JPH0448480Y2 - - Google Patents
Info
- Publication number
- JPH0448480Y2 JPH0448480Y2 JP16854287U JP16854287U JPH0448480Y2 JP H0448480 Y2 JPH0448480 Y2 JP H0448480Y2 JP 16854287 U JP16854287 U JP 16854287U JP 16854287 U JP16854287 U JP 16854287U JP H0448480 Y2 JPH0448480 Y2 JP H0448480Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- gas
- prevention device
- heat treatment
- flashback prevention
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 30
- 230000002265 prevention Effects 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 26
- 238000001816 cooling Methods 0.000 description 6
- 239000002360 explosive Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005261 decarburization Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OBOXTJCIIVUZEN-UHFFFAOYSA-N [C].[O] Chemical compound [C].[O] OBOXTJCIIVUZEN-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Details (AREA)
Description
【考案の詳細な説明】
〈産業上の利用分野〉
本考案は粉末冶金用の鉄粉等を高温の真空中で
脱酸・脱炭を行う真空熱処理炉排ガス排気装置に
関するものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a vacuum heat treatment furnace exhaust gas exhaust system that deoxidizes and decarburizes iron powder for powder metallurgy in high-temperature vacuum.
〈従来の技術〉
粉末冶金用鉄粉の熱処理は高温真空中で脱酸・
脱炭同時進行の形態でしばしば行われている。<Conventional technology> Heat treatment of iron powder for powder metallurgy involves deoxidation and deoxidation in a high-temperature vacuum.
It is often carried out in the form of simultaneous decarburization.
この熱処理に高温真空熱処理炉が用いられてお
り、通常第３図に示すように予熱室１ａ、加熱室
１ｂ、ガス冷却室１ｃの３室に区分されている
（特開昭61−190004参照）。予熱室１ａで効率よく
加熱後加熱室１ｂで高温真空中、例えば1200℃、
10-2Torr下で脱酸・脱炭を同時進行させ、鉄粉
の持つている酸素と炭素が結合し、一酸素炭素と
して除去される（Ｃ＋Ｏ→CO↑）。従つて、この
時はCOガスが加熱室から盛んに発生し、一部は
予熱室からも生じる。加熱室にて脱酸・脱炭完了
後、ガス冷却室１ｃにて常温まで所定の冷却速度
で冷却される。 A high-temperature vacuum heat treatment furnace is used for this heat treatment, and is normally divided into three chambers: a preheating chamber 1a, a heating chamber 1b, and a gas cooling chamber 1c, as shown in Fig. 3 (see JP-A-61-190004). . After being efficiently heated in the preheating chamber 1a, it is heated in a high temperature vacuum in the heating chamber 1b, for example at 1200°C.
Deoxidation and decarburization proceed simultaneously under 10 -2 Torr, and the oxygen and carbon contained in the iron powder are combined and removed as monooxygen carbon (C+O→CO↑). Therefore, at this time, CO gas is actively generated from the heating chamber, and some of it is also generated from the preheating chamber. After deoxidation and decarburization are completed in the heating chamber, the gas is cooled to room temperature at a predetermined cooling rate in the gas cooling chamber 1c.
第３図において真空排気系は、予熱室１ａと加
熱室１ｂが真空装置（メカニカルブースター３・
油回転ポンプ４）の排出端で合流して一つの排気
ダクト５となり、ガス冷却室１ｃは独立した排気
ダクト５′から構成されている。この為、加熱室
１ｂから大量のCOガスが発生して、これを排気
している時、予熱室では次の熱処理物が装入され
大気状態から真空にする為、大量の空気を排気す
る組合せが生じ、COガスの爆発限界内となり静
電気や排気ダクトの錆の移動などにより火花が生
じ爆発に至るという恐れがあつた。 In Fig. 3, the evacuation system includes a preheating chamber 1a and a heating chamber 1b equipped with a vacuum device (mechanical booster 3,
They merge at the discharge end of the oil rotary pump 4) to form one exhaust duct 5, and the gas cooling chamber 1c is constituted by an independent exhaust duct 5'. For this reason, when a large amount of CO gas is generated from the heating chamber 1b and is being exhausted, the next heat-treated material is charged in the preheating chamber, and a large amount of air is exhausted in order to create a vacuum from the atmospheric state. There was a fear that the CO gas would be within the explosive limit and sparks could be generated due to static electricity or the movement of rust in the exhaust duct, leading to an explosion.
これに対して排気を予熱室と加熱室とを別々に
独立させる案もあるが、この場合COガスを排気
しつぱなしでは反応生成ガスの発生の減少ととも
に排気ダクト内に大気が浸入しCOガスと空気の
置換が始まつてやがてこれが進み最後には爆発混
合気となること、一方、予熱室では前回に排気さ
れ排気ダクト内に充満しているCOガス中に次回
装入ドア２ａが開いて、大気となつた予熱室から
の空気が真空装置を通して流れ込んでCOガスと
エアの接触部では爆発混合気となる恐れがあり、
対策として不完全であつた。 On the other hand, there is a plan to separate the preheating chamber and the heating chamber for exhaust gas, but in this case, if the CO gas is continuously exhausted, the generation of reaction product gas will decrease and the atmosphere will enter the exhaust duct, resulting in CO gas. This will eventually progress and eventually result in an explosive mixture.On the other hand, in the preheating chamber, the next charging door 2a will open into the CO gas that was exhausted last time and is filling the exhaust duct. There is a risk that the air from the preheating chamber, which has become atmospheric air, will flow through the vacuum device and create an explosive mixture at the point where the CO gas and air come into contact.
It was an incomplete countermeasure.
そこで、予熱室、加熱室と別々にし、しかも
N2ガスを用いて常時大気の浸入を防止し爆発混
合気を形成させない方法がある。このやり方は安
全ではあるが、N2を常時放散しているので、運
転費用が高いという欠点を持つている。 Therefore, we made the preheating chamber and heating chamber separate, and
There is a method that uses N2 gas to constantly prevent atmospheric intrusion and prevent the formation of explosive mixtures. Although this method is safe, it has the disadvantage of high operating costs because N 2 is constantly being released.
〈考案が解決しようとする問題点〉
本考案は、経済的でしかも爆発混合気の生ずる
恐れのない真空熱処理炉の排ガス排気装置を提供
するものである。<Problems to be Solved by the Invention> The present invention provides an exhaust gas exhaust system for a vacuum heat treatment furnace that is economical and free from the risk of generating an explosive mixture.
〈問題点を解決するための手段〉
本考案は可熱性ガスを発生する真空熱処理炉の
排ガス排気装置において、真空排気装置の排気ダ
クト端に第１の逆火防止装置を設け、該第１の逆
火防止装置を通過した排ガスを一旦大気中に排出
してから吸引する吸引ブロワを前記第１の逆火防
止装置に対向して設けた吸引フードとそれに連な
る第２の逆火防止装置の後方に設けたことを特徴
とする真空熱処理炉の排ガス排気装置である。<Means for solving the problem> The present invention provides an exhaust gas exhaust system for a vacuum heat treatment furnace that generates heatable gas, in which a first flashback prevention device is provided at the end of the exhaust duct of the vacuum exhaust system, and A suction hood is provided opposite to the first flashback prevention device and includes a suction blower that once discharges the exhaust gas that has passed through the flashback prevention device into the atmosphere and then sucks it into the atmosphere, and the back of the second flashback prevention device connected to the suction hood. This is an exhaust gas exhaust device for a vacuum heat treatment furnace, characterized in that it is installed in a vacuum heat treatment furnace.
〈作用〉 第１図および第２図は本考案の概念図である。<Effect> 1 and 2 are conceptual diagrams of the present invention.
予熱室，加熱室の排気ダクト５において、メカ
ニカルブースタ３および油回転ポンプ４からなる
真空排気装置出側のダクト端にそれぞれ第１の逆
火防止装置６を設け、それを通して一旦排ガスを
大気に放出させる。次に第１の逆火防止装置６に
対向する位置にフード７を、それに連なり第２の
逆火防止装置６を設け、さらに吸引ブロワ８を設
ける。こうすることにより一旦大気中に放出され
た排ガスが希釈された状態で吸引排気される。 In the exhaust ducts 5 of the preheating chamber and the heating chamber, a first flashback prevention device 6 is provided at each end of the duct on the exit side of the vacuum exhaust device consisting of the mechanical booster 3 and the oil rotary pump 4, and the exhaust gas is temporarily released to the atmosphere through it. let Next, a hood 7 is provided at a position facing the first flashback prevention device 6, a second flashback prevention device 6 is provided in series with the hood 7, and a suction blower 8 is further provided. By doing so, the exhaust gas once released into the atmosphere is sucked and exhausted in a diluted state.
第１図においては予熱室，加熱室の排気ダクト
をそれぞれ５ａ，５ｂとし、それぞれにフード７
を設置して吸引排気しているが、第２図に示すよ
うにフード７を共通にして、予熱室，加熱室とも
１つのフード７で希釈排気してもよい。 In Fig. 1, the exhaust ducts of the preheating chamber and the heating chamber are respectively designated 5a and 5b, and the hoods 7 and 7 are respectively designated as 5a and 5b.
However, as shown in FIG. 2, a common hood 7 may be used for both the preheating chamber and the heating chamber, and the same hood 7 may be used for dilution and exhaust.
なお、逆火防止装置としては一般に用いられて
いるフレームトラツプ弁とフレームアスターを組
合せたものを使用してもよい。 As the flashback prevention device, a combination of a commonly used flame trap valve and flame astor may be used.
また、本考案は予熱室，加熱室，冷却室の３室
を有する真空熱処理炉について説明したが、３室
を１室にまとめた真空熱処理炉の排ガス排気装置
にも適用できる。 Furthermore, although the present invention has been described with respect to a vacuum heat treatment furnace having three chambers, a preheating chamber, a heating chamber, and a cooling chamber, it can also be applied to an exhaust gas exhaust system for a vacuum heat treatment furnace in which three chambers are combined into one chamber.
次に本装置を使用した例を説明する。 Next, an example using this device will be explained.
装入量450Kg／chの鉄粉を、予熱室で500〜600
℃で３時間、加熱室で1200℃で３時間真空熱処理
したところ、予熱室からは0.3〜5Nm3／hrの速度
で、加熱室からは５〜20Nm3／hrの速度でCOガ
スが発生した。 Iron powder with a charging amount of 450 kg/ch is heated to 500 to 600 kg in the preheating room.
When vacuum heat treatment was performed at ℃ for 3 hours and at 1200℃ in a heating chamber for 3 hours, CO gas was generated from the preheating chamber at a rate of 0.3 to 5Nm 3 /hr and from the heating chamber at a rate of 5 to 20Nm 3 /hr. .
そこで本考案の吸引ブロワで処理したところ、
COの爆発限界は75〜12.5％であるが、濃度は大
気で希釈され３％程度になり、爆発の恐れは全く
なくなり安全であつた。 Therefore, when we treated it with the suction blower of this invention,
The explosive limit of CO is 75-12.5%, but the concentration was diluted in the atmosphere to about 3%, so there was no fear of explosion and it was safe.
〈考案の効果〉
本考案の真空熱処理炉の排ガス排気装置を用い
ることにより、高濃度のCO発生ガスも確実に希
釈され、また逆火も防止されるので、安全レベル
が一段と向上した。<Effects of the invention> By using the exhaust gas exhaust system of the vacuum heat treatment furnace of this invention, the high concentration of CO generated gas is reliably diluted and backfire is also prevented, so the safety level has been further improved.
第１図および第２図は本考案の概念図であり、
第３図は従来の排気系の概念図である。
１……真空熱処理炉、１ａ……予熱室、１ｂ…
…加熱室、１ｃ……冷却室、２ａ……装入扉、２
ｂ……中間扉、２ｃ……中間扉、２ｄ……抽
出扉、３……メカニカルブースタ、４……油回転
ポンプ、５……排気ダクト、６……逆火防止装
置、７……フード、８……吸引ブロワ。
Figures 1 and 2 are conceptual diagrams of the present invention,
FIG. 3 is a conceptual diagram of a conventional exhaust system. 1...Vacuum heat treatment furnace, 1a...Preheating chamber, 1b...
...Heating chamber, 1c...Cooling room, 2a...Charging door, 2
b... Intermediate door, 2c... Intermediate door, 2d... Extraction door, 3... Mechanical booster, 4... Oil rotary pump, 5... Exhaust duct, 6... Flashback prevention device, 7... Hood, 8...Suction blower.
Claims (1)
気装置において、真空排気装置の排気ダクト端に
第１の逆火防止装置を設け、該第１の逆火防止装
置を通過した排ガスを一旦大気中に排出してから
吸引する吸引ブロワを前記第１の逆火防止装置に
対向して設けた吸引フードとそれに連なる第２の
逆火防止装置の後方に設けたことを特徴とする真
空熱処理炉の排ガス排気装置。 In an exhaust gas exhaust system for a vacuum heat treatment furnace that generates flammable gas, a first flashback prevention device is provided at the end of the exhaust duct of the vacuum exhaust system, and the exhaust gas that has passed through the first flashback prevention device is once released into the atmosphere. Exhaust gas from a vacuum heat treatment furnace, characterized in that a suction blower for discharging and then suctioning is provided behind a suction hood facing the first flashback prevention device and a second flashback prevention device connected thereto. Exhaust device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16854287U JPH0448480Y2 (en) | 1987-11-05 | 1987-11-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16854287U JPH0448480Y2 (en) | 1987-11-05 | 1987-11-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0173699U JPH0173699U (en) | 1989-05-18 |
| JPH0448480Y2 true JPH0448480Y2 (en) | 1992-11-16 |
Family
ID=31457810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16854287U Expired JPH0448480Y2 (en) | 1987-11-05 | 1987-11-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0448480Y2 (en) |
-
1987
- 1987-11-05 JP JP16854287U patent/JPH0448480Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0173699U (en) | 1989-05-18 |
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