JPS5947007B2 - Heat exchange type continuous heat treatment furnace - Google Patents
Heat exchange type continuous heat treatment furnaceInfo
- Publication number
- JPS5947007B2 JPS5947007B2 JP18251581A JP18251581A JPS5947007B2 JP S5947007 B2 JPS5947007 B2 JP S5947007B2 JP 18251581 A JP18251581 A JP 18251581A JP 18251581 A JP18251581 A JP 18251581A JP S5947007 B2 JPS5947007 B2 JP S5947007B2
- Authority
- JP
- Japan
- Prior art keywords
- zone
- cooling
- cooling zone
- preheating
- starting
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Tunnel Furnaces (AREA)
Description
【発明の詳細な説明】
本発明は、省エネルギ一対策を施した連続熱処理炉に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous heat treatment furnace that takes energy saving measures.
従来、予熱帯、高温処理帯、冷却帯からなる連続熱処理
炉において、省エネルギーを図るために種々の考案が提
案されている。Conventionally, various ideas have been proposed to save energy in continuous heat treatment furnaces consisting of a pre-heating zone, a high-temperature treatment zone, and a cooling zone.
その一つとして、特公昭４５−１０６１０号公報がある
。One of them is Japanese Patent Publication No. 45-10610.
この考案は、予熱帯と冷却帯とが天井壁と空隙をもって
設けられた炉内仕切壁を介して平行するように、連続熱
処理炉をコ字形に配置し、前記予熱帯と冷却帯間にて熱
交換を行なうようにしたものである。This idea consists of arranging a continuous heat treatment furnace in a U-shape so that the pre-heating zone and the cooling zone are parallel to each other through a furnace partition wall provided with a space between the ceiling wall and the cooling zone. It is designed to perform heat exchange.
しかしながら、前記のものでは、予熱帯あるいは冷却帯
の同一帯域で炉内雰囲気ガスが混合し、処理材との温度
差がとりにくく、熱交換効率が低いという欠点を有して
いた。However, the above-mentioned method has the disadvantage that the furnace atmosphere gases mix in the same zone of the pre-cooling zone or the cooling zone, making it difficult to maintain a temperature difference between the furnace and the treated material, resulting in low heat exchange efficiency.
したがって、前記欠点を除去するため、本出願人は、先
に、特願昭５６−２４４６３号で、予熱帯と冷却帯とを
中間扉を介して高温処理帯の両側に、しかも一つのまと
まった帯域として連設し、前記予熱帯の終端部と冷却帯
の始端部、および冷却帯の終端部と予熱帯の始端部をそ
れぞれダクトで連通するとともに、予熱帯および冷却帯
に対流ファンを配置し、予熱帯と冷却帯との雰囲気ガス
を、冷却帯始端部→予熱帯終端部→予熱帯始端部→冷却
帯終端部→予熱帯始端部へと循環させ、予熱帯と冷却帯
との雰囲気ガスを処理材の移動力向に対して向流循環さ
せるとともに、前記各帯域にて、雰囲気ガスの対流を形
成させることによね、予熱帯、冷却帯で処理材を効率的
に熱交換させて省エネルギーを図った連続熱処理炉を提
案した。Therefore, in order to eliminate the above-mentioned drawbacks, the present applicant previously proposed in Japanese Patent Application No. 56-24463 that the pre-preparation zone and the cooling zone are arranged on both sides of the high-temperature treatment zone through an intermediate door, and that they are integrated into one unit. The preheating zone and the cooling zone are connected to each other as a zone, and the terminal end of the preheating zone and the starting end of the cooling zone are communicated through ducts, respectively, and convection fans are arranged in the preheating zone and the cooling zone. , the atmospheric gas between the pre-preparation zone and the cooling zone is circulated from the beginning of the pre-cooling zone → the end of the pre-preparation zone → the start of the pre-preparation zone → the end of the cooling zone → the start of the pre-preparation zone, and the atmospheric gas between the pre-preparation zone and the cooling zone is By circulating the gas countercurrently to the moving force direction of the treated material and forming convection of atmospheric gas in each zone, the treated material can efficiently exchange heat in the preheating zone and cooling zone, saving energy. We proposed a continuous heat treatment furnace that achieves this goal.
しかしながら、前記の方法では、対流ファンの攪拌作用
によね予熱帯および冷却帯において雰囲気ガス温度が帯
域全体にわたってはソ均−化し、雰囲気ガスと材料との
平均温度差が少なく、予熱および冷却最終温度が所望の
値になわにぐいとともに、所定の冷却速度を確保しにく
いという不具合を有する。However, in the above method, the temperature of the atmospheric gas in the preheating zone and the cooling zone is equalized over the entire zone due to the stirring action of the convection fan, and the average temperature difference between the atmospheric gas and the material is small, and the final temperature of the preheating and cooling zone is However, there are problems in that the temperature does not reach the desired value and it is difficult to secure a predetermined cooling rate.
本発明者らは、前記不具合を解決するため種々検討の結
果、予熱帯および冷熱帯が一つの帯域となっているため
、元来、始端側と終端側とで温度差を有する雰囲気ガス
が対流ファンにより攪拌され均一化されるためであるこ
とを知見した。As a result of various studies to solve the above-mentioned problems, the inventors of the present invention found that since the preheating zone and the cooling zone are one zone, the atmospheric gas, which originally has a temperature difference between the starting end and the ending end, is caused by convection. It was discovered that this was because the mixture was stirred and homogenized by the fan.
本発明は、前記知見にもとづいてなされたもので、加熱
手段を備えた高温処理帯に、予熱帯と冷却帯とを連設し
た連続熱処理炉において、前記予熱帯と冷却帯とを天井
に対流ファンを備えた複数ゾーンに区画するとともに、
前記予熱帯の終端ゾーンと冷却帯の始端ゾーンをダクト
で連通し、冷却帯の雰囲気ガスを、冷却帯始端ゾーンか
ら予熱帯終端ゾーン、予熱帯始端ゾーンへと流すことに
より、予熱帯と冷却帯との雰囲気ガスに各帯域内におい
て段階的な温度差を確保し前記不具合を解決した熱交換
式連続熱処理炉を提供しようとするものである。The present invention has been made based on the above findings, and includes a continuous heat treatment furnace in which a preheating zone and a cooling zone are connected to a high-temperature treatment zone equipped with a heating means. In addition to dividing the area into multiple zones equipped with fans,
The terminal zone of the pre-heating zone and the starting zone of the cooling zone are connected through a duct, and the atmospheric gas in the cooling zone is allowed to flow from the starting zone of the cooling zone to the terminal zone of the pre-cooling zone and the starting zone of the pre-cooling zone. The present invention aims to provide a heat exchange type continuous heat treatment furnace that solves the above-mentioned problems by securing a stepwise temperature difference in each zone of the atmospheric gas.
つぎに、本発明を実施例である図面にしたがって説明す
る。Next, the present invention will be explained according to the drawings which are examples.
第１図および第２図は、第１実施例を示し、連続熱処理
炉Ｔは、予熱帯Ａ、直火式バーナ１を備えた高温処理帯
である加熱帯Ｂおよび冷却帯Ｃとからなｈ、各帯域Ａ、
Ｂ、Ｃは仕切壁２，２により、また、予熱帯Ａおよび冷
却帯Ｃ＆！仕切壁３゜４により予熱帯Ａは第１、第２ゾ
ーン５ ａｔ ５ ｂに、冷却帯Ｃは第１〜第３シーｙ
５ ａ ｔ ５ ｂ ＠ ５ ｃに区画されていると
ともに、各分割ゾーンおよび加熱帯Ｂ＆Ｃは循環（対流
）ファンＩを備えている。1 and 2 show a first embodiment, in which a continuous heat treatment furnace T consists of a preheating zone A, a heating zone B which is a high temperature treatment zone equipped with a direct-fired burner 1, and a cooling zone C. , each band A,
B and C are separated by partition walls 2 and 2, and also have a pre-heating zone A and a cooling zone C&! Due to the partition wall 3゜4, the preheating zone A is divided into the first and second zones 5 at 5 b, and the cooling zone C is divided into the first to third zones y.
Each divided zone and heating zone B&C is equipped with a circulation (convection) fan I.
そして、前記予熱帯への終端ゾーンである第２ゾーン５
ｂと冷却帯Ｃの始端ゾーンである第１ゾーン６ａ、およ
び予熱帯への始端ゾーンである第１ゾーン５ａと冷却帯
Ｃの終端ゾーンである第３ゾーン６Ｃとは、それぞれダ
クト８，９で連通され、雰囲気ガスは、冷却帯第１ゾー
ン６ａ→予熱帯第２ゾーン５ｂ→予熱帯第１ゾーン５ａ
→冷却帯第３ゾーン６ｃ→冷却帯第２ゾーン６ｂ→冷却
帯第１ゾーン６ａへと循環するようになっている。A second zone 5 is the terminal zone to the pre-preparation zone.
b and the first zone 6a which is the starting end zone of the cooling zone C, and the first zone 5a which is the starting end zone to the preheating zone and the third zone 6C which is the ending zone of the cooling zone C are ducts 8 and 9, respectively. The atmosphere gas is communicated from cooling zone first zone 6a to pre-preparation zone second zone 5b to pre-preparation zone first zone 5a.
→ Third cooling zone 6c → Second cooling zone 6b → First cooling zone 6a.
なお、実施例においては、予熱帯への第１．第２ゾーン
５ａ、５ｂおよび冷却帯Ｃの第１ゾーン６ａには、下面
に多数の噴流ノズル孔１１を有するフード１０が設けら
れ、前記循環ファン７にもとずくフード１０内の正圧あ
るいはフード１０外の負圧によね雰囲気ガスは、フード
１０内及び外に開口するダクト８，９により前述した循
環を行なうものである。In addition, in the embodiment, the first. The second zones 5a, 5b and the first zone 6a of the cooling zone C are provided with a hood 10 having a large number of jet nozzle holes 11 on the lower surface. The atmospheric gas due to the negative pressure outside the hood 10 is circulated as described above through the ducts 8 and 9 opening into and outside the hood 10.
また、場合によっては、別途ブロワをダクト８，９に設
けてもよいことは勿論である。Moreover, it is of course possible to separately provide blowers in the ducts 8 and 9 depending on the case.
したがって、処理材Ｗが装入扉１２ａから予熱帯Ａに装
入され、搬送ローラ１３により加熱帯Ｂ。Therefore, the processing material W is charged into the preheating zone A through the charging door 12a, and transferred to the heating zone B by the conveyance rollers 13.
冷却帯Ｃを経て熱処理され、抽出扉１２ｂから抽出され
るが、処理材Ｗは、予熱帯への第１ゾーン５ａで第２ゾ
ーン５ｂからの約５１０℃の雰囲気ガスで予熱される。The treated material W is heat-treated through the cooling zone C and extracted from the extraction door 12b, but the treated material W is preheated in the first zone 5a to the preheating zone with atmospheric gas at about 510° C. from the second zone 5b.
そして、処理材Ｗは次の第２ゾーン５ｂで冷却帯Ｃの第
１ゾーン６ａからの高温雰囲気ガスおよび加熱帯Ｂから
の燃焼排ガスの約６００℃となった混合ガスで予熱され
て加熱帯Ｂへ装入され、こ＼で７２０°ＱｉＣ加熱され
る。Then, the treated material W is preheated in the next second zone 5b with a mixed gas of the high temperature atmospheric gas from the first zone 6a of the cooling zone C and the combustion exhaust gas from the heating zone B at a temperature of about 600°C. It is charged into the tank and heated at 720°QiC.
一方、加熱帯Ｂで処理された処理材Ｗシコ冷却帯Ｃの第
１ゾーン６ａで第２ゾーン６ｂからの約４２０℃となっ
た低温雰囲気ガスで冷却される。On the other hand, the treated material W treated in the heating zone B is cooled in the first zone 6a of the cooling zone C by the low-temperature atmospheric gas of approximately 420° C. from the second zone 6b.
なお、この第１ゾーン６ａでは、雰囲気ガスは加熱帯Ｂ
から約７２０°Ｃに加熱された処理材Ｗによって加熱さ
れるため約５５０℃に昇温して前述のように予熱帯Ａの
第２ゾーン５ｂに供給されるものである。Note that in this first zone 6a, the atmospheric gas is in the heating zone B.
Since the treatment material W is heated to approximately 720° C., the temperature is raised to approximately 550° C. and the treated material W is supplied to the second zone 5b of the preheating zone A as described above.
なお、１４は循環ガス制御ダンパーである。Note that 14 is a circulating gas control damper.
ついで、処理材Ｗは同様にして第２、第３ゾーン６ｂ、
６ｃで所定冷却曲線に沿って冷却され、抽出扉１２ｂか
ら抽出されろ。Then, the treated material W is similarly transferred to the second and third zones 6b,
6c, it is cooled along a predetermined cooling curve and extracted from the extraction door 12b.
第３図は、前述の場合における処理材温度イと各帯域（
ゾーンを含む）の雰囲気ガス温度口を示したものである
。Figure 3 shows the temperature of the treated material i and each zone (
This figure shows the atmospheric gas temperature ports (including zones).
前記直火式バーナ１は、ラジアントチューブあるいは電
熱体であってもよく、また予熱帯への始端部である第１
ゾーン５ａと冷却帯Ｃの終端部である第３ゾーン６ｃを
連通するダクト９は、場合によって省略してもよい。The direct-fired burner 1 may be a radiant tube or an electric heating element, and the first
The duct 9 that connects the zone 5a and the third zone 6c, which is the terminal end of the cooling zone C, may be omitted depending on the case.
第４図は第２実施例を示し、加熱帯Ｂのバーナな間接加
熱手段であるラジアントチューブ１５とし、その高温燃
焼排ガスで、冷却帯Ｃの第１ゾーン６ａと予熱帯Ａの第
２ゾーン５ｂとを連通ずるダクト８を加熱し、処理＃Ｗ
の予熱をより有効になそうとするものである。FIG. 4 shows a second embodiment, in which a radiant tube 15 is used as an indirect heating means such as a burner in the heating zone B, and the high-temperature combustion exhaust gas is used in the first zone 6a of the cooling zone C and the second zone 5b of the pre-preparation zone A. The duct 8 that communicates with the
The aim is to make preheating more effective.
すなわち、図において、ダクト８は、ダクト８とラジア
ントチューブ１５の排気集合ダクト１８とで構成される
熱交換器１７中を貫通し、ラジアントチューブバーナ１
６の高温排気ガスは前記ダクト８を流れる冷却帯Ｃの第
１ゾーン６ａからの排気を約７００°ＣＶｃ加熱したの
ち熱交換器１９でラジアントチューブバーナ１６の燃焼
用空気を予熱したのち排気されるようになっている。That is, in the figure, the duct 8 penetrates the inside of the heat exchanger 17 composed of the duct 8 and the exhaust collection duct 18 of the radiant tube burner 1.
The high-temperature exhaust gas No. 6 heats the exhaust gas from the first zone 6a of the cooling zone C flowing through the duct 8 by approximately 700°CVc, and then preheats the combustion air of the radiant tube burner 16 in the heat exchanger 19 before being exhausted. It looks like this.
なお、２０はブロワである。Note that 20 is a blower.
前記の説明で明らかなように、本発明によれば。According to the invention, as is clear from the foregoing description.
高温処理帯から冷却帯へ搬送された高温処理材の冷却熱
によね高温となった雰囲気ガスを、冷却帯始端ゾーンか
らダクトを介して予熱帯始端ゾーンに、処理材の移動方
向に対して対流ファンによね対流を与えなから向流させ
て処理材を予熱する一方、予熱帯および冷却帯は、天井
に対流ファンを備えた複数ゾーンに区画されて、隣接す
るゾーンの雰囲気ガスが直接混合し合わないため、隣接
するゾーン間の雰囲気ガス温度が、常に、通過する処理
材温度よす高いか、あるいは低くなっており、処理材と
循環雰囲気ガスとの保有熱量を効率よく熱交換させ、大
巾な省エネルギーを図ることができるとともに、処理材
を所定冷却曲線にそって冷却することができる。Atmospheric gas, which has become high in temperature due to the cooling heat of the high-temperature processing material transported from the high-temperature processing zone to the cooling zone, is convected from the cooling zone start zone to the pre-preparation zone start zone via a duct in the direction of movement of the processing material. The material to be treated is preheated by using a counterflow rather than a convection fan, while the preheating zone and cooling zone are divided into multiple zones equipped with convection fans on the ceiling, allowing atmospheric gases from adjacent zones to mix directly. As a result, the temperature of the atmospheric gas between adjacent zones is always higher or lower than the temperature of the processing material passing through, and the amount of heat held between the processing material and the circulating atmospheric gas is efficiently exchanged, resulting in a large Not only can a wide range of energy be saved, but also the treated material can be cooled along a predetermined cooling curve.
また、第２実施例のように、予熱帯への導入雰囲気ガス
をラジアントチューブの燃焼排ガスで加熱し、予熱帯の
始端部から冷却帯の終端部に予熱帯の降温雰囲気を導入
すれば、さらに予熱効果と保護雰囲気の消費量の軽減を
図ることができる。In addition, as in the second embodiment, if the atmospheric gas introduced into the pre-heating zone is heated by the combustion exhaust gas of the radiant tube and the temperature-lowering atmosphere of the pre-heating zone is introduced from the starting end of the pre-heating zone to the terminal end of the cooling zone, it is possible to further increase the temperature. The preheating effect and the consumption of protective atmosphere can be reduced.
なお、冷却帯Ｃでの雰囲気温度の調節は、循環ガス制御
ダンパー１４、冷却帯Ｃの第１〜３ゾーン６ａ〜６ｃに
設けた図示しない冷却用空気導入ダンパおよび必要に応
じて設けられる加熱手段にて行い、所定の冷却曲線にそ
って処理材を冷却するものである。Note that the atmospheric temperature in the cooling zone C is adjusted by the circulating gas control damper 14, cooling air introduction dampers (not shown) provided in the first to third zones 6a to 6c of the cooling zone C, and heating means provided as necessary. The processing material is cooled along a predetermined cooling curve.
第１図は本発明の熱交換式連続熱処理炉の平面図、第２
図は縦断面図で、第３図は雰囲気ガス温度と処理材温度
との関係を示すグラフ、第４図は他の実施例の要部に関
する説明図である。
１・・・・・・直火式バーナ、２，３，４・曲・仕切壁
、５ａｔ ５ｂ、６ａ、６ｂ、６ｃ＝ゾーン、７・・
・対流ファン、８，９・・・・・・ダクト、１５・・・
・・・ラジアントチューブ、１７・・・・・・熱交換器
、Ａ・・・・・・予熱帯、Ｂ・・・・・・加熱帯、Ｃ・
・・・・・冷却帯。FIG. 1 is a plan view of the heat exchange type continuous heat treatment furnace of the present invention, and FIG.
The figure is a longitudinal cross-sectional view, FIG. 3 is a graph showing the relationship between atmospheric gas temperature and processing material temperature, and FIG. 4 is an explanatory diagram of the main part of another embodiment. 1... Direct fire burner, 2, 3, 4, curved/partition wall, 5at 5b, 6a, 6b, 6c = zone, 7...
・Convection fan, 8, 9... Duct, 15...
... Radiant tube, 17 ... Heat exchanger, A ... Preheating zone, B ... Heating zone, C.
...cooling zone.
Claims (1)
を連設した連続熱処理炉において、前記予熱帯と冷却帯
とを天井に対流ファンを備えた複数ゾーンに区画すると
ともに、前記予熱帯の終端ゾーンと冷却帯の始端ゾーン
をダクトで連通し、冷却帯の雰囲気ガスを、冷却帯始端
ゾーンから予熱帯終端ゾーン、予熱帯始端ゾーンへと流
すことを特徴とする熱交換式連続熱処理炉。 ２ 加熱手段を備えた高温処理帯に、予熱帯と冷却帯と
を連設した連続熱処理炉において、前記予熱帯と冷却帯
とを天井に対流ファンを備えた複数ゾーンに区画すると
ともに、前記予熱帯の終端ゾーンと冷却帯の始端ゾーン
をダクトで連通し、かつ、冷却帯の終帯グーンと予熱帯
の始帯ゾーンをダクトで連通し、冷却帯と予熱帯との雰
囲気ガスを、冷却帯始端ゾーンから予熱帯終端ゾーン、
予熱帯始端ゾーンを経て冷却帯終端ゾーンへと循環させ
ることを特徴とする熱交換式連続処理炉。[Claims] 1. A continuous heat treatment furnace in which a pre-heating zone and a cooling zone are connected to a high-temperature treatment zone equipped with a heating means, and the pre-heating zone and the cooling zone are arranged in multiple zones equipped with a convection fan on the ceiling. At the same time, the terminal zone of the preheating zone and the starting zone of the cooling zone are connected through a duct, and the atmospheric gas in the cooling zone is made to flow from the starting zone of the cooling zone to the terminal zone of the preheating zone and the starting zone of the preheating zone. Heat exchange type continuous heat treatment furnace. 2. In a continuous heat treatment furnace in which a preheating zone and a cooling zone are connected to a high temperature treatment zone equipped with a heating means, the preheating zone and the cooling zone are divided into multiple zones equipped with convection fans on the ceiling, and the The terminal zone of the tropics and the starting zone of the cooling zone are connected by a duct, and the terminal zone of the cooling zone and the starting zone of the pre-cooling zone are connected by a duct, and the atmospheric gas between the cooling zone and the pre-cooling zone is connected to the starting zone of the cooling zone. zone to preheating zone termination zone,
A heat exchange type continuous processing furnace characterized by circulation through a preheating zone start zone and a cooling zone end zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18251581A JPS5947007B2 (en) | 1981-11-12 | 1981-11-12 | Heat exchange type continuous heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18251581A JPS5947007B2 (en) | 1981-11-12 | 1981-11-12 | Heat exchange type continuous heat treatment furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5884921A JPS5884921A (en) | 1983-05-21 |
| JPS5947007B2 true JPS5947007B2 (en) | 1984-11-16 |
Family
ID=16119642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18251581A Expired JPS5947007B2 (en) | 1981-11-12 | 1981-11-12 | Heat exchange type continuous heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5947007B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8328551B2 (en) * | 2002-09-26 | 2012-12-11 | Btu International, Inc. | Convection furnace thermal profile enhancement |
| CN103882187B (en) * | 2014-04-04 | 2016-01-20 | 江苏巨鑫磁业有限公司 | A kind of neodymium-iron-boron magnetic material crystallization system |
-
1981
- 1981-11-12 JP JP18251581A patent/JPS5947007B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5884921A (en) | 1983-05-21 |
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