JPH11302811A - Atmosphere gas controller in continuous galvanizing equipment - Google Patents
Atmosphere gas controller in continuous galvanizing equipmentInfo
- Publication number
- JPH11302811A JPH11302811A JP10790598A JP10790598A JPH11302811A JP H11302811 A JPH11302811 A JP H11302811A JP 10790598 A JP10790598 A JP 10790598A JP 10790598 A JP10790598 A JP 10790598A JP H11302811 A JPH11302811 A JP H11302811A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- snout
- steel strip
- atmosphere gas
- atmosphere
- 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.)
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- Coating With Molten Metal (AREA)
Abstract
(57)【要約】
【課題】 溶融亜鉛メッキ浴に鋼帯を浸漬して、連続的
に溶融亜鉛メッキ鋼板を製造する連続式溶融亜鉛メッキ
設備において、亜鉛蒸気を含むスナウト内の雰囲気を熱
処理炉側雰囲気と遮断し、亜鉛蒸気が鋼帯表面に付着し
て生じるメッキ後の製品外観不良やメッキ密着性不良を
防止する。
【解決手段】 連続式溶融亜鉛メッキラインにおいて、
熱処理炉出側とスナウトの間に鋼帯を挟んで両側に非接
触式ガス仕切装置を設け、該非接触ガス仕切装置部から
スナウト内の雰囲気ガスを抽気し、冷却して亜鉛を除去
した後再加熱してスナウト内へ噴射する。
(57) [Problem] To provide a continuous hot-dip galvanizing equipment for continuously manufacturing hot-dip galvanized steel sheets by immersing a steel strip in a hot-dip galvanizing bath, and to heat-treat a snout atmosphere containing zinc vapor in a snout. Shielding from the side atmosphere prevents zinc vapor from adhering to the surface of the steel strip and preventing defective product appearance and poor plating adhesion after plating. SOLUTION: In a continuous hot-dip galvanizing line,
A non-contact gas partitioning device is provided on both sides of the steel strip between the heat-treating furnace outlet side and the snout. Atmospheric gas in the snout is extracted from the non-contact gas partitioning device, cooled, zinc is removed, and then Heat and spray into the snout.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、連続亜鉛メッキ設
備の炉内雰囲気ガス制御装置に関するものであり、特に
溶融亜鉛浴から発生する亜鉛蒸気がスナウト内を通して
熱処理炉内側に拡散するのを防止するスナウト内の雰囲
気ガス仕切装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an atmosphere gas control device in a furnace of a continuous galvanizing equipment, and more particularly to a device for preventing zinc vapor generated from a molten zinc bath from diffusing inside a heat treatment furnace through a snout. The present invention relates to an atmosphere gas partition device in a snout.
【０００２】[0002]
【従来の技術】溶融亜鉛メッキ浴に鋼帯を浸漬して、連
続的に溶融亜鉛メッキ鋼帯を製造する連続亜鉛メッキ設
備において、鋼帯は、不活性ガス及び還元性ガスからな
る炉内雰囲気ガス中で熱処理され、続いて出側を溶融亜
鉛メッキ浴に浸漬されたスナウトと呼ばれる気密ダクト
内を通して浴内に導入され亜鉛メッキが施される。とこ
ろでスナウト内では、十分な還元性雰囲気が得られない
場合に金属灰などが生成し、また、溶融亜鉛浴からは亜
鉛が蒸発し、亜鉛蒸気となる。スナウト内で発生した亜
鉛蒸気は、熱処理炉内へ流れ込むとともに、スナウトを
通して溶融亜鉛浴に導入される鋼帯の表面に付着し、メ
ッキ後の製品に外観不良やメッキ密着性不良を生じるこ
とになる。2. Description of the Related Art In a continuous galvanizing apparatus for continuously producing a hot-dip galvanized steel strip by immersing the steel strip in a hot-dip galvanizing bath, the steel strip is heated in a furnace atmosphere comprising an inert gas and a reducing gas. Heat treatment is performed in a gas, and then the outlet side is introduced into the bath through an airtight duct called a snout immersed in a hot-dip galvanizing bath and galvanized. By the way, in a snout, when a sufficient reducing atmosphere cannot be obtained, metal ash or the like is generated, and zinc evaporates from a molten zinc bath to become zinc vapor. The zinc vapor generated in the snout flows into the heat treatment furnace and adheres to the surface of the steel strip introduced into the molten zinc bath through the snout, resulting in poor appearance and poor plating adhesion of the plated product. .
【０００３】この問題を解決するために、特開昭６２−
１７７１６４号公報に開示されているように、スナウト
の熱処理炉側に、スナウト内の雰囲気ガスを熱処理炉側
の雰囲気ガスと遮断する機械的雰囲気ガス遮断機構を設
け、この機械的雰囲気ガス遮断機構付近に、スナウト内
の雰囲気ガスと同種のガスで形成する遮断層を設ける技
術が開示されている。このとき、スナウト内の雰囲気ガ
スはスナウト下部から吸引され、雰囲気ガス中の亜鉛等
の金属を除去した後で加熱し、前記機械的雰囲気ガス遮
断機構付近の遮断層に供給するように構成されている。In order to solve this problem, Japanese Patent Application Laid-Open No.
As disclosed in Japanese Patent No. 177164, a mechanical atmosphere gas shutoff mechanism for shutting off the atmosphere gas in the snout from the atmosphere gas on the heat treatment furnace side is provided on the heat treatment furnace side of the snout. Discloses a technique of providing a barrier layer formed of a gas of the same type as an atmosphere gas in a snout. At this time, the atmosphere gas in the snout is sucked from the lower portion of the snout, heated after removing metals such as zinc in the atmosphere gas, and supplied to a blocking layer near the mechanical atmosphere gas blocking mechanism. I have.
【０００４】また、回収された雰囲気ガス中の亜鉛等の
金属の除去は、雰囲気ガスを金属の凝固温度状態にする
金属蒸気凝固室及び金属を除去した後で雰囲気ガスを所
定の温度まで加熱するガス加熱器を設けている。機械的
雰囲気ガス遮断機構は、鋼帯の片側にシールロールを配
設し、シールロールは、鋼帯及びスナウト内壁とわずか
な隙間を保つように設けられている。鋼帯のシールロー
ルと反対側には、進退自在なシール機構が設けられてお
り、鋼帯とシール機構は所定の隙間を開けて使用され
る。[0004] The removal of metals such as zinc in the recovered atmospheric gas is performed by heating the atmospheric gas to a predetermined temperature after removing the metal and a metal vapor coagulation chamber for setting the atmospheric gas to a solidifying temperature of the metal. A gas heater is provided. The mechanical atmosphere gas shutoff mechanism has a seal roll disposed on one side of the steel strip, and the seal roll is provided so as to keep a slight gap between the steel strip and the inner wall of the snout. On the opposite side of the steel strip from the seal roll, a seal mechanism that can move forward and backward is provided, and the steel strip and the seal mechanism are used with a predetermined gap.
【０００５】さらに、この機械的雰囲気ガス遮断機構を
一対として一定間隔をおいて２個設け、それらによって
形成される室に、所定の温度に加熱された雰囲気ガスを
供給して、スナウト及び熱処理炉より高い圧力の加圧室
を形成することにより雰囲気ガスの遮断を行おうとする
ものや、機械的雰囲気ガス遮断機構のスナウト側及び熱
処理炉側にガス噴射ノズルを設けて、所定の温度に加熱
した雰囲気ガスを該噴射ノズルより噴出することにより
ガスカーテンを形成し、スナウト内と熱処理炉内の雰囲
気ガスを遮断しようとしていた。Further, two mechanical atmosphere gas shut-off mechanisms are provided as a pair at regular intervals, and an atmosphere gas heated to a predetermined temperature is supplied to a chamber formed by the two mechanisms. A gas injection nozzle was provided on the snout side and the heat treatment furnace side of the mechanical atmosphere gas shut-off mechanism, and a gas injection nozzle was provided to form a pressurized chamber having a higher pressure, and heated to a predetermined temperature. A gas curtain is formed by ejecting the atmosphere gas from the injection nozzle, thereby trying to shut off the atmosphere gas in the snout and the heat treatment furnace.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、従来の
スナウトに設けた機械的雰囲気ガス遮断機構において
は、鋼帯と機械的雰囲気ガス遮断機構との摩擦に起因す
る鋼帯表面の傷の発生を防止するためには、鋼帯との間
に隙間を設けざるを得ず、例え、機械的雰囲気ガス遮断
機構を一対設け、それによって形成される空間に雰囲気
ガスを供給して圧力の高い加圧室を形成させる方法や、
ガス噴射ノズルを併設してガスカーテンを形成せしめる
方法を併用したとしても、鋼帯と機械的雰囲気ガス遮断
機構の間の隙間から亜鉛蒸気を含むスナウト内雰囲気ガ
スが熱処理炉側へ拡散することは避けられないという問
題があった。However, in the conventional mechanical atmosphere gas shutoff mechanism provided in the snout, the occurrence of scratches on the steel strip surface due to friction between the steel strip and the mechanical atmosphere gas shutoff mechanism is prevented. In order to do so, a gap must be provided between the steel strip and, for example, a pair of mechanical atmosphere gas shut-off mechanisms are provided, and an atmosphere gas is supplied to the space formed by the mechanism to provide a high-pressure pressurized chamber. How to form
Even if a method of forming a gas curtain with a gas injection nozzle is used in combination, the atmosphere gas in the snout containing zinc vapor diffuses from the gap between the steel strip and the mechanical atmosphere gas shutoff mechanism to the heat treatment furnace side. There was a problem that could not be avoided.
【０００７】従来の方法において、亜鉛蒸気の熱処理炉
側への拡散を防止する為には、大量の雰囲気ガスを供給
して、加圧室を形成せしめるか或いはガスカーテン効果
を得ることが必要になるが、その場合は、雰囲気ガスの
消費量が莫大なものになるという欠点があった。特に、
従来の方法ではガスカーテンを形成せしめるための雰囲
気ガスは、ガス噴射ノズルから単に噴射されるだけであ
るため、効果的なガスカーテン効果を得ることが困難で
あった。さらには、鋼帯を挟んで機械的雰囲気ガス遮断
機構と反対側には、シールロールが配設されており、シ
ールロールと鋼帯の間及びシールロールとスナウト内壁
の間には、同様に隙間を設けざるを得ず、この隙間から
亜鉛蒸気を含むスナウト内の雰囲気ガスが熱処理炉側へ
流出することは避けられないという致命的な欠点があっ
た。In the conventional method, in order to prevent the diffusion of zinc vapor to the heat treatment furnace, it is necessary to supply a large amount of atmospheric gas to form a pressurized chamber or to obtain a gas curtain effect. However, in this case, there is a disadvantage that the consumption of the atmosphere gas is enormous. Especially,
In the conventional method, the atmosphere gas for forming the gas curtain is simply injected from the gas injection nozzle, so that it has been difficult to obtain an effective gas curtain effect. Further, a seal roll is provided on the opposite side of the mechanical atmosphere gas shut-off mechanism with the steel strip therebetween, and a gap is similarly provided between the seal roll and the steel strip and between the seal roll and the inner wall of the snout. There is a fatal disadvantage that it is inevitable that atmospheric gas in the snout containing zinc vapor flows out to the heat treatment furnace through this gap.
【０００８】また、スナウト内の亜鉛蒸気を含む雰囲気
ガスは、スナウト下部より単に吸引されているだけであ
ったため、スナウト入側部に設けられた機械的雰囲気ガ
ス遮断機構の近傍に雰囲気ガスを供給して、スナウト入
側からスナウト下部に向かう雰囲気ガス流れを形成せし
めて、スナウト下部でスナウト内の雰囲気ガスを吸引し
たとしても、亜鉛メッキ浴面から発生する亜鉛蒸気を効
果的に捕修することは不可能であった。Further, since the atmosphere gas containing zinc vapor in the snout is merely sucked from the lower portion of the snout, the atmosphere gas is supplied to the vicinity of the mechanical atmosphere gas shut-off mechanism provided on the snout entrance side. Even if the atmosphere gas flow from the snout inlet side to the snout lower part is formed and the atmosphere gas in the snout is sucked at the lower part of the snout, the zinc vapor generated from the galvanizing bath surface is effectively captured. Was impossible.
【０００９】すなわち、前記スナウト入側部の機械的雰
囲気ガス遮断機構付近に供給した雰囲気ガス或いはスナ
ウト内へ別系統から供給された雰囲気ガスは、スナウト
下部に設けられた雰囲気ガス吸引部に向かって流れるこ
とにより、僅かながら亜鉛メッキ浴面から発生する亜鉛
蒸気の上昇を阻害する効果は期待できるものの、前記ス
ナウト下部に向かって流れる雰囲気ガスの流れが、スナ
ウト断面各部で一様にならない為、大部分の亜鉛蒸気が
機械的雰囲気ガス遮断機構に向かって上昇し、鋼帯と機
械的雰囲気ガス遮断機構の間の隙間或いは、鋼帯とシー
ルロールの間及びシールロールとスナウト内壁との間の
隙間を通過して、熱処理炉側へ流れてしまうという問題
があった。このとき、シールロール及びシールロールと
スナウト内壁部の比較的温度の低い箇所に亜鉛蒸気が凝
固堆積し、この堆積物が成長して鋼帯表面にスリ疵等の
欠陥を生じたり、鋼帯表面に付着してメッキ後の製品に
外観不良やメッキ密着性不良を生じることになってい
た。That is, the atmosphere gas supplied to the vicinity of the mechanical atmosphere gas shut-off mechanism on the snout entrance side or the atmosphere gas supplied from another system into the snout is directed toward the atmosphere gas suction section provided below the snout. Although the effect of inhibiting the rise of zinc vapor generated from the galvanizing bath surface can be expected slightly by flowing, the flow of the atmosphere gas flowing toward the lower part of the snout is not uniform at each part of the snout cross section, so that it is large. Part of the zinc vapor rises toward the mechanical atmosphere gas shutoff mechanism, and the gap between the steel strip and the mechanical atmosphere gas shutoff mechanism or the gap between the steel strip and the seal roll and between the seal roll and the inner wall of the snout. And flowed to the heat treatment furnace side. At this time, zinc vapor solidifies and deposits at relatively low temperature on the seal roll and the seal roll and the inner wall of the snout, and this deposit grows to generate defects such as scratches on the steel strip surface, , Resulting in poor appearance and poor plating adhesion of the plated product.
【００１０】運転時においては、鋼帯と機械的雰囲気ガ
ス遮断機構との間の隙間の量を管理することは極めて困
難であり、スナウトに覗き窓等を設けて該隙間を可視化
できるように工夫したとしても、スナウト内の亜鉛蒸気
により短期間で覗き窓ガラスの内面に曇りが生じてしま
うので、隙間の管理は、鋼帯にスリ疵等が生じないよう
に配慮して、小さく設定できないのが実状であった。こ
のことは、さらに従来の機械的雰囲気ガス遮断機構で
は、亜鉛蒸気を含む雰囲気ガスを熱処理炉側へ拡散しな
いようにしようとする所定の目的を達成することができ
ない理由とされていた。[0010] During operation, it is extremely difficult to control the amount of the gap between the steel strip and the mechanical atmosphere gas shut-off mechanism, so that a snout is provided with a viewing window or the like so that the gap can be visualized. Even if it does, fogging will occur on the inner surface of the sight glass in a short period of time due to the zinc vapor in the snout, so the gap management cannot be set small, taking into account that the steel strip does not have scratches etc. Was the actual situation. This is another reason that the conventional mechanical atmosphere gas shut-off mechanism cannot achieve a predetermined purpose of preventing the atmosphere gas containing zinc vapor from diffusing into the heat treatment furnace.
【００１１】亜鉛蒸気の発生を抑制する為に、また、亜
鉛密着性を向上する目的で、溶融亜鉛浴に侵入する鋼帯
の表面活性度をあげる為に、スナウト内の水素濃度を高
めようとすると、従来の方法では、スナウト内に導入し
た雰囲気ガスは容易に炉内側へ流れてしまう為、スナウ
ト部のみ雰囲気ガス中の水素濃度を上げることが容易で
なく、スナウト及び焼鈍炉内雰囲気ガス全体の水素濃度
を上げざるを得ず、水素原単位が高くなるという問題が
あった。[0011] In order to suppress the generation of zinc vapor and to increase the surface activity of the steel strip entering the molten zinc bath for the purpose of improving zinc adhesion, the concentration of hydrogen in the snout should be increased. Then, in the conventional method, the atmosphere gas introduced into the snout easily flows into the furnace, so that it is not easy to increase the hydrogen concentration in the atmosphere gas only in the snout part, and the entire atmosphere gas in the snout and the annealing furnace is not increased. However, there has been a problem that the hydrogen concentration must be increased, and the hydrogen unit consumption increases.
【００１２】[0012]
【課題を解決するための手段】本発明は、かかる従来の
問題を解決するために、 （１）連続亜鉛メッキ設備の熱処理炉出側のスナウト部
から、亜鉛蒸気を含む雰囲気ガスを系外へ吸引し、冷却
して亜鉛を除去した後、再加熱して再びスナウト内へ噴
射し、鋼帯に亜鉛蒸気が付着することを防止する如く形
成された連続亜鉛メッキ設備の炉内雰囲気ガス制御装置
において、ガス噴射ノズルとガス吸引ノズルより構成し
たガス仕切装置を、熱処理炉出側のスナウト部に、鋼帯
を挟んで両側に設け、該ガス仕切装置のガス吸引ノズル
からスナウト内雰囲気ガス或いは熱処理炉内雰囲気ガス
の一部を抽気するとともに、該抽気ガスを冷却して亜鉛
蒸気を除去し、さらに再加熱してスナウト内へ吹き込む
如くなした。SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides: (1) Atmospheric gas containing zinc vapor is sent out of a system from a snout portion on the exit side of a heat treatment furnace of a continuous galvanizing equipment. Suction, cooling and zinc removal, reheating and spraying again into the snout, atmosphere gas control device in furnace of continuous galvanizing equipment formed to prevent zinc vapor from adhering to steel strip In the above, a gas partition device composed of a gas injection nozzle and a gas suction nozzle is provided on both sides of a steel strip in a snout portion on the exit side of the heat treatment furnace, and the gas suction nozzle of the gas partition device is used to supply an atmosphere gas in the snout or heat treatment. A part of the atmosphere gas in the furnace was extracted, and the extracted gas was cooled to remove zinc vapor, then reheated and blown into the snout.
【００１３】（２）特にガス仕切装置は、ガス吸引ノズ
ルと該ガス吸引ノズルの両側に設けられたガス噴射ノズ
ルにより一体的に構成されていることを特徴とする。 （３）ガス仕切装置が設置されているスナウト部の、該
ガス仕切装置よりも下方の任意の位置に、雰囲気ガス供
給配管を接続し、熱処理炉内雰囲気ガス中の水素濃度よ
り高い水素濃度を有する雰囲気ガスをスナウト内へ吹き
込む如くなしたことを特徴とする。 （４）スナウト内部に鋼帯を挟んで両側に電気式ヒータ
ーを配設したことを特徴とする。 （５）スナウトの外周部に電気式ヒーターを配設し、該
電気式ヒーターとスナウトを同時に保温材で覆う如くな
したことを特徴とする。(2) In particular, the gas partitioning device is characterized by being integrally formed by a gas suction nozzle and gas injection nozzles provided on both sides of the gas suction nozzle. (3) Atmosphere gas supply piping is connected to an arbitrary position of the snout portion where the gas partition device is installed below the gas partition device, and a hydrogen concentration higher than the hydrogen concentration in the atmosphere gas in the heat treatment furnace is adjusted. It is characterized in that the atmosphere gas is blown into the snout. (4) An electric heater is disposed on both sides of a steel strip with a steel strip interposed therebetween. (5) An electric heater is provided on the outer periphery of the snout, and the electric heater and the snout are simultaneously covered with a heat insulating material.
【００１４】[0014]
【実施例】本発明を図１に示す実施例をもって説明す
る。鋼帯１は、熱処理炉２において熱処理された後、タ
ーンダウンロール３を介しスナウト６を経て、溶融亜鉛
メッキ浴４に導入される。さらに、シンクロール５を経
て、コーティングノズル（図示していない）により所定
のメッキ厚さに調整され亜鉛メッキされる。熱処理炉２
とスナウト６の間には、ガス仕切装置１２が設けられて
いる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in FIG. After the steel strip 1 is heat-treated in the heat treatment furnace 2, it is introduced into the hot-dip galvanizing bath 4 through the snout 6 via the turndown roll 3. Further, through a sink roll 5, the coating is adjusted to a predetermined plating thickness by a coating nozzle (not shown), and zinc plating is performed. Heat treatment furnace 2
A gas partitioning device 12 is provided between the snout 6 and the snout 6.
【００１５】図２にガス仕切装置１２の詳細を示す。ガ
ス仕切装置１２は、ガス噴射ノズル１３、１３ａ、１３
ｂ及び１３ｃとガス吸引ノズル１４及び１４ａによって
構成されている。すなわち本実施例では、中央にガス吸
引ノズル１４、１４ａを設けるとともに、その両側にそ
れぞれガス噴射ノズル１３及び１３ａ、１３ｂ及び１３
ｃを設けた一体的な構成となっている。ガス吸引ノズル
１４及び１４ａからは、亜鉛蒸気を含むスナウト内雰囲
気ガス或いは熱処理炉２内の雰囲気ガスの一部が吸引さ
れる。FIG. 2 shows the details of the gas partitioning device 12. The gas partitioning device 12 includes gas injection nozzles 13, 13a, 13
b and 13c and gas suction nozzles 14 and 14a. That is, in this embodiment, the gas suction nozzles 14 and 14a are provided at the center, and the gas injection nozzles 13 and 13a, 13b and 13
c is provided as an integrated structure. From the gas suction nozzles 14 and 14a, a part of the atmosphere gas in the snout or the atmosphere gas in the heat treatment furnace 2 containing zinc vapor is sucked.
【００１６】吸引された雰囲気ガスは、引き続いて、図
１に示す冷却器８によって亜鉛蒸気が凝縮回収されスカ
ム回収箱９に集められる。亜鉛を除去された雰囲気ガス
は、回収ブロワー７によって吸引、昇圧され、ヒーター
１０により加熱された後再びガス仕切装置１２のガス噴
射ノズル１３、１３ａ、１３ｂ及び１３ｃに供給され
る。ガス噴射ノズル１３、１３ａ、１３ｂ及び１３ｃの
それぞれに供給される雰囲気ガス量は、スナウト６内圧
力、熱処理炉２内圧力に応じて、バルブ或いはダンパー
等の風量調整機構により最適量に調整され、亜鉛蒸気を
確実に回収できるようにされている。The sucked atmospheric gas is then condensed and recovered by a cooler 8 shown in FIG. 1 and collected in a scum recovery box 9. The atmosphere gas from which zinc has been removed is suctioned and pressurized by the recovery blower 7, heated by the heater 10, and then supplied again to the gas injection nozzles 13, 13a, 13b, and 13c of the gas partition device 12. The amount of the atmosphere gas supplied to each of the gas injection nozzles 13, 13a, 13b, and 13c is adjusted to an optimum amount by an air volume adjusting mechanism such as a valve or a damper according to the internal pressure of the snout 6 and the internal pressure of the heat treatment furnace 2, Zinc vapor can be reliably recovered.
【００１７】このように、本実施例におけるガス仕切装
置１２は、中央に吸引ノズル１４及び１４ａがあって、
その両側にガス噴射ノズル１３及び１３ａまたは１３ｂ
及び１３ｃを設けており、このガス噴射ノズル１３及び
１３ａまたは１３ｂ及び１３ｃから噴射されるシールガ
スによって囲まれる領域に静圧領域を形成する様に配慮
されており、この静圧領域からシールガスの一部を外部
に抽気するので、従来のような機械的雰囲気ガス遮断機
構に比べ、シール性がよく、特にスナウト６側の圧力変
動に対して有利になる。As described above, the gas partitioning device 12 in this embodiment has the suction nozzles 14 and 14a at the center,
Gas injection nozzles 13 and 13a or 13b on both sides
And 13c are provided so that a static pressure region is formed in a region surrounded by the seal gas injected from the gas injection nozzles 13 and 13a or 13b and 13c. Since a part of the air is bled to the outside, the sealing performance is better than that of a conventional mechanical atmosphere gas shut-off mechanism, and it is particularly advantageous against pressure fluctuation on the snout 6 side.
【００１８】また、ガス噴射ノズル１３及び１３ａまた
は１３ｂ及び１３ｃは鋼帯に対して３０〜６０度の角度
を持たせるのがシールをする上で効果的である。これ
は、ガス噴射ノズル角度が鋼帯に対して３０度未満であ
ると、鋼帯表面に沿って上昇する亜鉛蒸気を含むスナウ
ト内雰囲気ガスの流れを効果的に遮断できなくなるし、
６０度を超えるとガス噴射ノズル１３から噴射されるシ
ールガスによって形成される静圧発生効率が悪くなるた
めである。It is effective to make the gas injection nozzles 13 and 13a or 13b and 13c have an angle of 30 to 60 degrees with respect to the steel strip in sealing. This means that if the gas injection nozzle angle is less than 30 degrees with respect to the steel strip, the flow of the atmosphere gas in the snout containing zinc vapor rising along the steel strip surface cannot be effectively blocked,
If it exceeds 60 degrees, the efficiency of generating a static pressure formed by the seal gas injected from the gas injection nozzle 13 is deteriorated.
【００１９】図２に示すガス仕切装置１２は、ガス噴射
ノズル１３及び１３ａとガス吸引ノズル１４によって、
さらに、ガス噴射ノズル１３ｂ及び１３ｃとガス吸引ノ
ズル１４ａによって、一体的に構成されている一実施例
を示すが、ガス噴射ノズルとガス吸引ノズルは、それぞ
れ独立して、互いに接近させて構成しても良い。スナウ
ト６には、焼鈍炉内の雰囲気ガスに比べて、水素濃度の
高い、例えば、７５〜１００％水素濃度の雰囲気ガスを
供給する雰囲気ガス供給配管１５が、ガス仕切装置１２
よりも下方の任意の位置に接続されている。この雰囲気
ガス供給配管の経路には、雰囲気ガスを予熱するガス予
熱器１６が設けられている。The gas partitioning device 12 shown in FIG. 2 is operated by gas injection nozzles 13 and 13a and a gas suction nozzle 14.
Further, an embodiment in which the gas injection nozzles 13b and 13c and the gas suction nozzle 14a are integrally formed is shown. However, the gas injection nozzle and the gas suction nozzle are formed independently and close to each other. Is also good. An atmosphere gas supply pipe 15 for supplying an atmosphere gas having a higher hydrogen concentration, for example, a hydrogen concentration of 75 to 100% than the atmosphere gas in the annealing furnace, is provided in the snout 6.
It is connected to an arbitrary position below. A gas preheater 16 for preheating the atmosphere gas is provided in the path of the atmosphere gas supply pipe.
【００２０】このように、熱処理炉２内の雰囲気ガス中
の水素濃度を変えることなく、スナウト６内に高濃度水
素を導入することにより、溶融亜鉛浴に侵入する鋼帯１
の表面活性度をあげることができ、亜鉛密着性を向上す
ることができる。またスナウト６内に独立した形で水素
を導入することができるので、従来に比べ水素原単位が
小さくてすむ。As described above, by introducing high-concentration hydrogen into the snout 6 without changing the hydrogen concentration in the atmospheric gas in the heat treatment furnace 2, the steel strip 1 entering the molten zinc bath can be introduced.
Can increase the surface activity, and can improve the zinc adhesion. Further, since hydrogen can be introduced into the snout 6 in an independent manner, the unit hydrogen consumption can be smaller than in the conventional case.
【００２１】さらに、スナウト内部には、鋼帯を挟んで
両側に電気式ヒーター１７が配設されており、スナウト
内部に亜鉛蒸気が凝縮して堆積するのを防止している。
また、図示されていないが、電気式ヒーターをスナウト
の外側に設け、断熱材によってスナウトごと覆うことに
よって、同様にスナウト内面に亜鉛蒸気が凝縮して堆積
するのを防止するようにしてもよい。Further, electric heaters 17 are disposed on both sides of the steel strip with the steel strip interposed therebetween, thereby preventing zinc vapor from condensing and accumulating inside the snout.
Although not shown, an electric heater may be provided outside the snout and covered with the heat insulating material together with the snout, thereby similarly preventing the condensation and accumulation of zinc vapor on the inner surface of the snout.
【００２２】[0022]
【発明の効果】溶融亜鉛浴から発生する蒸気は、本願の
構成によるガス仕切装置により完全に遮断され、かつ、
雰囲気回収配管及び冷却器により除去されるため、熱処
理炉内へ拡散することを完全に防止することができる。
また、回収された雰囲気ガスは、回収ブロワー及びヒー
ターにより再生利用されスナウト内に再循環されるた
め、雰囲気ガス原単位を悪化させるおそれがない。The steam generated from the molten zinc bath is completely shut off by the gas partition device according to the present invention, and
Since it is removed by the atmosphere recovery pipe and the cooler, it can be completely prevented from diffusing into the heat treatment furnace.
Further, the recovered atmospheric gas is recycled by the recovery blower and the heater and is recirculated into the snout, so that there is no possibility that the atmospheric gas intensity decreases.
【００２３】本発明における仕切装置は、走行する鋼帯
と非接触にスナウト内の雰囲気ガスを熱処理炉側の雰囲
気ガスと完全遮断することができるため、従来の機械的
雰囲気ガス遮断機構のように鋼帯との隙間を厳しく管理
する必要がなく、また、従来技術における加圧室やガス
カーテンを形成せしめるための雰囲気ガスを多量に使用
しなくて済む。しかも、水素濃度の高い雰囲気ガスはス
ナウト部においてガス仕切装置の下方よりスナウト内に
吹き込まれるため、スナウト内の亜鉛浴面とガス仕切装
置の間を均一な水素濃度の雰囲気ガスとすることができ
る。The partitioning device according to the present invention can completely shut off the atmosphere gas in the snout from the atmosphere gas on the heat treatment furnace side without contacting the running steel strip, and therefore, as in the conventional mechanical atmosphere gas shutoff mechanism. It is not necessary to strictly control the gap with the steel strip, and it is not necessary to use a large amount of atmosphere gas for forming a pressurized chamber or a gas curtain in the conventional technology. Moreover, since the atmosphere gas having a high hydrogen concentration is blown into the snout from below the gas partition device in the snout portion, the atmosphere gas having a uniform hydrogen concentration can be provided between the zinc bath surface in the snout and the gas partition device. .
【００２４】さらに、亜鉛密着性を向上する目的で、溶
融亜鉛浴に侵入する鋼帯の表面活性度をあげる目的でス
ナウト内の水素濃度を高めようとする場合には、熱処理
炉内の雰囲気ガス中の水素濃度を変えることなくスナウ
ト内の水素濃度のみを容易に高めることができるため、
水素原単位が小さくて済む。さらに、スナウト内部に、
鋼帯を挟んで両側に電気式ヒーターを設け、または電気
式ヒーターをスナウトの外側に設け、断熱材によってス
ナウトごと覆うことによって、スナウト内部に亜鉛蒸気
が凝縮して堆積するのを防止することができる。Further, when the hydrogen concentration in the snout is to be increased in order to increase the surface activity of the steel strip entering the molten zinc bath for the purpose of improving the zinc adhesion, the atmosphere gas in the heat treatment furnace is required. Since it is possible to easily increase only the hydrogen concentration in the snout without changing the hydrogen concentration in the inside,
The unit hydrogen consumption can be small. In addition, inside the snout,
An electric heater is provided on both sides of the steel strip, or an electric heater is provided outside the snout, and the snout is covered with heat insulating material to prevent condensation and accumulation of zinc vapor inside the snout. it can.
【図１】本発明の連続式溶融亜鉛メッキラインにおける
炉内雰囲気制御方法の一例を示す説明図である。FIG. 1 is an explanatory diagram showing an example of a furnace atmosphere control method in a continuous galvanizing line of the present invention.
【図２】本発明における非接触式ガス仕切装置の一例を
示す断面図である。FIG. 2 is a cross-sectional view illustrating an example of a non-contact gas partition device according to the present invention.
１ 鋼帯 ２ 熱処理炉 ３ ターンダウンロール ４ 溶融亜鉛メッキ浴 ５ シンクロール ６ スナウト ７ 回収ブロワー ８ 冷却器 ９ スカム回収箱 １０ ヒーター １１ 雰囲気ガス回収配管 １２ ガス仕切装置 １３，１３ａ、１３ｂ，１３ｃ ガス噴射ノズル １４，１４ａ ガス吸引ノズル １５ 雰囲気ガス供給管 １６ ガス予熱器 １７ 電気式ヒーター DESCRIPTION OF SYMBOLS 1 Steel strip 2 Heat treatment furnace 3 Turndown roll 4 Hot-dip galvanizing bath 5 Sink roll 6 Snout 7 Recovery blower 8 Cooler 9 Scum recovery box 10 Heater 11 Atmospheric gas recovery pipe 12 Gas partition device 13, 13a, 13b, 13c Gas injection Nozzle 14, 14a Gas suction nozzle 15 Atmospheric gas supply pipe 16 Gas preheater 17 Electric heater
Claims (5)
ナウト部から、亜鉛蒸気を含む雰囲気ガスを系外へ吸引
し、冷却して亜鉛を除去した後、再加熱して再びスナウ
ト内へ噴射し、鋼帯に亜鉛蒸気が付着することを防止す
る如く形成された連続亜鉛メッキ設備の炉内雰囲気ガス
制御装置において、ガス噴射ノズルとガス吸引ノズルに
より構成したガス仕切装置を、熱処理炉出側のスナウト
部に、鋼帯を挟んで両側に設け、該ガス仕切装置のガス
吸引ノズルからスナウト内雰囲気ガス或いは熱処理炉内
雰囲気ガスの一部を抽気するとともに、該抽気ガスを冷
却して亜鉛蒸気を除去し、さらに再加熱してスナウト内
へ吹き込む如くなしたことを特徴とする連続亜鉛メッキ
設備の炉内雰囲気ガス制御装置。1. Atmospheric gas containing zinc vapor is sucked out of the system from the snout part on the exit side of the heat treatment furnace of the continuous galvanizing equipment, cooled, zinc is removed, reheated, and injected again into the snout. Then, in the furnace atmosphere gas control device of the continuous galvanizing equipment formed so as to prevent zinc vapor from adhering to the steel strip, the gas partition device composed of the gas injection nozzle and the gas suction nozzle is connected to the heat treatment furnace outlet side. In the snout part, a steel strip is provided on both sides of the steel strip. A part of the snout atmosphere gas or the heat treatment furnace atmosphere gas is extracted from the gas suction nozzle of the gas partitioning device, and the extracted gas is cooled to obtain a zinc vapor. An atmosphere gas control device in a furnace of a continuous galvanizing equipment, wherein the gas is removed and further reheated and blown into a snout.
該ガス吸引ノズルの両側に設けられたガス噴射ノズルに
より一体的に構成されていることを特徴とする請求項１
記載の連続亜鉛メッキ設備の炉内雰囲気ガス制御装置。2. The gas partition device according to claim 1, wherein the gas suction nozzle is integrally formed with a gas suction nozzle and gas injection nozzles provided on both sides of the gas suction nozzle.
An atmosphere gas control device in a furnace of the continuous galvanizing equipment described in the above.
ウト部の、該ガス仕切装置よりも下方の任意の位置に、
雰囲気ガス供給配管を接続し、熱処理炉内雰囲気ガス中
の水素濃度より高い水素濃度を有する雰囲気ガスをスナ
ウト内へ吹き込む如くなしたことを特徴とする請求項１
または２記載の連続亜鉛メッキ設備の雰囲気ガス制御装
置。3. A snout portion in which the gas partition device is installed, at an arbitrary position below the gas partition device,
An atmosphere gas supply pipe is connected, and an atmosphere gas having a hydrogen concentration higher than the hydrogen concentration in the atmosphere gas in the heat treatment furnace is blown into the snout.
Or the atmospheric gas control apparatus of the continuous galvanizing equipment of 2.
式ヒーターを配設したことを特徴とする請求項１〜３記
載の連続亜鉛メッキ設備の雰囲気ガス制御装置。4. An atmosphere gas control apparatus for a continuous galvanizing facility according to claim 1, wherein electric heaters are disposed on both sides of the steel strip with the steel strip interposed therebetween.
設し、該電気式ヒーターとスナウトを同時に保温材で覆
う如くなしたことを特徴とする請求項１〜３記載の連続
亜鉛メッキ設備の雰囲気ガス制御装置。5. The continuous galvanizing equipment according to claim 1, wherein an electric heater is arranged on an outer peripheral portion of the snout, and the electric heater and the snout are simultaneously covered with a heat insulating material. Atmospheric gas control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10790598A JPH11302811A (en) | 1998-04-17 | 1998-04-17 | Atmosphere gas controller in continuous galvanizing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10790598A JPH11302811A (en) | 1998-04-17 | 1998-04-17 | Atmosphere gas controller in continuous galvanizing equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11302811A true JPH11302811A (en) | 1999-11-02 |
Family
ID=14471048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10790598A Withdrawn JPH11302811A (en) | 1998-04-17 | 1998-04-17 | Atmosphere gas controller in continuous galvanizing equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11302811A (en) |
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| KR20020041597A (en) * | 2000-11-28 | 2002-06-03 | 이구택 | apparatus for preventing atmosphere inlet and cooling zinc on the surface of strip |
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