JPH10176225A - Continuous annealing furnace of metallic strip - Google Patents
Continuous annealing furnace of metallic stripInfo
- Publication number
- JPH10176225A JPH10176225A JP35293396A JP35293396A JPH10176225A JP H10176225 A JPH10176225 A JP H10176225A JP 35293396 A JP35293396 A JP 35293396A JP 35293396 A JP35293396 A JP 35293396A JP H10176225 A JPH10176225 A JP H10176225A
- Authority
- JP
- Japan
- Prior art keywords
- zone
- continuous annealing
- plating bath
- annealing furnace
- refiner
- 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
Links
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は金属ストリップの連
続焼鈍炉、特に下流側がメッキ浴へ接続された金属スト
リップの連続焼鈍炉に関する。金属ストリップを炉内搬
送しつつ所定の雰囲気ガス下に焼鈍処理し、引き続きメ
ッキ浴に浸漬して、その表面にメッキを施すことが行な
われる。本発明はかかる場合に使用される連続焼鈍炉の
改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous annealing furnace for metal strip, and more particularly to a continuous annealing furnace for metal strip having a downstream side connected to a plating bath. The metal strip is annealed under a predetermined atmospheric gas while being conveyed in a furnace, and subsequently immersed in a plating bath to perform plating on its surface. The present invention relates to an improvement in a continuous annealing furnace used in such a case.
【０００２】[0002]
【従来の技術】従来、上記のような金属ストリップの連
続焼鈍炉として一般に、炉の上流側から下流側に向かい
予熱帯、加熱帯、保持帯及び冷却帯がこの順で形成され
たものが使用されている。加熱帯は上流側の直接加熱帯
と下流側の間接加熱帯とに分けられ、直接加熱帯では加
熱源として直火バーナを用い、この直火バーナを空気比
１．０未満で燃焼させ、結果的に形成される無酸化雰囲
気ガス下に金属ストリップを直接加熱し、また間接加熱
帯では加熱源としてラジアントチューブを用い、還元雰
囲気ガス下に金属ストリップを間接加熱している。保持
帯及び冷却帯も還元雰囲気ガス下に保持されており、最
下流側の冷却帯はダウンシュート及びスナウトを介しメ
ッキ浴へ接続されていて、予熱帯、加熱帯、保持帯及び
冷却帯を備える連続焼鈍炉で所定通りに連続焼鈍処理し
た金属ストリップを引き続きダウンシュート及びスナウ
トを介しメッキ浴に浸漬し、その表面にメッキを施して
いる。2. Description of the Related Art Conventionally, as a continuous annealing furnace for a metal strip as described above, a furnace in which a pre-tropical zone, a heating zone, a holding zone and a cooling zone are formed in this order from upstream to downstream of the furnace is generally used. Have been. The heating zone is divided into a direct heating zone on the upstream side and an indirect heating zone on the downstream side. In the direct heating zone, a direct fire burner is used as a heating source, and the direct fire burner is burned at an air ratio of less than 1.0. The metal strip is directly heated under a non-oxidizing atmosphere gas formed in a typical manner, and in the indirect heating zone, a radiant tube is used as a heating source, and the metal strip is indirectly heated under a reducing atmosphere gas. The holding zone and the cooling zone are also held under the reducing atmosphere gas, and the lowermost cooling zone is connected to the plating bath via a down shoot and a snout, and includes a pre-tropical zone, a heating zone, a holding zone, and a cooling zone. The metal strip that has been continuously annealed in a continuous annealing furnace as described above is immersed in a plating bath via a down shoot and a snout, and the surface is plated.
【０００３】ところで、上記のように金属ストリップを
連続焼鈍処理し、引き続きメッキ処理すると、間接加熱
帯、保持帯、冷却帯及びダウンシュート内の還元雰囲気
ガスは金属ストリップと共に持ち込まれた酸素や水分、
更にはメッキ浴から蒸発してこれらの内部へと逆流して
きたメッキ浴成分により汚染される。従来の連続焼鈍炉
では、このような汚染雰囲気ガスを直接加熱帯で燃焼し
て排気している。しかし、汚染雰囲気ガスとはいっても
その殆どは本来の還元雰囲気ガスであるので、かかる汚
染雰囲気ガスをそのまま直接加熱帯で燃焼して排気する
のは還元雰囲気ガスの著しい無駄使いである。また汚染
雰囲気ガスをいわばその炉内ガス流にまかせて単に直接
加熱帯で燃焼するだけでは、メッキ浴から蒸発してダウ
ンシュート、冷却帯、保持帯及び間接加熱帯内へ逆流し
てきたメッキ浴成分を充分に除去できず、そのためメッ
キ浴成分がこれらの内部における金属ストリップ表面や
機械部品表面に固着し、結局は得られるメッキ製品にメ
ッキ斑や傷を生じてその品質を損なう。When the metal strip is subjected to continuous annealing as described above and subsequently to plating, the reducing atmosphere gas in the indirect heating zone, the holding zone, the cooling zone, and the down chute is reduced to oxygen, moisture,
Furthermore, it is contaminated by the components of the plating bath which evaporate from the plating bath and flow back into these components. In a conventional continuous annealing furnace, such a polluted atmosphere gas is directly combusted in a heating zone and exhausted. However, since most of the polluted atmosphere gas is the original reducing atmosphere gas, burning the polluted atmosphere gas directly in the heating zone and exhausting it is a significant waste of the reducing atmosphere gas. If the polluting atmosphere gas is left to the gas flow inside the furnace and simply burned in the direct heating zone, the plating bath components that evaporate from the plating bath and flow back into the downshoot, cooling zone, holding zone and indirect heating zone. Cannot be sufficiently removed, so that the components of the plating bath adhere to the surfaces of the metal strips and machine parts inside these components, resulting in plating spots and scratches on the resulting plated product, which impairs its quality.
【０００４】[0004]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、従来の連続焼鈍炉では、汚染雰囲気ガスを
単にそのまま直接加熱帯で燃焼して排気するだけである
ため、還元雰囲気ガスが無駄になっており、また得られ
るメッキ製品の品質を損なう点である。The problem to be solved by the present invention is that in a conventional continuous annealing furnace, the polluting atmosphere gas is simply burned as it is in the direct heating zone and exhausted. This is wasteful and impairs the quality of the plated product obtained.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決する本
発明は、下流側がメッキ浴へ接続された金属ストリップ
の連続焼鈍炉において、間接加熱帯と保持帯、冷却帯及
び／又はダウンシュートとを連絡する配管途中にリファ
イナが介装されており、該リファイナは濾過器、クー
ラ、吸引ファン、脱酸素器及び除湿器を備えていて、該
リファイナにより該間接加熱帯から吸引した汚染雰囲気
ガス中のメッキ浴成分、酸素及び水分を除去した後の精
製雰囲気ガスを保持帯、冷却帯及び／又はダウンシュー
トへ戻すようにして成ることを特徴とする金属ストリッ
プの連続焼鈍炉に係る。According to the present invention, there is provided a continuous annealing furnace for a metal strip having a downstream side connected to a plating bath, wherein an indirect heating zone, a holding zone, a cooling zone and / or a down chute are provided. A refiner is interposed in the middle of the pipe for communicating the filter, and the refiner is provided with a filter, a cooler, a suction fan, a deoxygenator, and a dehumidifier. A refining atmosphere gas after removing a plating bath component, oxygen and water from the plating bath, and returning the purified atmosphere gas to a holding zone, a cooling zone and / or a down chute.
【０００６】本発明に係る連続焼鈍炉でも、炉の上流側
から下流側に向かい予熱帯、加熱帯、保持帯及び冷却帯
がこの順で形成されており、場合によっては加熱帯と保
持帯との間に別の冷却帯が形成されている。加熱帯は上
流側の直接加熱帯と下流側の間接加熱帯とに分けられ、
最下流側の冷却帯はダウンシュート及びスナウトを介し
メッキ浴へ接続されている。間接加熱帯、保持帯、冷却
帯及び結果的にダウンシュート内は還元雰囲気ガス下に
保持されており、したがって金属ストリップは、予熱
帯、加熱帯（直接加熱帯及び間接加熱帯）、保持帯及び
冷却帯を備える連続焼鈍炉で所定通り連続焼鈍処理され
た後、引き続きダウンシュート及びスナウトを介しメッ
キ処理される。In the continuous annealing furnace according to the present invention, a pre-tropical zone, a heating zone, a holding zone, and a cooling zone are formed in this order from the upstream side to the downstream side of the furnace. Another cooling zone is formed between them. The heating zone is divided into an upstream direct heating zone and a downstream indirect heating zone,
The most downstream cooling zone is connected to the plating bath via a down chute and a snout. The indirect heating zone, the holding zone, the cooling zone and, consequently, the downshooting are kept under reducing atmosphere gas, so that the metal strip is pre-tropical, the heating zone (direct and indirect heating zone), the holding zone and After being subjected to continuous annealing as specified in a continuous annealing furnace having a cooling zone, plating is performed via a down shoot and a snout.
【０００７】本発明に係る連続焼鈍炉では、炉外に汚染
雰囲気ガスを精製するリファイナが設置されており、こ
のリファイナは間接加熱帯と保持帯、冷却帯及び／又は
ダウンシュートとを連絡する配管途中に介装されてい
る。リファイナは濾過器、クーラ、吸引ファン、脱酸素
器及び除湿器を備えており、このリファイナによって間
接加熱帯から吸引した汚染雰囲気ガス中のメッキ浴成
分、酸素及び水分を除去した後の精製雰囲気ガスを保持
帯、冷却帯及び／又はダウンシュートへ戻すようになっ
ている。[0007] In the continuous annealing furnace according to the present invention, a refiner for purifying a contaminated atmosphere gas is installed outside the furnace, and this refiner is a pipe connecting the indirect heating zone to the holding zone, the cooling zone and / or the down chute. It is interposed on the way. The refiner is equipped with a filter, a cooler, a suction fan, a deoxygenator, and a dehumidifier. The refiner atmosphere gas after removing the plating bath components, oxygen, and moisture in the contaminated atmosphere gas sucked from the indirect heating zone by the refiner. To the holding zone, cooling zone and / or downshoot.
【０００８】リファイナの濾過器は密閉系容器内にフィ
ルタメディア、例えば濾紙、濾布或は濾網等を備えるも
ので、汚染雰囲気ガス中の主としてメッキ浴成分を除去
するためのものである。また脱酸素器は密閉系容器内に
脱酸素剤、例えば鉄、炭化鉄、第二鉄塩等の鉄系粉粒を
備えるもので、汚染雰囲気ガス中の酸素を除去するため
のものである。更に除湿器は密閉系容器内に脱水剤、例
えばモレキュラーシーブを備えるもので、汚染雰囲気ガ
ス中の水分を除去するためのものである。[0008] The filter of the refiner is provided with a filter medium, for example, filter paper, filter cloth or filter net, in a closed system container, and is mainly for removing plating bath components in the polluted atmosphere gas. The deoxygenator is provided with a deoxidizer, for example, iron-based powder such as iron, iron carbide, and ferric salt in a closed system container, and is for removing oxygen in a polluted atmosphere gas. Further, the dehumidifier is provided with a dehydrating agent, for example, a molecular sieve in a closed system container, and is for removing moisture in the polluted atmosphere gas.
【０００９】本発明によると、リファイナによって間接
加熱帯から汚染雰囲気ガスを強制的に吸引し、吸引した
汚染雰囲気ガス中のメッキ浴成分、酸素及び水分を除去
して、これらを除去した後の精製雰囲気ガスすなわち還
元雰囲気ガスを保持帯、冷却帯及び／又はダウンシュー
トへと戻して循環再使用するので、還元雰囲気ガスの無
駄がなく、また高品質のメッキ製品を得ることができ
る。かかる本発明の効果は、メッキ浴成分として融点が
低い亜鉛或は亜鉛合金、特に亜鉛−アルミニウム合金を
用いる場合に大きい。亜鉛の融点は４６０℃程度であっ
てもともとそれだけ蒸発し易いことに加え、メッキ浴成
分として亜鉛−アルミニウム合金を用いる場合にはアル
ミニウムの融点との関係でメッキ浴を６００℃程度に加
熱保持するので、更にそれだけ亜鉛が蒸発し易くなるか
らである。According to the present invention, the contaminated atmosphere gas is forcibly sucked from the indirect heating zone by the refiner, and the plating bath components, oxygen and moisture in the sucked contaminated atmosphere gas are removed, and the refinement after removing these components is performed. Since the atmosphere gas, that is, the reducing atmosphere gas is returned to the holding zone, the cooling zone and / or the down chute and circulated and reused, there is no waste of the reducing atmosphere gas and a high-quality plated product can be obtained. The effect of the present invention is great when zinc or a zinc alloy having a low melting point, particularly a zinc-aluminum alloy, is used as a plating bath component. In addition to the fact that zinc has a melting point of about 460 ° C., in addition to the fact that it is easily evaporated, in addition, when a zinc-aluminum alloy is used as a plating bath component, the plating bath is heated and held at about 600 ° C. in relation to the melting point of aluminum. This is because zinc is more likely to evaporate.
【００１０】[0010]
【発明の実施の形態】図１は本発明に係る連続焼鈍炉の
全体を略示する縦断面図、図２は図１と同じ連続焼鈍炉
のリファイナを示す部分拡大正面図である。図示した連
続焼鈍炉は炉の上流側から下流側に向かい予熱帯１１、
直接加熱帯１２、間接加熱帯１３、冷却帯１４、保持帯
１５及び冷却帯１６を備え、最下流側の冷却帯１６はダ
ウンシュート２１及びスナウト２２を介しポット２３に
加熱保持したメッキ浴２４へ接続されている。後述する
リファイナ及びこれに関連する部分を除き、図示した連
続焼鈍炉を構成する予熱帯１１、直接加熱帯１２、間接
加熱帯１３、冷却帯１４、保持帯１５及び冷却帯１６は
従来の連続焼鈍炉と同様である。間接加熱帯１３、冷却
帯１４、保持帯１５、冷却帯１６及び結果的にダウンシ
ュート２１内は例えばＨ2＋Ｎ2の還元雰囲気ガス下に保
持されており、したがって金属ストリップＳは、予熱帯
１１、直接加熱帯１２、間接加熱帯１３、冷却帯１４、
保持帯１５及び冷却帯１６を備える連続焼鈍炉で所定通
り連続焼鈍処理された後、引き続きダウンシュート２１
及びスナウト２２を介しメッキ処理される。FIG. 1 is a longitudinal sectional view schematically showing an entire continuous annealing furnace according to the present invention, and FIG. 2 is a partially enlarged front view showing a refiner of the same continuous annealing furnace as FIG. The illustrated continuous annealing furnace moves from the upstream side of the furnace to the downstream side of the pre-tropical zone 11,
It has a direct heating zone 12, an indirect heating zone 13, a cooling zone 14, a holding zone 15 and a cooling zone 16, and a cooling zone 16 at the most downstream side is transferred to a plating bath 24 heated and held in a pot 23 via a down chute 21 and a snout 22. It is connected. Except for a refiner and a part related thereto which will be described later, the pre-tropical zone 11, the direct heating zone 12, the indirect heating zone 13, the cooling zone 14, the holding zone 15 and the cooling zone 16, which constitute the illustrated continuous annealing furnace, are formed by conventional continuous annealing. Same as furnace. The indirect heating zone 13, the cooling zone 14, the holding zone 15, the cooling zone 16 and consequently the down chute 21 are held under a reducing atmosphere gas of, for example, H 2 + N 2. , Direct heating zone 12, indirect heating zone 13, cooling zone 14,
After being subjected to continuous annealing as specified in a continuous annealing furnace having a holding zone 15 and a cooling zone 16,
And a plating process via the snout 22.
【００１１】炉外には間接加熱帯１３と冷却帯１４、保
持帯１５、冷却帯１６及びダウンシュート２１とを連絡
する配管３１が設けられており、配管３１の最上流側に
リファイナ３２が介装されている。リファイナ３２は、
上流側から下流側に向かい、切替バルブ４１〜４４及び
バルブ５１ａ，５１ｂ〜５５ａ，５５ｂを介して接続さ
れた濾過器６１，６２、クーラ７１、吸引ファン７２、
脱酸素器８１及び除湿器９１，９２を備えている。濾過
器６１，６２は密閉系容器内にフィルタメディアを備え
るもので、切替使用が可能に２基が並設されている。ま
た脱酸素器８１は密閉系容器内に脱酸素剤を備えるもの
である。更に除湿器９１，９２は密閉系容器内に脱水剤
を備えるもので、切替使用が可能に２基が並設されてい
る。Outside the furnace, there is provided a pipe 31 for connecting the indirect heating zone 13 with the cooling zone 14, the holding zone 15, the cooling zone 16 and the down chute 21, and a refiner 32 is provided at the most upstream side of the pipe 31. Is equipped. Refiner 32
From the upstream side to the downstream side, the filters 61 and 62, the cooler 71, the suction fan 72 connected via the switching valves 41 to 44 and the valves 51a, 51b to 55a and 55b,
A deoxygenator 81 and dehumidifiers 91 and 92 are provided. The filters 61 and 62 each include a filter medium in a closed system container, and two filters are provided in parallel so as to be switchable. The oxygen absorber 81 has an oxygen absorber inside a closed container. Further, the dehumidifiers 91 and 92 are provided with a dehydrating agent in a closed system container, and two units are provided side by side so as to be switchable.
【００１２】間接加熱帯１３内の汚染雰囲気ガスを吸引
ファン７２で吸引する。吸引した汚染雰囲気ガス中の主
としてメッキ浴成分を濾過器６１，６２で除去する。次
にメッキ浴成分を除去した汚染雰囲気ガスをクーラ７１
で冷却した後、該汚染雰囲気ガス中の酸素を脱酸素器８
１で除去する。最後にメッキ浴成分及び酸素を除去した
汚染雰囲気ガス中の水分を除湿器９１，９２で除去す
る。かくして汚染雰囲気ガスからメッキ浴成分、酸素及
び水分を除去した精製雰囲気ガスすなわち還元雰囲気ガ
スを、バルブ３１ａ〜３１ｄの開閉操作により冷却帯１
４、保持帯１５、冷却帯１６及び／又はダウンシュート
２１へ戻して循環再使用する。The contaminated atmosphere gas in the indirect heating zone 13 is sucked by the suction fan 72. Plating bath components mainly in the contaminated atmosphere gas sucked are removed by the filters 61 and 62. Next, the contaminated atmosphere gas from which the plating bath components have been removed is supplied to the cooler 71.
After cooling with oxygen, the oxygen in the polluted atmosphere gas is
Remove with 1. Finally, the moisture in the contaminated atmosphere gas from which the plating bath components and oxygen have been removed is removed by dehumidifiers 91 and 92. The purified atmosphere gas, ie, the reducing atmosphere gas, from which the plating bath components, oxygen, and moisture have been removed from the contaminated atmosphere gas, is supplied to the cooling zone 1 by opening and closing the valves 31a to 31d.
4. Return to the holding zone 15, the cooling zone 16 and / or the down chute 21 for circulating reuse.
【００１３】[0013]
【発明の効果】既に明らかなように、以上説明した本発
明には、還元雰囲気ガスの無駄がなく、また高品質のメ
ッキ製品を得ることができるという効果がある。As is apparent from the above description, the present invention described above has an effect that a reducing atmosphere gas is not wasted and a high quality plated product can be obtained.
【図１】本発明に係る連続焼鈍炉の全体を略示する縦断
面図。FIG. 1 is a longitudinal sectional view schematically showing an entire continuous annealing furnace according to the present invention.
【図２】図１と同じ連続焼鈍炉のリファイナを示す部分
拡大正面図。FIG. 2 is a partially enlarged front view showing a refiner of the same continuous annealing furnace as in FIG.
１１・・・予熱帯、１２・・・直接加熱帯、１３・・・
間接加熱帯、１４，１６・・・冷却帯、１５・・・保持
帯、２３・・・ポット、２４・・・メッキ浴、３２・・
・リファイナ、６１，６２・・・濾過器、７１・・・ク
ーラ、７２・・・吸引ファン、８１・・・脱酸素器、９
１，９２・・・除湿器11 ... pre-tropical, 12 ... direct heating zone, 13 ...
Indirect heating zone, 14, 16 ... cooling zone, 15 ... holding zone, 23 ... pot, 24 ... plating bath, 32 ...
・ Refiner, 61, 62 ・ ・ ・ Filter, 71 ・ ・ ・ Cooler, 72 ・ ・ ・ Suction fan, 81 ・ ・ ・ Deoxygenator, 9
1,92 ・ ・ ・ Dehumidifier
Claims (2)
リップの連続焼鈍炉において、間接加熱帯と保持帯、冷
却帯及び／又はダウンシュートとを連絡する配管途中に
リファイナが介装されており、該リファイナは濾過器、
クーラ、吸引ファン、脱酸素器及び除湿器を備えてい
て、該リファイナにより該間接加熱帯から吸引した汚染
雰囲気ガス中のメッキ浴成分、酸素及び水分を除去した
後の精製雰囲気ガスを保持帯、冷却帯及び／又はダウン
シュートへ戻すようにして成ることを特徴とする金属ス
トリップの連続焼鈍炉。In a continuous annealing furnace for a metal strip having a downstream side connected to a plating bath, a refiner is interposed in a pipe connecting an indirect heating zone and a holding zone, a cooling zone and / or a down chute. The refiner is a filter,
A cooler, a suction fan, a deoxygenator and a dehumidifier are provided, and the purifying atmosphere gas after removing the plating bath components, oxygen and moisture in the contaminated atmosphere gas sucked from the indirect heating zone by the refiner, A continuous annealing furnace for metal strip, wherein the furnace is configured to return to a cooling zone and / or a down chute.
請求項１記載の金属ストリップの連続焼鈍炉。2. The continuous annealing furnace for metal strip according to claim 1, wherein the plating bath component is zinc or a zinc alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35293396A JPH10176225A (en) | 1996-12-13 | 1996-12-13 | Continuous annealing furnace of metallic strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35293396A JPH10176225A (en) | 1996-12-13 | 1996-12-13 | Continuous annealing furnace of metallic strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10176225A true JPH10176225A (en) | 1998-06-30 |
Family
ID=18427450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35293396A Pending JPH10176225A (en) | 1996-12-13 | 1996-12-13 | Continuous annealing furnace of metallic strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10176225A (en) |
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- 1996-12-13 JP JP35293396A patent/JPH10176225A/en active Pending
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