JP2810693B2 - Radiant tube - Google Patents
Radiant tubeInfo
- Publication number
- JP2810693B2 JP2810693B2 JP1099399A JP9939989A JP2810693B2 JP 2810693 B2 JP2810693 B2 JP 2810693B2 JP 1099399 A JP1099399 A JP 1099399A JP 9939989 A JP9939989 A JP 9939989A JP 2810693 B2 JP2810693 B2 JP 2810693B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- inner tube
- radiant tube
- radiant
- outer 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 - Lifetime
Links
- 239000003381 stabilizer Substances 0.000 description 10
- 230000005855 radiation Effects 0.000 description 9
- 239000000567 combustion gas Substances 0.000 description 6
- 239000002737 fuel gas Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 102220579497 Macrophage scavenger receptor types I and II_F23C_mutation Human genes 0.000 description 1
- 102220488234 Uromodulin-like 1_F23D_mutation Human genes 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Gas Burners (AREA)
- Combustion Of Fluid Fuel (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はラジアントチューブに関する。Description: TECHNICAL FIELD The present invention relates to a radiant tube.
シングルエンド型のラジアントチューブは、例えばウ
ォーキングビーム方式の加熱炉で使用されている。この
ラジアントチューブは、バーナーと、該バーナーを包囲
する内管と、該内管を包囲する外管とを有している。こ
のラジアントチューブでは、バーナーによりLPG、LNGな
どの燃料ガスに着火して炎を発生させ、燃焼ガスを内管
の開放端から内管と外管との間の間隙を通過させ、外管
から炉内へ熱を輻射することにより加熱を行っている。The single-end type radiant tube is used, for example, in a walking beam type heating furnace. The radiant tube has a burner, an inner tube surrounding the burner, and an outer tube surrounding the inner tube. In this radiant tube, a burner ignites a fuel gas such as LPG, LNG, etc. to generate a flame, the combustion gas passes through the gap between the inner tube and the outer tube from the open end of the inner tube, and the furnace passes from the outer tube to the furnace. Heating is performed by radiating heat into the interior.
前記内管及び外管は、熱伝導率が高く、かつ耐酸化性
に優れているSiC、Si3N4などの材質で構成されている。The inner pipe and the outer pipe are made of a material having high thermal conductivity and excellent oxidation resistance, such as SiC and Si 3 N 4 .
しかし、従来のラジアントチューブでは外管からの輻
射効率を考慮せずに内管及び外管の寸法を設計していた
ため、輻射効率が充分に高いとはいえなかった。However, in the conventional radiant tube, since the dimensions of the inner tube and the outer tube were designed without considering the radiation efficiency from the outer tube, the radiation efficiency was not sufficiently high.
本発明は前記問題点を解決するためになされたもので
あり、外管から輻射効率の高いアジアントチューブを提
供することを目的とする。The present invention has been made to solve the above problems, and has as its object to provide an Asian tube having high radiation efficiency from an outer tube.
本発明のラジアントチューブは、バーナーと、該バー
ナーを包囲する内管と、該内管を包囲する外管とを具備
したラジアントチューブにおいて、長軸方向に垂直な面
で、前記内管−外管間の間隙の断面積に対する前記内部
空間の断面積の比を1.0以下としたことを特徴とするも
のである。The radiant tube of the present invention is a radiant tube including a burner, an inner tube surrounding the burner, and an outer tube surrounding the inner tube. The ratio of the cross-sectional area of the internal space to the cross-sectional area of the gap between them is set to 1.0 or less.
本発明において、内管及び外管を構成する材質として
は、SiC、Si3N4などが挙げられる。このうちでもSi注入
SiC、焼結SiCなどのSiC質材料が好ましい。これは、SiC
質材料は酸化物、窒化物などの他の材料に比べて熱伝導
率が高く、かつ耐酸化性に優れており、内管及び外管と
して用いた場合に他の材料に比べて酸化の度合が少ない
ためである。In the present invention, examples of the material constituting the inner tube and the outer tube include SiC and Si 3 N 4 . Si implantation even among these
SiC materials such as SiC and sintered SiC are preferred. This is SiC
Porous materials have higher thermal conductivity than other materials such as oxides and nitrides, and are superior in oxidation resistance. When used as inner and outer tubes, the degree of oxidation is higher than other materials. Is less.
本発明によれば、内管−外管間の間隙の断面積が内管
内部空間の断面積よりも大きくなっているので、バーナ
ーで燃焼された燃焼ガスは内管内部では流速が速いが、
内管を出て内管−外管間の間隙を通過する時点ではそれ
よりも流速が遅くなっている。したがって、このような
ラジアントチューブでは外管と外部との間の実効的な熱
交換時間が長く、輻射効率が高い。According to the present invention, since the cross-sectional area of the gap between the inner pipe and the outer pipe is larger than the cross-sectional area of the inner pipe internal space, the combustion gas burned by the burner has a high flow velocity inside the inner pipe,
The flow rate is lower at the time when the tube leaves the inner tube and passes through the gap between the inner tube and the outer tube. Therefore, in such a radiant tube, the effective heat exchange time between the outer tube and the outside is long, and the radiation efficiency is high.
以下、本発明の実施例を第１図を参照して説明する。
なお、第１図は本発明に係るラジアントチューブの断面
図である。Hereinafter, an embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a sectional view of a radiant tube according to the present invention.
第１図において、SiC質の外管１の一端には炉壁の外
に配置される排気口２が接続されている。外管１内には
その一端側からSiC質の内管３が挿入されており、内管
３の他端は開放されている。内管３内にはその一端側か
ら保炎器４が挿入され、保炎器４内にはスパークロッド
５が挿入されている。スパークロッド５の先端部にはア
ルミナ碍子６を介して旋回チップ７が取付けられてい
る。保炎器４及びスパークロッド５はバーナー支持部８
に支持されており、バーナー支持部８には燃焼ガス供給
口９及び空気供給口10が設けられている。これら保炎器
４、スパークロッド５、バーナー支持部８などの部材に
よりバーナーが構成されている。以上の各部材からなる
ラジアントチューブは加熱炉の対向する炉壁間に水平に
設置される、 前記構成のラジアントチューブによる加熱は以下のよ
うに行われる。燃料ガスは燃料ガス供給口９から保炎器
４内部を流れ、旋回チップ７を通過して旋回流としてス
パークロッド５の先端部へ供給される。空気は空気供給
口10から保炎器４と内管３との間を流れ、保炎器４に設
けられた流入口4aから保炎器４内部のスパークロッド５
の先端部へ供給される。この時点でスパークロッド５と
保炎器４との間に高電圧を印加すると、スパークロッド
５先端で電気火花が発生し、燃料ガスに着火して内管３
内部で炎が発生する。高温の燃焼ガスは内管３内部、内
管３の開放端、内管３と外管１との間隙を通過して、排
気口２から排気される。燃焼ガスの熱は外管１から加熱
炉内へ輻射され、加熱炉の雰囲気ガスが加熱される。In FIG. 1, an exhaust port 2 arranged outside the furnace wall is connected to one end of an outer tube 1 made of SiC. An inner tube 3 made of SiC is inserted into the outer tube 1 from one end thereof, and the other end of the inner tube 3 is open. A flame stabilizer 4 is inserted into the inner tube 3 from one end thereof, and a spark rod 5 is inserted into the flame stabilizer 4. A turning tip 7 is attached to the tip of the spark rod 5 via an alumina insulator 6. The flame stabilizer 4 and the spark rod 5 are connected to a burner support 8.
The burner support 8 has a combustion gas supply port 9 and an air supply port 10. A member such as the flame stabilizer 4, the spark rod 5, and the burner support 8 constitutes a burner. The radiant tube composed of each of the above members is installed horizontally between opposed furnace walls of the heating furnace. Heating by the radiant tube having the above-described configuration is performed as follows. The fuel gas flows from the fuel gas supply port 9 inside the flame stabilizer 4, passes through the swirl tip 7, and is supplied as a swirling flow to the tip of the spark rod 5. The air flows from the air supply port 10 between the flame stabilizer 4 and the inner tube 3, and flows from an inlet 4 a provided in the flame stabilizer 4 to a spark rod 5 inside the flame stabilizer 4.
Is supplied to the tip portion. At this time, when a high voltage is applied between the spark rod 5 and the flame stabilizer 4, an electric spark is generated at the tip of the spark rod 5, and the fuel gas is ignited and the inner pipe 3
Flames occur inside. The high-temperature combustion gas passes through the inside of the inner pipe 3, the open end of the inner pipe 3, the gap between the inner pipe 3 and the outer pipe 1, and is exhausted from the exhaust port 2. The heat of the combustion gas is radiated from the outer tube 1 into the heating furnace, and the atmosphere gas in the heating furnace is heated.
なお、内管３は第２図に示すように、貫通孔3aを設け
たものを用いてもよい。As shown in FIG. 2, the inner tube 3 may be provided with a through hole 3a.
試験例 第１表に示すような寸法を有する内管（内径r3、外径
r2）及び外管（内径r1）を用い、それぞれ第１図又は第
２図に示すようにラジアントチューブを組立てて、プロ
パンガスを燃料として温度980℃、燃料3kcal/cm2hrとな
るように加熱した。各ラジアントチューブにおける（内
管内部空間の断面石）／（内管−外管間の間隙の断面
積）と比と、輻射効率との関係を第１表に示す。なお、
輻射効率は、内管内部の温度が980℃の時、外管の先端
から500mmの位置での温度を測定することにより評価し
た。Test example Inner tube with dimensions as shown in Table 1 (inner diameter r 3 , outer diameter
r 2 ) and an outer tube (inner diameter r 1 ), assemble a radiant tube as shown in FIG. 1 or FIG. 2, respectively, so that the temperature becomes 980 ° C. and the fuel becomes 3 kcal / cm 2 hr using propane gas as fuel. Heated. Table 1 shows the relationship between the ratio (cross-sectional stone of the inner space of the inner tube) / (cross-sectional area of the gap between the inner tube and the outer tube) and the radiation efficiency in each radiant tube. In addition,
The radiation efficiency was evaluated by measuring the temperature at a position 500 mm from the tip of the outer tube when the temperature inside the inner tube was 980 ° C.
第１表から明らかなように、断面積比が1.0以下のラ
ジアントチューブでは輻射効率が優れていることがわか
る。これは、断面積の比が1.0以下のラジアントチュー
ブでは、燃焼ガスの流速は、内管内部におけるよりも、
内管−外管間の間隙を通過する時点の方が遅くなり、外
管と外部との間の熱交換を充分に行うことができるため
である。 As is evident from Table 1, the radiant tube having a sectional area ratio of 1.0 or less has excellent radiation efficiency. This means that in a radiant tube with a cross-sectional area ratio of 1.0 or less, the flow rate of the combustion gas is higher than in the inner tube.
This is because the time of passing through the gap between the inner tube and the outer tube is later, and the heat exchange between the outer tube and the outside can be sufficiently performed.
また、試料１と試料２とを比較して明らかなように、
貫通孔3aを設けた内管３を用いた場合、輻射効率がより
一層高くなっている。これは、内管３内部で不完全燃焼
した燃料ガスが内管−外管間の間隙で流速が遅くなり、
完全に燃焼するためであると考えられる。In addition, as apparent from a comparison between Sample 1 and Sample 2,
When the inner tube 3 provided with the through hole 3a is used, the radiation efficiency is further increased. This is because the flow rate of the fuel gas incompletely burned inside the inner pipe 3 becomes slow in the gap between the inner pipe and the outer pipe,
It is thought to be due to complete combustion.
以上詳述したように本発明のラジアントチューブによ
れば、輻射効率を大幅に高めることができる。As described in detail above, according to the radiant tube of the present invention, the radiation efficiency can be greatly increased.
第１図は本発明の実施例におけるラジアントチューブの
長手方向に沿う断面図、第２図は本発明の他の実施例に
おけるラジアントチューブの長手方向に沿う断面図であ
る。 １……外管、２……排気口、３……内管、４……保炎
器、５……スパークロッド、６……アルミナ碍子、７…
…旋回チップ、８……バーナー支持部、９……燃料ガス
供給口、10……空気供給口。FIG. 1 is a sectional view taken along the longitudinal direction of a radiant tube according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the longitudinal direction of a radiant tube according to another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Outer tube, 2 ... Exhaust port, 3 ... Inner tube, 4 ... Flame stabilizer, 5 ... Spark rod, 6 ... Alumina insulator, 7 ...
... Swirl tip, 8 ... Burner support, 9 ... Fuel gas supply port, 10 ... Air supply port.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 隆 山形県西置賜郡小国町大字小国町378番 地 東芝セラミックス株式会社小国製造 所内 (72)発明者 酒井 幸文 東京都新宿区西新宿１丁目26番２号 東 芝セラミックス株式会社内 (72)発明者 佐々木 泰実 山形県西置賜郡小国町大字小国町378番 地 東芝セラミックス株式会社小国製造 所内 (56)参考文献 特開 昭60−2815（ＪＰ，Ａ) 特開 昭61−147009（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) F23D 14/12 F23C 3/00──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Tanaka 378, Oguni-machi, Oguni-machi, Oguni-machi, Nishiokitama-gun, Yamagata Prefecture Inside the Oguni Plant of Toshiba Ceramics Co., Ltd. No. 2 Inside Toshiba Ceramics Co., Ltd. (72) Inventor Yasumi Sasaki 378, Oguni-machi, Oguni-machi, Oguni-machi, Nishiokitama-gun, Yamagata Prefecture Inside the Oguni Plant of Toshiba Ceramics Co., Ltd. (56) References JP-A-60-2815 JP-A-61-147009 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) F23D 14/12 F23C 3/00
Claims (1)
と、該内管を包囲する外管とを具備したラジアントチュ
ーブにおいて、長軸方向に垂直な面で、前記内管−外管
間の間隙の断面積に対する前記内管内空間の断面積の比
を1.0以下としたことを特徴とするラジアントチュー
ブ。1. A radiant tube comprising a burner, an inner tube surrounding the burner, and an outer tube surrounding the inner tube, wherein the radiant tube is provided between the inner tube and the outer tube in a plane perpendicular to the long axis direction. A radiant tube, wherein a ratio of a cross-sectional area of the inner tube space to a cross-sectional area of the gap is 1.0 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1099399A JP2810693B2 (en) | 1989-04-19 | 1989-04-19 | Radiant tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1099399A JP2810693B2 (en) | 1989-04-19 | 1989-04-19 | Radiant tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02279907A JPH02279907A (en) | 1990-11-15 |
| JP2810693B2 true JP2810693B2 (en) | 1998-10-15 |
Family
ID=14246419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1099399A Expired - Lifetime JP2810693B2 (en) | 1989-04-19 | 1989-04-19 | Radiant tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2810693B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS602815A (en) * | 1983-06-20 | 1985-01-09 | Toshiba Corp | Radiant tube burner |
| JPS61147009A (en) * | 1984-12-19 | 1986-07-04 | Toshiba Ceramics Co Ltd | Radiant tube |
-
1989
- 1989-04-19 JP JP1099399A patent/JP2810693B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02279907A (en) | 1990-11-15 |
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