JPH0234727A - Method and device for cooling metallic strip - Google Patents
Method and device for cooling metallic stripInfo
- Publication number
- JPH0234727A JPH0234727A JP18175588A JP18175588A JPH0234727A JP H0234727 A JPH0234727 A JP H0234727A JP 18175588 A JP18175588 A JP 18175588A JP 18175588 A JP18175588 A JP 18175588A JP H0234727 A JPH0234727 A JP H0234727A
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- coolant
- tank
- liquid
- temperature
- 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
- 238000001816 cooling Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000000137 annealing Methods 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims description 40
- 239000000110 cooling liquid Substances 0.000 claims description 18
- 239000002826 coolant Substances 0.000 abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 20
- 239000000498 cooling water Substances 0.000 abstract description 6
- AFYPFACVUDMOHA-UHFFFAOYSA-N chlorotrifluoromethane Chemical compound FC(F)(F)Cl AFYPFACVUDMOHA-UHFFFAOYSA-N 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 28
- 238000007654 immersion Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 239000012809 cooling fluid Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Control Of Heat Treatment Processes (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野１
本発明は、金属ストリップの連続焼鈍炉における金属ス
トリップの冷却装置および冷却方法に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a cooling device and method for a metal strip in a continuous annealing furnace for metal strip.
［従来の技術１
金属ストリップの連続焼鈍炉において、金属ストリップ
を冷却する方法には、
（１） 低温ガスを金属ストリップに吹き付けるガス
ジェット冷却
（２クーリングチューブあるいは水冷チャンバによる放
射冷却
■ 冷却されたロールに金属ストリップを巻きかけるこ
とによって冷却するロール冷却（２）冷却液を直接金属
ストリップに吹き付けるスプレィ冷却気水冷却
■ 冷却液に金属ストリップを浸漬させる浸漬冷却
がある。[Prior art 1] Methods for cooling a metal strip in a continuous annealing furnace for metal strips include: (1) Gas jet cooling in which low-temperature gas is blown onto the metal strip (2) Radiant cooling using a cooling tube or water-cooling chamber■ Cooled roll (2) Spray cooling, in which the cooling liquid is sprayed directly onto the metal strip; Air-water cooling; ■ Immersion cooling, in which the metal strip is immersed in the cooling liquid.
本発明はこれらのうち浸漬冷却に関するもので、浸漬冷
却は主に連続焼鈍炉における最終冷却装置として用いら
れており、通常金属ストリップの温度を２００〜３００
℃から室温近＜（１００°Ｃ以下）まで冷却している。The present invention relates to immersion cooling, which is mainly used as a final cooling device in continuous annealing furnaces, and usually reduces the temperature of the metal strip to 200 to 300
It is cooled from ℃ to near room temperature (below 100 ℃).
この時、冷却金属ストリップの温度の制御は冷却槽の液
温の制御によってなされている。これはすなわち浸漬冷
却時の熱伝達係数が１０００〜４０００ｋｃａ ｌ／ゴ
・ｌ〕・℃と大き（、また液中でノズルから冷却液を金
属ストリップに向けて噴出することにより熱伝達係数は
５０００〜ｌ ００００ｋｃａ ｌ／ｒｎ”−ｈ・℃と
さらに大きくすることができるため、金属ストリップの
浸漬長を十分にとれば、金属ストリップの温度は冷却槽
の液温にほぼ等しくなるからである、
この冷却槽の液温をコントロールする方法として大別し
て１次のａ）、ｂ）の２つの方法が行われている。At this time, the temperature of the cooling metal strip is controlled by controlling the temperature of the liquid in the cooling tank. This means that the heat transfer coefficient during immersion cooling is as large as 1,000 to 4,000 kcal/g·l]・℃ (and that the heat transfer coefficient is as large as 5,000 to 4,000 kcal/go·l) by jetting the cooling liquid toward the metal strip from a nozzle in the liquid. The temperature of the metal strip will be approximately equal to the temperature of the liquid in the cooling tank if the immersion length of the metal strip is long enough. There are two main methods used to control the temperature of the liquid in the tank: primary methods a) and b).
ａ）冷却液の注水側＠（第４図）
冷却槽２内の冷却液温を制御するためにポンプ６で低温
の冷却液３を補給する。液温計４の測定値により補給液
制御弁６を操作する。a) Coolant injection side @ (Fig. 4) In order to control the temperature of the coolant in the cooling tank 2, the pump 6 supplies low-temperature coolant 3. The replenishment liquid control valve 6 is operated based on the measured value of the liquid thermometer 4.
この時補給冷却液３は金属ストリップ１を冷却し液温を
所定の温度に制御するために多量に消費され、オーバー
フロー液１５として排出される（特公昭５７−１１９３
１）。At this time, a large amount of the replenishing cooling liquid 3 is consumed in order to cool the metal strip 1 and control the liquid temperature to a predetermined temperature, and is discharged as an overflow liquid 15 (Japanese Patent Publication No. 57-1193
1).
ｂ）冷却液循環方式（第５図）
冷却槽２内の冷却液を、循環ポンプ９を用いて循環させ
、循環系に設置した循環液冷却器１０によって冷媒１１
を用いて冷却液を冷却する。冷却槽２内の液温は制御弁
８により循環量を調節することで所定の温度に制御され
る。この時、補給冷却液３は金属ストリップが持ち出す
液量および蒸発量に応じた液量を補給すれば良い（特公
昭５７−５６５３２）。b) Coolant circulation method (Fig. 5) The coolant in the cooling tank 2 is circulated using the circulation pump 9, and the coolant 11 is circulated by the circulating liquid cooler 10 installed in the circulation system.
Cool the coolant using The temperature of the liquid in the cooling tank 2 is controlled to a predetermined temperature by adjusting the circulation amount by the control valve 8. At this time, the replenishment cooling liquid 3 may be replenished in an amount corresponding to the amount of liquid carried out by the metal strip and the amount of evaporation (Japanese Patent Publication No. 57-56532).
冷却液は金属ストリップと直接接触するため、金属スト
リップ表面性状をきれいに保つために、純水などきれい
な水が使用されており、またスキンバス前で最終冷却が
行われる場合、冷却液として調質圧延液が用いられるこ
ともある（特公昭５８−６７６６）。Since the cooling fluid comes into direct contact with the metal strip, clean water such as pure water is used to keep the surface quality of the metal strip clean, and when final cooling is performed before the skin bath, temper rolling is used as the cooling fluid. Sometimes a liquid is used (Japanese Patent Publication No. 58-6766).
［発明が解決しようとする課題］
このような高価な冷却液を使用するに当り、上記ａ）方
式では多量の冷却液を排出しており、製造コスト面で不
利である。また上記ｂ）方式では冷却液の消費量を大幅
に低減することができるが、冷却液を多量に循環する必
要があり、液循環に要するポンプ動力が大きくなる。[Problems to be Solved by the Invention] When using such an expensive coolant, method a) above discharges a large amount of coolant, which is disadvantageous in terms of manufacturing costs. Furthermore, although the above method b) can significantly reduce the amount of cooling liquid consumed, it is necessary to circulate a large amount of the cooling liquid, and the pump power required for liquid circulation increases.
本発明はこれらの冷却液消費量およびポンプ電力を低減
し、安定した板温制御を行う冷却装置および冷却方法を
提供することを目的とする。It is an object of the present invention to provide a cooling device and a cooling method that reduce the amount of coolant consumed and pump power, and perform stable plate temperature control.
［課題を解決するための手段］
本発明は金属ストリップの熱処理を行う連続焼鈍炉にお
いて、金属ストリップを冷却液に浸漬冷却を行う冷却槽
内に冷却液を冷却する熱交換器を設け、冷却槽を１段あ
るいはＰＲ数段設けたことを特徴とする金属ストリップ
の冷却装置であり、冷却槽内に冷却器を設置し、冷却器
を通過する冷媒】により槽内の液温を金属ストリップの
冷却目標から定まる温度に制御するものである。[Means for Solving the Problems] The present invention provides a continuous annealing furnace for heat-treating metal strips, in which a heat exchanger for cooling the cooling liquid is installed in a cooling tank for cooling the metal strip by immersing it in the cooling liquid. This is a metal strip cooling device characterized by having one stage or several stages of PR.A cooler is installed in the cooling tank, and the temperature of the liquid in the tank is changed by cooling the metal strip by refrigerant passing through the cooler. The temperature is controlled to a target value.
［作用Ｊ 第１図に本発明による冷却装置の一例を示す。[Action J FIG. 1 shows an example of a cooling device according to the present invention.
冷却槽２内の冷却液温を所定の温度に制御卸するために
、冷却液中に冷却器１２が設置されている。A cooler 12 is installed in the cooling liquid in order to control the temperature of the cooling liquid in the cooling tank 2 to a predetermined temperature.
冷却液は冷却槽２内で自然対流および金属ストリップｌ
が液中を移動する際に生じる同伴力（弓きずり力）によ
って撹拌され、冷却液２中に設置された冷却器１２によ
り冷却される。The cooling liquid flows through natural convection and metal strips in the cooling tank 2.
The liquid is stirred by the entrained force (bow force) generated when it moves through the liquid, and is cooled by the cooler 12 installed in the cooling liquid 2.
槽内の液温度は冷却器中を流れる冷媒１３の流１を制御
弁１４により調節することによって所定の温度に制御さ
れる。The temperature of the liquid in the tank is controlled to a predetermined temperature by regulating the flow 1 of refrigerant 13 flowing through the cooler using a control valve 14.
すなわち金属ストリップｌが冷却される際に生じる冷却
液温の上昇を金属ストリップの通過時に生じる冷却液の
撹拌力を利用して冷却器１２によって冷却するものであ
り、本方法を用いれば従来必要であった多量の冷却液の
消費を避け、一方冷却液の循環に要するポンプ動力を低
減することができる。That is, the increase in temperature of the coolant that occurs when the metal strip l is cooled is cooled by the cooler 12 by using the stirring force of the coolant that occurs when the metal strip passes through the metal strip, which is not necessary in the past. It is possible to avoid consumption of a large amount of cooling liquid, while reducing the pump power required for circulation of the cooling liquid.
伶延鋼板の連続焼鈍炉において本発明の冷却装置を適用
した例を以下に述べる。An example in which the cooling device of the present invention is applied to a continuous annealing furnace for rolled steel sheets will be described below.
第６図に連続焼鈍炉の概要を示す、金属ストリップｌは
加熱帯１６の入側から加熱帯に入り、ここで７００℃〜
８００℃まで加熱され、均熱帯１７にて均熱処理される
。その後、冷却帯１８゜１９において２５０〜３００℃
まで冷却された金属ストリップ１は最終冷却帯２０にお
いて、室温まで浸漬冷却される。この最終冷却帯２０に
本発明の冷却装置を適用した。FIG. 6 shows an outline of a continuous annealing furnace. The metal strip l enters the heating zone from the entrance side of the heating zone 16, and is heated to a temperature of 700°C to
It is heated to 800° C. and subjected to soaking treatment in a soaking zone 17. After that, in the cooling zone 18°19, the temperature is 250-300°C.
The metal strip 1 that has been cooled to a temperature of 100 nm is immersed in a final cooling zone 20 to be cooled to room temperature. The cooling device of the present invention was applied to this final cooling zone 20.
この冷却装置は第１図に示した冷却装置と同型である６
以下第１図を用いて詳細に説明する。冷却液には純水を
用いており、補給水３は５ｒｎ’／ｈを常時流している
。これは冷却液の液面を一定にするためであり、金属ス
トリップが持ち出す液量および蒸発による消費量を補い
、余りはオーバーフロー水１５として槽外へ排出される
。槽２内の液温は５５℃に制御されており、液温を制御
するための冷却器１２が槽内に設置されている。今回用
いた冷却器は工場の循環水を冷媒１３として用い、フィ
ン付チューブをｌＪ２内に配置した。This cooling device is of the same type as the cooling device shown in Figure 16.
This will be explained in detail below using FIG. Pure water is used as the coolant, and makeup water 3 is constantly flowing at a rate of 5 rn'/h. This is to keep the level of the coolant constant, and compensates for the amount of liquid carried out by the metal strip and the amount consumed by evaporation, and the remainder is discharged as overflow water 15 to the outside of the tank. The liquid temperature in the tank 2 is controlled at 55° C., and a cooler 12 for controlling the liquid temperature is installed in the tank. The cooler used this time used circulating water from the factory as the refrigerant 13, and a finned tube was placed inside lJ2.
本発明の効果を定量的に把握するために本冷却装置を用
いて従来方式との比較テストを行った。第１表にテスト
結果を示す。In order to quantitatively understand the effects of the present invention, a comparison test with a conventional system was conducted using this cooling device. Table 1 shows the test results.
テスト条件としては、厚さ０．２７ ｍ ｍ Ｘ幅９３
０ｍｍの金属ストリップを５００ｍｐｍで通板した。最
終冷却帯入口板温は２５０°Ｃであり、出口では７０℃
まで冷却されていた。The test conditions were: thickness 0.27 mm x width 93 mm
A 0 mm metal strip was passed through at 500 mpm. The final cooling zone inlet plate temperature is 250°C, and the outlet temperature is 70°C.
It had been cooled down to.
従来のａ）方式、すなわち補給水による液温制御を行っ
た場合、液温を５５℃に制御し、出口の金属ストリップ
の温度を７０℃とするために、１０ｒｒ？／ｈもの純水
を補給し、殆ど全量をオーバーフロー水として排出した
。When using the conventional method a), that is, controlling the liquid temperature using make-up water, in order to control the liquid temperature to 55°C and the temperature of the metal strip at the outlet to 70°C, 10rr? /h of pure water was replenished, and almost the entire amount was discharged as overflow water.
また従来のｂ）方式、すなわち循環方式を行った場合、
補給水は５ｒＩｉ′／ｈと大幅に低減することができた
が、純水を循環するためにポンプ電力を２０ｋＷ必要と
した。In addition, when using the conventional b) method, that is, the circulation method,
Although the amount of make-up water could be significantly reduced to 5 rIi'/h, a pump power of 20 kW was required to circulate the pure water.
これに対し本発明方法を実施したところ、補給水は従来
のｂ）方式と同様５ｒｒ？／ｈと少なく、槽内に設置し
た冷却器によって液温を５５℃、出口金属ストリップの
温度を７０℃に制御することができた。On the other hand, when the method of the present invention was implemented, the make-up water was 5rr, same as the conventional b) method. /h, and the liquid temperature could be controlled to 55°C and the temperature of the outlet metal strip to 70°C using a cooler installed in the tank.
なお、冷却水槽が１槽で、かつ、連続焼鈍炉出側にスキ
ンバスが設置されている第１図の場合、冷却水槽出口の
金属ストリ・ンブの温度は５０℃以下が良いとされてい
るが、冷却水槽が１槽のみでは金属ストリップのサイズ
変化、ラインスピード変化に対して、出口金属ストリッ
プの温度を５０℃に制御できない場合がある。このよう
な場合、冷却水槽を複数槽設けて、段階的に板温を下げ
る方式を用いるとよい。第２図には２槽タイプの冷却装
置に本発明を適応した例を示した。この場合、各々の冷
却水槽２，２ａのレベルを保つために、各々５ＩＴ？／
ｈずつ、合計１０ｒｎ’／ｈの補給水３を必要とする。In addition, in the case of Figure 1 where there is only one cooling water tank and a skin bath is installed on the exit side of the continuous annealing furnace, it is said that the temperature of the metal strip at the exit of the cooling water tank is preferably 50°C or less. However, if there is only one cooling water tank, it may not be possible to control the temperature of the outlet metal strip to 50° C. in response to changes in the size of the metal strip and changes in line speed. In such a case, it is advisable to use a method in which a plurality of cooling water tanks are provided and the plate temperature is lowered in stages. FIG. 2 shows an example in which the present invention is applied to a two-tank type cooling device. In this case, in order to maintain the level of each cooling water tank 2, 2a, 5 IT? /
A total of 10 rn'/h of make-up water 3 is required for each hour.
また第３図は第２図と同様２槽タイプであるが、補給水
３を後段の冷却槽にのみ注水し、オーバーフローによっ
て後段の液面レベルを一定に保ち、オーバーフロー水は
前段の冷却槽に注水し、前段の冷却槽の液面レベルが一
定に保たれるようにした。この場合の注水量は第２図の
各々の槽に注水する場合に比べ、半分の１で済む利点が
ある。Fig. 3 shows a two-tank type similar to Fig. 2, but makeup water 3 is injected only into the cooling tank in the latter stage, and the liquid level in the latter stage is kept constant by overflow, and the overflow water is sent to the cooling tank in the former stage. Water was injected to maintain a constant liquid level in the cooling tank at the front stage. In this case, there is an advantage that the amount of water injected is only one half of that in the case of injecting water into each tank as shown in FIG.
〔発明の効果］
本発明による冷却装置を適用することにより、連続焼鈍
における金属ストリップの冷却コストを大幅に削減する
ことができる。[Effects of the Invention] By applying the cooling device according to the present invention, the cost of cooling a metal strip during continuous annealing can be significantly reduced.
第１図、第２図、第３図は本発明の実施例装置のフロー
シート、第４図、第５図は従来例のフローシート、第６
図は連続焼鈍炉の模式図である。
■・・・金属ストリップ
２−・−冷却槽
３・・・補給冷却液
４・・・液温計
５・・・制（卸弁
６・・・補給液ポンプ
７・−・循環冷却液
８・・・制御弁
９・−・循環ポンプ
１０・・・循環液冷却器
１１・・・冷媒
２・・−冷却槽内冷却器
３・・−冷媒
４−・・制御弁
５・−・オーバーフロー冷却液
６・−加熱帯
７・・・均熱帯
８．１９・・・冷却帯
０・・・最終冷却帯FIGS. 1, 2, and 3 are flow sheets of the apparatus according to the embodiment of the present invention, FIGS. 4 and 5 are flow sheets of the conventional example, and FIG.
The figure is a schematic diagram of a continuous annealing furnace. ■...Metal strip 2--Cooling tank 3...Replenishment coolant 4...Liquid temperature gauge 5...Control (discharge valve 6...Replenishment liquid pump 7--Circulating coolant 8)・・Control valve 9・・・・Circulation pump 10・・・Circulating liquid cooler 11・・・Refrigerant 2・・・・Cooling tank cooler 3・・・・Refrigerant 4・・・・Control valve 5・・・・Overflow coolant 6.-Heating zone 7... Soaking zone 8.19... Cooling zone 0... Final cooling zone
Claims (1)
、金属ストリップを冷却液に浸漬冷却を行う冷却槽内に
冷却液を冷却する熱交換器を設け、該冷却槽を１段ある
いは複数段設けたことを特徴とする金属ストリップの冷
却装置。 ２ 請求項１記載の冷却装置において、冷却槽内の冷却
液温を金属ストリップの冷却目標温度から定めた温度に
制御することを特徴とした金属ストリップの温度制御方
法。[Claims] 1. In a continuous annealing furnace for heat-treating a metal strip, a heat exchanger for cooling the cooling liquid is provided in a cooling tank for cooling the metal strip by immersing it in a cooling liquid, and the cooling tank is connected to one stage or A metal strip cooling device characterized by having multiple stages. 2. A method for controlling the temperature of a metal strip in the cooling device according to claim 1, characterized in that the temperature of the cooling liquid in the cooling tank is controlled to a temperature determined from a target temperature for cooling the metal strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18175588A JPH0234727A (en) | 1988-07-22 | 1988-07-22 | Method and device for cooling metallic strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18175588A JPH0234727A (en) | 1988-07-22 | 1988-07-22 | Method and device for cooling metallic strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0234727A true JPH0234727A (en) | 1990-02-05 |
Family
ID=16106320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18175588A Pending JPH0234727A (en) | 1988-07-22 | 1988-07-22 | Method and device for cooling metallic strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0234727A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU671182B2 (en) * | 1992-12-08 | 1996-08-15 | R. Guthrie Research Associates Inc. | Flow control device for the suppression of vortices |
| JP2002212643A (en) * | 2001-01-18 | 2002-07-31 | Kawasaki Steel Corp | Method for producing steel sheet having good surface quality |
| KR101867716B1 (en) * | 2016-12-13 | 2018-06-14 | 주식회사 포스코 | Cooling apparatus, heat treatment apparatus using same, and heat treatment method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5424211A (en) * | 1977-07-26 | 1979-02-23 | Showa Electric Wire & Cable Co Ltd | Cooling method for annealed wire rod |
| JPS5711931A (en) * | 1980-06-25 | 1982-01-21 | Sumitomo Chem Co Ltd | Production of allyl alcohol |
| JPS5791814A (en) * | 1980-11-26 | 1982-06-08 | Nippon Steel Corp | Method and equipment for recovering sensible heat from metallic strip |
-
1988
- 1988-07-22 JP JP18175588A patent/JPH0234727A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5424211A (en) * | 1977-07-26 | 1979-02-23 | Showa Electric Wire & Cable Co Ltd | Cooling method for annealed wire rod |
| JPS5711931A (en) * | 1980-06-25 | 1982-01-21 | Sumitomo Chem Co Ltd | Production of allyl alcohol |
| JPS5791814A (en) * | 1980-11-26 | 1982-06-08 | Nippon Steel Corp | Method and equipment for recovering sensible heat from metallic strip |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU671182B2 (en) * | 1992-12-08 | 1996-08-15 | R. Guthrie Research Associates Inc. | Flow control device for the suppression of vortices |
| JP2002212643A (en) * | 2001-01-18 | 2002-07-31 | Kawasaki Steel Corp | Method for producing steel sheet having good surface quality |
| JP4581251B2 (en) * | 2001-01-18 | 2010-11-17 | Ｊｆｅスチール株式会社 | Manufacturing method of steel sheet with good surface quality |
| KR101867716B1 (en) * | 2016-12-13 | 2018-06-14 | 주식회사 포스코 | Cooling apparatus, heat treatment apparatus using same, and heat treatment method |
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