JP5143507B2 - Continuous heating furnace - Google Patents
Continuous heating furnace Download PDFInfo
- Publication number
- 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
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- temperature
- exhaust gas
- steel material
- slit width
- 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.)
- Active
Links
Images
Landscapes
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
- Tunnel Furnaces (AREA)
- Furnace Details (AREA)
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
DESCRIPTION OF SYMBOLS 1
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007227791A JP5143507B2 (en) | 2007-09-03 | 2007-09-03 | Continuous heating furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007227791A JP5143507B2 (en) | 2007-09-03 | 2007-09-03 | Continuous heating furnace |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2009057621A JP2009057621A (en) | 2009-03-19 |
JP5143507B2 true JP5143507B2 (en) | 2013-02-13 |
Family
ID=40553630
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2007227791A Active JP5143507B2 (en) | 2007-09-03 | 2007-09-03 | Continuous heating furnace |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP5143507B2 (en) |
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 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
2007
- 2007-09-03 JP JP2007227791A patent/JP5143507B2/en active Active
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 |
Also Published As
Publication number | Publication date |
---|---|
JP2009057621A (en) | 2009-03-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5143507B2 (en) | Continuous heating furnace | |
CA2912922C (en) | Transporting device for hot and thin-walled steel parts | |
KR101537273B1 (en) | Continuous firing furnace | |
CA2768098C (en) | Method and strand sintering equipment for continuous sintering of pelletized mineral material | |
CN105936965B (en) | Heat treatment apparatus and heat treatment method | |
JP5401015B2 (en) | Continuous firing furnace | |
JP4982763B2 (en) | Continuous heat treatment furnace | |
US20180258506A1 (en) | Heat treatment system | |
JP6440436B2 (en) | Heat treatment equipment and heat treatment method for cylindrical plate coil | |
JP2018172714A (en) | Oil quenching apparatus and heat treatment apparatus | |
JP2014005957A (en) | Walking beam furnace | |
JP5907108B2 (en) | Heat treatment method for steel sheet | |
JP6900123B2 (en) | How to modify continuous heat treatment equipment and continuous heat treatment equipment | |
US20150352621A1 (en) | Heating device for hot stamping | |
JP6767784B2 (en) | Continuous heat treatment furnace | |
JP2007263480A (en) | Muffle furnace | |
JP2006152336A (en) | Conveying device in continuous heat treatment furnace for metal strip | |
JP6233267B2 (en) | Baking furnace and method for controlling atmosphere in baking furnace | |
JP4378549B2 (en) | Firing equipment | |
JP2017067438A (en) | Muffle furnace | |
JP6064199B2 (en) | Heat treatment equipment | |
JPH10237555A (en) | Equipment and method for continuous heat treatment of metallic strip | |
JP5037210B2 (en) | Cooling device for in-furnace transport roll of continuous heat treatment furnace | |
JP5098201B2 (en) | Method for tempering thick steel plates | |
JP6123954B1 (en) | Manufacturing method of high silicon steel strip by continuous siliconization method |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20100726 |
|
RD03 | Notification of appointment of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7423 Effective date: 20120326 |
|
RD04 | Notification of resignation of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7424 Effective date: 20120329 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20120326 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20120831 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20120911 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20121017 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20121113 |
|
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20121121 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20151130 Year of fee payment: 3 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 5143507 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |