JPH0223764B2 - - Google Patents
Info
- Publication number
- JPH0223764B2 JPH0223764B2 JP56115710A JP11571081A JPH0223764B2 JP H0223764 B2 JPH0223764 B2 JP H0223764B2 JP 56115710 A JP56115710 A JP 56115710A JP 11571081 A JP11571081 A JP 11571081A JP H0223764 B2 JPH0223764 B2 JP H0223764B2
- Authority
- JP
- Japan
- Prior art keywords
- supply pipe
- exhaust gas
- air
- fuel
- fuel supply
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 40
- 239000000446 fuel Substances 0.000 claims description 40
- 239000007789 gas Substances 0.000 description 37
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 29
- 238000007664 blowing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 125000006850 spacer group Chemical group 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
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
Description
【発明の詳細な説明】
本発明は排ガス中の窒素酸化物（NOx）を低
減すること等のためにバーナに供給する空気噴出
運動量を利用して燃料排ガスを再循環させる方式
を採つたラジアントチユーブバーナに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radiant tube which employs a method of recirculating fuel exhaust gas by utilizing air jet momentum supplied to a burner in order to reduce nitrogen oxides (NOx) in exhaust gas. Regarding burners.
熱処理炉等の加熱源として使用されるラジアン
トチユーブバーナは、一般に内部が高温度になる
ため窒素酸化物の発生が多い。そこでラジアント
チユーブから排出された燃料排ガスの一部を燃焼
用空気と混合し、これをそのラジアントチユーブ
バーナに再供給して、ラジアントチユーブ内の燃
焼を緩慢化し燃焼温度を下げることにより窒素酸
化物の生成を抑えるようにしたものが例えば特開
昭53−69932号公報よりすでに知られている。こ
の公報に記載された排ガス再循環式バーナは、第
３図に示したように、ラジアントチユーブ燃焼装
置であつて、チユーブａの一端に燃料ノズルｂと
該燃料ノズルｂを取囲む内筒ｃを臨ましめてバー
ナ部ｄとすると共にチユーブａの他端を排気部ｅ
とし、前記内筒ｃと排気部ｅを通路ｆで連通し、
排気部ｅからの燃焼排ガスの一部を１段目燃焼用
空気と共に内筒ｃからチユーブａ内に循環せし
め、かつ内筒ｃの外側より２段目燃焼用空気を前
記再循環燃焼排ガスを取囲むように噴出すること
により窒素酸化物の低減を計つたものであり、第
３図中、ｇは炉壁、ｈは排気部ｅのエゼクタ、ｉ
はエゼクタｈに向けて空気を噴出するノズル、ｊ
は通路ｆに向けて１段目燃焼用空気を噴出するノ
ズル、ｋは２段目燃焼用空気通路である。しかる
にこの排ガス再循環式バーナではノズルｉ，ｊお
よびエゼクタｈ、通路ｆをバーナ部ｄから離れて
別体に設けたものであつたのでノズルｉ，ｊから
１段目燃焼用空気が燃焼排ガス中に噴出すると該
燃焼排ガス中に残つている可燃成分がエゼクタｈ
或いは通路ｆにて燃焼するおそれが高く、特に通
路ｆで燃焼を起こすとその燃焼に伴う体積の急膨
張によつて排ガスを循環できる量が大きく変動す
ることとなるので、窒素酸化物の低減効果が期待
できないばかりかバーナ部ｄにおける燃焼も不安
定になるおそれがある。 Radiant tube burners used as heating sources in heat treatment furnaces and the like generally generate high nitrogen oxides because their internal temperatures are high. Therefore, a part of the fuel exhaust gas discharged from the radiant tube is mixed with combustion air and re-supplied to the radiant tube burner to slow down the combustion in the radiant tube and lower the combustion temperature, thereby reducing nitrogen oxides. A device designed to suppress the generation is already known, for example, from Japanese Patent Laid-Open No. 53-69932. The exhaust gas recirculation burner described in this publication is a radiant tube combustion device, as shown in FIG. 3, and has a fuel nozzle b at one end of the tube a and an inner cylinder c surrounding the fuel nozzle b. The tube is brought together to form the burner part d, and the other end of the tube a is used as the exhaust part e.
and the inner cylinder c and the exhaust part e are connected through a passage f,
A part of the combustion exhaust gas from the exhaust part e is circulated together with the first-stage combustion air from the inner cylinder c into the tube a, and the second-stage combustion air is taken from the outside of the inner cylinder c. This is designed to reduce nitrogen oxides by ejecting the gas in a surrounding manner. In Figure 3, g is the furnace wall, h is the ejector of the exhaust section e, and i is the
is a nozzle that spouts air toward ejector h, j
is a nozzle that spouts first-stage combustion air toward passage f, and k is a second-stage combustion air passage. However, in this exhaust gas recirculation type burner, the nozzles i and j, the ejector h, and the passage f were provided separately from the burner section d, so that the air for the first stage combustion is absorbed into the combustion exhaust gas from the nozzles i and j. When the combustion exhaust gas is ejected into the ejector h, the combustible components remaining in the combustion exhaust gas are
Alternatively, there is a high possibility that combustion will occur in passage f, and especially if combustion occurs in passage f, the amount of exhaust gas that can be circulated will fluctuate greatly due to the rapid expansion of volume accompanying the combustion, so the nitrogen oxide reduction effect Not only can this be not expected, but there is also a risk that combustion in the burner section d may become unstable.
本発明の主たる目的は、上記問題点を解決し、
バーナの燃焼の強弱に応じて燃焼排ガスの再循環
量が自動的にコントロールできるようにすること
にある。 The main purpose of the present invention is to solve the above problems,
The objective is to automatically control the amount of recirculation of combustion exhaust gas depending on the strength of combustion in the burner.
その目的を達成するため本発明の排ガス再循環
式ラジアントチユーブバーナは、先端から燃料を
吹出す直管状の燃料供給管を中心部に設け、該燃
料供給管の外周に空気を供給できる一定の間隙を
有するように同心状に空気供給管を設け、該空気
供給管は前記燃料供給管より少し短かくその外形
先端をテーパ状に先細り形状とし、該空気供給管
の外側に燃焼排ガスを供給できる一定の間隙を有
するように同心状でその先端が前記燃料供給管及
び空気供給管の先まで突出した排ガス供給管を設
けると共に該排ガス供給管の先端に前記燃料供給
管又は空気供給管から吹出した燃料と空気が内径
を狭窄せしめた中心孔に燃焼排ガスを巻込んで貫
流する略々円筒形のバーナタイルを固設したこと
を特徴とするものである。 In order to achieve this purpose, the exhaust gas recirculation type radiant tube burner of the present invention has a straight fuel supply pipe in the center that blows out fuel from the tip, and has a certain gap around the outer periphery of the fuel supply pipe that allows air to be supplied. An air supply pipe is provided concentrically so that the air supply pipe is slightly shorter than the fuel supply pipe and has a tapered outer tip, and has a constant diameter that can supply combustion exhaust gas to the outside of the air supply pipe. An exhaust gas supply pipe is provided which is concentric with a gap and whose tip protrudes to the end of the fuel supply pipe and the air supply pipe, and the fuel blown from the fuel supply pipe or the air supply pipe is provided at the tip of the exhaust gas supply pipe. The burner tile is characterized by a substantially cylindrical burner tile through which combustion exhaust gas flows through a central hole with a narrowed inner diameter.
以下に本発明の実施例を図面と共に説明する。
図において、１は先端から燃料を吹出す直管状の
燃料供給管で、該燃料供給管はこのバーナの中心
部に設けられておりこの燃料供給管には断熱のた
め二重構造となるように外周に熱遮蔽管２が被せ
られている。３はその小間隙に介設されたスペー
サである。しかしてこの燃料供給管１の外周に空
気を供給できる一定の間隙４を有するように同心
状に空気供給管５を設ける。６はその間隙４に介
設したスペーサ、７はこの空気供給管５の基端部
一側に開設された空気導入孔であり、この空気供
給管５は前記燃料供給管１より少し短かくその先
端８はテーパ状に先細り形状としてある。９はそ
の空気供給管５の外周に燃焼排ガスを供給できる
一定の間隙１０を有するように同心状に設けられ
た排ガス供給管でその先端は前記燃料供給管１よ
り先まで突出しておりここにバーナタイル１１が
固設される。バーナタイル１１は耐火物で成形さ
れた略々円筒形のものであるが、詳しくは小径な
る中心孔１１ａの前方に内径がテーパ状に漸次拡
大した錐形中空部１１ｂ、及び、後方に内径が急
拡大したテーパ状の錐形中空部１１ｃが形成され
ている。１２はこの間隙１０に介設されているス
ペーサ、１３はこの排ガス供給管９の基端部に設
けられた横仕切板、１４はこの間隙１０中に縦設
されたパイロツトバーナ、１５，１６はそのパイ
ロツトバーナの燃料入口及び空気入口、１７はこ
の間隙１０と連通した排ガス導入管である。排ガ
ス供給管９の外周にはラジアントチユーブ１９が
同心状に設けられている。そして、空気供給フア
ン（図示せず）から給気管２０へ供給された空気
は前記空気導入孔７を通して前記間隙４に供給さ
れる。なお２３は排ガス導入管１７側と給気管２
０側との仕切をなす縦板、２４は炉壁を示す。 Embodiments of the present invention will be described below with reference to the drawings.
In the figure, 1 is a straight fuel supply pipe that blows out fuel from its tip.The fuel supply pipe is installed in the center of this burner, and the fuel supply pipe has a double structure for heat insulation. A heat shielding tube 2 is placed over the outer periphery. 3 is a spacer interposed in the small gap. An air supply pipe 5 is provided concentrically around the outer periphery of the lever fuel supply pipe 1 so as to have a certain gap 4 through which air can be supplied. 6 is a spacer interposed in the gap 4; 7 is an air introduction hole opened on one side of the base end of the air supply pipe 5; this air supply pipe 5 is slightly shorter than the fuel supply pipe 1; The tip 8 has a tapered shape. Reference numeral 9 denotes an exhaust gas supply pipe that is concentrically provided with a constant gap 10 that can supply combustion exhaust gas around the outer circumference of the air supply pipe 5, and its tip protrudes beyond the fuel supply pipe 1, and a burner is installed here. Tiles 11 are fixed. The burner tile 11 is formed of a refractory material and has a substantially cylindrical shape, but in detail, it has a conical hollow part 11b whose inner diameter gradually increases in a tapered shape in front of a small-diameter central hole 11a, and a conical hollow part 11b whose inner diameter gradually increases in the rear. A rapidly expanding tapered conical hollow portion 11c is formed. 12 is a spacer interposed in this gap 10; 13 is a horizontal partition plate provided at the base end of this exhaust gas supply pipe 9; 14 is a pilot burner vertically installed in this gap 10; 15 and 16 are The fuel inlet and air inlet 17 of the pilot burner are exhaust gas inlet pipes communicating with this gap 10. A radiant tube 19 is provided concentrically around the outer periphery of the exhaust gas supply pipe 9. Air supplied from an air supply fan (not shown) to the air supply pipe 20 is supplied to the gap 4 through the air introduction hole 7. Note that 23 indicates the exhaust gas introduction pipe 17 side and the air supply pipe 2.
A vertical plate 24 forming a partition from the 0 side indicates a furnace wall.
このように構成されたラジアントチユーブバー
ナでは、空気供給管５の先端から吹出した空気が
その周囲の燃焼排ガスを巻き込んでバーナタイル
１１の中心孔１１ａに入る。該空気供給管５は先
端がテーパ状の先細り形状になつていると共に該
バーナタイル１１の中心孔１１ａの前方と後方に
夫々錐形中空部１１ｂ，１１ｃが形成されている
ので、ここに生じるベンチユリー効果により、バ
ーナタイル１１の後部の間隙１０にその空気の吹
出速度に応じた負圧が生じ排ガス導入管１７から
燃焼排ガスをその吹出速度に比例して吸引するこ
とができる。吸引された燃焼排ガスは空気と混合
しこれへさらに燃料供給管１から吹出す燃料が混
合する。しかし燃焼排ガスと空気との混合により
その酸素成分比率がすでに下げられているため燃
料供給管１から吹出す燃料が混合しても急には燃
焼を起こさず該燃料はラジアントチユーブ１９内
にて緩やかに燃焼する。このため燃焼温度は低目
に維持され、窒素酸化物の発生がこれによつて著
しく抑えられる。また、燃料供給管１の先端をバ
ーナタイル１１の中心孔１１ａから少し離して対
向させることによりこの部分の保炎性が改善する
と共に、該燃料供給管１の外周に同心状に設けた
空気供給管を該燃料供給管より少し短かくしかつ
その先端をテーパ状の先細り形状としたことによ
り、燃焼排ガスの再循環量が空気供給管からの空
気吹出速度に自動的に比例コントロールされる。 In the radiant tube burner configured in this manner, air blown from the tip of the air supply pipe 5 entrains surrounding combustion exhaust gas and enters the center hole 11a of the burner tile 11. The air supply pipe 5 has a tapered tip and conical hollow portions 11b and 11c are formed in front and rear of the center hole 11a of the burner tile 11, respectively, so that the ventilate generated therein is As a result, a negative pressure is generated in the gap 10 at the rear of the burner tile 11 in accordance with the blowing speed of the air, and the combustion exhaust gas can be sucked from the exhaust gas introduction pipe 17 in proportion to the blowing speed. The sucked combustion exhaust gas is mixed with air, and the fuel blown out from the fuel supply pipe 1 is further mixed with this. However, since the oxygen component ratio has already been lowered by mixing the combustion exhaust gas and air, even if the fuel blown out from the fuel supply pipe 1 is mixed, combustion does not occur suddenly, and the fuel slowly flows inside the radiant tube 19. burns. As a result, the combustion temperature is kept low, and the generation of nitrogen oxides is thereby significantly suppressed. Furthermore, by arranging the tip of the fuel supply pipe 1 to face the center hole 11a of the burner tile 11 with a slight distance from it, the flame stability of this part is improved. By making the pipe a little shorter than the fuel supply pipe and tapering its tip, the amount of recirculation of the combustion exhaust gas is automatically controlled in proportion to the air blowing speed from the air supply pipe.
なお前記熱遮蔽管２は燃料供給管１内の燃料の
過熱を防止し得る。 Note that the heat shield pipe 2 can prevent the fuel in the fuel supply pipe 1 from overheating.
本発明の排ガス再循環バーナは以上の実施例か
らも明らかなように次に列挙したような効果があ
る。 As is clear from the above embodiments, the exhaust gas recirculation burner of the present invention has the following effects.
(イ) バーナタイルの小径なる中心孔に混合気が貫
流することによつて生じた負圧により燃焼排ガ
スを吸引するので、燃焼排ガスの再循環量はそ
の混合気の運動量の強さ即ち燃焼の強弱に比例
して自動的にコントロールされ常に適切な燃焼
排ガス混合比率を保つて窒素酸化物の発生を最
小限に抑制し得ると共に失火や不完全燃焼を防
止することができる。(b) The combustion exhaust gas is sucked in by the negative pressure generated when the mixture flows through the small diameter center hole of the burner tile, so the amount of recirculation of the combustion exhaust gas is determined by the strength of the momentum of the mixture, that is, the combustion rate. It is automatically controlled in proportion to the strength and weakness to always maintain an appropriate combustion exhaust gas mixture ratio, thereby minimizing the generation of nitrogen oxides and preventing misfires and incomplete combustion.
(ロ) 燃料供給管より空気供給管が短かくなつてい
て、該空気供給管から吹出た空気はその周囲の
燃焼排ガスを巻き込むことにより酸素成分比率
を下げてから燃料供給管から吹出る燃料に混合
するためラジアントチユーブ内で低温度の緩や
かな燃焼が行なわれ窒素酸化物の低減化が一層
顕著になる。(b) The air supply pipe is shorter than the fuel supply pipe, and the air blown out from the air supply pipe lowers the oxygen component ratio by involving surrounding combustion exhaust gas, and then becomes the fuel blown out from the fuel supply pipe. Because of the mixing, slow combustion takes place at a low temperature within the radiant tube, and the reduction in nitrogen oxides becomes even more remarkable.
(ハ) 燃焼排ガス中に未然分が残つていてもその燃
焼はこのバーナ部にて行なわれるので上記再循
環量は安定的に保たれ所期の窒素酸化物低減効
果が達成される。(c) Even if some unused gas remains in the combustion exhaust gas, its combustion is carried out in the burner section, so the amount of recirculation is kept stable and the desired nitrogen oxide reduction effect can be achieved.
第１図は本発明の一実施例を示したラジアント
チユーブバーナの縦断面図、第２図はそのＸ−Ｘ
線断面図である。第３図は従来のラジアントチユ
ーブバーナの縦断面図である。
１…燃料供給管、２…熱遮蔽管、４…間隙、５
…空気供給管、８…先端、９…排ガス供給管、１
０…間隙、１１…バーナタイル、１１ａ…中心
孔、１１ｂ，１１ｃ…錐形中空部、１９…ラジア
ントチユーブ。
Fig. 1 is a longitudinal cross-sectional view of a radiant tube burner showing one embodiment of the present invention, and Fig. 2 is a longitudinal cross-sectional view of the radiant tube burner showing an embodiment of the present invention.
FIG. FIG. 3 is a longitudinal sectional view of a conventional radiant tube burner. 1...Fuel supply pipe, 2...Heat shielding pipe, 4...Gap, 5
...Air supply pipe, 8...Tip, 9...Exhaust gas supply pipe, 1
0...Gap, 11...Burner tile, 11a...Center hole, 11b, 11c...Conical hollow part, 19...Radiant tube.
Claims (1)
中心部に設け、該燃料供給管の外周に空気を供給
できる一定の間隙を有するように同心状に空気供
給管を設け、該空気供給管は前記燃料供給管より
少し短かくその外形先端をテーパ状に先細り形状
とし、該空気供給管の外側に燃焼排ガスを供給で
きる一定の間隙を有するように同心状でその先端
が前記燃料供給管及び空気供給管の先まで突出し
た排ガス供給管を設けると共に該排ガス供給管の
先端に小径なる中心孔の前方と後方に錐形中空部
を形成してなる略々円筒形のバーナタイルを固設
し、前記燃料供給管又は空気供給管から吹出した
燃料と空気が該バーナタイルの中心孔に燃焼排ガ
スを巻込んで貫流するようにしたことを特徴とし
た排ガス再循環式ラジアントチユーブバーナ。 ２ 燃料供給管の外周に熱遮蔽管を設けたことを
特徴とする特許請求の範囲第１項記載の排ガス再
循環式ラジアントチユーブバーナ。[Scope of Claims] 1. A straight fuel supply pipe that blows out fuel from the tip is provided in the center, and air supply pipes are arranged concentrically around the outer periphery of the fuel supply pipe so as to have a certain gap for supplying air. The air supply pipe is slightly shorter than the fuel supply pipe and has a tapered outer end, and the end thereof is concentric with a certain gap that can supply combustion exhaust gas to the outside of the air supply pipe. is provided with an exhaust gas supply pipe that protrudes to the tips of the fuel supply pipe and the air supply pipe, and has conical hollow portions in front and rear of a small diameter central hole at the tip of the exhaust gas supply pipe. An exhaust gas recirculation type radiant characterized in that a burner tile is fixedly installed, and the fuel and air blown from the fuel supply pipe or the air supply pipe flow through the center hole of the burner tile, entraining combustion exhaust gas. Chubuvarna. 2. The exhaust gas recirculation type radiant tube burner according to claim 1, characterized in that a heat shielding tube is provided on the outer periphery of the fuel supply tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56115710A JPS5816108A (en) | 1981-07-23 | 1981-07-23 | Burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56115710A JPS5816108A (en) | 1981-07-23 | 1981-07-23 | Burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5816108A JPS5816108A (en) | 1983-01-29 |
| JPH0223764B2 true JPH0223764B2 (en) | 1990-05-25 |
Family
ID=14669273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56115710A Granted JPS5816108A (en) | 1981-07-23 | 1981-07-23 | Burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5816108A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013185791A (en) * | 2012-03-09 | 2013-09-19 | Osaka Gas Co Ltd | Radiant tube type heating device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE75532T1 (en) * | 1987-03-13 | 1992-05-15 | Bloom Eng Co Inc | LOW NOX PRODUCTION RADIANT TUBE BURNER AND PROCESSES. |
| JPH064171Y2 (en) * | 1987-05-01 | 1994-02-02 | 大同特殊鋼株式会社 | Radiant chives |
| US5092761A (en) * | 1990-11-19 | 1992-03-03 | Exxon Chemical Patents Inc. | Flue gas recirculation for NOx reduction in premix burners |
| JP6125078B1 (en) * | 2016-05-10 | 2017-05-10 | 中外炉工業株式会社 | Radiant tube burner |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4844820A (en) * | 1971-10-06 | 1973-06-27 |
-
1981
- 1981-07-23 JP JP56115710A patent/JPS5816108A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4844820A (en) * | 1971-10-06 | 1973-06-27 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013185791A (en) * | 2012-03-09 | 2013-09-19 | Osaka Gas Co Ltd | Radiant tube type heating device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5816108A (en) | 1983-01-29 |
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