JPS6222723Y2 - - Google Patents
Info
- Publication number
- JPS6222723Y2 JPS6222723Y2 JP5239782U JP5239782U JPS6222723Y2 JP S6222723 Y2 JPS6222723 Y2 JP S6222723Y2 JP 5239782 U JP5239782 U JP 5239782U JP 5239782 U JP5239782 U JP 5239782U JP S6222723 Y2 JPS6222723 Y2 JP S6222723Y2
- Authority
- JP
- Japan
- Prior art keywords
- throttle plate
- exhaust gas
- recirculation
- radiant tube
- inner diameter
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 32
- 239000000446 fuel Substances 0.000 description 5
- 230000003134 recirculating effect Effects 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Gas Burners (AREA)
- Combustion Of Fluid Fuel (AREA)
Description
本考案は燃焼排ガスの一部を自己運動エネルギ
ーにより自己又は隣接するラジアントチユーブの
バーナ部に循環させるようにした燃焼排ガス再循
環式ラジアントチユーブバーナに関するものであ
る。
燃焼排ガスの一部をラジアントチユーブ内に再
循環させて排気ガス中のNOx濃度の低減を図つ
た再循環式ラジアントチユーブバーナとして、例
えば特公昭55−105105号公報に示されるように、
ラジアントチユーブ内における燃焼排ガスの流出
部分を絞つて該燃焼排ガスの排出流路径を小さく
することによりその排出速度を高めると共に、該
排出流路内に一端がバーナ部に接続された再循環
パイプの他端側再循環ガス取出口を臨ませて、排
出速度の高められた燃焼排ガスを再循環パイプ内
を通して前記バーナ部に導くようにしたものが知
られている。
しかし、このような再循環式ラジアントチユー
ブバーナにおいては再循環ガス取出部とその周囲
の流速は同じであり燃焼排ガスの循環量を増大さ
せて排気ガス中のNOx濃度をさらに下げるべく
流路径をさらに小さくしたり燃焼排ガス流出部分
の絞り量を大きくしようとすると、排出の抵抗が
大きくなるためにラジアントチユーブ内のガス圧
力が増大して、バーナ部への燃料或いは燃焼用空
気の導入がスムーズでなくなり、燃焼が不安定に
なるし、また絞り部製作がむづかしくバーナ容量
など使用条件の変更に追従しにくい欠点があつ
た。
本考案はかかる欠点を解消すべく改良されたも
ので、燃焼排ガスの流出部分である排気管路に絞
り板を設けて、該排気管路を絞ると同時に該絞り
板部の流出側に位置する排気管路の内径を絞り板
の内径より大なるようにし、さらに、該絞り板部
の流出側に位置する排気管路の内径と、絞り板の
内径と、再循環パイプの再循環ガス取出口の内径
と、絞り板から再循環ガス取出口までの距離との
相互関係を所定の範囲となるように寸法設定する
ことにより、燃焼排ガスの再循環量を安定かつ増
大させて排気ガス中のNOx濃度のより一層の低
減化を図ると共にバーナ部における燃焼の安定を
も損わないようにしたものである。
以下に本考案の実施例を図面と共に説明する。
第１図は燃焼排ガスの一部を自己循環させるよう
にしたラジアントチユーブバーナの縦断面図であ
り、図において、１は炉壁２を貫挿設置されたＵ
字形のラジアントチユーブ、３は該ラジアントチ
ユーブ１の入口側に挿通して取付けられた燃料供
給ノズル、４は該燃料供給ノズル３と同心状に取
付けられた燃焼用空気供給ノズルで、燃料供給ノ
ズル３にて導かれた燃料と、燃焼用空気供給ノズ
ル４にて導かれた空気とが夫々のノズル先端より
噴射されて混合され、パイロツトバーナ５により
点火燃焼されてラジアントチユーブ１内を貫流す
る。６はラジアントチユーブ１の排気管路、７は
該排気管路６とラジアントチユーブ１の入口側バ
ーナ部とを連通させて設けられる再循環パイプ
で、ラジアントチユーブ１内を貫流してきた燃焼
排ガスの一部が排気管路６から再循環パイプ７を
通つてラジアントチユーブ１の入口側へ導かれ、
ラジアントチユーブ１内を再循環される。
しかして本考案は、排気管路６に該排気管路径
を狭めるリング状の絞り板８を該排気管路６と同
心的に設けると共に、該絞り板８部の流出側に該
絞り板８に対向位置させて前記再循環パイプ７の
一端の再循環ガス取出口９を排気管路６と同心的
に設ける。そして、絞り板８部の流出側に位置す
る排気管路６の内径をd0、絞り板８の内径をd1、
再循環ガス取出口９の内径をd2、絞り板８から再
循環ガス取出口９までの距離をｌとすれば、d0，
d1，d2，ｌの相互関係を、
0.5 ≦d1／d0≦0.9
0.15≦d2／d0≦0.9
0.5 ≦ｌ／d1≦2.0
の範囲となるように寸法設定したものである。
かかる構成において、排気管路６は絞り板８部
でその内径が狭められているために、ラジアント
チユーブ１内を貫流してきた燃焼排ガスは絞り板
８部においてその流出速度が高められてより高い
運動エネルギーを有する。そして絞り板８部の流
出側に位置する排出管路６の内径d0が該絞り板８
の内径d1より大きいことにより絞り板８の流入側
より流出側の方が負圧となり、燃焼排ガス自己の
運動エネルギーにより絞り板８の流入側から流出
The present invention relates to a combustion exhaust gas recirculation type radiant tube burner in which a part of the combustion exhaust gas is circulated to the burner section of the own or adjacent radiant tube using self-kinetic energy. As shown in Japanese Patent Publication No. 55-105105, for example, a recirculation type radiant tube burner that aims to reduce the NOx concentration in the exhaust gas by recirculating a part of the combustion exhaust gas into the radiant tube,
By constricting the outflow portion of the combustion exhaust gas in the radiant tube and reducing the diameter of the exhaust flow path of the combustion exhaust gas, the exhaust speed is increased. It is known to have an end-side recirculation gas outlet facing the combustion exhaust gas and guide the combustion exhaust gas having an increased discharge rate to the burner section through the recirculation pipe. However, in such a recirculation type radiant tube burner, the flow velocity in the recirculation gas take-off part and its surroundings is the same, and the flow path diameter has to be further increased in order to increase the circulation amount of combustion exhaust gas and further reduce the NOx concentration in the exhaust gas. If you try to make the radiant tube smaller or increase the amount of restriction at the combustion exhaust gas outlet, the gas pressure inside the radiant tube will increase due to the increased discharge resistance, making it difficult to smoothly introduce fuel or combustion air into the burner section. However, combustion becomes unstable, and the manufacturing of the throttle part is difficult, making it difficult to follow changes in operating conditions such as burner capacity. The present invention has been improved in order to eliminate such drawbacks, and is provided with a throttle plate in the exhaust pipe line, which is the outflow part of the combustion exhaust gas, and at the same time as restricting the exhaust pipe line, the throttle plate is located on the outflow side of the throttle plate part. The inner diameter of the exhaust pipe is made larger than the inner diameter of the throttle plate, and the inner diameter of the exhaust pipe located on the outflow side of the throttle plate, the inner diameter of the throttle plate, and the recirculation gas outlet of the recirculation pipe are By setting the dimensions so that the relationship between the inner diameter of the diaphragm and the distance from the throttle plate to the recirculation gas outlet falls within a predetermined range, the amount of recirculation of combustion exhaust gas can be stably increased and NOx in the exhaust gas can be reduced. This is intended to further reduce the concentration and not to impair the stability of combustion in the burner section. Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal cross-sectional view of a radiant tube burner that self-circulates a part of the combustion exhaust gas.
3 is a fuel supply nozzle inserted and attached to the inlet side of the radiant tube 1; 4 is a combustion air supply nozzle attached concentrically with the fuel supply nozzle 3; the fuel supply nozzle 3; The fuel introduced by the combustion air supply nozzle 4 and the air introduced by the combustion air supply nozzle 4 are injected from the tips of the respective nozzles, mixed, ignited and burned by the pilot burner 5, and flow through the radiant tube 1. 6 is an exhaust pipe line of the radiant tube 1; 7 is a recirculation pipe provided to communicate the exhaust pipe line 6 with the inlet side burner part of the radiant tube 1; is led from the exhaust line 6 through the recirculation pipe 7 to the inlet side of the radiant tube 1,
It is recirculated within the radiant tube 1. Therefore, in the present invention, a ring-shaped aperture plate 8 for narrowing the diameter of the exhaust pipe is provided in the exhaust pipe 6 concentrically with the exhaust pipe 6, and the aperture plate 8 is provided on the outflow side of the aperture plate 8. A recirculation gas outlet 9 at one end of the recirculation pipe 7 is provided concentrically with the exhaust pipe 6 so as to face each other. The inner diameter of the exhaust pipe 6 located on the outflow side of the throttle plate 8 is d 0 , the inner diameter of the throttle plate 8 is d 1 ,
If the inner diameter of the recirculating gas outlet 9 is d 2 and the distance from the throttle plate 8 to the recirculating gas outlet 9 is l, then d 0 ,
The dimensions are set so that the mutual relationship between d 1 , d 2 , and l is within the range of 0.5 ≦d 1 /d 0 ≦0.9 0.15≦d 2 /d 0 ≦0.9 0.5 ≦l/d 1 ≦2.0. . In this configuration, since the exhaust pipe line 6 has an inner diameter narrowed at the throttle plate 8, the combustion exhaust gas flowing through the radiant tube 1 has an increased outflow velocity at the throttle plate 8 and has a higher motion. Has energy. The inner diameter d 0 of the discharge pipe 6 located on the outflow side of the throttle plate 8 is
Because the inner diameter d is larger than 1 , the pressure on the outflow side of the throttle plate 8 becomes more negative than the inflow side, and the combustion exhaust gas flows out from the inflow side of the throttle plate 8 due to its own kinetic energy.
【表】
この曲線から明らかなように燃焼量の増加とと
もに一般的にNOx濃度が増大する傾向にある
が、本考案のラジアントチユーブバーナC1，
C2，C3の燃焼排ガス中のNOx濃度は循環方式を
とらないラジアントチユーブバーナＡはもとよ
り、従来の再循環方式のラジアントチユーブバー
ナＢに較べて大幅に低い値であつた。
このような結果が得られたのは、主として絞り
板８の内径d1に対して該絞り板８の流出側に位置
する排出管路６の内径d0を大ききくとる（0.5≦
d1／d0≦0.9）ことにより、燃焼排ガスの絞り板
８部における流出がスムーズに行われラジアント
チユーブ１内のガス圧力の増加が抑制され、さら
に、d2／d0値、ｌ／d1値を適宜選択することによ
りラジアントチユーブ１内のガス圧力が増加しな
い範囲で燃焼排ガスの再循環量を増大させること
ができたためと思われる。
尚、第２図に示すように排気管路６の一部を切
離し、内側にセラミツク製のリング状体１０を嵌
込んだ円筒１１を介在させそのフランジ部１２を
互いにボルト１３止めして取外し自在に構成すれ
ば、使用条件の変更による部品の取替えやその部
分の点検或いは修理が容易になし得るようにでき
る。
以上説明したように本考案の燃焼排ガス再循環
式ラジアントチユーブバーナは、燃焼排ガスの排
気管路に絞り板を設けると共に該絞り板部の流出
側に該絞り板に対向位置させて再循環ガス取出口
を設け、排気管路の内径d0と、絞り板の内径d1
と、再循環ガス取出口の内径d2と、絞り板から再
循環ガス取出口までの距離ｌとの相互関係を、
0.5 ≦d1／d0≦0.9
0.15≦d2／d0≦0.9
0.5 ≦ｌ／d1≦2.0
の範囲に設定することにより、燃焼排ガスの再循
環量を増大させて排気ガス中のNOx濃度のより
一層の低減を図れ、しかも、燃焼の安定化も確保
できるという利点を有するものである。[Table] As is clear from this curve, the NOx concentration generally tends to increase as the combustion amount increases.
The concentration of NOx in the C 2 and C 3 combustion exhaust gas was significantly lower than that of radiant tube burner A, which does not use a circulation system, as well as radiant tube burner B, which uses a conventional recirculation system. This result was obtained mainly because the inner diameter d 0 of the discharge pipe 6 located on the outflow side of the aperture plate 8 was made larger than the inner diameter d 1 of the aperture plate 8 (0.5≦
d 1 /d 0 ≦0.9), the combustion exhaust gas flows out smoothly at the 8 parts of the throttle plate, suppressing the increase in gas pressure inside the radiant tube 1, and further reducing the d 2 /d 0 value, l/d This seems to be because by appropriately selecting the value 1 , it was possible to increase the amount of recirculation of the combustion exhaust gas within a range where the gas pressure within the radiant tube 1 did not increase. Incidentally, as shown in FIG. 2, a part of the exhaust pipe 6 is separated, a cylinder 11 with a ceramic ring-shaped body 10 fitted therein is interposed, and the flange portions 12 are fixed to each other with bolts 13 and can be removed. With this configuration, parts can be easily replaced due to changes in usage conditions, and the parts can be inspected or repaired easily. As explained above, the combustion exhaust gas recirculation type radiant tube burner of the present invention is provided with a throttle plate in the exhaust pipe of the combustion exhaust gas, and is positioned opposite to the throttle plate on the outflow side of the throttle plate to collect the recirculated gas. Provide an outlet, with the inner diameter of the exhaust pipe d 0 and the inner diameter of the throttle plate d 1
The correlation between the inner diameter d 2 of the recirculating gas outlet and the distance l from the throttle plate to the recirculating gas outlet is 0.5 ≦d 1 /d 0 ≦0.9 0.15≦d 2 /d 0 ≦0.9 0.5 By setting ≦l/d 1 ≦2.0, the amount of recirculation of combustion exhaust gas can be increased to further reduce the NOx concentration in the exhaust gas, and the advantage is that combustion can be stabilized. It has the following.
第１図は本考案の一実施例を示す縦断面図、第
２図は絞り板の他の実施例を示す縦断面図、第３
図は本考案の実験結果を示すグラフである。
１……ラジアントチユーブ、６……排気管路、
８……絞り板、９……再循環ガス取出口。
Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a longitudinal sectional view showing another embodiment of the aperture plate, and Fig. 3 is a longitudinal sectional view showing another embodiment of the aperture plate.
The figure is a graph showing the experimental results of the present invention. 1...Radiant tube, 6...Exhaust pipe line,
8... Throttle plate, 9... Recirculation gas outlet.
Claims (1)
り自己又は隣接するラジアントチユーブのバーナ
部に循環させるようにした燃焼排ガス再循環式ラ
ジアントチユーブバーナにおいて、燃焼排ガスの
排気管路に該排気管路径を狭める絞り板を設ける
と共に、該絞り板部の流出側に該絞り板に対向位
置させて再循環ガス取出口を設け、前記排気管路
の内径d0と、絞り板の内径d1と、再循環ガス取出
口の内径d2と、絞り板から再循環ガス取出口まで
の距離ｌとの相互関係を、 0.5 ≦d1／d0≦0.9 0.15≦d2／d0≦0.9 0.5 ≦ｌ／d1≦2.0 に設定したことを特徴とするもの。[Scope of Claim for Utility Model Registration] In a combustion exhaust gas recirculation type radiant tube burner in which a part of the combustion exhaust gas is circulated to the burner section of the combustion exhaust gas or an adjacent radiant tube using its own kinetic energy, an exhaust pipe line for the combustion exhaust gas A throttle plate is provided to narrow the diameter of the exhaust pipe, and a recirculation gas outlet is provided on the outflow side of the throttle plate to face the throttle plate, and the inner diameter d 0 of the exhaust pipe is equal to the diameter of the throttle plate. The correlation between the inner diameter d 1 , the inner diameter d 2 of the recirculation gas outlet, and the distance l from the throttle plate to the recirculation gas outlet is 0.5 ≦d 1 /d 0 ≦0.9 0.15≦d 2 /d 0 ≦0.9 0.5 ≦l/d 1 ≦2.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5239782U JPS58154311U (en) | 1982-04-09 | 1982-04-09 | Radiant tube burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5239782U JPS58154311U (en) | 1982-04-09 | 1982-04-09 | Radiant tube burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58154311U JPS58154311U (en) | 1983-10-15 |
| JPS6222723Y2 true JPS6222723Y2 (en) | 1987-06-10 |
Family
ID=30063107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5239782U Granted JPS58154311U (en) | 1982-04-09 | 1982-04-09 | Radiant tube burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58154311U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0290665B2 (en) * | 1987-03-13 | 1995-01-25 | Bloom Engineering Company, Inc., | Low nox radiant tube burner and method |
| JPH064171Y2 (en) * | 1987-05-01 | 1994-02-02 | 大同特殊鋼株式会社 | Radiant chives |
-
1982
- 1982-04-09 JP JP5239782U patent/JPS58154311U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58154311U (en) | 1983-10-15 |
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