が相対的に高い雰囲気ガスをガス
ジエネレータにて生成してこの雰囲気ガスを一方の未燃
成分比率が高く保たれるべき熱処理室に供給し、この熱
処理室より排出された雰囲気ガスに酸素を添加してこの
雰囲気ガスを他方の未燃成分比率が相対的に低く保たれ
るべき熱処理室に供給するようにしたことを特徴とする
熱処理における雰囲気ガスの循環方法。1. At least two heat treatment chambers are provided according to the purpose of treating a heat-treated object, and when there is a difference in the unburned component ratio of the composition of the atmosphere gas to be held in both heat treatment chambers, first, An atmosphere gas with a relatively high combustible component ratio is generated by a gas generator, and this atmospheric gas is supplied to one of the heat treatment chambers where the unburned component ratio should be kept high, and oxygen is added to the atmosphere gas discharged from this heat treatment chamber. Is added to supply the atmosphere gas to the heat treatment chamber in which the other unburned component ratio is to be kept relatively low, the method for circulating the atmosphere gas in the heat treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61062582A JPH0726147B2 (en) | 1986-03-19 | 1986-03-19 | Circulation method of atmospheric gas in heat treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61062582A JPH0726147B2 (en) | 1986-03-19 | 1986-03-19 | Circulation method of atmospheric gas in heat treatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62218513A JPS62218513A (en) | 1987-09-25 |
| JPH0726147B2 true JPH0726147B2 (en) | 1995-03-22 |
Family
ID=13204457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61062582A Expired - Lifetime JPH0726147B2 (en) | 1986-03-19 | 1986-03-19 | Circulation method of atmospheric gas in heat treatment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0726147B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6241515B1 (en) * | 2000-05-30 | 2001-06-05 | Tat Technologies, Inc | Device and method for treating combustibles obtained from a thermal processing apparatus and apparatus employed thereby |
| JP7253779B2 (en) * | 2019-02-07 | 2023-04-07 | 関東冶金工業株式会社 | Continuous heat treatment furnace |
| CN113584268A (en) * | 2021-06-16 | 2021-11-02 | 盛源(漳州)炉业有限公司 | Annealing bluing furnace |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50159837A (en) * | 1974-06-18 | 1975-12-24 | ||
| JPS5635715A (en) * | 1979-08-29 | 1981-04-08 | Yamazaki Denki Kogyo Kk | Nonoxidizing heat treatment furnace |
-
1986
- 1986-03-19 JP JP61062582A patent/JPH0726147B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62218513A (en) | 1987-09-25 |
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