JP5143507B2 - Continuous heating furnace - Google Patents
Continuous heating furnace Download PDFInfo
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- JP5143507B2 JP5143507B2 JP2007227791A JP2007227791A JP5143507B2 JP 5143507 B2 JP5143507 B2 JP 5143507B2 JP 2007227791 A JP2007227791 A JP 2007227791A JP 2007227791 A JP2007227791 A JP 2007227791A JP 5143507 B2 JP5143507 B2 JP 5143507B2
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Description
本発明は、鋼材を連続搬送して均一加熱する加熱炉に関する。 The present invention relates to a heating furnace that continuously conveys steel and uniformly heats it.
鋼管等の焼入れ、焼戻し熱処理に使用される加熱炉は、たとえば、図５に示すように、バーナ３によって加熱された加熱帯１、均熱帯２内を鋼管８は、ウオーキングビーム７によって、矢印方向に搬送されて連続的に加熱されて、所定温度に保持加熱後、炉出しされて焼入れ焼戻し処理が行われる。
For example, as shown in FIG. 5, the heating furnace used for quenching and tempering heat treatment of steel pipes, etc. is a heating zone 1 heated by a
鋼管の加熱は、炉内の雰囲気温度を所定の温度に設定して、指定温度になるように温度制御が行われる。しかし、炉内は容量が大きいので、バーナ３の近く（以下天井９と呼ぶ）と鋼管８が搬送されるウオーキングビーム７近傍（以下炉床１０と呼ぶ）とでは、温度差が発生しやすいので、鋼管８の均一加熱がむつかしい。
The steel tube is heated by controlling the temperature so that the ambient temperature in the furnace is set to a predetermined temperature and the specified temperature is reached. However, since the capacity of the furnace is large, a temperature difference is likely to occur between the burner 3 (hereinafter referred to as the ceiling 9) and the vicinity of the walking beam 7 (hereinafter referred to as the hearth 10) where the
そこで、炉内雰囲気温度の天井９の近くと炉床１０の近くとの温度差を小さくするためにファン４により燃焼ガスを攪拌したり、バッフル板５で炉床１０上を覆って燃焼ガスを炉内で循環させたり、さらには、バッフル板５内に多数のスリット６を有するスリット板を設けて搬送される鋼管８に均一に燃焼ガスがあたるような工夫がされている。
Therefore, in order to reduce the temperature difference between the furnace atmosphere temperature near the
また特許文献１では、天井及び炉床との間にガス流路を設けたバッフル板と、天井及び炉床に密着したバッフル板とをスラブの進行方向に交互に炉幅方向全面に設けて、ガス流れによる対流伝熱が増加する工夫がなされている。 Moreover, in patent document 1, the baffle board which provided the gas flow path between the ceiling and the hearth, and the baffle board closely_contact | adhered to the ceiling and the hearth are provided in the furnace width direction whole surface alternately by the advancing direction of a slab, A device has been devised to increase convective heat transfer due to gas flow.
しかし、上記した種々の工夫をしても、ファン４との位置的な影響等により、まだ炉床１０近傍の雰囲気温度は、鋼管８の搬送方向にむらがあるのが現状である。
本発明は、上述した問題点を解決して、炉長方向の温度分布を均一にする連続加熱炉を提供すること課題とする。 This invention makes it a subject to provide the continuous heating furnace which solves the problem mentioned above and makes temperature distribution of a furnace length direction uniform.
本発明の加熱炉は、以下の特徴を有する。 The heating furnace of the present invention has the following characteristics.
第一の発明は、鋼材を連続搬送して加熱、均熱する加熱炉であって、燃焼用バーナと燃焼排ガスを炉内で循環するファンと鋼材搬送路を覆って燃焼排ガスを炉床から天井に誘導する仕切り板と鋼材搬送路の上部で仕切り板の下部に燃焼排ガスを整流するスリット板を有し、該スリット板のスリット幅が鋼材搬送方向で変化していることを特徴とする昇温特性、炉温分布特性に優れた連続加熱炉である。 The first invention is a heating furnace that continuously conveys and heats steel material, and heats and soaks the combustion burner, a fan that circulates the combustion exhaust gas in the furnace, and the steel material conveyance path so as to cover the combustion exhaust gas from the hearth. And a slit plate for rectifying the combustion exhaust gas at the lower part of the partition plate at the upper part of the steel material conveyance path, and the slit width of the slit plate varies in the steel material conveyance direction. It is a continuous heating furnace with excellent characteristics and furnace temperature distribution characteristics.
第二の発明は、鋼材搬送方向中央部２５〜３０％長さに位置するスリットの幅が鋼材搬送方向両端部のスリット幅より２０〜３５％大きいことを特徴とする第一の発明に記載の昇温特性、炉温分布特性に優れた連続加熱炉である。 2nd invention is 20-35% larger than the slit width of the steel material conveyance direction center part 25-30% length, and the steel material conveyance direction both ends, As described in 1st invention characterized by the above-mentioned. It is a continuous heating furnace with excellent temperature rise characteristics and furnace temperature distribution characteristics.
スリット幅を鋼材搬送方向位置に応じて変更したので、燃焼排ガスの天井方向から炉床方向への流れがスムースになり連続加熱炉内の炉温分布が均一化した。 Since the slit width was changed according to the steel material conveyance direction position, the flow of combustion exhaust gas from the ceiling direction to the hearth direction became smooth, and the furnace temperature distribution in the continuous heating furnace became uniform.
以下本発明の実施の形態を図面に基づいて説明する。
１．炉の構造について
図５は、本発明の連続加熱炉の全体構造を示す図である。連続炉は、加熱帯１と均熱帯２から構成されている。加熱材料である鋼管８は、加熱帯１入側（図左側）から炉内に装入され、ウオーキングビーム７により矢印方向に搬送されて加熱され、均熱帯２で指定加熱温度に保持された後搬出されていく。
Embodiments of the present invention will be described below with reference to the drawings.
1. FIG. 5 is a diagram showing the overall structure of the continuous heating furnace of the present invention. The continuous furnace is composed of a heating zone 1 and a
炉内は、燃焼バーナ３による燃焼ガスで加熱されるが、炉の天井９側と炉床１０側とでは距離があるので、燃焼排ガスの自然対流にまかせておくと、炉内雰囲気温度にむらが生じる。そこで燃焼排ガスを強制的に循環させて、ウオーキングビーム７上の鋼管８近傍の雰囲気温度が炉幅方向、長さ方向になるべくむらを生じないように工夫がなされている。
Although the inside of the furnace is heated by the combustion gas from the
即ち、鋼管８の搬送路の上部に燃焼排ガスを天井９側からウオーキングビーム７側に送り出すファン４と燃焼排ガスを炉床１０側から天井９のファン４側に誘導する仕切り板５が設置されている。さらにファン４から送り出された燃焼排ガスが局部的に鋼管８に当たらないように、炉幅方向と炉長さ方向にスリット板６が設置されている。そして、燃焼排ガスは、スリット板６に設けられたスリット溝を経由して鋼管８に到達するようになっている。
２．炉の作用について
次に、スリット板６のスリット溝の配置方法により炉内温度の均一度に影響がでることを説明する。
That is, a fan 4 for sending combustion exhaust gas from the
2. Next, it will be described that the uniformity of the temperature in the furnace is affected by the arrangement method of the slit grooves of the
図２にスリット幅、スリット幅範囲（長さ比）を変化させた時の鋼管近傍の雰囲気温度への影響を説明する。図２中の符号は、図１を参照して、スリット幅は、炉入側のスリット幅をＳｔ、炉中央部のスリット幅をＳｍ、炉出口側のスリット幅をＳｅと表記した。そして、各スリット幅の炉長方向長さ範囲を、スリット幅Ｓｔに対応する範囲をｌｔ、スリット幅Ｓｍに対応する範囲をｌｍ、スリット幅Ｓｅに対応する範囲をｌｅと表示した。なおｌｔ、ｌｍ、ｌｅは炉全長ｌｏに対する長さ比で表わされている。 FIG. 2 explains the influence on the ambient temperature in the vicinity of the steel pipe when the slit width and the slit width range (length ratio) are changed. The reference numerals in FIG. 2 refer to FIG. 1, and the slit width is represented by St as the slit width on the furnace entrance side, Sm as the slit width at the center of the furnace, and Se as the slit width at the furnace outlet side. The furnace length direction length range of each slit width is indicated as lt, the range corresponding to the slit width St, lm as the range corresponding to the slit width Sm, and le as the range corresponding to the slit width Se. In addition, lt, lm, and le are represented by the length ratio with respect to the furnace total length lo.
比較例１と比較例２とは、スリット幅は炉全長に渡って１０ｍｍ一定とし、燃焼排ガスの流速は、１４ｍ/ｓｅｃと２０ｍ/ｓｅｃにした場合である。この結果を図示したのが図３のＡ、Ｂであり、加熱帯中央部付近の温度が予定温度より低くなっている。低温部の分布を図４に示す。加熱帯中央部から炉入側にかけて広く低温部が分布しているのが判る。 In Comparative Example 1 and Comparative Example 2, the slit width is fixed to 10 mm over the entire length of the furnace, and the flow rate of the combustion exhaust gas is 14 m / sec and 20 m / sec. The results are shown in FIGS. 3A and 3B, in which the temperature near the center of the heating zone is lower than the planned temperature. The distribution of the low temperature part is shown in FIG. It can be seen that the low temperature part is widely distributed from the center of the heating zone to the furnace entrance side.
一方、発明例１と発明例２は、燃焼排ガスの流速は２０ｍ/ｓｅｃ一定として、発明例１は、炉中央部のスリット幅Ｓｍを１０ｍｍ、炉入側スリット幅Ｓｔを７．５ｍｍ、炉出口側スリット幅Ｓｅを７．５ｍｍとし、Ｓｍの長さ方向範囲ｌｍを２５％、Ｓｔ、Ｓｅの長さ方向範囲ｌｔ、ｌｅは共に３７．５％とした例である。 On the other hand, in Invention Example 1 and Invention Example 2, the flow rate of the combustion exhaust gas is constant at 20 m / sec, and in Invention Example 1, the slit width Sm at the furnace center is 10 mm, the furnace entrance side slit width St is 7.5 mm, and the furnace outlet This is an example in which the side slit width Se is 7.5 mm, the Sm length direction range lm is 25%, and the St and Se length direction ranges lt and le are both 37.5%.
発明例２は、炉中央部のスリット幅Ｓｍを１２ｍｍ、炉入側スリット幅Ｓｔを１０ｍｍ、炉出口側スリット幅Ｓｅを１０ｍｍとし、Ｓｍの長さ方向範囲ｌｍを３０％、Ｓｔ、Ｓｅの長さ方向範囲ｌｔ、ｌｅは共に３５％とした例である。 Invention Example 2 has a slit width Sm of 12 mm at the center of the furnace, a furnace entrance side slit width St of 10 mm, a furnace exit side slit width Se of 10 mm, an Sm length direction range lm of 30%, and a length of St, Se. In this example, both the vertical ranges lt and le are set to 35%.
本発明例では、図１に示すように低温部の分布が比較例１、２に比較して炉中央部で顕著に少なくなっており、また、図３に示すように炉中央部の温度が比較例に比べて高くなっており、炉中央部から炉出側にかけて均一な温度分布となっている。 In the example of the present invention, as shown in FIG. 1, the distribution of the low temperature portion is remarkably reduced in the center of the furnace as compared with Comparative Examples 1 and 2, and the temperature in the center of the furnace is as shown in FIG. It is higher than that of the comparative example, and has a uniform temperature distribution from the furnace center to the furnace exit side.
これにより、発明例１、２は炉長さ中央部の温度が上昇したので、炉入側から炉中央部にかけて、加熱する材料へのエネルギー投入量が増加するので、加熱材料である鋼管８の昇温速度が速くなり、所定均熱温度への到達時間も早くなるので、熱処理の生産性が向上する。
さらに、炉中央部のスリット幅Ｓｍを１２ｍｍとした範囲ｌｍを３０％にした発明例２のほうが、発明例１より雰囲気温度がより高温側にシフトしていることが判る。
Thereby, since the temperature of the center part of the furnace length of Invention Examples 1 and 2 increased, the amount of energy input to the material to be heated increased from the furnace entrance side to the furnace center part. Since the rate of temperature increase is increased and the time for reaching the predetermined soaking temperature is also increased, the productivity of the heat treatment is improved.
Furthermore, it can be seen that the invention example 2 in which the range lm in which the slit width Sm at the center of the furnace is 12 mm is 30%, the ambient temperature is shifted to a higher temperature side than the invention example 1.
本発明は、鋼管の場合について述べたが、鋼板の連続加熱炉においても同様の設備、加熱方法が適用できる。 Although the present invention has been described for the case of a steel pipe, the same equipment and heating method can be applied to a continuous heating furnace for steel plates.
１ 加熱帯
２ 均熱帯
３ バーナ
４ ファン
５ 仕切り板
６ スリット板
７ ウオーキングビーム
８ 鋼管
９ 天井
１０ 炉床
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| JP2007227791A JP5143507B2 (en) | 2007-09-03 | 2007-09-03 | Continuous heating furnace |
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| JP5143507B2 true JP5143507B2 (en) | 2013-02-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105026864A (en) * | 2013-03-08 | 2015-11-04 | 株式会社Ihi | Continuous heating furnace |
| CN111075756A (en) * | 2019-12-16 | 2020-04-28 | 广东美的厨房电器制造有限公司 | Fan, guide plate, heating furnace and microwave heating device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5795560B2 (en) | 2011-07-27 | 2015-10-14 | 中外炉工業株式会社 | Furnace for thermal processing of workpieces |
| CN105441664B (en) * | 2014-09-25 | 2018-06-26 | 宝山钢铁股份有限公司 | For carrying out the open fire tempering furnace and its heating means of tempering heating to plank |
| CN107723437B (en) * | 2017-09-27 | 2024-01-23 | 河南中原特钢装备制造有限公司 | Special furnace for bar destressing |
| CN107794360B (en) * | 2017-11-23 | 2023-08-01 | 浙江中达新材料股份有限公司 | Heat treatment equipment for TP410 seamless tube |
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| JPS5865409U (en) * | 1981-10-27 | 1983-05-04 | タイホ−工業株式会社 | rectifier |
| JPS6244986Y2 (en) * | 1985-01-24 | 1987-11-30 | ||
| JPS6226483A (en) * | 1985-07-26 | 1987-02-04 | 中外炉工業株式会社 | Atmosphere circulation type furnace |
| JPH07212026A (en) * | 1994-01-24 | 1995-08-11 | Matsushita Electric Ind Co Ltd | Electrode part heat treatment device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105026864A (en) * | 2013-03-08 | 2015-11-04 | 株式会社Ihi | Continuous heating furnace |
| CN105026864B (en) * | 2013-03-08 | 2016-11-23 | 株式会社Ihi | Continuous furnace |
| CN111075756A (en) * | 2019-12-16 | 2020-04-28 | 广东美的厨房电器制造有限公司 | Fan, guide plate, heating furnace and microwave heating device |
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| JP2009057621A (en) | 2009-03-19 |
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