JP3897534B2 - Burner nozzle - Google Patents

Burner nozzle Download PDF

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Publication number
JP3897534B2
JP3897534B2 JP2001049667A JP2001049667A JP3897534B2 JP 3897534 B2 JP3897534 B2 JP 3897534B2 JP 2001049667 A JP2001049667 A JP 2001049667A JP 2001049667 A JP2001049667 A JP 2001049667A JP 3897534 B2 JP3897534 B2 JP 3897534B2
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JP
Japan
Prior art keywords
burner nozzle
main body
ring member
nozzle
outer cylinder
Prior art date
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Expired - Fee Related
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JP2001049667A
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Japanese (ja)
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JP2002250509A (en
Inventor
康晴 中馬
五輪磨 天野
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/16Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

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  • Gas Burners (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、例えば、発電用ボイラやガス化炉における燃焼装置のバーナーノズルに関する。
【0002】
【従来の技術】
例えば、発電用ボイラの火炉には燃焼装置が設けられ、燃焼装置には火炉を臨むバーナーノズルが備えられている。例えば、ガス焚きのボイラのバーナーノズルとしては、内筒から一次空気、外筒から二次空気を火炉に送給すると共に燃料ノズルから燃料を火炉に送給し、火炉に所定の状態の火炎を発生させるようになっている。液体燃料焚きのバーナーノズルや微粉炭焚きのバーナーノズルも、燃料が種類が異なるだけで略同様な構成となっている。
【0003】
【発明が解決しようとする課題】
上述したように、バーナーノズルの先端は火炉に晒されることになり、火炎や炉内の輻射熱により高温になってしまう。内筒と外筒との間はリブでつながっているが、バーナーノズルの先端と後端との間には長手方向で温度差が生じ、且つ、内筒は燃料等の流体により冷却される状態になって外筒に対して相対的に温度が低くなり、内筒と外筒との間で温度差が生じる。この温度差のため、バーナーノズルの先端部位は熱応力が発生し、変形や亀裂(クリープ損傷)が発生する虞があった。従って、定期的に点検を行って、変形や亀裂に対する対策または交換を講じる必要がある。
【0004】
本発明は上記状況に鑑みてなされたもので、熱応力に対して損傷が生じにくいバーナーノズルを提供することを目的とする。
【0006】
【課題を解決するための手段】
上記目的を達成するための本発明のバーナーノズルは、内筒と外筒とからなり、内筒と外筒との間にリブを設けたバーナーノズルにおいて、先端部を分割して本体部と二重円環部材とし、二重円環部材を相対的に周方向に移動可能に連結部材により本体部に取り付けたことを特徴とする。
【0007】
また、上記目的を達成するための本発明のバーナーノズルは、内筒と外筒とからなり、内筒と外筒との間にリブを設けたバーナーノズルにおいて、先端部を分割して本体部と二重円環部材とし、更に、二重円環部材を内筒部と外筒部とに分割し、連結部材により内筒部と外筒部とを本体部に取り付けて内筒部と外筒部と本体部とを相対的に周方向に移動可能にして二重円環部材を本体部に取り付けたことを特徴とする。
【0008】
そして、リブを先端から後退させて内筒と外筒との間に設けたことを特徴とする
【0010】
【発明の実施の形態】
以下図面に基づいて本発明の実施形態例を説明する。
【0011】
図1乃至図4に基づいて本発明の第1実施形態例を説明する。図1には本発明の第1実施形態例に係るバーナーノズルを備えた燃焼装置(バーナー)の要部断面、図2にはバーナーノズルの分解斜視、図3にはバーナーノズルの断面、図4にはバーナーノズルの正面を示してある。
【0012】
図1に示すように、ボイラ本体1にはバーナー風箱2が備えられ、バーナー風箱2にはバーナー3が設けられている。火炉4の炉壁5の所定位置には開口6が設けられ、開口6にはバーナー3のバーナーノズル7が臨んで配置されている。バーナー3は内筒としての一次ノズル8と外筒としての二次ノズル9とで構成され、一次ノズル8内には燃料を送給する燃料ノズル20が配置されている。
【0013】
バーナー風箱2内には図示しない送風装置から燃焼用空気が送られ、燃焼用空気は一次ノズル8及び二次ノズル9に送られる。一次ノズル8に送られた燃焼用空気は別途送り込まれる所定の混合気と混合されて燃料ノズル20の先端外周から火炉4内に噴出され、二次ノズル9に送られた燃料用空気は別途送り込まれる所定の混合気と混合されて一次ノズル8の先端外周から火炉4内に噴出される。また、燃料ノズル20の先端からは所定状態の燃料が火炉4内に噴出され、所定状態の火炎を火炉4内に発生させる。
【0014】
図1乃至図3に示すように、バーナー3のバーナーノズル7の周方向には、一次ノズル8と二次ノズル9の間に複数のリブ10が配されている。バーナーノズル7は先端部11が分割されてそれぞれにリブ10が設けられた本体部12と二重環部材13とされ、本体部12と二重環部材13はリブ10の部位で連結されて二重環部材13が相対的に周方向に移動可能となっている。図3に示すように、リブ10の先端10a 側はバーナーノズル7の先端7aから幅T後退して設けられている。尚、図3に点線で示すように、リブ10の先端10a を後退側にU字状部を形成してアールを設けた状態にすることも可能である。
【0015】
図3に示すように、バーナーノズル7の先端部11は、本体部12と二重環部材13とが連結部材としてのボルト14で連結されている。即ち、ボルト14は両端側にねじ部14a,14b が形成され、一方のねじ部14a (図中右側)が本体部12のリブ10の部位に螺合している。ボルト14には二重環部材13のリブ10の部位が貫通し、ボルト14の他方のねじ部14b (図中左側)にナット15が螺合して本体部12と二重環部材13とが連結されている
【0019】
二重環部材13のボルト14が貫通する貫通穴17はボルト14の径より大径に形成され、連結時であっても本体部12に対して二重環部材13が相対的に周方向に移動可能となっている。図中の符号で14c は、ボルト14を本体部12に螺合する際に工具を嵌合させるために使用する工具掛部である。尚、ボルト14を予め本体部12に固定したスタットボルトとしてもよく、六角ボルト等頭部付きのボルトを用いてもよい。
【0020】
図4に示すように、バーナーノズル7の先端部11の二重環部材13の内周(内側)には多数の放熱フィン16が設けられ、一次ノズル8側の放熱フィン16と二次ノズル9側の放熱フィン16とは、周方向で位相をずらして形成されている。放熱フィン16により、例えば、温度が40度から50度低下するようになっている。
【0021】
上記構成のバーナーノズル7は、先端部11を分割して本体部12と二重環部材13とし、二重環部材13を相対的に周方向に移動可能にボルト14で本体部12に取り付けたので、先端部11が高温になって本体部12との間に温度差が生じた場合、本体部12に対して二重環部材13が周方向に膨張して移動し、熱膨張差を吸収することができ、発生応力が小さくなって変形や亀裂の発生が抑制されて熱応力による損傷(クリープ損傷)を防止することができる。
【0022】
また、二重環部材13のリブ10の先端10a をバーナーノズル7の先端部7aから後退させたので、応力発生位置が低温側に移動してリブ10の取り付け部が高温に晒されることが抑制され、二重環部材13とリブ10との結合部の熱応力による損傷が抑制される。また、二重環部材13の内側に放熱フィン16を設けたので、放熱によりバーナーノズル7の先端部の温度が低下し、熱応力を低減することができる。
【0023】
このため、バーナーノズル7の変形及び亀裂の発生が防止されて長寿命化を図ることが可能になり、バーナーノズル7が損傷した場合であっても、二重環部材13を交換することで対処することができる。
【0024】
上述した実施形態例では、リブ10を設けたバーナーノズル7を例に挙げて説明したが、リブ10を省略することも可能である。また、先端部11を分割することなく、一体構造のバーナーノズルにおいてリブ10を設けてバーナーノズルの温度を低下させて変形や亀裂を抑制するようにしてもよい。
【0025】
図5、図6に基づいて本発明の第2実施形態例を説明する。図5には本発明の第2実施形態例に係るバーナーノズルの分解斜視、図6にはバーナーノズルの断面を示してある。尚、図5、図6は第1実施形態例の図2及び図3に相当するものであり、第1実施形態例のバーナーノズル7が本実施形態例におけるバーナーノズル21に相当する。このため、第1実施形態例と同一部材には同一符号を付してバーナーの全体構成の説明及び重複する説明は省略してある。
【0026】
図5、図6に示すように、バーナーノズル21の周方向には、一次ノズル8と二次ノズル9の間に複数のリブ10が配されている。バーナーノズル21は先端部22が分割されてそれぞれにリブ10が設けられた本体部23と二重環部材24とされ、二重環部材24は一次ノズル8を形成する内筒部25と二次ノズル9を形成する外筒部26とに分割されている。本体部23と二重環部材24とは連結部材としてのボルト14で連結され、内筒部25と外筒部26と本体部23とは相対的に周方向に移動可能にされている。
【0027】
即ち、ボルト14は両端側にねじ部14a,14b が形成され、一方のねじ部14a (図中右側)が本体部23のリブ10の部位に螺合している。ボルト14には二重環部材24の内筒部25及び外筒部26のリブ10の部位25a,26a が貫通し、ボルト14の他方のねじ部14b (図中左側)にナット15が螺合して本体部23と内筒部25及び外筒部26からなる二重環部材24とが連結されている。内筒部25及び外筒部26の部位25a,26a の貫通穴25b,26b はボルト14の径より大径に形成され、連結時であっても本体部12に対して内筒部25及び外筒部26が個別に相対的に周方向に移動可能となっている。
【0028】
尚、内筒部25の外側及び外筒部26の内側に、即ち、二重環部材24の内周(内側)に多数の放熱フィン16(図4参照)を設けることも可能で、放熱フィン16により、バーナーノズル21の先端部22の温度を、例えば、40度から50度低下させるようにすることもできる。
【0029】
上記構成のバーナーノズル21は、先端部22を分割して本体部23と二重環部材24とし、更に、二重環部材24を内筒部25と外筒部26とに分割し、内筒部25及び外筒部26からなる二重環部材24を相対的に周方向に移動可能にボルト14で本体部23に取り付けたので、先端部22が高温になって本体部12との間に温度差が生じた場合、及び、先端部22の一次ノズル8側と二次ノズル9側との間に温度差が生じた場合、本体部23に対して内筒部25と外筒部26が周方向に個別に膨張して移動して二重環部材24が周方向に移動し、熱膨張差を吸収することができ、発生応力が小さくなって変形や亀裂の発生が抑制されて熱応力による損傷を防止することができる。
【0030】
このため、バーナーノズル21の変形及び亀裂の発生が防止されて長寿命化を図ることが可能になり、バーナーノズル21が損傷した場合であっても、内筒部25及び外筒部26を個別に交換すること、もしくは、内筒部25及び外筒部26からなる二重環部材24を交換することで対処することができる。
【0031】
本発明は、ガス燃料焚き、液体燃料焚き、微粉炭焚きの燃焼装置や、ガス化炉における燃焼装置のバーナーノズルに適用することが可能である。
【0032】
【発明の効果】
バーナーノズルは、内筒と外筒とからなるバーナーノズルにおいて、先端部を分割して本体部と二重環部材とし、二重環部材を相対的に周方向に移動可能に連結部材により本体部に取り付けたので、先端部が高温になって本体部との間に温度差が生じた場合、本体部に対して二重環部材が膨張して周方向に移動し、熱膨張差を吸収することができ、発生応力が小さくなって変形や亀裂の発生が抑制されて熱応力による損傷を防止することができる。この結果、熱応力に対して損傷が生じにくいバーナーノズルとすることが可能になる。
【0033】
また、本発明のバーナーノズルは、内筒と外筒とからなり、内筒と外筒との間にリブを設けたバーナーノズルにおいて、先端部を分割して本体部と二重環部材とし、二重環部材を相対的に周方向に移動可能に連結部材により本体部に取り付けたので、先端部が高温になって本体部との間に温度差が生じた場合、本体部に対して二重環部材が膨張して周方向に移動し、熱膨張差を吸収することができ、発生応力が小さくなって変形や亀裂の発生が抑制されて熱応力による損傷を防止することができる。この結果、熱応力に対して損傷が生じにくいバーナーノズルとすることが可能になる。
【0034】
また、本発明のバーナーノズルは、内筒と外筒とからなり、内筒と外筒との間にリブを設けたバーナーノズルにおいて、先端部を分割して本体部と二重環部材とし、更に、二重環部材を内筒部と外筒部とに分割し、連結部材により内筒部と外筒部とを本体部に取り付けて内筒部と外筒部と本体部とを相対的に周方向に移動可能にして二重環部材を本体部に取り付けたので、先端部が高温になって本体部との間に温度差が生じた場合、及び、先端部の内筒側と外筒側との間に温度差が生じた場合、本体部に対して内筒部と外筒部が周方向に個別に膨張して移動して二重環部材が周方向に移動し、熱膨張差を吸収することができ、発生応力が小さくなって変形や亀裂の発生が抑制されて熱応力による損傷を防止することができる。この結果、熱応力に対して損傷が生じにくいバーナーノズルとすることが可能になる。
【0035】
また、バーナーノズルは、内筒と外筒とからなるバーナーノズルにおいて、先端部の内筒の外側及び外筒の内側にそれぞれ放熱フィンを設けたので、先端部が高温になった場合、放熱フィンにより温度を低下させて発生応力が小さくなって変形や亀裂の発生が抑制されて熱応力による損傷を防止することができる。この結果、熱応力に対して損傷が生じにくいバーナーノズルとすることが可能になる。
【図面の簡単な説明】
【図1】本発明の第1実施形態例に係るバーナーノズルを備えた燃焼装置(バーナー)の要部断面図。
【図2】バーナーノズルの分解斜視図。
【図3】バーナーノズルの断面図。
【図4】バーナーノズルの正面図。
【図5】本発明の第2実施形態例に係るバーナーノズルの分解斜視図。
【図6】バーナーノズルの断面図。
【符号の説明】
1 ボイラ本体
2 バーナー風箱
3 バーナー
4 火炉
5 炉壁
6 開口
7,21 バーナーノズル
7a 先端
8 一次ノズル
9 二次ノズル
10 リブ
10a 先端
11,22 先端部
12,23 本体部
13,24 二重環部材
14 ボルト
14a,14b ねじ部
15 ナット
16 放熱フィン
17,25b,26b 貫通穴
25 内筒部
25a 部位
26 外筒部
26a 部位
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a burner nozzle of a combustion apparatus in a power generation boiler or a gasification furnace, for example.
[0002]
[Prior art]
For example, a combustion apparatus is provided in a furnace of a power generation boiler, and the combustion apparatus is provided with a burner nozzle that faces the furnace. For example, as a burner nozzle for a gas-fired boiler, primary air from the inner cylinder and secondary air from the outer cylinder are supplied to the furnace and fuel is supplied from the fuel nozzle to the furnace, and a flame in a predetermined state is supplied to the furnace. It is supposed to be generated. The liquid fuel-fired burner nozzle and the pulverized coal-fired burner nozzle have substantially the same configuration except that the types of fuel are different.
[0003]
[Problems to be solved by the invention]
As described above, the tip of the burner nozzle is exposed to the furnace and becomes high temperature due to the flame and radiant heat in the furnace. The inner cylinder and the outer cylinder are connected by a rib, but a temperature difference occurs in the longitudinal direction between the front and rear ends of the burner nozzle, and the inner cylinder is cooled by a fluid such as fuel. Thus, the temperature is relatively low with respect to the outer cylinder, and a temperature difference is generated between the inner cylinder and the outer cylinder. Due to this temperature difference, thermal stress is generated at the tip of the burner nozzle, which may cause deformation or cracking (creep damage). Therefore, it is necessary to periodically inspect and take countermeasures or replacement for deformations and cracks.
[0004]
The present invention has been made in view of the above situation, and an object thereof is to provide a burner nozzle that is less likely to be damaged by thermal stress.
[0006]
[Means for Solving the Problems]
In order to achieve the above object , a burner nozzle according to the present invention comprises an inner cylinder and an outer cylinder. In the burner nozzle having a rib between the inner cylinder and the outer cylinder, the tip portion is divided into two parts. A double ring member is provided, and the double ring member is attached to the main body by a connecting member so as to be relatively movable in the circumferential direction.
[0007]
Further, a burner nozzle of the present invention for achieving the above object is a burner nozzle comprising an inner cylinder and an outer cylinder, and a rib is provided between the inner cylinder and the outer cylinder. The double annular member is further divided into an inner cylindrical portion and an outer cylindrical portion, and the inner cylindrical portion and the outer cylindrical portion are attached to the main body portion by the connecting member, and the inner cylindrical portion and the outer cylindrical portion are attached. The double annular member is attached to the main body so that the cylindrical portion and the main body can be moved relative to each other in the circumferential direction.
[0008]
And it is characterized in that the rib is retracted from the tip and provided between the inner cylinder and the outer cylinder .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
A first embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view of a main part of a combustion apparatus (burner) including a burner nozzle according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the burner nozzle, FIG. 3 is a cross-section of the burner nozzle, and FIG. Shows the front of the burner nozzle.
[0012]
As shown in FIG. 1, the boiler main body 1 is provided with a burner wind box 2, and the burner wind box 2 is provided with a burner 3. An opening 6 is provided at a predetermined position of the furnace wall 5 of the furnace 4, and a burner nozzle 7 of the burner 3 is disposed in the opening 6. The burner 3 includes a primary nozzle 8 as an inner cylinder and a secondary nozzle 9 as an outer cylinder, and a fuel nozzle 20 for supplying fuel is disposed in the primary nozzle 8.
[0013]
Combustion air is sent into the burner wind box 2 from a blower (not shown), and the combustion air is sent to the primary nozzle 8 and the secondary nozzle 9. Combustion air sent to the primary nozzle 8 is mixed with a predetermined air- fuel mixture that is sent separately, and is injected into the furnace 4 from the outer periphery of the tip of the fuel nozzle 20 , and the fuel air sent to the secondary nozzle 9 is sent separately. Is mixed with a predetermined air-fuel mixture to be ejected from the outer periphery of the tip of the primary nozzle 8 into the furnace 4. Further, fuel in a predetermined state is ejected from the tip of the fuel nozzle 20 into the furnace 4, and a flame in a predetermined state is generated in the furnace 4.
[0014]
As shown in FIGS. 1 to 3, a plurality of ribs 10 are arranged between the primary nozzle 8 and the secondary nozzle 9 in the circumferential direction of the burner nozzle 7 of the burner 3. Burner nozzle 7 is the main body portion 12 which the rib 10 is provided on each distal end portion 11 is divided and the double ring member 13, the body portion 12 and the double chain member 13 is connected at the site of the rib 10 two The heavy ring member 13 is relatively movable in the circumferential direction. As shown in FIG. 3, the tip 10 a side of the rib 10 is provided so as to recede by a width T from the tip 7 a of the burner nozzle 7. In addition, as shown by a dotted line in FIG. 3 , it is also possible to form a U shape by forming a U-shaped portion on the tip side 10a of the rib 10 on the backward side.
[0015]
As shown in FIG. 3, the front end portion 11 of the burner nozzle 7 is connected to a main body portion 12 and a double ring member 13 with a bolt 14 as a connecting member. That is, the bolt 14 is formed with screw portions 14a and 14b at both ends, and one screw portion 14a (right side in the figure) is screwed into the rib 10 portion of the main body portion 12. A portion of the rib 10 of the double ring member 13 passes through the bolt 14, and a nut 15 is screwed into the other screw portion 14 b (left side in the figure) of the bolt 14, so that the main body portion 12 and the double ring member 13 are connected. It is connected .
[0019]
The through hole 17 through which the bolt 14 of the double ring member 13 passes is formed to have a larger diameter than the diameter of the bolt 14, and the double ring member 13 is relatively circumferential with respect to the main body 12 even when connected. It is movable. Reference numeral 14c in the figure denotes a tool hook used for fitting a tool when the bolt 14 is screwed into the main body 12. In addition, it is good also as a stat bolt which fixed the volt | bolt 14 to the main-body part 12 previously, and you may use volt | bolts with heads, such as a hexagon bolt.
[0020]
As shown in FIG. 4, a large number of heat radiation fins 16 are provided on the inner periphery (inner side) of the double ring member 13 at the tip 11 of the burner nozzle 7, and the heat radiation fins 16 and the secondary nozzles 9 on the primary nozzle 8 side. The side heat dissipating fins 16 are formed with a phase shifted in the circumferential direction. For example, the heat radiating fins 16 reduce the temperature from 40 degrees to 50 degrees.
[0021]
The burner nozzle 7 having the above-described configuration is obtained by dividing the tip portion 11 into a main body portion 12 and a double ring member 13, and the double ring member 13 is attached to the main body portion 12 with bolts 14 so as to be relatively movable in the circumferential direction. Therefore, when the tip part 11 becomes high temperature and a temperature difference occurs between the main body part 12, the double ring member 13 expands and moves in the circumferential direction with respect to the main body part 12, and absorbs the thermal expansion difference. It is possible to reduce the generation stress and suppress the occurrence of deformation and cracking, thereby preventing damage (creep damage) due to thermal stress.
[0022]
Further, since the tip 10a of the rib 10 of the double ring member 13 is retracted from the tip 7a of the burner nozzle 7, the stress generation position is prevented from moving to the low temperature side and the attachment portion of the rib 10 is prevented from being exposed to high temperature. Thus, damage due to thermal stress at the joint between the double ring member 13 and the rib 10 is suppressed. Moreover, since the radiation fin 16 is provided inside the double ring member 13, the temperature at the tip of the burner nozzle 7 is lowered by heat radiation, and thermal stress can be reduced.
[0023]
For this reason, deformation and cracking of the burner nozzle 7 can be prevented and the life can be extended, and even if the burner nozzle 7 is damaged, the double ring member 13 is replaced to cope with it. can do.
[0024]
In the embodiment described above, the burner nozzle 7 provided with the rib 10 has been described as an example. However, the rib 10 may be omitted. Further, the ribs 10 may be provided in the integrally structured burner nozzle without dividing the tip portion 11 so as to reduce the temperature of the burner nozzle to suppress deformation and cracking.
[0025]
A second embodiment of the present invention will be described with reference to FIGS. FIG. 5 shows an exploded perspective view of the burner nozzle according to the second embodiment of the present invention, and FIG. 6 shows a cross section of the burner nozzle. 5 and 6 correspond to FIGS. 2 and 3 of the first embodiment, and the burner nozzle 7 of the first embodiment corresponds to the burner nozzle 21 of the present embodiment. For this reason, the same members as those in the first embodiment are denoted by the same reference numerals, and the description of the overall configuration of the burner and the overlapping description are omitted.
[0026]
As shown in FIGS. 5 and 6, a plurality of ribs 10 are arranged between the primary nozzle 8 and the secondary nozzle 9 in the circumferential direction of the burner nozzle 21. The burner nozzle 21 is divided into a main body portion 23 and a double ring member 24 each having a rib 10 provided on a front end portion 22, and the double ring member 24 includes an inner cylinder portion 25 that forms the primary nozzle 8 and a secondary ring member 24. It is divided into an outer cylinder portion 26 that forms the nozzle 9. The main body portion 23 and the double ring member 24 are connected by a bolt 14 as a connecting member, and the inner cylinder portion 25, the outer cylinder portion 26, and the main body portion 23 are relatively movable in the circumferential direction.
[0027]
That is, the bolt 14 is formed with screw portions 14a and 14b on both ends, and one screw portion 14a (the right side in the figure) is screwed into the rib 10 portion of the main body portion 23. Bolts 14 pass through portions 25a and 26a of rib 10 of inner ring portion 24 and outer tube portion 26 of double ring member 24, and nut 15 is screwed into the other screw portion 14b (left side in the figure) of bolt 14. Thus, the main body portion 23 and the double ring member 24 including the inner cylinder portion 25 and the outer cylinder portion 26 are connected. The through holes 25b and 26b of the portions 25a and 26a of the inner cylinder part 25 and the outer cylinder part 26 are formed to have a diameter larger than the diameter of the bolt 14, and the inner cylinder part 25 and the outer part with respect to the main body part 12 even when connected. The cylindrical part 26 can move in the circumferential direction relatively individually.
[0028]
It is also possible to provide a large number of radiating fins 16 (see FIG. 4) on the outer side of the inner cylinder part 25 and the inner side of the outer cylinder part 26, that is, on the inner periphery (inner side) of the double ring member 24. 16, the temperature of the tip 22 of the burner nozzle 21 can be lowered, for example, from 40 degrees to 50 degrees.
[0029]
The burner nozzle 21 configured as described above divides the tip 22 into a main body 23 and a double ring member 24, and further divides the double ring member 24 into an inner cylinder 25 and an outer cylinder 26. Since the double ring member 24 composed of the portion 25 and the outer cylinder portion 26 is attached to the main body portion 23 with the bolts 14 so as to be relatively movable in the circumferential direction, the distal end portion 22 becomes hot and between the main body portion 12 and When a temperature difference occurs, and when a temperature difference occurs between the primary nozzle 8 side and the secondary nozzle 9 side of the tip 22, the inner cylinder part 25 and the outer cylinder part 26 are connected to the main body part 23. The double ring member 24 moves in the circumferential direction by individually expanding and moving in the circumferential direction, can absorb the difference in thermal expansion, the generated stress is reduced, and the occurrence of deformation and cracking is suppressed, and the thermal stress Can prevent damage.
[0030]
For this reason, deformation and cracking of the burner nozzle 21 can be prevented and the life can be extended, and even if the burner nozzle 21 is damaged, the inner cylinder part 25 and the outer cylinder part 26 are individually connected. This can be dealt with by exchanging them or by exchanging the double ring member 24 composed of the inner cylinder part 25 and the outer cylinder part 26.
[0031]
The present invention can be applied to a gas fuel-fired, liquid fuel-fired, pulverized coal-fired combustion apparatus, or a burner nozzle of a combustion apparatus in a gasification furnace.
[0032]
【The invention's effect】
The burner nozzle is a burner nozzle composed of an inner cylinder and an outer cylinder, and the tip portion is divided into a main body portion and a double ring member, and the double ring member is relatively movable in the circumferential direction. When the tip part becomes hot and a temperature difference occurs between the main body part and the double ring member expands relative to the main body part and moves in the circumferential direction, the thermal expansion difference is absorbed. The generated stress is reduced and the occurrence of deformation and cracking is suppressed, so that damage due to thermal stress can be prevented. As a result, it is possible to obtain a burner nozzle that is less likely to be damaged by thermal stress.
[0033]
Further, the burner nozzle of the present invention comprises an inner cylinder and an outer cylinder, and in the burner nozzle provided with a rib between the inner cylinder and the outer cylinder, the tip portion is divided into a main body portion and a double ring member, Since the double ring member is attached to the main body portion by the connecting member so as to be relatively movable in the circumferential direction, when the tip portion becomes hot and a temperature difference occurs between the main body portion and the double ring member, The multi-ring member expands and moves in the circumferential direction, and can absorb the difference in thermal expansion. The generated stress is reduced, the deformation and cracks are suppressed, and damage due to the thermal stress can be prevented. As a result, it is possible to obtain a burner nozzle that is less likely to be damaged by thermal stress.
[0034]
Further, the burner nozzle of the present invention comprises an inner cylinder and an outer cylinder, and in the burner nozzle provided with a rib between the inner cylinder and the outer cylinder, the tip portion is divided into a main body portion and a double ring member, Further, the double ring member is divided into an inner cylinder part and an outer cylinder part, and the inner cylinder part and the outer cylinder part are attached to the main body part by the connecting member, and the inner cylinder part, the outer cylinder part, and the main body part are relative to each other. Since the double ring member is attached to the main body so that it can move in the circumferential direction, if the tip becomes hot and a temperature difference occurs between the main body and the outer cylinder side of the tip When a temperature difference occurs between the cylinder and the cylinder, the inner cylinder and the outer cylinder are individually expanded and moved in the circumferential direction with respect to the main body, and the double ring member is moved in the circumferential direction. The difference can be absorbed, the generated stress is reduced, and the occurrence of deformation and cracking is suppressed, so that damage due to thermal stress can be prevented. As a result, it is possible to obtain a burner nozzle that is less likely to be damaged by thermal stress.
[0035]
The burner nozzle is a burner nozzle composed of an inner cylinder and an outer cylinder. Since the radiating fins are provided on the outer side of the inner cylinder and the inner side of the outer cylinder at the tip part, As a result, the generated stress is reduced by lowering the temperature, and the occurrence of deformation and cracks is suppressed, so that damage due to thermal stress can be prevented. As a result, it is possible to obtain a burner nozzle that is less likely to be damaged by thermal stress.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a combustion apparatus (burner) provided with a burner nozzle according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of a burner nozzle.
FIG. 3 is a cross-sectional view of a burner nozzle.
FIG. 4 is a front view of a burner nozzle.
FIG. 5 is an exploded perspective view of a burner nozzle according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view of a burner nozzle.
[Explanation of symbols]
1 Boiler body 2 Burner wind box 3 Burner 4 Furnace 5 Furnace wall 6 Opening 7, 21 Burner nozzle
7a Tip 8 Primary nozzle 9 Secondary nozzle 10 Rib
10a Tip 11 and 22 Tip 12 and 23 Body 13 and 24 Double ring member 14 Bolt
14a, 14b Thread part 15 Nut 16 Radiation fin 17, 25b, 26b Through hole 25 Inner tube part
25a part 26 outer cylinder part
26a site

Claims (3)

内筒と外筒とからなり、内筒と外筒との間にリブを設けたバーナーノズルにおいて、先端部を分割して本体部と二重円環部材とし、二重円環部材を相対的に周方向に移動可能に連結部材により本体部に取り付けたことを特徴とするバーナーノズル。  In a burner nozzle that consists of an inner cylinder and an outer cylinder, and a rib is provided between the inner cylinder and the outer cylinder, the tip is divided into a main body and a double ring member, and the double ring member is relative A burner nozzle characterized by being attached to the main body by a connecting member so as to be movable in the circumferential direction. 内筒と外筒とからなり、内筒と外筒との間にリブを設けたバーナーノズルにおいて、先端部を分割して本体部と二重円環部材とし、更に、二重円環部材を内筒部と外筒部とに分割し、連結部材により内筒部と外筒部とを本体部に取り付けて内筒部と外筒部と本体部とを相対的に周方向に移動可能にして二重円環部材を本体部に取り付けたことを特徴とするバーナーノズル。  In the burner nozzle that consists of an inner cylinder and an outer cylinder, and a rib is provided between the inner cylinder and the outer cylinder, the tip is divided into a main body part and a double annular member, and further a double annular member It is divided into an inner cylinder part and an outer cylinder part, and the inner cylinder part and the outer cylinder part are attached to the main body part by a connecting member so that the inner cylinder part, the outer cylinder part and the main body part are relatively movable in the circumferential direction. A burner nozzle characterized by attaching a double ring member to the main body. 請求項1もしくは請求項2において、リブを先端から後退させて内筒と外筒との間に設けたことを特徴とするバーナーノズル。In claim 1 or claim 2, the burner nozzle, characterized in that provided between the inner tube and the outer tube is retracted ribs from the tip.
JP2001049667A 2001-02-26 2001-02-26 Burner nozzle Expired - Fee Related JP3897534B2 (en)

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WO2016093022A1 (en) * 2014-12-10 2016-06-16 旭硝子株式会社 Burner for glass melting, glass melting furnace, method for melting glass and method for producing glass
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JP2021127870A (en) * 2020-02-14 2021-09-02 ボルカノ株式会社 Throat member and contraction flow swirler for burner device

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