JP2000240909A - Duct burner and duct burner apparatus - Google Patents
Duct burner and duct burner apparatusInfo
- Publication number
- JP2000240909A JP2000240909A JP11044906A JP4490699A JP2000240909A JP 2000240909 A JP2000240909 A JP 2000240909A JP 11044906 A JP11044906 A JP 11044906A JP 4490699 A JP4490699 A JP 4490699A JP 2000240909 A JP2000240909 A JP 2000240909A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- duct
- fuel gas
- base end
- duct burner
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、いわゆるコージェ
ネレーションシステム等に使用されるダクトバーナおよ
びダクトバーナ装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct burner and a duct burner device used in a so-called cogeneration system or the like.
【０００２】[0002]
【従来の技術】コージェネレーションシステムは、ガス
タービン内の燃焼室で圧縮機によって燃焼用空気と燃料
ガスとを混合して燃焼させ、燃焼で発生した燃焼排ガス
によってガスタービンを駆動し、この駆動により発電機
を駆動させて発電する。ところで、前記タービン排ガス
は約５００〜６００℃と高温のため、ガスタービンの下
流側に廃熱ボイラを設置してタービン排ガスの顕熱を回
収して蒸気を得るとともに、廃熱ボイラの下流にエコノ
マイザを設置して余剰の排ガス顕熱を回収し、前記廃熱
ボイラに供給される水を加熱するようになっている。2. Description of the Related Art In a cogeneration system, combustion air and fuel gas are mixed and burned by a compressor in a combustion chamber in a gas turbine, and the gas turbine is driven by combustion exhaust gas generated by combustion. The generator is driven to generate electricity. Meanwhile, since the turbine exhaust gas has a high temperature of about 500 to 600 ° C., a waste heat boiler is installed downstream of the gas turbine to collect sensible heat of the turbine exhaust gas to obtain steam, and an economizer is provided downstream of the waste heat boiler. Is installed to collect excess sensible heat of the exhaust gas and heat the water supplied to the waste heat boiler.
【０００３】しかしながら、廃熱ボイラから大量の蒸気
を必要とする場合、前記燃焼排ガスの顕熱だけでは十分
な蒸気を発生させることができないため、従来、たとえ
ば、実開平４−１２２９２２号公報で開示されるダクト
バーナ（あるいは追い焚きバーナ）をガスタービンの下
流のダクト内に設置してタービン排ガスを昇温して対処
するようにしている。[0003] However, when a large amount of steam is required from a waste heat boiler, sufficient steam cannot be generated only by the sensible heat of the combustion exhaust gas, so that it is conventionally disclosed, for example, in Japanese Utility Model Laid-Open No. 4-122922. A duct burner (or reburning burner) is installed in a duct downstream of the gas turbine to increase the temperature of turbine exhaust gas.
【０００４】ところで、ガスタービンの燃焼はタービン
ブレードを燃焼室で発生する高温の燃焼ガスから保護す
るために空気比が約２．５〜４の超過剰空気で燃焼され
る。その結果、タービン排ガス中の残存酸素濃度が１２
〜１６％となることから、前記タービン排ガスのみを該
ダクトバーナの燃焼用空気としてバーナ内部に導入して
燃料ガスを燃焼させている。[0004] Incidentally, in the combustion of a gas turbine, in order to protect the turbine blades from high-temperature combustion gas generated in the combustion chamber, combustion is performed with an excess air having an air ratio of about 2.5 to 4. As a result, the residual oxygen concentration in the turbine exhaust gas becomes 12
Therefore, only the turbine exhaust gas is introduced into the burner as combustion air for the duct burner to burn the fuel gas.
【０００５】前記公知のダクトバーナ１は、図３に示す
ように、複数の燃料ガス噴出口３を備えた燃料ガスヘッ
ダ２と、この燃料ガスヘッダ２の対向位置に基端部５ａ
が固定され、基端部５ａから排ガス下流側である先端遊
端部５ｂに向かって拡開し、かつ、基端部５ａから遊端
部５ｂにかけて径が徐々に大径となった複数の排ガス導
入孔６を有する２枚の保炎部材４と、この保炎部材４の
両側端を閉鎖する側板７とから構成されている。As shown in FIG. 3, the known duct burner 1 has a fuel gas header 2 having a plurality of fuel gas outlets 3 and a base end 5 a at a position facing the fuel gas header 2.
Are fixed, the plurality of exhaust gases expand from the base end portion 5a toward the distal free end portion 5b on the downstream side of the exhaust gas, and gradually increase in diameter from the base end portion 5a to the free end portion 5b. It is composed of two flame holding members 4 having an introduction hole 6 and side plates 7 closing both side ends of the flame holding member 4.
【０００６】そして、前記ダクトバーナ１においては、
前記燃料ガスヘッダ２へ燃料ガス供給管８から燃料ガス
を供給して燃料ガス噴出口３から噴出させる一方、酸素
濃度１２〜１６％のタービン排ガスの一部を前記排ガス
導入孔６からバーナ内部Ａに導入して燃焼させる。すな
わち、燃料ガスにタービン排ガスを徐々に混合して燃焼
を完結する、いわゆる緩慢燃焼させるようになってい
る。In the duct burner 1,
Fuel gas is supplied from the fuel gas supply pipe 8 to the fuel gas header 2 and is ejected from the fuel gas outlet 3, and a part of the turbine exhaust gas having an oxygen concentration of 12 to 16% is introduced from the exhaust gas introduction hole 6 into the burner interior A. Introduce and burn. That is, the combustion is completed by gradually mixing the turbine exhaust gas with the fuel gas, that is, so-called slow combustion is performed.
【０００７】[0007]
【発明が解決しようとする課題】前記従来のダクトバー
ナ１においては、前述のように緩慢燃焼を行なうため、
燃焼を完結するためには前記保炎部材４を大型（長尺）
にしなければならず、ダクトバーナ１自体が大型化す
る。また、保炎部材４はタービン排ガス下流に向かって
拡開し、かつ長尺なためダクトバーナ１外周のタービン
排ガス流路が狭まって、ダクトバーナ１の上流側と下流
側との差圧、つまり、圧力損失が大きくなり、最上流側
に設置するガスタービンの出力ロスが発生する可能性が
あるばかりか、緩慢燃焼では火炎が長くなるため、ダク
トバーナ１と廃熱ボイラの壁面までの距離を長く確保し
なければならず、コージェネレーションシステムそのも
のが大型化する。In the conventional duct burner 1, since slow combustion is performed as described above,
To complete the combustion, the flame holding member 4 must be large (long).
And the duct burner 1 itself becomes large. Further, since the flame holding member 4 expands toward the downstream of the turbine exhaust gas and is long, the turbine exhaust gas flow path on the outer periphery of the duct burner 1 is narrowed, and the pressure difference between the upstream side and the downstream side of the duct burner 1, that is, the pressure The loss increases and the output loss of the gas turbine installed on the most upstream side may not only occur, but also the flame becomes longer in slow combustion, so the distance between the duct burner 1 and the wall surface of the waste heat boiler must be long. And the cogeneration system itself becomes larger.
【０００８】また、ダクトバーナ１においては、燃焼用
空気として酸素濃度１２〜１６％のタービン排ガスを用
いるため、通常の燃焼用空気で燃焼させるものに比べて
ＮＯｘの排出量は低くなるが、近年においては、さらな
る低ＮＯｘ化を要求されている。Further, in the duct burner 1, since the turbine exhaust gas having an oxygen concentration of 12 to 16% is used as the combustion air, the emission amount of NOx is lower than that of the combustion using the normal combustion air. Are required to further reduce NOx.
【０００９】さらに、上述した緩慢燃焼は燃料ガス噴出
口から直ちに始まり、火炎の基部から先端部になるに連
れて火炎温度が上昇すると同時に、保炎部材は燃焼が完
結するまで長時間火炎にさらされることになるので、た
とえば遊端部５ｂでは９７０℃の高温となり、例えばイ
ンコネルやハステロイ等の高級材である耐熱鋼を使用し
なければならず、高価になるという問題を有する。そこ
で、本発明者らは、種々検討の結果、ダクトバーナにお
ける局部的な火炎温度の上昇を抑制し、かつ、短炎化す
ることにより前記課題を解決することができることを見
出して本発明に至ったものである。Further, the above-mentioned slow combustion starts immediately from the fuel gas injection port, and the flame temperature rises from the base to the tip of the flame, and the flame holding member is exposed to the flame for a long time until the combustion is completed. For example, the free end portion 5b has a high temperature of 970 ° C., and for example, heat-resistant steel, which is a high-grade material such as Inconel or Hastelloy, must be used. Thus, the present inventors have conducted various studies and found that the above problem can be solved by suppressing a local increase in the flame temperature in the duct burner and shortening the flame, thereby leading to the present invention. Things.
【００１０】[0010]
【課題を解決するための手段】本発明は、前記課題を解
決するために、請求項１では、複数の燃料ガス噴出口を
備えた燃料ガスヘッダと、この燃料ガスヘッダの対向位
置に基端部が固定され、基端部から排ガス下流側に向か
って拡開し、かつ、基端部から先端遊端部にかけて複数
の排ガス導入孔を有する２枚の保炎部材と、この保炎部
材の両側端を閉鎖する側板とからなる排ガスダクト内に
設置されるダクトバーナにおいて、前記保炎部材の長手
方向中央部に最大孔径の排ガス導入孔を配設するととも
に、前記燃料ガスヘッダの燃料ガス噴出口が、前記保炎
部材の基端部側の１列目に配設した排ガス導入孔よりも
前方になるように位置させ、前記保炎部材の基端部側と
中央部の排ガス導入孔から空気比が１．０〜１．６とな
るように排ガスを供給するものである。また、請求項２
では、前記請求項１に記載のダクトバーナをダクト内に
設置したダクトバーナ装置において、前記ダクトバーナ
の保炎部材の遊端部が面するダクト内壁にダクト内の排
ガス流路を絞る差圧調整板を設けたものである。According to the present invention, in order to solve the above-mentioned problems, according to the present invention, a fuel gas header having a plurality of fuel gas ejection ports, and a base end portion at a position opposed to the fuel gas header are provided. Two flame-holding members that are fixed, expand from the base end toward the exhaust gas downstream side, and have a plurality of exhaust gas introduction holes from the base end to the free end of the distal end; In a duct burner installed in an exhaust gas duct consisting of a side plate that closes, an exhaust gas introduction hole having a maximum hole diameter is disposed at a central portion in a longitudinal direction of the flame holding member, and a fuel gas outlet of the fuel gas header is provided with a fuel gas outlet. It is positioned so as to be forward of the exhaust gas introduction holes arranged in the first row on the base end side of the flame holding member, and the air ratio is 1 from the exhaust end holes on the base end side and the center of the flame holding member. The exhaust gas is adjusted so as to be 0.0 to 1.6. It is intended to supply. Claim 2
In the duct burner device in which the duct burner according to claim 1 is installed in a duct, a differential pressure adjusting plate for narrowing an exhaust gas flow path in the duct is provided on an inner wall of the duct facing a free end of a flame holding member of the duct burner. It is a thing.
【００１１】[0011]
【発明の実施の形態】つぎに、本発明の実施の形態を図
にしたがって説明する。本発明にかかるダクトバーナ１
０は、図１，図２に示すように、前記従来のダクトバー
ナ１と同様、先端面に複数の燃料ガス噴出口１２を備
え、両端を閉鎖された断面長方形状の角筒からなる燃料
ガスヘッダ１１と、この燃料ガスヘッダ１１に連通する
燃料ガス供給管１３と、前記燃料ガスヘッダ１１の対向
する両側に基端部１５ａが取り付けられ、多数の排ガス
導入口１６を有するとともに、先端遊端部１５ｂが互い
に拡開するとともに遊端部１５ｂが外側に折曲した屈曲
部１５ｃを有する２枚の保炎部材１４と、この２枚の保
炎部材１４の両端を閉鎖する側板１７とからなる。Next, an embodiment of the present invention will be described with reference to the drawings. Duct burner 1 according to the present invention
Reference numeral 0 denotes a fuel gas header 11 having a plurality of fuel gas outlets 12 at the tip end surface and a rectangular tube having a rectangular cross section closed at both ends, similarly to the conventional duct burner 1 as shown in FIGS. And a fuel gas supply pipe 13 communicating with the fuel gas header 11, and base ends 15a attached to opposite sides of the fuel gas header 11, having a large number of exhaust gas introduction ports 16, and having a free front end 15b connected to each other. It comprises two flame-holding members 14 having a bent portion 15c which is expanded and whose free end 15b is bent outward, and a side plate 17 which closes both ends of the two flame-holding members 14.
【００１２】前記保炎部材１４を更に詳述すると、図２
に示すように、保炎部材１４はその巾方向に３グループ
ａ，ｂ，ｃからなる排ガス導入孔１６ａ〜１６ｅが設け
てある。基端部側である第１グループａの排ガス導入孔
１６ａの面積を１とすると、中央部である第２グループ
ｂを構成する排ガス導入孔１６ｂ，１６ｃの各面積は
２．３３と４．３４、先端部である第３グループｃを構
成する排ガス導入孔１６ｄ，１６ｅの面積は１．０９
で、これらは略千鳥状となるように設けてあり、前記第
１グループａに空気比０．３、第２グループｂに空気比
１．１３、第３グループｃに空気比０．３５のタービン
排ガスを供給するようになっている。The flame holding member 14 will be described in more detail with reference to FIG.
As shown in the figure, the flame holding member 14 is provided with exhaust gas introduction holes 16a to 16e composed of three groups a, b and c in the width direction thereof. Assuming that the area of the exhaust gas introduction holes 16a of the first group a at the base end side is 1, the areas of the exhaust gas introduction holes 16b and 16c constituting the second group b at the center are 2.33 and 4.34. The area of the exhaust gas introduction holes 16d, 16e constituting the third group c, which is the tip, is 1.09.
These are provided so as to be substantially staggered, and the first group a has an air ratio of 0.3, the second group b has an air ratio of 1.13, and the third group c has a turbine having an air ratio of 0.35. It is designed to supply exhaust gas.
【００１３】そして、第１グループａの排ガス導入孔１
６ａは、前記燃料ガスヘッダ１１の燃料ガス噴出口１２
より後方、換言すれば、前記燃料ガス噴出口１２が前記
第１グループａの排ガス導入孔１６ａより前方に位置し
ている。The exhaust gas introduction hole 1 of the first group a
6a is a fuel gas outlet 12 of the fuel gas header 11;
Further behind, in other words, the fuel gas outlet 12 is located forward of the exhaust gas introduction hole 16a of the first group a.
【００１４】ここで、前記構成のダクトバーナ１０をタ
ービン排ガス量：４０００ｍ3Ｎ／ｈ、タービン排ガス
温度：５００℃、残存酸素濃度：１４．７％、燃料ガ
ス：１３Ａ都市ガス、バーナ燃焼容量：８０×１０4ｋ
ｃａｌ／ｈの条件において操業した例について説明す
る。前記ダクトバーナ１０は、図１に示すように、ター
ビン排ガスダクトＴ内の軸芯上に、燃料ガスをタービン
排ガス下流に向かって噴出するように設置する。なお、
１８は差圧調整板である。Here, the duct burner 10 having the above-described structure is used to discharge the turbine exhaust gas amount: 4000 m 3 N / h, the turbine exhaust gas temperature: 500 ° C., the residual oxygen concentration: 14.7%, the fuel gas: 13A city gas, and the burner combustion capacity: 80. × 10 4 k
An example in which operation was performed under the condition of cal / h will be described. As shown in FIG. 1, the duct burner 10 is installed on a shaft in a turbine exhaust gas duct T so as to jet fuel gas downstream of the turbine exhaust gas. In addition,
Reference numeral 18 denotes a differential pressure adjusting plate.
【００１５】そして、前記燃料ガス噴出口１２から燃料
ガスを供給し、図示しない点火装置により点火する。Then, fuel gas is supplied from the fuel gas injection port 12 and ignited by an ignition device (not shown).
【００１６】この場合、前記第１グループａの排ガス導
入孔１６ａから流入するタービン排ガス（燃焼用気体）
は、燃料ガスヘッダ１１の外周に沿って前方に流れ、そ
の間に燃料ガスヘッダ１１を冷却したのち、燃料ガスと
混合し燃焼する。なお、前記排ガス導入孔１６ａから流
入するタービン排ガス（燃焼用気体）は、理論空気量よ
り少ない（空気比ｍ＝０．３）ため、領域Ａでは燃料ガ
スの一部が燃焼することとなる。In this case, turbine exhaust gas (combustion gas) flowing from the exhaust gas introduction hole 16a of the first group a.
Flows forward along the outer periphery of the fuel gas header 11, cools the fuel gas header 11 during that time, mixes with the fuel gas, and burns. Since the turbine exhaust gas (combustion gas) flowing from the exhaust gas introduction hole 16a is smaller than the theoretical air amount (air ratio m = 0.3), a part of the fuel gas is burned in the region A.
【００１７】ついで、第２グループｂの排ガス導入孔１
６ｂ，１６ｃから領域Ｂに流入するタービン排ガス（燃
焼用気体）は理論空気量よりも多い（空気比ｍ＝１．１
３）ため、領域Ｂにおいて前記領域Ａでの残りの燃料ガ
スを燃焼する。つまり、領域Ａ，Ｂで燃料ガスは二段燃
焼を行ないＮＯｘの上昇を抑制する。なお、領域Ｂでの
全空気比は領域Ａからのタービン排ガス（燃焼用気体）
を加えると、空気比ｍ＝１．４３であるため、領域Ｂで
燃焼反応は完結する。Next, the exhaust gas introduction hole 1 of the second group b
The turbine exhaust gas (combustion gas) flowing into the region B from 6b, 16c is larger than the theoretical air amount (air ratio m = 1.1).
3) Therefore, the remaining fuel gas in the area A is burned in the area B. That is, in the regions A and B, the fuel gas performs two-stage combustion and suppresses an increase in NOx. The total air ratio in the region B is the turbine exhaust gas (combustion gas) from the region A.
, The combustion reaction is completed in the region B because the air ratio m is 1.43.
【００１８】また、第３グループｃの排ガス導入孔１６
ｄ，１６ｅからも空気比ｍ＝０．３５のタービン排ガス
（燃焼用気体）が流入するが、前述のように燃焼は領域
Ｂで完結しているため燃焼には何ら寄与せず、火炎温度
よりも低い５００〜６００℃のタービン排ガス（燃焼用
気体）が領域Ｂで形成された燃焼火炎の外周を包囲して
流れるため、ＣＯ等の未燃焼分は生成されず、局部的な
火炎温度の上昇のみを抑制してＮＯｘ低減に寄与すると
ともに保炎部材１４の昇温を防止する。因みに、遊端部
１５ｂの温度を測定したところ７２５℃であった。The exhaust gas introduction holes 16 of the third group c
Turbine exhaust gas (combustion gas) having an air ratio m = 0.35 flows from d and 16e. However, as described above, since combustion is completed in region B, it does not contribute to combustion at all, and does not contribute to combustion. The turbine exhaust gas (combustion gas) at a low temperature of 500 to 600 ° C. flows around the periphery of the combustion flame formed in the region B, so that unburned components such as CO are not generated, and a local increase in the flame temperature is caused. Only to contribute to NOx reduction and prevent the temperature of the flame holding member 14 from rising. Incidentally, when the temperature of the free end portion 15b was measured, it was 725 ° C.
【００１９】前述のように、保炎部材１４のほぼ中央部
に位置する領域Ｂで燃料ガスの燃焼が完結するため、結
果的に前記保炎部材１４の長さＬも従来のもの（２５０
〜３００ｍｍ）に比べて大巾に短くすることができ（１
００〜１３０ｍｍ）、前記８０×１０4ｋｃａｌ／ｈの
燃焼容量で、火炎長さが１．１ｍの短炎燃焼ができる。As described above, since the combustion of the fuel gas is completed in the region B located substantially at the center of the flame holding member 14, the length L of the flame holding member 14 is also reduced to the conventional length (250).
(~ 300 mm).
With a combustion capacity of 80 × 10 4 kcal / h, short flame combustion with a flame length of 1.1 m can be performed.
【００２０】なお、前記排ガス導入口１６から流入する
タービン排ガス（燃焼用気体）量は、ダクトバーナ１０
の上流側と下流側との圧力差により変動する。したがっ
て、ダクトＴの内壁で前記保炎部材１４遊端部１５ｂと
対向する位置に差圧調整板１８を配設して調整するのが
好ましい。この場合、実験によると前記差圧が２０ｍｍ
Ｈ2Ｏ程度になるように調整すれば、最上流側に設置す
るガスタービンの出口ロスを発生させることなく安定燃
焼が確保できることが確かめられた。The amount of turbine exhaust gas (combustion gas) flowing from the exhaust gas inlet 16 is determined by the duct burner 10.
Fluctuates due to the pressure difference between the upstream side and the downstream side. Therefore, it is preferable to arrange the differential pressure adjusting plate 18 at a position on the inner wall of the duct T facing the free end portion 15b of the flame holding member 14 for adjustment. In this case, according to experiments, the differential pressure was 20 mm
It has been confirmed that by adjusting the pressure to about H 2 O, stable combustion can be ensured without generating an outlet loss of the gas turbine installed on the most upstream side.
【００２１】また、前記保炎部材１４の遊端部１５ｂが
外方に屈曲した屈曲部１５ｃが設けてあるため、この近
傍に図に示すように渦流が発生し、この渦流により燃焼
火炎バーナ内に巻き戻して保炎するため、ターンダウン
比を１：１／１０と広くすることができる。Since the free end portion 15b of the flame holding member 14 is provided with a bent portion 15c which is bent outward, a vortex is generated in the vicinity of the bent portion 15c as shown in FIG. In this case, the turndown ratio can be widened to 1/10.
【００２２】前記第１グループａおよび第２グループｂ
から流入するタービン排ガス（燃焼用気体）の合計の空
気比は１．０〜１．６の間となっており、好ましくは、
空気比ｍ＝１．４である。空気比が１．０より低いとバ
ーナ内部（前記領域Ｂ）で燃料過剰となり、煤の発生
や、前記過剰な燃料ガスが前記第３グループｃからのタ
ービン排ガス（燃焼用気体）で燃焼することになり、燃
焼が緩慢となって火炎が伸び過ぎるためである。逆に空
気比が１．６を超えると、燃料ガスとタービン排ガス
（燃焼用気体）との混合過程で過剰のタービン排ガス
（燃焼用気体）が供給されるため、生成する燃焼火炎の
温度が低下してＣＯ等の未燃焼分が発生するからであ
る。The first group a and the second group b
The total air ratio of the turbine exhaust gas (combustion gas) flowing from the air is between 1.0 and 1.6, and preferably,
The air ratio m = 1.4. If the air ratio is lower than 1.0, the fuel becomes excessive inside the burner (the region B), soot is generated, and the excess fuel gas is burned with turbine exhaust gas (combustion gas) from the third group c. This is because the combustion slows down and the flame extends too much. Conversely, when the air ratio exceeds 1.6, excessive turbine exhaust gas (combustion gas) is supplied in the process of mixing the fuel gas and turbine exhaust gas (combustion gas), so that the temperature of the generated combustion flame decreases. This is because unburned components such as CO are generated.
【００２３】さらに、前記両保炎部材１４，１４の開度
αは３５°〜６０°、好ましくは４６．８°である。そ
の理由は開度αが３５°より小さいと、タービン排ガス
の排ガス導入孔１６からの導入量が少なく、逆に６０°
を超えると、導入量が多過ぎて燃料ガスと酸素が急速混
合し、ＮＯｘが増加するからである。Further, the opening degree α of the flame holding members 14, 14 is 35 ° to 60 °, preferably 46.8 °. The reason is that when the opening degree α is smaller than 35 °, the amount of turbine exhaust gas introduced from the exhaust gas introduction hole 16 is small,
This is because, if it exceeds, the introduced amount is too large and the fuel gas and oxygen are rapidly mixed, and NOx increases.
【００２４】本実施の形態では燃料ガスを１３Ａ都市ガ
スについて述べたが、これに限定されることはなく、た
とえば、ブタンガス等の異なる種類の燃料ガスを使用す
るときは、前記第１グループａおよび第２グループｂか
ら流入するタービン排ガス（燃焼用気体）の合計の空気
比を確保するために排ガス導入孔１６の開口率を適宜変
化させればよい。In this embodiment, the fuel gas is described as 13A city gas. However, the present invention is not limited to this. For example, when different types of fuel gas such as butane gas are used, the first group a and the In order to secure the total air ratio of the turbine exhaust gas (combustion gas) flowing from the second group b, the opening ratio of the exhaust gas introduction hole 16 may be appropriately changed.
【００２５】なお、前記説明は、ダクト内に１台のダク
トバーナを設置する場合であるが複数台設置してもよ
い。また、ダクトバーナはタービン排ガスダクトに設置
するものに限らず、たとえば塗装乾燥炉から排出される
残存酸素濃度１８〜１９％の臭気のある排ガスダクト内
の脱臭あるいは熱風発生装置のダクト内に設置してもよ
い。In the above description, one duct burner is installed in the duct, but a plurality of duct burners may be installed. The duct burner is not limited to the one installed in the turbine exhaust gas duct. For example, the duct burner may be installed in the exhaust gas duct having an odor having a residual oxygen concentration of 18 to 19% discharged from the coating drying furnace or installed in the duct of the hot air generator. Is also good.
【００２６】[0026]
【発明の効果】以上の説明で明らかなように、本発明に
よれば、保炎部材の中央部に最大径の排ガス導入孔を設
けて、この領域までで燃焼を完結するようにしたため、
火炎を短炎とすることができ、その結果、保炎部材を従
来のものより短くすることができる。しかも、高温の燃
焼火炎は火炎より低温のタービン排ガスで包囲されるた
め、局部的な火炎温度の上昇を抑制し、ＮＯｘの発生
を、タービン排ガス量：２６３８０ｍ3Ｎ／ｈ、タービ
ン排ガス温度：５６６℃、残存酸素濃度：１３．９１％
の条件である実機設備において４７ｐｐｍと大幅に低減
することができるばかりか、保炎部材も余り昇温せず、
高価な耐熱鋼鈑を使用する必要がなく、ダクトバーナそ
のものを安価なものとすることができる。また、ダクト
内にダクトバーナを設置したダクトバーナ装置において
は、保炎部材遊端部と対向するダクト内面に圧力調整板
を設け、ダクトバーナの上流側と下流側との圧力差を調
整することによりダクトバーナを安定燃焼させることが
できる。As is apparent from the above description, according to the present invention, since the exhaust gas introduction hole having the maximum diameter is provided at the center of the flame holding member, the combustion is completed up to this region.
The flame can be a short flame, and as a result, the flame holding member can be shorter than the conventional one. Moreover, since the high-temperature combustion flame is surrounded by the turbine exhaust gas having a lower temperature than the flame, the local increase in the flame temperature is suppressed, and the generation of NOx is reduced to a turbine exhaust gas amount of 26380 m 3 N / h and a turbine exhaust gas temperature of 566. ° C, residual oxygen concentration: 13.91%
Not only can it be reduced significantly to 47 ppm in the actual equipment that is the condition, but the temperature of the flame holding member does not rise too much,
There is no need to use expensive heat-resistant steel plates, and the duct burner itself can be made inexpensive. In a duct burner device in which a duct burner is installed in a duct, a pressure adjusting plate is provided on the inner surface of the duct facing the free end of the flame holding member, and the duct burner is adjusted by adjusting a pressure difference between an upstream side and a downstream side of the duct burner. Stable combustion is possible.
【図１】 本発明のダクトバーナをダクト内に設置した
状態の断面図。FIG. 1 is a sectional view showing a state in which a duct burner of the present invention is installed in a duct.
【図２】 図１のダクトバーナにおける保炎部材の平面
図。FIG. 2 is a plan view of a flame holding member in the duct burner of FIG. 1;
【図３】 従来のダクトバーナの断面図。FIG. 3 is a sectional view of a conventional duct burner.
１０…ダクトバーナ、１１…燃料ガスヘッダ、１２…燃
料ガス噴出口、１４…保炎板、１５ａ…基端部、１５ｂ
…遊端部、１６（１６ａ，１６ｂ〜１６ｅ）…排ガス導
入口、１７…側板、１８…差圧調整板、Ａ，Ｂ，Ｃ…領
域。DESCRIPTION OF SYMBOLS 10 ... Duct burner, 11 ... Fuel gas header, 12 ... Fuel gas ejection port, 14 ... Flame holding plate, 15a ... Base end part, 15b
... Free end portion, 16 (16a, 16b to 16e) ... Exhaust gas inlet, 17 ... Side plate, 18 ... Differential pressure adjusting plate, A, B, C ... regions.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小倉 啓宏 大阪府大阪市中央区平野町四丁目１番２号 大阪瓦斯株式会社内 (72)発明者 田中 康郎 大阪府大阪市中央区平野町四丁目１番２号 大阪瓦斯株式会社内 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hirohiro Ogura 4-1-2, Hiranocho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Inventor Yasuo Tanaka Hirano-cho, Chuo-ku, Osaka-shi, Osaka 1-2 chome Osaka Gas Co., Ltd.
Claims (2)
ヘッダと、この燃料ガスヘッダの対向位置に基端部が固
定され、基端部から排ガス下流側に向かって拡開し、か
つ、基端部から先端遊端部にかけて複数の排ガス導入孔
を有する２枚の保炎部材と、この保炎部材の両側端を閉
鎖する側板とからなる排ガスダクト内に設置されるダク
トバーナにおいて、 前記保炎部材の長手方向中央部に最大孔径の排ガス導入
孔を配設するとともに、前記燃料ガスヘッダの燃料ガス
噴出口が、前記保炎部材の基端部側の１列目に配設した
排ガス導入孔よりも前方になるように位置させ、前記保
炎部材の基端部側と中央部の排ガス導入孔から空気比が
１．０〜１．６となるように排ガスを供給することを特
徴とするダクトバーナ。1. A fuel gas header having a plurality of fuel gas ejection ports, a base end portion fixed at a position facing the fuel gas header, and expanding from the base end toward the exhaust gas downstream side. A duct burner installed in an exhaust gas duct consisting of two flame holding members having a plurality of exhaust gas introduction holes from a portion to a tip free end and a side plate closing both side ends of the flame holding member; An exhaust gas introduction hole having a maximum hole diameter is provided at a central portion in a longitudinal direction of the fuel gas header, and a fuel gas ejection port of the fuel gas header is arranged to be smaller than an exhaust gas introduction hole arranged in a first row on a base end side of the flame holding member. A duct burner, which is positioned so as to be forward, and supplies exhaust gas from an exhaust gas introduction hole at a base end side and a central portion of the flame holding member so that an air ratio is 1.0 to 1.6.
クト内に設置したダクトバーナ装置において、前記ダク
トバーナの保炎部材の遊端部が面するダクト内壁にダク
ト内の排ガス流路を絞る差圧調整板を設けたことを特徴
とするダクトバーナ装置。2. The duct pressure burner according to claim 1, wherein the duct burner is installed in the duct, and the pressure difference of the exhaust gas in the duct is reduced to the duct inner wall facing the free end of the flame holding member of the duct burner. A duct burner device comprising a plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4490699A JP3001571B1 (en) | 1999-02-23 | 1999-02-23 | Duct burner and duct burner device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4490699A JP3001571B1 (en) | 1999-02-23 | 1999-02-23 | Duct burner and duct burner device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP3001571B1 JP3001571B1 (en) | 2000-01-24 |
| JP2000240909A true JP2000240909A (en) | 2000-09-08 |
Family
ID=12704524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4490699A Expired - Lifetime JP3001571B1 (en) | 1999-02-23 | 1999-02-23 | Duct burner and duct burner device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3001571B1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100820254B1 (en) | 2008-01-10 | 2008-04-08 | 최혁순 | Burner deterioration protector |
| JP2014199009A (en) * | 2013-03-29 | 2014-10-23 | 三浦工業株式会社 | Gas engine cogeneration system |
| JP7404589B1 (en) | 2023-09-19 | 2023-12-25 | 東京瓦斯株式会社 | Hydrogen combustion type duct burner |
| JP7470855B1 (en) | 2023-09-19 | 2024-04-18 | 東京瓦斯株式会社 | Hydrogen-fired duct burner |
-
1999
- 1999-02-23 JP JP4490699A patent/JP3001571B1/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100820254B1 (en) | 2008-01-10 | 2008-04-08 | 최혁순 | Burner deterioration protector |
| JP2014199009A (en) * | 2013-03-29 | 2014-10-23 | 三浦工業株式会社 | Gas engine cogeneration system |
| JP7404589B1 (en) | 2023-09-19 | 2023-12-25 | 東京瓦斯株式会社 | Hydrogen combustion type duct burner |
| JP7470855B1 (en) | 2023-09-19 | 2024-04-18 | 東京瓦斯株式会社 | Hydrogen-fired duct burner |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3001571B1 (en) | 2000-01-24 |
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