JPH0135896B2 - - Google Patents
Info
- Publication number
- JPH0135896B2 JPH0135896B2 JP15576780A JP15576780A JPH0135896B2 JP H0135896 B2 JPH0135896 B2 JP H0135896B2 JP 15576780 A JP15576780 A JP 15576780A JP 15576780 A JP15576780 A JP 15576780A JP H0135896 B2 JPH0135896 B2 JP H0135896B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- burner
- hearth
- combustion
- radiant tube
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 239000000567 combustion gas Substances 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 230000005855 radiation Effects 0.000 description 13
- 239000000463 material Substances 0.000 description 7
- 239000000446 fuel Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Description
【発明の詳細な説明】
本発明は、輻射管付き加熱炉に関するもので、
詳しくは、金属圧延機の前で、スラブ、ビレツ
ト、ブルーム等を圧延温度に加熱する金属加熱炉
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating furnace with a radiation tube,
Specifically, the invention relates to a metal heating furnace for heating slabs, billets, blooms, etc. to rolling temperature in front of a metal rolling mill.
従来の金属加熱炉は、燃料をバーナで直接燃焼
させる直火式加熱方法がとられてきた。この場
合、バーナから噴出したガスと燃焼用空気は炉内
空間で混合燃焼するため、最近の炉のごとく、炉
長が30メートル以上、また炉幅が10メートル以上
と、大形化すると、下記の理由から炉下部の炉内
温度の均一化がはかれなくなつてきた。 Conventional metal heating furnaces have used a direct heating method in which fuel is directly combusted in a burner. In this case, the gas ejected from the burner and the combustion air are mixed and combusted in the space inside the furnace, so if the furnace is large, like modern furnaces with a length of 30 meters or more and a furnace width of 10 meters or more, the following For these reasons, it has become difficult to equalize the temperature inside the furnace in the lower part of the furnace.
すなわち、炉の両側面にサイドバーナを設けた
場合は、従来の直火バーナでは大きな噴き出し速
度(たとえば秒速50メートル以上)を与えても、
火炎長さはせいぜい炉幅の1/4程度であり、炉内
の側面近くと中心付近では、100℃以上の温度差
(中心が低温)がつき、この傾向は燃焼量を小さ
くすると、ますます悪化する。さらに、燃焼量を
小さくすると、バーナからの噴き出しエネルギー
が低下するため、炉内のガスの流れ、浮力等によ
り火炎が流され、火炎は被加熱材の端部のみ加熱
する現象も生じていた。以上により、被加熱材は
不均一に加熱されるため、品質の悪化および余分
な燃料の投入などを生じていた。 In other words, when side burners are installed on both sides of the furnace, even if a conventional direct-fired burner provides a high ejection velocity (for example, 50 meters per second or more),
The flame length is at most about 1/4 of the furnace width, and there is a temperature difference of more than 100℃ between the sides and the center of the furnace (the center is colder), and this tendency becomes more pronounced as the combustion rate is reduced. Getting worse. Furthermore, when the combustion amount is reduced, the energy ejected from the burner is reduced, which causes the flame to flow due to the flow of gas in the furnace, buoyancy, etc., and the flame only heats the ends of the material to be heated. As a result of the above, the material to be heated is heated non-uniformly, resulting in deterioration in quality and the need to use extra fuel.
他方、サイドバーナの欠点を改善するために直
火式バーナを炉の長手方向に配置する軸流バーナ
方式もとられてきた。この場合、炉幅方向の温度
分布の向上は得られたが、軸流バーナの取付けの
ため、炉床に山と谷を設ける必要があり、炉の下
部構造が非常に複雑化して保守が困難となるとと
もに、山および谷部にバーナの熱が蓄積して作業
性ならびに作業上の安全性が著しく悪化してい
た。さらに、直火軸流式においては、炉長手方向
において炉下部では、とくに火炎の浮上りにより
温度分布が不均一となる。 On the other hand, in order to improve the drawbacks of side burners, an axial burner system has also been adopted in which direct-fired burners are arranged in the longitudinal direction of the furnace. In this case, the temperature distribution in the width direction of the furnace was improved, but because the axial burner was installed, it was necessary to create peaks and valleys in the hearth, making the lower structure of the furnace extremely complex and difficult to maintain. At the same time, heat from the burner accumulated in the peaks and valleys, significantly deteriorating workability and safety. Furthermore, in the direct-fired axial flow type, the temperature distribution becomes uneven especially in the lower part of the furnace in the longitudinal direction of the furnace due to floating of the flame.
本発明は、上述のような欠点を解消するために
なされたもので、すなわち、本発明は、金属加熱
炉の炉床の保守が容易であり、かつ、該炉床での
熱の蓄積が小さくなつて安全性が向上し、しか
も、炉内温度分布を良好に保つことができるう
え、伝熱量が増大して余分な燃料の投入が回避さ
れる輻射管付き加熱炉を提供することを目的とす
るものである。 The present invention has been made in order to eliminate the above-mentioned drawbacks, namely, the present invention facilitates maintenance of the hearth of a metal heating furnace and reduces heat accumulation in the hearth. The purpose of the present invention is to provide a heating furnace with a radiant tube, which improves safety, maintains a good temperature distribution in the furnace, and increases the amount of heat transfer, thereby avoiding the need to input excess fuel. It is something to do.
このため、本発明の輻射管付き加熱炉の構成
は、金属加熱炉において、平たんな炉床を有し、
かつ、該炉床に設けたバーナと、このバーナの軸
と同軸にして炉内の長手方向に向けられていると
ともに炉内端を開放口として該バーナからの燃焼
火炎および燃焼ガスを炉内に案内する輻射管とか
らなる燃焼装置を備えていることを特徴としてい
る。 For this reason, the configuration of the heating furnace with a radiation tube of the present invention is a metal heating furnace that has a flat hearth,
and a burner provided in the hearth, which is coaxial with the axis of the burner and oriented in the longitudinal direction of the furnace, and has an open end at the end of the furnace to direct combustion flame and combustion gas from the burner into the furnace. It is characterized by being equipped with a combustion device consisting of a guiding radiant tube.
以下、本発明の一実施例について、図面を参照
しながら説明する。 An embodiment of the present invention will be described below with reference to the drawings.
図面において、1は金属加熱炉で、平たんな炉
床2と、内部に金属の被加熱材4を載置移動させ
る炉内ビーム3とを有している。また5は炉床バ
ーナ、6は輻射管である。すなわち、輻射管6
は、炉床バーナ5の軸と同軸になるように設けら
れており、かつ、炉内の長手方向に向けられてい
るとともに、炉内端を開放口7として、該バーナ
5からの燃焼火炎および燃焼ガスを炉内に案内す
るようになつている。そして輻射管6は炉床2に
たまる異物での損傷を小さくするため、輻射管サ
ポート8で炉床2より高い位置に置かれている。
その他、9は上部バーナ、10は前記被加熱材4
の移動方向を示す矢印である。 In the drawings, reference numeral 1 denotes a metal heating furnace, which has a flat hearth 2 and an in-furnace beam 3 in which a metal material to be heated 4 is placed and moved. Further, 5 is a hearth burner, and 6 is a radiant tube. That is, the radiation tube 6
is provided so as to be coaxial with the axis of the hearth burner 5 and is oriented in the longitudinal direction of the furnace, and has an open port 7 at the end of the furnace to allow combustion flames and flames from the burner 5 to flow out. It is designed to guide combustion gas into the furnace. The radiant tube 6 is placed at a higher position than the hearth 2 by a radiant tube support 8 in order to reduce damage caused by foreign matter that accumulates on the hearth 2.
In addition, 9 is an upper burner, 10 is the material to be heated 4
This is an arrow indicating the direction of movement.
このように構成された金属加熱炉1において
は、被加熱材4は炉内ビーム3に載せられて矢印
10の方向に移動しながら、その上部はバーナ9
で加熱され、その下部は炉床バーナ5と輻射管6
の組合せ燃焼器により加熱される。前記バーナ5
と輻射管6は、第3図に拡大して示されているよ
うに、該バーナ5に投入された燃料と燃焼用空気
は、輻射管6内で燃焼し、炉内端の開放口7から
火炎および燃焼ガスが噴出される。したがつて、
火炎および燃焼ガスは輻射管6内を通るため、輻
射管6を加熱するとともに、開放口7により、炉
内の任意所望の適正位置に排出される。なお輻射
管6は、1000℃以下では耐熱鋼を、1000℃をこえ
る場合は炭化けい素等のセラミツク質のものを使
用することが望ましく、また長さについては、炉
の条件により自由に選定することができる。また
第1図に示されるごとく、バーナ5と輻射管6
は、従来の炉のように、1つのゾーンに1列でな
く、2列以上に任意に配置することができるた
め、小形バーナを多数設けることができる。さら
にまた、輻射管6としては図示のように90゜また
はそれ以下の角度に曲つた形が好適であるが、必
要に応じて直管を炉内方向に傾斜させて取付けて
もよい。そしてまた、第3図にみられるように、
開放口7は横向きとし、かつ、開放口7の上部を
延長した切口にすることにより、上方から落ちる
異物の輻射管6内およびバーナ5への落込みを防
止することができる。 In the metal heating furnace 1 configured in this way, the material to be heated 4 is placed on the in-furnace beam 3 and moves in the direction of the arrow 10, while the upper part of the material is placed on the burner 9.
The lower part is heated by a hearth burner 5 and a radiant tube 6.
Heated by a combination combustor. The burner 5
As shown in an enlarged view in FIG. 3, the fuel and combustion air introduced into the burner 5 are combusted within the radiant tube 6 and are ejected from the open port 7 at the end of the furnace. Flame and combustion gases are ejected. Therefore,
The flame and combustion gas pass through the radiant tube 6, thereby heating the radiant tube 6, and are discharged through the open port 7 to any desired position within the furnace. For the radiation tube 6, it is preferable to use heat-resistant steel when the temperature is below 1000°C, and to use ceramic material such as silicon carbide when the temperature exceeds 1000°C, and the length can be selected freely depending on the conditions of the furnace. be able to. In addition, as shown in FIG. 1, the burner 5 and the radiant tube 6
Since the burners can be arbitrarily arranged in one zone in two or more rows instead of in one row as in a conventional furnace, a large number of small burners can be provided. Furthermore, the radiant tube 6 preferably has a shape bent at an angle of 90 degrees or less as shown in the figure, but if necessary, a straight tube may be installed inclined toward the inside of the furnace. Also, as seen in Figure 3,
By oriented the opening 7 horizontally and by making the upper part of the opening 7 an extended cut, it is possible to prevent foreign matter falling from above from falling into the radiation tube 6 and into the burner 5.
上述のように、本発明によれば、炉床バーナか
らの燃焼火炎および燃焼ガスは、炉内の長手方向
に向けた輻射管内で流れがガイドされているた
め、炉下部に山や谷を付けずに該バーナを取付け
ることができるので、炉床部が平たんなものに簡
素化され、保守が容易になるとともに、熱の蓄積
が小さくなつて安全性が向上し、かつ、従来の炉
床のような山を形成させる必要がないため、山部
での被加熱材の温度低下の問題がなくなり、しか
も、火炎が輻射管内でガイドされることにより、
炉内ビームに火炎が当ることを防止でき、炉内ビ
ームの焼損が大幅に低下する。また火炎ばかりで
なく、燃焼ガスも輻射管内を流れるため、燃焼ガ
スは炉内のガス流や浮力の影響を受けることな
く、炉内の任意所望の位置まで行くので、燃焼量
を小さくしても、炉内温度分布を良好に保つこと
ができるのみならず、輻射管からの熱は固体熱放
射となり、輻射能が高いため、伝熱量が増大し、
余分な燃料の投入が回避される。とくに、輻射管
の炉内端を開放口としたので、燃焼ガスは炉内の
適正な所に放出され、対流伝熱の向上と排ガスの
有効利用がはかれる。さらに炉床バーナは炉床構
造に応じてその配置個数を増加することができる
ので、炉内下部の温度分布を均一にすることがで
き、また輻射管の方向は軸流バーナ方式と同等に
なし得る。 As described above, according to the present invention, the flow of the combustion flame and combustion gas from the hearth burner is guided in the radiation tube oriented in the longitudinal direction of the furnace, so that there are no peaks or valleys in the lower part of the furnace. Since the burner can be installed without the need for a conventional hearth, the hearth is simplified into a flat one, making maintenance easier, reducing heat accumulation, and improving safety. Since there is no need to form peaks, there is no problem of the temperature of the heated material decreasing at the peaks, and since the flame is guided within the radiation tube,
It is possible to prevent the flame from hitting the beam in the furnace, and the risk of burnout of the beam in the furnace is greatly reduced. In addition, since not only the flame but also the combustion gas flows inside the radiation tube, the combustion gas can reach any desired position in the furnace without being affected by the gas flow or buoyancy in the furnace, so even if the combustion amount is small, Not only can the temperature distribution inside the furnace be maintained well, but the heat from the radiant tube becomes solid heat radiation, and because the radiation activity is high, the amount of heat transfer increases.
Excess fuel input is avoided. In particular, since the in-furnace end of the radiant tube is an open port, combustion gas is discharged to an appropriate location within the furnace, improving convective heat transfer and effectively utilizing exhaust gas. Furthermore, since the number of hearth burners can be increased depending on the hearth structure, the temperature distribution in the lower part of the furnace can be made uniform, and the direction of the radiation tubes can be adjusted to the same level as in the axial flow burner system. obtain.
図面は本発明の一実施例を示したもので、第1
図は一部を断面で示した側面図、第2図は第1図
の横断面を拡大して示した断面正面図、第3図は
炉床の一部をさらに拡大して示した断面側面図で
ある。
1……金属加熱炉、2……炉床、3……炉内ビ
ーム、4……被加熱材、5……炉床バーナ、6…
…輻射管、7……開放口、8……輻射管サポー
ト、9……上部バーナ。
The drawings show one embodiment of the present invention.
The figure is a side view showing a part of the hearth in cross section, Fig. 2 is a cross-sectional front view showing an enlarged cross section of Fig. 1, and Fig. 3 is a cross-sectional side view showing a part of the hearth further enlarged. It is a diagram. DESCRIPTION OF SYMBOLS 1... Metal heating furnace, 2... Hearth, 3... Furnace beam, 4... Material to be heated, 5... Hearth burner, 6...
...Radiation tube, 7...Open port, 8...Radiation tube support, 9...Upper burner.
Claims (1)
かつ、該炉床に設けたバーナと、このバーナの軸
と同軸にして炉内の長手方向に向けられていると
ともに炉内端を開放口として該バーナからの燃焼
火炎および燃焼ガスを炉内に案内する輻射管とか
らなる燃焼装置を備えていることを特徴とする、
輻射管付き加熱炉。1 A metal heating furnace with a flat hearth,
and a burner provided in the hearth, which is coaxial with the axis of the burner and oriented in the longitudinal direction of the furnace, and has an open end at the end of the furnace to direct combustion flame and combustion gas from the burner into the furnace. characterized by comprising a combustion device consisting of a guiding radiant tube,
Heating furnace with radiant tube.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15576780A JPS5782424A (en) | 1980-11-07 | 1980-11-07 | Heating furnace with radiation pipe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15576780A JPS5782424A (en) | 1980-11-07 | 1980-11-07 | Heating furnace with radiation pipe |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5782424A JPS5782424A (en) | 1982-05-22 |
JPH0135896B2 true JPH0135896B2 (en) | 1989-07-27 |
Family
ID=15612958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15576780A Granted JPS5782424A (en) | 1980-11-07 | 1980-11-07 | Heating furnace with radiation pipe |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5782424A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6137915A (en) * | 1984-07-31 | 1986-02-22 | Kawasaki Steel Corp | Continuous billet heating furnace |
-
1980
- 1980-11-07 JP JP15576780A patent/JPS5782424A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5782424A (en) | 1982-05-22 |
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