JP2756098B2 - Pulverized coal burner - Google Patents
Pulverized coal burnerInfo
- Publication number
- JP2756098B2 JP2756098B2 JP7179272A JP17927295A JP2756098B2 JP 2756098 B2 JP2756098 B2 JP 2756098B2 JP 7179272 A JP7179272 A JP 7179272A JP 17927295 A JP17927295 A JP 17927295A JP 2756098 B2 JP2756098 B2 JP 2756098B2
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- supply pipe
- burner
- adjusting means
- 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.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【発明の属する技術分野】本願発明はボイラなど燃焼炉
に用いる微粉炭バーナに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulverized coal burner used in a combustion furnace such as a boiler.
【０００２】[0002]
【従来の技術】図７に微粉炭ボイラの燃料供給設備のシ
ステム構成の概略を示す。図７において、石炭は石炭供
給管９０８を通って石炭粉砕機９０３に供給され粉砕さ
れる。微粉炭搬送用空気は送風機９０４で昇圧され微粉
炭搬送用空気管９１０を通って石炭粉砕機９０３に投入
され、粉砕された石炭（微粉炭）とともに微粉炭供給配
管９０６を通ってバーナ９０５へ送られ、ボイラ９０１
の炉内に投入される。一方、燃焼用空気は燃焼用空気送
風機９０２で昇圧され、燃焼用空気配管９０７を通って
バーナ９０５へ送られ、同じくボイラの炉内に投入され
る。2. Description of the Related Art FIG. 7 schematically shows a system configuration of a fuel supply facility for a pulverized coal boiler. In FIG. 7, coal is supplied to a coal pulverizer 903 through a coal supply pipe 908 and pulverized. The air for pulverized coal transport is pressurized by the blower 904, is supplied to the coal pulverizer 903 through the pulverized coal transport air pipe 910, and is sent to the burner 905 together with the pulverized coal (pulverized coal) through the pulverized coal supply pipe 906. , Boiler 901
Into the furnace. On the other hand, the pressure of the combustion air is increased by a combustion air blower 902, sent to a burner 905 through a combustion air pipe 907, and similarly charged into a furnace of a boiler.
【０００３】図８に従来の微粉炭バーナの概略断面図を
示す。図８において、１０１は微粉炭バーナ、１０２は
燃焼室、１０３は微粉炭供給管、１０４は２次空気供給
管、１０５はバーナスロート、１０６は２次空気そらせ
板、１０７は３次空気そらせ板、１０８はベンド部、１
０９は保炎器（スワラ）、１１０は液体燃料噴射管、１
１１は液体燃料噴射管挿入管、１１２は２次空気旋回
器、１１３は３次空気旋回器、１１５は微粉炭供給配
管、１１６は微粉炭・搬送用空気、１１７は２次燃焼用
空気、１１８は３次燃焼用空気である。FIG. 8 is a schematic sectional view of a conventional pulverized coal burner. 8, 101 is a pulverized coal burner, 102 is a combustion chamber, 103 is a pulverized coal supply pipe, 104 is a secondary air supply pipe, 105 is a burner throat, 106 is a secondary air deflector, 107 is a tertiary air deflector , 108 is a bend part, 1
09 is a flame stabilizer (swirler), 110 is a liquid fuel injection pipe, 1
11 is a liquid fuel injection pipe insertion pipe, 112 is a secondary air swirler, 113 is a tertiary air swirler, 115 is pulverized coal supply piping, 116 is pulverized coal / transport air, 117 is secondary combustion air, 118 Is tertiary combustion air.
【０００４】燃料である石炭は石炭粉砕機で平均粒径１
００ミクロン程度以下に粉砕され、搬送用気体（通常は
空気で炉内では燃焼用空気の一部として使用される。）
で搬送され、微粉炭バーナの微粉炭供給管を経て燃焼炉
内に投入される。一方、燃焼用空気は微粉炭供給管の周
囲の通路を通って同じく燃焼炉内に投入される。[0004] Coal, which is a fuel, has an average particle size of 1 in a coal pulverizer.
It is pulverized to about 00 microns or less and is used as a carrier gas (usually air and used as a part of combustion air in a furnace).
And is charged into the combustion furnace through the pulverized coal supply pipe of the pulverized coal burner. On the other hand, the combustion air is also introduced into the combustion furnace through a passage around the pulverized coal supply pipe.
【０００５】微粉炭バーナは通常、着火・保炎性を向上
させるために微粉炭供給管の先端部に保炎器（スワラ）
を設け、微粉炭を炉内に分散したり炉内に比較的大きな
逆流領域を発生させるなどを行っている。また、燃焼用
空気はＮＯX 発生量の低減化のために空気を複数の流れ
に分割し、２次、３次とし、それぞれの通路に旋回羽根
を設けたり、先端部に空気そらせ板を設けるなどを行っ
ている。A pulverized coal burner is usually provided with a flame stabilizer (swirler) at the tip of a pulverized coal supply pipe in order to improve ignition and flame holding properties.
To disperse pulverized coal in the furnace and generate a relatively large backflow region in the furnace. The combustion air is divided into a plurality of streams of air for reduction of the NO X generation amount, second, third and then, the respective passages may be provided with swirl vanes, provided the air deflector at the distal end And so on.
【０００６】上記以外の従来の技術の例として、特開昭
６２−１５３６１０号公報記載の微粉炭バーナがある。
該バーナはバーナノズル先端部に取り付けた保炎リング
内に微粉炭と１次空気との混合気を導入する通路を設
け、微粉炭を含む混合気をバーナノズル先端部から炉内
に供給するとともに保炎リング内にも供給し、これによ
ってバーナノズルからの微粉炭の噴出速度の変化および
石炭／空気比の変化時においても、常に保炎リング内に
微粉炭が供給されるとともにバーナノズルから噴出した
微粉炭の巻き返しおよび２次空気の保炎リング内への巻
き込みにより、適切な微粉炭濃度領域を形成して安定し
た火炎形成を図るというものである。As another example of the conventional technique other than the above, there is a pulverized coal burner described in Japanese Patent Application Laid-Open No. Sho 62-153610.
In the burner, a passage for introducing a mixture of pulverized coal and primary air is provided in a flame holding ring attached to the tip of the burner nozzle, and a mixture containing pulverized coal is supplied into the furnace from the tip of the burner nozzle and flame holding is performed. The pulverized coal discharged from the burner nozzle is always supplied to the flame holding ring and the pulverized coal discharged from the burner nozzle is constantly supplied even when the pulverized coal blowing rate from the burner nozzle changes and the coal / air ratio changes. By rewinding and entraining the secondary air into the flame holding ring, an appropriate pulverized coal concentration region is formed to achieve stable flame formation.
【０００７】またこのほかの従来技術として、特開昭６
２−１４２６１０号公報に記載の濃淡燃焼型微粉炭バー
ナがある。該発明は微粉炭ノズルの内面に絞り部を設け
るとともに微粉炭ノズルの軸中心部にプラグを軸中心方
向に進退自在に配設し、更に微粉炭ノズルの噴出部内側
に両端を開口した円筒を同心円状に設けることにより、
微粉炭の濃度が濃い領域と薄い領域を微粉炭ノズル内に
同心円状に形成し、微粉炭の外周部から旋回する燃焼用
空気を送入して燃焼することにより、着火性を良くし、
燃焼効率の向上を図るほか、微粉炭ノズルの噴出口の内
縁およびその内側に配設した円筒の噴出端部内側にリン
グ状の突起を設けることにより渦流を発生させ、微粉炭
の着火の安定が行われるとするものである。Another prior art is disclosed in Japanese Unexamined Patent Publication No.
There is a rich-burn type pulverized coal burner described in JP-A-2-142610. In the invention, a throttle portion is provided on the inner surface of the pulverized coal nozzle, a plug is disposed at the axial center of the pulverized coal nozzle so as to be able to advance and retreat in the axial direction, and a cylinder having both ends opened inside the ejection portion of the pulverized coal nozzle. By providing concentric circles,
A region where the concentration of the pulverized coal is high and a region where the concentration is low are formed concentrically in the pulverized coal nozzle, and the combustion air swirling from the outer periphery of the pulverized coal is burned to improve the ignitability.
In addition to improving combustion efficiency, a ring-shaped projection is provided on the inner edge of the pulverized coal nozzle outlet and on the inside of the ejection end of the cylinder disposed inside the pulverized coal nozzle, thereby generating a vortex and stabilizing the ignition of the pulverized coal. It is to be done.
【０００８】[0008]
【発明が解決しようとする課題】以上述べた燃料供給シ
ステムや微粉炭バーナでも、バーナの着火・保炎性の向
上、ＮＯX 発生量の低減に対する改善はそれなりに進ん
でいるが、近年微粉炭ボイラにおいては低負荷から高負
荷まで安定して燃焼するバーナ、すなわちワイドレンジ
バーナの必要性が高まっている。以下に従来のバーナが
有していた課題を詳しく説明し、それを解決する本願発
明の有効性をより明確にする。In the fuel supply system or pulverized coal burner as described above [0005], improving ignition and flame stability of the burner, improvements to reduce of the NO X generation amount has progressed in its own way, recently pulverized coal In boilers, there is an increasing need for burners that burn stably from low loads to high loads, that is, wide-range burners. Hereinafter, the problems of the conventional burner will be described in detail, and the effectiveness of the present invention for solving the problems will be clarified.
【０００９】（ａ）空気／石炭比に係る課題 現在一般的に使用されている微粉炭供給システムにおい
ては石炭粉砕機と微粉炭バーナを直結して使用してい
る。ボイラ負荷が低下すると供給される石炭量が低下
し、燃焼炉に投入される微粉炭量は負荷に比例して低下
するが、微粉炭を搬送する空気は石炭粉砕機の特性上負
荷に比例させて下げることができない。そのためボイラ
負荷が低下すると空気／石炭比が増加することになる。
一方空気／石炭比と着火・保炎性との関係を見ると、図
９に示す通り空気／石炭の増加につれて安定着火・燃焼
する範囲が少なくなっている。また一般的な石炭粉砕機
の負荷（石炭流量）と空気／石炭比の関係は図１０に示
すとおり、負荷が下がると空気／石炭比が大幅に増加す
る。この両者の関係からバーナ負荷をあるレベルから下
げることができないという課題がある。(A) Problems related to the air / coal ratio In a pulverized coal supply system generally used at present, a coal pulverizer and a pulverized coal burner are directly connected and used. When the boiler load decreases, the amount of coal supplied decreases, and the amount of pulverized coal supplied to the combustion furnace decreases in proportion to the load.However, the air carrying pulverized coal is proportional to the load due to the characteristics of the coal crusher. I can't lower it. Therefore, when the boiler load decreases, the air / coal ratio increases.
On the other hand, looking at the relationship between the air / coal ratio and the ignition / flame holding properties, as shown in FIG. 9, the range of stable ignition / combustion decreases as the air / coal increase. As shown in FIG. 10, the relationship between the load (coal flow rate) and the air / coal ratio of a general coal pulverizer is such that when the load decreases, the air / coal ratio greatly increases. Due to the relationship between the two, there is a problem that the burner load cannot be reduced from a certain level.
【００１０】この課題に対応するために石炭粉砕機とバ
ーナとの間に一時的に微粉炭を貯蔵し、石炭粉砕機とバ
ーナとの直結を避ける方式を採用することも一部で考え
られているが、そのためには微粉炭貯蔵を別個に設けた
り、系統が複雑になるなどの不具合を有している。In order to cope with this problem, it has been considered that a method of temporarily storing pulverized coal between a coal crusher and a burner to avoid a direct connection between the coal crusher and the burner is adopted. However, this has disadvantages such as separately providing pulverized coal storage and complicating the system.
【００１１】（ｂ）微粉炭供給管内での微粉炭の片寄り
の課題 図８に示す通り微粉炭バーナは通常、ボイラ前のスペー
スの点から微粉炭供給管が微粉炭バーナの最上流部でほ
ぼ直角に折れ曲がっている。また、微粉炭供給配管の上
流側でも複数回の折れ曲がりの設けられているのが通例
である。このような折れ曲がりがあると、折れ曲がりの
入口側で周方向に均一な分布を示している微粉炭濃度も
折れ曲がりの下流側では周方向に大きな濃度分布の不均
一性を生じることになる。(B) Problem of Pulverized Coal Bias in Pulverized Coal Supply Pipe As shown in FIG. 8, the pulverized coal burner is usually located at the most upstream part of the pulverized coal burner in view of the space before the boiler. It is bent almost at a right angle. Also, it is customary that a plurality of bends are provided on the upstream side of the pulverized coal supply pipe. With such a bend, the pulverized coal concentration which shows a uniform distribution in the circumferential direction on the inlet side of the bend also causes a large non-uniformity of the concentration distribution in the circumferential direction on the downstream side of the bend.
【００１２】図６は図８における微粉炭バーナの下部か
ら垂直に上方向に向かい微粉炭供給管入口部において９
０°方向転換して水平方向に配置された微粉炭供給管に
おける折れ曲がり部（ベンド部）下流の微粉炭濃度の分
布を３次元の固−気流動解析によって計算したもので、
周方向に、特に上下方向に大きな濃度分布の片寄りが見
られる。FIG. 6 is a vertical sectional view of the pulverized coal supply pipe at the inlet of the pulverized coal supply pipe from the lower part of the pulverized coal burner in FIG.
The distribution of the concentration of pulverized coal downstream of the bend (bend) in the pulverized coal supply pipe which is turned in the 0 ° direction and arranged horizontally is calculated by three-dimensional solid-gas flow analysis.
A large deviation of the concentration distribution is observed in the circumferential direction, particularly in the vertical direction.
【００１３】このような濃度の片寄りをもったものがバ
ーナの微粉炭供給管に流入した際には、バーナ内部では
濃度の均一化が行われず炉内に投入される微粉炭は周方
向に片寄り、ひいては炉内に形成される火炎が同心円状
にならず燃焼用空気との混合が片寄ることにより燃焼悪
化など様々な不具合が発生する。When the coal having such a biased concentration flows into the pulverized coal supply pipe of the burner, the concentration is not made uniform inside the burner, and the pulverized coal introduced into the furnace is displaced in the circumferential direction. The misalignment and, consequently, the flame formed in the furnace do not become concentric and the mixture with the combustion air is offset, causing various problems such as deterioration of combustion.
【００１４】（ｃ）ＮＯX 低減上の課題 従来のバーナでは着火・保炎性を確保するためにバーナ
の先端に図８に示すように保炎器（スワラ）を設け、微
粉炭を炉内に分散したり、炉内に比較的大きな逆流域を
発生させている。一方、微粉炭バーナにおける低ＮＯX
化にはバーナ投入口近傍で極力早く微粉炭に着火し、少
ない空気で空気不足の条件すなわち、還元雰囲気下で安
定燃焼させることが要求されている。[0014] (c) NO X reduction challenges flame stabilizing ring 8 to the tip of the burner to ensure the ignition and flame stability in the conventional burner (swirler) is provided, the pulverized coal furnace Or generate a relatively large backflow area in the furnace. On the other hand, low NO X in pulverized coal burners
It is required that the pulverized coal be ignited as soon as possible near the burner inlet, and that stable combustion be performed with a small amount of air under conditions of insufficient air, that is, under a reducing atmosphere.
【００１５】この要求に対して上記の保炎器による微粉
炭の分散や大きな逆流域の発生は、燃焼用空気（２次，
３次）と、分散された微粉炭が早期に混合し、ＮＯX 低
減に必要な還元雰囲気を作ることが困難になりＮＯX 低
減上制約となる。また、それを防ぐために分散された微
粉炭と燃焼用空気との混合を遅らせる方法として、例え
ば燃焼用空気をより強く外側にそらせて流してやるな
ど、バーナの構造をより複雑にする必要がある。[0015] In response to this requirement, the dispersion of pulverized coal and the generation of a large backflow region by the above-mentioned flame stabilizing device are caused by combustion air (secondary,
And third order), distributed pulverized coal are mixed at an early stage, the NO X reduction on constraints it is difficult to make a reducing atmosphere required in the NO X reduction. Further, as a method of delaying the mixing of the dispersed pulverized coal and the combustion air in order to prevent this, it is necessary to make the structure of the burner more complicated, for example, by flowing the combustion air more strongly outward.
【００１６】本願発明はこのような現状に鑑みてなされ
たもので、簡潔な構成によって，微粉炭供給管の上流側
の微粉炭供給配管のベンド部等で発生した微粉炭濃度の
周方向の片寄りを是正して周方向の濃度分布を均一化す
るとともに、微粉炭供給管内における空気／石炭比が中
心側が高く周壁側が低くなる分布を形成させ、更に微粉
炭の旋回角度を調整して炉内に最適な旋回角度で投入さ
せ得る微粉炭バーナを提供することを目的としている。The present invention has been made in view of such a situation, and has a simple structure, and has a circumferential configuration of a pulverized coal concentration generated in a bend portion or the like of a pulverized coal supply pipe upstream of a pulverized coal supply pipe. In addition to correcting the deviation and making the concentration distribution in the circumferential direction uniform, the distribution in which the air / coal ratio in the pulverized coal supply pipe is higher on the center side and lower on the peripheral wall side is further adjusted. The purpose of the present invention is to provide a pulverized coal burner that can be charged at an optimum turning angle.
【００１７】[0017]
【課題を解決するための手段】上記の目的は、前記特許
請求の範囲に記載された微粉炭バーナによって達成され
る。すなわち、 (1) 空気等の気体によって微粉炭を搬送し、燃焼炉内に
投入し、別途投入される空気または酸化材と合わせて燃
焼反応を行わせるボイラの微粉炭バーナにおいて、微粉
炭供給管内軸心部に液体燃料噴射管挿入管を挿通させ、
該挿入管の上流側の所定位置に複数の板状羽根を管の外
周部かつ軸心と所定の角度でバーナの半径方向に植設し
た旋回羽根を挿通固定して微粉炭を微粉炭供給管の内周
壁側に集中的に濃縮させるとともに該供給管内の周方向
の微粉炭の濃度分布を均一化させる微粉炭濃度調整手段
となし、微粉炭供給管内壁側下流先端部近傍に、複数の
羽根を該供給管の軸心とほぼ平行に設けて上流側から流
入する微粉炭流の旋回度を減じて燃焼炉内に投入させる
微粉炭旋回度調整手段となした微粉炭バーナ。The above object is achieved by a pulverized coal burner as set forth in the appended claims. (1) Pulverized coal is transported by gas such as air, is charged into the combustion furnace, and the pulverized coal is supplied to the pulverized coal burner of a boiler that performs a combustion reaction together with air or oxidizer separately charged. Insert the liquid fuel injection tube insertion tube into the shaft center,
At a predetermined position on the upstream side of the insertion pipe, a plurality of plate-like blades are implanted at a predetermined angle with respect to the outer peripheral portion of the pipe and the axis in the radial direction of the burner, and the swirling blades are inserted and fixed to supply pulverized coal to the pulverized coal supply pipe. No pulverized coal concentration adjusting means for concentrating the pulverized coal concentration in the supply pipe in a concentrated manner on the inner peripheral wall side and uniformizing the distribution of pulverized coal concentration in the circumferential direction in the supply pipe. A pulverized coal burner provided as a pulverized coal swirl degree adjusting means for reducing the swirl degree of the pulverized coal stream flowing in from the upstream side and feeding the pulverized coal stream into the combustion furnace by substantially providing the pulverized coal stream flowing from the upstream side.
【００１８】(2) 微粉炭濃度調整手段の板状羽根のバー
ナ半径方向反軸心側端部が、微粉炭供給管の内周壁に達
するものである(1) 記載の微粉炭バーナ。(2) The pulverized coal burner according to (1), wherein an end of the plate-like blade of the pulverized coal concentration adjusting means on the opposite side of the burner in the radial direction reaches the inner peripheral wall of the pulverized coal supply pipe.
【００１９】(3) 微粉炭旋回度調整手段の羽根の高さ
は、羽根のバーナ半径方向軸心側端部が、微粉炭供給管
の軸心に到達しない範囲内の寸法に形成される(1) 〜
(2) のうちいずれか１項に記載の微粉炭バーナ。(3) The height of the blade of the pulverized coal swirl degree adjusting means is formed so that the end of the blade on the burner radial axis side does not reach the axis of the pulverized coal supply pipe ( 1) ~
The pulverized coal burner according to any one of (2).
【００２０】(4) 微粉炭旋回度調整手段と微粉炭濃度調
整手段が両方とも固定されたものである(1) 〜(3) のう
ちいずれか１項に記載の微粉炭バーナ。(5) 微粉炭旋回
度調整手段と微粉炭濃度調整手段がいずれか一方が調節
可能なものである(1) 〜(3) のうちいずれか１項に記載
の微粉炭バーナ。(4) The pulverized coal burner according to any one of (1) to (3), wherein both the pulverized coal swirl degree adjusting means and the pulverized coal concentration adjusting means are fixed. (5) The pulverized coal burner according to any one of (1) to (3), wherein one of the pulverized coal swirl degree adjusting means and the pulverized coal concentration adjusting means is adjustable.
【００２１】(6) 微粉炭旋回度調整手段と微粉炭濃度調
整手段の両方とも調節可能なものである(1) 〜(3) のう
ちいずれか１項に記載の微粉炭バーナ。 (7) 微粉炭濃度調整手段が軸心と平行な方向に移動可能
なものである(1) 〜(3)のうちいずれか１項に記載の微
粉炭バーナ。(6) The pulverized coal burner according to any one of (1) to (3), wherein both the pulverized coal swirl degree adjusting means and the pulverized coal concentration adjusting means are adjustable. (7) The pulverized coal burner according to any one of (1) to (3), wherein the pulverized coal concentration adjusting means is movable in a direction parallel to the axis.
【００２２】(8) 微粉炭旋回度調整手段が軸心と平行な
方向に移動可能なものである(1) 〜(3) のうちのいずれ
か１項に記載の微粉炭バーナ。 (9) 微粉炭旋回度調整手段と微粉炭濃度調整手段の両方
が軸心と平行な方向に移動可能なものである(1) 〜(3)
のうちいずれか１項に記載の微粉炭バーナ。である。(8) The pulverized coal burner according to any one of (1) to (3), wherein the pulverized coal swirling degree adjusting means is movable in a direction parallel to the axis. (9) Both the pulverized coal swirl degree adjusting means and the pulverized coal concentration adjusting means can be moved in a direction parallel to the axis (1) to (3).
The pulverized coal burner according to any one of the above. It is.
【００２３】[0023]
【発明の実施の形態】微粉炭供給管の上流側にベンド管
等、管の内部を流通する微粉炭に偏流を生ぜしめる部位
を有する微粉炭バーナにおいても、微粉炭供給管内の上
流側に設けた微粉炭濃度調整手段によって、その下流側
の微粉炭供給管内においては、微粉炭供給管の中心側に
空気／石炭比が高く内周壁側に空気／石炭比の低い濃度
分布領域を形成させるとともに、微粉炭供給管の軸心と
垂直な断面における円周方向においてもより均一化した
濃度分布の空気・微粉炭の流れを形成させて炉内に投入
することができる。BEST MODE FOR CARRYING OUT THE INVENTION A pulverized coal burner having a portion, such as a bend pipe, on the upstream side of a pulverized coal supply pipe that causes a drift in pulverized coal flowing inside the pipe, is also provided upstream of the pulverized coal supply pipe. In the pulverized coal supply pipe on the downstream side of the pulverized coal supply pipe, a concentration distribution region having a high air / coal ratio at the center side of the pulverized coal supply pipe and a low air / coal ratio at the inner peripheral wall side is formed. In addition, a flow of air / pulverized coal having a more uniform concentration distribution in the circumferential direction in a cross section perpendicular to the axis of the pulverized coal supply pipe can be formed and introduced into the furnace.
【００２４】図５および図６は、上流部にベンド管が設
けられた微粉炭供給管において、微粉炭供給管内の上流
側に微粉炭濃度調整手段として旋回羽根を設置した場合
と、設置しない場合とにおける微粉炭供給管内の微粉炭
濃度分布の３次元固・気二相流解析結果を示す図であ
る。図５，６において図中の数字は空気／石炭比を示し
ている。旋回羽根を有する場合の図５においては、旋回
羽根を有しない場合の図６と比較して、円周方向の微粉
炭の片寄りを緩和してほぼ均一な分布にすることができ
るとともに、半径方向の分布をみた場合、管の内周壁に
近い位置に空気／石炭比の低い部分が形成されるのが明
らかにみられる。FIGS. 5 and 6 show a pulverized coal supply pipe provided with a bend pipe at an upstream portion, in which a swirl vane is installed as a pulverized coal concentration adjusting means on the upstream side of the pulverized coal supply pipe, and when it is not installed. FIG. 4 is a diagram showing a three-dimensional solid-gas two-phase flow analysis result of the pulverized coal concentration distribution in the pulverized coal supply pipe at the above. 5 and 6, the numbers in the figures indicate the air / coal ratio. In the case of FIG. 5 having the swirling blade, in FIG. 5, the deviation of the pulverized coal in the circumferential direction can be reduced to make the distribution substantially uniform, as compared with FIG. When looking at the distribution in the direction, it is apparent that a portion having a low air / coal ratio is formed at a position close to the inner peripheral wall of the tube.
【００２５】しかしながら、微粉炭供給管内上流部に旋
回羽根等の濃度調整機能を付与する手段を設けた場合、
該供給管から燃焼炉内に噴出した微粉炭は搬送用空気お
よび微粉炭が旋回成分を有することにより、炉内に噴出
後微粉炭バーナの軸心と垂直な方向に拡散するように過
度に広がり、バーナの低ＮＯX 化に不都合をもたらす。However, when a means for imparting a concentration adjusting function such as a swirling blade is provided at an upstream portion in the pulverized coal supply pipe,
The pulverized coal ejected from the supply pipe into the combustion furnace is excessively spread so as to diffuse in the direction perpendicular to the axis of the pulverized coal burner after being ejected into the furnace due to the conveying air and the pulverized coal having a swirl component. , resulting in inconvenience to the low NO X of the burner.
【００２６】それに対して微粉炭旋回度調整手段とし
て、例えば微粉炭供給管内先端近傍に複数の羽根を該供
給管の軸心とほぼ平行をなすように設けることにより、
微粉炭は炉内で過度に広がることなく、２，３次空気と
の混合も遅らせられて、低ＮＯX 化に必要な還元雰囲気
下の燃焼状況を形成させることが可能になる。On the other hand, as a pulverized coal swirling degree adjusting means, for example, a plurality of blades are provided near the tip of the pulverized coal supply pipe so as to be substantially parallel to the axis of the supply pipe.
Pulverized coal without spreading excessively in the furnace, is also delayed mixing of the 2,3 primary air, it is possible to form the combustion condition of reducing atmosphere required for low NO X reduction.
【００２７】すなわち、微粉炭供給管内上流側に設けた
微粉炭濃度調整手段によって該供給管内の内周壁側に空
気／石炭比が低く中心側に空気／石炭比が高い分布を形
成するとともに、更にその上流側にあるベンド部等に基
づいて微粉炭供給管内の周方向に発生した微粉炭濃度の
片寄りを是正して均一化し、安定した着火・保炎と燃焼
性の確保を図るとともに、下流側に設けた微粉炭旋回度
調整手段によって過度の旋回成分を減じ、最適な旋回角
度で炉内に投入することにより、炉内に投入された微粉
炭が２，３次空気と早期に混合するのを抑制し、低ＮＯ
X 化を達成するものである。That is, the distribution of the air / coal ratio is low on the inner peripheral wall side in the supply pipe and the air / coal ratio is high on the center side by the pulverized coal concentration adjusting means provided on the upstream side in the pulverized coal supply pipe. Based on the bends on the upstream side, etc., the deviation of the concentration of pulverized coal generated in the circumferential direction in the pulverized coal supply pipe is corrected and uniformized, and stable ignition, flame holding and flammability are ensured, while downstream Excessive swirling components are reduced by the pulverized coal swirl degree adjustment means provided on the side, and the pulverized coal charged into the furnace is mixed with the secondary and tertiary air at an early stage by being charged into the furnace at an optimum swirl angle. And low NO
X is achieved.
【００２８】図１１および図１２は、いずれも上流側に
微粉炭濃度調整手段を有し、その下流側に一方は微粉炭
旋回度調整手段を設けず、他方は微粉炭旋回度調整手段
を設けた場合の、燃焼炉内における微粉炭の微粉炭バー
ナの軸と垂直方向の広がりの挙動を示す図である。図１
１は微粉炭旋回度調整手段を設けない場合の挙動を示す
もので、微粉炭は強い旋回力を有したまま燃焼室に流入
することにより大きく広がっているのに対して、微粉炭
旋回度調整手段を設けた場合には図１２に示すように、
微粉炭は旋回力を調整されて外縁部に空気／石炭比の小
さい領域が形成されることにより、まとまった形状を呈
している。FIGS. 11 and 12 both show a pulverized coal concentration adjusting means on the upstream side, one of which is not provided with the pulverized coal turning degree adjusting means, and the other is provided with the pulverized coal turning degree adjusting means on the downstream side. FIG. 5 is a view showing a behavior of pulverized coal spreading in a direction perpendicular to an axis of a pulverized coal burner in a combustion furnace in a case where the pulverized coal is burned. FIG.
Numeral 1 shows the behavior in the case where the pulverized coal swirl degree adjusting means is not provided. The pulverized coal spreads greatly while flowing into the combustion chamber while having a strong swirl force, whereas the pulverized coal swirl degree adjustment means is used. When the means is provided, as shown in FIG.
The pulverized coal has a united shape by adjusting the swirling force and forming a region having a small air / coal ratio at the outer edge.
【００２９】図１は本願発明の実施の形態を示す微粉炭
バーナの概略断面図である。図１において、１は微粉炭
バーナ、２はボイラ燃焼室、３は微粉炭供給管、４は２
次空気供給管、５はバーナスロート、６は２次空気そら
せ板、７は３次空気そらせ板、８はベンド部、９は旋回
度調整羽根、１０は液体燃料噴射管、１１は液体燃料噴
射管挿入管、１２は２次空気旋回器、１３は３次空気旋
回器、１４は旋回羽根、１５は微粉炭供給管、１６は微
粉炭・搬送用空気、１７は２次空気、１８は３次空気で
ある。FIG. 1 is a schematic sectional view of a pulverized coal burner showing an embodiment of the present invention. In FIG. 1, 1 is a pulverized coal burner, 2 is a boiler combustion chamber, 3 is a pulverized coal supply pipe, 4 is 2
Secondary air supply pipe, 5 is a burner throat, 6 is a secondary air deflector, 7 is a tertiary air deflector, 8 is a bend section, 9 is a swirl degree adjusting blade, 10 is a liquid fuel injection pipe, and 11 is a liquid fuel injection. Pipe insertion pipe, 12 is a secondary air swirler, 13 is a tertiary air swirler, 14 is a swirl vane, 15 is a pulverized coal supply pipe, 16 is pulverized coal / transport air, 17 is secondary air, and 18 is 3 Next is air.
【００３０】石炭粉砕機で粉砕された微粉炭は微粉炭供
給配管１５を通じて搬送用空気中に浮遊した状態で微粉
炭ベンド部８に流入する。ベンド部８に流入した微粉炭
・搬送用空気はほぼ直角に方向を転換して微粉炭供給管
３内に流入する。流入した微粉炭・搬送用空気は微粉炭
供給管３内に設けられた旋回羽根１４からなる微粉炭濃
度調整手段による旋回機能により微粉炭が微粉炭供給管
３内の内壁面側に押しやられ、内壁面側の空気／石炭比
が低められるとともに、微粉炭供給管３の軸心と垂直な
断面における円周方向の分布においても、均一化した濃
度分布の空気・微粉炭の流れを形成する。The pulverized coal pulverized by the coal pulverizer flows into the pulverized coal bend unit 8 through the pulverized coal supply pipe 15 in a state of floating in the air for conveyance. The pulverized coal / conveying air that has flowed into the bend unit 8 changes its direction at a substantially right angle and flows into the pulverized coal supply pipe 3. The pulverized coal and the air for conveyance are pushed to the inner wall surface side in the pulverized coal supply pipe 3 by the swirling function of the pulverized coal concentration adjusting means including the swirling blades 14 provided in the pulverized coal supply pipe 3, The air / coal ratio on the inner wall surface side is lowered, and the distribution of air / pulverized coal having a uniform concentration distribution is formed in the circumferential distribution in a cross section perpendicular to the axis of the pulverized coal supply pipe 3.
【００３１】旋回成分を付与された微粉炭と搬送用空気
は微粉炭供給管３内を更に下流側に流れ、バーナ先端部
近傍に設けられた旋回度調整羽根９からなる微粉炭旋回
度調整手段によって旋回度を低減され、調整されたのち
燃焼炉内に投入される。The pulverized coal to which the swirling component has been imparted and the conveying air flow further downstream in the pulverized coal supply pipe 3, and the pulverized coal swirling degree adjusting means comprising a swirling degree adjusting blade 9 provided near the tip of the burner. The swirling degree is reduced by this, and after being adjusted, it is charged into the combustion furnace.
【００３２】図１においては旋回度調整羽根９は微粉炭
供給管３の内壁面から微粉炭供給管３の軸心方向に向か
って比較的低い高さのものを設けた例を示しているが、
この旋回度調整羽根９の高さは微粉炭供給管３の内壁面
側から、該羽根９のバーナ半径方向軸心側端部が微粉炭
供給管３の軸心に到達しない範囲内で十分長く形成され
たものを設けることも可能である。一方、旋回羽根１４
は微粉炭供給管３の内壁面から微粉炭供給管３の中心側
に配設された液体燃料噴射管挿入管１１の外周部まで全
域にわたって設けた例を示しているが、これはそれぞれ
の条件に対応させて微粉炭供給管３の内壁面から微粉炭
供給管３の中心に向かう半径方向の高さを随時選択して
定めることも可能である。FIG. 1 shows an example in which the swirl degree adjusting blade 9 has a relatively low height from the inner wall surface of the pulverized coal supply pipe 3 toward the axial center of the pulverized coal supply pipe 3. ,
The height of the swirl degree adjusting blade 9 is sufficiently long from the inner wall surface side of the pulverized coal supply pipe 3 as long as the end of the blade 9 on the burner radial axis side does not reach the axis of the pulverized coal supply pipe 3. It is also possible to provide a formed one. On the other hand, the turning blade 14
Shows an example in which the entire area is provided from the inner wall surface of the pulverized coal supply pipe 3 to the outer peripheral portion of the liquid fuel injection pipe insertion pipe 11 arranged on the center side of the pulverized coal supply pipe 3. The height in the radial direction from the inner wall surface of the pulverized coal supply pipe 3 toward the center of the pulverized coal supply pipe 3 can be selected and determined as needed.
【００３３】燃焼用空気の一部である２次空気は、微粉
炭供給管３の外周部と２次空気供給管４のバーナ中心側
の面とで形成される流路を通って燃焼炉２内に投入され
る。３次空気は２次空気供給管４の反バーナ中心側の面
とバーナスロート５のバーナ側の面とによって形成され
る流路を通じて燃焼炉１内に送入される。図１において
は微粉炭供給管３の中心部に液体燃料用の燃料噴射管１
０の挿入管１１が設けられているが、この部分の有無は
本願発明にとって必要不可欠なものではない。The secondary air, which is a part of the combustion air, passes through a flow path formed by the outer peripheral portion of the pulverized coal supply pipe 3 and the surface of the secondary air supply pipe 4 on the center side of the burner. It is thrown in. The tertiary air is fed into the combustion furnace 1 through a flow path formed by a surface of the secondary air supply pipe 4 on the side opposite to the burner and a surface of the burner throat 5 on the side of the burner. In FIG. 1, a fuel injection pipe 1 for liquid fuel is provided at the center of the pulverized coal supply pipe 3.
Although a zero insertion tube 11 is provided, the presence or absence of this portion is not essential for the present invention.
【００３４】図２は他の実施の形態を示す微粉炭バーナ
の概略断面図である。図２においては図１と共通するも
のについては図１と同じ符号を付してある。該実施の形
態は、前記実施の形態における液体燃料噴射管挿入管１
１の部分に燃焼用空気の一部（コアーエア）を流通させ
るコアーエア供給管２０を設けた構造の微粉炭バーナ１
において、微粉炭供給管３内上流側の微粉炭供給管３内
壁面側に旋回羽根１４を設け、微粉炭供給管３内の内壁
面側に空気／石炭比の小さい領域を形成させるとともに
微粉炭供給管３内壁部円周方向の微粉炭濃度を均一化
し、微粉炭供給管３下流側に設けた旋回度調整羽根９に
よって過度の旋回分を減じたもので、この場合にも前記
実施の形態の場合と同様の優れた着火・保炎性を得る事
が可能である。FIG. 2 is a schematic sectional view of a pulverized coal burner showing another embodiment. In FIG. 2, components common to FIG. 1 are denoted by the same reference numerals as in FIG. In this embodiment, the liquid fuel injection pipe insertion pipe 1
Pulverized coal burner 1 having a structure in which a core air supply pipe 20 for circulating a part of the combustion air (core air) is provided in part 1
In the pulverized coal supply pipe 3, a swirling blade 14 is provided on the inner wall surface side of the pulverized coal supply pipe 3 on the upstream side to form a region having a small air / coal ratio on the inner wall surface side of the pulverized coal supply pipe 3. The pulverized coal concentration in the circumferential direction of the inner wall of the supply pipe 3 is made uniform, and the excessive swirl is reduced by the swirl degree adjusting blade 9 provided on the downstream side of the pulverized coal supply pipe 3. It is possible to obtain the same excellent ignition and flame holding properties as in the case of (1).
【００３５】図１および図２に示す旋回羽根は、微粉炭
供給管の内壁面に接して摺動可能とし、あるいは旋回羽
根の角度，旋回羽根の高さ等を調節可能とし、該旋回羽
根を微粉炭バーナの外部から手動あるいは電気、圧縮空
気、油圧等の動力によって駆動して微粉炭バーナの軸方
向に移動させ、あるいは旋回羽根の角度，高さ等を変化
させることにより、微粉炭の炭種あるいは負荷に応じて
それを適宜調節して更に効果的な着火・保炎性を確保す
ることが可能になる。The swirl vane shown in FIGS. 1 and 2 can be slid in contact with the inner wall surface of the pulverized coal supply pipe, or the swirl vane angle, the height of the swirl vane and the like can be adjusted. By moving the pulverized coal burner in the axial direction by driving it manually or by power such as electricity, compressed air, or hydraulic pressure from outside the pulverized coal burner, or by changing the angle and height of the swirling blades, the pulverized coal is burned. It is possible to secure more effective ignition / flame holding properties by appropriately adjusting it according to species or load.
【００３６】また微粉炭旋回度調整手段を、微粉炭供給
管の内壁面に接して摺動可能な複数の羽根からなる旋回
度調整羽根構造とし、あるいは旋回度調整羽根の羽根の
角度，高さ等を調節可能とし、該旋回度調整羽根を微粉
炭バーナの外部から手動あるいは電気、圧縮空気、油圧
等の動力によって駆動して微粉炭バーナの軸方向に適宜
移動させ、あるいは調整羽根の角度，高さ等を調節する
ことにより、微粉炭の炭種あるいは負荷に応じてそれを
調節して更に効果的な着火・保炎性を確保することが可
能になる。The pulverized coal swirl degree adjusting means may be a swirl degree adjusting blade structure comprising a plurality of blades slidable in contact with an inner wall surface of the pulverized coal supply pipe, or an angle and a height of the swirl degree adjusting blade. And the like, and the turning degree adjusting blade is manually or externally driven from the pulverized coal burner by a power such as electric power, compressed air, or hydraulic pressure, and is appropriately moved in the axial direction of the pulverized coal burner. By adjusting the height or the like, it becomes possible to secure more effective ignition and flame holding properties by adjusting the height or the like in accordance with the type or load of the pulverized coal.
【００３７】微粉炭濃度調整手段および微粉炭旋回度調
整手段は、いずれも固定式であっても極めて顕著な着火
・保炎性を得ることができるが、両手段のいずれか一方
あるいは両方を上記ように移動あるいは調節可能とし、
それらを適宜併用することによってより一層的確な燃焼
を得ることが可能になる。The pulverized coal concentration adjusting means and the pulverized coal swirl degree adjusting means can obtain extremely remarkable ignition / flame holding properties even if both are fixed types. So that it can be moved or adjusted,
By appropriately using them, more accurate combustion can be obtained.
【００３８】図３は旋回羽根の実施の形態を示す図で、
液体燃料噴射管挿入管１１等を挿通させて摺動自在と
し、あるいは液体燃料噴射管挿入管１１等を挿通させて
固定される管２２の外周部に、管２２の軸心と所定の角
度を保持して植設して形成された複数の旋回羽根２３か
らなり、（ａ）はその正面図、（ｂ）はその側面図であ
る。FIG. 3 is a view showing an embodiment of the swirling blade.
A predetermined angle with respect to the axis of the pipe 22 is provided on the outer peripheral portion of the pipe 22 fixed by inserting the liquid fuel injection pipe insertion pipe 11 or the like by inserting the liquid fuel injection pipe insertion pipe 11 or the like. It is composed of a plurality of swirling blades 23 formed by holding and planting, (a) is a front view thereof, and (b) is a side view thereof.
【００３９】[0039]
【実施例】図４は本願発明者らが実際に試験を行った結
果を示す図である。図４において、従来例Ａは図８に示
す構造の微粉炭バーナであり、従来例Ｂは図８における
構造の微粉炭バーナの先端部に取り付けた保炎器（スワ
ラ）の角度を小さくして微粉炭のバーナ出口部における
旋回度を緩めたものである。その結果、従来例Ｂのバー
ナは従来例Ａのバーナに比して全般に火炎の形状もよ
く、またＮＯX も低い値が得られたものの低負荷時にお
いて燃焼が不安定なものであった。FIG. 4 is a diagram showing the results of an actual test conducted by the inventors of the present invention. In FIG. 4, Conventional Example A is a pulverized coal burner having the structure shown in FIG. 8, and Conventional Example B is formed by reducing the angle of a flame stabilizer (swirler) attached to the tip of the pulverized coal burner having the structure shown in FIG. The degree of rotation of the pulverized coal at the burner outlet is reduced. As a result, the burner of the conventional example B was as combustion is unstable in the conventional example flame shape in general than the burner A is good, also the low-load those NO X even lower values were obtained .
【００４０】それに対して本願発明に基づく安定着火・
保炎・低ＮＯX バーナによれば、火炎の形状を従来例Ｂ
の時と同様に安定したものにし得るとともに、二段燃焼
割合を約３５％から約２５％に低下させた条件で低ＮＯ
X 化を行うことを可能とし、ボイラにおけるフライアッ
シュ中の灰中未燃灰分の低減、炉壁の耐久性の面なども
非常に好適なものとなし得た。On the other hand, the stable ignition based on the present invention
According to flame stabilization and low NO X burner, the shape of the flame prior art B
And a low NO under the condition that the two-stage combustion ratio is reduced from about 35% to about 25%.
X conversion was possible, and the reduction of unburned ash content in ash in fly ash in a boiler and the durability of furnace walls were also very favorable.
【００４１】[0041]
【発明の効果】以上述べたように、本願発明によれば次
のような効果を発揮できる。 （１）安定着火・保炎に対する効果 微粉炭供給管の上流部に微粉炭の濃度調整手段を設ける
ことにより、微粉炭供給管内の内壁面側の空気／石炭比
を低減して着火・保炎性を向上させ、ボイラの負荷対応
範囲を広げることが可能になる。本願発明に基づくバー
ナと、従来型バーナ２形式の安定着火可能な空気／石炭
比の上限を大型燃焼試験炉によって確認した結果、平均
の空気／石炭比で本願発明に基づくバーナが３．７５、
従来型Ａが２．８、従来型Ｂが２．３であり、大きな改
善がみられた。従来型Ａは安定着火に配慮したものであ
るがＮＯX 発生が多く、従来型Ｂは逆に低ＮＯX に配慮
したもので、安定着火に劣るものである。As described above, according to the present invention, the following effects can be obtained. (1) Effect on stable ignition and flame holding By providing a means for adjusting the concentration of pulverized coal upstream of the pulverized coal supply pipe, the air / coal ratio on the inner wall surface side in the pulverized coal supply pipe is reduced to cause ignition and flame holding. Performance can be improved, and the range of the boiler that can handle the load can be expanded. As a result of confirming the burner based on the present invention and the upper limit of the air / coal ratio capable of stably igniting the two types of the conventional burner using a large combustion test furnace, the burner based on the present invention was 3.75 at the average air / coal ratio,
The conventional type A was 2.8 and the conventional type B was 2.3, showing a great improvement. Conventional A stable ignition in which conscious but NO X generation number, the conventional B which was friendly contrary to the low NO X, in which less stable ignition.
【００４２】（２）微粉炭供給管内での微粉炭の片寄り
の改善効果 ベンド部による微粉炭の管の周方向の片寄りを解消する
ことにより、炉内火炎を同心円状にして燃焼性を安定さ
せるとともに、２，３次空気との混合も周方向のアンバ
ランスを減少し、燃焼室壁への伝熱性の面からも良い条
件を提供することが可能になる。(2) Effect of Improving Pulverized Coal Deviation in Pulverized Coal Supply Pipe By eliminating the deviation of the pulverized coal pipe in the circumferential direction due to the bend portion, the flame in the furnace is made concentric and the combustibility is improved. In addition to stabilization, the mixing with the secondary and tertiary air also reduces the imbalance in the circumferential direction, and provides good conditions in terms of heat transfer to the combustion chamber wall.
【００４３】（３）低ＮＯX 化の改善効果 上流部に微粉炭濃度調整手段を設けることによって得ら
れる上記（１）、（２）記載の効果の反面、微粉炭濃度
調整手段を付与したのみでは、炉内に投入された微粉炭
と搬送用空気は炉内で半径方向に過度に広がり低ＮＯX
化に不都合となる。そのため、微粉炭濃度調整手段の下
流側、望ましくは、バーナの先端の近くに微粉炭旋回度
調整手段を設けて、微粉炭濃度調整手段で付与された旋
回度を減じ最適な旋回度によって微粉炭と搬送用空気を
炉内に投入することで低ＮＯX 化が達成できる。[0043] (3) above is obtained by providing the pulverized coal concentration adjustment means improvement upstream portion of the low NO X reduction (1), only granted (2) although the effects described, the pulverized coal concentration adjusting means in, the conveying air pulverized coal thrown into the furnace spread excessively in the radial direction in the furnace low NO X
Inconvenience. Therefore, a pulverized coal turning degree adjusting means is provided downstream of the pulverized coal concentration adjusting means, desirably, near the tip of the burner, and the turning degree given by the pulverized coal concentration adjusting means is reduced to obtain the pulverized coal with an optimum turning degree. low NO X reduction can be achieved by injecting a conveying air into the furnace and.
【図１】本願発明の実施の形態を示す微粉炭バーナの概
略断面図である。FIG. 1 is a schematic sectional view of a pulverized coal burner showing an embodiment of the present invention.
【図２】他の実施の形態を示す微粉炭バーナの概略断面
図である。FIG. 2 is a schematic sectional view of a pulverized coal burner showing another embodiment.
【図３】旋回羽根の実施の形態を示す図である。FIG. 3 is a diagram showing an embodiment of a swirling blade.
【図４】本願発明を適用したバーナと従来型バーナとの
低ＮＯX 性の比較を示す図である。Figure 4 shows a comparison of the low NO X of the burner and the conventional burner according to the present invention.
【図５】上流側微粉炭供給部にベンド部を有し、ベンド
部の下流側に微粉炭濃度調整手段を設けた場合の微粉炭
供給管内の微粉炭濃度分布の３次元固・気二相流解析結
果を示す図である。FIG. 5 shows a three-dimensional solid / gas two-phase distribution of a pulverized coal concentration distribution in a pulverized coal supply pipe in a case where a pulverized coal supply section has a bend portion in a pulverized coal supply section and a pulverized coal concentration control means is provided downstream of the bend portion It is a figure showing a flow analysis result.
【図６】上流側微粉炭供給部にベンド部を有し、ベンド
部下流側に微粉炭濃度調整手段を設けない場合の微粉炭
供給管内の微粉炭濃度分布の３次元固・気二相流解析結
果を示す図である。FIG. 6 shows a three-dimensional solid / gas two-phase flow of pulverized coal concentration distribution in a pulverized coal supply pipe in a case where a pulverized coal supply section has a bend portion and a pulverized coal concentration adjusting means is not provided downstream of the bend portion. It is a figure showing an analysis result.
【図７】微粉炭ボイラの燃料供給設備のシステム構成の
概略を示す図である。FIG. 7 is a diagram schematically illustrating a system configuration of a fuel supply facility of a pulverized coal boiler.
【図８】従来の微粉炭バーナの概略断面図である。FIG. 8 is a schematic sectional view of a conventional pulverized coal burner.
【図９】空気／石炭比と着火・保炎性との関係を示す図
である。FIG. 9 is a diagram showing a relationship between an air / coal ratio and ignition / flame holding properties.
【図１０】石炭粉砕機の負荷と空気／石炭比との関係を
示す図である。FIG. 10 is a diagram showing a relationship between a load of a coal crusher and an air / coal ratio.
【図１１】上流側に微粉炭濃度調整手段を設け、下流側
に微粉炭旋回度調整手段を設けない場合の微粉炭の挙動
を示す図である。FIG. 11 is a diagram showing the behavior of pulverized coal in the case where the pulverized coal concentration adjusting means is provided on the upstream side and the pulverized coal turning degree adjusting means is not provided on the downstream side.
【図１２】上流側に微粉炭濃度調整手段を設け、下流側
に微粉炭旋回度調整手段を設けた場合の微粉炭の挙動を
示す図である。FIG. 12 is a diagram showing the behavior of pulverized coal when pulverized coal concentration adjusting means is provided on the upstream side and pulverized coal turning degree adjusting means is provided on the downstream side.
１ 微粉炭バーナ ２ 燃焼炉 ３ 微粉炭供給管 ４ ２次空気供給管 ５ バーナスロート ６ ２次空気そらせ板 ７ ３次空気そらせ板 ８ ベンド部 ９ 旋回度調整羽根 １０ 液体燃料噴射管 １１ 液体燃料噴射管挿入管 １２ ２次空気旋回路 １３ ３次空気旋回路 １４ 旋回羽根 １５ 微粉炭供給配管 １６ 微粉炭・搬送用空気 １７ ２次空気 １８ ３次空気 ２０ コアーエア供給管 ２２ 管 ２３ 旋回羽根 １０１ 微粉炭バーナ １０２ 燃焼炉 １０３ 微粉炭供給管 １０４ ２次空気供給管 １０５ バーナスロート １０６ ２次空気そらせ板 １０７ ３次空気そらせ板 １０８ ベンド部 １０９ 保炎器（スワラ） １１０ 液体燃料噴射管 １１１ 液体燃料噴射管挿入管 １１２ ２次空気旋回器 １１３ ３次空気旋回器 １１５ 微粉炭供給配管 １１６ 微粉炭・搬送用空気 １１７ ２次空気 １１８ ３次空気 ９０１ ボイラ ９０２ 燃焼用空気送風機 ９０３ 石炭粉砕機 ９０４ 微粉炭搬送用空気送風機 ９０５ 微粉炭バーナ ９０６ 微粉炭供給管 ９０７ 微粉炭供給配管 ９０８ 石炭供給管 ９１０ 微粉炭搬送用空気管 REFERENCE SIGNS LIST 1 pulverized coal burner 2 combustion furnace 3 pulverized coal supply pipe 4 secondary air supply pipe 5 burner throat 6 secondary air deflector 7 tertiary air deflector 8 bend section 9 swirl degree adjusting blade 10 liquid fuel injection pipe 11 liquid fuel injection Pipe insertion pipe 12 Secondary air swirl circuit 13 Tertiary air swirl circuit 14 Swirl vane 15 Pulverized coal supply piping 16 Pulverized coal / transport air 17 Secondary air 18 Tertiary air 20 Core air supply pipe 22 Pipe 23 Swirl vane 101 Pulverized coal Burner 102 Combustion furnace 103 Pulverized coal supply pipe 104 Secondary air supply pipe 105 Burner throat 106 Secondary air deflector 107 Tertiary air deflector 108 Bend unit 109 Flame stabilizer (swirler) 110 Liquid fuel injection pipe 111 Liquid fuel injection pipe Insertion pipe 112 Secondary air swirler 113 Tertiary air swirler 115 Pulverized coal supply piping 116 Pulverized coal / empty for conveyance 117 secondary air 118 tertiary air 901 boiler 902 combustion air blower 903 coal pulverizer 904 pulverized coal transport air blower 905 pulverized coal burner 906 pulverized coal supply pipe 907 pulverized coal supply pipe 908 coal supply pipe 910 pulverized coal transport air tube
フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｆ２３Ｄ 1/02 Ｆ２３Ｄ 1/02 Ｚ (72)発明者 田部 裕 東京都江東区南砂２丁目11番１号 川崎 重工業株式会社 東京設計事務所内 (72)発明者 西村 元彦 東京都江東区南砂２丁目６番５号 川崎 重工業株式会社 東京設計事務所内 (72)発明者 蔵田 親利 東京都江東区南砂２丁目11番１号 川崎 重工業株式会社 東京設計事務所内 (72)発明者 ▲広▼川 雅俊 兵庫県明石市川崎町１番１号 川崎重工 業株式会社 明石技術研究所内 (72)発明者 井上 健司 兵庫県明石市川崎町１番１号 川崎重工 業株式会社 明石技術研究所内 (72)発明者 白羽 陸宏 東京都江東区南砂２丁目11番１号 川崎 重工業株式会社 東京設計事務所内 (56)参考文献 特開 昭58−224208（ＪＰ，Ａ) 特開 平３−241208（ＪＰ，Ａ) 特開 平２−122103（ＪＰ，Ａ) 実開 平６−46117（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) F23D 1/00 F23C 11/00 F23D 1/02Continued on the front page (51) Int.Cl. 6 Identification code FI F23D 1/02 F23D 1/02 Z (72) Inventor Hiroshi Tabe 2-1-1, Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries, Ltd. Tokyo Design Office (72) Inventor Motohiko Nishimura 2-6-5 Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries, Ltd. Tokyo design office (72) Inventor Kurata Chitoshi 2-1-1 Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries, Ltd. Tokyo Inside the design office (72) Inventor ▲ Hiro ▼ Masatoshi Kawai 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd. (72) Inventor Rikuhiro Shiraba 2-1-1, Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries, Ltd. Tokyo Design Office (56) References JP-A-58-224208 (JP, A JP-A-3-241208 (JP, A) JP-A-2-122103 (JP, A) Hei 6-46117 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) F23D 1/00 F23C 11/00 F23D 1/02
Claims (9)
燃焼炉内に投入し、別途投入される空気または酸化材と
合わせて燃焼反応を行わせるボイラの微粉炭バーナにお
いて、 微粉炭供給管内軸心部に液体燃料噴射管挿入管を挿通さ
せ、 該挿入管の上流側の所定位置に複数の板状羽根を管の外
周部かつ軸心と所定の角度でバーナの半径方向に植設し
た旋回羽根を挿通固定して 微粉炭を微粉炭供給管の内周
壁側に集中的に濃縮させるとともに該供給管内の周方向
の微粉炭の濃度分布を均一化させる微粉炭濃度調整手段
となし、 微粉炭供給管内壁側下流先端部近傍に、複数の羽根を該
供給管の軸心とほぼ平行に設けて上流側から流入する微
粉炭流の旋回度を減じて燃焼炉内に投入させる微粉炭旋
回度調整手段となしたことを特徴とする微粉炭バーナ。1. A pulverized coal is transported by a gas such as air,
Was charged into the combustion furnace, you separately pulverized coal burner of the inserted are boiler causes the combustion reaction together with the air or an oxidizing material
And insert the liquid fuel injection pipe insertion pipe into the axial center of the pulverized coal supply pipe.
At a predetermined position on the upstream side of the insertion tube, a plurality of plate-like blades
Planted in the radial direction of the burner at a predetermined angle with the circumference and the axis
Pulverized coal concentration adjustment means for the inserted and fixed to the pulverized coal swirl vane causes intensively concentrated on the inner peripheral wall side of the pulverized coal supply pipe uniform the density distribution in the circumferential direction of the pulverized coal of the supply pipe was
A plurality of blades are provided near the downstream end on the inner wall side of the pulverized coal supply pipe.
The microfluid that is provided almost parallel to the axis of the supply pipe and flows in from the upstream
A pulverized coal burner characterized in that it is a pulverized coal swirl degree adjusting means for reducing the swirl degree of the pulverized coal stream and introducing it into the combustion furnace.
半径方向反軸心側端部が、微粉炭供給管の内周壁に達す
るものである請求項１記載の微粉炭バーナ。2. A burner for a plate-like blade of a pulverized coal concentration adjusting means.
The end opposite to the radial center axis reaches the inner peripheral wall of the pulverized coal supply pipe.
It shall be pulverized coal burner according to claim 1, wherein.
羽根のバーナ半径方向軸心側端部が、微粉炭供給管の軸
心に到達しない範囲内の寸法に形成される請求項１〜２
のうちいずれか１項に記載の微粉炭バーナ。3. The blade height of the pulverized coal swirl degree adjusting means is:
The end of the blade on the burner radial axis side is the shaft of the pulverized coal supply pipe.
3. The size formed in a range that does not reach the heart.
The pulverized coal burner according to any one of the above.
手段が両方とも固定されたものである請求項１〜３項の
うちいずれか１項に記載の微粉炭バーナ。4. Pulverized coal swirl degree adjusting means and pulverized coal concentration adjustment.
4. The method according to claim 1, wherein both means are fixed.
A pulverized coal burner according to any one of the preceding claims.
手段がいずれか一方が調節可能なものである請求項１〜
３項のうちいずれか１項に記載の微粉炭バーナ。5. Pulverized coal swirl degree adjusting means and pulverized coal concentration adjustment.
The means is one of which is adjustable.
The pulverized coal burner according to any one of the three items .
手段の両方とも調節可能なものである請求項１〜３項の
うちいずれか１項に記載の微粉炭バーナ。6. The pulverized coal turning degree adjusting means and the pulverized coal concentration adjusting means are both adjustable.
A pulverized coal burner according to any one of the preceding claims.
に移動可能なものである請求項１〜３項のうちいずれか
１項に記載の微粉炭バーナ。7. The pulverized coal concentration adjusting means is in a direction parallel to the axis.
Any one of claims 1 to 3 which can be moved to
A pulverized coal burner according to claim 1.
向に移動可能なものである請求項１〜３項のうちのいず
れか１項に記載の微粉炭バーナ。8. The method in which the pulverized coal swirl degree adjusting means is parallel to the axis.
Any one of claims 1 to 3 which is movable in
The pulverized coal burner according to claim 1.
手段の両方が軸心と平行な方向に移動可能なものである
請求項１〜３項のうちいずれか１項に記載の微粉炭バー
ナ。 Both 9. pulverized coal pivot adjustment means and pulverized coal concentration adjustment means is capable moving in the axial direction parallel
The pulverized coal burner according to any one of claims 1 to 3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7179272A JP2756098B2 (en) | 1995-07-14 | 1995-07-14 | Pulverized coal burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7179272A JP2756098B2 (en) | 1995-07-14 | 1995-07-14 | Pulverized coal burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0926112A JPH0926112A (en) | 1997-01-28 |
| JP2756098B2 true JP2756098B2 (en) | 1998-05-25 |
Family
ID=16062946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7179272A Expired - Lifetime JP2756098B2 (en) | 1995-07-14 | 1995-07-14 | Pulverized coal burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2756098B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58224208A (en) * | 1982-06-19 | 1983-12-26 | Babcock Hitachi Kk | Uniform dispersion type pulverized coal firing equipment |
| JP2752107B2 (en) * | 1988-10-31 | 1998-05-18 | バブコツク日立株式会社 | Combustion device for particulate fuel |
| JP2698464B2 (en) * | 1990-02-15 | 1998-01-19 | 財団法人電力中央研究所 | Pulverized coal burner |
| JPH0646117U (en) * | 1992-11-10 | 1994-06-24 | 石川島播磨重工業株式会社 | Pulverized coal burner |
-
1995
- 1995-07-14 JP JP7179272A patent/JP2756098B2/en not_active Expired - Lifetime
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| KR20180022909A (en) | 2015-06-30 | 2018-03-06 | 미츠비시 히타치 파워 시스템즈 가부시키가이샤 | Solid fuel burner |
| KR101962583B1 (en) | 2015-06-30 | 2019-07-17 | 미츠비시 히타치 파워 시스템즈 가부시키가이샤 | Solid fuel burner |
| US10731850B2 (en) | 2015-06-30 | 2020-08-04 | Mitsubishi Hitachi Power Systems, Ltd. | Solid fuel burner |
| WO2020179593A1 (en) * | 2019-03-01 | 2020-09-10 | 三菱日立パワーシステムズ株式会社 | Solid fuel burner |
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| JPWO2020179593A1 (en) * | 2019-03-01 | 2021-12-16 | 三菱パワー株式会社 | Solid fuel burner |
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| Publication number | Publication date |
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| JPH0926112A (en) | 1997-01-28 |
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