JPH0798104A - Boiler furnace - Google Patents
Boiler furnaceInfo
- Publication number
- JPH0798104A JPH0798104A JP24260493A JP24260493A JPH0798104A JP H0798104 A JPH0798104 A JP H0798104A JP 24260493 A JP24260493 A JP 24260493A JP 24260493 A JP24260493 A JP 24260493A JP H0798104 A JPH0798104 A JP H0798104A
- Authority
- JP
- Japan
- Prior art keywords
- burner
- stage
- air
- furnace
- additional air
- 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]
【産業上の利用分野】本発明は、発電事業用等のボイラ
火炉における低NOx 燃焼技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low NO x combustion technology in a boiler furnace for power generation business and the like.
【0002】[0002]
【従来の技術】図2は従来のボイラ火炉の一例を示す概
略図である。図中(1)はボイラ火炉本体,(2)はデ
・アーチ部,(3)はバーナ部,(4)はオーバファイ
アリングエア(以後OFAと記す),(5)はアディシ
ョナルエア(以後AAと記す),(6)はガス流れをそ
れぞれ示す。2. Description of the Related Art FIG. 2 is a schematic view showing an example of a conventional boiler furnace. In the figure, (1) is a boiler furnace body, (2) is a de-arch section, (3) is a burner section, (4) is overfiring air (hereinafter referred to as OFA), and (5) is additional air (hereinafter referred to as AA). And (6) show the gas flow, respectively.
【0003】このボイラ火炉は、燃料の燃焼を完結する
のに必要な空気の一部をOFA(4)およびAA(5)
としてバーナ部(3)の後流に投入するようにし、バー
ナ部(3)の空気量を減らしてNOx 還元域を形成さ
せ、低NOx 化を図るものである。バーナ部(3)から
AA(5)の前までは空気を絞っているため低NOx 化
は達成されるものの、バーナ部(3)およびそれと一体
の風箱を用いるOFA(4)の空気噴出速度は20〜3
0 m/s と遅いので、空気拡散は悪く、未燃分が急増す
る。さらにAA(5)以後の燃焼域においても、AA流
速=60 m/s 程度としているがまだ十分ではなく、炉
断面に均一に空気を拡散させるのは困難である。In this boiler furnace, some of the air required to complete the combustion of fuel is OFA (4) and AA (5).
So as to put on the downstream of the burner unit (3) as by reducing the air volume of the burner unit (3) to form the NO x reduction zone, it is intended to reduce the NO x reduction. Although low NO x reduction is achieved since the burner unit (3) before the AA (5) are squeezed air, air injection of OFA (4) using the burner unit (3) and its integral wind box Speed is 20-3
Since it is as slow as 0 m / s, air diffusion is poor and unburned content increases rapidly. Further, even in the combustion region after AA (5), the AA flow rate is about 60 m / s, but it is still insufficient, and it is difficult to uniformly diffuse air in the cross section of the furnace.
【0004】[0004]
【発明が解決しようとする課題】従来のAA投入による
低NOx 燃焼法においては、次のような解決すべき課題
があった。 1) 調整時にAA投入量を増すと、主バーナ部の2次
空気流量、ひいては流速が低下するので、拡散不良のま
ま温度の低いAA噴出域まで到達してしまう。そうする
と未燃分が急激に増大する。In the conventional low NO x combustion method by introducing AA, there are the following problems to be solved. 1) If the AA input amount is increased at the time of adjustment, the secondary air flow rate of the main burner portion, and consequently the flow velocity, will decrease, so that the diffusion temperature will reach the low temperature AA jetting area without diffusion. Then, the unburned amount increases rapidly.
【0005】2) NOx 還元域を形成するためにAA
ポートはバーナ部よりやや離れた火炉上部に設置される
ので、AA投入位置よりも下方の微粉炭燃焼域へはAA
空気が拡散し難く、AA投入後の燃焼状態が良くない。2) AA to form the NO x reduction zone
Since the port is installed in the upper part of the furnace, which is slightly away from the burner part, it is necessary to use the AA
The air is difficult to diffuse and the combustion condition after AA is not good.
【0006】[0006]
【課題を解決するための手段】本発明は、前記従来の課
題を解決するために、竪型角筒状で上部にデ・アーチ部
を有し下部に複数段のバーナを備えた発電用のボイラ火
炉において、上記複数段のバーナのうち最上段のバーナ
の上方に近接して配置された下段AA投入ノズルと、上
記デ・アーチ部に炉幅方向に沿って複数配置された上段
AA投入ノズルと、上記上段AA投入ノズルと上記下段
AA投入ノズルのほぼ中間の高さに配置された中段AA
投入ノズルとを備えたことを特徴とするボイラ火炉を提
案するものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention is directed to a power generation device having a vertical rectangular tubular shape, a de-arch portion in the upper portion, and a plurality of burners in the lower portion. In the boiler furnace, a lower stage AA charging nozzle disposed in proximity to the uppermost burner among the plurality of stages of burners, and a plurality of upper stage AA charging nozzles disposed in the de-arch portion along the furnace width direction. And the middle AA arranged at a height approximately midway between the upper AA charging nozzle and the lower AA charging nozzle.
The present invention proposes a boiler furnace characterized by having a charging nozzle.
【0007】[0007]
【作用】本発明においては、最上段のバーナの上方に近
接して配置された下段AA投入ノズルから空気を高速で
吹込むことにより、バーナ部のNOx 還元域を通ってき
て未燃燃料と空気との混合・拡散を良好にする。そして
バーナ部では、従来よりも更に空気量を減らして強いN
Ox 還元域を形成することができる。In the present invention, by injecting air at a high speed from the lower AA charging nozzle that is disposed close to and above the uppermost burner, the air passes through the NO x reduction region of the burner section and becomes unburned fuel. Improves mixing and diffusion with air. In the burner section, the amount of air is further reduced and stronger N than before.
Ox reduction zones can be formed.
【0008】次に中段AA投入ノズルの設置位置は、従
来のAA投入ノズルと同様にバーナ部から比較的離れて
いるので、バーナ部からその上方にかけて十分な大きさ
のNOx 還元域が形成され、NOx が低減する。Next, since the middle AA charging nozzle is installed at a relatively distant position from the burner as in the case of the conventional AA charging nozzle, a sufficiently large NO x reduction zone is formed from the burner to the upper side. , NO x is reduced.
【0009】また上段AA投入ノズルは火炉の横断面積
の小さいデ・アーチ部に設置されるので、ここから空気
を高速で吹出すことにより、更に良好な混合・拡散がで
きる。そして、このノズルを炉幅方向に沿って複数配置
することにより、デ・アーチ部からの燃焼ガスの偏流を
更に大きくし、火炉最上部の炉内空間を有効に活用でき
る。Further, since the upper AA charging nozzle is installed in the de-arch portion of the furnace where the cross-sectional area is small, it is possible to perform better mixing / diffusion by blowing out the air from here at a high speed. By arranging a plurality of these nozzles along the furnace width direction, the drift of the combustion gas from the de-arch portion can be further increased, and the furnace space at the top of the furnace can be effectively utilized.
【0010】[0010]
【実施例】図1は本発明の一実施例を示す概略図であっ
て、図1(a)は縦断側面図,図1(b)は図1(a)
のB−B水平断面図である。図中(1)は竪型角筒状で
上部にデ・アーチ部(2)を有するボイラ火炉本体,
(3)は同ボイラ火炉本体(1)の下部に設けられ複数
段のバーナから成るバーナ部である。(7)は上記複数
段のバーナのうち最上段のバーナの上方に近接して(バ
ーナ1段分程度離して)配置されたノズルから投入され
る下段AA,(9)は上記デ・アーチ部(2)に炉幅方
向に沿って複数配置されたノズルから投入される上段A
A,(8)は上記上段AA(9)の投入ノズルと上記下
段AA(7)の投入ノズルのほぼ中間の高さに配置され
たノズルから投入される中段AAである。また(6)は
ガス流れを示す。1 is a schematic view showing an embodiment of the present invention. FIG. 1 (a) is a vertical side view and FIG. 1 (b) is FIG. 1 (a).
It is a BB horizontal sectional view. In the figure, (1) is a vertical rectangular tube-shaped boiler furnace body having a de-arch section (2) at the top,
(3) is a burner portion which is provided in the lower part of the boiler furnace body (1) and is composed of a plurality of stages of burners. (7) is a lower stage AA, which is introduced from a nozzle arranged close to (above about one stage of the burner) above the uppermost burner of the plurality of stages of burners, and (9) is the de-arch section. Upper stage A that is charged from a plurality of nozzles arranged in (2) along the furnace width direction
A and (8) are middle stages AA which are thrown from nozzles arranged at a height approximately midway between the throwing nozzles of the upper stage AA (9) and the lower stage AA (7). Moreover, (6) shows a gas flow.
【0011】下段AA(7)は噴出流速を60 m/s 以
上に保持し、AA量は空気比にして0.3程度とする。
これにより、バーナ部(3)のNOx 還元域を通ってき
た未燃燃料、例えば未燃微粉炭粒子(チャー)と空気と
の混合・拡散が良好になって、それら未燃分が燃焼す
る。そしてバーナ部(3)では従来よりも更に空気量を
減らして強いNOx 還元域を形成することができる。上
記下段AA(7)の投入位置は従来のOFA(図2の符
号(4))投入装置とほぼ同じである。しかし、従来の
OFA(4)はバーナと共通の風箱を用いていたので、
噴出流速を大きくすることができなかったのに対し、本
実施例ではバーナの風箱とは独立したAA(7)として
投入するので、流速を自由に選ぶことができ、これを6
0 m/s 以上に保持するのである。The lower stage AA (7) maintains the jet flow velocity at 60 m / s or more, and the AA amount is about 0.3 in terms of air ratio.
As a result, mixing and diffusion of unburned fuel, such as unburned pulverized coal particles (char), and air that have passed through the NO x reduction region of the burner section (3) is improved, and these unburned components are burned. . Further, in the burner section (3), the amount of air can be further reduced to form a strong NO x reduction region as compared with the conventional case. The lower AA (7) charging position is almost the same as that of the conventional OFA (reference numeral (4) in FIG. 2) charging device. However, since the conventional OFA (4) used the same wind box as the burner,
While it was not possible to increase the jet flow velocity, in this embodiment, the flow velocity can be freely selected because it is input as AA (7) independent of the burner wind box,
It is maintained at 0 m / s or more.
【0012】次に中段AA(8)は、従来のAA(前記
図2の符号(5))と同様の役割を果たす。すなわちバ
ーナ部(3)からやや離れた位置に投入されるので、バ
ーナ部(3)からその上方にかけて十分な大きさのNO
x 還元域が形成され、NOxが低減される。この中段A
A(8)も噴出流速を60 m/s 以上に保持し、AA量
は空気比にして0.3程度とする。なお図1には中段A
A(8)が1段だけ示されているが、これを2段以上と
してもよい。Next, the middle AA (8) plays the same role as the conventional AA (reference numeral (5) in FIG. 2). That is, since it is introduced at a position slightly away from the burner section (3), a sufficient amount of NO is provided from the burner section (3) to above it.
An x reduction zone is formed and NO x is reduced. This middle stage A
The jet flow velocity of A (8) is also maintained at 60 m / s or more, and the AA amount is about 0.3 in terms of air ratio. In addition, in FIG.
Although only one stage of A (8) is shown, the number of stages may be two or more.
【0013】最後に上段AA(9)は、火炉の横断面積
の小さいデ・アーチ部(2)に設置することにより、6
0 m/s の流速で空気の混合・拡散が更に良好になる。
そしてこれにより未燃分は更に減少する。AA量は空気
比にして0.1程度でよい。また、炉幅方向に沿う数か
所から噴き出すことにより、デ・アーチ部(2)からの
燃焼ガスの偏流を更に大きくし、火炉本体(1)最上部
の炉内空間を有効に活用する。Finally, the upper stage AA (9) is installed in the de-arch section (2) of the furnace where the cross-sectional area is small.
At a flow velocity of 0 m / s, the mixing and diffusion of air becomes even better.
As a result, the unburned content is further reduced. The AA amount may be about 0.1 in terms of air ratio. Further, by blowing out from several places along the furnace width direction, the drift of the combustion gas from the de-arch part (2) is further increased, and the furnace space at the top of the furnace body (1) is effectively utilized.
【0014】要約すると、従来のAA投入方式では、バ
ーナ部の空気を絞ることによりバーナ部を空気不足に
し、発生NOx をN2 に還元するものであった。しかし
この方式では、未燃分の増大を招くことになる。本発明
においても、中段AA(8)はNOx 低減が目的である
が、上段AA(9)および下段AA(7)は未燃分低減
が主目的である。すなわち、バーナ部(3)では基本的
に空気の拡散が良好なので、空気を十分に絞ってNOx
を低減させる。次にバーナ部(3)の未燃分をそのすぐ
上の下段AA(7)が60 m/s の高流速噴流で急速燃
焼させる。この際NOx は増大するが、これを中段AA
(8)までに還元する。その後、デ・アーチ部(2)か
ら上段AA(9)を投入することにより、未燃分を更に
低減する。この場合ガス温度は十分低くなっており、N
Ox はあまり発生しないが未燃分は減少することが、シ
ミュレーション解析等の結果で確認されている。In summary, in the conventional AA charging system, the air in the burner section is squeezed to make the burner section air-deficient and the generated NO x is reduced to N 2 . However, this method causes an increase in unburned components. Also in the present invention, the middle stage AA (8) is intended to reduce NO x , while the upper stage AA (9) and the lower stage AA (7) are mainly intended to reduce unburned components. That is, since the air diffusion is basically good in the burner section (3), the air is sufficiently squeezed to NO x.
To reduce. Next, the unburned part of the burner part (3) is rapidly burned by the high speed jet of 60 m / s in the lower stage AA (7) immediately above. At this time, NO x increases, but this is
Reduce by (8). After that, the unburned component is further reduced by charging the upper stage AA (9) from the de-arch portion (2). In this case, the gas temperature is sufficiently low that N
It has been confirmed by the results of simulation analysis that the amount of unburned oxygen is reduced although the amount of O x is not generated so much.
【0015】図3は本発明の効果を確認するために大型
燃焼試験炉を用いて行なった試験の結果を例示するもの
で、全AA量に対するNOx 量と灰中未燃分を、従来の
ボイラ火炉の場合と比較して示す。従来と比べ本発明で
は灰中未燃分が大幅に減少することが、この図からも判
る。[0015] Figure 3 is illustrative of the large combustion test furnace results of tests carried out using in order to confirm the effects of the present invention, the amount of NO x and ash unburned to the total AA content, conventional It is shown in comparison with the case of a boiler furnace. It can be seen from this figure that the unburned content in the ash is significantly reduced in the present invention as compared with the prior art.
【0016】[0016]
【発明の効果】本発明によれば、発電用のボイラ火炉に
おいて、NOx 発生量を増加させることなく、灰中の未
燃分を従来よりも大幅に減少させることができる。According to the present invention, in the boiler furnace for power generation, the unburned content in the ash can be significantly reduced as compared with the conventional one, without increasing the NO x generation amount.
【図1】図1は本発明の一実施例を示す概略図であっ
て、図1(a)は縦断側面図,図1(b)は図1(a)
のB−B水平断面図である。1 is a schematic view showing an embodiment of the present invention, FIG. 1 (a) is a vertical side view, and FIG. 1 (b) is FIG. 1 (a).
It is a BB horizontal sectional view.
【図2】図2は従来のボイラ火炉の一例を示す概略図で
ある。FIG. 2 is a schematic diagram showing an example of a conventional boiler furnace.
【図3】図3は本発明の効果を確認する試験の結果を例
示する図である。FIG. 3 is a diagram illustrating the result of a test for confirming the effect of the present invention.
(1) ボイラ火炉本体 (2) デ・アーチ部 (3) バーナ部 (4) オーバファイアリングエア(OFA) (5) アディショナルエア(AA) (6) ガス流れ (7) 下段AA (8) 中段AA (9) 上段AA (1) Boiler furnace body (2) De-arch section (3) Burner section (4) Over-firing air (OFA) (5) Additional air (AA) (6) Gas flow (7) Lower stage AA (8) Middle stage AA (9) Upper AA
Claims (1)
下部に複数段のバーナを備えた発電用のボイラ火炉にお
いて、上記複数段のバーナのうち最上段のバーナの上方
に近接して配置された下段アディショナルエア投入ノズ
ルと、上記デ・アーチ部に炉幅方向に沿って複数配置さ
れた上段アディショナルエア投入ノズルと、上記上段ア
ディショナルエア投入ノズルと上記下段アディショナル
エア投入ノズルのほぼ中間の高さに配置された中段アデ
ィショナルエア投入ノズルとを備えたことを特徴とする
ボイラ火炉。1. A boiler furnace for power generation, which has a vertical rectangular tube shape, has a de-arch section in an upper portion, and has a plurality of burners in a lower portion, and has a plurality of burners above the uppermost burner. The lower additional air charging nozzles arranged in close proximity, the upper additional air charging nozzles arranged in the de-arch section along the furnace width direction, the upper additional air charging nozzle and the lower additional air charging nozzle A boiler furnace equipped with a middle-stage additional air injection nozzle arranged at approximately the middle height.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24260493A JP3160437B2 (en) | 1993-09-29 | 1993-09-29 | Boiler furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24260493A JP3160437B2 (en) | 1993-09-29 | 1993-09-29 | Boiler furnace |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0798104A true JPH0798104A (en) | 1995-04-11 |
JP3160437B2 JP3160437B2 (en) | 2001-04-25 |
Family
ID=17091523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24260493A Expired - Fee Related JP3160437B2 (en) | 1993-09-29 | 1993-09-29 | Boiler furnace |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3160437B2 (en) |
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US6832955B2 (en) | 1997-02-19 | 2004-12-21 | Kabushiki Kaisha Bandai | Breeding simulation apparatus for virtual creatures |
US5966526A (en) * | 1997-03-18 | 1999-10-12 | Kabushiki Kaisha Bandai | Simulation device for fostering a virtual creature |
EP1078666A2 (en) | 1999-08-26 | 2001-02-28 | Nintendo Co., Ltd. | Image-display game system and information storage medium used therefor |
EP1078664A2 (en) | 1999-08-26 | 2001-02-28 | Nintendo Co., Ltd. | Game machine and storage medium therefor |
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