JPH0360005B2 - - Google Patents
Info
- Publication number
- JPH0360005B2 JPH0360005B2 JP7307585A JP7307585A JPH0360005B2 JP H0360005 B2 JPH0360005 B2 JP H0360005B2 JP 7307585 A JP7307585 A JP 7307585A JP 7307585 A JP7307585 A JP 7307585A JP H0360005 B2 JPH0360005 B2 JP H0360005B2
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- main
- combustion
- boiler
- overfire 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
Links
- 239000003245 coal Substances 0.000 claims description 20
- 238000002485 combustion reaction Methods 0.000 claims description 15
- 239000000446 fuel Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000009841 combustion method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、微粉炭三段燃焼方式によるボイラー
火炉において、このボイラー火炉内への微粉炭及
び空気の供給方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for supplying pulverized coal and air into a boiler furnace using a pulverized coal three-stage combustion method.
従来の技術
ボイラー火炉内で窒素酸化物（以下、NOxと
称す。）を抑制して燃焼させる三段燃焼法を具体
的に行なうための主バーナ、二次燃料ノズル、及
びオーバーフアイヤー空気ノズルの配置は、
NOxの効果的低減、未燃分量の低減効果、及び
火炉容積を考慮して決定する必要がある。従来の
一例である第３図で示す大型ボイラーに採用され
る対向燃焼型の微粉炭燃焼ボイラーは、ボイラー
１０に対して、主バーナ１１と二次燃料ノズル１
２を上下方向に配設し、且つこれら主バーナ１１
と二次燃料ノズル１２とを一対の側壁１０ａ，１
０ｂに相対向させて設けている。これによると、
主バーナ１１，１１の主軸上で対向燃焼が行なわ
れ、旋回火炎１３が炉中央部で激しく衝突して撹
乱されるため、一次燃焼ゾーンである燃焼酸化ゾ
ーンでの主微粉炭C1の燃焼性は極めて良く、ま
た炉内流れも均一型がある。Prior Art Arrangement of a main burner, a secondary fuel nozzle, and an overfire air nozzle for specifically carrying out a three-stage combustion method for suppressing and burning nitrogen oxides (hereinafter referred to as NOx) in a boiler furnace. teeth,
It is necessary to determine the effective reduction of NOx, the effect of reducing the amount of unburned substances, and the furnace volume. The opposed combustion type pulverized coal combustion boiler used in the large boiler shown in FIG.
2 are arranged in the vertical direction, and these main burners 11
and the secondary fuel nozzle 12 are connected to a pair of side walls 10a, 1
It is provided opposite to 0b. according to this,
Opposed combustion takes place on the main shafts of the main burners 11, 11, and the swirling flames 13 collide violently in the center of the furnace and are disturbed, so the combustibility of the main pulverized coal C1 in the combustion oxidation zone, which is the primary combustion zone, is reduced. The flow rate inside the furnace is extremely good, and the flow inside the furnace is also uniform.
発明が解決しようとする問題点
上記した従来方式によると、主バーナ１１の供
給方向と二次燃料ノズル１２の供給方向とが同一
方向であることから、旋回火炎１３のうず流の中
に還元用の二次微粉炭（二次燃料）C2がまきこ
まれ、明確な還元ゾーンの形成ができなかつた。
そのためNOx抑制効果は小さく、また未燃分の
発生量も多かつた。すなわち、例えばワークワー
ス炭でNOxが200ppmと十分に低減できず、また
灰中の未然分量は10％と発生量は増大するなど影
響が多きかつた。Problems to be Solved by the Invention According to the above-described conventional system, since the supply direction of the main burner 11 and the supply direction of the secondary fuel nozzle 12 are the same, the reducing Secondary pulverized coal (secondary fuel) C 2 was mixed in, making it impossible to form a clear reduction zone.
As a result, the NOx suppression effect was small, and a large amount of unburned matter was generated. That is, for example, with Warkworth coal, NOx was 200 ppm, which could not be sufficiently reduced, and the amount of unused material in the ash was 10%, which increased the amount of NOx generated.
問題点を解決するための手段
上記問題点を解決すべく本発明におけるボイラ
ー火炉内への微粉炭及び空気の供給方法は、還元
燃料用の二次微粉炭を、主バーナの後流で且つ主
バーナとは直交する方向に配設した二次燃料ノズ
ルから供給し、そして二次燃料ノズルの後流にお
いて、この二次燃料ノズルと同方向に配設したオ
ーバーフアイヤー空気ノズルからオーバーフアイ
ヤー空気を供給している。Means for Solving the Problems In order to solve the above problems, the method of supplying pulverized coal and air into a boiler furnace according to the present invention supplies secondary pulverized coal for reducing fuel downstream of the main burner and A secondary fuel nozzle is provided perpendicularly to the burner, and overfire air is supplied from an overfire air nozzle located in the same direction as the secondary fuel nozzle. are doing.
作 用
かかる本発明によると、主バーナの流れの影響
から二次燃料の流れを独立させて明確な還元ゾー
ンを形成し得る。Effect According to the present invention, it is possible to form a clear reduction zone by making the flow of the secondary fuel independent from the influence of the flow of the main burner.
実施例
以下に本発明の一実施例である大型ボイラで採
用される対向燃焼型の微粉炭燃焼ボイラを第１
図、第２図に基づいて説明する。１は四角筒状の
ボイラーで、上部には排ガス出口２が設けられ
る。前記ボイラー１の下部において、相対向する
一対の面１ａ，１ａには下段主バーナ３，３が相
対向する状態で配設され、そして後流（上方）に
段差H1を付けて同様で一対の上段主バーナ４，
４が配設される、前記一対の面１ａ，１ａとは直
交する別の一対の面１ｂ，１ｂにおいて、前記上
段主バーナ４，４の上方（後流）に段差H2を付
けて二次燃料ノズル５，５が配設され、そして二
次燃料ノズル５，５の上方（後流）に段差H3を
付けて、同方向に向くオーバーフアイヤー空気ノ
ズル６，６が設けられる。両主バーナ３，４、な
らびに各ノズル５，６は、夫々横方向に複数並設
される。前記ボイラー１内の上部には管群７が複
数段に配設される。A1は主燃燒空気、A2はオー
バーフアイヤー空気、C1は主微粉炭、C2は二次
微粉炭、Ｇは燃焼排ガスを示す。Embodiment The following describes a first example of a pulverized coal combustion boiler of a facing combustion type employed in a large boiler, which is an embodiment of the present invention.
This will be explained based on FIG. 1 is a square cylindrical boiler, and an exhaust gas outlet 2 is provided at the top. In the lower part of the boiler 1, lower stage main burners 3, 3 are arranged in a state of facing each other on a pair of opposing surfaces 1a, 1a, and a pair of similar burners are provided with a step H1 on the wake (upper side). Upper main burner 4,
A step H 2 is provided above (swaft) of the upper stage main burners 4, 4 on another pair of surfaces 1b, 1b orthogonal to the pair of surfaces 1a, 1a, on which the upper stage main burners 4, 4 are disposed. Fuel nozzles 5,5 are arranged, and above (swaft) of the secondary fuel nozzles 5,5, with a step H3 , overfire air nozzles 6,6 pointing in the same direction are provided. A plurality of both main burners 3 and 4 and each nozzle 5 and 6 are arranged in parallel in the horizontal direction. A plurality of tube groups 7 are arranged in the upper part of the boiler 1 in multiple stages. A 1 is main combustion air, A 2 is overfire air, C 1 is main pulverized coal, C 2 is secondary pulverized coal, and G is combustion exhaust gas.
上記実施例では、火炉内において主微粉炭C1
の燃焼酸化ゾーンX1、二次微粉炭C2の吹き込み
還元ゾーンX2、オーバーフアイヤー空気A2の吹
き込みによる低温酸化緩慢燃焼ゾーンX3を完全
に区分し得る。すなわち、主バーナ３，４の主軸
上で対向燃焼が行なわれ、旋回火炎８が炉中央部
で激しく衝突して撹乱されるため、一次燃焼ゾー
ンである燃焼酸化ゾーンX1での主微粉炭C1の燃
焼性は極めて良く、また炉内流れも均一性があ
る。そして後流において直交する方向から二次微
粉炭C2が供給され、この場合に、旋回火炎８の
中央部の主流域に二次微粉炭C2が突入しないよ
うに二次燃料ノズル５をやや両側に片寄らせてお
り、以つて吹き込み還元ゾーンX2を区分し得る。
さらにオーバーフアイヤー空気A2も二次微粉炭
C2と同方向から供給して、流れの均一化をはか
つている。 In the above example, the main pulverized coal C 1 in the furnace
The combustion oxidation zone X1 , the secondary pulverized coal C2 blowing reduction zone X2 , and the low temperature oxidation slow combustion zone X3 by blowing overfire air A2 can be completely divided. That is, since opposing combustion is performed on the main shafts of the main burners 3 and 4, and the swirling flames 8 collide violently in the center of the furnace and are disturbed, the main pulverized coal C in the combustion oxidation zone X 1 which is the primary combustion zone The combustibility of No. 1 is extremely good, and the flow inside the furnace is uniform. Then, the secondary pulverized coal C 2 is supplied from the orthogonal direction in the wake, and in this case, the secondary fuel nozzle 5 is slightly closed to prevent the secondary pulverized coal C 2 from rushing into the main region at the center of the swirling flame 8. It is offset to both sides, and the blowing reduction zone X 2 can be divided.
In addition, overfire air A 2 is also used as secondary pulverized coal.
It is supplied from the same direction as C 2 to ensure uniform flow.
発明の効果
上記構成の本発明方法によると、主バーナの流
れの影響から二次燃料の流れを独立させて明確な
還元ゾーンを形成することができ、例えばワーク
ワース炭でNOx150ppm以下、灰中の未然分量５
％以下と、NOx低減効果の増大と未燃分の減少
効果を著しく改善できる。Effects of the Invention According to the method of the present invention having the above configuration, it is possible to form a clear reduction zone by making the flow of the secondary fuel independent from the influence of the flow of the main burner. Unexpired amount 5
% or less, it is possible to significantly improve the NOx reduction effect and the unburned content reduction effect.
第１図、第２図は本発明の一実施例を示し、第
１図は縦断面図、第２図は第１図における−
断面図、第３図は従来例を示す要部の縦断面図で
ある。
１……ボイラー、１ａ……一対の面、１ｂ……
別の一対の面、３……下段主バーナ、４……上段
主バーナ、５……二次燃料ノズル、６……オーバ
ーフアイヤー空気ノズル、A2……オーバーフア
イヤー空気、C1……主微粉炭、C2……二次微粉
炭。
1 and 2 show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view, and FIG. 2 is a -
3 is a longitudinal sectional view of the main part of a conventional example. 1...boiler, 1a...pair of surfaces, 1b...
Another pair of surfaces, 3...lower main burner, 4...upper main burner, 5...secondary fuel nozzle, 6...overfire air nozzle, A2 ...overfire air, C1 ...main fine powder Charcoal, C 2 ... Secondary pulverized coal.
Claims (1)
で且つ主バーナとは直交する方向に配設した二次
燃料ノズルから供給し、そして二次燃料ノズルの
後流において、この二次燃料ノズルと同方向に配
設したオーバーフアイヤー空気ノズルからオーバ
ーフアイヤー空気を供給することを特徴とするボ
イラー火炉内への微粉炭及び空気の供給方法。1. Secondary pulverized coal for reduction combustion is supplied from a secondary fuel nozzle disposed downstream of the main burner and in a direction perpendicular to the main burner, and A method for supplying pulverized coal and air into a boiler furnace, characterized by supplying overfire air from an overfire air nozzle arranged in the same direction as a fuel nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7307585A JPS61231314A (en) | 1985-04-05 | 1985-04-05 | Method of feeding pulverized coal and air into boiler furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7307585A JPS61231314A (en) | 1985-04-05 | 1985-04-05 | Method of feeding pulverized coal and air into boiler furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61231314A JPS61231314A (en) | 1986-10-15 |
| JPH0360005B2 true JPH0360005B2 (en) | 1991-09-12 |
Family
ID=13507844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7307585A Granted JPS61231314A (en) | 1985-04-05 | 1985-04-05 | Method of feeding pulverized coal and air into boiler furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61231314A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06100427B2 (en) * | 1989-01-20 | 1994-12-12 | 川崎製鉄株式会社 | NOx reduction method for plasma heating furnace |
-
1985
- 1985-04-05 JP JP7307585A patent/JPS61231314A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61231314A (en) | 1986-10-15 |
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