JPS5844034B2 - How to prevent water cooling nozzle clogging - Google Patents

How to prevent water cooling nozzle clogging

Info

Publication number
JPS5844034B2
JPS5844034B2 JP53135080A JP13508078A JPS5844034B2 JP S5844034 B2 JPS5844034 B2 JP S5844034B2 JP 53135080 A JP53135080 A JP 53135080A JP 13508078 A JP13508078 A JP 13508078A JP S5844034 B2 JPS5844034 B2 JP S5844034B2
Authority
JP
Japan
Prior art keywords
nozzle
water
cooling
air
amount
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
Application number
JP53135080A
Other languages
Japanese (ja)
Other versions
JPS5561955A (en
Inventor
光宣 森田
正道 大久保
文男 日高
照祥 平岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP53135080A priority Critical patent/JPS5844034B2/en
Publication of JPS5561955A publication Critical patent/JPS5561955A/en
Publication of JPS5844034B2 publication Critical patent/JPS5844034B2/en
Expired legal-status Critical Current

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  • Application Of Or Painting With Fluid Materials (AREA)

Description

【発明の詳細な説明】 本発明は、鋼材冷却プロセスに於いて鋼材冷却用散水ノ
ズルに空気を添加することを特徴とする散水冷却ノズル
詰り防止方法である。
DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for preventing clogging of a water spray cooling nozzle, which is characterized by adding air to a water spray nozzle for cooling steel material during a steel material cooling process.

周知の如く鋼材冷却プロセスに於いて、散水冷却ノズル
詰りは被冷却鋼材の品質や形状に重大な影響を与えるこ
とが多い。
As is well known, in the process of cooling steel materials, clogging of water cooling nozzles often seriously affects the quality and shape of the steel material to be cooled.

この様に鋼材を冷却する場合、特に均一冷却が要求され
るプロセスに於いて散水冷却ノズル詰り防止は必要不可
欠である。
When cooling steel materials in this manner, it is essential to prevent water spray cooling nozzles from clogging, especially in processes that require uniform cooling.

かかる散水冷却ノズル詰りの原因として、大きく分けて
次のことが考えられる。
The causes of such water cooling nozzle clogging can be broadly classified as follows.

(1)散水中あるいは配管の腐蝕などによるスケール性
の異物がノズル先端に運はれてつめる。
(1) Scale foreign matter due to water spraying or corrosion of piping is carried to the nozzle tip and becomes clogged.

(2)散水中のSS(浮遊物質)等が左記水中の有機結
合材と結合し配管に付着し、管内の水の流速の変化によ
りノズル先端に運ばれ、散水停止時に被冷却物からの熱
により焼結されノズルを詰める。
(2) SS (suspended solids) etc. in the water sprinkling combine with the organic binder in the water mentioned on the left and adhere to the pipes, and are carried to the nozzle tip due to changes in the flow rate of the water in the pipes, and when the water sprinkling is stopped, heat from the object to be cooled is released. It is sintered and fills the nozzle.

本発明者らは散水ノズル詰り対策に積極的に取組み鋭意
検討を行なった結果、当然のことながら散水ノズル口径
を大きくすれば詰らないとの結論を得た。
The inventors of the present invention have actively worked on countermeasures against clogging of the water spray nozzle, and as a result of conducting intensive studies, they have naturally concluded that if the diameter of the water spray nozzle is increased, the water spray nozzle will not become clogged.

すなわち本発明者らは表1に示す通常熱鋼材の冷却用と
して用いられる水質のものを使ってノズル径を種々に変
え数ケ月間の長期ランニングテストを行なったところ、
第1図に示す如〈従来ノズル径1間で50%のノズル詰
りか発生していたものがノズル径41nrIL以上では
詰りは皆無となった。
That is, the present inventors conducted a long-term running test for several months using water of the quality normally used for cooling hot steel materials as shown in Table 1, with various nozzle diameters.
As shown in FIG. 1, conventionally only 50% of the nozzles were clogged within a nozzle diameter of 1, but no clogging occurred when the nozzle diameter was 41 nm or more.

このようにノズル詰り対策としてはノズル口径の拡大が
有効である。
As described above, enlarging the nozzle diameter is effective as a countermeasure against nozzle clogging.

しかしながら単にノズル口径を大きくしただけでは、従
来の水量と同一水量にした際にノズル前圧力が低下し散
水パターンの確保がむずかしくなるという問題が発生す
る。
However, simply increasing the nozzle diameter causes a problem in that when the amount of water is the same as the conventional amount, the pressure in front of the nozzle decreases, making it difficult to maintain a water sprinkling pattern.

すなわち散水パターンの維持が可能な水量範囲が狭くな
る。
In other words, the water amount range in which the watering pattern can be maintained becomes narrower.

このことは均一冷却を指向するプロセスに於いて前述の
散水ノズル詰りと同様に被冷却鋼材の品質、形状に重大
な欠陥をもたらす。
In a process aimed at uniform cooling, this causes serious defects in the quality and shape of the steel material to be cooled, similar to the aforementioned clogging of the water spray nozzle.

本発明は散水ノズルの口径を大きくした際の上記散水パ
ターン確保が困難であるという問題を解消し、本来の冷
却作用に伺ら悪影響を与えることなくノズル詰り防止の
ために鋼材冷却用散水ノズルに空気を添加することを特
徴とする。
The present invention solves the problem that it is difficult to secure the water sprinkling pattern when the diameter of the water sprinkling nozzle is increased, and it is used in the water sprinkling nozzle for cooling steel materials in order to prevent nozzle clogging without affecting the original cooling effect. It is characterized by the addition of air.

本発明で添加する空気は水を微細化(噴霧状)させるミ
スト冷却が目的ではなく単に散水パターン形成のために
上記添加空気によるノズル前での噴出流体の体積(流速
)アップを目的としている。
The purpose of the air added in the present invention is not for mist cooling to atomize (spray) water, but simply to increase the volume (flow rate) of the ejected fluid in front of the nozzle in order to form a water spray pattern.

このため、気水冷却本来が持つ (1)散水パターン維持水量範囲が広い (2)冷却能範囲が広い (3)散水ノズル見かけ噴出流速が上がりノズル詰りが
おこりにくい。
For this reason, air-water cooling inherently has (1) a wide water flow rate range for maintaining water sprinkling patterns, (2) a wide range of cooling performance, and (3) an increased apparent jet flow velocity of the water nozzle, making it difficult for nozzle clogging to occur.

という利点の他にミスト冷却と比べて (1)添加空気量が約1/10程度で済むため空気のラ
ンニングコストが安い。
In addition to these advantages, compared to mist cooling, (1) the amount of added air is only about 1/10, so air running costs are low;

(2)水量の変化に対し空気量一定でよいため空気制御
が容易である。
(2) Air control is easy because the amount of air needs to be constant even when the amount of water changes.

等の利点がある。There are advantages such as

すなわち、ミスト冷却がその本来の機能を発揮するには
、均一ミストを作らねばならず、そのため水量変化に応
じて空気量を変化させる必要がある。
That is, in order for mist cooling to perform its original function, it is necessary to create a uniform mist, and therefore it is necessary to change the amount of air in accordance with the change in the amount of water.

これに対して本発明は元来がノズル口径拡大に伴なう水
の流速低下を補なう目的を主に添加するものであって、
水をミストに変化させるものでないから、空気量を水量
変化に追従させて厳密に変化させる必要はなく、水量の
変化に対しても略一定の空気の添加で良いのである。
In contrast, in the present invention, the main purpose of the addition was originally to compensate for the decrease in water flow rate due to the enlargement of the nozzle diameter.
Since water is not changed into mist, it is not necessary to strictly change the amount of air to follow changes in the amount of water, and it is sufficient to add air at a substantially constant level even when the amount of water changes.

そして本発明の実施により散水が一部ミスト化するが被
冷却物に対する冷却能は殆んど差異は生ぜず、本来の冷
却作用に何ら悪影響を与えることはない。
Although some of the water sprinkled becomes mist by implementing the present invention, there is almost no difference in the cooling ability for the object to be cooled, and the original cooling effect is not adversely affected in any way.

本発明の実施に当り、添加する空気の条件は以下の通り
である。
In carrying out the present invention, the conditions for the added air are as follows.

先ず、ノズル口径をノズル詰りの生じない口径、例えば
4m/m以上にした場合に散水パターンを確保するには
、1ノズル当り空気量1001/in以上必要であり、
上限については、1ノズル当り空気量2501/ram
でこれ以上空気量を増加させてもミスト化が進行するの
みで、空気のランニングコストがかさみ経済的でない。
First, in order to ensure a water sprinkling pattern when the nozzle diameter is set to a diameter that does not cause nozzle clogging, for example, 4 m/m or more, an air amount of 1001/in or more is required per nozzle.
For the upper limit, air volume per nozzle is 2501/ram.
Even if the amount of air is increased further, mist will only progress, and the running cost of the air will increase, making it uneconomical.

ちなみに完全ミスト化にするための空気/水の重量比は
0.1以上である。
Incidentally, the air/water weight ratio for complete mist is 0.1 or more.

以上の本発明の実施において、空気等の気体添加に代え
て水等の液体を添加した場合にももちろんパターン形成
は可能であるが、当然のことながらこの場合には被冷却
鋼材に対する冷却作用に変化を及はし好ましくない。
In carrying out the present invention as described above, it is of course possible to form a pattern by adding a liquid such as water instead of adding a gas such as air, but of course in this case the cooling effect on the steel material to be cooled is It is undesirable because it causes change.

次に本発明の装置例を示す。Next, an example of the device of the present invention will be shown.

第2図に示す例は1ケのノズルで鋼材の巾方向全体を冷
却する例である。
The example shown in FIG. 2 is an example in which one nozzle cools the entire width of the steel material.

図中1は鋼材冷却用スプレーノズルであり、ワイドアン
グルフラットノズルであり、2はスプレ一本管、3は空
気添加のための分岐管を示す。
In the figure, 1 is a spray nozzle for cooling steel materials, which is a wide angle flat nozzle, 2 is a main spray pipe, and 3 is a branch pipe for adding air.

7はスプレー水、3′は添加空気を示す。7 indicates spray water and 3' indicates added air.

また4は被冷却鋼材の断面を示す。上記フラットノズル
1の断面形状を第3図に示す。
Further, 4 shows a cross section of the steel material to be cooled. The cross-sectional shape of the flat nozzle 1 is shown in FIG.

aは短径、bは長径を示す。このノズル1の短径aは前
述の如く通常用いられる水質でノズル詰りを生じさせる
ことのない径、すなわち4mm以上を選択する。
a indicates the short axis, and b indicates the long axis. As mentioned above, the minor axis a of the nozzle 1 is selected to be a diameter that does not cause nozzle clogging in the water quality normally used, that is, 4 mm or more.

分岐管3の本管2に対する取り付は角度(空気の吹込み
角度)θは任意の角度で良い。
When attaching the branch pipe 3 to the main pipe 2, the angle (air blowing angle) θ may be any arbitrary angle.

但し分岐管3の取り付は位置(ノズル1先端からの距離
l)を先端から離れ過ぎると、第4図に示す如く、水量
201/mmでは約500山以上で、そして1011/
mrnでは約420mm以上で息つき現象が生じるため
、通常の水量ではでは約500關以下が必要であり、完
全を期するには300yn□以下が好のましい。
However, if the branch pipe 3 is installed too far away from the tip (distance l from the tip of the nozzle 1), as shown in Fig. 4, at a water volume of 201/mm, there will be more than 500 peaks, and 1011/mm.
In mrn, a breathing phenomenon occurs at a depth of about 420 mm or more, so with a normal amount of water, about 500 mm or less is required, and to ensure perfection, 300 yn□ or less is preferable.

更に添加空気量は水量51/關以上に対し空気量250
1/mrrL以上である。
Furthermore, the amount of added air is 250 for the amount of water 51/2 or more.
1/mrrL or more.

以上の構成において、冷却に必要な水量で空気添加を一
切行なわない場合には第2図に点線で示す如く、所望の
散水パターンが確保できない。
In the above configuration, if no air is added in the amount of water required for cooling, the desired water sprinkling pattern cannot be secured as shown by the dotted line in FIG.

これに対し本発明に従い空気添加を行なった場合には、
第2図実線で示す如く、被冷却鋼材4の巾方向全体にわ
たる所望の散水パターンが確保できる。
On the other hand, when air is added according to the present invention,
As shown by the solid line in FIG. 2, a desired water sprinkling pattern can be secured over the entire width of the steel material 4 to be cooled.

なお、第2図の例では、1ケのフラットノズルで鋼材の
巾方向全体を冷却する例を示したが、ノズル噴出角度の
やや小さいものを複数個使用するものであっても良く、
本発明はそれぞれについて実施する。
In addition, in the example of FIG. 2, an example was shown in which the entire width direction of the steel material is cooled with one flat nozzle, but it is also possible to use a plurality of nozzles with a slightly smaller jetting angle.
The invention is implemented for each.

また丸型ノズルを鋼材巾方向で複数用いた場合も同様で
ある。
The same applies when a plurality of round nozzles are used in the width direction of the steel material.

次に本発明の詳細な説明する。Next, the present invention will be explained in detail.

実施例 第2図に示す状態で本発明を実施した。Example The present invention was carried out in the state shown in FIG.

実施条件は第1表の通りである。The implementation conditions are as shown in Table 1.

−E記の条件で100日間本発明を実施したが、その間
ノズル詰りは生じなかった。
The present invention was carried out for 100 days under the conditions described in -E, and no nozzle clogging occurred during that time.

また、その間冷却に起因する品質欠陥の発生は生じなか
った。
Furthermore, no quality defects caused by cooling occurred during this period.

ちなみに本発明実施前はa = 1 mm、b = 8
mmのフラットノズルを使用していたが、そのときに
は1回/10日の頻度でノズル詰りか発生していた。
By the way, before implementing the present invention, a = 1 mm, b = 8
A mm flat nozzle was used, but at that time the nozzle was clogged once every 10 days.

以上記述した様に本発明は鋼材冷却用散水ノズルにパタ
ーン形成のためのみの空気を添加することによりノズル
口径を大きくした際のパターン不形成の問題を解消しノ
ズル詰りか防止できる。
As described above, the present invention solves the problem of pattern non-formation when the nozzle diameter is increased and prevents nozzle clogging by adding air only for pattern formation to a water spray nozzle for cooling steel materials.

しかも通常の完全ミスト冷却に比べ添加空気量は非常に
少なくて済み、経済的であり水量の変化に対し空気量一
定でよいため空気制御が容易である。
Moreover, compared to normal complete mist cooling, the amount of added air is very small, making it economical, and air control is easy because the amount of air remains constant even when the amount of water changes.

応用例 鋼材冷却プロセス特に均一冷却を問題にしているプロセ
スに於いては全て本発明思想が活用できる。
Application Examples The idea of the present invention can be utilized in all steel cooling processes, especially in processes where uniform cooling is a problem.

2〜3例を上げると(1)連続鋳造2次冷却帯(実施例
) (2)連続鋳造および分塊スラブクーラー(3)連続熱
延冷却テーブル等 である。
A few examples are (1) Continuous casting secondary cooling zone (Example) (2) Continuous casting and blooming slab cooler (3) Continuous hot rolling cooling table, etc.

以上のように本発明は鋼材冷却用散水ノズル詰り防止に
寄与すること大である。
As described above, the present invention greatly contributes to preventing clogging of water spray nozzles for cooling steel materials.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はノズル径とノズル詰り率との関係を示す図、第
2図は本発明装置の一例を示す図、第3図は第2図で使
用するノズル断面形状を示す図、第4図はノズル先端か
ら空気吹込み位置までの距離と息つき現象との関係を示
す図である。 1・・・ノズル、2・・・散水本管、3・・・分岐管、
2・・・散水冷却水、3・・・空気、4・・・鋼材。
Fig. 1 is a diagram showing the relationship between nozzle diameter and nozzle clogging rate, Fig. 2 is a diagram showing an example of the device of the present invention, Fig. 3 is a diagram showing the cross-sectional shape of the nozzle used in Fig. 2, and Fig. 4 is a diagram showing the relationship between the distance from the nozzle tip to the air blowing position and the breathing phenomenon. 1... Nozzle, 2... Main water pipe, 3... Branch pipe,
2... Sprinkling cooling water, 3... Air, 4... Steel material.

Claims (1)

【特許請求の範囲】[Claims] 1 通常使用においてノズル詰りを生じる散水冷却ノズ
ルのノズル口径を拡大すると共に、その際の散水の流速
低下を気体添加により補うことを特徴とする散水冷却ノ
ズル詰り防止方法。
1. A method for preventing clogging of a water spray cooling nozzle, which is characterized by enlarging the nozzle diameter of the water spray cooling nozzle, which causes nozzle clogging in normal use, and compensating for the decrease in the flow rate of water at that time by adding gas.
JP53135080A 1978-11-01 1978-11-01 How to prevent water cooling nozzle clogging Expired JPS5844034B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53135080A JPS5844034B2 (en) 1978-11-01 1978-11-01 How to prevent water cooling nozzle clogging

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53135080A JPS5844034B2 (en) 1978-11-01 1978-11-01 How to prevent water cooling nozzle clogging

Publications (2)

Publication Number Publication Date
JPS5561955A JPS5561955A (en) 1980-05-10
JPS5844034B2 true JPS5844034B2 (en) 1983-09-30

Family

ID=15143362

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53135080A Expired JPS5844034B2 (en) 1978-11-01 1978-11-01 How to prevent water cooling nozzle clogging

Country Status (1)

Country Link
JP (1) JPS5844034B2 (en)

Also Published As

Publication number Publication date
JPS5561955A (en) 1980-05-10

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