JP5338722B2 - Cooling device in continuous annealing furnace - Google Patents
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本発明は連続焼鈍炉における冷却装置に関するものである。 The present invention relates to a cooling device in a continuous annealing furnace.
鋼帯の冷却装置には、従来より、冷却ガスを直接鋼帯に噴射して鋼帯の冷却を行う、いわゆる、ジェットクーラーが採用されている。しかし、ジェットクーラーにおいては、炉内の異物がロールと鋼板の間に噛みこまれて押し疵となり、鋼帯表面に製品欠陥を生じる等、品質上からも問題があった。 Conventionally, a so-called jet cooler that cools a steel strip by injecting a cooling gas directly onto the steel strip has been adopted as a cooling device for the steel strip. However, in the jet cooler, foreign matter in the furnace is caught between the roll and the steel sheet and becomes a pushing rod, which causes a product defect on the surface of the steel strip.
特に、自動車用外板などの美麗な鋼板を製造する連続焼鈍炉においては、これらの押し疵を回避することが求められ、従来、その対策として、ジェットクーラーの風量を下げて冷却ガスの噴流による異物の巻き上がりを防止したり、ラインを定期的に停止して炉内清掃を実施する等の手段が採用されてきた。しかし、ジェットクーラーの風量を下げて操業する場合には生産速度の低下を余儀なくされ、ラインを定期的に停止して炉内清掃を実施する場合には稼働時間の減少を余儀なくされ、いずれも生産性の観点から問題があった。 In particular, in continuous annealing furnaces that produce beautiful steel plates such as automotive outer plates, it is required to avoid these pushing rods. Conventionally, as a countermeasure, the air flow of the jet cooler is lowered and the jet of cooling gas is used. Means such as preventing foreign matter from rolling up and periodically cleaning the furnace by stopping the line have been adopted. However, if the jet cooler is operated with a reduced air flow, the production speed will be reduced, and if the line is shut down periodically to clean the inside of the furnace, the operation time will be reduced. There was a problem from the viewpoint of sex.
ジェットクーラーにおける、前記製品欠陥の問題に対し、本願出願人は、鋼帯とジェットクーラーのノズルヘッダーとの間にメッシュフェンスを設ける構成によって冷却用ガスに混入していたゴミ・錆等の微粉を、メッシュフェンスで除去し、さらに、メッシュフェンスに冷却水を散水する散水ノズルを設ける構成によってメッシュフェンスに付着したゴミ、錆等の微粉を洗い落す技術を開示している(特許文献１)。 In response to the above-mentioned product defect problem in a jet cooler, the applicant of the present application removes fine powder such as dust and rust mixed in the cooling gas by a configuration in which a mesh fence is provided between the steel strip and the nozzle header of the jet cooler. In addition, a technique is disclosed in which fine particles such as dust and rust adhered to the mesh fence are washed away by a configuration in which the mesh fence is provided with a water spray nozzle for spraying cooling water on the mesh fence (Patent Document 1).
しかし、自動車用外板などの美麗な鋼板を製造する連続焼鈍炉に、特許文献１の技術を適用するためには、メッシュフェンスと散水ノズルを新たに設けることが必要なるが通常、焼鈍炉の冷却帯は不活性雰囲気なので、散水すると露点が上昇して鋼板が酸化するため散水することができない。 However, in order to apply the technique of Patent Document 1 to a continuous annealing furnace for producing a beautiful steel plate such as an automobile outer plate, it is necessary to newly provide a mesh fence and a watering nozzle. Since the cooling zone is an inert atmosphere, when the water is sprinkled, the dew point rises and the steel plate is oxidized, so the water cannot be sprinkled.
本発明の目的は前記問題を解決し、鋼帯の冷却装置としてジェットクーラーを採用した連続焼鈍炉において、錆等の異物が冷却ガス噴流に混入して鋼帯の表面に噴射され、鋼帯表面に製品欠陥を生じる問題を、生産性を低下させることなく、かつ大がかりな設備改変によらず、回避可能とした連続焼鈍炉における冷却装置を提供することである。 The object of the present invention is to solve the above problems, and in a continuous annealing furnace adopting a jet cooler as a steel strip cooling device, foreign matter such as rust is mixed with the cooling gas jet and injected onto the surface of the steel strip, It is an object of the present invention to provide a cooling apparatus in a continuous annealing furnace that can avoid the problem of causing product defects without reducing productivity and without making major equipment modifications.
上記課題を解決するためになされた本発明の連続焼鈍炉における炉内の冷却装置は、連続焼鈍炉内雰囲気ガスの一部を吸引する遠心式循環ブロワと、遠心式循環ブロワの前段に設けられ、吸引された連続焼鈍炉内雰囲気ガスの冷却を行う熱交換器と、熱交換器の後段に設けられた遠心式循環ブロワで昇圧された冷却ガスを、連続焼鈍炉内に返送する冷却ガス返送管と、冷却ガス返送管の先端にあって冷却ガスを連続焼鈍炉へ吹き込む冷却ノズルとを有する連続焼鈍炉における炉内の冷却装置において、冷却ガス返送管から冷却ガスの一部を吸引後、異物除去処理を行うサイクロンと、異物除去処理後の清浄ガスを、遠心式循環ブロワの前段に返送する清浄ガス返送管を備えることを特徴とするものである。 The cooling device in the furnace in the continuous annealing furnace of the present invention, which has been made to solve the above-mentioned problems, is provided in a preceding stage of the centrifugal circulation blower that sucks a part of the atmospheric gas in the continuous annealing furnace, and the centrifugal circulation blower. Cooling gas return for returning the suctioned atmospheric gas in the continuous annealing furnace and the cooling gas boosted by the centrifugal circulation blower provided at the subsequent stage of the heat exchanger to the continuous annealing furnace In a cooling device in the furnace in a continuous annealing furnace having a pipe and a cooling nozzle at the tip of the cooling gas return pipe and blowing the cooling gas into the continuous annealing furnace, after sucking a part of the cooling gas from the cooling gas return pipe, A cyclone for performing the foreign substance removal process and a clean gas return pipe for returning the clean gas after the foreign substance removal process to the front stage of the centrifugal circulation blower are provided.
請求項２記載の発明は、請求項１記載の連続焼鈍炉における炉内の冷却装置において、循環ブロワは、内部に回転羽根を備え、冷却ガス返送管は、回転羽根の回転中心軸より下側位置で、循環ブロワと連結し、循環ブロワから冷却ガス返送管に送りだされる冷却ガスの内、回転羽根の回転円の接線方向へ送りだされる冷却ガスをサイクロンに吸引することを特徴とするものである。 According to a second aspect of the present invention, in the in-furnace cooling apparatus of the continuous annealing furnace according to the first aspect, the circulating blower includes a rotating blade inside, and the cooling gas return pipe is below the rotation center axis of the rotating blade. It is connected to the circulation blower at the position, and among the cooling gas sent from the circulation blower to the cooling gas return pipe, the cooling gas sent in the tangential direction of the rotating circle of the rotary blade is sucked into the cyclone. To do.
本発明に係る連続焼鈍炉における炉内の冷却装置は、鋼帯の冷却装置として、連続焼鈍炉内雰囲気ガスの一部を吸引・冷却して利用する循環式のジェットクーラーを採用した従来の連続焼鈍炉において、連続焼鈍炉内雰囲気ガスの一部を遠心式循環ブロワで吸引し、冷却後に連続焼鈍炉内に返送する冷却ガス返送管から、冷却ガスの一部を吸引後、異物除去処理を行うサイクロンと、異物除去処理後の清浄ガスを、循環ブロワの前段に返送する清浄ガス返送管を備える構成により、連続焼鈍炉内に返送する冷却ガスに含まれる異物を除去可能とした。すなわち、本発明の構成によれば、鋼帯の冷却装置としてジェットクーラーを採用した連続焼鈍炉において、冷却ガスの噴射時に巻き上げられた炉内の異物が、ロールと鋼板の間に噛みこまれて押し疵となり、鋼帯表面に製品欠陥を生じる問題を、生産性を低下させることなく、かつ大がかりな設備改変によらず、回避可能することができる。 The cooling apparatus in the furnace in the continuous annealing furnace according to the present invention is a conventional continuous cooling apparatus that employs a circulating jet cooler that sucks and cools part of the atmospheric gas in the continuous annealing furnace as a steel strip cooling apparatus. In the annealing furnace, a part of the atmospheric gas in the continuous annealing furnace is sucked by a centrifugal circulation blower, and after cooling, a part of the cooling gas is sucked from the cooling gas return pipe that is returned to the continuous annealing furnace, and then the foreign matter is removed. The structure including the clean gas return pipe that returns the cyclone to be performed and the clean gas after the foreign matter removal treatment to the front stage of the circulation blower makes it possible to remove foreign matters contained in the cooling gas returned to the continuous annealing furnace. That is, according to the configuration of the present invention, in the continuous annealing furnace adopting a jet cooler as a steel strip cooling device, the foreign matter in the furnace wound up during the injection of the cooling gas is caught between the roll and the steel plate. The problem of causing product defects on the surface of the steel strip can be avoided without reducing productivity and without major equipment modification.
循環ブロワに導入された連続焼鈍炉内雰囲気ガス中の異物は、回転羽根の遠心力により、大きな異物程、外側に濃化していく。従って、請求項２記載の発明のように、循環ブロワから冷却ガス返送管に送りだされる冷却ガスの内、回転羽根の回転円の接線方向へ送りだされる冷却ガスをサイクロンに吸引する構成によれば、最小限の処理量で効率的な異物除去が可能となる。 The foreign matter in the atmospheric gas in the continuous annealing furnace introduced into the circulation blower is concentrated on the outside by the larger foreign matter due to the centrifugal force of the rotating blades. Therefore, as in the invention described in claim 2, of the cooling gas sent from the circulation blower to the cooling gas return pipe, the cooling gas sent in the tangential direction of the rotating circle of the rotary blade is sucked into the cyclone. According to this, it is possible to efficiently remove foreign matters with a minimum processing amount.
以下に本発明の好ましい実施形態を示す。 Preferred embodiments of the present invention are shown below.
本発明に係る連続焼鈍炉における炉内の冷却装置は、図１に示すように、連続焼鈍炉６の炉内雰囲気ガスの一部を吸引する遠心式循環ブロワ１と、遠心式循環ブロワの前段に設けられ、吸引された連続焼鈍炉内雰囲気ガスの冷却を行う熱交換器４と、熱交換器の後段に設けられた遠心式循環ブロワ１で昇圧された冷却ガスを、連続焼鈍炉内に返送する冷却ガス返送管７と、冷却ガス返送管７の先端にあって冷却ガスを連続焼鈍炉へ吹き込む冷却ノズル３と、冷却ガス返送管７から冷却ガスの一部を吸引後、異物除去処理を行うサイクロン２と、異物除去処理後の清浄ガスを、循環ブロワ１の前段に返送する清浄ガス返送管８を備えている。
As shown in FIG. 1, the cooling device in the furnace in the continuous annealing furnace according to the present invention includes a centrifugal circulation blower 1 for sucking a part of the atmospheric gas in the furnace of the continuous annealing furnace 6, and a front stage of the centrifugal circulation blower. The cooling gas boosted by the heat exchanger 4 for cooling the suctioned atmospheric gas in the continuous annealing furnace and the centrifugal circulation blower 1 provided at the subsequent stage of the heat exchanger is placed in the continuous annealing furnace. The cooling
遠心式循環ブロワ１は、内部に回転羽根９を備え、冷却ガス返送管７は、回転羽根９の回転中心軸より下側位置で、遠心式循環ブロワ１と連結し、遠心式循環ブロワ１から冷却ガス返送管７に送りだされる冷却ガスのうち、回転羽根９の回転円の接線方向へ送りだされる冷却ガスは、サイクロン２に吸引される。
The centrifugal circulation blower 1 includes a rotary blade 9 inside, and the cooling
連続焼鈍炉６の炉内から吸引された炉内雰囲気ガスには、ゴミ・錆等の異物が混入している。遠心式循環ブロワ１に導入された連続焼鈍炉内雰囲気ガス中の異物は、回転羽根９の遠心力により、大きな異物程、遠心式循環ブロワ１の外側に濃化していく。従って、回転羽根９の回転円の接線方向へ送りだされる冷却ガスには、高濃度の異物が混入している。本発明では、高濃度の異物が混入した冷却ガスを選択的にサイクロン２に吸引して異物除去後に、清浄ガスを遠心式循環ブロワ１の前段に返送する構成により、最小限の処理量で効率的な異物除去を可能としている。 Foreign matter such as dust and rust is mixed in the furnace atmosphere gas sucked from the inside of the continuous annealing furnace 6. Foreign matter in the atmospheric gas in the continuous annealing furnace introduced into the centrifugal circulation blower 1 is concentrated on the outside of the centrifugal circulation blower 1 by a larger foreign matter due to the centrifugal force of the rotary blade 9. Therefore, high-concentration foreign matter is mixed in the cooling gas sent in the tangential direction of the rotating circle of the rotary blade 9. In the present invention, the cooling gas mixed with the high-concentration foreign matter is selectively sucked into the cyclone 2 to remove the foreign matter, and then the clean gas is returned to the front stage of the centrifugal circulation blower 1 so that the processing efficiency is minimized. This makes it possible to remove foreign matter.
本発明では、遠心式循環ブロワ１で、異物を遠心式循環ブロワ１外側に濃化した後、高濃度の異物が混入した冷却ガスを選択的にサイクロン２に吸引するため、異物除去目的でサイクロン２内に抜き取るガスを最小量に抑えることが可能となり、これによりサイクロン２で発生する圧力損失も最小限に抑えることができる。 In the present invention, the centrifugal circulation blower 1 concentrates foreign matters on the outside of the centrifugal circulation blower 1 and then selectively sucks the cooling gas mixed with high concentration foreign matters into the cyclone 2. It is possible to suppress the gas extracted into the cylinder 2 to a minimum amount, and thereby the pressure loss generated in the cyclone 2 can be suppressed to the minimum.
また、本発明のように、遠心式循環ブロワ１の吐出側からサイクロン２に流れ、その後、遠心式循環ブロワ１吸引側へ戻るガスの流路が設けられた場合、遠心式循環ブロワ１の能力（風量、風圧）が低下することが懸念されるが、本発明では前記のように、異物除去目的でサイクロン２内に抜き取るガスを最小量に抑えることができるため、遠心式循環ブロワ１の能力低下代も最小限に抑えることができ、遠心式循環ブロワ１の増強等の追加設備投資は不要である。 In addition, as in the present invention, when a gas flow path that flows from the discharge side of the centrifugal circulation blower 1 to the cyclone 2 and then returns to the centrifugal circulation blower 1 suction side is provided, the capability of the centrifugal circulation blower 1 Although there is a concern that the (air volume, wind pressure) will decrease, in the present invention, as described above, the gas extracted into the cyclone 2 for the purpose of removing foreign substances can be suppressed to a minimum amount. The reduction allowance can also be minimized, and no additional equipment investment such as the enhancement of the centrifugal circulation blower 1 is required.
サイクロン２は、従来一般に使用されるものを用いればよい。サイクロン形状は、除去したい異物の直径と密度、流体の物性と風量などによりサイクロン形状決定をする従来公知の一般式に従って決定すればよい。なお、サイクロンの下部に２重の弁を設ける構成とすれば、操業中に捕集した異物を回収できる。 What is necessary is just to use what is conventionally used for the cyclone 2 conventionally. The cyclone shape may be determined according to a conventionally known general formula that determines the cyclone shape based on the diameter and density of the foreign substance to be removed, the physical properties of the fluid, and the air volume. In addition, if it is set as the structure which provides a double valve in the lower part of a cyclone, the foreign material collected during operation can be collect | recovered.
図１に示す連続焼鈍炉における炉内の冷却装置を用いて、連続焼鈍炉６内から炉内雰囲気ガス（５００〜６００℃）を吸引し、熱交換器４に導入して水で間接的に冷却（２００〜３００℃）を行った後、吸引したガスを遠心式循環ブロワ１（５５０ｍ３/分）に導入し、回転羽根９により昇圧した。この時、ガス中の異物は、遠心力により大径のものほど、遠心式循環ブロワ１の外側に濃化している。その結果、遠心式循環ブロワ１の出口底部の異物濃度が高くなっている。 Using the cooling device in the furnace in the continuous annealing furnace shown in FIG. 1, the atmospheric gas (500 to 600 ° C.) in the furnace is sucked from the continuous annealing furnace 6 and introduced into the heat exchanger 4 and indirectly with water. After cooling (200 to 300 ° C.), the sucked gas was introduced into the centrifugal circulation blower 1 (550 m 3 / min), and the pressure was increased by the rotary blade 9. At this time, foreign substances in the gas are concentrated on the outside of the centrifugal circulation blower 1 as the diameter increases due to centrifugal force. As a result, the foreign matter concentration at the outlet bottom of the centrifugal circulation blower 1 is high.
遠心式循環ブロワ１の出口底部とサイクロン２（φ３００ｍｍ*L６００ｍｍ）の入側を接続し、サイクロン２の出側と遠心式循環ブロワ１の入側を接続すると、遠心式循環ブロワ１の出側の圧力が高く（１〜３ｋpa）、遠心式循環ブロワ１の入側の圧力が低い（０〜数pa）ため、サイクロン２に前記の異物濃度が高いガスが流れる。 When the outlet bottom of the centrifugal circulation blower 1 is connected to the inlet side of the cyclone 2 (φ300 mm * L600 mm) and the outlet side of the cyclone 2 is connected to the inlet side of the centrifugal circulation blower 1, the outlet side of the centrifugal circulation blower 1 is connected. Since the pressure is high (1 to 3 kPa) and the pressure on the inlet side of the centrifugal circulation blower 1 is low (0 to several pa), the gas having a high foreign matter concentration flows through the cyclone 2.
このようにして、サイクロン２に前記の異物濃度が高いガスを導入して、異物除去を行った。本実施例では、５０μｍ以上の異物は底部に沈降し、清浄なガスは上部より排出されるサイクロンを使用した。 In this way, the gas having a high foreign matter concentration was introduced into the cyclone 2 to remove the foreign matter. In this example, a cyclone in which foreign matters of 50 μm or more settled to the bottom and clean gas was discharged from the top was used.
図２には、上記実施例により異物除去処理を行った結果を示している。図２に示すように、本発明によれば、従来法に比べ炉内の有害な（５０μｍ以上）異物個数が減少し、その結果、鋼板表面の異物噛みこみによる押し疵の深さも約半分に改善された。 FIG. 2 shows the result of the foreign substance removal process performed by the above embodiment. As shown in FIG. 2, according to the present invention, the number of harmful (more than 50 μm) foreign matter in the furnace is reduced compared to the conventional method, and as a result, the depth of the pushing rod due to the inclusion of foreign matter on the surface of the steel sheet is also halved. Improved.
１ 遠心式循環ブロワ
２ サイクロン
３ 冷却ノズル
４ 熱交換器
５ 鋼板
６ 連続焼鈍炉
７ 冷却ガス返送管
８ 清浄ガス返送管
９ 回転羽根
DESCRIPTION OF SYMBOLS 1 Centrifugal circulation blower 2 Cyclone 3 Cooling nozzle 4 Heat exchanger 5 Steel plate 6 Continuous annealing
Claims (2)
冷却ガス返送管から冷却ガスの一部を吸引後、異物除去処理を行うサイクロンと、異物除去処理後の清浄ガスを、遠心式循環ブロワの前段に返送する清浄ガス返送管を備えることを特徴とする連続焼鈍炉における炉内の冷却装置。 A centrifugal circulation blower that sucks a part of the atmosphere gas in the continuous annealing furnace, a heat exchanger that is provided in the front stage of the centrifugal circulation blower and cools the sucked continuous annealing furnace atmosphere gas, and a heat exchanger A cooling gas return pipe that returns the pressure of the cooling gas from the centrifugal circulation blower provided in the subsequent stage into the continuous annealing furnace, and a cooling nozzle that blows the cooling gas into the continuous annealing furnace at the tip of the cooling gas return pipe. In the furnace cooling device in a continuous annealing furnace having
A cyclone for removing foreign substances after sucking a part of the cooling gas from the cooling gas return pipe and a clean gas return pipe for returning the clean gas after the foreign substance removal process to the front stage of the centrifugal circulation blower are provided. In-furnace cooling device in a continuous annealing furnace.
ことを特徴とする請求項１記載の連続焼鈍炉における炉内の冷却装置。 The circulation blower has a rotating blade inside, and the cooling gas return pipe is connected to the circulation blower at a position below the rotation center axis of the rotation blade, and the cooling gas sent from the circulation blower to the cooling gas return pipe. The cooling device in a furnace in a continuous annealing furnace according to claim 1, wherein the cooling gas sent in the tangential direction of the rotating circle of the rotary blade is sucked into the cyclone.
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| KR101181914B1 (en) | 2012-03-19 | 2012-09-11 | 우진전기 주식회사 | Heat treating furnace of amorphous core |
| CN104928447A (en) * | 2015-06-02 | 2015-09-23 | 秦皇岛开发区春光铸造机械有限公司 | Suspension type workpiece air cooling device |
| KR102080934B1 (en) * | 2018-04-18 | 2020-02-24 | (주)알룩스메뉴펙처링 | air quenching device for cylinder block and cylinder head |
| CN108913870A (en) * | 2018-09-21 | 2018-11-30 | 山东宏旺实业有限公司 | A kind of air-cooled section of cooling means of annealing furnace and system |
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| JPH0216994Y2 (en) * | 1985-03-27 | 1990-05-11 | ||
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| JPH0768587B2 (en) * | 1987-10-08 | 1995-07-26 | 日本鋼管株式会社 | Continuous annealing furnace equipped with gas circulation device |
| JPH05302736A (en) * | 1992-02-24 | 1993-11-16 | Nec Environment Eng Ltd | Method and apparatus for generating negative ion, and air purifying method and apparatus utilizing generation of negative ion |
| JP2917724B2 (en) * | 1993-01-18 | 1999-07-12 | 日本鋼管株式会社 | Cooling method for metal strip in continuous annealing furnace |
| JP4575612B2 (en) * | 2001-03-28 | 2010-11-04 | 日新製鋼株式会社 | Vertical continuous annealing equipment |
| JP5489734B2 (en) * | 2010-01-15 | 2014-05-14 | 日本金属工業株式会社 | Continuous annealing furnace |
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