JPS6315007A - Combustion air preheat device for burner in radiant tube - Google Patents
Combustion air preheat device for burner in radiant tubeInfo
- Publication number
- JPS6315007A JPS6315007A JP61157875A JP15787586A JPS6315007A JP S6315007 A JPS6315007 A JP S6315007A JP 61157875 A JP61157875 A JP 61157875A JP 15787586 A JP15787586 A JP 15787586A JP S6315007 A JPS6315007 A JP S6315007A
- Authority
- JP
- Japan
- Prior art keywords
- radiant tube
- heat exchange
- air
- burner
- 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.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 241000287227 Fringillidae Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Air Supply (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、金属鋼帯加熱炉のラジアントデユープに配置
し、ラジアントチューブ内バーナに供給する燃焼空気１
度を高めるためのラジアン１−チューブ内バーナの燃焼
空気予熱装置に関する。Detailed Description of the Invention <Industrial Application Field> The present invention provides combustion air 1 arranged in a radiant duplex of a metal steel strip heating furnace and supplied to a burner in the radiant tube.
Regarding the combustion air preheating device of the Radian 1-tube burner for increasing the temperature.
〈従来の技術〉
従来のこの種のラジアントチューブ内バーナの燃焼空気
予熱装置は、第３図に示すようにラジアントチューブ１
内にレキュペレータ（ｒｅｃｕｐｅｒａｔｏｒ） ２を
取り付け、レキュペレータ２内を流れるエアー（空気）
とレキュペレータ外ラジアントチューブ内を流れる高温
の排気ガス間に熱交換させてエアーを予熱し、バーナに
供給するようにしていた。<Prior Art> A conventional combustion air preheating device for a burner in a radiant tube of this type has a radiant tube 1 as shown in FIG.
A recuperator 2 is installed inside the recuperator 2, and air flows through the recuperator 2.
The air was preheated by heat exchange between the exhaust gas and the high-temperature exhaust gas flowing inside the radiant tube outside the recuperator, and then supplied to the burner.
〈発明が解決しようとする問題点〉
ところが、上述した構成の従来のラジアントチューブ内
バーナの燃焼空気予熱装置は、ラジアントチューブ内に
熱交換手段としてのレキュペレータを装着しているため
に、次のような不具合な点があった。<Problems to be Solved by the Invention> However, the conventional combustion air preheating device for a burner in a radiant tube having the above-mentioned configuration has the following problems because a recuperator as a heat exchange means is installed inside the radiant tube. There were some problems.
の 熱放散（エネルギーロス）が大である。Heat dissipation (energy loss) is large.
６ Ｍ交換面が小さく、ラジアントチューブ内バーナ
に供給するエアーの加熱能力が制限される。6M The exchange surface is small, which limits the heating ability of the air supplied to the burner inside the radiant tube.
このうち、のの不具合は、レキュペレータ装着部分のラ
ジアントチューブ温が通常６００℃以上の高温になるた
めに起る問題であって、レキュペレータ直前（上流）の
排ガス温度は６００℃以上、直後（下流）のそれは４０
０℃以上である。放熱による熱損失を低くするには、そ
の部分のライニングを強化しなければならない。Of these, the problem is caused by the temperature of the radiant tube at the part where the recuperator is installed, which is usually over 600°C, and the exhaust gas temperature just before the recuperator (upstream) is over 600°C, and the temperature immediately after the recuperator (downstream) is over 600°C. That is 40
The temperature is 0°C or higher. In order to reduce heat loss due to heat radiation, the lining in that area must be strengthened.
しかし、このようにライニングを強化するとバーナバン
クが大となり、保守管理が困難となる。However, strengthening the lining in this way increases the burner bank, making maintenance management difficult.
また、フランジ部分にもライニングを施すとボルトの増
締めができずすき間が生じるので、そこからエアーが吸
い込まれる危険がある。Furthermore, if the flange portion is also lined, the bolts cannot be tightened further and a gap is created, which poses the risk of air being sucked in.
そしてエアーが吸い込まれると燃焼空気温を低下させる
ばかりでなく、酸素量が変化し、酸素量のコントロール
ができな（なる。したがって、パンク部分のラジアント
チューブ温はできるだけ低い方がよい。When air is sucked in, it not only lowers the combustion air temperature, but also changes the amount of oxygen, making it impossible to control the amount of oxygen.Therefore, it is better to keep the radiant tube temperature at the punctured part as low as possible.
０については、エアレキュペレータの長さをあまり長大
にすると、ストリップ前面のラジアントチューブ温が低
くなるために、レキ二ペレータの長さを余り長（できな
いために生じる問題である。すなわち、従来のラジアン
トチューブ内バーナの燃焼空気予熱装置では、排ガスと
の熱交換後のエア一温度は３００〜４５０℃が限度であ
った。Regarding 0, if the length of the air recuperator is made too long, the temperature of the radiant tube at the front of the strip will become low. In the combustion air preheating device for the burner in the radiant tube, the temperature of the air after heat exchange with the exhaust gas is limited to 300 to 450°C.
本発明は、このような従来構造のラジアントチューブ内
バーナの燃焼空気予熱装置の不具合を除去するためにな
されたものであって、熱放散量が少なく、かつ熱交換面
（伝熱面）が大きく、ラジアントチューブ内バーナへの
供給燃焼空気の予熱温度を高めることができるラジアン
トチューブ内バーナの燃焼空気予熱装置を提供しようと
するものである。The present invention was made in order to eliminate the problems of the combustion air preheating device of the burner in the radiant tube of the conventional structure. An object of the present invention is to provide a combustion air preheating device for a radiant tube burner, which can increase the preheating temperature of combustion air supplied to the radiant tube burner.
く問題点を解決するための手段〉
上述の目的を達成するための、本発明のラジアントチュ
ーブ内バーナの燃焼空気予熱装置は、ラジアントチュー
ブの外周には一次熱交換手段を設け、ラジアントチュー
ブ内には二次熱交換手段を設けると共に、前記−次熱交
換手段および二次熱交換手段間をエアー循環管で接続し
、ラジアントチューブ内バーナに供給する空気を一次熱
交換手段および二次熱交換手段の順に流して燃焼排ガス
との熱交換により予熱することを特徴とするものである
。Means for Solving the Problems〉 In order to achieve the above-mentioned object, the combustion air preheating device for a burner in a radiant tube of the present invention provides a primary heat exchange means on the outer periphery of the radiant tube, In addition to providing a secondary heat exchange means, an air circulation pipe connects the secondary heat exchange means and the secondary heat exchange means, and the air to be supplied to the burner in the radiant tube is supplied to the primary heat exchange means and the secondary heat exchange means. It is characterized by preheating by heat exchange with combustion exhaust gas by flowing in the following order.
く作 用〉
したがって、−次熱交換手段に入ったエアーは、−次熱
交換手段の通る間に加熱され、エアー循環管内を通って
、二次熱交換手段内に導入されてより高温に予加熱され
てからラジアントチューブ内バーナへ送ることができる
。Therefore, the air that has entered the secondary heat exchange means is heated while passing through the secondary heat exchange means, passes through the air circulation pipe, is introduced into the secondary heat exchange means, and is preheated to a higher temperature. After being heated, it can be sent to the burner in the radiant tube.
く実 施 例〉 次に、本発明の代表的な実施例について説明する。Example of implementation Next, typical embodiments of the present invention will be described.
第１図は本発明にかかるラジアントチューブ内バーナの
燃焼空気予熱装置の一実施例の概略構成を示す要部断面
図である。第１図中の１はラジアントチューブ、１ａは
ラジアントチューブ１の後端部に形成したフランジ、２
はラジアントチューブ内部に設けたレキュペレータ、３
はエアー循環管、４はラジアントチューブ外部に設けた
レキュペレータ、４ａは外筒、４ｂは螺旋管、５はライ
ニングである。FIG. 1 is a sectional view of a main part showing a schematic configuration of an embodiment of a combustion air preheating device for a radiant tube internal burner according to the present invention. 1 in FIG. 1 is a radiant tube, 1a is a flange formed at the rear end of the radiant tube 1, and 2
is a recuperator installed inside the radiant tube, 3
4 is an air circulation pipe, 4 is a recuperator provided outside the radiant tube, 4a is an outer cylinder, 4b is a spiral tube, and 5 is a lining.
レキュペレータ４には、ラジアントチューブ１の後端フ
ランジ１ａからラジアントチューブ１の外周面を囲繞す
るように取り付けた螺旋管４ｂが設けられている。そし
て螺旋管４ｂの先端部附近からラジアントチューブ１の
外周面に一定の間隙を有して、螺旋管４ｂを覆うように
してスカート状の外筒４ａが設けている。The recuperator 4 is provided with a spiral tube 4b attached to the rear end flange 1a of the radiant tube 1 so as to surround the outer peripheral surface of the radiant tube 1. A skirt-shaped outer cylinder 4a is provided from near the tip of the helical tube 4b to the outer peripheral surface of the radiant tube 1 with a certain gap therebetween so as to cover the helical tube 4b.
螺ｉｖ：４ｂの後方、ラジアントチューブ１の７ランジ
１ａ近傍の出口は、エアー循環管３に接続し、熱交換伝
熱面を増大させた構造にしている。The outlet near the 7 flange 1a of the radiant tube 1 at the rear of the screw iv: 4b is connected to the air circulation pipe 3, and has a structure in which the heat exchange heat transfer surface is increased.
エアー循環管３は、二次熱交換器とし・て、内面にフィ
ン２ａが取り付けたレキユバレーク２内に挿入されてい
る。The air circulation pipe 3 is inserted as a secondary heat exchanger into a requisite lake 2 having fins 2a attached to its inner surface.
また、第２図は本発明にかかるラジアントチューブ内バ
ーナの燃焼空気予熱装置の他の実施例の概略構成を示す
要部断面図であって、第１図に示すラジアントチューブ
内バーナ燃焼空気予熱装置の螺旋管４ｂの代りに内筒４
ｃを設けた以外は全く第１図の装置と同一の構造をもっ
ている。内筒４Ｃはラジアントチューブ１のフランジ１
ａに固着され、ラジアントチューブ１の外周面と一定の
空間を形成している。そして、内筒４Ｃの後方（前記ラ
ジアントチューブ１のフランジ１ａ側）に出口が設けら
れ、第１図に示す装置同様に二次熱交換器としてのレキ
ュペレータ２に挿入されたエアー循環管３に接続する構
造になっている。Further, FIG. 2 is a sectional view of a main part showing a schematic configuration of another embodiment of the radiant tube burner combustion air preheating device according to the present invention, and is a radiant tube burner combustion air preheating device shown in FIG. 1. Inner cylinder 4 instead of spiral tube 4b
This device has the same structure as the device shown in FIG. 1, except for the provision of the device c. Inner cylinder 4C is flange 1 of radiant tube 1
a, and forms a certain space with the outer peripheral surface of the radiant tube 1. An outlet is provided at the rear of the inner cylinder 4C (on the flange 1a side of the radiant tube 1), and is connected to an air circulation pipe 3 inserted into a recuperator 2 as a secondary heat exchanger, similar to the device shown in FIG. It is structured to do this.
本実施例のラジアントチューブ内バーナの燃焼空気予熱
装置は、フランジ１ａ近傍から吸い込まれたエアーは、
先ずレキュペレータ４の一番外側の外筒４ａを冷却（熱
交換）した後、高温のラジアントチューブ１と熱交換す
るために、螺旋管４ｂ（又は内筒４ｃ）に入り、螺旋管
４ｂ（又は内Ｍ４ｃ）内を流れろことで、エアーはラジ
アントチューブ１と熱交換し加熱されろ。そして、エア
ー循環管３を通り、従来同様のレキュペレータ２に入っ
たエアーは、排ガスと熱交換し、高温になってバーナに
送り込まれる。In the combustion air preheating device for the radiant tube internal burner of this embodiment, the air sucked from the vicinity of the flange 1a is
First, the outermost outer tube 4a of the recuperator 4 is cooled (heat exchanged), and then enters the spiral tube 4b (or inner tube 4c) to exchange heat with the high-temperature radiant tube 1. By flowing through M4c), the air exchanges heat with the radiant tube 1 and is heated. The air that passes through the air circulation pipe 3 and enters the recuperator 2, which is similar to the conventional one, exchanges heat with the exhaust gas, becomes high temperature, and is sent to the burner.
周知のように、対流伝熱での熱の移動ｉＱは次式で与丸
られる。As is well known, the heat transfer iQ in convective heat transfer is given by the following equation.
Ｑ＝αＸＡＸΔＬ
ここで、αは熱伝達率、Ａは伝熱面積、Δｔは温度差を
表わす。Q=αXAXΔL Here, α is the heat transfer coefficient, A is the heat transfer area, and Δt is the temperature difference.
したがってＡが増加するとＱも増加するので本発明のよ
うに伝熱面積が増加すると、熱交換旦が多くなり、空気
温度を高くすることができる。Therefore, when A increases, Q also increases, so when the heat transfer area increases as in the present invention, the number of heat exchange days increases and the air temperature can be increased.
本発明の実施の一例としてフインチのラジアントチュー
ブに１２０． ＯＯＯｋｃｍｌ／ｈｒのバーナを取り付
け、チューブを加熱した場合のテスト結果では、従来の
レキュペレータを用いた場合、バーナに供給する燃焼用
空気は約４００℃まで予加熱されるが、本実施例のラジ
アントチューブ内バーナ燃焼空気予熱装置によれば、約
５５０℃の空気をバーナに供給することができる。この
ようにして、約５％のＭ料を低減することがわかった。As an example of implementing the present invention, a finch radiant tube with a diameter of 120. The test results when a burner of OOOkcml/hr was installed and the tube was heated showed that when using a conventional recuperator, the combustion air supplied to the burner is preheated to about 400°C, but the radiant tube of this example According to the internal burner combustion air preheating device, air at approximately 550° C. can be supplied to the burner. In this way it was found to reduce the M charge by about 5%.
〈発明の効果〉
以上の説明から明らかなように、本発明にかかるラジア
ントチューブ内バーナの燃焼空気予熱装置は、熱交換手
段としてのエアレキュペレータの装着部分のラジアント
チューブ温度を低くすることができるから、バーナバン
クを小さくでき、保守管理が容易となる。<Effects of the Invention> As is clear from the above description, the combustion air preheating device for a burner in a radiant tube according to the present invention can lower the temperature of the radiant tube at the part where the air recuperator as a heat exchange means is attached. Therefore, the burner bank can be made smaller and maintenance management becomes easier.
また、ラジアントチューブ外周と、ラジアントチューブ
内に熱交換手段を設けるようにしているから、バーナに
供給する燃焼空気に対する熱交換能力が上がり、高温変
に加熱することができ実用上の利点が大きい。Further, since the heat exchange means is provided on the outer periphery of the radiant tube and inside the radiant tube, the heat exchange ability for the combustion air supplied to the burner is increased, and the combustion air can be heated to a high temperature, which is a great practical advantage.
第１図は本発明のラジアントチューブ内バーナの燃焼空
気予熱装置の一実施例の概略構成を示す要部断面図、第
２図は本発明のラジアントチューブ内バーナの燃焼空気
予熱装置の他の実施例の概略構成を示す要部断面図、第
３図は従来のラジアントチューブ内バーナの燃焼空気予
熱装置の概略構成を示す要部断面図である。
図面中、
１・・ラジアントチューブ、
２゛ラジアントチユーブ内レキユペレータ、３・・・エ
アー循環管・
４・・ラジアントチューブ外部のレキュペレータ、
４ａ・・外筒、
４ｂ・・螺旋管、
４ｃ・・・内筒、
５・・・ライニング。FIG. 1 is a cross-sectional view of essential parts showing a schematic configuration of one embodiment of the combustion air preheating device for a radiant tube burner according to the present invention, and FIG. 2 is another embodiment of the combustion air preheating device for a radiant tube internal burner according to the present invention. FIG. 3 is a cross-sectional view of a main part showing a schematic structure of a conventional combustion air preheating device for a radiant tube internal burner. In the drawings: 1. Radiant tube, 2. Recuperator inside the radiant tube, 3. Air circulation tube, 4. Recuperator outside the radiant tube, 4a.. Outer cylinder, 4b.. Spiral tube, 4c.. Inner. Tube, 5... lining.
Claims (1)
ラジアントチューブ内には二次熱交換手段を設けると共
に、前記一次熱交換手段および二次熱交換手段間をエア
ー循環管で接続し、ラジアントチューブ内バーナに供給
する空気を一次熱交換手段および二次熱交換手段の順に
流して燃焼排ガスとの熱交換により予熱することを特徴
とするラジアントチューブ内バーナの燃焼空気予熱装置
。A primary heat exchange means is provided on the outer periphery of the radiant tube,
A secondary heat exchange means is provided inside the radiant tube, and an air circulation pipe connects the primary heat exchange means and the secondary heat exchange means, so that the air supplied to the burner inside the radiant tube is transferred between the primary heat exchange means and the secondary heat exchange means. A combustion air preheating device for a burner in a radiant tube, characterized in that the combustion air is preheated by heat exchange with combustion exhaust gas through a heat exchange means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61157875A JPS6315007A (en) | 1986-07-07 | 1986-07-07 | Combustion air preheat device for burner in radiant tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61157875A JPS6315007A (en) | 1986-07-07 | 1986-07-07 | Combustion air preheat device for burner in radiant tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6315007A true JPS6315007A (en) | 1988-01-22 |
Family
ID=15659318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61157875A Pending JPS6315007A (en) | 1986-07-07 | 1986-07-07 | Combustion air preheat device for burner in radiant tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6315007A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020049914A (en) * | 2000-12-20 | 2002-06-26 | 이구택 | apparatus for withdrawing heat in radiant tube of furnace |
| JP2009168309A (en) * | 2008-01-15 | 2009-07-30 | Shoei Seisakusho:Kk | Industrial burner |
| JP2012247082A (en) * | 2011-05-25 | 2012-12-13 | Jfe Steel Corp | Air preheater |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5257551A (en) * | 1975-11-06 | 1977-05-12 | Ishikawajima Harima Heavy Ind Co Ltd | Recuperator for use of radiation pipe |
| JPS62276312A (en) * | 1986-05-23 | 1987-12-01 | Mitsubishi Heavy Ind Ltd | Combustion air preheating device for radiant tube |
-
1986
- 1986-07-07 JP JP61157875A patent/JPS6315007A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5257551A (en) * | 1975-11-06 | 1977-05-12 | Ishikawajima Harima Heavy Ind Co Ltd | Recuperator for use of radiation pipe |
| JPS62276312A (en) * | 1986-05-23 | 1987-12-01 | Mitsubishi Heavy Ind Ltd | Combustion air preheating device for radiant tube |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020049914A (en) * | 2000-12-20 | 2002-06-26 | 이구택 | apparatus for withdrawing heat in radiant tube of furnace |
| JP2009168309A (en) * | 2008-01-15 | 2009-07-30 | Shoei Seisakusho:Kk | Industrial burner |
| JP2012247082A (en) * | 2011-05-25 | 2012-12-13 | Jfe Steel Corp | Air preheater |
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