JPS60245907A - Three-stage burner - Google Patents
Three-stage burnerInfo
- Publication number
- JPS60245907A JPS60245907A JP59103317A JP10331784A JPS60245907A JP S60245907 A JPS60245907 A JP S60245907A JP 59103317 A JP59103317 A JP 59103317A JP 10331784 A JP10331784 A JP 10331784A JP S60245907 A JPS60245907 A JP S60245907A
- Authority
- JP
- Japan
- Prior art keywords
- combustion
- supply nozzle
- secondary fuel
- exhaust gas
- nozzle
- 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
【発明の詳細な説明】 産業上の利用分野 本発明は三段燃焼装置に関するものである。[Detailed description of the invention] Industrial applications The present invention relates to a three-stage combustion device.
従来例の構成とその問題点
第1図に従来の三段燃焼装置を示す。図において、(1
)は炉壁、(2)はこの炉壁(1)に設けられた一次燃
焼バーナ、(3)は−次燃焼バーナ(2)の上方に位置
して炉壁(1)に設けられた二次燃料供給ノズル、(4
)は二次燃料供給ノズル(3)よりさらに上方に位置し
て炉壁(1)に股、けられた追加空気供給ノズル(0,
F、A)である。−次燃焼バーナ(2)は、軸心部に設
けられた油管(5)と、油管(5)の外周部に設けられ
たコアエア供給ノズル(6)と、コアエア供給ノズル(
6)の外周部に設けられた一次燃料供給ノズル(7)と
、−次燃料供給ノズル(7)の外周部に設けられた二次
空気供給ノズル(8)とを備えており、周囲から二次空
気を供給されて一次燃焼を行う構成とされている。そし
て、−次燃焼バーナ(2)の−次燃料供給ノズル(7)
と前記二次燃料供給ノズル(3)には分配器(9)を通
して微粉炭とその気送空気が分配供給される構成とされ
ている。Conventional structure and its problems FIG. 1 shows a conventional three-stage combustion device. In the figure, (1
) is the furnace wall, (2) is the primary combustion burner installed on the furnace wall (1), and (3) is the secondary combustion burner located above the secondary combustion burner (2) and installed on the furnace wall (1). Next fuel supply nozzle, (4
) is located further above the secondary fuel supply nozzle (3) and is an additional air supply nozzle (0,
F, A). - The secondary combustion burner (2) includes an oil pipe (5) provided at the axial center, a core air supply nozzle (6) provided at the outer periphery of the oil pipe (5), and a core air supply nozzle (
6), and a secondary air supply nozzle (8) provided on the outer periphery of the secondary fuel supply nozzle (7). The structure is such that primary air is supplied to perform primary combustion. and the secondary fuel supply nozzle (7) of the secondary combustion burner (2).
The pulverized coal and its pneumatic air are distributed and supplied to the secondary fuel supply nozzle (3) through a distributor (9).
このような構成で、先ず一次燃焼バーナ(2)により一
次燃焼を行う場合、通常、火炎の安定のために、微粉炭
気送空気の噴出流速よりも高い速度で二次空気が二次空
気供給ノズル(8)から噴出される。そうすると、二次
空気供給ノズル(8)の環状噴出口の内側に負圧域が形
成され、こ三に高温燃焼ガスが誘引されることになる。In such a configuration, when primary combustion is first performed by the primary combustion burner (2), the secondary air is normally supplied at a higher speed than the ejection flow rate of the pulverized coal pneumatic air in order to stabilize the flame. It is ejected from the nozzle (8). Then, a negative pressure region is formed inside the annular jet nozzle of the secondary air supply nozzle (8), and high-temperature combustion gas is attracted thereto.
これにより、微粉炭の早期着火が促され、火炎は安定す
る。そこで、−次燃焼域の後流側に二次燃料供給ノズル
(7)から二次微粉炭が追加供給され、還元雰囲気燃焼
(二次燃焼)が行われる。そして、この後流側に追加空
気供給ノズル(4)から完全燃焼用の空気が供給され、
完全燃焼(三段燃焼)が行われる。This promotes early ignition of the pulverized coal and stabilizes the flame. Therefore, secondary pulverized coal is additionally supplied from the secondary fuel supply nozzle (7) to the downstream side of the secondary combustion area, and reducing atmosphere combustion (secondary combustion) is performed. Then, air for complete combustion is supplied to this downstream side from the additional air supply nozzle (4),
Complete combustion (three-stage combustion) takes place.
ところで、従来、燃焼に必要な空気の供給は主として二
次空気の増減によって調節される。このため、燃焼量が
多い場合は、二次空気流速が著しく増すことになるので
、度合を増した負圧域に一次微粉炭が大量に吸引され、
−次微粉炭と二次機゛粉炭の流量比が変化するという問
題があった。Incidentally, conventionally, the supply of air necessary for combustion is mainly adjusted by increasing or decreasing secondary air. For this reason, when the amount of combustion is large, the secondary air flow rate increases significantly, and a large amount of primary pulverized coal is sucked into the increasingly negative pressure area.
There was a problem in that the flow rate ratio of secondary pulverized coal and secondary pulverized coal changed.
第2図はこの現象を表わしたものである。すなわち、従
来装置によると、燃焼負荷が大きければ大きい程、二次
微粉炭の流量比が低下する傾向にあるため、NOXを良
好に抑制できない場合があるという問題があった。Figure 2 shows this phenomenon. That is, according to the conventional device, the flow rate ratio of secondary pulverized coal tends to decrease as the combustion load increases, so there is a problem that NOx may not be suppressed satisfactorily.
発明の目的
本発明は上記従来の問題を解消する三段燃焼装置を提供
することを目的とする。OBJECTS OF THE INVENTION It is an object of the present invention to provide a three-stage combustion device that solves the above-mentioned conventional problems.
発明の構成
上記目的を達成するため、本発明の三段燃焼装置は、周
囲から二次空気を供給されて燃焼を行う二次燃焼バーナ
によって形成される一次燃焼域の後流側に二次燃料供給
ノズルから二次燃料を追加供給して還元雰囲気燃焼させ
、この後流側に追加空気供給ノズルから完全燃焼用の空
気を供給して完全燃焼を行うとともに、前記−次燃焼バ
ーナと二次燃料供給ノズルに微粉炭を分配器を通して分
配供給する構成の三段燃焼装置において、前記二次燃料
供給ノズルの外周部に、燃焼排ガスを該二次燃料供給ノ
ズルの周囲から炉内に向けて高速で吹込む排ガス吹込ノ
ズルを設ける構成としたものであり、これにより、常に
一定の二次燃料比を得ることができ、良好なNOxを抑
制燃焼を行うことができるものである。Structure of the Invention In order to achieve the above object, the three-stage combustion device of the present invention provides a three-stage combustion device that provides secondary fuel on the downstream side of a primary combustion area formed by a secondary combustion burner that is supplied with secondary air from the surroundings and performs combustion. Secondary fuel is additionally supplied from the supply nozzle to cause combustion in a reducing atmosphere, and air for complete combustion is supplied from the additional air supply nozzle to the downstream side to perform complete combustion. In a three-stage combustion device configured to distribute and supply pulverized coal to a supply nozzle through a distributor, combustion exhaust gas is directed toward the outer periphery of the secondary fuel supply nozzle from around the secondary fuel supply nozzle into the furnace at high speed. This configuration is provided with an exhaust gas blowing nozzle, which makes it possible to always obtain a constant secondary fuel ratio and perform combustion with good NOx suppression.
実施例と作用
以下、本発明の一実施例を第3図に基づ(Xで説明する
。なお、第1図と同一構成のものは同一番号を付して説
明を省略する。Embodiment and Function An embodiment of the present invention will be described below with reference to FIG. 3 (denoted by X. Components having the same configuration as in FIG. 1 will be designated by the same numerals and their explanation will be omitted).
図において、(10)は二次燃料供給ノズル(3)の外
周部に設けられた排ガス吹込ノズルで、循環ブロワ(図
示せず)により本装置の燃焼排ガスを供給され、二次燃
料供給ノズル(3)の周囲からこの燃焼排ガスを炉内に
向けて高速で吹込む働きをなすものである。(11)は
燃焼排ガスの流量調節弁である。その他の構成は、第1
図と同じである。In the figure, (10) is an exhaust gas blowing nozzle provided on the outer periphery of the secondary fuel supply nozzle (3), which is supplied with the combustion exhaust gas of this device by a circulation blower (not shown). 3) The function is to blow this combustion exhaust gas into the furnace from around it at high speed. (11) is a combustion exhaust gas flow control valve. Other configurations are the first
Same as the figure.
このような構成で、前述と同様の手順で三段燃焼を行う
が、燃焼負荷が高く二次空気流速が大きい場合は、排ガ
ス吹込ノズル(10)への燃焼排ガス供給量を増して二
次燃料供給ノズル(3)の吸引力を増し、二次燃料比を
一定に保つ。また、−次燃焼バーナ(2)の−次燃料供
給ノズル(7)と二次燃料供給ノズル(3)とのヘッド
差によって微粉炭流量比が変動する場合も、排ガス吹込
ノズル(10)への燃焼排ガス供給量を調節して、その
影響を無くす。With this configuration, three-stage combustion is performed using the same procedure as described above, but when the combustion load is high and the secondary air flow rate is high, the amount of combustion exhaust gas supplied to the exhaust gas blowing nozzle (10) is increased to supply secondary fuel. Increase the suction power of the supply nozzle (3) and keep the secondary fuel ratio constant. Also, when the pulverized coal flow rate ratio changes due to the head difference between the secondary fuel supply nozzle (7) and the secondary fuel supply nozzle (3) of the secondary combustion burner (2), the exhaust gas injection nozzle (10) Adjust the amount of combustion exhaust gas supplied to eliminate this effect.
すなわち、圧力差を無くす。これにより、負荷やヘッド
差があっても、常に一定の二次燃料比(すなわち、第2
図中の破線)を得ることができる。In other words, the pressure difference is eliminated. This ensures that the secondary fuel ratio (i.e. the secondary
(dashed line in the figure) can be obtained.
発明の効果
以上本発明によれば、常に一定の二次燃料比を得ること
ができ、良好なNOXを抑制燃焼を行うことができる。Effects of the Invention According to the present invention, a constant secondary fuel ratio can always be obtained, and combustion can be performed with good NOx suppression.
第1図は従来の三段燃焼装置の要部縦断面図、第2図は
従来の三段燃焼装置における負荷と二次燃料比の関係に
表す図、第3図は本発明に係る三段燃焼装置の要部縦断
面図である。
(2)・・ −次燃焼バーナ、(3)・・・二次燃料供
給ノズル、(4)・・・追加空気供給ノズル、(9)・
・・分配器、(10)・・・排ガス吹込ノズル
代理人 森 本 義 弘
第1図
第2図
二次J然判しヒF21荷りの間イ系Fig. 1 is a vertical sectional view of the main part of a conventional three-stage combustion device, Fig. 2 is a diagram showing the relationship between load and secondary fuel ratio in the conventional three-stage combustion device, and Fig. 3 is a three-stage combustion device according to the present invention. FIG. 2 is a vertical cross-sectional view of a main part of the combustion device. (2)...-Secondary combustion burner, (3)...Secondary fuel supply nozzle, (4)...Additional air supply nozzle, (9)...
...Distributor, (10)...Exhaust gas blowing nozzle agent Yoshihiro Morimoto Figure 1 Figure 2 2nd J-Jenjihi F21 loading room A system
Claims (1)
バーナによって形成される一次燃焼域の後流側に二次燃
料供給ノズルから二次燃料を追加供給して還元雰囲気燃
焼させ、この後流側に追加供給ノズルから完全燃焼用の
空気を供給して完全燃焼を行うとともに、前記−次燃焼
バーナと二次燃料供給ノズルに微粉炭を分配器を通して
分配供給する構成の三段燃焼装置において、前記二次燃
料供給ノズルの外周部に、燃焼排ガスを該二次燃料供給
ノズルの周囲から炉内に向けて高速で吹き込む排ガス吹
込ノズルを設゛けたことを特徴とする三段燃焼装置。1. Secondary fuel is additionally supplied from the secondary fuel supply nozzle to the downstream side of the primary combustion area formed by the primary combustion burner, which is supplied with secondary air from the surroundings and performs combustion, and combustion is performed in a reducing atmosphere. In a three-stage combustion device configured to perform complete combustion by supplying air for complete combustion from an additional supply nozzle to the upstream side, and to distribute pulverized coal to the secondary combustion burner and the secondary fuel supply nozzle through a distributor. A three-stage combustion device, characterized in that an exhaust gas blowing nozzle is provided on the outer periphery of the secondary fuel supply nozzle for blowing combustion exhaust gas from around the secondary fuel supply nozzle into the furnace at high speed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59103317A JPS60245907A (en) | 1984-05-21 | 1984-05-21 | Three-stage burner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59103317A JPS60245907A (en) | 1984-05-21 | 1984-05-21 | Three-stage burner |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60245907A true JPS60245907A (en) | 1985-12-05 |
JPH0328641B2 JPH0328641B2 (en) | 1991-04-19 |
Family
ID=14350820
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP59103317A Granted JPS60245907A (en) | 1984-05-21 | 1984-05-21 | Three-stage burner |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60245907A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101048034B1 (en) * | 2008-07-04 | 2011-07-08 | 아세아시멘트주식회사 | Burner device for cement kiln |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5737606A (en) * | 1980-08-19 | 1982-03-02 | Hitachi Zosen Corp | Combustion equipment for pulverized fuel |
JPS57204706A (en) * | 1981-06-09 | 1982-12-15 | Babcock Hitachi Kk | Combusting method of preventing corrosion and blockade of air preheater |
JPS5834025A (en) * | 1981-08-20 | 1983-02-28 | Tokyo Electric Power Co Inc:The | Removal of nitrogen oxides in exhaust gas |
JPS58198606A (en) * | 1982-05-14 | 1983-11-18 | Hitachi Ltd | Low nox combustion of powdered coal |
-
1984
- 1984-05-21 JP JP59103317A patent/JPS60245907A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5737606A (en) * | 1980-08-19 | 1982-03-02 | Hitachi Zosen Corp | Combustion equipment for pulverized fuel |
JPS57204706A (en) * | 1981-06-09 | 1982-12-15 | Babcock Hitachi Kk | Combusting method of preventing corrosion and blockade of air preheater |
JPS5834025A (en) * | 1981-08-20 | 1983-02-28 | Tokyo Electric Power Co Inc:The | Removal of nitrogen oxides in exhaust gas |
JPS58198606A (en) * | 1982-05-14 | 1983-11-18 | Hitachi Ltd | Low nox combustion of powdered coal |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101048034B1 (en) * | 2008-07-04 | 2011-07-08 | 아세아시멘트주식회사 | Burner device for cement kiln |
Also Published As
Publication number | Publication date |
---|---|
JPH0328641B2 (en) | 1991-04-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |