JPH08135920A - Pulverized-coal burner - Google Patents
Pulverized-coal burnerInfo
- Publication number
- JPH08135920A JPH08135920A JP6279102A JP27910294A JPH08135920A JP H08135920 A JPH08135920 A JP H08135920A JP 6279102 A JP6279102 A JP 6279102A JP 27910294 A JP27910294 A JP 27910294A JP H08135920 A JPH08135920 A JP H08135920A
- Authority
- JP
- Japan
- Prior art keywords
- air
- pulverized coal
- tip
- mixture
- pulverized
- 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その他、産業
用の微粉炭焚きボイラに適用され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 applied to a pulverized coal burning boiler for power generation business and other industries.
【０００２】[0002]
【従来の技術】図６は本発明の前提となる従来の丸型微
粉炭バーナの一例を示す縦断側面図、図７は同じく正面
図、図８は図６のVIII−VIII横断面図である。このバー
ナは、軸心部に助燃用のオイルガン（０１）が配置さ
れ、それを囲んで外周をオイル１次空気管（０２）で仕
切られたオイル１次空気流路（１３），その外側に外周
を１次空気管（０３）で仕切られた微粉炭と１次空気の
混合気流路（１４），そのまた外側に外周を２次空気管
（０４）で仕切られた２次空気流路（１５），更にその
外側に外周を外筒で仕切られた３次空気流路（１６）が
設けられる。2. Description of the Related Art FIG. 6 is a vertical sectional side view showing an example of a conventional round type pulverized coal burner which is a premise of the present invention, FIG. 7 is a front view of the same, and FIG. 8 is a transverse sectional view of VIII-VIII of FIG. . In this burner, an oil gun (01) for auxiliary combustion is arranged at the axial center part, and an oil primary air flow path (13) is surrounded by the oil gun (01) and is surrounded by an oil primary air pipe (02), and the outside thereof. A mixture air flow passage (14) of pulverized coal and primary air whose outer periphery is partitioned by a primary air pipe (03), and a secondary air flow passage whose outer periphery is partitioned by a secondary air pipe (04) on the outside (15) Further, a tertiary air flow path (16) having an outer periphery partitioned by an outer cylinder is provided on the outer side thereof.
【０００３】オイル１次空気流路（１３）の先端部に
は、重油火炎の保炎を維持するために旋回羽根（０５）
が設置されている。オイル１次空気は、重油焚き上げ時
あるいは助燃時の補助空気として、全空気量の５％ない
し１０％供給される。A swirl vane (05) is provided at the tip of the oil primary air flow path (13) for maintaining the flame holding of the heavy oil flame.
Is installed. The primary oil oil is supplied as 5% to 10% of the total air amount as auxiliary air at the time of burning heavy oil or at the time of auxiliary combustion.
【０００４】主燃焼用の２次空気と３次空気は、空気風
箱（０９）内で２次空気と３次空気に区分される。２次
空気は、２次空気旋回羽根（０７）により所定の旋回力
を付与された後、２次空気流路（１５）を通り、２次空
気ノズル（１８）から炉内に供給される。同様に３次空
気も、３次空気旋回羽根（０８）により所定の旋回力を
付与された後、３次空気流路（１６）を通り、３次空気
ノズル（１９）から炉内に供給される。Secondary air and tertiary air for main combustion are divided into secondary air and tertiary air in the air box (09). The secondary air is supplied with a predetermined swirling force by the secondary air swirl vane (07), then passes through the secondary air flow path (15), and is supplied from the secondary air nozzle (18) into the furnace. Similarly, the tertiary air is also supplied with a predetermined swirling force by the tertiary air swirl vane (08), then passes through the tertiary air flow path (16) and is supplied into the furnace from the tertiary air nozzle (19). It
【０００５】一方、主燃料である微粉炭は、図８に示さ
れるように１次空気管（０３）に直交して接続された微
粉炭供給管（１１）を介して、搬送用の１次空気と共に
バーナに供給され、混合気流路（１４）を通り微粉炭ノ
ズル（１７）から炉内に供給される。微粉炭ノズル（１
７）から噴出した微粉炭は、周囲の輻射熱により着火
後、前記２次空気および３次空気と拡散混合しながら燃
焼し、更に火炉後流域に設けられた図示していないアフ
ターエアポートからの空気により完全燃焼する。On the other hand, the pulverized coal, which is the main fuel, is transported through the pulverized coal supply pipe (11) connected orthogonally to the primary air pipe (03) as shown in FIG. It is supplied to the burner together with air, and is supplied into the furnace from the pulverized coal nozzle (17) through the air-fuel mixture flow path (14). Pulverized coal nozzle (1
The pulverized coal ejected from 7) is ignited by radiant heat of the surroundings, burns while diffusively mixing with the secondary air and the tertiary air, and further by air from an after-air port (not shown) provided in the downstream region of the furnace. Burns completely.
【０００６】なお、１次空気と微粉炭との混合気流路
（１４）の外周部に相当する２次空気ノズル（１８）の
先端には、微粉炭火炎の保炎を維持するために、保炎板
（０６）が設けられている。At the tip of the secondary air nozzle (18) corresponding to the outer peripheral portion of the air-fuel mixture flow path (14) of the primary air and pulverized coal, a pulverized coal flame is maintained in order to maintain it. A flame plate (06) is provided.
【０００７】[0007]
【発明が解決しようとする課題】前記従来例の軸対称丸
型バーナには、次のような解決すべき課題があった。The axisymmetric round burner of the conventional example has the following problems to be solved.
【０００８】１） バーナに供給される微粉炭が１次空
気管（０３）の軸心に対し直交して流入するので、微粉
炭と１次空気の混合気流路（１４）内で偏流を生じ、微
粉炭ノズル（１７）の出口部で微粉炭濃度の周方向分布
が極端に不均一となる。これに伴って、バーナと微粉炭
着火点との距離が周方向に不均一となる。すなわち微粉
炭濃度が高い領域では着火点が近く、低い場合には逆に
着火点は離れる。着火点が不均一となると、着火点が近
い領域ではノズルの焼損が懸念される。また着火点が離
れた領域では、２次空気が既に部分的に拡散するため、
着火点における空気比が高くなって酸化炎が形成され、
ＮＯx の発生量が増大する。1) Since the pulverized coal supplied to the burner flows in at right angles to the axis of the primary air pipe (03), a drift occurs in the mixture channel (14) of the pulverized coal and the primary air. At the outlet of the pulverized coal nozzle (17), the circumferential distribution of the pulverized coal concentration becomes extremely uneven. Along with this, the distance between the burner and the pulverized coal ignition point becomes uneven in the circumferential direction. That is, the ignition point is near in the region where the pulverized coal concentration is high, and conversely the ignition point is away when it is low. If the ignition points become uneven, there is a concern that the nozzle may burn out in the region where the ignition points are close. Also, in the area where the ignition points are distant, the secondary air has already partially diffused,
The air ratio at the ignition point becomes high and an oxidative flame is formed,
The amount of NO x generated increases.
【０００９】２） ２次空気ノズル（１８）と３次空気
ノズル（１９）の炉内側先端位置が微粉炭ノズル（１
７）と同じ位置にあり、かつ各ノズル間の距離が近接し
ているため、２次空気と３次空気がバーナ直後で燃焼火
炎に急激に混合し、ＮＯx の発生量が増大する。また、
微粉炭着火前に２次空気の一部が微粉炭混合気に干渉す
るため、ノズル出口の微粉炭濃度が低くなり、着火が不
安定となる。2) The tip positions of the secondary air nozzle (18) and the tertiary air nozzle (19) inside the furnace are pulverized coal nozzles (1
Since it is located at the same position as 7) and the distances between the nozzles are close to each other, the secondary air and the tertiary air are rapidly mixed with the combustion flame immediately after the burner, and the amount of NO x generated increases. Also,
Since a part of the secondary air interferes with the pulverized coal mixture before ignition of the pulverized coal, the concentration of the pulverized coal at the nozzle outlet becomes low and the ignition becomes unstable.
【００１０】[0010]
【課題を解決するための手段】本発明者は、前記従来の
課題を解決するために、軸心部に配置された助燃用のオ
イルガンと、同オイルガンを囲む環状断面のオイル１次
空気流路と、同オイル１次空気流路を囲む環状断面の微
粉炭と１次空気の混合気流路と、同混合気流路を囲む環
状断面の２次空気流路と、同２次空気流路を囲む環状断
面の３次空気流路とを備え、次の要件（１）ないし
（７）を満たすことを特徴とする微粉炭バーナを提案す
るものである。 （１） 上記混合気流路に対して微粉炭供給管が接線方
向に接続されていること。 （２） 上記微粉炭供給管の先端部に上記混合気の進入
角度を制御する手段が設けられていること。 （３） 上記混合気流路内を外周部と内周部に区画する
仕切管が設けられていること。 （４） 上記外周部には複数のブロックが円周方向に配
置されていること。 （５） 上記内周部には流れを軸線に平行に向ける複数
の整流板が設けられていること。 （６） 上記２次空気流路の先端と上記３次空気流路の
先端とは、上記混合気流路の先端よりも前方に突出して
いること。 （７） 上記３次空気流路の先端部は外に開く方向に向
けられていること。In order to solve the above-mentioned conventional problems, the present inventor has found that an oil gun for auxiliary combustion arranged in an axial center portion and an oil primary air having an annular cross section surrounding the oil gun. A channel, a mixture channel of pulverized coal and primary air in an annular cross section surrounding the oil primary air channel, a secondary air channel in an annular section surrounding the mixture channel, and a secondary air channel The present invention proposes a pulverized coal burner characterized by comprising a tertiary air flow passage having an annular cross section surrounding the above and satisfying the following requirements (1) to (7). (1) A pulverized coal supply pipe is tangentially connected to the mixture channel. (2) A means for controlling the advancing angle of the air-fuel mixture is provided at the tip of the pulverized coal supply pipe. (3) A partition tube that partitions the inside of the mixture channel into an outer peripheral portion and an inner peripheral portion is provided. (4) A plurality of blocks are arranged in the circumferential direction on the outer peripheral portion. (5) A plurality of flow straightening plates that direct the flow parallel to the axis are provided on the inner peripheral portion. (6) The tip of the secondary air channel and the tip of the tertiary air channel project forward of the tip of the mixture channel. (7) The tip of the tertiary air flow path should be oriented in the direction of opening to the outside.
【００１１】[0011]
【作用】本発明は前記のとおり構成され、微粉炭混合気
流路に対して微粉炭供給管が接線方向に接続されている
ので、微粉炭混合気に旋回力が付与され、微粉炭濃度は
混合気流路の外周部で高く、内周部では低くなる。そし
て上記混合気流路内を外周部と内周部に区画する仕切管
が設けられ、更に上記外周部には複数のブロックが円周
方向に配置され、上記内周部には流れを軸線に平行に向
ける複数の整流板が設けられているので、上記のように
旋回によって濃淡に分離された微粉炭混合気は、それぞ
れそのまま上記仕切管により区画された内外の流路に流
入し、複数のブロックや整流板によって旋回を弱めら
れ、火炎の拡大が防止される。また上記ブロックの下流
ではカルマン渦により保炎が強化される。The present invention is configured as described above, and since the pulverized coal supply pipe is tangentially connected to the pulverized coal mixture flow path, a swirling force is imparted to the pulverized coal mixture, and the pulverized coal concentration is mixed. It is high at the outer peripheral portion of the air flow path and low at the inner peripheral portion. A partition pipe that divides the air-fuel mixture flow passage into an outer peripheral portion and an inner peripheral portion is provided, and further, a plurality of blocks are circumferentially arranged in the outer peripheral portion, and the flow is parallel to the axis line in the inner peripheral portion. Since a plurality of straightening vanes facing each other are provided, the pulverized coal air-fuel mixture separated by the swirling as described above flows into the inner and outer flow passages partitioned by the partition pipe, respectively, and the plurality of blocks The slewing is weakened by the straightening vanes and the spread of flame is prevented. Further, the flame holding is strengthened by the Karman vortex downstream of the block.
【００１２】本発明ではまた、上記微粉炭供給管の先端
部に上記混合気の進入角度を制御する手段が設けられて
いるので、微粉炭混合気の旋回力を制御することができ
る。したがって、燃焼負荷が減少して混合気中の微粉炭
濃度が低くなった場合でも、仕切管の外側の流路に微粉
炭を集中させて、その流路の微粉炭濃度を一定に保ち、
着火を安定させることができる。Further, according to the present invention, since the means for controlling the advancing angle of the air-fuel mixture is provided at the tip of the pulverized coal supply pipe, the swirling force of the air-fuel mixture can be controlled. Therefore, even when the combustion load decreases and the pulverized coal concentration in the air-fuel mixture becomes low, the pulverized coal concentration is concentrated in the flow passage outside the partition tube, and the pulverized coal concentration in the flow passage is kept constant.
Ignition can be stabilized.
【００１３】更に本発明では２次空気流路の先端と３次
空気流路の先端とが混合気流路の先端よりも前方に突出
しており、また上記３次空気流路の先端部は外に開く方
向に向けられているので、２次空気と火炎の接点を遅ら
せて混合気着火前の２次空気の干渉を防ぐことができ、
また３次空気には火炎を包み込むような大きな循環流を
形成させて、ＮＯx 還元領域を広くすることができる。Further, according to the present invention, the tip of the secondary air passage and the tip of the tertiary air passage project forward of the tip of the air-fuel mixture passage, and the tip of the tertiary air passage is outward. Since it is directed to the opening direction, the contact point between the secondary air and flame can be delayed to prevent the interference of the secondary air before ignition of the mixture,
In addition, a large circulation flow that encloses the flame can be formed in the tertiary air to widen the NO x reduction region.
【００１４】[0014]
【実施例】図１は本発明の一実施例を示す縦断側面図，
図２は同じく正面図，図３は図１の III−III 横断面
図，図４は図１のIV−IV矢視断面図，図５は図１のＶ−
Ｖ矢視断面図である。これらの図において、前記図６な
いし図８により説明した従来のものと同様の部分につい
ては、冗長になるのを避けるため、同一の符号を付け詳
しい説明を省く。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional side view showing an embodiment of the present invention,
2 is a front view of the same, FIG. 3 is a transverse sectional view taken along the line III-III of FIG. 1, FIG. 4 is a sectional view taken along the line IV-IV of FIG. 1, and FIG.
FIG. In these drawings, the same parts as those of the conventional one described with reference to FIGS. 6 to 8 are given the same reference numerals to avoid redundancy, and detailed description thereof is omitted.
【００１５】本実施例においては、微粉炭供給管（１
１）が混合気流路（１４）に対して一定の進入角α（４
５°〜９０°）で接線方向に接続されている。そして微
粉炭供給管（１１）の先端部には、上記混合気の進入角
度を制御するために、微粉炭供給管（１１）の内側端面
を軸にしてバーナ横断面内で左右に移動可能なブロック
（２８）が設けられている。In this embodiment, the pulverized coal supply pipe (1
1) is a constant advancing angle α (4
5 ° to 90 °) in the tangential direction. At the tip of the pulverized coal supply pipe (11), the inner end surface of the pulverized coal supply pipe (11) can be moved to the left and right within the cross section of the burner in order to control the advancing angle of the air-fuel mixture. A block (28) is provided.
【００１６】本実施例ではまた、混合気流路（１４）内
を外周部（２６）と内周部（２７）に区画する仕切管
（２５）が設けられている。そして上記外周部、すなわ
ち上記仕切管（２５）と一次空気管（０３）との間の流
路（２６）には、図４に示されるような複数のブロック
状のスプリッタ（２３）が円周方向に配置されている。
また上記内周部、すなわち上記仕切管（２５）とオイル
１次空気管（０２）との間の流路（２７）には、図５に
示されるように、流れを軸線に平行に向ける複数の整流
板（２４）が設けられている。In the present embodiment, a partition pipe (25) is also provided which divides the inside of the air-fuel mixture flow passage (14) into an outer peripheral portion (26) and an inner peripheral portion (27). A plurality of block-shaped splitters (23) as shown in FIG. 4 are circumferentially arranged in the outer peripheral portion, that is, in the flow path (26) between the partition pipe (25) and the primary air pipe (03). Are arranged in the direction.
In the inner peripheral portion, that is, in the flow path (27) between the partition pipe (25) and the primary oil air pipe (02), as shown in FIG. The current plate (24) is provided.
【００１７】更に本実施例では、２次空気流路（１５）
と３次空気流路（１６）の先端を形成する２次空気ノズ
ル（１８）と３次空気ノズル（１９）が、いずれも混合
気流路（１４）の先端を形成する微粉炭ノズル（１７）
よりも前方に突出している。そして、３次空気ノズル
（１９）の先端部外面にダミー耐火材（２１）が設けら
れ、３次空気流路（１６）の先端部が外に開く方向に向
いている。Further, in this embodiment, the secondary air flow path (15)
And the secondary air nozzle (18) and the tertiary air nozzle (19) forming the tip of the tertiary air flow path (16) are both the pulverized coal nozzle (17) forming the tip of the air-fuel mixture flow path (14).
It projects more forward than. Then, a dummy refractory material (21) is provided on the outer surface of the tip of the tertiary air nozzle (19), and the tip of the tertiary air flow path (16) faces the direction of opening to the outside.
【００１８】上記のように本実施例では、微粉炭供給管
（１１）が接線方向に接続されているので、微粉炭と１
次空気の混合気に旋回力が付与され、混合気流路（１
４）の外周部には微粉炭濃度が高い混合気、内周部には
微粉炭濃度が低い混合気を形成し、仕切管（２５）によ
って区画された外周部流路（２６）と内周部流路（２
７）にそれぞれ流入する。また、旋回により周方向の濃
度分布は均一になる。As described above, in this embodiment, since the pulverized coal supply pipe (11) is tangentially connected to the pulverized coal supply pipe (11),
A swirl force is applied to the mixture of the secondary air, and the mixture channel (1
An air-fuel mixture having a high pulverized coal concentration is formed in the outer peripheral portion of 4) and a air-fuel mixture having a low pulverized coal concentration is formed in the inner peripheral portion, and the outer peripheral flow path (26) and the inner peripheral portion are divided by the partition pipe (25) Part flow path (2
Inflow to 7) respectively. Moreover, the concentration distribution in the circumferential direction becomes uniform by the turning.
【００１９】上記混合気が旋回流のまま炉内に噴出する
と、微粉炭火炎が広角に拡がり、３次空気の急激な混合
によりＮＯx が増大するばかりでなく、バーナ配置によ
っては燃焼火炎が炉壁に衝突し、スラッギングあるいは
ＣＯ増大等の問題が発生するから、微粉炭混合気は弱旋
回またはバーナ軸に平行な直進流であることが望まし
い。本実施例では、バーナ先端部の仕切り管（２５）の
外側の流路（２６）に配設されたブロック状のスプリッ
タ（２３）が、濃混合気の旋回流を弱めるとともに、ス
プリッタ（２３）下流面に形成されるカルマン渦により
保炎を強化する役割を果たす。一方、仕切管（２５）の
内側の流路（２７）に設けられた整流板（２４）は、淡
混合気を直進流に変更するもので、淡混合気は濃混合気
火炎からの輻射熱により着火・燃焼する。[0019] When the air-fuel mixture is ejected leaving the furnace of the swirling flow, the pulverized coal flame is spread in a wide angle, not only NO x increases by a sudden mixing of the tertiary air, the furnace combustion flame by the burner arrangement It is desirable that the pulverized coal mixture is a weak swirl or a straight flow parallel to the burner axis because it collides with the wall and causes problems such as slugging or CO increase. In this embodiment, the block-shaped splitter (23) arranged in the flow path (26) outside the partition pipe (25) at the tip of the burner weakens the swirling flow of the rich air-fuel mixture, and at the same time, the splitter (23). The Karman vortex formed on the downstream surface plays a role in strengthening flame holding. On the other hand, the straightening vane (24) provided in the flow path (27) inside the partition pipe (25) changes the lean mixture into a straight flow, and the lean mixture is generated by the radiant heat from the rich mixture flame. Ignite and burn.
【００２０】微粉炭供給（１１）に設置された可動ブロ
ック（２８）は、１次空気と微粉炭の混合気の進入角度
を燃焼負荷に応じて操作することにより、混合気の旋回
力を制御するものである。燃焼負荷が低くなるに伴な
い、ミル風量の制限から微粉炭混合気中の微粉炭濃度は
相対的に低くなり、着火が不安定となる。これに追従し
て可動ブロック（２８）を旋回半径が大きくなる方向に
移動すれば、微粉炭は遠心力により仕切り管（２５）の
外側の流路（２６）に集中し、燃焼負荷が低下しても仕
切管（２５）外側の流路（２６）の微粉炭濃度は一定に
保たれ、安定着火が確保される。The movable block (28) installed in the pulverized coal supply (11) controls the swirling force of the mixture by operating the advancing angle of the mixture of primary air and pulverized coal according to the combustion load. To do. As the combustion load decreases, the pulverized coal concentration in the pulverized coal mixture becomes relatively low due to the limitation of the mill air flow, and ignition becomes unstable. Following this, if the movable block (28) is moved in the direction in which the turning radius increases, the pulverized coal will be concentrated in the flow path (26) outside the partition pipe (25) by the centrifugal force, and the combustion load will decrease. Even so, the pulverized coal concentration in the flow path (26) outside the partition tube (25) is kept constant, and stable ignition is secured.
【００２１】本実施例ではまた、２次空気ノズル（１
８）と３次空気ノズル（１９）を微粉炭ノズル（１７）
よりも前方に配置したので、微粉炭混合気と並行に噴出
する２次空気と火炎の接触が遅くなり、その結果、微粉
炭混合気に着火する前に２次空気が干渉するのを防止す
ることができる。更に本実施例では、３次空気ノズル
（１９）の先端部外面のダミー耐火材（２１）により３
次空気流路（１６）の先端部が外に開く方向に向いてい
るので、３次空気は火炎を包み込むような大きな循環流
を形成し、広範囲にＮＯx 還元領域が形成されて、ＮＯ
x が低減される。In this embodiment, the secondary air nozzle (1
8) and the tertiary air nozzle (19) as pulverized coal nozzle (17)
Since it is placed in front of the pulverized coal mixture, the contact between the secondary air ejected in parallel with the pulverized coal mixture and the flame is delayed, and as a result, the secondary air is prevented from interfering with the pulverized coal mixture before being ignited. be able to. Further, in the present embodiment, the dummy refractory material (21) on the outer surface of the tip of the tertiary air nozzle (19) is used to remove
Since the tip portion of the secondary air flow path (16) faces the direction of opening to the outside, the tertiary air forms a large circulation flow that encloses the flame, and the NO x reduction region is formed in a wide area, so that the NO x reduction region is formed.
x is reduced.
【００２２】仕切管（２５）の外側の流路（濃混合気流
路）（２６）の先端部で円周上に配設されるスプリッタ
（２３）の数は３個以上が望ましい。また、濃混合気流
路（２６）の断面積に対するスプリッタ（２３）の面積
割合は、１５ないし３０％の範囲が望ましい。仕切管
（２５）の内側の流路（淡混合気流路）（２７）に配設
される整流板（２４）は、実施例において平板であり、
その長さは旋回ピッチ以上、また枚数は３枚以上が望ま
しい。The number of splitters (23) arranged on the circumference at the tip of the flow path (concentrated mixture flow path) (26) outside the partition tube (25) is preferably three or more. The area ratio of the splitter (23) to the cross-sectional area of the rich air-fuel mixture flow path (26) is preferably in the range of 15 to 30%. The current plate (24) arranged in the flow path (light mixture flow path) (27) inside the partition tube (25) is a flat plate in the embodiment,
It is desirable that the length is equal to or greater than the turning pitch, and the number is equal to or greater than 3.
【００２３】[0023]
【発明の効果】本発明によれば、軸対称の丸型微粉炭バ
ーナにおいて、旋回力によって微粉炭を濃淡に分離し、
負荷に応じて旋回力を制御する手段と微粉炭ノズル先端
に設けたスプリッタや整流板により、バーナ全周にわた
って均一な着火面と安定着火を得られる。According to the present invention, in an axially symmetric round type pulverized coal burner, pulverized coal is separated into dark and light by a turning force,
A uniform ignition surface and stable ignition can be obtained over the entire circumference of the burner by means of controlling the turning force according to the load and the splitter and straightening plate provided at the tip of the pulverized coal nozzle.
【００２４】また２次空気ノズルおよび３次空気ノズル
の噴出位置と噴出方向を最適化することにより、広範囲
のＮＯx 還元領域を形成させＮＯx を低減できる。Further, by optimizing the ejection position and ejection direction of the secondary air nozzle and the tertiary air nozzle, it is possible to form a wide NO x reduction region and reduce NO x .
【図面の簡単な説明】[Brief description of drawings]
【図１】図１は本発明の一実施例を示す縦断側面図であ
る。FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.
【図２】図２は図１の正面図である。FIG. 2 is a front view of FIG.
【図３】図３は図１の III−III 横断面図である。3 is a cross-sectional view taken along the line III-III in FIG.
【図４】図４は図１のIV−IV矢視断面図である。FIG. 4 is a sectional view taken along the line IV-IV in FIG.
【図５】図５は図１のＶ−Ｖ矢視断面図である。5 is a cross-sectional view taken along the line VV of FIG.
【図６】図６は従来の微粉炭バーナの一例を示す縦断側
面図である。FIG. 6 is a vertical side view showing an example of a conventional pulverized coal burner.
【図７】図７は図６の正面図である。FIG. 7 is a front view of FIG.
【図８】図８は図６のVIII−VIII横断面図である。8 is a cross-sectional view taken along the line VIII-VIII of FIG.
（０１） オイルガン （０２） オイル１次空気管 （０３） １次空気管 （０４） ２次空気管 （０５） 旋回羽根 （０６） 保炎板 （０７） ２次空気旋回羽根 （０８） ３次空気旋回羽根 （０９） 空気風箱側板 （１０） バーナタイル （１１） 微粉炭供給管 （１２） バーナ外筒 （１３） オイル１次空気流路 （１４） 微粉炭混合気流路 （１５） ２次空気流路 （１６） ３次空気流路 （１７） 微粉炭ノズル （１８） ２次空気ノズル （１９） ３次空気ノズル （２１） ダミー耐火材 （２３） スプリッタ（中子） （２４） 整流板 （２５） 仕切管 （２６） 濃混合気流路 （２７） 淡混合気流路 （２８） 可動ブロック (01) Oil gun (02) Oil primary air pipe (03) Primary air pipe (04) Secondary air pipe (05) Swirling blade (06) Flame holding plate (07) Secondary air swirling blade (08) 3 Next air swirl blade (09) Air wind box side plate (10) Burner tile (11) Pulverized coal supply pipe (12) Burner outer cylinder (13) Oil primary air flow path (14) Pulverized coal mixture flow path (15) 2 Secondary air channel (16) Tertiary air channel (17) Pulverized coal nozzle (18) Secondary air nozzle (19) Tertiary air nozzle (21) Dummy refractory material (23) Splitter (core) (24) Rectification Plate (25) Partition pipe (26) Thick mixture channel (27) Light mixture channel (28) Movable block
Claims (1)
と、同オイルガンを囲む環状断面のオイル１次空気流路
と、同オイル１次空気流路を囲む環状断面の微粉炭と１
次空気の混合気流路と、同混合気流路を囲む環状断面の
２次空気流路と、同２次空気流路を囲む環状断面の３次
空気流路とを備え、次の要件（１）ないし（７）を満た
すことを特徴とする微粉炭バーナ。 （１） 上記混合気流路に対して微粉炭供給管が接線方
向に接続されていること。 （２） 上記微粉炭供給管の先端部に上記混合気の進入
角度を制御する手段が設けられていること。 （３） 上記混合気流路内を外周部と内周部に区画する
仕切管が設けられていること。 （４） 上記外周部には複数のブロックが円周方向に配
置されていること。 （５） 上記内周部には流れを軸線に平行に向ける複数
の整流板が設けられていること。 （６） 上記２次空気流路の先端と上記３次空気流路の
先端とは、上記混合気流路の先端よりも前方に突出して
いること。 （７） 上記３次空気流路の先端部は外に開く方向に向
けられていること。1. An oil gun for auxiliary combustion arranged in an axial center portion, an oil primary air passage having an annular cross section surrounding the oil gun, and a pulverized coal having an annular cross section surrounding the oil primary air passage. 1
The following requirements (1) are provided: a mixture channel of secondary air, a secondary air channel of an annular cross section surrounding the mixture channel, and a tertiary air channel of an annular cross section surrounding the secondary air channel. To (7) are satisfied. (1) A pulverized coal supply pipe is tangentially connected to the mixture channel. (2) A means for controlling the advancing angle of the air-fuel mixture is provided at the tip of the pulverized coal supply pipe. (3) A partition tube that partitions the inside of the mixture channel into an outer peripheral portion and an inner peripheral portion is provided. (4) A plurality of blocks are arranged in the circumferential direction on the outer peripheral portion. (5) A plurality of flow straightening plates that direct the flow parallel to the axis are provided on the inner peripheral portion. (6) The tip of the secondary air channel and the tip of the tertiary air channel project forward of the tip of the mixture channel. (7) The tip of the tertiary air flow path should be oriented in the direction of opening to the outside.
Priority Applications (17)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27910294A JP3377626B2 (en) | 1994-11-14 | 1994-11-14 | Pulverized coal burner |
| CA002162244A CA2162244C (en) | 1994-11-14 | 1995-11-06 | Pulverized coal combustion burner |
| EP95117604A EP0711952B1 (en) | 1994-11-14 | 1995-11-08 | Pulverized coal burner |
| ES95117604T ES2163468T3 (en) | 1994-11-14 | 1995-11-08 | PULVERIZED CARBON BURNER. |
| PT95117604T PT711952E (en) | 1994-11-14 | 1995-11-08 | PULVERIZED CARBON COMBUSTION BURNER |
| DK95117604T DK0711952T3 (en) | 1994-11-14 | 1995-11-08 | pulverized coal burner |
| AT95117604T ATE206194T1 (en) | 1994-11-14 | 1995-11-08 | CHARCOAL BURNER |
| DE69522895T DE69522895T2 (en) | 1994-11-14 | 1995-11-08 | Pulverized coal burner |
| US08/556,144 US6116171A (en) | 1994-11-14 | 1995-11-09 | Pulverized coal combustion burner |
| NO954561A NO305453B1 (en) | 1994-11-14 | 1995-11-13 | Burner for combustion of powdered coal |
| HU9503257A HU220145B (en) | 1994-11-14 | 1995-11-13 | Pulverized coal combustion burner |
| FI955462A FI109724B (en) | 1994-11-14 | 1995-11-13 | Incinerator of atomized carbon |
| CZ20021950A CZ293962B6 (en) | 1994-11-14 | 1995-11-14 | Pulverized coal combustion burner |
| CZ19953000A CZ291358B6 (en) | 1994-11-14 | 1995-11-14 | Pulverized coal combustion burner |
| KR1019950041179A KR100201677B1 (en) | 1994-11-14 | 1995-11-14 | Burner for the combustion of pulverised fuel |
| PL95311363A PL179672B1 (en) | 1994-11-14 | 1995-11-14 | Coal dust fired boiler |
| TW084112781A TW289077B (en) | 1994-11-14 | 1995-11-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27910294A JP3377626B2 (en) | 1994-11-14 | 1994-11-14 | Pulverized coal burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08135920A true JPH08135920A (en) | 1996-05-31 |
| JP3377626B2 JP3377626B2 (en) | 2003-02-17 |
Family
ID=17606450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27910294A Expired - Fee Related JP3377626B2 (en) | 1994-11-14 | 1994-11-14 | Pulverized coal burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3377626B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008102420A1 (en) * | 2007-02-19 | 2008-08-28 | Ihi Corporation | Pulverized coal burner |
| CN101832551A (en) * | 2010-06-18 | 2010-09-15 | 上海交通大学 | Adjustable center weak swirl pulverized coal burner |
| US20100307391A1 (en) * | 2008-03-10 | 2010-12-09 | Ihi Corporation | Pulverized fuel burner |
| JP2012107789A (en) * | 2010-11-16 | 2012-06-07 | Ihi Corp | Low volatile fuel burner device |
| JP2012189311A (en) * | 2011-02-21 | 2012-10-04 | Osaka Gas Co Ltd | Combustion device, and method of operating the same |
| WO2018034286A1 (en) * | 2016-08-19 | 2018-02-22 | 三菱日立パワーシステムズ株式会社 | Solid fuel burner |
| CN111425884A (en) * | 2018-12-24 | 2020-07-17 | 上海梅山钢铁股份有限公司 | Method for reducing emission concentration of sulfur dioxide in flue gas of full-combustion gas boiler |
-
1994
- 1994-11-14 JP JP27910294A patent/JP3377626B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008102420A1 (en) * | 2007-02-19 | 2008-08-28 | Ihi Corporation | Pulverized coal burner |
| JP2008202836A (en) * | 2007-02-19 | 2008-09-04 | Ihi Corp | Pulverized coal burner |
| US20100307391A1 (en) * | 2008-03-10 | 2010-12-09 | Ihi Corporation | Pulverized fuel burner |
| CN101832551A (en) * | 2010-06-18 | 2010-09-15 | 上海交通大学 | Adjustable center weak swirl pulverized coal burner |
| JP2012107789A (en) * | 2010-11-16 | 2012-06-07 | Ihi Corp | Low volatile fuel burner device |
| JP2012189311A (en) * | 2011-02-21 | 2012-10-04 | Osaka Gas Co Ltd | Combustion device, and method of operating the same |
| WO2018034286A1 (en) * | 2016-08-19 | 2018-02-22 | 三菱日立パワーシステムズ株式会社 | Solid fuel burner |
| CN111425884A (en) * | 2018-12-24 | 2020-07-17 | 上海梅山钢铁股份有限公司 | Method for reducing emission concentration of sulfur dioxide in flue gas of full-combustion gas boiler |
| CN111425884B (en) * | 2018-12-24 | 2022-04-15 | 上海梅山钢铁股份有限公司 | Method for reducing emission concentration of sulfur dioxide in flue gas of full-combustion gas boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3377626B2 (en) | 2003-02-17 |
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